Bug 744888 - Work around a NVIDIA driver bug - r=jgilbert

gfx/gl/GLContext.h

@@ -72,6 +72,8 @@ typedef char realGLboolean;
 
 #include "GLContextSymbols.h"
 
+#include "mozilla/mozalloc.h"
+
 namespace mozilla {
   namespace layers {
     class LayerManagerOGL;
@@ -2028,6 +2030,16 @@ public:
     void fBufferData(GLenum target, GLsizeiptr size, const GLvoid* data, GLenum usage) {
         BEFORE_GL_CALL;
         mSymbols.fBufferData(target, size, data, usage);
+
+        // bug 744888
+        if (WorkAroundDriverBugs() &&
+            !data &&
+            Vendor() == VendorNVIDIA)
+        {
+            char c = 0;
+            mSymbols.fBufferSubData(target, size-1, 1, &c);
+        }
+
         AFTER_GL_CALL;
     }