From b0cbb4066c3ea9e9fdb4e40a46f3b331c7a46e25 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vladim=C3=ADr=20Vondru=C5=A1?= <mosra@centrum.cz>
Date: Mon, 11 Aug 2014 23:23:19 +0200
Subject: [PATCH] Added definitions for OpenGL ES function pointers.

Using GLES extension functions in the code won't cause linker failures
anymore, but their addresses aren't being loaded yet. As said before,
NaCl and Emscripten is still a special case.
---
 src/Magnum/CMakeLists.txt                     |   8 +-
 .../OpenGL/GLES2/CMakeLists.txt               |  11 +
 src/MagnumExternal/OpenGL/GLES2/README.md     |   2 +-
 src/MagnumExternal/OpenGL/GLES2/flextGL.cpp   | 196 ++++++++++++++++++
 .../OpenGL/GLES2/flextGL.cpp.template         |  20 ++
 .../OpenGL/GLES3/CMakeLists.txt               |   8 +
 src/MagnumExternal/OpenGL/GLES3/README.md     |   5 +-
 src/MagnumExternal/OpenGL/GLES3/flextGL.cpp   | 123 +++++++++++
 .../OpenGL/GLES3/flextGL.cpp.template         |  20 ++
 9 files changed, 388 insertions(+), 5 deletions(-)
 create mode 100644 src/MagnumExternal/OpenGL/GLES2/flextGL.cpp
 create mode 100644 src/MagnumExternal/OpenGL/GLES2/flextGL.cpp.template
 create mode 100644 src/MagnumExternal/OpenGL/GLES3/flextGL.cpp
 create mode 100644 src/MagnumExternal/OpenGL/GLES3/flextGL.cpp.template

diff --git a/src/Magnum/CMakeLists.txt b/src/Magnum/CMakeLists.txt
index 38b7a1242..291762503 100644
--- a/src/Magnum/CMakeLists.txt
+++ b/src/Magnum/CMakeLists.txt
@@ -149,8 +149,7 @@ if(NOT TARGET_GLES)
         BufferTexture.cpp
         CubeMapTextureArray.cpp
         MultisampleTexture.cpp
-        RectangleTexture.cpp
-        $<TARGET_OBJECTS:MagnumFlextGLObjects>)
+        RectangleTexture.cpp)
 endif()
 
 # Non-ES2 stuff
@@ -163,6 +162,11 @@ if(NOT TARGET_GLES2)
         TextureArray.cpp)
 endif()
 
+# Link in GL function pointer variables on platforms that support it
+if(NOT CORRADE_TARGET_EMSCRIPTEN AND NOT CORRADE_TARGET_NACL)
+    list(APPEND Magnum_SRCS $<TARGET_OBJECTS:MagnumFlextGLObjects>)
+endif()
+
 # Files shared between main library and math unit test library
 set(MagnumMath_SRCS
     Math/Functions.cpp
diff --git a/src/MagnumExternal/OpenGL/GLES2/CMakeLists.txt b/src/MagnumExternal/OpenGL/GLES2/CMakeLists.txt
index e0106eebd..4c0924774 100644
--- a/src/MagnumExternal/OpenGL/GLES2/CMakeLists.txt
+++ b/src/MagnumExternal/OpenGL/GLES2/CMakeLists.txt
@@ -23,6 +23,17 @@
 #   DEALINGS IN THE SOFTWARE.
 #
 
+# NaCl and Emscripten don't have the ability to load function pointers manually
+if(NOT CORRADE_TARGET_NACL AND NOT CORRADE_TARGET_EMSCRIPTEN)
+    add_library(MagnumFlextGLObjects OBJECT flextGL.cpp)
+
+    if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" OR "${CMAKE_CXX_COMPILER_ID}" MATCHES "(Apple)?Clang")
+        set_target_properties(MagnumFlextGLObjects PROPERTIES COMPILE_FLAGS "${CMAKE_SHARED_LIBRARY_CXX_FLAGS} -fvisibility=hidden -DFlextGL_EXPORTS")
+    else()
+        set_target_properties(MagnumFlextGLObjects PROPERTIES COMPILE_FLAGS "${CMAKE_SHARED_LIBRARY_CXX_FLAGS} -DFlextGL_EXPORTS")
+    endif()
+endif()
+
 # NaCl and Emscripten are special, provide only some extensions for them
 if(CORRADE_TARGET_NACL)
     set(MagnumOpenGL_HEADERS flextGLNaCl.h)
diff --git a/src/MagnumExternal/OpenGL/GLES2/README.md b/src/MagnumExternal/OpenGL/GLES2/README.md
index c4edf1671..edabc8827 100644
--- a/src/MagnumExternal/OpenGL/GLES2/README.md
+++ b/src/MagnumExternal/OpenGL/GLES2/README.md
@@ -7,7 +7,7 @@ files for generic GLES2 implementations:
 
     .../flextGLgen.py -D . -t . extensions.txt
 
-It will generate `flextGL.h` file.
+It will generate `flextGL.h` and `flextGL.cpp` files.
 
 NaCl and Emscripten don't have the ability to manually load extension pointers,
 thus they have only header files:
diff --git a/src/MagnumExternal/OpenGL/GLES2/flextGL.cpp b/src/MagnumExternal/OpenGL/GLES2/flextGL.cpp
new file mode 100644
index 000000000..5e05d9df1
--- /dev/null
+++ b/src/MagnumExternal/OpenGL/GLES2/flextGL.cpp
@@ -0,0 +1,196 @@
+#include "flextGL.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* GL_ANGLE_framebuffer_blit */
+FLEXTGL_EXPORT void(APIENTRY *flextglBlitFramebufferANGLE)(GLint, GLint, GLint, GLint, GLint, GLint, GLint, GLint, GLbitfield, GLenum) = nullptr;
+
+/* GL_ANGLE_framebuffer_multisample */
+FLEXTGL_EXPORT void(APIENTRY *flextglRenderbufferStorageMultisampleANGLE)(GLenum, GLsizei, GLenum, GLsizei, GLsizei) = nullptr;
+
+/* GL_ANGLE_instanced_arrays */
+FLEXTGL_EXPORT void(APIENTRY *flextglDrawArraysInstancedANGLE)(GLenum, GLint, GLsizei, GLsizei) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglDrawElementsInstancedANGLE)(GLenum, GLsizei, GLenum, const void *, GLsizei) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglVertexAttribDivisorANGLE)(GLuint, GLuint) = nullptr;
+
+/* GL_APPLE_framebuffer_multisample */
+FLEXTGL_EXPORT void(APIENTRY *flextglRenderbufferStorageMultisampleAPPLE)(GLenum, GLsizei, GLenum, GLsizei, GLsizei) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglResolveMultisampleFramebufferAPPLE)(void) = nullptr;
+
+/* GL_EXT_discard_framebuffer */
+FLEXTGL_EXPORT void(APIENTRY *flextglDiscardFramebufferEXT)(GLenum, GLsizei, const GLenum *) = nullptr;
+
+/* GL_EXT_blend_minmax */
+FLEXTGL_EXPORT void(APIENTRY *flextglBlendEquationEXT)(GLenum) = nullptr;
+
+/* GL_EXT_occlusion_query_boolean */
+FLEXTGL_EXPORT void(APIENTRY *flextglGenQueriesEXT)(GLsizei, GLuint *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglDeleteQueriesEXT)(GLsizei, const GLuint *) = nullptr;
+FLEXTGL_EXPORT GLboolean(APIENTRY *flextglIsQueryEXT)(GLuint) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglBeginQueryEXT)(GLenum, GLuint) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglEndQueryEXT)(GLenum) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglGetQueryivEXT)(GLenum, GLenum, GLint *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglGetQueryObjectuivEXT)(GLuint, GLenum, GLuint *) = nullptr;
+
+/* GL_EXT_texture_storage */
+FLEXTGL_EXPORT void(APIENTRY *flextglTexStorage1DEXT)(GLenum, GLsizei, GLenum, GLsizei) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglTexStorage2DEXT)(GLenum, GLsizei, GLenum, GLsizei, GLsizei) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglTexStorage3DEXT)(GLenum, GLsizei, GLenum, GLsizei, GLsizei, GLsizei) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglTextureStorage1DEXT)(GLuint, GLenum, GLsizei, GLenum, GLsizei) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglTextureStorage2DEXT)(GLuint, GLenum, GLsizei, GLenum, GLsizei, GLsizei) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglTextureStorage3DEXT)(GLuint, GLenum, GLsizei, GLenum, GLsizei, GLsizei, GLsizei) = nullptr;
+
+/* GL_EXT_map_buffer_range */
+FLEXTGL_EXPORT void *(APIENTRY *flextglMapBufferRangeEXT)(GLenum, GLintptr, GLsizeiptr, GLbitfield) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglFlushMappedBufferRangeEXT)(GLenum, GLintptr, GLsizeiptr) = nullptr;
+
+/* GL_EXT_instanced_arrays */
+FLEXTGL_EXPORT void(APIENTRY *flextglDrawArraysInstancedEXT)(GLenum, GLint, GLsizei, GLsizei) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglDrawElementsInstancedEXT)(GLenum, GLsizei, GLenum, const void *, GLsizei) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglVertexAttribDivisorEXT)(GLuint, GLuint) = nullptr;
+
+/* GL_NV_draw_buffers */
+FLEXTGL_EXPORT void(APIENTRY *flextglDrawBuffersNV)(GLsizei, const GLenum *) = nullptr;
+
+/* GL_NV_read_buffer */
+FLEXTGL_EXPORT void(APIENTRY *flextglReadBufferNV)(GLenum) = nullptr;
+
+/* GL_NV_draw_instanced */
+FLEXTGL_EXPORT void(APIENTRY *flextglDrawArraysInstancedNV)(GLenum, GLint, GLsizei, GLsizei) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglDrawElementsInstancedNV)(GLenum, GLsizei, GLenum, const void *, GLsizei) = nullptr;
+
+/* GL_NV_framebuffer_blit */
+FLEXTGL_EXPORT void(APIENTRY *flextglBlitFramebufferNV)(GLint, GLint, GLint, GLint, GLint, GLint, GLint, GLint, GLbitfield, GLenum) = nullptr;
+
+/* GL_NV_framebuffer_multisample */
+FLEXTGL_EXPORT void(APIENTRY *flextglRenderbufferStorageMultisampleNV)(GLenum, GLsizei, GLenum, GLsizei, GLsizei) = nullptr;
+
+/* GL_NV_instanced_arrays */
+FLEXTGL_EXPORT void(APIENTRY *flextglVertexAttribDivisorNV)(GLuint, GLuint) = nullptr;
+
+/* GL_OES_texture_3D */
+FLEXTGL_EXPORT void(APIENTRY *flextglTexImage3DOES)(GLenum, GLint, GLenum, GLsizei, GLsizei, GLsizei, GLint, GLenum, GLenum, const void *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglTexSubImage3DOES)(GLenum, GLint, GLint, GLint, GLint, GLsizei, GLsizei, GLsizei, GLenum, GLenum, const void *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglCopyTexSubImage3DOES)(GLenum, GLint, GLint, GLint, GLint, GLint, GLint, GLsizei, GLsizei) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglCompressedTexImage3DOES)(GLenum, GLint, GLenum, GLsizei, GLsizei, GLsizei, GLint, GLsizei, const void *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglCompressedTexSubImage3DOES)(GLenum, GLint, GLint, GLint, GLint, GLsizei, GLsizei, GLsizei, GLenum, GLsizei, const void *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglFramebufferTexture3DOES)(GLenum, GLenum, GLenum, GLuint, GLint, GLint) = nullptr;
+
+/* GL_OES_vertex_array_object */
+FLEXTGL_EXPORT void(APIENTRY *flextglBindVertexArrayOES)(GLuint) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglDeleteVertexArraysOES)(GLsizei, const GLuint *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglGenVertexArraysOES)(GLsizei, GLuint *) = nullptr;
+FLEXTGL_EXPORT GLboolean(APIENTRY *flextglIsVertexArrayOES)(GLuint) = nullptr;
+
+/* GL_EXT_multi_draw_arrays */
+FLEXTGL_EXPORT void(APIENTRY *flextglMultiDrawArraysEXT)(GLenum, const GLint *, const GLsizei *, GLsizei) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglMultiDrawElementsEXT)(GLenum, const GLsizei *, GLenum, const void *const*, GLsizei) = nullptr;
+
+/* GL_EXT_debug_label */
+FLEXTGL_EXPORT void(APIENTRY *flextglLabelObjectEXT)(GLenum, GLuint, GLsizei, const GLchar *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglGetObjectLabelEXT)(GLenum, GLuint, GLsizei, GLsizei *, GLchar *) = nullptr;
+
+/* GL_EXT_debug_marker */
+FLEXTGL_EXPORT void(APIENTRY *flextglInsertEventMarkerEXT)(GLsizei, const GLchar *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglPushGroupMarkerEXT)(GLsizei, const GLchar *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglPopGroupMarkerEXT)(void) = nullptr;
+
+/* GL_EXT_disjoint_timer_query */
+FLEXTGL_EXPORT void(APIENTRY *flextglQueryCounterEXT)(GLuint, GLenum) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglGetQueryObjectivEXT)(GLuint, GLenum, GLint *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglGetQueryObjecti64vEXT)(GLuint, GLenum, GLint64 *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglGetQueryObjectui64vEXT)(GLuint, GLenum, GLuint64 *) = nullptr;
+
+/* GL_EXT_separate_shader_objects */
+FLEXTGL_EXPORT void(APIENTRY *flextglUseShaderProgramEXT)(GLenum, GLuint) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglActiveProgramEXT)(GLuint) = nullptr;
+FLEXTGL_EXPORT GLuint(APIENTRY *flextglCreateShaderProgramEXT)(GLenum, const GLchar *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglActiveShaderProgramEXT)(GLuint, GLuint) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglBindProgramPipelineEXT)(GLuint) = nullptr;
+FLEXTGL_EXPORT GLuint(APIENTRY *flextglCreateShaderProgramvEXT)(GLenum, GLsizei, const GLchar **) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglDeleteProgramPipelinesEXT)(GLsizei, const GLuint *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglGenProgramPipelinesEXT)(GLsizei, GLuint *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglGetProgramPipelineInfoLogEXT)(GLuint, GLsizei, GLsizei *, GLchar *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglGetProgramPipelineivEXT)(GLuint, GLenum, GLint *) = nullptr;
+FLEXTGL_EXPORT GLboolean(APIENTRY *flextglIsProgramPipelineEXT)(GLuint) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramParameteriEXT)(GLuint, GLenum, GLint) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform1fEXT)(GLuint, GLint, GLfloat) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform1fvEXT)(GLuint, GLint, GLsizei, const GLfloat *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform1iEXT)(GLuint, GLint, GLint) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform1ivEXT)(GLuint, GLint, GLsizei, const GLint *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform2fEXT)(GLuint, GLint, GLfloat, GLfloat) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform2fvEXT)(GLuint, GLint, GLsizei, const GLfloat *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform2iEXT)(GLuint, GLint, GLint, GLint) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform2ivEXT)(GLuint, GLint, GLsizei, const GLint *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform3fEXT)(GLuint, GLint, GLfloat, GLfloat, GLfloat) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform3fvEXT)(GLuint, GLint, GLsizei, const GLfloat *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform3iEXT)(GLuint, GLint, GLint, GLint, GLint) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform3ivEXT)(GLuint, GLint, GLsizei, const GLint *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform4fEXT)(GLuint, GLint, GLfloat, GLfloat, GLfloat, GLfloat) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform4fvEXT)(GLuint, GLint, GLsizei, const GLfloat *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform4iEXT)(GLuint, GLint, GLint, GLint, GLint, GLint) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform4ivEXT)(GLuint, GLint, GLsizei, const GLint *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniformMatrix2fvEXT)(GLuint, GLint, GLsizei, GLboolean, const GLfloat *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniformMatrix3fvEXT)(GLuint, GLint, GLsizei, GLboolean, const GLfloat *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniformMatrix4fvEXT)(GLuint, GLint, GLsizei, GLboolean, const GLfloat *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglUseProgramStagesEXT)(GLuint, GLbitfield, GLuint) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglValidateProgramPipelineEXT)(GLuint) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform1uiEXT)(GLuint, GLint, GLuint) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform2uiEXT)(GLuint, GLint, GLuint, GLuint) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform3uiEXT)(GLuint, GLint, GLuint, GLuint, GLuint) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform4uiEXT)(GLuint, GLint, GLuint, GLuint, GLuint, GLuint) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform1uivEXT)(GLuint, GLint, GLsizei, const GLuint *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform2uivEXT)(GLuint, GLint, GLsizei, const GLuint *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform3uivEXT)(GLuint, GLint, GLsizei, const GLuint *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform4uivEXT)(GLuint, GLint, GLsizei, const GLuint *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniformMatrix2x3fvEXT)(GLuint, GLint, GLsizei, GLboolean, const GLfloat *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniformMatrix3x2fvEXT)(GLuint, GLint, GLsizei, GLboolean, const GLfloat *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniformMatrix2x4fvEXT)(GLuint, GLint, GLsizei, GLboolean, const GLfloat *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniformMatrix4x2fvEXT)(GLuint, GLint, GLsizei, GLboolean, const GLfloat *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniformMatrix3x4fvEXT)(GLuint, GLint, GLsizei, GLboolean, const GLfloat *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniformMatrix4x3fvEXT)(GLuint, GLint, GLsizei, GLboolean, const GLfloat *) = nullptr;
+
+/* GL_EXT_multisampled_render_to_texture */
+FLEXTGL_EXPORT void(APIENTRY *flextglRenderbufferStorageMultisampleEXT)(GLenum, GLsizei, GLenum, GLsizei, GLsizei) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglFramebufferTexture2DMultisampleEXT)(GLenum, GLenum, GLenum, GLuint, GLint, GLsizei) = nullptr;
+
+/* GL_EXT_robustness */
+FLEXTGL_EXPORT GLenum(APIENTRY *flextglGetGraphicsResetStatusEXT)(void) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglReadnPixelsEXT)(GLint, GLint, GLsizei, GLsizei, GLenum, GLenum, GLsizei, void *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglGetnUniformfvEXT)(GLuint, GLint, GLsizei, GLfloat *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglGetnUniformivEXT)(GLuint, GLint, GLsizei, GLint *) = nullptr;
+
+/* GL_KHR_debug */
+FLEXTGL_EXPORT void(APIENTRY *flextglDebugMessageControl)(GLenum, GLenum, GLenum, GLsizei, const GLuint *, GLboolean) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglDebugMessageInsert)(GLenum, GLenum, GLuint, GLenum, GLsizei, const GLchar *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglDebugMessageCallback)(GLDEBUGPROC, const void *) = nullptr;
+FLEXTGL_EXPORT GLuint(APIENTRY *flextglGetDebugMessageLog)(GLuint, GLsizei, GLenum *, GLenum *, GLuint *, GLenum *, GLsizei *, GLchar *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglPushDebugGroup)(GLenum, GLuint, GLsizei, const GLchar *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglPopDebugGroup)(void) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglObjectLabel)(GLenum, GLuint, GLsizei, const GLchar *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglGetObjectLabel)(GLenum, GLuint, GLsizei, GLsizei *, GLchar *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglObjectPtrLabel)(const void *, GLsizei, const GLchar *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglGetObjectPtrLabel)(const void *, GLsizei, GLsizei *, GLchar *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglGetPointerv)(GLenum, void **) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglDebugMessageControlKHR)(GLenum, GLenum, GLenum, GLsizei, const GLuint *, GLboolean) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglDebugMessageInsertKHR)(GLenum, GLenum, GLuint, GLenum, GLsizei, const GLchar *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglDebugMessageCallbackKHR)(GLDEBUGPROCKHR, const void *) = nullptr;
+FLEXTGL_EXPORT GLuint(APIENTRY *flextglGetDebugMessageLogKHR)(GLuint, GLsizei, GLenum *, GLenum *, GLuint *, GLenum *, GLsizei *, GLchar *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglPushDebugGroupKHR)(GLenum, GLuint, GLsizei, const GLchar *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglPopDebugGroupKHR)(void) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglObjectLabelKHR)(GLenum, GLuint, GLsizei, const GLchar *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglGetObjectLabelKHR)(GLenum, GLuint, GLsizei, GLsizei *, GLchar *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglObjectPtrLabelKHR)(const void *, GLsizei, const GLchar *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglGetObjectPtrLabelKHR)(const void *, GLsizei, GLsizei *, GLchar *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglGetPointervKHR)(GLenum, void **) = nullptr;
+
+/* GL_OES_mapbuffer */
+FLEXTGL_EXPORT void *(APIENTRY *flextglMapBufferOES)(GLenum, GLenum) = nullptr;
+FLEXTGL_EXPORT GLboolean(APIENTRY *flextglUnmapBufferOES)(GLenum) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglGetBufferPointervOES)(GLenum, GLenum, void **) = nullptr;
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/src/MagnumExternal/OpenGL/GLES2/flextGL.cpp.template b/src/MagnumExternal/OpenGL/GLES2/flextGL.cpp.template
new file mode 100644
index 000000000..953aae2fd
--- /dev/null
+++ b/src/MagnumExternal/OpenGL/GLES2/flextGL.cpp.template
@@ -0,0 +1,20 @@
+@require(passthru, functions, enums, options, version, extensions)
+#include "flextGL.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+@for category,funcs in functions:
+@if len(funcs) > 0 and category not in ['ES_VERSION_2_0']:
+
+/* GL_@category */
+@for f in funcs:
+FLEXTGL_EXPORT @f.returntype\
+(APIENTRY *flextgl@f.name)(@f.param_type_list_string()) = nullptr;
+@end
+@end
+@end
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/src/MagnumExternal/OpenGL/GLES3/CMakeLists.txt b/src/MagnumExternal/OpenGL/GLES3/CMakeLists.txt
index 38046aa11..e38d9c5a4 100644
--- a/src/MagnumExternal/OpenGL/GLES3/CMakeLists.txt
+++ b/src/MagnumExternal/OpenGL/GLES3/CMakeLists.txt
@@ -23,4 +23,12 @@
 #   DEALINGS IN THE SOFTWARE.
 #
 
+add_library(MagnumFlextGLObjects OBJECT flextGL.cpp)
+
+if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" OR "${CMAKE_CXX_COMPILER_ID}" MATCHES "(Apple)?Clang")
+    set_target_properties(MagnumFlextGLObjects PROPERTIES COMPILE_FLAGS "${CMAKE_SHARED_LIBRARY_CXX_FLAGS} -fvisibility=hidden -DFlextGL_EXPORTS")
+else()
+    set_target_properties(MagnumFlextGLObjects PROPERTIES COMPILE_FLAGS "${CMAKE_SHARED_LIBRARY_CXX_FLAGS} -DFlextGL_EXPORTS")
+endif()
+
 install(FILES flextGL.h DESTINATION ${MAGNUM_EXTERNAL_INCLUDE_INSTALL_DIR}/OpenGL/GLES3)
diff --git a/src/MagnumExternal/OpenGL/GLES3/README.md b/src/MagnumExternal/OpenGL/GLES3/README.md
index 35405e48c..58942045c 100644
--- a/src/MagnumExternal/OpenGL/GLES3/README.md
+++ b/src/MagnumExternal/OpenGL/GLES3/README.md
@@ -6,5 +6,6 @@ Call `flextGLgen.py` in this directory with the following arguments:
 
     .../flextGLgen.py -D . -t . extensions.txt
 
-It will generate `flextGL.h` file. As usual, be sure to check the diff for
-suspicious changes and whitespace-at-EOL (although there shouldn't be any).
+It will generate `flextGL.h` and `flextGL.cpp` files. As usual, be sure to
+check the diff for suspicious changes and whitespace-at-EOL (although there
+shouldn't be any).
diff --git a/src/MagnumExternal/OpenGL/GLES3/flextGL.cpp b/src/MagnumExternal/OpenGL/GLES3/flextGL.cpp
new file mode 100644
index 000000000..224a3ca6a
--- /dev/null
+++ b/src/MagnumExternal/OpenGL/GLES3/flextGL.cpp
@@ -0,0 +1,123 @@
+#include "flextGL.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* GL_EXT_multi_draw_arrays */
+FLEXTGL_EXPORT void(APIENTRY *flextglMultiDrawArraysEXT)(GLenum, const GLint *, const GLsizei *, GLsizei) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglMultiDrawElementsEXT)(GLenum, const GLsizei *, GLenum, const void *const*, GLsizei) = nullptr;
+
+/* GL_EXT_debug_label */
+FLEXTGL_EXPORT void(APIENTRY *flextglLabelObjectEXT)(GLenum, GLuint, GLsizei, const GLchar *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglGetObjectLabelEXT)(GLenum, GLuint, GLsizei, GLsizei *, GLchar *) = nullptr;
+
+/* GL_EXT_debug_marker */
+FLEXTGL_EXPORT void(APIENTRY *flextglInsertEventMarkerEXT)(GLsizei, const GLchar *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglPushGroupMarkerEXT)(GLsizei, const GLchar *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglPopGroupMarkerEXT)(void) = nullptr;
+
+/* GL_EXT_disjoint_timer_query */
+FLEXTGL_EXPORT void(APIENTRY *flextglGenQueriesEXT)(GLsizei, GLuint *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglDeleteQueriesEXT)(GLsizei, const GLuint *) = nullptr;
+FLEXTGL_EXPORT GLboolean(APIENTRY *flextglIsQueryEXT)(GLuint) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglBeginQueryEXT)(GLenum, GLuint) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglEndQueryEXT)(GLenum) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglQueryCounterEXT)(GLuint, GLenum) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglGetQueryivEXT)(GLenum, GLenum, GLint *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglGetQueryObjectivEXT)(GLuint, GLenum, GLint *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglGetQueryObjectuivEXT)(GLuint, GLenum, GLuint *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglGetQueryObjecti64vEXT)(GLuint, GLenum, GLint64 *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglGetQueryObjectui64vEXT)(GLuint, GLenum, GLuint64 *) = nullptr;
+
+/* GL_EXT_separate_shader_objects */
+FLEXTGL_EXPORT void(APIENTRY *flextglUseShaderProgramEXT)(GLenum, GLuint) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglActiveProgramEXT)(GLuint) = nullptr;
+FLEXTGL_EXPORT GLuint(APIENTRY *flextglCreateShaderProgramEXT)(GLenum, const GLchar *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglActiveShaderProgramEXT)(GLuint, GLuint) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglBindProgramPipelineEXT)(GLuint) = nullptr;
+FLEXTGL_EXPORT GLuint(APIENTRY *flextglCreateShaderProgramvEXT)(GLenum, GLsizei, const GLchar **) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglDeleteProgramPipelinesEXT)(GLsizei, const GLuint *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglGenProgramPipelinesEXT)(GLsizei, GLuint *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglGetProgramPipelineInfoLogEXT)(GLuint, GLsizei, GLsizei *, GLchar *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglGetProgramPipelineivEXT)(GLuint, GLenum, GLint *) = nullptr;
+FLEXTGL_EXPORT GLboolean(APIENTRY *flextglIsProgramPipelineEXT)(GLuint) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramParameteriEXT)(GLuint, GLenum, GLint) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform1fEXT)(GLuint, GLint, GLfloat) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform1fvEXT)(GLuint, GLint, GLsizei, const GLfloat *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform1iEXT)(GLuint, GLint, GLint) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform1ivEXT)(GLuint, GLint, GLsizei, const GLint *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform2fEXT)(GLuint, GLint, GLfloat, GLfloat) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform2fvEXT)(GLuint, GLint, GLsizei, const GLfloat *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform2iEXT)(GLuint, GLint, GLint, GLint) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform2ivEXT)(GLuint, GLint, GLsizei, const GLint *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform3fEXT)(GLuint, GLint, GLfloat, GLfloat, GLfloat) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform3fvEXT)(GLuint, GLint, GLsizei, const GLfloat *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform3iEXT)(GLuint, GLint, GLint, GLint, GLint) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform3ivEXT)(GLuint, GLint, GLsizei, const GLint *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform4fEXT)(GLuint, GLint, GLfloat, GLfloat, GLfloat, GLfloat) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform4fvEXT)(GLuint, GLint, GLsizei, const GLfloat *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform4iEXT)(GLuint, GLint, GLint, GLint, GLint, GLint) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform4ivEXT)(GLuint, GLint, GLsizei, const GLint *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniformMatrix2fvEXT)(GLuint, GLint, GLsizei, GLboolean, const GLfloat *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniformMatrix3fvEXT)(GLuint, GLint, GLsizei, GLboolean, const GLfloat *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniformMatrix4fvEXT)(GLuint, GLint, GLsizei, GLboolean, const GLfloat *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglUseProgramStagesEXT)(GLuint, GLbitfield, GLuint) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglValidateProgramPipelineEXT)(GLuint) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform1uiEXT)(GLuint, GLint, GLuint) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform2uiEXT)(GLuint, GLint, GLuint, GLuint) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform3uiEXT)(GLuint, GLint, GLuint, GLuint, GLuint) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform4uiEXT)(GLuint, GLint, GLuint, GLuint, GLuint, GLuint) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform1uivEXT)(GLuint, GLint, GLsizei, const GLuint *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform2uivEXT)(GLuint, GLint, GLsizei, const GLuint *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform3uivEXT)(GLuint, GLint, GLsizei, const GLuint *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniform4uivEXT)(GLuint, GLint, GLsizei, const GLuint *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniformMatrix2x3fvEXT)(GLuint, GLint, GLsizei, GLboolean, const GLfloat *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniformMatrix3x2fvEXT)(GLuint, GLint, GLsizei, GLboolean, const GLfloat *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniformMatrix2x4fvEXT)(GLuint, GLint, GLsizei, GLboolean, const GLfloat *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniformMatrix4x2fvEXT)(GLuint, GLint, GLsizei, GLboolean, const GLfloat *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniformMatrix3x4fvEXT)(GLuint, GLint, GLsizei, GLboolean, const GLfloat *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglProgramUniformMatrix4x3fvEXT)(GLuint, GLint, GLsizei, GLboolean, const GLfloat *) = nullptr;
+
+/* GL_EXT_multisampled_render_to_texture */
+FLEXTGL_EXPORT void(APIENTRY *flextglRenderbufferStorageMultisampleEXT)(GLenum, GLsizei, GLenum, GLsizei, GLsizei) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglFramebufferTexture2DMultisampleEXT)(GLenum, GLenum, GLenum, GLuint, GLint, GLsizei) = nullptr;
+
+/* GL_EXT_robustness */
+FLEXTGL_EXPORT GLenum(APIENTRY *flextglGetGraphicsResetStatusEXT)(void) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglReadnPixelsEXT)(GLint, GLint, GLsizei, GLsizei, GLenum, GLenum, GLsizei, void *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglGetnUniformfvEXT)(GLuint, GLint, GLsizei, GLfloat *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglGetnUniformivEXT)(GLuint, GLint, GLsizei, GLint *) = nullptr;
+
+/* GL_KHR_debug */
+FLEXTGL_EXPORT void(APIENTRY *flextglDebugMessageControl)(GLenum, GLenum, GLenum, GLsizei, const GLuint *, GLboolean) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglDebugMessageInsert)(GLenum, GLenum, GLuint, GLenum, GLsizei, const GLchar *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglDebugMessageCallback)(GLDEBUGPROC, const void *) = nullptr;
+FLEXTGL_EXPORT GLuint(APIENTRY *flextglGetDebugMessageLog)(GLuint, GLsizei, GLenum *, GLenum *, GLuint *, GLenum *, GLsizei *, GLchar *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglPushDebugGroup)(GLenum, GLuint, GLsizei, const GLchar *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglPopDebugGroup)(void) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglObjectLabel)(GLenum, GLuint, GLsizei, const GLchar *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglGetObjectLabel)(GLenum, GLuint, GLsizei, GLsizei *, GLchar *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglObjectPtrLabel)(const void *, GLsizei, const GLchar *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglGetObjectPtrLabel)(const void *, GLsizei, GLsizei *, GLchar *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglGetPointerv)(GLenum, void **) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglDebugMessageControlKHR)(GLenum, GLenum, GLenum, GLsizei, const GLuint *, GLboolean) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglDebugMessageInsertKHR)(GLenum, GLenum, GLuint, GLenum, GLsizei, const GLchar *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglDebugMessageCallbackKHR)(GLDEBUGPROCKHR, const void *) = nullptr;
+FLEXTGL_EXPORT GLuint(APIENTRY *flextglGetDebugMessageLogKHR)(GLuint, GLsizei, GLenum *, GLenum *, GLuint *, GLenum *, GLsizei *, GLchar *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglPushDebugGroupKHR)(GLenum, GLuint, GLsizei, const GLchar *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglPopDebugGroupKHR)(void) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglObjectLabelKHR)(GLenum, GLuint, GLsizei, const GLchar *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglGetObjectLabelKHR)(GLenum, GLuint, GLsizei, GLsizei *, GLchar *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglObjectPtrLabelKHR)(const void *, GLsizei, const GLchar *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglGetObjectPtrLabelKHR)(const void *, GLsizei, GLsizei *, GLchar *) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglGetPointervKHR)(GLenum, void **) = nullptr;
+
+/* GL_OES_mapbuffer */
+FLEXTGL_EXPORT void *(APIENTRY *flextglMapBufferOES)(GLenum, GLenum) = nullptr;
+FLEXTGL_EXPORT GLboolean(APIENTRY *flextglUnmapBufferOES)(GLenum) = nullptr;
+FLEXTGL_EXPORT void(APIENTRY *flextglGetBufferPointervOES)(GLenum, GLenum, void **) = nullptr;
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/src/MagnumExternal/OpenGL/GLES3/flextGL.cpp.template b/src/MagnumExternal/OpenGL/GLES3/flextGL.cpp.template
new file mode 100644
index 000000000..43f61ce3e
--- /dev/null
+++ b/src/MagnumExternal/OpenGL/GLES3/flextGL.cpp.template
@@ -0,0 +1,20 @@
+@require(passthru, functions, enums, options, version, extensions)
+#include "flextGL.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+@for category,funcs in functions:
+@if len(funcs) > 0 and category not in ['ES_VERSION_2_0', 'ES_VERSION_3_0']:
+
+/* GL_@category */
+@for f in funcs:
+FLEXTGL_EXPORT @f.returntype\
+(APIENTRY *flextgl@f.name)(@f.param_type_list_string()) = nullptr;
+@end
+@end
+@end
+
+#ifdef __cplusplus
+}
+#endif