Moved OpenGL includes out from Magnum.h.

OpenGL includes are ~35k lines together and it is a waste of
compilation time to include them even if they are not needed at all
(e.g. whole SceneGraph and Physics libraries). Saves ~10s of compilation
time (6:46 before, now 6:35).

src/AbstractImage.h

@@ -22,7 +22,7 @@
 #include <cstddef>
 
 #include "Magnum.h"
-
+#include "OpenGL.h"
 #include "magnumVisibility.h"
 
 namespace Magnum {

src/AbstractShaderProgram.cpp

@@ -28,20 +28,6 @@
 
 namespace Magnum {
 
-#ifndef DOXYGEN_GENERATING_OUTPUT
-static_assert(std::is_same<GLubyte, UnsignedByte>::value, "GLubyte is not the same as UnsignedByte");
-static_assert(std::is_same<GLbyte, Byte>::value, "GLbyte is not the same as Byte");
-static_assert(std::is_same<GLushort, UnsignedShort>::value, "GLushort is not the same as UnsignedShort");
-static_assert(std::is_same<GLshort, Short>::value, "GLshort is not the same as Short");
-static_assert(std::is_same<GLuint, UnsignedInt>::value, "GLuint is not the same as UnsignedInt");
-static_assert(std::is_same<GLint, Int>::value, "GLint is not the same as Int");
-static_assert(std::is_same<GLsizei, Int>::value, "GLsizei is not the same as Int");
-static_assert(std::is_same<GLfloat, Float>::value, "GLfloat is not the same as Float");
-#ifndef MAGNUM_TARGET_GLES
-static_assert(std::is_same<GLdouble, Double>::value, "GLdouble is not the same as Double");
-#endif
-#endif
-
 AbstractShaderProgram::Uniform1fImplementation AbstractShaderProgram::uniform1fImplementation = &AbstractShaderProgram::uniformImplementationDefault;
 AbstractShaderProgram::Uniform2fvImplementation AbstractShaderProgram::uniform2fvImplementation = &AbstractShaderProgram::uniformImplementationDefault;
 AbstractShaderProgram::Uniform3fvImplementation AbstractShaderProgram::uniform3fvImplementation = &AbstractShaderProgram::uniformImplementationDefault;

src/AbstractShaderProgram.h

@@ -23,7 +23,7 @@
 #include <Containers/EnumSet.h>
 
 #include "Magnum.h"
-
+#include "OpenGL.h"
 #include "magnumVisibility.h"
 
 /** @todo early asserts (no bool returns?) */

src/Buffer.h

@@ -25,7 +25,7 @@
 #include <Containers/EnumSet.h>
 
 #include "Magnum.h"
-
+#include "OpenGL.h"
 #include "magnumVisibility.h"
 
 namespace Magnum {

src/CMakeLists.txt

@@ -22,6 +22,7 @@ set(Magnum_SRCS
     Framebuffer.cpp
     Image.cpp
     Mesh.cpp
+    OpenGL.cpp
     Query.cpp
     Renderbuffer.cpp
     Resource.cpp
@@ -69,6 +70,7 @@ set(Magnum_HEADERS
     ImageWrapper.h
     Magnum.h
     Mesh.h
+    OpenGL.h
     Query.h
     Renderbuffer.h
     Renderer.h

src/Context.h

@@ -23,7 +23,7 @@
 #include <vector>
 
 #include "Magnum.h"
-
+#include "OpenGL.h"
 #include "magnumVisibility.h"
 
 namespace Magnum {

src/Magnum.h

@@ -16,28 +16,15 @@
 */
 
 /** @file
- * @brief Basic definitions and forward declarations for Magnum namespace
+ * @brief Forward declarations for Magnum namespace
  */
 
 #include <corradeConfigure.h>
 
 #include "Math/Math.h"
 #include "Types.h"
-
 #include "magnumConfigure.h"
 
-#ifndef MAGNUM_TARGET_GLES
-#include <GL/glew.h>
-#include <GL/glcorearb.h>
-#else
-#ifndef MAGNUM_TARGET_GLES2
-#include <GLES3/gl3.h>
-#else
-#include <GLES2/gl2.h>
-#include <GLES2/gl2ext.h>
-#endif
-#endif
-
 namespace Corrade {
     namespace Utility {
         class Debug;

src/OpenGL.cpp

@@ -0,0 +1,35 @@
+/*
+    Copyright © 2010, 2011, 2012 Vladimír Vondruš <mosra@centrum.cz>
+
+    This file is part of Magnum.
+
+    Magnum is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License version 3
+    only, as published by the Free Software Foundation.
+
+    Magnum 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 Lesser General Public License version 3 for more details.
+*/
+
+#include <type_traits>
+
+#include "OpenGL.h"
+#include "Types.h"
+
+namespace Magnum {
+
+static_assert(std::is_same<GLubyte, UnsignedByte>::value, "GLubyte is not the same as UnsignedByte");
+static_assert(std::is_same<GLbyte, Byte>::value, "GLbyte is not the same as Byte");
+static_assert(std::is_same<GLushort, UnsignedShort>::value, "GLushort is not the same as UnsignedShort");
+static_assert(std::is_same<GLshort, Short>::value, "GLshort is not the same as Short");
+static_assert(std::is_same<GLuint, UnsignedInt>::value, "GLuint is not the same as UnsignedInt");
+static_assert(std::is_same<GLint, Int>::value, "GLint is not the same as Int");
+static_assert(std::is_same<GLsizei, Int>::value, "GLsizei is not the same as Int");
+static_assert(std::is_same<GLfloat, Float>::value, "GLfloat is not the same as Float");
+#ifndef MAGNUM_TARGET_GLES
+static_assert(std::is_same<GLdouble, Double>::value, "GLdouble is not the same as Double");
+#endif
+
+}

src/OpenGL.h

@@ -0,0 +1,36 @@
+#ifndef Magnum_OpenGL_h
+#define Magnum_OpenGL_h
+/*
+    Copyright © 2010, 2011, 2012 Vladimír Vondruš <mosra@centrum.cz>
+
+    This file is part of Magnum.
+
+    Magnum is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License version 3
+    only, as published by the Free Software Foundation.
+
+    Magnum 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 Lesser General Public License version 3 for more details.
+*/
+
+/** @file
+ * @brief OpenGL headers
+ */
+
+#include "magnumConfigure.h"
+
+#ifndef MAGNUM_TARGET_GLES
+#include <GL/glew.h>
+#include <GL/glcorearb.h>
+#else
+#ifndef MAGNUM_TARGET_GLES2
+#include <GLES3/gl3.h>
+#else
+#include <GLES2/gl2.h>
+#include <GLES2/gl2ext.h>
+#endif
+#endif
+
+#endif

src/Platform/ExtensionWrangler.cpp

@@ -19,6 +19,7 @@
 #include <Utility/Debug.h>
 
 #include "Magnum.h"
+#include "OpenGL.h"
 
 namespace Magnum { namespace Platform {
 

src/Platform/GlutApplication.h

@@ -23,6 +23,7 @@
 
 #include "Math/Vector2.h"
 #include "Magnum.h"
+#include "OpenGL.h"
 
 #include <GL/freeglut.h>
 

src/Platform/GlxContextHandler.h

@@ -19,7 +19,7 @@
  * @brief Class Magnum::Platform::GlxContextHandler
  */
 
-#include "Magnum.h"
+#include "OpenGL.h"
 #include <GL/glx.h>
 /* undef Xlib nonsense to avoid conflicts */
 #undef Complex

src/Platform/WindowlessGlxApplication.h

@@ -19,7 +19,7 @@
  * @brief Class Magnum::Platform::WindowlessGlxApplication
  */
 
-#include "Magnum.h"
+#include "OpenGL.h"
 #include <GL/glx.h>
 #include <X11/Xlib.h>
 #include <X11/Xutil.h>
@@ -28,7 +28,8 @@
 #undef None
 #undef Always
 
-#include "AbstractContextHandler.h"
+#include "Magnum.h"
+#include "Platform/AbstractContextHandler.h"
 
 namespace Magnum { namespace Platform {
 

src/Query.h

@@ -20,7 +20,7 @@
  */
 
 #include "Magnum.h"
-
+#include "OpenGL.h"
 #include "magnumVisibility.h"
 
 namespace Magnum {

src/Renderbuffer.h

@@ -20,7 +20,7 @@
  */
 
 #include "Magnum.h"
-
+#include "OpenGL.h"
 #include "magnumVisibility.h"
 
 namespace Magnum {