From 8d084e8c8f48dd2f07d4a3fbd4a941a7bcc0dcfb Mon Sep 17 00:00:00 2001
From: Jason Wilkins <Jason.A.Wilkins@gmail.com>
Date: Tue, 7 Oct 2014 15:46:19 -0500
Subject: Ghost Context Refactor https://developer.blender.org/D643 Separates
 graphics context creation from window code in Ghost so that they can vary
 separately.

---
 intern/glew-mx/glew-mx.h | 112 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 112 insertions(+)
 create mode 100644 intern/glew-mx/glew-mx.h

(limited to 'intern/glew-mx/glew-mx.h')

diff --git a/intern/glew-mx/glew-mx.h b/intern/glew-mx/glew-mx.h
new file mode 100644
index 00000000000..cf90870261c
--- /dev/null
+++ b/intern/glew-mx/glew-mx.h
@@ -0,0 +1,112 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2014 Blender Foundation.
+ * All rights reserved.
+ *
+ * The Original Code is: all of this file.
+ *
+ * Contributor(s): Jason Wilkins
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+/** \file glew-mx.h
+ *  \ingroup 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__
+
+#ifdef WITH_GLEW_MX
+/* glew itself expects this */
+#  define GLEW_MX 1
+#  define glewGetContext() (&(_mx_context->glew_context))
+#endif
+
+#include <GL/glew.h>
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* MXContext is used instead of GLEWContext directly so that
+   extending what data is held by a context is easier.
+ */
+typedef struct MXContext {
+#ifdef WITH_GLEW_MX
+	GLEWContext glew_context;
+#endif
+
+	int reserved; /* structs need at least one member */
+
+} MXContext;
+
+#ifdef WITH_GLEW_MX
+extern MXContext *_mx_context;
+#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_GL_PROFILE_CORE) && !defined(WITH_GL_PROFILE_COMPAT) && !defined(WITH_GL_PROFILE_ES20)
+#  include "intern/gl-deprecated.h"
+#endif
+
+
+MXContext *mxCreateContext     (void);
+MXContext *mxGetCurrentContext (void);
+void       mxMakeCurrentContext(MXContext *ctx);
+void       mxDestroyContext    (MXContext *ctx);
+
+
+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__ */
-- 
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