decouple repainting from blitting the FBO; draw touch overlay after FBO

[d2df-sdl.git] / src / game / sdl / g_system.pas

diff --git a/src/game/sdl/g_system.pas b/src/game/sdl/g_system.pas
index bba2caea3efb5b0c8fba366594002bec6f6057ed..c53a7b347596c44c4331497c94c7ee3a2cb524b0 100644 (file)
--- a/src/game/sdl/g_system.pas
+++ b/src/game/sdl/g_system.pas
@@ -70,6 +70,28 @@ implementation
 
   (* --------- Graphics --------- *)
 
+  function LoadGL: Boolean;
+  begin
+    result := true;
+    {$IFDEF NOGL_INIT}
+    nogl_Init;
+    if glRenderToFBO and (not nogl_ExtensionSupported('GL_OES_framebuffer_object')) then
+    {$ELSE}
+    if glRenderToFBO and (not Load_GL_ARB_framebuffer_object) then
+    {$ENDIF}
+    begin
+      e_LogWriteln('GL: framebuffer objects not supported; disabling FBO rendering');
+      glRenderToFBO := false;
+    end;
+  end;
+
+  procedure FreeGL;
+  begin
+    {$IFDEF NOGL_INIT}
+    nogl_Quit();
+    {$ENDIF}
+  end;
+
   procedure UpdateSize (w, h: Integer);
   begin
     gWinSizeX := w;
@@ -81,7 +103,13 @@ implementation
       // store real window size in gWinSize, downscale resolution now
       w := round(w / r_pixel_scale);
       h := round(h / r_pixel_scale);
-      e_ResizeFramebuffer(w, h);
+      if not e_ResizeFramebuffer(w, h) then
+      begin
+        e_LogWriteln('GL: could not create framebuffer, falling back to --no-fbo');
+        glRenderToFBO := False;
+        w := gWinSizeX;
+        h := gWinSizeY;
+      end;
     end;
     gScreenWidth := w;
     gScreenHeight := h;
@@ -125,15 +153,10 @@ implementation
       screen := SDL_SetVideoMode(w, h, bpp, flags);
       if screen <> nil then
       begin
-        {$IFDEF NOGL_INIT}
-        nogl_Init;
-        if glRenderToFBO and (not nogl_ExtensionSupported('GL_OES_framebuffer_object')) then
-        {$ELSE}
-        if glRenderToFBO and (not Load_GL_ARB_framebuffer_object()) then
-        {$ENDIF}
+        if not LoadGL then
         begin
-          e_LogWriteln('SDL: no framebuffer object support detected');
-          glRenderToFBO := False
+          e_LogWriteln('GL: unable to load OpenGL functions', TMsgType.Fatal);
+          exit;
         end;
         SDL_WM_SetCaption(GetTitle(), nil);
         gFullScreen := fullscreen;
@@ -150,8 +173,6 @@ implementation
 
   procedure sys_Repaint;
   begin
-    if glRenderToFBO then
-      e_BlitFramebuffer(gWinSizeX, gWinSizeY);
     SDL_GL_SwapBuffers
   end;
 
@@ -497,9 +518,7 @@ implementation
       RemoveJoystick(i);
     if screen <> nil then
     begin
-      {$IFDEF NOGL_INIT}
-        nogl_Quit;
-      {$ENDIF}
+      FreeGL;
       SDL_FreeSurface(screen)
     end;
     SDL_Quit