render: Mark viewport/cliprect dirty when window is resized.

Fixes #4751.

src/render/opengl/SDL_render_gl.c

@@ -1279,7 +1279,14 @@ GL_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *vertic
 
     data->drawstate.target = renderer->target;
     if (!data->drawstate.target) {
-        SDL_GL_GetDrawableSize(renderer->window, &data->drawstate.drawablew, &data->drawstate.drawableh);
+        int w, h;
+        SDL_GL_GetDrawableSize(renderer->window, &w, &h);
+        if ((w != data->drawstate.drawablew) || (h != data->drawstate.drawableh)) {
+            data->drawstate.viewport_dirty = SDL_TRUE;  // if the window dimensions changed, invalidate the current viewport, etc.
+            data->drawstate.cliprect_dirty = SDL_TRUE;
+            data->drawstate.drawablew = w;
+            data->drawstate.drawableh = h;
+        }
     }
 
 

src/render/opengles/SDL_render_gles.c

@@ -934,7 +934,15 @@ GLES_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *vert
     data->drawstate.target = renderer->target;
 
     if (!renderer->target) {
-        SDL_GL_GetDrawableSize(renderer->window, &data->drawstate.drawablew, &data->drawstate.drawableh);
+        int w, h;
+        SDL_GL_GetDrawableSize(renderer->window, &w, &h);
+        if ((w != data->drawstate.drawablew) || (h != data->drawstate.drawableh)) {
+            data->drawstate.viewport_dirty = SDL_TRUE;  // if the window dimensions changed, invalidate the current viewport, etc.
+            data->drawstate.cliprect_dirty = SDL_TRUE;
+            data->drawstate.drawablew = w;
+            data->drawstate.drawableh = h;
+        }
+
     }
 
     while (cmd) {

src/render/opengles2/SDL_render_gles2.c

@@ -1270,7 +1270,14 @@ GLES2_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *ver
 
     data->drawstate.target = renderer->target;
     if (!data->drawstate.target) {
-        SDL_GL_GetDrawableSize(renderer->window, &data->drawstate.drawablew, &data->drawstate.drawableh);
+        int w, h;
+        SDL_GL_GetDrawableSize(renderer->window, &w, &h);
+        if ((w != data->drawstate.drawablew) || (h != data->drawstate.drawableh)) {
+            data->drawstate.viewport_dirty = SDL_TRUE;  // if the window dimensions changed, invalidate the current viewport, etc.
+            data->drawstate.cliprect_dirty = SDL_TRUE;
+            data->drawstate.drawablew = w;
+            data->drawstate.drawableh = h;
+        }
     }
 
     /* upload the new VBO data for this set of commands. */

src/render/vitagxm/SDL_render_vita_gxm.c

@@ -987,7 +987,15 @@ VITA_GXM_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *
 
     data->drawstate.target = renderer->target;
     if (!data->drawstate.target) {
-        SDL_GL_GetDrawableSize(renderer->window, &data->drawstate.drawablew, &data->drawstate.drawableh);
+        int w, h;
+        SDL_GL_GetDrawableSize(renderer->window, &w, &h);
+        if ((w != data->drawstate.drawablew) || (h != data->drawstate.drawableh)) {
+            data->drawstate.viewport_dirty = SDL_TRUE;  // if the window dimensions changed, invalidate the current viewport, etc.
+            data->drawstate.cliprect_dirty = SDL_TRUE;
+            data->drawstate.drawablew = w;
+            data->drawstate.drawableh = h;
+        }
+
     }
 
     while (cmd) {