From cfce638e85aa64f765bfefb7f6a1ccd4a866b6dc Mon Sep 17 00:00:00 2001
From: =?utf8?q?Jos=C3=A9=20Fonseca?= <jose.r.fonseca@gmail.com>
Date: Tue, 23 Oct 2012 20:16:04 +0100
Subject: [PATCH] Fix creation of shared WGL contexts.

---
 retrace/glws_wgl.cpp | 45 ++++++++++++++++++++++++++++----------------
 1 file changed, 29 insertions(+), 16 deletions(-)

diff --git a/retrace/glws_wgl.cpp b/retrace/glws_wgl.cpp
index b4fd922..878726b 100644
--- a/retrace/glws_wgl.cpp
+++ b/retrace/glws_wgl.cpp
@@ -243,6 +243,34 @@ public:
             wglDeleteContext(hglrc);
         }
     }
+
+    bool
+    create(WglDrawable *wglDrawable) {
+        if (!hglrc) {
+            hglrc = wglCreateContext(wglDrawable->hDC);
+            if (!hglrc) {
+                std::cerr << "error: wglCreateContext failed\n";
+                exit(1);
+                return false;
+            }
+            if (shareContext) {
+                if (shareContext->create(wglDrawable)) {
+                    BOOL bRet;
+                    bRet = wglShareLists(shareContext->hglrc,
+                                         hglrc);
+                    if (!bRet) {
+                        std::cerr
+                            << "warning: wglShareLists failed: "
+                            << std::hex << GetLastError() << std::dec
+                            << "\n";
+                    }
+                }
+            }
+        }
+
+        return true;
+    }
+
 };
 
 
@@ -311,22 +339,7 @@ makeCurrent(Drawable *drawable, Context *context)
         WglDrawable *wglDrawable = static_cast<WglDrawable *>(drawable);
         WglContext *wglContext = static_cast<WglContext *>(context);
 
-        if (!wglContext->hglrc) {
-            wglContext->hglrc = wglCreateContext(wglDrawable->hDC);
-            if (!wglContext->hglrc) {
-                std::cerr << "error: wglCreateContext failed\n";
-                exit(1);
-                return false;
-            }
-            if (wglContext->shareContext) {
-                BOOL bRet;
-                bRet = wglShareLists(wglContext->shareContext->hglrc,
-                                     wglContext->hglrc);
-                if (!bRet) {
-                    std::cerr << "warning: wglShareLists failed\n";
-                }
-            }
-        }
+        wglContext->create(wglDrawable);
 
         return wglMakeCurrent(wglDrawable->hDC, wglContext->hglrc);
     }
-- 
2.43.0