Improve window recreation logic in OpenGL* renderers

src/render/opengl/SDL_render_gl.c

@@ -32,8 +32,12 @@
 #include <OpenGL/OpenGL.h>
 #endif
 
+/* To prevent unnecessary window recreation, 
+ * these should match the defaults selected in SDL_GL_ResetAttributes 
+ */
+
 #define RENDERER_CONTEXT_MAJOR 2
-#define RENDERER_CONTEXT_MINOR 0
+#define RENDERER_CONTEXT_MINOR 1
 
 /* OpenGL renderer implementation */
 
@@ -389,13 +393,14 @@ GL_CreateRenderer(SDL_Window * window, Uint32 flags)
     SDL_GL_GetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, &major);
     SDL_GL_GetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, &minor);
     
-    SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
-    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, RENDERER_CONTEXT_MAJOR);
-    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, RENDERER_CONTEXT_MINOR);
-
     window_flags = SDL_GetWindowFlags(window);
     if (!(window_flags & SDL_WINDOW_OPENGL) ||
-        profile_mask != SDL_GL_CONTEXT_PROFILE_CORE || major != RENDERER_CONTEXT_MAJOR || minor != RENDERER_CONTEXT_MINOR) {
+        profile_mask == SDL_GL_CONTEXT_PROFILE_ES || major != RENDERER_CONTEXT_MAJOR || minor != RENDERER_CONTEXT_MINOR) {
+        
+        SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, 0);
+        SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, RENDERER_CONTEXT_MAJOR);
+        SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, RENDERER_CONTEXT_MINOR);
+
         if (SDL_RecreateWindow(window, window_flags | SDL_WINDOW_OPENGL) < 0) {
             /* Uh oh, better try to put it back... */
             SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, profile_mask);

src/render/opengles/SDL_render_gles.c

@@ -26,6 +26,10 @@
 #include "SDL_opengles.h"
 #include "../SDL_sysrender.h"
 
+/* To prevent unnecessary window recreation, 
+ * these should match the defaults selected in SDL_GL_ResetAttributes 
+ */
+
 #define RENDERER_CONTEXT_MAJOR 1
 #define RENDERER_CONTEXT_MINOR 1
 
@@ -288,13 +292,14 @@ GLES_CreateRenderer(SDL_Window * window, Uint32 flags)
     SDL_GL_GetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, &major);
     SDL_GL_GetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, &minor);
 
-    SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_ES);
-    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, RENDERER_CONTEXT_MAJOR);
-    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, RENDERER_CONTEXT_MINOR);
-
     windowFlags = SDL_GetWindowFlags(window);
     if (!(windowFlags & SDL_WINDOW_OPENGL) ||
         profile_mask != SDL_GL_CONTEXT_PROFILE_ES || major != RENDERER_CONTEXT_MAJOR || minor != RENDERER_CONTEXT_MINOR) {
+
+        SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_ES);
+        SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, RENDERER_CONTEXT_MAJOR);
+        SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, RENDERER_CONTEXT_MINOR);
+
         if (SDL_RecreateWindow(window, windowFlags | SDL_WINDOW_OPENGL) < 0) {
             /* Uh oh, better try to put it back... */
             SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, profile_mask);

src/render/opengles2/SDL_render_gles2.c

@@ -28,6 +28,9 @@
 #include "../../video/SDL_blit.h"
 #include "SDL_shaders_gles2.h"
 
+/* To prevent unnecessary window recreation, 
+ * these should match the defaults selected in SDL_GL_ResetAttributes 
+ */
 #define RENDERER_CONTEXT_MAJOR 2
 #define RENDERER_CONTEXT_MINOR 0
 
@@ -1749,13 +1752,14 @@ GLES2_CreateRenderer(SDL_Window *window, Uint32 flags)
     SDL_GL_GetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, &major);
     SDL_GL_GetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, &minor);
 
-    SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_ES);
-    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, RENDERER_CONTEXT_MAJOR);
-    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, RENDERER_CONTEXT_MINOR);
-
     windowFlags = SDL_GetWindowFlags(window);
     if (!(windowFlags & SDL_WINDOW_OPENGL) ||
         profile_mask != SDL_GL_CONTEXT_PROFILE_ES || major != RENDERER_CONTEXT_MAJOR || minor != RENDERER_CONTEXT_MINOR) {
+        
+        SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_ES);
+        SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, RENDERER_CONTEXT_MAJOR);
+        SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, RENDERER_CONTEXT_MINOR);
+
         if (SDL_RecreateWindow(window, windowFlags | SDL_WINDOW_OPENGL) < 0) {
             /* Uh oh, better try to put it back... */
             SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, profile_mask);