Wii U / Video: Fixed resume of video after the home menu close

This bug happens just when V-Sync is off and attempting to open and close the home menu. To fix the black/frozen screen it's just enough to call the GX2SetSwapInterval(0); right after entering the foreground back.

Author: Wohlstand

src/video/wiiu/SDL_wiiuvideo.c

@@ -56,6 +56,7 @@
 #include <gx2/state.h>
 #include <gx2r/mem.h>
 #include <gx2r/surface.h>
+#include <gx2/swap.h>
 
 #define DRC_SCREEN_WIDTH    854
 #define DRC_SCREEN_HEIGHT   480
@@ -120,6 +121,9 @@ static int WIIU_ForegroundAcquired(_THIS)
 		window = window->next;
 	}
 
+	// Restore V-Sync state
+	GX2SetSwapInterval(videodata->prevSwapInterval);
+
 	return 0;
 }
 
@@ -135,6 +139,11 @@ static int WIIU_ForegroundReleased(_THIS)
 	videodata = (WIIU_VideoData *) _this->driverdata;
 	window = _this->windows;
 
+	// To avoid the black screen problem after resume when swap interval is 0,
+	// remember it, and restore when entering back the foreground
+	videodata->prevSwapInterval = GX2GetSwapInterval();
+	GX2SetSwapInterval(1);
+
 	// make sure the GPU is done drawing
 	GX2DrawDone();
 

src/video/wiiu/SDL_wiiuvideo.h

@@ -47,6 +47,7 @@ struct WIIU_VideoData
 	uint32_t tvHeight;
 	void *tvScanBuffer;
 	uint32_t tvScanBufferSize;
+	uint32_t prevSwapInterval;
 
 	GX2DrcRenderMode drcRenderMode;
 	void *drcScanBuffer;