external: pack all dynamically loaded GL entrypoints into a giant str…

…uct.

On desktop this saves about 50 kB in symbols. Was done for Vulkan
already, this follows that (two years later). I need this in order to
solve the problem of static globals being unique across shared libs, and
it sounded better to export just one symbol instead of 689.

src/MagnumExternal/OpenGL/GL/flextGL.cpp.template

@@ -30,32 +30,37 @@
 extern "C" {
 #endif
 @for category,funcs in functions:
-@if len(funcs) > 0:
-@if category in ['VERSION_1_0', 'VERSION_1_1']:
+@if funcs and category in ['VERSION_1_0', 'VERSION_1_1']:
 
 /* GL_@category */
 @for f in funcs:
 #undef gl@f.name
 @end
 @for f in funcs:
-GLAPI @f.returntype APIENTRY gl@f.name\
+extern @f.returntype APIENTRY gl@f.name\
 (@f.param_type_list_string());
 @end
-@for f in funcs:
-FLEXTGL_EXPORT @f.returntype\
-(APIENTRY *flextgl@f.name)(@f.param_type_list_string()) = gl@f.name;
-@end
-@else:
-
-/* GL_@category */
-@for f in funcs:
-FLEXTGL_EXPORT @f.returntype\
-(APIENTRY *flextgl@f.name)(@f.param_type_list_string()) = nullptr;
-@end
-@end
 @end
 @end
 
+FlextGL flextGL{
+    @for category,funcs in functions:
+    @if funcs and category in ['VERSION_1_0', 'VERSION_1_1']:
+
+    /* GL_@category */
+    @for f in funcs:
+    gl@f.name,
+    @end
+    @elif funcs:
+
+    /* GL_@category */
+    @for f in funcs:
+    nullptr,
+    @end
+    @end
+    @end
+};
+
 #ifdef __cplusplus
 }
 #endif

src/MagnumExternal/OpenGL/GL/flextGL.h.template

@@ -91,9 +91,6 @@ void flextGLInit(Magnum::GL::Context& context);
 #ifndef APIENTRY
 #define APIENTRY
 #endif
-#ifndef GLAPI
-#define GLAPI extern
-#endif
 
 /* GL version defines. Needs to be done to avoid conflicting definitions with
    other GL headers (such as qopengl.h in Qt, which has different definition
@@ -112,20 +109,37 @@ void flextGLInit(Magnum::GL::Context& context);
 
 @enums
 
-/* Function prototypes */
+/* Function prototypes. Put into a struct in order to handle thread-localness
+   and globals unique across shared libs, this also means way less symbols is
+   exported, saving on binary size. Contexts on NVidia 390 drivers don't have
+   correct statically linked GL 1.0 and 1.1 functions (such as glGetString())
+   and one has to retrieve them explicitly using eglGetProcAddress(), which is
+   why those functions aren't listed as direct prototypes. */
+struct FlextGL {
+    @for cat,funcs in functions:
+    @if funcs:
+
+    /* GL_@cat */
+
+    @for f in funcs:
+    @f.returntype\
+(APIENTRY *@f.name)(@f.param_type_list_string());
+    @end
+    @end
+    @end
+};
+
+extern FLEXTGL_EXPORT FlextGL flextGL;
 @for cat,funcs in functions:
 @if funcs:
 
 /* GL_@cat */
 
-    @for f in funcs:
-GLAPI FLEXTGL_EXPORT @f.returntype\
-(APIENTRY *flextgl@f.name)(@f.param_type_list_string());
-#define gl@f.name flextgl@f.name
-    @end
+@for f in funcs:
+#define gl@f.name flextGL.@f.name
+@end
 @end
 @end
-
 #endif
 
 #ifdef __cplusplus

src/MagnumExternal/OpenGL/GL/flextGLPlatform.cpp.template

@@ -53,7 +53,7 @@ void flextGLInit(Magnum::GL::Context& context) {
 
             /* GL_@category */
             @for f in funcs:
-            flextgl@f.name = reinterpret_cast<@f.returntype\
+            flextGL.@f.name = reinterpret_cast<@f.returntype\
 (APIENTRY*)(@f.param_type_list_string())>(loader.load("gl@f.name"));
             @end
             @end
@@ -68,7 +68,7 @@ void flextGLInit(Magnum::GL::Context& context) {
 
     /* GL_@category */
     @for f in funcs:
-    flextgl@f.name = reinterpret_cast<@f.returntype\
+    flextGL.@f.name = reinterpret_cast<@f.returntype\
 (APIENTRY*)(@f.param_type_list_string())>(loader.load("gl@f.name"));
     @end
     @end

src/MagnumExternal/OpenGL/GLES2/flextGL.cpp

@@ -29,197 +29,7 @@
 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_debug_label */
-FLEXTGL_EXPORT void(APIENTRY *flextglGetObjectLabelEXT)(GLenum, GLuint, GLsizei, GLsizei *, GLchar *) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglLabelObjectEXT)(GLenum, GLuint, GLsizei, const GLchar *) = nullptr;
-
-/* GL_EXT_debug_marker */
-FLEXTGL_EXPORT void(APIENTRY *flextglInsertEventMarkerEXT)(GLsizei, const GLchar *) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglPopGroupMarkerEXT)(void) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglPushGroupMarkerEXT)(GLsizei, const GLchar *) = nullptr;
-
-/* GL_EXT_discard_framebuffer */
-FLEXTGL_EXPORT void(APIENTRY *flextglDiscardFramebufferEXT)(GLenum, GLsizei, const GLenum *) = nullptr;
-
-/* GL_EXT_disjoint_timer_query */
-FLEXTGL_EXPORT void(APIENTRY *flextglGetInteger64vEXT)(GLenum, GLint64 *) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglGetQueryObjecti64vEXT)(GLuint, GLenum, GLint64 *) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglGetQueryObjectivEXT)(GLuint, GLenum, GLint *) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglGetQueryObjectui64vEXT)(GLuint, GLenum, GLuint64 *) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglQueryCounterEXT)(GLuint, GLenum) = nullptr;
-
-/* GL_EXT_draw_buffers */
-FLEXTGL_EXPORT void(APIENTRY *flextglDrawBuffersEXT)(GLsizei, const GLenum *) = nullptr;
-
-/* GL_EXT_draw_buffers_indexed */
-FLEXTGL_EXPORT void(APIENTRY *flextglBlendEquationSeparateiEXT)(GLuint, GLenum, GLenum) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglBlendEquationiEXT)(GLuint, GLenum) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglBlendFuncSeparateiEXT)(GLuint, GLenum, GLenum, GLenum, GLenum) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglBlendFunciEXT)(GLuint, GLenum, GLenum) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglColorMaskiEXT)(GLuint, GLboolean, GLboolean, GLboolean, GLboolean) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglDisableiEXT)(GLenum, GLuint) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglEnableiEXT)(GLenum, GLuint) = nullptr;
-FLEXTGL_EXPORT GLboolean(APIENTRY *flextglIsEnablediEXT)(GLenum, GLuint) = 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_EXT_map_buffer_range */
-FLEXTGL_EXPORT void(APIENTRY *flextglFlushMappedBufferRangeEXT)(GLenum, GLintptr, GLsizeiptr) = nullptr;
-FLEXTGL_EXPORT void *(APIENTRY *flextglMapBufferRangeEXT)(GLenum, GLintptr, GLsizeiptr, GLbitfield) = 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_multisampled_render_to_texture */
-FLEXTGL_EXPORT void(APIENTRY *flextglFramebufferTexture2DMultisampleEXT)(GLenum, GLenum, GLenum, GLuint, GLint, GLsizei) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglRenderbufferStorageMultisampleEXT)(GLenum, GLsizei, GLenum, GLsizei, GLsizei) = nullptr;
-
-/* GL_EXT_occlusion_query_boolean */
-FLEXTGL_EXPORT void(APIENTRY *flextglBeginQueryEXT)(GLenum, GLuint) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglDeleteQueriesEXT)(GLsizei, const GLuint *) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglEndQueryEXT)(GLenum) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglGenQueriesEXT)(GLsizei, GLuint *) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglGetQueryObjectuivEXT)(GLuint, GLenum, GLuint *) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglGetQueryivEXT)(GLenum, GLenum, GLint *) = nullptr;
-FLEXTGL_EXPORT GLboolean(APIENTRY *flextglIsQueryEXT)(GLuint) = nullptr;
-
-/* GL_EXT_polygon_offset_clamp */
-FLEXTGL_EXPORT void(APIENTRY *flextglPolygonOffsetClampEXT)(GLfloat, GLfloat, GLfloat) = nullptr;
-
-/* GL_EXT_robustness */
-FLEXTGL_EXPORT GLenum(APIENTRY *flextglGetGraphicsResetStatusEXT)(void) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglGetnUniformfvEXT)(GLuint, GLint, GLsizei, GLfloat *) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglGetnUniformivEXT)(GLuint, GLint, GLsizei, GLint *) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglReadnPixelsEXT)(GLint, GLint, GLsizei, GLsizei, GLenum, GLenum, GLsizei, void *) = nullptr;
-
-/* GL_EXT_separate_shader_objects */
-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;
-
-/* GL_EXT_texture_border_clamp */
-FLEXTGL_EXPORT void(APIENTRY *flextglGetSamplerParameterIivEXT)(GLuint, GLenum, GLint *) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglGetSamplerParameterIuivEXT)(GLuint, GLenum, GLuint *) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglGetTexParameterIivEXT)(GLenum, GLenum, GLint *) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglGetTexParameterIuivEXT)(GLenum, GLenum, GLuint *) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglSamplerParameterIivEXT)(GLuint, GLenum, const GLint *) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglSamplerParameterIuivEXT)(GLuint, GLenum, const GLuint *) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglTexParameterIivEXT)(GLenum, GLenum, const GLint *) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglTexParameterIuivEXT)(GLenum, GLenum, const GLuint *) = nullptr;
-
-/* GL_EXT_texture_storage */
-FLEXTGL_EXPORT void(APIENTRY *flextglTexStorage2DEXT)(GLenum, GLsizei, GLenum, GLsizei, GLsizei) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglTexStorage3DEXT)(GLenum, GLsizei, GLenum, GLsizei, GLsizei, GLsizei) = nullptr;
-
-/* GL_KHR_blend_equation_advanced */
-FLEXTGL_EXPORT void(APIENTRY *flextglBlendBarrierKHR)(void) = nullptr;
-
-/* GL_KHR_debug */
-FLEXTGL_EXPORT void(APIENTRY *flextglDebugMessageCallbackKHR)(GLDEBUGPROCKHR, const 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 GLuint(APIENTRY *flextglGetDebugMessageLogKHR)(GLuint, GLsizei, GLenum *, GLenum *, GLuint *, GLenum *, GLsizei *, GLchar *) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglGetObjectLabelKHR)(GLenum, GLuint, GLsizei, GLsizei *, GLchar *) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglGetObjectPtrLabelKHR)(const void *, GLsizei, GLsizei *, GLchar *) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglGetPointervKHR)(GLenum, void **) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglObjectLabelKHR)(GLenum, GLuint, GLsizei, const GLchar *) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglObjectPtrLabelKHR)(const void *, GLsizei, const GLchar *) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglPopDebugGroupKHR)(void) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglPushDebugGroupKHR)(GLenum, GLuint, GLsizei, const GLchar *) = nullptr;
-
-/* GL_KHR_robustness */
-FLEXTGL_EXPORT GLenum(APIENTRY *flextglGetGraphicsResetStatusKHR)(void) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglGetnUniformfvKHR)(GLuint, GLint, GLsizei, GLfloat *) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglGetnUniformivKHR)(GLuint, GLint, GLsizei, GLint *) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglGetnUniformuivKHR)(GLuint, GLint, GLsizei, GLuint *) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglReadnPixelsKHR)(GLint, GLint, GLsizei, GLsizei, GLenum, GLenum, GLsizei, void *) = nullptr;
-
-/* GL_NV_draw_buffers */
-FLEXTGL_EXPORT void(APIENTRY *flextglDrawBuffersNV)(GLsizei, const 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_NV_polygon_mode */
-FLEXTGL_EXPORT void(APIENTRY *flextglPolygonModeNV)(GLenum, GLenum) = nullptr;
-
-/* GL_NV_read_buffer */
-FLEXTGL_EXPORT void(APIENTRY *flextglReadBufferNV)(GLenum) = nullptr;
-
-/* GL_OES_mapbuffer */
-FLEXTGL_EXPORT void(APIENTRY *flextglGetBufferPointervOES)(GLenum, GLenum, void **) = nullptr;
-FLEXTGL_EXPORT void *(APIENTRY *flextglMapBufferOES)(GLenum, GLenum) = nullptr;
-FLEXTGL_EXPORT GLboolean(APIENTRY *flextglUnmapBufferOES)(GLenum) = nullptr;
-
-/* GL_OES_texture_3D */
-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 *flextglCopyTexSubImage3DOES)(GLenum, GLint, GLint, GLint, GLint, GLint, GLint, GLsizei, GLsizei) = nullptr;
-FLEXTGL_EXPORT void(APIENTRY *flextglFramebufferTexture3DOES)(GLenum, GLenum, GLenum, GLuint, GLint, GLint) = nullptr;
-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;
-
-/* 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;
+FlextGL flextGL{};
 
 #ifdef __cplusplus
 }

src/MagnumExternal/OpenGL/GLES2/flextGL.cpp.template

@@ -29,16 +29,8 @@
 #ifdef __cplusplus
 extern "C" {
 #endif
-@for category,funcs in functions:
-@if funcs 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
+
+FlextGL flextGL{};
 
 #ifdef __cplusplus
 }