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games/doom: use black background

--- a/sys/src/games/doom/i_video.c

+++ b/sys/src/games/doom/i_video.c

@@ -34,9 +34,11 @@

 void I_InitGraphics(void)

 {

-	if (initdraw(nil, nil, "doom") < 0)

+	if(initdraw(nil, nil, "doom") < 0)

 		I_Error("I_InitGraphics failed");

+	draw(screen, screen->r, display->black, nil, ZP);

+

 	center = addpt(screen->r.min, Pt(Dx(screen->r)/2, Dy(screen->r)/2));

 	grabout = insetrect(screen->r, Dx(screen->r)/8);

 	nocursor();

@@ -73,6 +75,10 @@

 		resized = 0;

 		if(getwindow(display, Refnone) < 0)

 			sysfatal("getwindow failed: %r");

+

+		/* make black background */

+		draw(screen, screen->r, display->black, nil, ZP);

+

 		center = addpt(screen->r.min, Pt(Dx(screen->r)/2, Dy(screen->r)/2));

 		grabout = insetrect(screen->r, Dx(screen->r)/8);

 	}