Cycles: Remove OpenGL header

It is not really used from any of the sources, including the
standalone app. Since we are moving to a more backend-independent
drawing it makes sense to remove header which was specific to
how Blender integrates Cycles into viewport.

There is probably some cleanup in CMake files is possible, but
there is some inter-dependency with USD.

Differential Revision: https://developer.blender.org/D16681

intern/cycles/blender/display_driver.cpp

@@ -6,7 +6,6 @@
 #include "device/device.h"
 #include "util/log.h"
 #include "util/math.h"
-#include "util/opengl.h"
 
 #include "GPU_context.h"
 #include "GPU_immediate.h"

intern/cycles/blender/python.cpp

@@ -18,7 +18,6 @@
 #include "util/guiding.h"
 #include "util/log.h"
 #include "util/md5.h"
-#include "util/opengl.h"
 #include "util/openimagedenoise.h"
 #include "util/path.h"
 #include "util/string.h"

intern/cycles/blender/sync.cpp

@@ -26,7 +26,6 @@
 #include "util/foreach.h"
 #include "util/hash.h"
 #include "util/log.h"
-#include "util/opengl.h"
 #include "util/openimagedenoise.h"
 
 CCL_NAMESPACE_BEGIN

intern/cycles/util/CMakeLists.txt

@@ -74,7 +74,6 @@ set(SRC_HEADERS
   md5.h
   murmurhash.h
   openimagedenoise.h
-  opengl.h
   openvdb.h
   optimization.h
   param.h

intern/cycles/util/opengl.h

@@ -1,12 +0,0 @@
-/* SPDX-License-Identifier: Apache-2.0
- * Copyright 2011-2022 Blender Foundation */
-
-#ifndef __UTIL_OPENGL_H__
-#define __UTIL_OPENGL_H__
-
-/* OpenGL header includes, used everywhere we use OpenGL, to deal with
- * platform differences in one central place. */
-
-#include <epoxy/gl.h>
-
-#endif /* __UTIL_OPENGL_H__ */