gltrace: Handle negative lengths in glShaderSource* (issue #116).

[apitrace] / helpers / glsize.hpp

diff --git a/helpers/glsize.hpp b/helpers/glsize.hpp
index 24c0ac999aa62faa225c26a16110d456de8055bc..2da217f123a24ba3ce3058548f7886c9eb23640c 100644 (file)
--- a/helpers/glsize.hpp
+++ b/helpers/glsize.hpp
@@ -329,6 +329,21 @@ _glArrayPointer_size(GLint size, GLenum type, GLsizei stride, GLsizei count)
 #define _glVertexAttribPointerARB_size(size, type, normalized, stride, count) _glArrayPointer_size(size, type, stride, count)
 #define _glVertexAttribPointerNV_size(size, type, stride, count) _glArrayPointer_size(size, type, stride, count)
 
+/**
+ * Same as glGetIntegerv, but passing the result in the return value.
+ */
+static inline GLint
+_glGetInteger(GLenum pname) {
+    GLint param = 0;
+    _glGetIntegerv(pname, &param);
+    return param;
+}
+
+static inline GLint
+_element_array_buffer_binding(void) {
+    return _glGetInteger(GL_ELEMENT_ARRAY_BUFFER_BINDING);
+}
+
 static inline GLuint
 _glDrawArrays_count(GLint first, GLsizei count)
 {
@@ -340,17 +355,21 @@ _glDrawArrays_count(GLint first, GLsizei count)
 
 #define _glDrawArraysEXT_count _glDrawArrays_count
 
+/* Forward declaration for definition in gltrace.py */
+void
+_shadow_glGetBufferSubData(GLenum target, GLintptr offset, GLsizeiptr size,
+                              GLvoid *data);
+
 static inline GLuint
 _glDrawElementsBaseVertex_count(GLsizei count, GLenum type, const GLvoid *indices, GLint basevertex)
 {
     GLvoid *temp = 0;
-    GLint element_array_buffer = 0;
 
     if (!count) {
         return 0;
     }
 
-    _glGetIntegerv(GL_ELEMENT_ARRAY_BUFFER_BINDING, &element_array_buffer);
+    GLint element_array_buffer = _element_array_buffer_binding();
     if (element_array_buffer) {
         // Read indices from index buffer object
         GLintptr offset = (GLintptr)indices;
@@ -360,7 +379,7 @@ _glDrawElementsBaseVertex_count(GLsizei count, GLenum type, const GLvoid *indice
             return 0;
         }
         memset(temp, 0, size);
-        _glGetBufferSubData(GL_ELEMENT_ARRAY_BUFFER, offset, size, temp);
+        _shadow_glGetBufferSubData(GL_ELEMENT_ARRAY_BUFFER, offset, size, temp);
         indices = temp;
     } else {
         if (!indices) {
@@ -612,12 +631,12 @@ _align(X x, Y y) {
     return (x + (y - 1)) & ~(y - 1);
 }
 
-static inline size_t
-_gl_image_size(GLenum format, GLenum type, GLsizei width, GLsizei height, GLsizei depth, GLboolean has_unpack_subimage) {
+static inline void
+_gl_format_size(GLenum format, GLenum type,
+                unsigned & bits_per_element, unsigned & bits_per_pixel)
+{
     unsigned num_channels = _gl_format_channels(format);
 
-    unsigned bits_per_element;
-    unsigned bits_per_pixel;
     switch (type) {
     case GL_BITMAP:
         bits_per_pixel = bits_per_element = 1;
@@ -672,6 +691,22 @@ _gl_image_size(GLenum format, GLenum type, GLsizei width, GLsizei height, GLsize
         bits_per_pixel = bits_per_element = 0;
         break;
     }
+}
+
+static inline size_t
+_glClearBufferData_size(GLenum format, GLenum type) {
+    unsigned bits_per_element;
+    unsigned bits_per_pixel;
+    _gl_format_size(format, type, bits_per_element, bits_per_pixel);
+    return (bits_per_pixel + 7)/8;
+}
+
+static inline size_t
+_gl_image_size(GLenum format, GLenum type, GLsizei width, GLsizei height, GLsizei depth, GLboolean has_unpack_subimage) {
+
+    unsigned bits_per_element;
+    unsigned bits_per_pixel;
+    _gl_format_size(format, type, bits_per_element, bits_per_pixel);
 
     GLint alignment = 4;
     GLint row_length = 0;
@@ -780,6 +815,22 @@ _glClearBuffer_size(GLenum buffer)
     }
 }
 
+
+/**
+ * Helper function for determining the string lengths for glShaderSource and
+ * glShaderSourceARB, which is a tad too complex to inline in the specs.
+ */
+template<class T>
+static inline size_t
+_glShaderSource_length(const T * const * string, const GLint *length, GLsizei index)
+{
+    if (length != NULL && length[index] >= 0) {
+        return (size_t)length[index];
+    } else {
+        return strlen(string[index]);
+    }
+}
+
 /* 
  * attribute list, terminated by the given terminator.
  */