Add SDL_GL_ResetAttributes.

include/SDL_video.h

@@ -865,6 +865,11 @@ extern DECLSPEC void SDLCALL SDL_GL_UnloadLibrary(void);
 extern DECLSPEC SDL_bool SDLCALL SDL_GL_ExtensionSupported(const char
                                                            *extension);
 
+/**
+ *  \brief Reset all previously set OpenGL context attributes to their default values
+ */
+extern DECLSPEC void SDLCALL SDL_GL_ResetAttributes(void);
+
 /**
  *  \brief Set an OpenGL window attribute before window creation.
  */

src/dynapi/SDL_dynapi_overrides.h

@@ -570,3 +570,4 @@
 #define SDL_GL_DeleteContext SDL_GL_DeleteContext_REAL
 #define SDL_vsscanf SDL_vsscanf_REAL
 #define SDL_GameControllerAddMappingsFromRW SDL_GameControllerAddMappingsFromRW_REAL
+#define SDL_GL_ResetAttributes SDL_GL_ResetAttributes_REAL

src/dynapi/SDL_dynapi_procs.h

@@ -599,3 +599,4 @@ SDL_DYNAPI_PROC(void,SDL_GL_SwapWindow,(SDL_Window *a),(a),)
 SDL_DYNAPI_PROC(void,SDL_GL_DeleteContext,(SDL_GLContext a),(a),)
 SDL_DYNAPI_PROC(int,SDL_vsscanf,(const char *a, const char *b, va_list c),(a,b,c),return)
 SDL_DYNAPI_PROC(int,SDL_GameControllerAddMappingsFromRW,(SDL_RWops *a, int b),(a,b),return)
+SDL_DYNAPI_PROC(void,SDL_GL_ResetAttributes,(void),(),)

src/video/SDL_video.c

@@ -477,39 +477,7 @@ SDL_VideoInit(const char *driver_name)
     /* Set some very sane GL defaults */
     _this->gl_config.driver_loaded = 0;
     _this->gl_config.dll_handle = NULL;
-    _this->gl_config.red_size = 3;
-    _this->gl_config.green_size = 3;
-    _this->gl_config.blue_size = 2;
-    _this->gl_config.alpha_size = 0;
-    _this->gl_config.buffer_size = 0;
-    _this->gl_config.depth_size = 16;
-    _this->gl_config.stencil_size = 0;
-    _this->gl_config.double_buffer = 1;
-    _this->gl_config.accum_red_size = 0;
-    _this->gl_config.accum_green_size = 0;
-    _this->gl_config.accum_blue_size = 0;
-    _this->gl_config.accum_alpha_size = 0;
-    _this->gl_config.stereo = 0;
-    _this->gl_config.multisamplebuffers = 0;
-    _this->gl_config.multisamplesamples = 0;
-    _this->gl_config.retained_backing = 1;
-    _this->gl_config.accelerated = -1;  /* accelerated or not, both are fine */
-    _this->gl_config.profile_mask = 0;
-#if SDL_VIDEO_OPENGL
-    _this->gl_config.major_version = 2;
-    _this->gl_config.minor_version = 1;
-#elif SDL_VIDEO_OPENGL_ES2
-    _this->gl_config.major_version = 2;
-    _this->gl_config.minor_version = 0;
-    _this->gl_config.profile_mask = SDL_GL_CONTEXT_PROFILE_ES;   
-#elif SDL_VIDEO_OPENGL_ES
-    _this->gl_config.major_version = 1;
-    _this->gl_config.minor_version = 1;
-    _this->gl_config.profile_mask = SDL_GL_CONTEXT_PROFILE_ES;
-#endif
-    _this->gl_config.flags = 0;
-    
-    _this->gl_config.share_with_current_context = 0;
+    SDL_GL_ResetAttributes();
 
     _this->current_glwin_tls = SDL_TLSCreate();
     _this->current_glctx_tls = SDL_TLSCreate();
@@ -2547,6 +2515,49 @@ SDL_GL_ExtensionSupported(const char *extension)
 #endif
 }
 
+void
+SDL_GL_ResetAttributes()
+{
+    if (!_this) {
+        return;
+    }
+
+    _this->gl_config.red_size = 3;
+    _this->gl_config.green_size = 3;
+    _this->gl_config.blue_size = 2;
+    _this->gl_config.alpha_size = 0;
+    _this->gl_config.buffer_size = 0;
+    _this->gl_config.depth_size = 16;
+    _this->gl_config.stencil_size = 0;
+    _this->gl_config.double_buffer = 1;
+    _this->gl_config.accum_red_size = 0;
+    _this->gl_config.accum_green_size = 0;
+    _this->gl_config.accum_blue_size = 0;
+    _this->gl_config.accum_alpha_size = 0;
+    _this->gl_config.stereo = 0;
+    _this->gl_config.multisamplebuffers = 0;
+    _this->gl_config.multisamplesamples = 0;
+    _this->gl_config.retained_backing = 1;
+    _this->gl_config.accelerated = -1;  /* accelerated or not, both are fine */
+    _this->gl_config.profile_mask = 0;
+#if SDL_VIDEO_OPENGL
+    _this->gl_config.major_version = 2;
+    _this->gl_config.minor_version = 1;
+#elif SDL_VIDEO_OPENGL_ES2
+    _this->gl_config.major_version = 2;
+    _this->gl_config.minor_version = 0;
+    _this->gl_config.profile_mask = SDL_GL_CONTEXT_PROFILE_ES;
+#elif SDL_VIDEO_OPENGL_ES
+    _this->gl_config.major_version = 1;
+    _this->gl_config.minor_version = 1;
+    _this->gl_config.profile_mask = SDL_GL_CONTEXT_PROFILE_ES;
+#endif
+    _this->gl_config.flags = 0;
+    _this->gl_config.framebuffer_srgb_capable = 0;
+
+    _this->gl_config.share_with_current_context = 0;
+}
+
 int
 SDL_GL_SetAttribute(SDL_GLattr attr, int value)
 {