Add a couple of fixes to allow double buffering to work

[picodrive.git] / platform / common / plat_sdl.c

diff --git a/platform/common/plat_sdl.c b/platform/common/plat_sdl.c
index 600af45..fc7b200 100644 (file)
--- a/platform/common/plat_sdl.c
+++ b/platform/common/plat_sdl.c
@@ -125,9 +125,11 @@ void plat_video_flip(void)
                gl_flip(shadow_fb, g_screen_width, g_screen_height);
        }
        else {
-               // XXX: no locking, but should be fine with SDL_SWSURFACE?
+               if (SDL_MUSTLOCK(plat_sdl_screen))
+                       SDL_UnlockSurface(plat_sdl_screen);
                SDL_Flip(plat_sdl_screen);
                g_screen_ptr = plat_sdl_screen->pixels;
+               PicoDrawSetOutBuf(g_screen_ptr, g_screen_width * 2);
        }
 }
 
@@ -147,7 +149,8 @@ void plat_video_menu_begin(void)
                g_menuscreen_ptr = shadow_fb;
        }
        else {
-               SDL_LockSurface(plat_sdl_screen);
+               if (SDL_MUSTLOCK(plat_sdl_screen))
+                       SDL_LockSurface(plat_sdl_screen);
                g_menuscreen_ptr = plat_sdl_screen->pixels;
        }
 }
@@ -169,7 +172,8 @@ void plat_video_menu_end(void)
                gl_flip(g_menuscreen_ptr, g_menuscreen_w, g_menuscreen_h);
        }
        else {
-               SDL_UnlockSurface(plat_sdl_screen);
+               if (SDL_MUSTLOCK(plat_sdl_screen))
+                       SDL_UnlockSurface(plat_sdl_screen);
                SDL_Flip(plat_sdl_screen);
        }
        g_menuscreen_ptr = NULL;
@@ -188,9 +192,11 @@ void plat_video_loop_prepare(void)
                g_screen_ptr = shadow_fb;
        }
        else {
-               SDL_LockSurface(plat_sdl_screen);
+               if (SDL_MUSTLOCK(plat_sdl_screen))
+                       SDL_LockSurface(plat_sdl_screen);
                g_screen_ptr = plat_sdl_screen->pixels;
        }
+       PicoDrawSetOutBuf(g_screen_ptr, g_screen_width * 2);
 }
 
 void plat_early_init(void)