[Bf-blender-cvs] [46478ad] master: enable OpenSubdiv Transform Feedback on Intel

[Mike Erwin]

Commit: 46478ad2bc2f3b6d66fdfec286a32da6f43e34cf
Author: Mike Erwin
Date:   Sat Nov 14 13:34:41 2015 -0500
Branches: master
https://developer.blender.org/rB46478ad2bc2f3b6d66fdfec286a32da6f43e34cf

enable OpenSubdiv Transform Feedback on Intel

Fixed extension check.

This feature requires ARB_texture_buffer_object which was subsumed into
OpenGL 3.0. Intel driver on Windows doesn't claim to support this
extension, but GL version is > 3 so it actually does work.

===================================================================

M	intern/opensubdiv/opensubdiv_utils_capi.cc

===================================================================

diff --git a/intern/opensubdiv/opensubdiv_utils_capi.cc b/intern/opensubdiv/opensubdiv_utils_capi.cc
index ea7b3bc..6556b8c 100644
--- a/intern/opensubdiv/opensubdiv_utils_capi.cc
+++ b/intern/opensubdiv/opensubdiv_utils_capi.cc
@@ -66,7 +66,8 @@ int openSubdiv_getAvailableEvaluators(void)
 #endif  /* OPENSUBDIV_HAS_OPENCL */
 
 #ifdef OPENSUBDIV_HAS_GLSL_TRANSFORM_FEEDBACK
-	if (GLEW_ARB_texture_buffer_object) {
+	if (GLEW_VERSION_3_0 || GLEW_ARB_texture_buffer_object) {
+		// TODO(merwin): remove extension check once Blender moves to 3.2 core
 		flags |= OPENSUBDIV_EVALUATOR_GLSL_TRANSFORM_FEEDBACK;
 	}
 #endif  /* OPENSUBDIV_HAS_GLSL_TRANSFORM_FEEDBACK */