--- /dev/null
+//-------------------------------------------------------------------------------------
+// BC6HBC7.cpp
+//
+// Block-compression (BC) functionality for BC6H and BC7 (DirectX 11 texture compression)
+//
+// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
+// ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
+// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
+// PARTICULAR PURPOSE.
+//
+// Copyright (c) Microsoft Corporation. All rights reserved.
+//
+// http://go.microsoft.com/fwlink/?LinkId=248926
+//-------------------------------------------------------------------------------------
+
+#include "DirectXTexP.h"
+
+#include "BC.h"
+
+#ifndef USE_XNAMATH
+using namespace DirectX::PackedVector;
+#endif
+
+namespace DirectX
+{
+
+//-------------------------------------------------------------------------------------
+// Constants
+//-------------------------------------------------------------------------------------
+
+static const float fEpsilon = (0.25f / 64.0f) * (0.25f / 64.0f);
+static const float pC3[] = { 2.0f/2.0f, 1.0f/2.0f, 0.0f/2.0f };
+static const float pD3[] = { 0.0f/2.0f, 1.0f/2.0f, 2.0f/2.0f };
+static const float pC4[] = { 3.0f/3.0f, 2.0f/3.0f, 1.0f/3.0f, 0.0f/3.0f };
+static const float pD4[] = { 0.0f/3.0f, 1.0f/3.0f, 2.0f/3.0f, 3.0f/3.0f };
+
+const int g_aWeights2[] = {0, 21, 43, 64};
+const int g_aWeights3[] = {0, 9, 18, 27, 37, 46, 55, 64};
+const int g_aWeights4[] = {0, 4, 9, 13, 17, 21, 26, 30, 34, 38, 43, 47, 51, 55, 60, 64};
+
+// Partition, Shape, Pixel (index into 4x4 block)
+static const uint8_t g_aPartitionTable[3][64][16] =
+{
+ { // 1 Region case has no subsets (all 0)
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
+ },
+
+ { // BC6H/BC7 Partition Set for 2 Subsets
+ { 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1 }, // Shape 0
+ { 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1 }, // Shape 1
+ { 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1 }, // Shape 2
+ { 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 1, 1, 1 }, // Shape 3
+ { 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1, 1 }, // Shape 4
+ { 0, 0, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1 }, // Shape 5
+ { 0, 0, 0, 1, 0, 0, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1 }, // Shape 6
+ { 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 0, 1, 1, 1 }, // Shape 7
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1 }, // Shape 8
+ { 0, 0, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 }, // Shape 9
+ { 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1 }, // Shape 10
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 1 }, // Shape 11
+ { 0, 0, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 }, // Shape 12
+ { 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1 }, // Shape 13
+ { 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 }, // Shape 14
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1 }, // Shape 15
+ { 0, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 0, 1, 1, 1, 1 }, // Shape 16
+ { 0, 1, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0 }, // Shape 17
+ { 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 0 }, // Shape 18
+ { 0, 1, 1, 1, 0, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0 }, // Shape 19
+ { 0, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0 }, // Shape 20
+ { 0, 0, 0, 0, 1, 0, 0, 0, 1, 1, 0, 0, 1, 1, 1, 0 }, // Shape 21
+ { 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 1, 0, 0 }, // Shape 22
+ { 0, 1, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 0, 1 }, // Shape 23
+ { 0, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0 }, // Shape 24
+ { 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 1, 0, 0 }, // Shape 25
+ { 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0 }, // Shape 26
+ { 0, 0, 1, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 1, 0, 0 }, // Shape 27
+ { 0, 0, 0, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0, 0 }, // Shape 28
+ { 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0 }, // Shape 29
+ { 0, 1, 1, 1, 0, 0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 0 }, // Shape 30
+ { 0, 0, 1, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 1, 0, 0 }, // Shape 31
+
+ // BC7 Partition Set for 2 Subsets (second-half)
+ { 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1 }, // Shape 32
+ { 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1 }, // Shape 33
+ { 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0 }, // Shape 34
+ { 0, 0, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 0, 0 }, // Shape 35
+ { 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0 }, // Shape 36
+ { 0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0 }, // Shape 37
+ { 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1 }, // Shape 38
+ { 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 0, 1, 0, 1 }, // Shape 39
+ { 0, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 0 }, // Shape 40
+ { 0, 0, 0, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1, 0, 0, 0 }, // Shape 41
+ { 0, 0, 1, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 1, 0, 0 }, // Shape 42
+ { 0, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 0, 0 }, // Shape 43
+ { 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0 }, // Shape 44
+ { 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 0, 0, 0, 0, 1, 1 }, // Shape 45
+ { 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1 }, // Shape 46
+ { 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 0, 0, 0 }, // Shape 47
+ { 0, 1, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0 }, // Shape 48
+ { 0, 0, 1, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0 }, // Shape 49
+ { 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 0, 0, 1, 0 }, // Shape 50
+ { 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0 }, // Shape 51
+ { 0, 1, 1, 0, 1, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 1 }, // Shape 52
+ { 0, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 0, 1, 0, 0, 1 }, // Shape 53
+ { 0, 1, 1, 0, 0, 0, 1, 1, 1, 0, 0, 1, 1, 1, 0, 0 }, // Shape 54
+ { 0, 0, 1, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 1, 1, 0 }, // Shape 55
+ { 0, 1, 1, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 0, 0, 1 }, // Shape 56
+ { 0, 1, 1, 0, 0, 0, 1, 1, 0, 0, 1, 1, 1, 0, 0, 1 }, // Shape 57
+ { 0, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1 }, // Shape 58
+ { 0, 0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 0, 0, 1, 1, 1 }, // Shape 59
+ { 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1 }, // Shape 60
+ { 0, 0, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0 }, // Shape 61
+ { 0, 0, 1, 0, 0, 0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0 }, // Shape 62
+ { 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 0, 1, 1, 1 } // Shape 63
+ },
+
+ { // BC7 Partition Set for 3 Subsets
+ { 0, 0, 1, 1, 0, 0, 1, 1, 0, 2, 2, 1, 2, 2, 2, 2 }, // Shape 0
+ { 0, 0, 0, 1, 0, 0, 1, 1, 2, 2, 1, 1, 2, 2, 2, 1 }, // Shape 1
+ { 0, 0, 0, 0, 2, 0, 0, 1, 2, 2, 1, 1, 2, 2, 1, 1 }, // Shape 2
+ { 0, 2, 2, 2, 0, 0, 2, 2, 0, 0, 1, 1, 0, 1, 1, 1 }, // Shape 3
+ { 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 2, 1, 1, 2, 2 }, // Shape 4
+ { 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 2, 2, 0, 0, 2, 2 }, // Shape 5
+ { 0, 0, 2, 2, 0, 0, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1 }, // Shape 6
+ { 0, 0, 1, 1, 0, 0, 1, 1, 2, 2, 1, 1, 2, 2, 1, 1 }, // Shape 7
+ { 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2 }, // Shape 8
+ { 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2 }, // Shape 9
+ { 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2 }, // Shape 10
+ { 0, 0, 1, 2, 0, 0, 1, 2, 0, 0, 1, 2, 0, 0, 1, 2 }, // Shape 11
+ { 0, 1, 1, 2, 0, 1, 1, 2, 0, 1, 1, 2, 0, 1, 1, 2 }, // Shape 12
+ { 0, 1, 2, 2, 0, 1, 2, 2, 0, 1, 2, 2, 0, 1, 2, 2 }, // Shape 13
+ { 0, 0, 1, 1, 0, 1, 1, 2, 1, 1, 2, 2, 1, 2, 2, 2 }, // Shape 14
+ { 0, 0, 1, 1, 2, 0, 0, 1, 2, 2, 0, 0, 2, 2, 2, 0 }, // Shape 15
+ { 0, 0, 0, 1, 0, 0, 1, 1, 0, 1, 1, 2, 1, 1, 2, 2 }, // Shape 16
+ { 0, 1, 1, 1, 0, 0, 1, 1, 2, 0, 0, 1, 2, 2, 0, 0 }, // Shape 17
+ { 0, 0, 0, 0, 1, 1, 2, 2, 1, 1, 2, 2, 1, 1, 2, 2 }, // Shape 18
+ { 0, 0, 2, 2, 0, 0, 2, 2, 0, 0, 2, 2, 1, 1, 1, 1 }, // Shape 19
+ { 0, 1, 1, 1, 0, 1, 1, 1, 0, 2, 2, 2, 0, 2, 2, 2 }, // Shape 20
+ { 0, 0, 0, 1, 0, 0, 0, 1, 2, 2, 2, 1, 2, 2, 2, 1 }, // Shape 21
+ { 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 2, 2, 0, 1, 2, 2 }, // Shape 22
+ { 0, 0, 0, 0, 1, 1, 0, 0, 2, 2, 1, 0, 2, 2, 1, 0 }, // Shape 23
+ { 0, 1, 2, 2, 0, 1, 2, 2, 0, 0, 1, 1, 0, 0, 0, 0 }, // Shape 24
+ { 0, 0, 1, 2, 0, 0, 1, 2, 1, 1, 2, 2, 2, 2, 2, 2 }, // Shape 25
+ { 0, 1, 1, 0, 1, 2, 2, 1, 1, 2, 2, 1, 0, 1, 1, 0 }, // Shape 26
+ { 0, 0, 0, 0, 0, 1, 1, 0, 1, 2, 2, 1, 1, 2, 2, 1 }, // Shape 27
+ { 0, 0, 2, 2, 1, 1, 0, 2, 1, 1, 0, 2, 0, 0, 2, 2 }, // Shape 28
+ { 0, 1, 1, 0, 0, 1, 1, 0, 2, 0, 0, 2, 2, 2, 2, 2 }, // Shape 29
+ { 0, 0, 1, 1, 0, 1, 2, 2, 0, 1, 2, 2, 0, 0, 1, 1 }, // Shape 30
+ { 0, 0, 0, 0, 2, 0, 0, 0, 2, 2, 1, 1, 2, 2, 2, 1 }, // Shape 31
+ { 0, 0, 0, 0, 0, 0, 0, 2, 1, 1, 2, 2, 1, 2, 2, 2 }, // Shape 32
+ { 0, 2, 2, 2, 0, 0, 2, 2, 0, 0, 1, 2, 0, 0, 1, 1 }, // Shape 33
+ { 0, 0, 1, 1, 0, 0, 1, 2, 0, 0, 2, 2, 0, 2, 2, 2 }, // Shape 34
+ { 0, 1, 2, 0, 0, 1, 2, 0, 0, 1, 2, 0, 0, 1, 2, 0 }, // Shape 35
+ { 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 0, 0, 0, 0 }, // Shape 36
+ { 0, 1, 2, 0, 1, 2, 0, 1, 2, 0, 1, 2, 0, 1, 2, 0 }, // Shape 37
+ { 0, 1, 2, 0, 2, 0, 1, 2, 1, 2, 0, 1, 0, 1, 2, 0 }, // Shape 38
+ { 0, 0, 1, 1, 2, 2, 0, 0, 1, 1, 2, 2, 0, 0, 1, 1 }, // Shape 39
+ { 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 0, 0, 0, 0, 1, 1 }, // Shape 40
+ { 0, 1, 0, 1, 0, 1, 0, 1, 2, 2, 2, 2, 2, 2, 2, 2 }, // Shape 41
+ { 0, 0, 0, 0, 0, 0, 0, 0, 2, 1, 2, 1, 2, 1, 2, 1 }, // Shape 42
+ { 0, 0, 2, 2, 1, 1, 2, 2, 0, 0, 2, 2, 1, 1, 2, 2 }, // Shape 43
+ { 0, 0, 2, 2, 0, 0, 1, 1, 0, 0, 2, 2, 0, 0, 1, 1 }, // Shape 44
+ { 0, 2, 2, 0, 1, 2, 2, 1, 0, 2, 2, 0, 1, 2, 2, 1 }, // Shape 45
+ { 0, 1, 0, 1, 2, 2, 2, 2, 2, 2, 2, 2, 0, 1, 0, 1 }, // Shape 46
+ { 0, 0, 0, 0, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1 }, // Shape 47
+ { 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 2, 2, 2, 2 }, // Shape 48
+ { 0, 2, 2, 2, 0, 1, 1, 1, 0, 2, 2, 2, 0, 1, 1, 1 }, // Shape 49
+ { 0, 0, 0, 2, 1, 1, 1, 2, 0, 0, 0, 2, 1, 1, 1, 2 }, // Shape 50
+ { 0, 0, 0, 0, 2, 1, 1, 2, 2, 1, 1, 2, 2, 1, 1, 2 }, // Shape 51
+ { 0, 2, 2, 2, 0, 1, 1, 1, 0, 1, 1, 1, 0, 2, 2, 2 }, // Shape 52
+ { 0, 0, 0, 2, 1, 1, 1, 2, 1, 1, 1, 2, 0, 0, 0, 2 }, // Shape 53
+ { 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 2, 2, 2, 2 }, // Shape 54
+ { 0, 0, 0, 0, 0, 0, 0, 0, 2, 1, 1, 2, 2, 1, 1, 2 }, // Shape 55
+ { 0, 1, 1, 0, 0, 1, 1, 0, 2, 2, 2, 2, 2, 2, 2, 2 }, // Shape 56
+ { 0, 0, 2, 2, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 2, 2 }, // Shape 57
+ { 0, 0, 2, 2, 1, 1, 2, 2, 1, 1, 2, 2, 0, 0, 2, 2 }, // Shape 58
+ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 1, 1, 2 }, // Shape 59
+ { 0, 0, 0, 2, 0, 0, 0, 1, 0, 0, 0, 2, 0, 0, 0, 1 }, // Shape 60
+ { 0, 2, 2, 2, 1, 2, 2, 2, 0, 2, 2, 2, 1, 2, 2, 2 }, // Shape 61
+ { 0, 1, 0, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2 }, // Shape 62
+ { 0, 1, 1, 1, 2, 0, 1, 1, 2, 2, 0, 1, 2, 2, 2, 0 } // Shape 63
+ }
+};
+
+// Partition, Shape, Fixup
+static const uint8_t g_aFixUp[3][64][3] =
+{
+ { // No fix-ups for 1st subset for BC6H or BC7
+ { 0, 0, 0}, { 0, 0, 0}, { 0, 0, 0}, { 0, 0, 0},
+ { 0, 0, 0}, { 0, 0, 0}, { 0, 0, 0}, { 0, 0, 0},
+ { 0, 0, 0}, { 0, 0, 0}, { 0, 0, 0}, { 0, 0, 0},
+ { 0, 0, 0}, { 0, 0, 0}, { 0, 0, 0}, { 0, 0, 0},
+ { 0, 0, 0}, { 0, 0, 0}, { 0, 0, 0}, { 0, 0, 0},
+ { 0, 0, 0}, { 0, 0, 0}, { 0, 0, 0}, { 0, 0, 0},
+ { 0, 0, 0}, { 0, 0, 0}, { 0, 0, 0}, { 0, 0, 0},
+ { 0, 0, 0}, { 0, 0, 0}, { 0, 0, 0}, { 0, 0, 0},
+ { 0, 0, 0}, { 0, 0, 0}, { 0, 0, 0}, { 0, 0, 0},
+ { 0, 0, 0}, { 0, 0, 0}, { 0, 0, 0}, { 0, 0, 0},
+ { 0, 0, 0}, { 0, 0, 0}, { 0, 0, 0}, { 0, 0, 0},
+ { 0, 0, 0}, { 0, 0, 0}, { 0, 0, 0}, { 0, 0, 0},
+ { 0, 0, 0}, { 0, 0, 0}, { 0, 0, 0}, { 0, 0, 0},
+ { 0, 0, 0}, { 0, 0, 0}, { 0, 0, 0}, { 0, 0, 0},
+ { 0, 0, 0}, { 0, 0, 0}, { 0, 0, 0}, { 0, 0, 0},
+ { 0, 0, 0}, { 0, 0, 0}, { 0, 0, 0}, { 0, 0, 0}
+ },
+
+ { // BC6H/BC7 Partition Set Fixups for 2 Subsets
+ { 0,15, 0}, { 0,15, 0}, { 0,15, 0}, { 0,15, 0},
+ { 0,15, 0}, { 0,15, 0}, { 0,15, 0}, { 0,15, 0},
+ { 0,15, 0}, { 0,15, 0}, { 0,15, 0}, { 0,15, 0},
+ { 0,15, 0}, { 0,15, 0}, { 0,15, 0}, { 0,15, 0},
+ { 0,15, 0}, { 0, 2, 0}, { 0, 8, 0}, { 0, 2, 0},
+ { 0, 2, 0}, { 0, 8, 0}, { 0, 8, 0}, { 0,15, 0},
+ { 0, 2, 0}, { 0, 8, 0}, { 0, 2, 0}, { 0, 2, 0},
+ { 0, 8, 0}, { 0, 8, 0}, { 0, 2, 0}, { 0, 2, 0},
+
+ // BC7 Partition Set Fixups for 2 Subsets (second-half)
+ { 0,15, 0}, { 0,15, 0}, { 0, 6, 0}, { 0, 8, 0},
+ { 0, 2, 0}, { 0, 8, 0}, { 0,15, 0}, { 0,15, 0},
+ { 0, 2, 0}, { 0, 8, 0}, { 0, 2, 0}, { 0, 2, 0},
+ { 0, 2, 0}, { 0,15, 0}, { 0,15, 0}, { 0, 6, 0},
+ { 0, 6, 0}, { 0, 2, 0}, { 0, 6, 0}, { 0, 8, 0},
+ { 0,15, 0}, { 0,15, 0}, { 0, 2, 0}, { 0, 2, 0},
+ { 0,15, 0}, { 0,15, 0}, { 0,15, 0}, { 0,15, 0},
+ { 0,15, 0}, { 0, 2, 0}, { 0, 2, 0}, { 0,15, 0}
+ },
+
+ { // BC7 Partition Set Fixups for 3 Subsets
+ { 0, 3,15}, { 0, 3, 8}, { 0,15, 8}, { 0,15, 3},
+ { 0, 8,15}, { 0, 3,15}, { 0,15, 3}, { 0,15, 8},
+ { 0, 8,15}, { 0, 8,15}, { 0, 6,15}, { 0, 6,15},
+ { 0, 6,15}, { 0, 5,15}, { 0, 3,15}, { 0, 3, 8},
+ { 0, 3,15}, { 0, 3, 8}, { 0, 8,15}, { 0,15, 3},
+ { 0, 3,15}, { 0, 3, 8}, { 0, 6,15}, { 0,10, 8},
+ { 0, 5, 3}, { 0, 8,15}, { 0, 8, 6}, { 0, 6,10},
+ { 0, 8,15}, { 0, 5,15}, { 0,15,10}, { 0,15, 8},
+ { 0, 8,15}, { 0,15, 3}, { 0, 3,15}, { 0, 5,10},
+ { 0, 6,10}, { 0,10, 8}, { 0, 8, 9}, { 0,15,10},
+ { 0,15, 6}, { 0, 3,15}, { 0,15, 8}, { 0, 5,15},
+ { 0,15, 3}, { 0,15, 6}, { 0,15, 6}, { 0,15, 8},
+ { 0, 3,15}, { 0,15, 3}, { 0, 5,15}, { 0, 5,15},
+ { 0, 5,15}, { 0, 8,15}, { 0, 5,15}, { 0,10,15},
+ { 0, 5,15}, { 0,10,15}, { 0, 8,15}, { 0,13,15},
+ { 0,15, 3}, { 0,12,15}, { 0, 3,15}, { 0, 3, 8}
+ }
+};
+
+// BC6H Compression
+const D3DX_BC6H::ModeDescriptor D3DX_BC6H::ms_aDesc[14][82] =
+{
+ { // 0x00 - 10 5 5 5
+ { M, 0}, { M, 1}, {GY, 4}, {BY, 4}, {BZ, 4}, {RW, 0}, {RW, 1}, {RW, 2}, {RW, 3}, {RW, 4},
+ {RW, 5}, {RW, 6}, {RW, 7}, {RW, 8}, {RW, 9}, {GW, 0}, {GW, 1}, {GW, 2}, {GW, 3}, {GW, 4},
+ {GW, 5}, {GW, 6}, {GW, 7}, {GW, 8}, {GW, 9}, {BW, 0}, {BW, 1}, {BW, 2}, {BW, 3}, {BW, 4},
+ {BW, 5}, {BW, 6}, {BW, 7}, {BW, 8}, {BW, 9}, {RX, 0}, {RX, 1}, {RX, 2}, {RX, 3}, {RX, 4},
+ {GZ, 4}, {GY, 0}, {GY, 1}, {GY, 2}, {GY, 3}, {GX, 0}, {GX, 1}, {GX, 2}, {GX, 3}, {GX, 4},
+ {BZ, 0}, {GZ, 0}, {GZ, 1}, {GZ, 2}, {GZ, 3}, {BX, 0}, {BX, 1}, {BX, 2}, {BX, 3}, {BX, 4},
+ {BZ, 1}, {BY, 0}, {BY, 1}, {BY, 2}, {BY, 3}, {RY, 0}, {RY, 1}, {RY, 2}, {RY, 3}, {RY, 4},
+ {BZ, 2}, {RZ, 0}, {RZ, 1}, {RZ, 2}, {RZ, 3}, {RZ, 4}, {BZ, 3}, { D, 0}, { D, 1}, { D, 2},
+ { D, 3}, { D, 4},
+ },
+
+ { // 0x01 - 7 6 6 6
+ { M, 0}, { M, 1}, {GY, 5}, {GZ, 4}, {GZ, 5}, {RW, 0}, {RW, 1}, {RW, 2}, {RW, 3}, {RW, 4},
+ {RW, 5}, {RW, 6}, {BZ, 0}, {BZ, 1}, {BY, 4}, {GW, 0}, {GW, 1}, {GW, 2}, {GW, 3}, {GW, 4},
+ {GW, 5}, {GW, 6}, {BY, 5}, {BZ, 2}, {GY, 4}, {BW, 0}, {BW, 1}, {BW, 2}, {BW, 3}, {BW, 4},
+ {BW, 5}, {BW, 6}, {BZ, 3}, {BZ, 5}, {BZ, 4}, {RX, 0}, {RX, 1}, {RX, 2}, {RX, 3}, {RX, 4},
+ {RX, 5}, {GY, 0}, {GY, 1}, {GY, 2}, {GY, 3}, {GX, 0}, {GX, 1}, {GX, 2}, {GX, 3}, {GX, 4},
+ {GX, 5}, {GZ, 0}, {GZ, 1}, {GZ, 2}, {GZ, 3}, {BX, 0}, {BX, 1}, {BX, 2}, {BX, 3}, {BX, 4},
+ {BX, 5}, {BY, 0}, {BY, 1}, {BY, 2}, {BY, 3}, {RY, 0}, {RY, 1}, {RY, 2}, {RY, 3}, {RY, 4},
+ {RY, 5}, {RZ, 0}, {RZ, 1}, {RZ, 2}, {RZ, 3}, {RZ, 4}, {RZ, 5}, { D, 0}, { D, 1}, { D, 2},
+ { D, 3}, { D, 4},
+ },
+
+ { // 0x02 - 11 5 4 4
+ { M, 0}, { M, 1}, { M, 2}, { M, 3}, { M, 4}, {RW, 0}, {RW, 1}, {RW, 2}, {RW, 3}, {RW, 4},
+ {RW, 5}, {RW, 6}, {RW, 7}, {RW, 8}, {RW, 9}, {GW, 0}, {GW, 1}, {GW, 2}, {GW, 3}, {GW, 4},
+ {GW, 5}, {GW, 6}, {GW, 7}, {GW, 8}, {GW, 9}, {BW, 0}, {BW, 1}, {BW, 2}, {BW, 3}, {BW, 4},
+ {BW, 5}, {BW, 6}, {BW, 7}, {BW, 8}, {BW, 9}, {RX, 0}, {RX, 1}, {RX, 2}, {RX, 3}, {RX, 4},
+ {RW,10}, {GY, 0}, {GY, 1}, {GY, 2}, {GY, 3}, {GX, 0}, {GX, 1}, {GX, 2}, {GX, 3}, {GW,10},
+ {BZ, 0}, {GZ, 0}, {GZ, 1}, {GZ, 2}, {GZ, 3}, {BX, 0}, {BX, 1}, {BX, 2}, {BX, 3}, {BW,10},
+ {BZ, 1}, {BY, 0}, {BY, 1}, {BY, 2}, {BY, 3}, {RY, 0}, {RY, 1}, {RY, 2}, {RY, 3}, {RY, 4},
+ {BZ, 2}, {RZ, 0}, {RZ, 1}, {RZ, 2}, {RZ, 3}, {RZ, 4}, {BZ, 3}, { D, 0}, { D, 1}, { D, 2},
+ { D, 3}, { D, 4},
+ },
+
+ { // 0x06 - 11 4 5 4
+ { M, 0}, { M, 1}, { M, 2}, { M, 3}, { M, 4}, {RW, 0}, {RW, 1}, {RW, 2}, {RW, 3}, {RW, 4},
+ {RW, 5}, {RW, 6}, {RW, 7}, {RW, 8}, {RW, 9}, {GW, 0}, {GW, 1}, {GW, 2}, {GW, 3}, {GW, 4},
+ {GW, 5}, {GW, 6}, {GW, 7}, {GW, 8}, {GW, 9}, {BW, 0}, {BW, 1}, {BW, 2}, {BW, 3}, {BW, 4},
+ {BW, 5}, {BW, 6}, {BW, 7}, {BW, 8}, {BW, 9}, {RX, 0}, {RX, 1}, {RX, 2}, {RX, 3}, {RW,10},
+ {GZ, 4}, {GY, 0}, {GY, 1}, {GY, 2}, {GY, 3}, {GX, 0}, {GX, 1}, {GX, 2}, {GX, 3}, {GX, 4},
+ {GW,10}, {GZ, 0}, {GZ, 1}, {GZ, 2}, {GZ, 3}, {BX, 0}, {BX, 1}, {BX, 2}, {BX, 3}, {BW,10},
+ {BZ, 1}, {BY, 0}, {BY, 1}, {BY, 2}, {BY, 3}, {RY, 0}, {RY, 1}, {RY, 2}, {RY, 3}, {BZ, 0},
+ {BZ, 2}, {RZ, 0}, {RZ, 1}, {RZ, 2}, {RZ, 3}, {GY, 4}, {BZ, 3}, { D, 0}, { D, 1}, { D, 2},
+ { D, 3}, { D, 4},
+ },
+
+ { // 0x0a - 11 4 4 5
+ { M, 0}, { M, 1}, { M, 2}, { M, 3}, { M, 4}, {RW, 0}, {RW, 1}, {RW, 2}, {RW, 3}, {RW, 4},
+ {RW, 5}, {RW, 6}, {RW, 7}, {RW, 8}, {RW, 9}, {GW, 0}, {GW, 1}, {GW, 2}, {GW, 3}, {GW, 4},
+ {GW, 5}, {GW, 6}, {GW, 7}, {GW, 8}, {GW, 9}, {BW, 0}, {BW, 1}, {BW, 2}, {BW, 3}, {BW, 4},
+ {BW, 5}, {BW, 6}, {BW, 7}, {BW, 8}, {BW, 9}, {RX, 0}, {RX, 1}, {RX, 2}, {RX, 3}, {RW,10},
+ {BY, 4}, {GY, 0}, {GY, 1}, {GY, 2}, {GY, 3}, {GX, 0}, {GX, 1}, {GX, 2}, {GX, 3}, {GW,10},
+ {BZ, 0}, {GZ, 0}, {GZ, 1}, {GZ, 2}, {GZ, 3}, {BX, 0}, {BX, 1}, {BX, 2}, {BX, 3}, {BX, 4},
+ {BW,10}, {BY, 0}, {BY, 1}, {BY, 2}, {BY, 3}, {RY, 0}, {RY, 1}, {RY, 2}, {RY, 3}, {BZ, 1},
+ {BZ, 2}, {RZ, 0}, {RZ, 1}, {RZ, 2}, {RZ, 3}, {BZ, 4}, {BZ, 3}, { D, 0}, { D, 1}, { D, 2},
+ { D, 3}, { D, 4},
+ },
+
+ { // 0x0e - 9 5 5 5
+ { M, 0}, { M, 1}, { M, 2}, { M, 3}, { M, 4}, {RW, 0}, {RW, 1}, {RW, 2}, {RW, 3}, {RW, 4},
+ {RW, 5}, {RW, 6}, {RW, 7}, {RW, 8}, {BY, 4}, {GW, 0}, {GW, 1}, {GW, 2}, {GW, 3}, {GW, 4},
+ {GW, 5}, {GW, 6}, {GW, 7}, {GW, 8}, {GY, 4}, {BW, 0}, {BW, 1}, {BW, 2}, {BW, 3}, {BW, 4},
+ {BW, 5}, {BW, 6}, {BW, 7}, {BW, 8}, {BZ, 4}, {RX, 0}, {RX, 1}, {RX, 2}, {RX, 3}, {RX, 4},
+ {GZ, 4}, {GY, 0}, {GY, 1}, {GY, 2}, {GY, 3}, {GX, 0}, {GX, 1}, {GX, 2}, {GX, 3}, {GX, 4},
+ {BZ, 0}, {GZ, 0}, {GZ, 1}, {GZ, 2}, {GZ, 3}, {BX, 0}, {BX, 1}, {BX, 2}, {BX, 3}, {BX, 4},
+ {BZ, 1}, {BY, 0}, {BY, 1}, {BY, 2}, {BY, 3}, {RY, 0}, {RY, 1}, {RY, 2}, {RY, 3}, {RY, 4},
+ {BZ, 2}, {RZ, 0}, {RZ, 1}, {RZ, 2}, {RZ, 3}, {RZ, 4}, {BZ, 3}, { D, 0}, { D, 1}, { D, 2},
+ { D, 3}, { D, 4},
+ },
+
+ { // 0x12 - 8 6 5 5
+ { M, 0}, { M, 1}, { M, 2}, { M, 3}, { M, 4}, {RW, 0}, {RW, 1}, {RW, 2}, {RW, 3}, {RW, 4},
+ {RW, 5}, {RW, 6}, {RW, 7}, {GZ, 4}, {BY, 4}, {GW, 0}, {GW, 1}, {GW, 2}, {GW, 3}, {GW, 4},
+ {GW, 5}, {GW, 6}, {GW, 7}, {BZ, 2}, {GY, 4}, {BW, 0}, {BW, 1}, {BW, 2}, {BW, 3}, {BW, 4},
+ {BW, 5}, {BW, 6}, {BW, 7}, {BZ, 3}, {BZ, 4}, {RX, 0}, {RX, 1}, {RX, 2}, {RX, 3}, {RX, 4},
+ {RX, 5}, {GY, 0}, {GY, 1}, {GY, 2}, {GY, 3}, {GX, 0}, {GX, 1}, {GX, 2}, {GX, 3}, {GX, 4},
+ {BZ, 0}, {GZ, 0}, {GZ, 1}, {GZ, 2}, {GZ, 3}, {BX, 0}, {BX, 1}, {BX, 2}, {BX, 3}, {BX, 4},
+ {BZ, 1}, {BY, 0}, {BY, 1}, {BY, 2}, {BY, 3}, {RY, 0}, {RY, 1}, {RY, 2}, {RY, 3}, {RY, 4},
+ {RY, 5}, {RZ, 0}, {RZ, 1}, {RZ, 2}, {RZ, 3}, {RZ, 4}, {RZ, 5}, { D, 0}, { D, 1}, { D, 2},
+ { D, 3}, { D, 4},
+ },
+
+ { // 0x16 - 8 5 6 5
+ { M, 0}, { M, 1}, { M, 2}, { M, 3}, { M, 4}, {RW, 0}, {RW, 1}, {RW, 2}, {RW, 3}, {RW, 4},
+ {RW, 5}, {RW, 6}, {RW, 7}, {BZ, 0}, {BY, 4}, {GW, 0}, {GW, 1}, {GW, 2}, {GW, 3}, {GW, 4},
+ {GW, 5}, {GW, 6}, {GW, 7}, {GY, 5}, {GY, 4}, {BW, 0}, {BW, 1}, {BW, 2}, {BW, 3}, {BW, 4},
+ {BW, 5}, {BW, 6}, {BW, 7}, {GZ, 5}, {BZ, 4}, {RX, 0}, {RX, 1}, {RX, 2}, {RX, 3}, {RX, 4},
+ {GZ, 4}, {GY, 0}, {GY, 1}, {GY, 2}, {GY, 3}, {GX, 0}, {GX, 1}, {GX, 2}, {GX, 3}, {GX, 4},
+ {GX, 5}, {GZ, 0}, {GZ, 1}, {GZ, 2}, {GZ, 3}, {BX, 0}, {BX, 1}, {BX, 2}, {BX, 3}, {BX, 4},
+ {BZ, 1}, {BY, 0}, {BY, 1}, {BY, 2}, {BY, 3}, {RY, 0}, {RY, 1}, {RY, 2}, {RY, 3}, {RY, 4},
+ {BZ, 2}, {RZ, 0}, {RZ, 1}, {RZ, 2}, {RZ, 3}, {RZ, 4}, {BZ, 3}, { D, 0}, { D, 1}, { D, 2},
+ { D, 3}, { D, 4},
+ },
+
+ { // 0x1a - 8 5 5 6
+ { M, 0}, { M, 1}, { M, 2}, { M, 3}, { M, 4}, {RW, 0}, {RW, 1}, {RW, 2}, {RW, 3}, {RW, 4},
+ {RW, 5}, {RW, 6}, {RW, 7}, {BZ, 1}, {BY, 4}, {GW, 0}, {GW, 1}, {GW, 2}, {GW, 3}, {GW, 4},
+ {GW, 5}, {GW, 6}, {GW, 7}, {BY, 5}, {GY, 4}, {BW, 0}, {BW, 1}, {BW, 2}, {BW, 3}, {BW, 4},
+ {BW, 5}, {BW, 6}, {BW, 7}, {BZ, 5}, {BZ, 4}, {RX, 0}, {RX, 1}, {RX, 2}, {RX, 3}, {RX, 4},
+ {GZ, 4}, {GY, 0}, {GY, 1}, {GY, 2}, {GY, 3}, {GX, 0}, {GX, 1}, {GX, 2}, {GX, 3}, {GX, 4},
+ {BZ, 0}, {GZ, 0}, {GZ, 1}, {GZ, 2}, {GZ, 3}, {BX, 0}, {BX, 1}, {BX, 2}, {BX, 3}, {BX, 4},
+ {BX, 5}, {BY, 0}, {BY, 1}, {BY, 2}, {BY, 3}, {RY, 0}, {RY, 1}, {RY, 2}, {RY, 3}, {RY, 4},
+ {BZ, 2}, {RZ, 0}, {RZ, 1}, {RZ, 2}, {RZ, 3}, {RZ, 4}, {BZ, 3}, { D, 0}, { D, 1}, { D, 2},
+ { D, 3}, { D, 4},
+ },
+
+ { // 0x1e - 6 6 6 6
+ { M, 0}, { M, 1}, { M, 2}, { M, 3}, { M, 4}, {RW, 0}, {RW, 1}, {RW, 2}, {RW, 3}, {RW, 4},
+ {RW, 5}, {GZ, 4}, {BZ, 0}, {BZ, 1}, {BY, 4}, {GW, 0}, {GW, 1}, {GW, 2}, {GW, 3}, {GW, 4},
+ {GW, 5}, {GY, 5}, {BY, 5}, {BZ, 2}, {GY, 4}, {BW, 0}, {BW, 1}, {BW, 2}, {BW, 3}, {BW, 4},
+ {BW, 5}, {GZ, 5}, {BZ, 3}, {BZ, 5}, {BZ, 4}, {RX, 0}, {RX, 1}, {RX, 2}, {RX, 3}, {RX, 4},
+ {RX, 5}, {GY, 0}, {GY, 1}, {GY, 2}, {GY, 3}, {GX, 0}, {GX, 1}, {GX, 2}, {GX, 3}, {GX, 4},
+ {GX, 5}, {GZ, 0}, {GZ, 1}, {GZ, 2}, {GZ, 3}, {BX, 0}, {BX, 1}, {BX, 2}, {BX, 3}, {BX, 4},
+ {BX, 5}, {BY, 0}, {BY, 1}, {BY, 2}, {BY, 3}, {RY, 0}, {RY, 1}, {RY, 2}, {RY, 3}, {RY, 4},
+ {RY, 5}, {RZ, 0}, {RZ, 1}, {RZ, 2}, {RZ, 3}, {RZ, 4}, {RZ, 5}, { D, 0}, { D, 1}, { D, 2},
+ { D, 3}, { D, 4},
+ },
+
+ { // 0x03 - 10 10
+ { M, 0}, { M, 1}, { M, 2}, { M, 3}, { M, 4}, {RW, 0}, {RW, 1}, {RW, 2}, {RW, 3}, {RW, 4},
+ {RW, 5}, {RW, 6}, {RW, 7}, {RW, 8}, {RW, 9}, {GW, 0}, {GW, 1}, {GW, 2}, {GW, 3}, {GW, 4},
+ {GW, 5}, {GW, 6}, {GW, 7}, {GW, 8}, {GW, 9}, {BW, 0}, {BW, 1}, {BW, 2}, {BW, 3}, {BW, 4},
+ {BW, 5}, {BW, 6}, {BW, 7}, {BW, 8}, {BW, 9}, {RX, 0}, {RX, 1}, {RX, 2}, {RX, 3}, {RX, 4},
+ {RX, 5}, {RX, 6}, {RX, 7}, {RX, 8}, {RX, 9}, {GX, 0}, {GX, 1}, {GX, 2}, {GX, 3}, {GX, 4},
+ {GX, 5}, {GX, 6}, {GX, 7}, {GX, 8}, {GX, 9}, {BX, 0}, {BX, 1}, {BX, 2}, {BX, 3}, {BX, 4},
+ {BX, 5}, {BX, 6}, {BX, 7}, {BX, 8}, {BX, 9}, {NA, 0}, {NA, 0}, {NA, 0}, {NA, 0}, {NA, 0},
+ {NA, 0}, {NA, 0}, {NA, 0}, {NA, 0}, {NA, 0}, {NA, 0}, {NA, 0}, {NA, 0}, {NA, 0}, {NA, 0},
+ {NA, 0}, {NA, 0},
+ },
+
+ { // 0x07 - 11 9
+ { M, 0}, { M, 1}, { M, 2}, { M, 3}, { M, 4}, {RW, 0}, {RW, 1}, {RW, 2}, {RW, 3}, {RW, 4},
+ {RW, 5}, {RW, 6}, {RW, 7}, {RW, 8}, {RW, 9}, {GW, 0}, {GW, 1}, {GW, 2}, {GW, 3}, {GW, 4},
+ {GW, 5}, {GW, 6}, {GW, 7}, {GW, 8}, {GW, 9}, {BW, 0}, {BW, 1}, {BW, 2}, {BW, 3}, {BW, 4},
+ {BW, 5}, {BW, 6}, {BW, 7}, {BW, 8}, {BW, 9}, {RX, 0}, {RX, 1}, {RX, 2}, {RX, 3}, {RX, 4},
+ {RX, 5}, {RX, 6}, {RX, 7}, {RX, 8}, {RW,10}, {GX, 0}, {GX, 1}, {GX, 2}, {GX, 3}, {GX, 4},
+ {GX, 5}, {GX, 6}, {GX, 7}, {GX, 8}, {GW,10}, {BX, 0}, {BX, 1}, {BX, 2}, {BX, 3}, {BX, 4},
+ {BX, 5}, {BX, 6}, {BX, 7}, {BX, 8}, {BW,10}, {NA, 0}, {NA, 0}, {NA, 0}, {NA, 0}, {NA, 0},
+ {NA, 0}, {NA, 0}, {NA, 0}, {NA, 0}, {NA, 0}, {NA, 0}, {NA, 0}, {NA, 0}, {NA, 0}, {NA, 0},
+ {NA, 0}, {NA, 0},
+ },
+
+ { // 0x0b - 12 8
+ { M, 0}, { M, 1}, { M, 2}, { M, 3}, { M, 4}, {RW, 0}, {RW, 1}, {RW, 2}, {RW, 3}, {RW, 4},
+ {RW, 5}, {RW, 6}, {RW, 7}, {RW, 8}, {RW, 9}, {GW, 0}, {GW, 1}, {GW, 2}, {GW, 3}, {GW, 4},
+ {GW, 5}, {GW, 6}, {GW, 7}, {GW, 8}, {GW, 9}, {BW, 0}, {BW, 1}, {BW, 2}, {BW, 3}, {BW, 4},
+ {BW, 5}, {BW, 6}, {BW, 7}, {BW, 8}, {BW, 9}, {RX, 0}, {RX, 1}, {RX, 2}, {RX, 3}, {RX, 4},
+ {RX, 5}, {RX, 6}, {RX, 7}, {RW,11}, {RW,10}, {GX, 0}, {GX, 1}, {GX, 2}, {GX, 3}, {GX, 4},
+ {GX, 5}, {GX, 6}, {GX, 7}, {GW,11}, {GW,10}, {BX, 0}, {BX, 1}, {BX, 2}, {BX, 3}, {BX, 4},
+ {BX, 5}, {BX, 6}, {BX, 7}, {BW,11}, {BW,10}, {NA, 0}, {NA, 0}, {NA, 0}, {NA, 0}, {NA, 0},
+ {NA, 0}, {NA, 0}, {NA, 0}, {NA, 0}, {NA, 0}, {NA, 0}, {NA, 0}, {NA, 0}, {NA, 0}, {NA, 0},
+ {NA, 0}, {NA, 0},
+ },
+
+ { // 0x0f - 16 4
+ { M, 0}, { M, 1}, { M, 2}, { M, 3}, { M, 4}, {RW, 0}, {RW, 1}, {RW, 2}, {RW, 3}, {RW, 4},
+ {RW, 5}, {RW, 6}, {RW, 7}, {RW, 8}, {RW, 9}, {GW, 0}, {GW, 1}, {GW, 2}, {GW, 3}, {GW, 4},
+ {GW, 5}, {GW, 6}, {GW, 7}, {GW, 8}, {GW, 9}, {BW, 0}, {BW, 1}, {BW, 2}, {BW, 3}, {BW, 4},
+ {BW, 5}, {BW, 6}, {BW, 7}, {BW, 8}, {BW, 9}, {RX, 0}, {RX, 1}, {RX, 2}, {RX, 3}, {RW,15},
+ {RW,14}, {RW,13}, {RW,12}, {RW,11}, {RW,10}, {GX, 0}, {GX, 1}, {GX, 2}, {GX, 3}, {GW,15},
+ {GW,14}, {GW,13}, {GW,12}, {GW,11}, {GW,10}, {BX, 0}, {BX, 1}, {BX, 2}, {BX, 3}, {BW,15},
+ {BW,14}, {BW,13}, {BW,12}, {BW,11}, {BW,10}, {NA, 0}, {NA, 0}, {NA, 0}, {NA, 0}, {NA, 0},
+ {NA, 0}, {NA, 0}, {NA, 0}, {NA, 0}, {NA, 0}, {NA, 0}, {NA, 0}, {NA, 0}, {NA, 0}, {NA, 0},
+ {NA, 0}, {NA, 0},
+ },
+};
+
+// Mode, Partitions, Transformed, IndexPrec, RGBAPrec
+const D3DX_BC6H::ModeInfo D3DX_BC6H::ms_aInfo[] =
+{
+ {0x00, 1, true, 3, LDRColorA(10,10,10,0), LDRColorA( 5, 5, 5,0), LDRColorA(5,5,5,0), LDRColorA(5,5,5,0)}, // Mode 0
+ {0x01, 1, true, 3, LDRColorA( 7, 7, 7,0), LDRColorA( 6, 6, 6,0), LDRColorA(6,6,6,0), LDRColorA(6,6,6,0)}, // Mode 1
+ {0x02, 1, true, 3, LDRColorA(11,11,11,0), LDRColorA( 5, 4, 4,0), LDRColorA(5,4,4,0), LDRColorA(5,4,4,0)}, // Mode 2
+ {0x06, 1, true, 3, LDRColorA(11,11,11,0), LDRColorA( 4, 5, 4,0), LDRColorA(4,5,4,0), LDRColorA(4,5,4,0)}, // Mode 3
+ {0x0a, 1, true, 3, LDRColorA(11,11,11,0), LDRColorA( 4, 4, 5,0), LDRColorA(4,4,5,0), LDRColorA(4,4,5,0)}, // Mode 4
+ {0x0e, 1, true, 3, LDRColorA( 9, 9, 9,0), LDRColorA( 5, 5, 5,0), LDRColorA(5,5,5,0), LDRColorA(5,5,5,0)}, // Mode 5
+ {0x12, 1, true, 3, LDRColorA( 8, 8, 8,0), LDRColorA( 6, 5, 5,0), LDRColorA(6,5,5,0), LDRColorA(6,5,5,0)}, // Mode 6
+ {0x16, 1, true, 3, LDRColorA( 8, 8, 8,0), LDRColorA( 5, 6, 5,0), LDRColorA(5,6,5,0), LDRColorA(5,6,5,0)}, // Mode 7
+ {0x1a, 1, true, 3, LDRColorA( 8, 8, 8,0), LDRColorA( 5, 5, 6,0), LDRColorA(5,5,6,0), LDRColorA(5,5,6,0)}, // Mode 8
+ {0x1e, 1, false, 3, LDRColorA( 6, 6, 6,0), LDRColorA( 6, 6, 6,0), LDRColorA(6,6,6,0), LDRColorA(6,6,6,0)}, // Mode 9
+ {0x03, 0, false, 4, LDRColorA(10,10,10,0), LDRColorA(10,10,10,0), LDRColorA(0,0,0,0), LDRColorA(0,0,0,0)}, // Mode 10
+ {0x07, 0, true, 4, LDRColorA(11,11,11,0), LDRColorA( 9, 9, 9,0), LDRColorA(0,0,0,0), LDRColorA(0,0,0,0)}, // Mode 11
+ {0x0b, 0, true, 4, LDRColorA(12,12,12,0), LDRColorA( 8, 8, 8,0), LDRColorA(0,0,0,0), LDRColorA(0,0,0,0)}, // Mode 12
+ {0x0f, 0, true, 4, LDRColorA(16,16,16,0), LDRColorA( 4, 4, 4,0), LDRColorA(0,0,0,0), LDRColorA(0,0,0,0)}, // Mode 13
+};
+
+const int D3DX_BC6H::ms_aModeToInfo[] =
+{
+ 0, // 0x00
+ 1, // 0x01
+ 2, // 0x02
+ 10, // 0x03
+ -1, // 0x04
+ -1, // 0x05
+ 3, // 0x06
+ 11, // 0x07
+ -1, // 0x08
+ -1, // 0x09
+ 4, // 0x0a
+ 12, // 0x0b
+ -1, // 0x0c
+ -1, // 0x0d
+ 5, // 0x0e
+ 13, // 0x0f
+ -1, // 0x10
+ -1, // 0x11
+ 6, // 0x12
+ -1, // 0x13
+ -1, // 0x14
+ -1, // 0x15
+ 7, // 0x16
+ -1, // 0x17
+ -1, // 0x18
+ -1, // 0x19
+ 8, // 0x1a
+ -1, // 0x1b
+ -1, // 0x1c
+ -1, // 0x1d
+ 9, // 0x1e
+ -1, // 0x1f
+};
+
+// BC7 compression: uPartitions, uPartitionBits, uPBits, uRotationBits, uIndexModeBits, uIndexPrec, uIndexPrec2, RGBAPrec, RGBAPrecWithP
+const D3DX_BC7::ModeInfo D3DX_BC7::ms_aInfo[] =
+{
+ {2, 4, 6, 0, 0, 3, 0, LDRColorA(4,4,4,0), LDRColorA(5,5,5,0)},
+ // Mode 0: Color only, 3 Subsets, RGBP 4441 (unique P-bit), 3-bit indecies, 16 partitions
+ {1, 6, 2, 0, 0, 3, 0, LDRColorA(6,6,6,0), LDRColorA(7,7,7,0)},
+ // Mode 1: Color only, 2 Subsets, RGBP 6661 (shared P-bit), 3-bit indecies, 64 partitions
+ {2, 6, 0, 0, 0, 2, 0, LDRColorA(5,5,5,0), LDRColorA(5,5,5,0)},
+ // Mode 2: Color only, 3 Subsets, RGB 555, 2-bit indecies, 64 partitions
+ {1, 6, 4, 0, 0, 2, 0, LDRColorA(7,7,7,0), LDRColorA(8,8,8,0)},
+ // Mode 3: Color only, 2 Subsets, RGBP 7771 (unique P-bit), 2-bits indecies, 64 partitions
+ {0, 0, 0, 2, 1, 2, 3, LDRColorA(5,5,5,6), LDRColorA(5,5,5,6)},
+ // Mode 4: Color w/ Separate Alpha, 1 Subset, RGB 555, A6, 16x2/16x3-bit indices, 2-bit rotation, 1-bit index selector
+ {0, 0, 0, 2, 0, 2, 2, LDRColorA(7,7,7,8), LDRColorA(7,7,7,8)},
+ // Mode 5: Color w/ Separate Alpha, 1 Subset, RGB 777, A8, 16x2/16x2-bit indices, 2-bit rotation
+ {0, 0, 2, 0, 0, 4, 0, LDRColorA(7,7,7,7), LDRColorA(8,8,8,8)},
+ // Mode 6: Color+Alpha, 1 Subset, RGBAP 77771 (unique P-bit), 16x4-bit indecies
+ {1, 6, 4, 0, 0, 2, 0, LDRColorA(5,5,5,5), LDRColorA(6,6,6,6)}
+ // Mode 7: Color+Alpha, 2 Subsets, RGBAP 55551 (unique P-bit), 2-bit indices, 64 partitions
+};
+
+
+//-------------------------------------------------------------------------------------
+// Helper functions
+//-------------------------------------------------------------------------------------
+template< class T >
+inline static void Swap( T& a, T& b )
+{
+ T temp = a;
+ a = b;
+ b = temp;
+}
+
+inline static bool IsFixUpOffset(_In_range_(0,2) size_t uPartitions, _In_range_(0,63) size_t uShape, _In_range_(0,15) size_t uOffset)
+{
+ assert(uPartitions < 3 && uShape < 64 && uOffset < 16);
+ __analysis_assume(uPartitions < 3 && uShape < 64 && uOffset < 16);
+ for(size_t p = 0; p <= uPartitions; p++)
+ {
+ if(uOffset == g_aFixUp[uPartitions][uShape][p])
+ {
+ return true;
+ }
+ }
+ return false;
+}
+
+inline static float ErrorMetricRGB(_In_ const LDRColorA& a, _In_ const LDRColorA& b)
+{
+ float er = float(a.r) - float(b.r);
+ float eg = float(a.g) - float(b.g);
+ float eb = float(a.b) - float(b.b);
+ // weigh the components nonuniformly
+ //er *= 0.299;
+ //eg *= 0.587;
+ //eb *= 0.114;
+ return er*er + eg*eg + eb*eb;
+}
+
+inline static float ErrorMetricAlpha(_In_ const LDRColorA& a, _In_ const LDRColorA& b)
+{
+ float ea = float(a.a) - float(b.a);
+ return ea*ea;
+}
+
+inline static float ErrorMetric(_In_ const LDRColorA& a, _In_ const LDRColorA& b)
+{
+ return ErrorMetricRGB(a, b) + ErrorMetricAlpha(a, b);
+}
+
+inline static void TransformForward(_Inout_count_c_(BC6H_MAX_REGIONS) INTEndPntPair aEndPts[])
+{
+ aEndPts[0].B -= aEndPts[0].A;
+ aEndPts[1].A -= aEndPts[0].A;
+ aEndPts[1].B -= aEndPts[0].A;
+}
+
+inline static void TransformInverse(_Inout_count_c_(BC6H_MAX_REGIONS) INTEndPntPair aEndPts[], _In_ const LDRColorA& Prec, _In_ bool bSigned)
+{
+ INTColor WrapMask((1 << Prec.r) - 1, (1 << Prec.g) - 1, (1 << Prec.b) - 1);
+ aEndPts[0].B += aEndPts[0].A; aEndPts[0].B &= WrapMask;
+ aEndPts[1].A += aEndPts[0].A; aEndPts[1].A &= WrapMask;
+ aEndPts[1].B += aEndPts[0].A; aEndPts[1].B &= WrapMask;
+ if(bSigned)
+ {
+ aEndPts[0].B.SignExtend(Prec);
+ aEndPts[1].A.SignExtend(Prec);
+ aEndPts[1].B.SignExtend(Prec);
+ }
+}
+
+inline static float Norm(_In_ const INTColor& a, _In_ const INTColor& b)
+{
+ float dr = float(a.r) - float(b.r);
+ float dg = float(a.g) - float(b.g);
+ float db = float(a.b) - float(b.b);
+ return dr * dr + dg * dg + db * db;
+}
+
+// return # of bits needed to store n. handle signed or unsigned cases properly
+inline static int NBits(_In_ int n, _In_ bool bIsSigned)
+{
+ int nb;
+ if(n == 0)
+ {
+ return 0; // no bits needed for 0, signed or not
+ }
+ else if(n > 0)
+ {
+ for(nb = 0; n; ++nb, n >>= 1);
+ return nb + (bIsSigned ? 1 : 0);
+ }
+ else
+ {
+ assert(bIsSigned);
+ for(nb = 0; n < -1; ++nb, n >>= 1) ;
+ return nb + 1;
+ }
+}
+
+
+//-------------------------------------------------------------------------------------
+static float OptimizeRGB(_In_count_c_(NUM_PIXELS_PER_BLOCK) const HDRColorA* const pPoints,
+ _Out_ HDRColorA* pX, _Out_ HDRColorA* pY,
+ _In_ size_t cSteps, _In_ size_t cPixels, _In_count_(cPixels) const size_t* pIndex)
+{
+ float fError = FLT_MAX;
+ const float *pC = (3 == cSteps) ? pC3 : pC4;
+ const float *pD = (3 == cSteps) ? pD3 : pD4;
+
+ // Find Min and Max points, as starting point
+ HDRColorA X(1.0f, 1.0f, 1.0f, 0.0f);
+ HDRColorA Y(0.0f, 0.0f, 0.0f, 0.0f);
+
+ for(size_t iPoint = 0; iPoint < cPixels; iPoint++)
+ {
+ if(pPoints[pIndex[iPoint]].r < X.r) X.r = pPoints[pIndex[iPoint]].r;
+ if(pPoints[pIndex[iPoint]].g < X.g) X.g = pPoints[pIndex[iPoint]].g;
+ if(pPoints[pIndex[iPoint]].b < X.b) X.b = pPoints[pIndex[iPoint]].b;
+ if(pPoints[pIndex[iPoint]].r > Y.r) Y.r = pPoints[pIndex[iPoint]].r;
+ if(pPoints[pIndex[iPoint]].g > Y.g) Y.g = pPoints[pIndex[iPoint]].g;
+ if(pPoints[pIndex[iPoint]].b > Y.b) Y.b = pPoints[pIndex[iPoint]].b;
+ }
+
+ // Diagonal axis
+ HDRColorA AB;
+ AB.r = Y.r - X.r;
+ AB.g = Y.g - X.g;
+ AB.b = Y.b - X.b;
+
+ float fAB = AB.r * AB.r + AB.g * AB.g + AB.b * AB.b;
+
+ // Single color block.. no need to root-find
+ if(fAB < FLT_MIN)
+ {
+ pX->r = X.r; pX->g = X.g; pX->b = X.b;
+ pY->r = Y.r; pY->g = Y.g; pY->b = Y.b;
+ return 0.0f;
+ }
+
+ // Try all four axis directions, to determine which diagonal best fits data
+ float fABInv = 1.0f / fAB;
+
+ HDRColorA Dir;
+ Dir.r = AB.r * fABInv;
+ Dir.g = AB.g * fABInv;
+ Dir.b = AB.b * fABInv;
+
+ HDRColorA Mid;
+ Mid.r = (X.r + Y.r) * 0.5f;
+ Mid.g = (X.g + Y.g) * 0.5f;
+ Mid.b = (X.b + Y.b) * 0.5f;
+
+ float fDir[4];
+ fDir[0] = fDir[1] = fDir[2] = fDir[3] = 0.0f;
+
+ for(size_t iPoint = 0; iPoint < cPixels; iPoint++)
+ {
+ HDRColorA Pt;
+ Pt.r = (pPoints[pIndex[iPoint]].r - Mid.r) * Dir.r;
+ Pt.g = (pPoints[pIndex[iPoint]].g - Mid.g) * Dir.g;
+ Pt.b = (pPoints[pIndex[iPoint]].b - Mid.b) * Dir.b;
+
+ float f;
+ f = Pt.r + Pt.g + Pt.b; fDir[0] += f * f;
+ f = Pt.r + Pt.g - Pt.b; fDir[1] += f * f;
+ f = Pt.r - Pt.g + Pt.b; fDir[2] += f * f;
+ f = Pt.r - Pt.g - Pt.b; fDir[3] += f * f;
+ }
+
+ float fDirMax = fDir[0];
+ size_t iDirMax = 0;
+
+ for(size_t iDir = 1; iDir < 4; iDir++)
+ {
+ if(fDir[iDir] > fDirMax)
+ {
+ fDirMax = fDir[iDir];
+ iDirMax = iDir;
+ }
+ }
+
+ if(iDirMax & 2) Swap( X.g, Y.g );
+ if(iDirMax & 1) Swap( X.b, Y.b );
+
+ // Two color block.. no need to root-find
+ if(fAB < 1.0f / 4096.0f)
+ {
+ pX->r = X.r; pX->g = X.g; pX->b = X.b;
+ pY->r = Y.r; pY->g = Y.g; pY->b = Y.b;
+ return 0.0f;
+ }
+
+ // Use Newton's Method to find local minima of sum-of-squares error.
+ float fSteps = (float) (cSteps - 1);
+
+ for(size_t iIteration = 0; iIteration < 8; iIteration++)
+ {
+ // Calculate new steps
+ HDRColorA pSteps[4];
+
+ for(size_t iStep = 0; iStep < cSteps; iStep++)
+ {
+ pSteps[iStep].r = X.r * pC[iStep] + Y.r * pD[iStep];
+ pSteps[iStep].g = X.g * pC[iStep] + Y.g * pD[iStep];
+ pSteps[iStep].b = X.b * pC[iStep] + Y.b * pD[iStep];
+ }
+
+ // Calculate color direction
+ Dir.r = Y.r - X.r;
+ Dir.g = Y.g - X.g;
+ Dir.b = Y.b - X.b;
+
+ float fLen = (Dir.r * Dir.r + Dir.g * Dir.g + Dir.b * Dir.b);
+
+ if(fLen < (1.0f / 4096.0f))
+ break;
+
+ float fScale = fSteps / fLen;
+
+ Dir.r *= fScale;
+ Dir.g *= fScale;
+ Dir.b *= fScale;
+
+ // Evaluate function, and derivatives
+ float d2X = 0.0f, d2Y = 0.0f;
+ HDRColorA dX(0.0f, 0.0f, 0.0f, 0.0f), dY(0.0f, 0.0f, 0.0f, 0.0f);
+
+ for(size_t iPoint = 0; iPoint < cPixels; iPoint++)
+ {
+ float fDot = (pPoints[pIndex[iPoint]].r - X.r) * Dir.r +
+ (pPoints[pIndex[iPoint]].g - X.g) * Dir.g +
+ (pPoints[pIndex[iPoint]].b - X.b) * Dir.b;
+
+ size_t iStep;
+ if(fDot <= 0.0f)
+ iStep = 0;
+ if(fDot >= fSteps)
+ iStep = cSteps - 1;
+ else
+ iStep = size_t(fDot + 0.5f);
+
+ HDRColorA Diff;
+ Diff.r = pSteps[iStep].r - pPoints[pIndex[iPoint]].r;
+ Diff.g = pSteps[iStep].g - pPoints[pIndex[iPoint]].g;
+ Diff.b = pSteps[iStep].b - pPoints[pIndex[iPoint]].b;
+
+ float fC = pC[iStep] * (1.0f / 8.0f);
+ float fD = pD[iStep] * (1.0f / 8.0f);
+
+ d2X += fC * pC[iStep];
+ dX.r += fC * Diff.r;
+ dX.g += fC * Diff.g;
+ dX.b += fC * Diff.b;
+
+ d2Y += fD * pD[iStep];
+ dY.r += fD * Diff.r;
+ dY.g += fD * Diff.g;
+ dY.b += fD * Diff.b;
+ }
+
+ // Move endpoints
+ if(d2X > 0.0f)
+ {
+ float f = -1.0f / d2X;
+
+ X.r += dX.r * f;
+ X.g += dX.g * f;
+ X.b += dX.b * f;
+ }
+
+ if(d2Y > 0.0f)
+ {
+ float f = -1.0f / d2Y;
+
+ Y.r += dY.r * f;
+ Y.g += dY.g * f;
+ Y.b += dY.b * f;
+ }
+
+ if((dX.r * dX.r < fEpsilon) && (dX.g * dX.g < fEpsilon) && (dX.b * dX.b < fEpsilon) &&
+ (dY.r * dY.r < fEpsilon) && (dY.g * dY.g < fEpsilon) && (dY.b * dY.b < fEpsilon))
+ {
+ break;
+ }
+ }
+
+ pX->r = X.r; pX->g = X.g; pX->b = X.b;
+ pY->r = Y.r; pY->g = Y.g; pY->b = Y.b;
+ return fError;
+}
+
+
+//-------------------------------------------------------------------------------------
+static float OptimizeRGBA(_In_count_c_(NUM_PIXELS_PER_BLOCK) const HDRColorA* const pPoints,
+ _Out_ HDRColorA* pX, _Out_ HDRColorA* pY,
+ _In_ size_t cSteps, _In_ size_t cPixels, _In_count_(cPixels) const size_t* pIndex)
+{
+ float fError = FLT_MAX;
+ const float *pC = (3 == cSteps) ? pC3 : pC4;
+ const float *pD = (3 == cSteps) ? pD3 : pD4;
+
+ // Find Min and Max points, as starting point
+ HDRColorA X(1.0f, 1.0f, 1.0f, 1.0f);
+ HDRColorA Y(0.0f, 0.0f, 0.0f, 0.0f);
+
+ for(size_t iPoint = 0; iPoint < cPixels; iPoint++)
+ {
+ if(pPoints[pIndex[iPoint]].r < X.r) X.r = pPoints[pIndex[iPoint]].r;
+ if(pPoints[pIndex[iPoint]].g < X.g) X.g = pPoints[pIndex[iPoint]].g;
+ if(pPoints[pIndex[iPoint]].b < X.b) X.b = pPoints[pIndex[iPoint]].b;
+ if(pPoints[pIndex[iPoint]].a < X.a) X.a = pPoints[pIndex[iPoint]].a;
+ if(pPoints[pIndex[iPoint]].r > Y.r) Y.r = pPoints[pIndex[iPoint]].r;
+ if(pPoints[pIndex[iPoint]].g > Y.g) Y.g = pPoints[pIndex[iPoint]].g;
+ if(pPoints[pIndex[iPoint]].b > Y.b) Y.b = pPoints[pIndex[iPoint]].b;
+ if(pPoints[pIndex[iPoint]].a > Y.a) Y.a = pPoints[pIndex[iPoint]].a;
+ }
+
+ // Diagonal axis
+ HDRColorA AB = Y - X;
+ float fAB = AB * AB;
+
+ // Single color block.. no need to root-find
+ if(fAB < FLT_MIN)
+ {
+ *pX = X;
+ *pY = Y;
+ return 0.0f;
+ }
+
+ // Try all four axis directions, to determine which diagonal best fits data
+ float fABInv = 1.0f / fAB;
+ HDRColorA Dir = AB * fABInv;
+ HDRColorA Mid = (X + Y) * 0.5f;
+
+ float fDir[8];
+ fDir[0] = fDir[1] = fDir[2] = fDir[3] = fDir[4] = fDir[5] = fDir[6] = fDir[7] = 0.0f;
+
+ for(size_t iPoint = 0; iPoint < cPixels; iPoint++)
+ {
+ HDRColorA Pt;
+ Pt.r = (pPoints[pIndex[iPoint]].r - Mid.r) * Dir.r;
+ Pt.g = (pPoints[pIndex[iPoint]].g - Mid.g) * Dir.g;
+ Pt.b = (pPoints[pIndex[iPoint]].b - Mid.b) * Dir.b;
+ Pt.a = (pPoints[pIndex[iPoint]].a - Mid.a) * Dir.a;
+
+ float f;
+ f = Pt.r + Pt.g + Pt.b + Pt.a; fDir[0] += f * f;
+ f = Pt.r + Pt.g + Pt.b - Pt.a; fDir[1] += f * f;
+ f = Pt.r + Pt.g - Pt.b + Pt.a; fDir[2] += f * f;
+ f = Pt.r + Pt.g - Pt.b - Pt.a; fDir[3] += f * f;
+ f = Pt.r - Pt.g + Pt.b + Pt.a; fDir[4] += f * f;
+ f = Pt.r - Pt.g + Pt.b - Pt.a; fDir[5] += f * f;
+ f = Pt.r - Pt.g - Pt.b + Pt.a; fDir[6] += f * f;
+ f = Pt.r - Pt.g - Pt.b - Pt.a; fDir[7] += f * f;
+ }
+
+ float fDirMax = fDir[0];
+ size_t iDirMax = 0;
+
+ for(size_t iDir = 1; iDir < 8; iDir++)
+ {
+ if(fDir[iDir] > fDirMax)
+ {
+ fDirMax = fDir[iDir];
+ iDirMax = iDir;
+ }
+ }
+
+ if(iDirMax & 4) Swap(X.g, Y.g);
+ if(iDirMax & 2) Swap(X.b, Y.b);
+ if(iDirMax & 1) Swap(X.a, Y.a);
+
+ // Two color block.. no need to root-find
+ if(fAB < 1.0f / 4096.0f)
+ {
+ *pX = X;
+ *pY = Y;
+ return 0.0f;
+ }
+
+ // Use Newton's Method to find local minima of sum-of-squares error.
+ float fSteps = (float) (cSteps - 1);
+
+ for(size_t iIteration = 0; iIteration < 8 && fError > 0.0f; iIteration++)
+ {
+ // Calculate new steps
+ HDRColorA pSteps[BC7_MAX_INDICES];
+
+ LDRColorA aSteps[BC7_MAX_INDICES];
+ LDRColorA lX, lY;
+ lX = (X * 255.0f).ToLDRColorA();
+ lY = (Y * 255.0f).ToLDRColorA();
+
+ for(size_t iStep = 0; iStep < cSteps; iStep++)
+ {
+ pSteps[iStep] = X * pC[iStep] + Y * pD[iStep];
+ //LDRColorA::Interpolate(lX, lY, i, i, wcprec, waprec, aSteps[i]);
+ }
+
+ // Calculate color direction
+ Dir = Y - X;
+ float fLen = Dir * Dir;
+ if(fLen < (1.0f / 4096.0f))
+ break;
+
+ float fScale = fSteps / fLen;
+ Dir *= fScale;
+
+ // Evaluate function, and derivatives
+ float d2X = 0.0f, d2Y = 0.0f;
+ HDRColorA dX(0.0f, 0.0f, 0.0f, 0.0f), dY(0.0f, 0.0f, 0.0f, 0.0f);
+
+ for(size_t iPoint = 0; iPoint < cPixels; ++iPoint)
+ {
+ float fDot = (pPoints[pIndex[iPoint]] - X) * Dir;
+ size_t iStep;
+ if(fDot <= 0.0f)
+ iStep = 0;
+ if(fDot >= fSteps)
+ iStep = cSteps - 1;
+ else
+ iStep = size_t(fDot + 0.5f);
+
+ HDRColorA Diff = pSteps[iStep] - pPoints[pIndex[iPoint]];
+ float fC = pC[iStep] * (1.0f / 8.0f);
+ float fD = pD[iStep] * (1.0f / 8.0f);
+
+ d2X += fC * pC[iStep];
+ dX += Diff * fC;
+
+ d2Y += fD * pD[iStep];
+ dY += Diff * fD;
+ }
+
+ // Move endpoints
+ if(d2X > 0.0f)
+ {
+ float f = -1.0f / d2X;
+ X += dX * f;
+ }
+
+ if(d2Y > 0.0f)
+ {
+ float f = -1.0f / d2Y;
+ Y += dY * f;
+ }
+
+ if((dX * dX < fEpsilon) && (dY * dY < fEpsilon))
+ break;
+ }
+
+ *pX = X;
+ *pY = Y;
+ return fError;
+}
+
+
+//-------------------------------------------------------------------------------------
+#pragma warning(disable: 4616 6001 6297)
+
+static float ComputeError(_Inout_ const LDRColorA& pixel, _In_count_x_(1 << uIndexPrec) const LDRColorA aPalette[],
+ _In_ uint8_t uIndexPrec, _In_ uint8_t uIndexPrec2, _Out_opt_ size_t* pBestIndex = nullptr, _Out_opt_ size_t* pBestIndex2 = nullptr)
+{
+ const size_t uNumIndices = 1 << uIndexPrec;
+ const size_t uNumIndices2 = 1 << uIndexPrec2;
+ float fTotalErr = 0;
+ float fBestErr = FLT_MAX;
+
+ if(pBestIndex)
+ *pBestIndex = 0;
+ if(pBestIndex2)
+ *pBestIndex2 = 0;
+
+ if(uIndexPrec2 == 0)
+ {
+ for(register size_t i = 0; i < uNumIndices && fBestErr > 0; i++)
+ {
+ float fErr = ErrorMetric(pixel, aPalette[i]);
+ if(fErr > fBestErr) // error increased, so we're done searching
+ break;
+ if(fErr < fBestErr)
+ {
+ fBestErr = fErr;
+ if(pBestIndex)
+ *pBestIndex = i;
+ }
+ }
+ fTotalErr += fBestErr;
+ }
+ else
+ {
+ for(register size_t i = 0; i < uNumIndices && fBestErr > 0; i++)
+ {
+ float fErr = ErrorMetricRGB(pixel, aPalette[i]);
+ if(fErr > fBestErr) // error increased, so we're done searching
+ break;
+ if(fErr < fBestErr)
+ {
+ fBestErr = fErr;
+ if(pBestIndex)
+ *pBestIndex = i;
+ }
+ }
+ fTotalErr += fBestErr;
+ fBestErr = FLT_MAX;
+ for(register size_t i = 0; i < uNumIndices2 && fBestErr > 0; i++)
+ {
+ float fErr = ErrorMetricAlpha(pixel, aPalette[i]);
+ if(fErr > fBestErr) // error increased, so we're done searching
+ break;
+ if(fErr < fBestErr)
+ {
+ fBestErr = fErr;
+ if(pBestIndex2)
+ *pBestIndex2 = i;
+ }
+ }
+ fTotalErr += fBestErr;
+ }
+
+ return fTotalErr;
+}
+
+
+inline static void FillWithErrorColors( _Out_cap_c_(NUM_PIXELS_PER_BLOCK) HDRColorA* pOut )
+{
+ for(size_t i = 0; i < NUM_PIXELS_PER_BLOCK; ++i)
+ {
+#ifdef _DEBUG
+ // Use Magenta in debug as a highly-visible error color
+ pOut[i] = HDRColorA(1.0f, 0.0f, 1.0f, 1.0f);
+#else
+ // In production use, default to black
+ pOut[i] = HDRColorA(0.0f, 0.0f, 0.0f, 1.0f);
+#endif
+ }
+}
+
+
+//-------------------------------------------------------------------------------------
+// BC6H Compression
+//-------------------------------------------------------------------------------------
+void D3DX_BC6H::Decode(bool bSigned, HDRColorA* pOut) const
+{
+ assert(pOut );
+
+ size_t uStartBit = 0;
+ uint8_t uMode = GetBits(uStartBit, 2);
+ if(uMode != 0x00 && uMode != 0x01)
+ {
+ uMode = (GetBits(uStartBit, 3) << 2) | uMode;
+ }
+
+ assert( uMode < 32 );
+ __analysis_assume( uMode < 32 );
+
+ if ( ms_aModeToInfo[uMode] >= 0 )
+ {
+ assert(ms_aModeToInfo[uMode] < ARRAYSIZE(ms_aInfo));
+ __analysis_assume(ms_aModeToInfo[uMode] < ARRAYSIZE(ms_aInfo));
+ const ModeDescriptor* desc = ms_aDesc[ms_aModeToInfo[uMode]];
+
+ assert(ms_aModeToInfo[uMode] < ARRAYSIZE(ms_aDesc));
+ __analysis_assume(ms_aModeToInfo[uMode] < ARRAYSIZE(ms_aDesc));
+ const ModeInfo& info = ms_aInfo[ms_aModeToInfo[uMode]];
+
+ INTEndPntPair aEndPts[BC6H_MAX_REGIONS];
+ memset(aEndPts, 0, BC6H_MAX_REGIONS * 2 * sizeof(INTColor));
+ uint32_t uShape = 0;
+
+ // Read header
+ const size_t uHeaderBits = info.uPartitions > 0 ? 82 : 65;
+ while(uStartBit < uHeaderBits)
+ {
+ size_t uCurBit = uStartBit;
+ if(GetBit(uStartBit))
+ {
+ switch(desc[uCurBit].m_eField)
+ {
+ case D: uShape |= 1 << uint32_t(desc[uCurBit].m_uBit); break;
+ case RW: aEndPts[0].A.r |= 1 << uint32_t(desc[uCurBit].m_uBit); break;
+ case RX: aEndPts[0].B.r |= 1 << uint32_t(desc[uCurBit].m_uBit); break;
+ case RY: aEndPts[1].A.r |= 1 << uint32_t(desc[uCurBit].m_uBit); break;
+ case RZ: aEndPts[1].B.r |= 1 << uint32_t(desc[uCurBit].m_uBit); break;
+ case GW: aEndPts[0].A.g |= 1 << uint32_t(desc[uCurBit].m_uBit); break;
+ case GX: aEndPts[0].B.g |= 1 << uint32_t(desc[uCurBit].m_uBit); break;
+ case GY: aEndPts[1].A.g |= 1 << uint32_t(desc[uCurBit].m_uBit); break;
+ case GZ: aEndPts[1].B.g |= 1 << uint32_t(desc[uCurBit].m_uBit); break;
+ case BW: aEndPts[0].A.b |= 1 << uint32_t(desc[uCurBit].m_uBit); break;
+ case BX: aEndPts[0].B.b |= 1 << uint32_t(desc[uCurBit].m_uBit); break;
+ case BY: aEndPts[1].A.b |= 1 << uint32_t(desc[uCurBit].m_uBit); break;
+ case BZ: aEndPts[1].B.b |= 1 << uint32_t(desc[uCurBit].m_uBit); break;
+ default:
+ {
+#ifdef _DEBUG
+ OutputDebugStringA( "BC6H: Invalid header bits encountered during decoding\n" );
+#endif
+ FillWithErrorColors( pOut );
+ return;
+ }
+ }
+ }
+ }
+
+ assert( uShape < 64 );
+ __analysis_assume( uShape < 64 );
+
+ // Sign extend necessary end points
+ if(bSigned)
+ {
+ aEndPts[0].A.SignExtend(info.RGBAPrec[0][0]);
+ }
+ if(bSigned || info.bTransformed)
+ {
+ assert( info.uPartitions < BC6H_MAX_REGIONS );
+ __analysis_assume( info.uPartitions < BC6H_MAX_REGIONS );
+ for(size_t p = 0; p <= info.uPartitions; ++p)
+ {
+ if(p != 0)
+ {
+ aEndPts[p].A.SignExtend(info.RGBAPrec[p][0]);
+ }
+ aEndPts[p].B.SignExtend(info.RGBAPrec[p][1]);
+ }
+ }
+
+ // Inverse transform the end points
+ if(info.bTransformed)
+ {
+ TransformInverse(aEndPts, info.RGBAPrec[0][0], bSigned);
+ }
+
+ // Read indices
+ for(size_t i = 0; i < NUM_PIXELS_PER_BLOCK; ++i)
+ {
+ size_t uNumBits = IsFixUpOffset(info.uPartitions, uShape, i) ? info.uIndexPrec-1 : info.uIndexPrec;
+ if ( uStartBit + uNumBits > 128 )
+ {
+#ifdef _DEBUG
+ OutputDebugStringA( "BC6H: Invalid block encountered during decoding\n" );
+#endif
+ FillWithErrorColors( pOut );
+ return;
+ }
+ uint8_t uIndex = GetBits(uStartBit, uNumBits);
+
+ if ( uIndex >= ((info.uPartitions > 0) ? 8 : 16) )
+ {
+#ifdef _DEBUG
+ OutputDebugStringA( "BC6H: Invalid index encountered during decoding\n" );
+#endif
+ FillWithErrorColors( pOut );
+ return;
+ }
+
+ size_t uRegion = g_aPartitionTable[info.uPartitions][uShape][i];
+ assert( uRegion < BC6H_MAX_REGIONS );
+ __analysis_assume( uRegion < BC6H_MAX_REGIONS );
+
+ // Unquantize endpoints and interpolate
+ int r1 = Unquantize(aEndPts[uRegion].A.r, info.RGBAPrec[0][0].r, bSigned);
+ int g1 = Unquantize(aEndPts[uRegion].A.g, info.RGBAPrec[0][0].g, bSigned);
+ int b1 = Unquantize(aEndPts[uRegion].A.b, info.RGBAPrec[0][0].b, bSigned);
+ int r2 = Unquantize(aEndPts[uRegion].B.r, info.RGBAPrec[0][0].r, bSigned);
+ int g2 = Unquantize(aEndPts[uRegion].B.g, info.RGBAPrec[0][0].g, bSigned);
+ int b2 = Unquantize(aEndPts[uRegion].B.b, info.RGBAPrec[0][0].b, bSigned);
+ const int* aWeights = info.uPartitions > 0 ? g_aWeights3 : g_aWeights4;
+ INTColor fc;
+ fc.r = FinishUnquantize((r1 * (BC67_WEIGHT_MAX - aWeights[uIndex]) + r2 * aWeights[uIndex] + BC67_WEIGHT_ROUND) >> BC67_WEIGHT_SHIFT, bSigned);
+ fc.g = FinishUnquantize((g1 * (BC67_WEIGHT_MAX - aWeights[uIndex]) + g2 * aWeights[uIndex] + BC67_WEIGHT_ROUND) >> BC67_WEIGHT_SHIFT, bSigned);
+ fc.b = FinishUnquantize((b1 * (BC67_WEIGHT_MAX - aWeights[uIndex]) + b2 * aWeights[uIndex] + BC67_WEIGHT_ROUND) >> BC67_WEIGHT_SHIFT, bSigned);
+
+ HALF rgb[3];
+ fc.ToF16(rgb, bSigned);
+
+ pOut[i].r = XMConvertHalfToFloat( rgb[0] );
+ pOut[i].g = XMConvertHalfToFloat( rgb[1] );
+ pOut[i].b = XMConvertHalfToFloat( rgb[2] );
+ pOut[i].a = 1.0f;
+ }
+ }
+ else
+ {
+#ifdef _DEBUG
+ OutputDebugStringA( "BC6H: Invalid mode encountered during decoding\n" );
+#endif
+ FillWithErrorColors( pOut );
+ }
+}
+
+void D3DX_BC6H::Encode(bool bSigned, const HDRColorA* const pIn)
+{
+ assert( pIn );
+
+ EncodeParams EP(pIn, bSigned);
+
+ for(EP.uMode = 0; EP.uMode < ARRAYSIZE(ms_aInfo) && EP.fBestErr > 0; ++EP.uMode)
+ {
+ const uint8_t uShapes = ms_aInfo[EP.uMode].uPartitions ? 32 : 1;
+ // Number of rough cases to look at. reasonable values of this are 1, uShapes/4, and uShapes
+ // uShapes/4 gets nearly all the cases; you can increase that a bit (say by 3 or 4) if you really want to squeeze the last bit out
+ const size_t uItems = std::max<size_t>(1, uShapes >> 2);
+ float afRoughMSE[BC6H_MAX_SHAPES];
+ uint8_t auShape[BC6H_MAX_SHAPES];
+
+ // pick the best uItems shapes and refine these.
+ for(EP.uShape = 0; EP.uShape < uShapes; ++EP.uShape)
+ {
+ size_t uShape = EP.uShape;
+ afRoughMSE[uShape] = RoughMSE(&EP);
+ auShape[uShape] = static_cast<uint8_t>(uShape);
+ }
+
+ // Bubble up the first uItems items
+ for(register size_t i = 0; i < uItems; i++)
+ {
+ for(register size_t j = i + 1; j < uShapes; j++)
+ {
+ if(afRoughMSE[i] > afRoughMSE[j])
+ {
+ Swap(afRoughMSE[i], afRoughMSE[j]);
+ Swap(auShape[i], auShape[j]);
+ }
+ }
+ }
+
+ for(size_t i = 0; i < uItems && EP.fBestErr > 0; i++)
+ {
+ EP.uShape = auShape[i];
+ Refine(&EP);
+ }
+ }
+}
+
+
+//-------------------------------------------------------------------------------------
+int D3DX_BC6H::Quantize(int iValue, int prec, bool bSigned)
+{
+ assert(prec > 1); // didn't bother to make it work for 1
+ int q, s = 0;
+ if(bSigned)
+ {
+ assert(iValue >= -F16MAX && iValue <= F16MAX);
+ if(iValue < 0)
+ {
+ s = 1;
+ iValue = -iValue;
+ }
+ q = (prec >= 16) ? iValue : (iValue << (prec-1)) / (F16MAX+1);
+ if(s)
+ q = -q;
+ assert (q > -(1 << (prec-1)) && q < (1 << (prec-1)));
+ }
+ else
+ {
+ assert(iValue >= 0 && iValue <= F16MAX);
+ q = (prec >= 15) ? iValue : (iValue << prec) / (F16MAX+1);
+ assert (q >= 0 && q < (1 << prec));
+ }
+
+ return q;
+}
+
+int D3DX_BC6H::Unquantize(int comp, uint8_t uBitsPerComp, bool bSigned)
+{
+ int unq = 0, s = 0;
+ if(bSigned)
+ {
+ if(uBitsPerComp >= 16)
+ {
+ unq = comp;
+ }
+ else
+ {
+ if(comp < 0)
+ {
+ s = 1;
+ comp = -comp;
+ }
+
+ if(comp == 0) unq = 0;
+ else if(comp >= ((1 << (uBitsPerComp - 1)) - 1)) unq = 0x7FFF;
+ else unq = ((comp << 15) + 0x4000) >> (uBitsPerComp-1);
+
+ if(s) unq = -unq;
+ }
+ }
+ else
+ {
+ if(uBitsPerComp >= 15) unq = comp;
+ else if(comp == 0) unq = 0;
+ else if(comp == ((1 << uBitsPerComp) - 1)) unq = 0xFFFF;
+ else unq = ((comp << 16) + 0x8000) >> uBitsPerComp;
+ }
+
+ return unq;
+}
+
+int D3DX_BC6H::FinishUnquantize(int comp, bool bSigned)
+{
+ if(bSigned)
+ {
+ return (comp < 0) ? -(((-comp) * 31) >> 5) : (comp * 31) >> 5; // scale the magnitude by 31/32
+ }
+ else
+ {
+ return (comp * 31) >> 6; // scale the magnitude by 31/64
+ }
+}
+
+
+//-------------------------------------------------------------------------------------
+bool D3DX_BC6H::EndPointsFit(const EncodeParams* pEP, const INTEndPntPair aEndPts[])
+{
+ assert( pEP );
+ const bool bTransformed = ms_aInfo[pEP->uMode].bTransformed;
+ const bool bIsSigned = pEP->bSigned;
+ const LDRColorA& Prec0 = ms_aInfo[pEP->uMode].RGBAPrec[0][0];
+ const LDRColorA& Prec1 = ms_aInfo[pEP->uMode].RGBAPrec[0][1];
+ const LDRColorA& Prec2 = ms_aInfo[pEP->uMode].RGBAPrec[1][0];
+ const LDRColorA& Prec3 = ms_aInfo[pEP->uMode].RGBAPrec[1][1];
+
+ INTColor aBits[4];
+ aBits[0].r = NBits(aEndPts[0].A.r, bIsSigned);
+ aBits[0].g = NBits(aEndPts[0].A.g, bIsSigned);
+ aBits[0].b = NBits(aEndPts[0].A.b, bIsSigned);
+ aBits[1].r = NBits(aEndPts[0].B.r, bTransformed || bIsSigned);
+ aBits[1].g = NBits(aEndPts[0].B.g, bTransformed || bIsSigned);
+ aBits[1].b = NBits(aEndPts[0].B.b, bTransformed || bIsSigned);
+ if(aBits[0].r > Prec0.r || aBits[1].r > Prec1.r ||
+ aBits[0].g > Prec0.g || aBits[1].g > Prec1.g ||
+ aBits[0].b > Prec0.b || aBits[1].b > Prec1.b)
+ return false;
+
+ if(ms_aInfo[pEP->uMode].uPartitions)
+ {
+ aBits[2].r = NBits(aEndPts[1].A.r, bTransformed || bIsSigned);
+ aBits[2].g = NBits(aEndPts[1].A.g, bTransformed || bIsSigned);
+ aBits[2].b = NBits(aEndPts[1].A.b, bTransformed || bIsSigned);
+ aBits[3].r = NBits(aEndPts[1].B.r, bTransformed || bIsSigned);
+ aBits[3].g = NBits(aEndPts[1].B.g, bTransformed || bIsSigned);
+ aBits[3].b = NBits(aEndPts[1].B.b, bTransformed || bIsSigned);
+
+ if(aBits[2].r > Prec2.r || aBits[3].r > Prec3.r ||
+ aBits[2].g > Prec2.g || aBits[3].g > Prec3.g ||
+ aBits[2].b > Prec2.b || aBits[3].b > Prec3.b)
+ return false;
+ }
+
+ return true;
+}
+
+void D3DX_BC6H::GeneratePaletteQuantized(const EncodeParams* pEP, const INTEndPntPair& endPts, INTColor aPalette[]) const
+{
+ assert( pEP );
+ const size_t uIndexPrec = ms_aInfo[pEP->uMode].uIndexPrec;
+ const size_t uNumIndices = 1 << uIndexPrec;
+ assert( uNumIndices > 0 );
+ __analysis_assume( uNumIndices > 0 );
+ const LDRColorA& Prec = ms_aInfo[pEP->uMode].RGBAPrec[0][0];
+
+ // scale endpoints
+ INTEndPntPair unqEndPts;
+ unqEndPts.A.r = Unquantize(endPts.A.r, Prec.r, pEP->bSigned);
+ unqEndPts.A.g = Unquantize(endPts.A.g, Prec.g, pEP->bSigned);
+ unqEndPts.A.b = Unquantize(endPts.A.b, Prec.b, pEP->bSigned);
+ unqEndPts.B.r = Unquantize(endPts.B.r, Prec.r, pEP->bSigned);
+ unqEndPts.B.g = Unquantize(endPts.B.g, Prec.g, pEP->bSigned);
+ unqEndPts.B.b = Unquantize(endPts.B.b, Prec.b, pEP->bSigned);
+
+ // interpolate
+ const int* aWeights = nullptr;
+ switch(uIndexPrec)
+ {
+ case 3: aWeights = g_aWeights3; assert(uNumIndices <= 8); __analysis_assume(uNumIndices <= 8); break;
+ case 4: aWeights = g_aWeights4; assert(uNumIndices <= 16); __analysis_assume(uNumIndices <= 16); break;
+ default: assert(false); for(size_t i=0; i < uNumIndices; ++i) aPalette[i] = INTColor(0,0,0); return;
+ }
+
+ for (size_t i = 0; i < uNumIndices; ++i)
+ {
+ aPalette[i].r = FinishUnquantize(
+ (unqEndPts.A.r * (BC67_WEIGHT_MAX - aWeights[i]) + unqEndPts.B.r * aWeights[i] + BC67_WEIGHT_ROUND) >> BC67_WEIGHT_SHIFT,
+ pEP->bSigned);
+ aPalette[i].g = FinishUnquantize(
+ (unqEndPts.A.g * (BC67_WEIGHT_MAX - aWeights[i]) + unqEndPts.B.g * aWeights[i] + BC67_WEIGHT_ROUND) >> BC67_WEIGHT_SHIFT,
+ pEP->bSigned);
+ aPalette[i].b = FinishUnquantize(
+ (unqEndPts.A.b * (BC67_WEIGHT_MAX - aWeights[i]) + unqEndPts.B.b * aWeights[i] + BC67_WEIGHT_ROUND) >> BC67_WEIGHT_SHIFT,
+ pEP->bSigned);
+ }
+}
+
+// given a collection of colors and quantized endpoints, generate a palette, choose best entries, and return a single toterr
+float D3DX_BC6H::MapColorsQuantized(const EncodeParams* pEP, const INTColor aColors[], size_t np, const INTEndPntPair &endPts) const
+{
+ assert( pEP );
+
+ const uint8_t uIndexPrec = ms_aInfo[pEP->uMode].uIndexPrec;
+ const uint8_t uNumIndices = 1 << uIndexPrec;
+ INTColor aPalette[BC6H_MAX_INDICES];
+ GeneratePaletteQuantized(pEP, endPts, aPalette);
+
+ float fTotErr = 0;
+ for(size_t i = 0; i < np; ++i)
+ {
+ float fBestErr = Norm(aColors[i], aPalette[0]);
+ for(int j = 1; j < uNumIndices && fBestErr > 0; ++j)
+ {
+ float fErr = Norm(aColors[i], aPalette[j]);
+ if(fErr > fBestErr) break; // error increased, so we're done searching
+ if(fErr < fBestErr) fBestErr = fErr;
+ }
+ fTotErr += fBestErr;
+ }
+ return fTotErr;
+}
+
+float D3DX_BC6H::PerturbOne(const EncodeParams* pEP, const INTColor aColors[], size_t np, uint8_t ch,
+ const INTEndPntPair& oldEndPts, INTEndPntPair& newEndPts, float fOldErr, int do_b) const
+{
+ assert( pEP );
+ uint8_t uPrec;
+ switch(ch)
+ {
+ case 0: uPrec = ms_aInfo[pEP->uMode].RGBAPrec[0][0].r; break;
+ case 1: uPrec = ms_aInfo[pEP->uMode].RGBAPrec[0][0].g; break;
+ case 2: uPrec = ms_aInfo[pEP->uMode].RGBAPrec[0][0].b; break;
+ default: assert(false); newEndPts = oldEndPts; return FLT_MAX;
+ }
+ INTEndPntPair tmpEndPts;
+ float fMinErr = fOldErr;
+ int beststep = 0;
+
+ // copy real endpoints so we can perturb them
+ tmpEndPts = newEndPts = oldEndPts;
+
+ // do a logarithmic search for the best error for this endpoint (which)
+ for(int step = 1 << (uPrec-1); step; step >>= 1)
+ {
+ bool bImproved = false;
+ for(int sign = -1; sign <= 1; sign += 2)
+ {
+ if(do_b == 0)
+ {
+ tmpEndPts.A[ch] = newEndPts.A[ch] + sign * step;
+ if(tmpEndPts.A[ch] < 0 || tmpEndPts.A[ch] >= (1 << uPrec))
+ continue;
+ }
+ else
+ {
+ tmpEndPts.B[ch] = newEndPts.B[ch] + sign * step;
+ if(tmpEndPts.B[ch] < 0 || tmpEndPts.B[ch] >= (1 << uPrec))
+ continue;
+ }
+
+ float fErr = MapColorsQuantized(pEP, aColors, np, tmpEndPts);
+
+ if(fErr < fMinErr)
+ {
+ bImproved = true;
+ fMinErr = fErr;
+ beststep = sign * step;
+ }
+ }
+ // if this was an improvement, move the endpoint and continue search from there
+ if(bImproved)
+ {
+ if(do_b == 0)
+ newEndPts.A[ch] += beststep;
+ else
+ newEndPts.B[ch] += beststep;
+ }
+ }
+ return fMinErr;
+}
+
+void D3DX_BC6H::OptimizeOne(const EncodeParams* pEP, const INTColor aColors[], size_t np, float aOrgErr,
+ const INTEndPntPair &aOrgEndPts, INTEndPntPair &aOptEndPts) const
+{
+ assert( pEP );
+ float aOptErr = aOrgErr;
+ aOptEndPts.A = aOrgEndPts.A;
+ aOptEndPts.B = aOrgEndPts.B;
+
+ INTEndPntPair new_a, new_b;
+ INTEndPntPair newEndPts;
+ int do_b;
+
+ // now optimize each channel separately
+ for(uint8_t ch = 0; ch < 3; ++ch)
+ {
+ // figure out which endpoint when perturbed gives the most improvement and start there
+ // if we just alternate, we can easily end up in a local minima
+ float fErr0 = PerturbOne(pEP, aColors, np, ch, aOptEndPts, new_a, aOptErr, 0); // perturb endpt A
+ float fErr1 = PerturbOne(pEP, aColors, np, ch, aOptEndPts, new_b, aOptErr, 1); // perturb endpt B
+
+ if(fErr0 < fErr1)
+ {
+ if(fErr0 >= aOptErr) continue;
+ aOptEndPts.A[ch] = new_a.A[ch];
+ aOptErr = fErr0;
+ do_b = 1; // do B next
+ }
+ else
+ {
+ if(fErr1 >= aOptErr) continue;
+ aOptEndPts.B[ch] = new_b.B[ch];
+ aOptErr = fErr1;
+ do_b = 0; // do A next
+ }
+
+ // now alternate endpoints and keep trying until there is no improvement
+ for(;;)
+ {
+ float fErr = PerturbOne(pEP, aColors, np, ch, aOptEndPts, newEndPts, aOptErr, do_b);
+ if(fErr >= aOptErr)
+ break;
+ if(do_b == 0)
+ aOptEndPts.A[ch] = newEndPts.A[ch];
+ else
+ aOptEndPts.B[ch] = newEndPts.B[ch];
+ aOptErr = fErr;
+ do_b = 1 - do_b; // now move the other endpoint
+ }
+ }
+}
+
+void D3DX_BC6H::OptimizeEndPoints(const EncodeParams* pEP, const float aOrgErr[], const INTEndPntPair aOrgEndPts[], INTEndPntPair aOptEndPts[]) const
+{
+ assert( pEP );
+ const uint8_t uPartitions = ms_aInfo[pEP->uMode].uPartitions;
+ assert( uPartitions < BC6H_MAX_REGIONS );
+ __analysis_assume( uPartitions < BC6H_MAX_REGIONS );
+ INTColor aPixels[NUM_PIXELS_PER_BLOCK];
+
+ for(size_t p = 0; p <= uPartitions; ++p)
+ {
+ // collect the pixels in the region
+ size_t np = 0;
+ for(size_t i = 0; i < NUM_PIXELS_PER_BLOCK; ++i)
+ {
+ if(g_aPartitionTable[p][pEP->uShape][i] == p)
+ {
+ aPixels[np++] = pEP->aIPixels[i];
+ }
+ }
+
+ OptimizeOne(pEP, aPixels, np, aOrgErr[p], aOrgEndPts[p], aOptEndPts[p]);
+ }
+}
+
+// Swap endpoints as needed to ensure that the indices at fix up have a 0 high-order bit
+void D3DX_BC6H::SwapIndices(const EncodeParams* pEP, INTEndPntPair aEndPts[], size_t aIndices[])
+{
+ assert( pEP );
+ const size_t uPartitions = ms_aInfo[pEP->uMode].uPartitions;
+ const size_t uNumIndices = 1 << ms_aInfo[pEP->uMode].uIndexPrec;
+ const size_t uHighIndexBit = uNumIndices >> 1;
+
+ assert( uPartitions < BC6H_MAX_REGIONS && pEP->uShape < BC6H_MAX_SHAPES );
+ __analysis_assume( uPartitions < BC6H_MAX_REGIONS && pEP->uShape < BC6H_MAX_SHAPES );
+
+ for(size_t p = 0; p <= uPartitions; ++p)
+ {
+ size_t i = g_aFixUp[uPartitions][pEP->uShape][p];
+ assert(g_aPartitionTable[uPartitions][pEP->uShape][i] == p);
+ if(aIndices[i] & uHighIndexBit)
+ {
+ // high bit is set, swap the aEndPts and indices for this region
+ Swap(aEndPts[p].A, aEndPts[p].B);
+
+ for(size_t j = 0; j < NUM_PIXELS_PER_BLOCK; ++j)
+ if(g_aPartitionTable[uPartitions][pEP->uShape][j] == p)
+ aIndices[j] = uNumIndices - 1 - aIndices[j];
+ }
+ }
+}
+
+// assign indices given a tile, shape, and quantized endpoints, return toterr for each region
+void D3DX_BC6H::AssignIndices(const EncodeParams* pEP, const INTEndPntPair aEndPts[], size_t aIndices[], float aTotErr[]) const
+{
+ assert( pEP );
+ const uint8_t uPartitions = ms_aInfo[pEP->uMode].uPartitions;
+ const uint8_t uNumIndices = 1 << ms_aInfo[pEP->uMode].uIndexPrec;
+
+ assert( uPartitions < BC6H_MAX_REGIONS && pEP->uShape < BC6H_MAX_SHAPES );
+ __analysis_assume( uPartitions < BC6H_MAX_REGIONS && pEP->uShape < BC6H_MAX_SHAPES );
+
+ // build list of possibles
+ INTColor aPalette[BC6H_MAX_REGIONS][BC6H_MAX_INDICES];
+
+ for(size_t p = 0; p <= uPartitions; ++p)
+ {
+ GeneratePaletteQuantized(pEP, aEndPts[p], aPalette[p]);
+ aTotErr[p] = 0;
+ }
+
+ for(size_t i = 0; i < NUM_PIXELS_PER_BLOCK; ++i)
+ {
+ const uint8_t uRegion = g_aPartitionTable[uPartitions][pEP->uShape][i];
+ assert( uRegion < BC6H_MAX_REGIONS );
+ __analysis_assume( uRegion < BC6H_MAX_REGIONS );
+ float fBestErr = Norm(pEP->aIPixels[i], aPalette[uRegion][0]);
+ aIndices[i] = 0;
+
+ for(uint8_t j = 1; j < uNumIndices && fBestErr > 0; ++j)
+ {
+ float fErr = Norm(pEP->aIPixels[i], aPalette[uRegion][j]);
+ if(fErr > fBestErr) break; // error increased, so we're done searching
+ if(fErr < fBestErr)
+ {
+ fBestErr = fErr;
+ aIndices[i] = j;
+ }
+ }
+ aTotErr[uRegion] += fBestErr;
+ }
+}
+
+void D3DX_BC6H::QuantizeEndPts(const EncodeParams* pEP, INTEndPntPair* aQntEndPts) const
+{
+ assert( pEP && aQntEndPts );
+ const INTEndPntPair* aUnqEndPts = pEP->aUnqEndPts[pEP->uShape];
+ const LDRColorA& Prec = ms_aInfo[pEP->uMode].RGBAPrec[0][0];
+ const uint8_t uPartitions = ms_aInfo[pEP->uMode].uPartitions;
+ assert( uPartitions < BC6H_MAX_REGIONS );
+ __analysis_assume( uPartitions < BC6H_MAX_REGIONS );
+
+ for(size_t p = 0; p <= uPartitions; ++p)
+ {
+ aQntEndPts[p].A.r = Quantize(aUnqEndPts[p].A.r, Prec.r, pEP->bSigned);
+ aQntEndPts[p].A.g = Quantize(aUnqEndPts[p].A.g, Prec.g, pEP->bSigned);
+ aQntEndPts[p].A.b = Quantize(aUnqEndPts[p].A.b, Prec.b, pEP->bSigned);
+ aQntEndPts[p].B.r = Quantize(aUnqEndPts[p].B.r, Prec.r, pEP->bSigned);
+ aQntEndPts[p].B.g = Quantize(aUnqEndPts[p].B.g, Prec.g, pEP->bSigned);
+ aQntEndPts[p].B.b = Quantize(aUnqEndPts[p].B.b, Prec.b, pEP->bSigned);
+ }
+}
+
+void D3DX_BC6H::EmitBlock(const EncodeParams* pEP, const INTEndPntPair aEndPts[], const size_t aIndices[])
+{
+ assert( pEP );
+ const uint8_t uRealMode = ms_aInfo[pEP->uMode].uMode;
+ const uint8_t uPartitions = ms_aInfo[pEP->uMode].uPartitions;
+ const uint8_t uIndexPrec = ms_aInfo[pEP->uMode].uIndexPrec;
+ const size_t uHeaderBits = uPartitions > 0 ? 82 : 65;
+ const ModeDescriptor* desc = ms_aDesc[pEP->uMode];
+ size_t uStartBit = 0;
+
+ while(uStartBit < uHeaderBits)
+ {
+ switch(desc[uStartBit].m_eField)
+ {
+ case M: SetBit(uStartBit, uint8_t(uRealMode >> desc[uStartBit].m_uBit) & 0x01); break;
+ case D: SetBit(uStartBit, uint8_t(pEP->uShape >> desc[uStartBit].m_uBit) & 0x01); break;
+ case RW: SetBit(uStartBit, uint8_t(aEndPts[0].A.r >> desc[uStartBit].m_uBit) & 0x01); break;
+ case RX: SetBit(uStartBit, uint8_t(aEndPts[0].B.r >> desc[uStartBit].m_uBit) & 0x01); break;
+ case RY: SetBit(uStartBit, uint8_t(aEndPts[1].A.r >> desc[uStartBit].m_uBit) & 0x01); break;
+ case RZ: SetBit(uStartBit, uint8_t(aEndPts[1].B.r >> desc[uStartBit].m_uBit) & 0x01); break;
+ case GW: SetBit(uStartBit, uint8_t(aEndPts[0].A.g >> desc[uStartBit].m_uBit) & 0x01); break;
+ case GX: SetBit(uStartBit, uint8_t(aEndPts[0].B.g >> desc[uStartBit].m_uBit) & 0x01); break;
+ case GY: SetBit(uStartBit, uint8_t(aEndPts[1].A.g >> desc[uStartBit].m_uBit) & 0x01); break;
+ case GZ: SetBit(uStartBit, uint8_t(aEndPts[1].B.g >> desc[uStartBit].m_uBit) & 0x01); break;
+ case BW: SetBit(uStartBit, uint8_t(aEndPts[0].A.b >> desc[uStartBit].m_uBit) & 0x01); break;
+ case BX: SetBit(uStartBit, uint8_t(aEndPts[0].B.b >> desc[uStartBit].m_uBit) & 0x01); break;
+ case BY: SetBit(uStartBit, uint8_t(aEndPts[1].A.b >> desc[uStartBit].m_uBit) & 0x01); break;
+ case BZ: SetBit(uStartBit, uint8_t(aEndPts[1].B.b >> desc[uStartBit].m_uBit) & 0x01); break;
+ default: assert(false);
+ }
+ }
+
+ for(size_t i = 0; i < NUM_PIXELS_PER_BLOCK; ++i)
+ {
+ if(IsFixUpOffset(ms_aInfo[pEP->uMode].uPartitions, pEP->uShape, i))
+ SetBits(uStartBit, uIndexPrec - 1, static_cast<uint8_t>( aIndices[i] ));
+ else
+ SetBits(uStartBit, uIndexPrec, static_cast<uint8_t>( aIndices[i] ));
+ }
+ assert(uStartBit == 128);
+}
+
+void D3DX_BC6H::Refine(EncodeParams* pEP)
+{
+ assert( pEP );
+ const uint8_t uPartitions = ms_aInfo[pEP->uMode].uPartitions;
+ assert( uPartitions < BC6H_MAX_REGIONS );
+ __analysis_assume( uPartitions < BC6H_MAX_REGIONS );
+
+ const bool bTransformed = ms_aInfo[pEP->uMode].bTransformed;
+ float aOrgErr[BC6H_MAX_REGIONS], aOptErr[BC6H_MAX_REGIONS];
+ INTEndPntPair aOrgEndPts[BC6H_MAX_REGIONS], aOptEndPts[BC6H_MAX_REGIONS];
+ size_t aOrgIdx[NUM_PIXELS_PER_BLOCK], aOptIdx[NUM_PIXELS_PER_BLOCK];
+
+ QuantizeEndPts(pEP, aOrgEndPts);
+ AssignIndices(pEP, aOrgEndPts, aOrgIdx, aOrgErr);
+ SwapIndices(pEP, aOrgEndPts, aOrgIdx);
+
+ if(bTransformed) TransformForward(aOrgEndPts);
+ if(EndPointsFit(pEP, aOrgEndPts))
+ {
+ if(bTransformed) TransformInverse(aOrgEndPts, ms_aInfo[pEP->uMode].RGBAPrec[0][0], pEP->bSigned);
+ OptimizeEndPoints(pEP, aOrgErr, aOrgEndPts, aOptEndPts);
+ AssignIndices(pEP, aOptEndPts, aOptIdx, aOptErr);
+ SwapIndices(pEP, aOptEndPts, aOptIdx);
+
+ float fOrgTotErr = 0.0f, fOptTotErr = 0.0f;
+ for(size_t p = 0; p <= uPartitions; ++p)
+ {
+ fOrgTotErr += aOrgErr[p];
+ fOptTotErr += aOptErr[p];
+ }
+
+ if(bTransformed) TransformForward(aOptEndPts);
+ if(EndPointsFit(pEP, aOptEndPts) && fOptTotErr < fOrgTotErr && fOptTotErr < pEP->fBestErr)
+ {
+ pEP->fBestErr = fOptTotErr;
+ EmitBlock(pEP, aOptEndPts, aOptIdx);
+ }
+ else if(fOrgTotErr < pEP->fBestErr)
+ {
+ // either it stopped fitting when we optimized it, or there was no improvement
+ // so go back to the unoptimized endpoints which we know will fit
+ if(bTransformed) TransformForward(aOrgEndPts);
+ pEP->fBestErr = fOrgTotErr;
+ EmitBlock(pEP, aOrgEndPts, aOrgIdx);
+ }
+ }
+}
+
+void D3DX_BC6H::GeneratePaletteUnquantized(const EncodeParams* pEP, size_t uRegion, INTColor aPalette[])
+{
+ assert( pEP );
+ assert( uRegion < BC6H_MAX_REGIONS && pEP->uShape < BC6H_MAX_SHAPES );
+ __analysis_assume( uRegion < BC6H_MAX_REGIONS && pEP->uShape < BC6H_MAX_SHAPES );
+ const INTEndPntPair& endPts = pEP->aUnqEndPts[pEP->uShape][uRegion];
+ const uint8_t uIndexPrec = ms_aInfo[pEP->uMode].uIndexPrec;
+ const uint8_t uNumIndices = 1 << uIndexPrec;
+ assert( uNumIndices > 0 );
+ __analysis_assume( uNumIndices > 0 );
+
+ const int* aWeights = nullptr;
+ switch(uIndexPrec)
+ {
+ case 3: aWeights = g_aWeights3; assert(uNumIndices <= 8); __analysis_assume(uNumIndices <= 8); break;
+ case 4: aWeights = g_aWeights4; assert(uNumIndices <= 16); __analysis_assume(uNumIndices <= 16); break;
+ default: assert(false); for(size_t i = 0; i < uNumIndices; ++i) aPalette[i] = INTColor(0,0,0); return;
+ }
+
+ for(register size_t i = 0; i < uNumIndices; ++i)
+ {
+ aPalette[i].r = (endPts.A.r * (BC67_WEIGHT_MAX - aWeights[i]) + endPts.B.r * aWeights[i] + BC67_WEIGHT_ROUND) >> BC67_WEIGHT_SHIFT;
+ aPalette[i].g = (endPts.A.g * (BC67_WEIGHT_MAX - aWeights[i]) + endPts.B.g * aWeights[i] + BC67_WEIGHT_ROUND) >> BC67_WEIGHT_SHIFT;
+ aPalette[i].b = (endPts.A.b * (BC67_WEIGHT_MAX - aWeights[i]) + endPts.B.b * aWeights[i] + BC67_WEIGHT_ROUND) >> BC67_WEIGHT_SHIFT;
+ }
+}
+
+float D3DX_BC6H::MapColors(const EncodeParams* pEP, size_t uRegion, size_t np, const size_t* auIndex) const
+{
+ assert( pEP );
+ const uint8_t uIndexPrec = ms_aInfo[pEP->uMode].uIndexPrec;
+ const uint8_t uNumIndices = 1 << uIndexPrec;
+ INTColor aPalette[BC6H_MAX_INDICES];
+ GeneratePaletteUnquantized(pEP, uRegion, aPalette);
+
+ float fTotalErr = 0.0f;
+ for(size_t i = 0; i < np; ++i)
+ {
+ float fBestErr = Norm(pEP->aIPixels[auIndex[i]], aPalette[0]);
+ for(uint8_t j = 1; j < uNumIndices && fBestErr > 0.0f; ++j)
+ {
+ float fErr = Norm(pEP->aIPixels[auIndex[i]], aPalette[j]);
+ if(fErr > fBestErr) break; // error increased, so we're done searching
+ if(fErr < fBestErr) fBestErr = fErr;
+ }
+ fTotalErr += fBestErr;
+ }
+
+ return fTotalErr;
+}
+
+float D3DX_BC6H::RoughMSE(EncodeParams* pEP) const
+{
+ assert( pEP );
+ assert( pEP->uShape < BC6H_MAX_SHAPES);
+ __analysis_assume( pEP->uShape < BC6H_MAX_SHAPES);
+
+ INTEndPntPair* aEndPts = pEP->aUnqEndPts[pEP->uShape];
+
+ const uint8_t uPartitions = ms_aInfo[pEP->uMode].uPartitions;
+ assert( uPartitions < BC6H_MAX_REGIONS );
+ __analysis_assume( uPartitions < BC6H_MAX_REGIONS );
+
+ size_t auPixIdx[NUM_PIXELS_PER_BLOCK];
+
+ float fError = 0.0f;
+ for(size_t p = 0; p <= uPartitions; ++p)
+ {
+ size_t np = 0;
+ for(register size_t i = 0; i < NUM_PIXELS_PER_BLOCK; ++i)
+ {
+ if(g_aPartitionTable[uPartitions][pEP->uShape][i] == p)
+ {
+ auPixIdx[np++] = i;
+ }
+ }
+
+ // handle simple cases
+ assert(np > 0);
+ if(np == 1)
+ {
+ aEndPts[p].A = pEP->aIPixels[auPixIdx[0]];
+ aEndPts[p].B = pEP->aIPixels[auPixIdx[0]];
+ continue;
+ }
+ else if(np == 2)
+ {
+ aEndPts[p].A = pEP->aIPixels[auPixIdx[0]];
+ aEndPts[p].B = pEP->aIPixels[auPixIdx[1]];
+ continue;
+ }
+
+ HDRColorA epA, epB;
+ OptimizeRGB(pEP->aHDRPixels, &epA, &epB, 4, np, auPixIdx);
+ aEndPts[p].A.Set(epA, pEP->bSigned);
+ aEndPts[p].B.Set(epB, pEP->bSigned);
+ if(pEP->bSigned)
+ {
+ aEndPts[p].A.Clamp(-F16MAX, F16MAX);
+ aEndPts[p].B.Clamp(-F16MAX, F16MAX);
+ }
+ else
+ {
+ aEndPts[p].A.Clamp(0, F16MAX);
+ aEndPts[p].B.Clamp(0, F16MAX);
+ }
+
+ fError += MapColors(pEP, p, np, auPixIdx);
+ }
+
+ return fError;
+}
+
+
+
+//-------------------------------------------------------------------------------------
+// BC7 Compression
+//-------------------------------------------------------------------------------------
+void D3DX_BC7::Decode(HDRColorA* pOut) const
+{
+ assert( pOut );
+
+ size_t uFirst = 0;
+ while(uFirst < 128 && !GetBit(uFirst)) {}
+ uint8_t uMode = uint8_t(uFirst - 1);
+
+ if(uMode < 8)
+ {
+ const uint8_t uPartitions = ms_aInfo[uMode].uPartitions;
+ assert( uPartitions < BC7_MAX_REGIONS );
+ __analysis_assume( uPartitions < BC7_MAX_REGIONS );
+
+ const uint8_t uNumEndPts = (uPartitions + 1) << 1;
+ const uint8_t uIndexPrec = ms_aInfo[uMode].uIndexPrec;
+ const uint8_t uIndexPrec2 = ms_aInfo[uMode].uIndexPrec2;
+ register size_t i;
+ size_t uStartBit = uMode + 1;
+ uint8_t P[6];
+ uint8_t uShape = GetBits(uStartBit, ms_aInfo[uMode].uPartitionBits);
+ assert( uShape < BC7_MAX_SHAPES );
+ __analysis_assume( uShape < BC7_MAX_SHAPES );
+
+ uint8_t uRotation = GetBits(uStartBit, ms_aInfo[uMode].uRotationBits);
+ assert( uRotation < 4 );
+
+ uint8_t uIndexMode = GetBits(uStartBit, ms_aInfo[uMode].uIndexModeBits);
+ assert( uIndexMode < 2 );
+
+ LDRColorA c[BC7_MAX_REGIONS << 1];
+ const LDRColorA RGBAPrec = ms_aInfo[uMode].RGBAPrec;
+ const LDRColorA RGBAPrecWithP = ms_aInfo[uMode].RGBAPrecWithP;
+
+ assert( uNumEndPts <= (BC7_MAX_REGIONS << 1) );
+
+ // Red channel
+ for(i = 0; i < uNumEndPts; i++)
+ {
+ if ( uStartBit + RGBAPrec.r > 128 )
+ {
+#ifdef _DEBUG
+ OutputDebugStringA( "BC7: Invalid block encountered during decoding\n" );
+#endif
+ FillWithErrorColors( pOut );
+ return;
+ }
+
+ c[i].r = GetBits(uStartBit, RGBAPrec.r);
+ }
+
+ // Green channel
+ for(i = 0; i < uNumEndPts; i++)
+ {
+ if ( uStartBit + RGBAPrec.g > 128 )
+ {
+#ifdef _DEBUG
+ OutputDebugStringA( "BC7: Invalid block encountered during decoding\n" );
+#endif
+ FillWithErrorColors( pOut );
+ return;
+ }
+
+ c[i].g = GetBits(uStartBit, RGBAPrec.g);
+ }
+
+ // Blue channel
+ for(i = 0; i < uNumEndPts; i++)
+ {
+ if ( uStartBit + RGBAPrec.b > 128 )
+ {
+#ifdef _DEBUG
+ OutputDebugStringA( "BC7: Invalid block encountered during decoding\n" );
+#endif
+ FillWithErrorColors( pOut );
+ return;
+ }
+
+ c[i].b = GetBits(uStartBit, RGBAPrec.b);
+ }
+
+ // Alpha channel
+ for(i = 0; i < uNumEndPts; i++)
+ {
+ if ( uStartBit + RGBAPrec.a > 128 )
+ {
+#ifdef _DEBUG
+ OutputDebugStringA( "BC7: Invalid block encountered during decoding\n" );
+#endif
+ FillWithErrorColors( pOut );
+ return;
+ }
+
+ c[i].a = RGBAPrec.a ? GetBits(uStartBit, RGBAPrec.a) : 255;
+ }
+
+ // P-bits
+ assert( ms_aInfo[uMode].uPBits <= 6 );
+ __analysis_assume( ms_aInfo[uMode].uPBits <= 6 );
+ for(i = 0; i < ms_aInfo[uMode].uPBits; i++)
+ {
+ if ( uStartBit > 127 )
+ {
+#ifdef _DEBUG
+ OutputDebugStringA( "BC7: Invalid block encountered during decoding\n" );
+#endif
+ FillWithErrorColors( pOut );
+ return;
+ }
+
+ P[i] = GetBit(uStartBit);
+ }
+
+ if(ms_aInfo[uMode].uPBits)
+ {
+ for(i = 0; i < uNumEndPts; i++)
+ {
+ size_t pi = i * ms_aInfo[uMode].uPBits / uNumEndPts;
+ for(register uint8_t ch = 0; ch < BC7_NUM_CHANNELS; ch++)
+ {
+ if(RGBAPrec[ch] != RGBAPrecWithP[ch])
+ {
+ c[i][ch] = (c[i][ch] << 1) | P[pi];
+ }
+ }
+ }
+ }
+
+ for(i = 0; i < uNumEndPts; i++)
+ {
+ c[i] = Unquantize(c[i], RGBAPrecWithP);
+ }
+
+ uint8_t w1[NUM_PIXELS_PER_BLOCK], w2[NUM_PIXELS_PER_BLOCK];
+
+ // read color indices
+ for(i = 0; i < NUM_PIXELS_PER_BLOCK; i++)
+ {
+ size_t uNumBits = IsFixUpOffset(ms_aInfo[uMode].uPartitions, uShape, i) ? uIndexPrec - 1 : uIndexPrec;
+ if ( uStartBit + uNumBits > 128 )
+ {
+#ifdef _DEBUG
+ OutputDebugStringA( "BC7: Invalid block encountered during decoding\n" );
+#endif
+ FillWithErrorColors( pOut );
+ return;
+ }
+ w1[i] = GetBits(uStartBit, uNumBits);
+ }
+
+ // read alpha indices
+ if(uIndexPrec2)
+ {
+ for(i = 0; i < NUM_PIXELS_PER_BLOCK; i++)
+ {
+ size_t uNumBits = i ? uIndexPrec2 : uIndexPrec2 - 1;
+ if ( uStartBit + uNumBits > 128 )
+ {
+#ifdef _DEBUG
+ OutputDebugStringA( "BC7: Invalid block encountered during decoding\n" );
+#endif
+ FillWithErrorColors( pOut );
+ return;
+ }
+ w2[i] = GetBits(uStartBit, uNumBits );
+ }
+ }
+
+ for(i = 0; i < NUM_PIXELS_PER_BLOCK; ++i)
+ {
+ uint8_t uRegion = g_aPartitionTable[uPartitions][uShape][i];
+ LDRColorA outPixel;
+ if(uIndexPrec2 == 0)
+ {
+ LDRColorA::Interpolate(c[uRegion << 1], c[(uRegion << 1) + 1], w1[i], w1[i], uIndexPrec, uIndexPrec, outPixel);
+ }
+ else
+ {
+ if(uIndexMode == 0)
+ {
+ LDRColorA::Interpolate(c[uRegion << 1], c[(uRegion << 1) + 1], w1[i], w2[i], uIndexPrec, uIndexPrec2, outPixel);
+ }
+ else
+ {
+ LDRColorA::Interpolate(c[uRegion << 1], c[(uRegion << 1) + 1], w2[i], w1[i], uIndexPrec2, uIndexPrec, outPixel);
+ }
+ }
+
+ switch(uRotation)
+ {
+ case 1: Swap(outPixel.r, outPixel.a); break;
+ case 2: Swap(outPixel.g, outPixel.a); break;
+ case 3: Swap(outPixel.b, outPixel.a); break;
+ }
+
+ pOut[i] = HDRColorA(outPixel);
+ }
+ }
+ else
+ {
+#ifdef _DEBUG
+ OutputDebugStringA( "BC7: Invalid mode encountered during decoding\n" );
+#endif
+ FillWithErrorColors( pOut );
+ }
+}
+
+void D3DX_BC7::Encode(const HDRColorA* const pIn)
+{
+ assert( pIn );
+
+ D3DX_BC7 final = *this;
+ EncodeParams EP(pIn);
+ float fMSEBest = FLT_MAX;
+
+ for(size_t i = 0; i < NUM_PIXELS_PER_BLOCK; ++i)
+ {
+ EP.aLDRPixels[i].r = uint8_t( std::max<float>( 0.0f, std::min<float>( 255.0f, pIn[i].r * 255.0f + 0.01f ) ) );
+ EP.aLDRPixels[i].g = uint8_t( std::max<float>( 0.0f, std::min<float>( 255.0f, pIn[i].g * 255.0f + 0.01f ) ) );
+ EP.aLDRPixels[i].b = uint8_t( std::max<float>( 0.0f, std::min<float>( 255.0f, pIn[i].b * 255.0f + 0.01f ) ) );
+ EP.aLDRPixels[i].a = uint8_t( std::max<float>( 0.0f, std::min<float>( 255.0f, pIn[i].a * 255.0f + 0.01f ) ) );
+ }
+
+ for(EP.uMode = 0; EP.uMode < 8 && fMSEBest > 0; ++EP.uMode)
+ {
+ const size_t uShapes = 1 << ms_aInfo[EP.uMode].uPartitionBits;
+ assert( uShapes <= BC7_MAX_SHAPES );
+ __analysis_assume( uShapes <= BC7_MAX_SHAPES );
+
+ const size_t uNumRots = 1 << ms_aInfo[EP.uMode].uRotationBits;
+ const size_t uNumIdxMode = 1 << ms_aInfo[EP.uMode].uIndexModeBits;
+ // Number of rough cases to look at. reasonable values of this are 1, uShapes/4, and uShapes
+ // uShapes/4 gets nearly all the cases; you can increase that a bit (say by 3 or 4) if you really want to squeeze the last bit out
+ const size_t uItems = std::max<size_t>(1, uShapes >> 2);
+ float afRoughMSE[BC7_MAX_SHAPES];
+ size_t auShape[BC7_MAX_SHAPES];
+
+ for(size_t r = 0; r < uNumRots && fMSEBest > 0; ++r)
+ {
+ switch(r)
+ {
+ case 1: for(register size_t i = 0; i < NUM_PIXELS_PER_BLOCK; i++) Swap(EP.aLDRPixels[i].r, EP.aLDRPixels[i].a); break;
+ case 2: for(register size_t i = 0; i < NUM_PIXELS_PER_BLOCK; i++) Swap(EP.aLDRPixels[i].g, EP.aLDRPixels[i].a); break;
+ case 3: for(register size_t i = 0; i < NUM_PIXELS_PER_BLOCK; i++) Swap(EP.aLDRPixels[i].b, EP.aLDRPixels[i].a); break;
+ }
+
+ for(size_t im = 0; im < uNumIdxMode && fMSEBest > 0; ++im)
+ {
+ // pick the best uItems shapes and refine these.
+ for(size_t s = 0; s < uShapes; s++)
+ {
+ afRoughMSE[s] = RoughMSE(&EP, s, im);
+ auShape[s] = s;
+ }
+
+ // Bubble up the first uItems items
+ for(size_t i = 0; i < uItems; i++)
+ {
+ for(size_t j = i + 1; j < uShapes; j++)
+ {
+ if(afRoughMSE[i] > afRoughMSE[j])
+ {
+ Swap(afRoughMSE[i], afRoughMSE[j]);
+ Swap(auShape[i], auShape[j]);
+ }
+ }
+ }
+
+ for(size_t i = 0; i < uItems && fMSEBest > 0; i++)
+ {
+ float fMSE = Refine(&EP, auShape[i], r, im);
+ if(fMSE < fMSEBest)
+ {
+ final = *this;
+ fMSEBest = fMSE;
+ }
+ }
+ }
+
+ switch(r)
+ {
+ case 1: for(register size_t i = 0; i < NUM_PIXELS_PER_BLOCK; i++) Swap(EP.aLDRPixels[i].r, EP.aLDRPixels[i].a); break;
+ case 2: for(register size_t i = 0; i < NUM_PIXELS_PER_BLOCK; i++) Swap(EP.aLDRPixels[i].g, EP.aLDRPixels[i].a); break;
+ case 3: for(register size_t i = 0; i < NUM_PIXELS_PER_BLOCK; i++) Swap(EP.aLDRPixels[i].b, EP.aLDRPixels[i].a); break;
+ }
+ }
+ }
+
+ *this = final;
+}
+
+
+//-------------------------------------------------------------------------------------
+void D3DX_BC7::GeneratePaletteQuantized(const EncodeParams* pEP, size_t uIndexMode, const LDREndPntPair& endPts, LDRColorA aPalette[]) const
+{
+ assert( pEP );
+ const size_t uIndexPrec = uIndexMode ? ms_aInfo[pEP->uMode].uIndexPrec2 : ms_aInfo[pEP->uMode].uIndexPrec;
+ const size_t uIndexPrec2 = uIndexMode ? ms_aInfo[pEP->uMode].uIndexPrec : ms_aInfo[pEP->uMode].uIndexPrec2;
+ const size_t uNumIndices = 1 << uIndexPrec;
+ const size_t uNumIndices2 = 1 << uIndexPrec2;
+ assert( uNumIndices > 0 && uNumIndices2 > 0 );
+ __analysis_assume( uNumIndices > 0 && uNumIndices2 > 0 );
+ assert( (uNumIndices <= BC7_MAX_INDICES) && (uNumIndices2 <= BC7_MAX_INDICES) );
+ __analysis_assume( (uNumIndices <= BC7_MAX_INDICES) && (uNumIndices2 <= BC7_MAX_INDICES) );
+
+ LDRColorA a = Unquantize(endPts.A, ms_aInfo[pEP->uMode].RGBAPrecWithP);
+ LDRColorA b = Unquantize(endPts.B, ms_aInfo[pEP->uMode].RGBAPrecWithP);
+ if(uIndexPrec2 == 0)
+ {
+ for(register size_t i = 0; i < uNumIndices; i++)
+ LDRColorA::Interpolate(a, b, i, i, uIndexPrec, uIndexPrec, aPalette[i]);
+ }
+ else
+ {
+ for(register size_t i = 0; i < uNumIndices; i++)
+ LDRColorA::InterpolateRGB(a, b, i, uIndexPrec, aPalette[i]);
+ for(register size_t i = 0; i < uNumIndices2; i++)
+ LDRColorA::InterpolateA(a, b, i, uIndexPrec2, aPalette[i]);
+ }
+}
+
+float D3DX_BC7::PerturbOne(const EncodeParams* pEP, const LDRColorA aColors[], size_t np, size_t uIndexMode, size_t ch,
+ const LDREndPntPair &oldEndPts, LDREndPntPair &newEndPts, float fOldErr, uint8_t do_b) const
+{
+ assert( pEP );
+ const int prec = ms_aInfo[pEP->uMode].RGBAPrecWithP[ch];
+ LDREndPntPair tmp_endPts = newEndPts = oldEndPts;
+ float fMinErr = fOldErr;
+ uint8_t* pnew_c = (do_b ? &newEndPts.B[ch] : &newEndPts.A[ch]);
+ uint8_t* ptmp_c = (do_b ? &tmp_endPts.B[ch] : &tmp_endPts.A[ch]);
+
+ // do a logarithmic search for the best error for this endpoint (which)
+ for(int step = 1 << (prec-1); step; step >>= 1)
+ {
+ bool bImproved = false;
+ int beststep = 0;
+ for(int sign = -1; sign <= 1; sign += 2)
+ {
+ int tmp = int(*pnew_c) + sign * step;
+ if(tmp < 0 || tmp >= (1 << prec))
+ continue;
+ else
+ *ptmp_c = (uint8_t) tmp;
+
+ float fTotalErr = MapColors(pEP, aColors, np, uIndexMode, tmp_endPts, fMinErr);
+ if(fTotalErr < fMinErr)
+ {
+ bImproved = true;
+ fMinErr = fTotalErr;
+ beststep = sign * step;
+ }
+ }
+
+ // if this was an improvement, move the endpoint and continue search from there
+ if(bImproved)
+ *pnew_c = uint8_t(int(*pnew_c) + beststep);
+ }
+ return fMinErr;
+}
+
+// perturb the endpoints at least -3 to 3.
+// always ensure endpoint ordering is preserved (no need to overlap the scan)
+void D3DX_BC7::Exhaustive(const EncodeParams* pEP, const LDRColorA aColors[], size_t np, size_t uIndexMode, size_t ch,
+ float& fOrgErr, LDREndPntPair& optEndPt) const
+{
+ assert( pEP );
+ const uint8_t uPrec = ms_aInfo[pEP->uMode].RGBAPrecWithP[ch];
+ LDREndPntPair tmpEndPt;
+ if(fOrgErr == 0)
+ return;
+
+ int delta = 5;
+
+ // ok figure out the range of A and B
+ tmpEndPt = optEndPt;
+ int alow = std::max<int>(0, int(optEndPt.A[ch]) - delta);
+ int ahigh = std::min<int>((1 << uPrec) - 1, int(optEndPt.A[ch]) + delta);
+ int blow = std::max<int>(0, int(optEndPt.B[ch]) - delta);
+ int bhigh = std::min<int>((1 << uPrec) - 1, int(optEndPt.B[ch]) + delta);
+ int amin = 0;
+ int bmin = 0;
+
+ float fBestErr = fOrgErr;
+ if(optEndPt.A[ch] <= optEndPt.B[ch])
+ {
+ // keep a <= b
+ for(int a = alow; a <= ahigh; ++a)
+ {
+ for(int b = std::max<int>(a, blow); b < bhigh; ++b)
+ {
+ tmpEndPt.A[ch] = (uint8_t) a;
+ tmpEndPt.B[ch] = (uint8_t) b;
+
+ float fErr = MapColors(pEP, aColors, np, uIndexMode, tmpEndPt, fBestErr);
+ if(fErr < fBestErr)
+ {
+ amin = a;
+ bmin = b;
+ fBestErr = fErr;
+ }
+ }
+ }
+ }
+ else
+ {
+ // keep b <= a
+ for(int b = blow; b < bhigh; ++b)
+ {
+ for(int a = std::max<int>(b, alow); a <= ahigh; ++a)
+ {
+ tmpEndPt.A[ch] = (uint8_t) a;
+ tmpEndPt.B[ch] = (uint8_t) b;
+
+ float fErr = MapColors(pEP, aColors, np, uIndexMode, tmpEndPt, fBestErr);
+ if(fErr < fBestErr)
+ {
+ amin = a;
+ bmin = b;
+ fBestErr = fErr;
+ }
+ }
+ }
+ }
+
+ if(fBestErr < fOrgErr)
+ {
+ optEndPt.A[ch] = (uint8_t) amin;
+ optEndPt.B[ch] = (uint8_t) bmin;
+ fOrgErr = fBestErr;
+ }
+}
+
+void D3DX_BC7::OptimizeOne(const EncodeParams* pEP, const LDRColorA aColors[], size_t np, size_t uIndexMode,
+ float fOrgErr, const LDREndPntPair& org, LDREndPntPair& opt) const
+{
+ assert( pEP );
+
+ float fOptErr = fOrgErr;
+ opt = org;
+
+ LDREndPntPair new_a, new_b;
+ LDREndPntPair newEndPts;
+ uint8_t do_b;
+
+ // now optimize each channel separately
+ for(size_t ch = 0; ch < BC7_NUM_CHANNELS; ++ch)
+ {
+ if(ms_aInfo[pEP->uMode].RGBAPrecWithP[ch] == 0)
+ continue;
+
+ // figure out which endpoint when perturbed gives the most improvement and start there
+ // if we just alternate, we can easily end up in a local minima
+ float fErr0 = PerturbOne(pEP, aColors, np, uIndexMode, ch, opt, new_a, fOptErr, 0); // perturb endpt A
+ float fErr1 = PerturbOne(pEP, aColors, np, uIndexMode, ch, opt, new_b, fOptErr, 1); // perturb endpt B
+
+ uint8_t& copt_a = opt.A[ch];
+ uint8_t& copt_b = opt.B[ch];
+ uint8_t& cnew_a = new_a.A[ch];
+ uint8_t& cnew_b = new_a.B[ch];
+
+ if(fErr0 < fErr1)
+ {
+ if(fErr0 >= fOptErr)
+ continue;
+ copt_a = cnew_a;
+ fOptErr = fErr0;
+ do_b = 1; // do B next
+ }
+ else
+ {
+ if(fErr1 >= fOptErr)
+ continue;
+ copt_b = cnew_b;
+ fOptErr = fErr1;
+ do_b = 0; // do A next
+ }
+
+ // now alternate endpoints and keep trying until there is no improvement
+ for( ; ; )
+ {
+ float fErr = PerturbOne(pEP, aColors, np, uIndexMode, ch, opt, newEndPts, fOptErr, do_b);
+ if(fErr >= fOptErr)
+ break;
+ if(do_b == 0)
+ copt_a = cnew_a;
+ else
+ copt_b = cnew_b;
+ fOptErr = fErr;
+ do_b = 1 - do_b; // now move the other endpoint
+ }
+ }
+
+ // finally, do a small exhaustive search around what we think is the global minima to be sure
+ for(size_t ch = 0; ch < BC7_NUM_CHANNELS; ch++)
+ Exhaustive(pEP, aColors, np, uIndexMode, ch, fOptErr, opt);
+}
+
+void D3DX_BC7::OptimizeEndPoints(const EncodeParams* pEP, size_t uShape, size_t uIndexMode, const float afOrgErr[],
+ const LDREndPntPair aOrgEndPts[], LDREndPntPair aOptEndPts[]) const
+{
+ assert( pEP );
+ const uint8_t uPartitions = ms_aInfo[pEP->uMode].uPartitions;
+ assert( uPartitions < BC7_MAX_REGIONS && uShape < BC7_MAX_SHAPES );
+ __analysis_assume( uPartitions < BC7_MAX_REGIONS && uShape < BC7_MAX_SHAPES );
+
+ LDRColorA aPixels[NUM_PIXELS_PER_BLOCK];
+
+ for(size_t p = 0; p <= uPartitions; ++p)
+ {
+ // collect the pixels in the region
+ size_t np = 0;
+ for(register size_t i = 0; i < NUM_PIXELS_PER_BLOCK; ++i)
+ if(g_aPartitionTable[uPartitions][uShape][i] == p)
+ aPixels[np++] = pEP->aLDRPixels[i];
+
+ OptimizeOne(pEP, aPixels, np, uIndexMode, afOrgErr[p], aOrgEndPts[p], aOptEndPts[p]);
+ }
+}
+
+void D3DX_BC7::AssignIndices(const EncodeParams* pEP, size_t uShape, size_t uIndexMode, LDREndPntPair endPts[], size_t aIndices[], size_t aIndices2[],
+ float afTotErr[]) const
+{
+ assert( pEP );
+ assert( uShape < BC7_MAX_SHAPES );
+ __analysis_assume( uShape < BC7_MAX_SHAPES );
+
+ const uint8_t uPartitions = ms_aInfo[pEP->uMode].uPartitions;
+ assert( uPartitions < BC7_MAX_REGIONS );
+ __analysis_assume( uPartitions < BC7_MAX_REGIONS );
+
+ const uint8_t uIndexPrec = uIndexMode ? ms_aInfo[pEP->uMode].uIndexPrec2 : ms_aInfo[pEP->uMode].uIndexPrec;
+ const uint8_t uIndexPrec2 = uIndexMode ? ms_aInfo[pEP->uMode].uIndexPrec : ms_aInfo[pEP->uMode].uIndexPrec2;
+ const uint8_t uNumIndices = 1 << uIndexPrec;
+ const uint8_t uNumIndices2 = 1 << uIndexPrec2;
+
+ assert( (uNumIndices <= BC7_MAX_INDICES) && (uNumIndices2 <= BC7_MAX_INDICES) );
+ __analysis_assume( (uNumIndices <= BC7_MAX_INDICES) && (uNumIndices2 <= BC7_MAX_INDICES) );
+
+ const uint8_t uHighestIndexBit = uNumIndices >> 1;
+ const uint8_t uHighestIndexBit2 = uNumIndices2 >> 1;
+ LDRColorA aPalette[BC7_MAX_REGIONS][BC7_MAX_INDICES];
+
+ // build list of possibles
+ LDREndPntPair adjusted_endPts;
+ for(size_t p = 0; p <= uPartitions; p++)
+ {
+ GeneratePaletteQuantized(pEP, uIndexMode, endPts[p], aPalette[p]);
+ afTotErr[p] = 0;
+ }
+
+ for(register size_t i = 0; i < NUM_PIXELS_PER_BLOCK; i++)
+ {
+ uint8_t uRegion = g_aPartitionTable[uPartitions][uShape][i];
+ assert( uRegion < BC7_MAX_REGIONS );
+ __analysis_assume( uRegion < BC7_MAX_REGIONS );
+ afTotErr[uRegion] += ComputeError(pEP->aLDRPixels[i], aPalette[uRegion], uIndexPrec, uIndexPrec2, &(aIndices[i]), &(aIndices2[i]));
+ }
+
+ // swap endpoints as needed to ensure that the indices at index_positions have a 0 high-order bit
+ if(uIndexPrec2 == 0)
+ {
+ for(register size_t p = 0; p <= uPartitions; p++)
+ {
+ if(aIndices[g_aFixUp[uPartitions][uShape][p]] & uHighestIndexBit)
+ {
+ Swap(endPts[p].A, endPts[p].B);
+ for(register size_t i = 0; i < NUM_PIXELS_PER_BLOCK; i++)
+ if(g_aPartitionTable[uPartitions][uShape][i] == p)
+ aIndices[i] = uNumIndices - 1 - aIndices[i];
+ }
+ assert((aIndices[g_aFixUp[uPartitions][uShape][p]] & uHighestIndexBit) == 0);
+ }
+ }
+ else
+ {
+ for(register size_t p = 0; p <= uPartitions; p++)
+ {
+ if(aIndices[g_aFixUp[uPartitions][uShape][p]] & uHighestIndexBit)
+ {
+ Swap(endPts[p].A.r, endPts[p].B.r);
+ Swap(endPts[p].A.g, endPts[p].B.g);
+ Swap(endPts[p].A.b, endPts[p].B.b);
+ for(register size_t i = 0; i < NUM_PIXELS_PER_BLOCK; i++)
+ if(g_aPartitionTable[uPartitions][uShape][i] == p)
+ aIndices[i] = uNumIndices - 1 - aIndices[i];
+ }
+ assert((aIndices[g_aFixUp[uPartitions][uShape][p]] & uHighestIndexBit) == 0);
+
+ if(aIndices2[0] & uHighestIndexBit2)
+ {
+ Swap(endPts[p].A.a, endPts[p].B.a);
+ for(register size_t i = 0; i < NUM_PIXELS_PER_BLOCK; i++)
+ aIndices2[i] = uNumIndices2 - 1 - aIndices2[i];
+ }
+ assert((aIndices2[0] & uHighestIndexBit2) == 0);
+ }
+ }
+}
+
+void D3DX_BC7::EmitBlock(const EncodeParams* pEP, size_t uShape, size_t uRotation, size_t uIndexMode, const LDREndPntPair aEndPts[], const size_t aIndex[], const size_t aIndex2[])
+{
+ assert( pEP );
+ const uint8_t uPartitions = ms_aInfo[pEP->uMode].uPartitions;
+ assert( uPartitions < BC7_MAX_REGIONS );
+ __analysis_assume( uPartitions < BC7_MAX_REGIONS );
+
+ const size_t uPBits = ms_aInfo[pEP->uMode].uPBits;
+ const size_t uIndexPrec = ms_aInfo[pEP->uMode].uIndexPrec;
+ const size_t uIndexPrec2 = ms_aInfo[pEP->uMode].uIndexPrec2;
+ const LDRColorA RGBAPrec = ms_aInfo[pEP->uMode].RGBAPrec;
+ const LDRColorA RGBAPrecWithP = ms_aInfo[pEP->uMode].RGBAPrecWithP;
+ register size_t i;
+ size_t uStartBit = 0;
+ SetBits(uStartBit, pEP->uMode, 0);
+ SetBits(uStartBit, 1, 1);
+ SetBits(uStartBit, ms_aInfo[pEP->uMode].uRotationBits, static_cast<uint8_t>( uRotation ));
+ SetBits(uStartBit, ms_aInfo[pEP->uMode].uIndexModeBits, static_cast<uint8_t>( uIndexMode ));
+ SetBits(uStartBit, ms_aInfo[pEP->uMode].uPartitionBits, static_cast<uint8_t>( uShape ));
+
+ if(uPBits)
+ {
+ const size_t uNumEP = (1 + uPartitions) << 1;
+ uint8_t aPVote[BC7_MAX_REGIONS << 1] = {0,0,0,0,0,0};
+ uint8_t aCount[BC7_MAX_REGIONS << 1] = {0,0,0,0,0,0};
+ for(uint8_t ch = 0; ch < BC7_NUM_CHANNELS; ch++)
+ {
+ uint8_t ep = 0;
+ for(i = 0; i <= uPartitions; i++)
+ {
+ if(RGBAPrec[ch] == RGBAPrecWithP[ch])
+ {
+ SetBits(uStartBit, RGBAPrec[ch], aEndPts[i].A[ch]);
+ SetBits(uStartBit, RGBAPrec[ch], aEndPts[i].B[ch]);
+ }
+ else
+ {
+ SetBits(uStartBit, RGBAPrec[ch], aEndPts[i].A[ch] >> 1);
+ SetBits(uStartBit, RGBAPrec[ch], aEndPts[i].B[ch] >> 1);
+ size_t idx = ep++ * uPBits / uNumEP;
+ assert(idx < (BC7_MAX_REGIONS << 1));
+ __analysis_assume(idx < (BC7_MAX_REGIONS << 1));
+ aPVote[idx] += aEndPts[i].A[ch] & 0x01;
+ aCount[idx]++;
+ idx = ep++ * uPBits / uNumEP;
+ assert(idx < (BC7_MAX_REGIONS << 1));
+ __analysis_assume(idx < (BC7_MAX_REGIONS << 1));
+ aPVote[idx] += aEndPts[i].B[ch] & 0x01;
+ aCount[idx]++;
+ }
+ }
+ }
+
+ for(i = 0; i < uPBits; i++)
+ {
+ SetBits(uStartBit, 1, aPVote[i] > (aCount[i] >> 1) ? 1 : 0);
+ }
+ }
+ else
+ {
+ for(size_t ch = 0; ch < BC7_NUM_CHANNELS; ch++)
+ {
+ for(i = 0; i <= uPartitions; i++)
+ {
+ SetBits(uStartBit, RGBAPrec[ch], aEndPts[i].A[ch] );
+ SetBits(uStartBit, RGBAPrec[ch], aEndPts[i].B[ch] );
+ }
+ }
+ }
+
+ const size_t* aI1 = uIndexMode ? aIndex2 : aIndex;
+ const size_t* aI2 = uIndexMode ? aIndex : aIndex2;
+ for(i = 0; i < NUM_PIXELS_PER_BLOCK; i++)
+ {
+ if(IsFixUpOffset(ms_aInfo[pEP->uMode].uPartitions, uShape, i))
+ SetBits(uStartBit, uIndexPrec - 1, static_cast<uint8_t>( aI1[i] ));
+ else
+ SetBits(uStartBit, uIndexPrec, static_cast<uint8_t>( aI1[i] ));
+ }
+ if(uIndexPrec2)
+ for(i = 0; i < NUM_PIXELS_PER_BLOCK; i++)
+ SetBits(uStartBit, i ? uIndexPrec2 : uIndexPrec2 - 1, static_cast<uint8_t>( aI2[i] ));
+
+ assert(uStartBit == 128);
+}
+
+float D3DX_BC7::Refine(const EncodeParams* pEP, size_t uShape, size_t uRotation, size_t uIndexMode)
+{
+ assert( pEP );
+ assert( uShape < BC7_MAX_SHAPES );
+ __analysis_assume( uShape < BC7_MAX_SHAPES );
+ const LDREndPntPair* aEndPts = pEP->aEndPts[uShape];
+
+ const size_t uPartitions = ms_aInfo[pEP->uMode].uPartitions;
+ assert( uPartitions < BC7_MAX_REGIONS );
+ __analysis_assume( uPartitions < BC7_MAX_REGIONS );
+
+ LDREndPntPair aOrgEndPts[BC7_MAX_REGIONS];
+ LDREndPntPair aOptEndPts[BC7_MAX_REGIONS];
+ size_t aOrgIdx[NUM_PIXELS_PER_BLOCK];
+ size_t aOrgIdx2[NUM_PIXELS_PER_BLOCK];
+ size_t aOptIdx[NUM_PIXELS_PER_BLOCK];
+ size_t aOptIdx2[NUM_PIXELS_PER_BLOCK];
+ float aOrgErr[BC7_MAX_REGIONS];
+ float aOptErr[BC7_MAX_REGIONS];
+
+ for(register size_t p = 0; p <= uPartitions; p++)
+ {
+ aOrgEndPts[p].A = Quantize(aEndPts[p].A, ms_aInfo[pEP->uMode].RGBAPrecWithP);
+ aOrgEndPts[p].B = Quantize(aEndPts[p].B, ms_aInfo[pEP->uMode].RGBAPrecWithP);
+ }
+
+ AssignIndices(pEP, uShape, uIndexMode, aOrgEndPts, aOrgIdx, aOrgIdx2, aOrgErr);
+ OptimizeEndPoints(pEP, uShape, uIndexMode, aOrgErr, aOrgEndPts, aOptEndPts);
+ AssignIndices(pEP, uShape, uIndexMode, aOptEndPts, aOptIdx, aOptIdx2, aOptErr);
+
+ float fOrgTotErr = 0, fOptTotErr = 0;
+ for(register size_t p = 0; p <= uPartitions; p++)
+ {
+ fOrgTotErr += aOrgErr[p];
+ fOptTotErr += aOptErr[p];
+ }
+ if(fOptTotErr < fOrgTotErr)
+ {
+ EmitBlock(pEP, uShape, uRotation, uIndexMode, aOptEndPts, aOptIdx, aOptIdx2);
+ return fOptTotErr;
+ }
+ else
+ {
+ EmitBlock(pEP, uShape, uRotation, uIndexMode, aOrgEndPts, aOrgIdx, aOrgIdx2);
+ return fOrgTotErr;
+ }
+}
+
+float D3DX_BC7::MapColors(const EncodeParams* pEP, const LDRColorA aColors[], size_t np, size_t uIndexMode, const LDREndPntPair& endPts, float fMinErr) const
+{
+ assert( pEP );
+ const uint8_t uIndexPrec = uIndexMode ? ms_aInfo[pEP->uMode].uIndexPrec2 : ms_aInfo[pEP->uMode].uIndexPrec;
+ const uint8_t uIndexPrec2 = uIndexMode ? ms_aInfo[pEP->uMode].uIndexPrec : ms_aInfo[pEP->uMode].uIndexPrec2;
+ LDRColorA aPalette[BC7_MAX_INDICES];
+ float fTotalErr = 0;
+
+ GeneratePaletteQuantized(pEP, uIndexMode, endPts, aPalette);
+ for(register size_t i = 0; i < np; ++i)
+ {
+ fTotalErr += ComputeError(aColors[i], aPalette, uIndexPrec, uIndexPrec2);
+ if(fTotalErr > fMinErr) // check for early exit
+ {
+ fTotalErr = FLT_MAX;
+ break;
+ }
+ }
+
+ return fTotalErr;
+}
+
+float D3DX_BC7::RoughMSE(EncodeParams* pEP, size_t uShape, size_t uIndexMode)
+{
+ assert( pEP );
+ assert( uShape < BC7_MAX_SHAPES );
+ __analysis_assume( uShape < BC7_MAX_SHAPES );
+ LDREndPntPair* aEndPts = pEP->aEndPts[uShape];
+
+ const uint8_t uPartitions = ms_aInfo[pEP->uMode].uPartitions;
+ assert( uPartitions < BC7_MAX_REGIONS );
+ __analysis_assume( uPartitions < BC7_MAX_REGIONS );
+
+ const uint8_t uIndexPrec = uIndexMode ? ms_aInfo[pEP->uMode].uIndexPrec2 : ms_aInfo[pEP->uMode].uIndexPrec;
+ const uint8_t uIndexPrec2 = uIndexMode ? ms_aInfo[pEP->uMode].uIndexPrec : ms_aInfo[pEP->uMode].uIndexPrec2;
+ const uint8_t uNumIndices = 1 << uIndexPrec;
+ const uint8_t uNumIndices2 = 1 << uIndexPrec2;
+ size_t auPixIdx[NUM_PIXELS_PER_BLOCK];
+ LDRColorA aPalette[BC7_MAX_REGIONS][BC7_MAX_INDICES];
+
+ for(size_t p = 0; p <= uPartitions; p++)
+ {
+ size_t np = 0;
+ for(register size_t i = 0; i < NUM_PIXELS_PER_BLOCK; i++)
+ {
+ if (g_aPartitionTable[uPartitions][uShape][i] == p)
+ {
+ auPixIdx[np++] = i;
+ }
+ }
+
+ // handle simple cases
+ assert(np > 0);
+ if(np == 1)
+ {
+ aEndPts[p].A = pEP->aLDRPixels[auPixIdx[0]];
+ aEndPts[p].B = pEP->aLDRPixels[auPixIdx[0]];
+ continue;
+ }
+ else if(np == 2)
+ {
+ aEndPts[p].A = pEP->aLDRPixels[auPixIdx[0]];
+ aEndPts[p].B = pEP->aLDRPixels[auPixIdx[1]];
+ continue;
+ }
+
+ if(uIndexPrec2 == 0)
+ {
+ HDRColorA epA, epB;
+ OptimizeRGBA(pEP->aHDRPixels, &epA, &epB, 4, np, auPixIdx);
+ epA.Clamp(0.0f, 1.0f);
+ epB.Clamp(0.0f, 1.0f);
+ epA *= 255.0f;
+ epB *= 255.0f;
+ aEndPts[p].A = epA.ToLDRColorA();
+ aEndPts[p].B = epB.ToLDRColorA();
+ }
+ else
+ {
+ uint8_t uMinAlpha = 255, uMaxAlpha = 0;
+ for(register size_t i = 0; i < NUM_PIXELS_PER_BLOCK; ++i)
+ {
+ uMinAlpha = std::min<uint8_t>(uMinAlpha, pEP->aLDRPixels[auPixIdx[i]].a);
+ uMaxAlpha = std::max<uint8_t>(uMaxAlpha, pEP->aLDRPixels[auPixIdx[i]].a);
+ }
+
+ HDRColorA epA, epB;
+ OptimizeRGB(pEP->aHDRPixels, &epA, &epB, 4, np, auPixIdx);
+ epA.Clamp(0.0f, 1.0f);
+ epB.Clamp(0.0f, 1.0f);
+ epA *= 255.0f;
+ epB *= 255.0f;
+ aEndPts[p].A = epA.ToLDRColorA();
+ aEndPts[p].B = epB.ToLDRColorA();
+ aEndPts[p].A.a = uMinAlpha;
+ aEndPts[p].B.a = uMaxAlpha;
+ }
+ }
+
+ if(uIndexPrec2 == 0)
+ {
+ for(size_t p = 0; p <= uPartitions; p++)
+ for(register size_t i = 0; i < uNumIndices; i++)
+ LDRColorA::Interpolate(aEndPts[p].A, aEndPts[p].B, i, i, uIndexPrec, uIndexPrec, aPalette[p][i]);
+ }
+ else
+ {
+ for(size_t p = 0; p <= uPartitions; p++)
+ {
+ for(register size_t i = 0; i < uNumIndices; i++)
+ LDRColorA::InterpolateRGB(aEndPts[p].A, aEndPts[p].B, i, uIndexPrec, aPalette[p][i]);
+ for(register size_t i = 0; i < uNumIndices2; i++)
+ LDRColorA::InterpolateA(aEndPts[p].A, aEndPts[p].B, i, uIndexPrec2, aPalette[p][i]);
+ }
+ }
+
+ float fTotalErr = 0;
+ for(register size_t i = 0; i < NUM_PIXELS_PER_BLOCK; i++)
+ {
+ uint8_t uRegion = g_aPartitionTable[uPartitions][uShape][i];
+ fTotalErr += ComputeError(pEP->aLDRPixels[i], aPalette[uRegion], uIndexPrec, uIndexPrec2);
+ }
+
+ return fTotalErr;
+}
+
+//=====================================================================================
+// Entry points
+//=====================================================================================
+
+//-------------------------------------------------------------------------------------
+// BC6H Compression
+//-------------------------------------------------------------------------------------
+void D3DXDecodeBC6HU(XMVECTOR *pColor, const uint8_t *pBC)
+{
+ assert( pColor && pBC );
+ static_assert( sizeof(D3DX_BC6H) == 16, "D3DX_BC6H should be 16 bytes" );
+ reinterpret_cast< const D3DX_BC6H* >( pBC )->Decode(false, reinterpret_cast<HDRColorA*>(pColor));
+}
+
+void D3DXDecodeBC6HS(XMVECTOR *pColor, const uint8_t *pBC)
+{
+ assert( pColor && pBC );
+ static_assert( sizeof(D3DX_BC6H) == 16, "D3DX_BC6H should be 16 bytes" );
+ reinterpret_cast< const D3DX_BC6H* >( pBC )->Decode(true, reinterpret_cast<HDRColorA*>(pColor));
+}
+
+void D3DXEncodeBC6HU(uint8_t *pBC, const XMVECTOR *pColor, DWORD flags)
+{
+ UNREFERENCED_PARAMETER(flags);
+ assert( pBC && pColor );
+ static_assert( sizeof(D3DX_BC6H) == 16, "D3DX_BC6H should be 16 bytes" );
+ reinterpret_cast< D3DX_BC6H* >( pBC )->Encode(false, reinterpret_cast<const HDRColorA*>(pColor));
+}
+
+void D3DXEncodeBC6HS(uint8_t *pBC, const XMVECTOR *pColor, DWORD flags)
+{
+ UNREFERENCED_PARAMETER(flags);
+ assert( pBC && pColor );
+ static_assert( sizeof(D3DX_BC6H) == 16, "D3DX_BC6H should be 16 bytes" );
+ reinterpret_cast< D3DX_BC6H* >( pBC )->Encode(true, reinterpret_cast<const HDRColorA*>(pColor));
+}
+
+
+//-------------------------------------------------------------------------------------
+// BC7 Compression
+//-------------------------------------------------------------------------------------
+void D3DXDecodeBC7(XMVECTOR *pColor, const uint8_t *pBC)
+{
+ assert( pColor && pBC );
+ static_assert( sizeof(D3DX_BC7) == 16, "D3DX_BC7 should be 16 bytes" );
+ reinterpret_cast< const D3DX_BC7* >( pBC )->Decode(reinterpret_cast<HDRColorA*>(pColor));
+}
+
+void D3DXEncodeBC7(uint8_t *pBC, const XMVECTOR *pColor, DWORD flags)
+{
+ UNREFERENCED_PARAMETER(flags);
+ assert( pBC && pColor );
+ static_assert( sizeof(D3DX_BC7) == 16, "D3DX_BC7 should be 16 bytes" );
+ reinterpret_cast< D3DX_BC7* >( pBC )->Encode(reinterpret_cast<const HDRColorA*>(pColor));
+}
+
+} // namespace
\ No newline at end of file
projects / apitrace / blobdiff