GPU: replace GLEW with libepoxy

With libepoxy we can choose between EGL and GLX at runtime, as well as
dynamically open EGL and GLX libraries without linking to them.

This will make it possible to build with Wayland, EGL, GLVND support while
still running on systems that only have X11, GLX and libGL. It also paves
the way for headless rendering through EGL.

libepoxy is a new library dependency, and is included in the precompiled
libraries. GLEW is no longer a dependency, and WITH_SYSTEM_GLEW was removed.

Includes contributions by Brecht Van Lommel, Ray Molenkamp, Campbell Barton
and Sergey Sharybin.

Ref T76428

Differential Revision: https://developer.blender.org/D15291

1 files changed, 0 insertions, 57 deletions

diff --git a/intern/glew-mx/glew-mx.h b/intern/glew-mx/glew-mx.h
deleted file mode 100644
index e7972697010..00000000000
--- a/intern/glew-mx/glew-mx.h
+++ /dev/null
@@ -1,57 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-or-later
- * Copyright 2014 Blender Foundation. All rights reserved. */
-
-/** \file
- * \ingroup intern_glew-mx
- *
- * Support for GLEW Multiple rendering conteXts (MX)
- * Maintained as a Blender Library.
- *
- * Different rendering contexts may have different entry points
- * to extension functions of the same name.  So it can cause
- * problems if, for example, a second context uses a pointer to
- * say, glActiveTextureARB, that was queried from the first context.
- *
- * GLEW has basic support for multiple contexts by enabling WITH_GLEW_MX,
- * but it does not provide a full implementation.  This is because
- * there are too many questions about thread safety and memory
- * allocation that are up to the user of GLEW.
- *
- * This implementation is very basic and isn't thread safe.
- * For a single context the overhead should be
- * no more than using GLEW without WITH_GLEW_MX enabled.
- */
-
-#ifndef __GLEW_MX_H__
-#define __GLEW_MX_H__
-
-#include <GL/glew.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#include "intern/symbol-binding.h"
-
-/* If compiling only for OpenGL 3.2 Core Profile then we should make sure
- * no legacy API entries or symbolic constants are used.
- */
-#if (!defined(WITH_LEGACY_OPENGL)) || defined(WITH_GL_PROFILE_CORE) && \
-                                          !defined(WITH_GL_PROFILE_COMPAT) && \
-                                          !defined(WITH_GL_PROFILE_ES20)
-#  include "intern/gl-deprecated.h"
-#endif
-
-GLenum glew_chk(GLenum error, const char *file, int line, const char *text);
-
-#ifndef NDEBUG
-#  define GLEW_CHK(x) glew_chk((x), __FILE__, __LINE__, #  x)
-#else
-#  define GLEW_CHK(x) glew_chk((x), NULL, 0, NULL)
-#endif
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* __GLEW_MX_H__ */