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/***************************************************************************
Taito Field Goal video emulation
***************************************************************************/
#include "driver.h"
#include "includes/fgoal.h"
static bitmap_t *fgbitmap;
static bitmap_t *bgbitmap;
static UINT8 xpos;
static UINT8 ypos;
static int current_color;
WRITE8_HANDLER( fgoal_color_w )
{
current_color = data & 3;
}
WRITE8_HANDLER( fgoal_ypos_w )
{
ypos = data;
}
WRITE8_HANDLER( fgoal_xpos_w )
{
xpos = data;
}
VIDEO_START( fgoal )
{
fgbitmap = video_screen_auto_bitmap_alloc(machine->primary_screen);
bgbitmap = video_screen_auto_bitmap_alloc(machine->primary_screen);
}
VIDEO_UPDATE( fgoal )
{
const UINT8* VRAM = fgoal_video_ram;
int x;
int y;
int n;
/* draw color overlay foreground and background */
if (fgoal_player == 1 && (input_port_read(screen->machine, "IN1") & 0x40))
{
drawgfxzoom_opaque(fgbitmap, cliprect, screen->machine->gfx[0],
0, (fgoal_player << 2) | current_color,
1, 1,
0, 16,
0x40000,
0x40000);
drawgfxzoom_opaque(bgbitmap, cliprect, screen->machine->gfx[1],
0, 0,
1, 1,
0, 16,
0x40000,
0x40000);
}
else
{
drawgfxzoom_opaque(fgbitmap, cliprect, screen->machine->gfx[0],
0, (fgoal_player << 2) | current_color,
0, 0,
0, 0,
0x40000,
0x40000);
drawgfxzoom_opaque(bgbitmap, cliprect, screen->machine->gfx[1],
0, 0,
0, 0,
0, 0,
0x40000,
0x40000);
}
/* the ball has a fixed color */
for (y = ypos; y < ypos + 8; y++)
{
for (x = xpos; x < xpos + 8; x++)
{
if (y < 256 && x < 256)
{
*BITMAP_ADDR16(fgbitmap, y, x) = 128 + 16;
}
}
}
/* draw bitmap layer */
for (y = 0; y < 256; y++)
{
UINT16* p = BITMAP_ADDR16(bitmap, y, 0);
const UINT16* FG = BITMAP_ADDR16(fgbitmap, y, 0);
const UINT16* BG = BITMAP_ADDR16(bgbitmap, y, 0);
for (x = 0; x < 256; x += 8)
{
UINT8 v = *VRAM++;
for (n = 0; n < 8; n++)
{
if (v & (1 << n))
{
p[x + n] = FG[x + n];
}
else
{
p[x + n] = BG[x + n];
}
}
}
}
return 0;
}
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