Define new tokens from the ARB_robustness extension if needed

The ARB_robustness extension defined the following tokens as
returned by GetGraphicsResetStatusARB (see spec at [1]):

  GUILTY_CONTEXT_RESET_ARB    0x8253
  INNOCENT_CONTEXT_RESET_ARB  0x8254
  UNKNOWN_CONTEXT_RESET_ARB   0x8255

These tokens might not be defined in some GL implementations,
such as Mesa 13's implementation of GLES 2.0, so we need to
define them ourselves not to break those builds.

[1] https://www.khronos.org/registry/OpenGL/extensions/ARB/ARB_robustness.txt

https://bugzilla.gnome.org/show_bug.cgi?id=781398

1 files changed, 13 insertions, 0 deletions

diff --git a/cogl/cogl/cogl-context.c b/cogl/cogl/cogl-context.c
index c45c9b44b..70d220659 100644
--- a/cogl/cogl/cogl-context.c
+++ b/cogl/cogl/cogl-context.c
@@ -81,6 +81,19 @@
 #define GL_PURGED_CONTEXT_RESET_NV 0x92BB
 #endif
 
+/* These aren't defined in the GLES2 headers */
+#ifndef GL_GUILTY_CONTEXT_RESET_ARB
+#define GL_GUILTY_CONTEXT_RESET_ARB 0x8253
+#endif
+
+#ifndef GL_INNOCENT_CONTEXT_RESET_ARB
+#define GL_INNOCENT_CONTEXT_RESET_ARB 0x8254
+#endif
+
+#ifndef GL_UNKNOWN_CONTEXT_RESET_ARB
+#define GL_UNKNOWN_CONTEXT_RESET_ARB 0x8255
+#endif
+
 static void _cogl_context_free (CoglContext *context);
 
 COGL_OBJECT_DEFINE (Context, context);