3 files changed, 16 insertions(+), 2 deletions(-)

M src/devices/ppu.c
M src/devices/ppu.h
M src/main.c

@@ 58,6 58,15 @@ ppu_pixel(Ppu *p, uint8_t fg, uint16_t x, uint16_t y, uint8_t color)
 }
 
 void
+screen_wipe(Ppu *p, uint8_t fg, uint16_t x, uint16_t y)
+{
+	int v, h;
+	for(v = 0; v < 8; v++)
+		for(h = 0; h < 8; h++)
+			ppu_pixel(p, fg, x + h, y + v, 1);
+}
+
+void
 screen_blit(Ppu *p, uint8_t fg, uint16_t x, uint16_t y, uint8_t *sprite, uint8_t color, uint8_t flipx, uint8_t flipy, uint8_t twobpp)
 {
 	int v, h, opaque = (color % 5) || !color;

@@ 40,5 40,6 @@ typedef struct Ppu {
 
 int ppu_init(Ppu *p, uint32_t *framebuffer);
 void ppu_pixel(Ppu *p, uint8_t fg, uint16_t x, uint16_t y, uint8_t color);
+void screen_wipe(Ppu *p, uint8_t fg, uint16_t x, uint16_t y);
 void screen_blit(Ppu *p, uint8_t fg, uint16_t x, uint16_t y, uint8_t *sprite, uint8_t color, uint8_t flipx, uint8_t flipy, uint8_t twobpp);
 void render_all(Ppu *p);

@@ 131,8 131,12 @@ screen_deo(Uint8 *d, Uint8 port)
 		if(addr >= 0xfff0)
 			return;
 		for(i = 0; i <= n; i++) {
-			screen_blit(&ppu, fg, x + dy * i, y + dx * i, &u.ram[addr], d[0xf] & 0xf, d[0xf] & 0x10, d[0xf] & 0x20, twobpp);
-			addr += (d[0x6] & 0x04) << (1 + twobpp);
+			if(!(d[0xf] & 0xf))
+				screen_wipe(&ppu, fg, x + dy * i, y + dx * i);
+			else {
+				screen_blit(&ppu, fg, x + dy * i, y + dx * i, &u.ram[addr], d[0xf] & 0xf, d[0xf] & 0x10, d[0xf] & 0x20, twobpp);
+				addr += (d[0x6] & 0x04) << (1 + twobpp);
+			}
 		}
 		POKDEV(0xc, addr);   /* auto addr+length */
 		POKDEV(0x8, x + dx); /* auto x+8 */