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Diffstat (limited to 'src/mame/video/pkunwar.c')
-rw-r--r--src/mame/video/pkunwar.c117
1 files changed, 117 insertions, 0 deletions
diff --git a/src/mame/video/pkunwar.c b/src/mame/video/pkunwar.c
new file mode 100644
index 00000000000..776e5732567
--- /dev/null
+++ b/src/mame/video/pkunwar.c
@@ -0,0 +1,117 @@
+/***************************************************************************
+
+ video.c
+
+ Functions to emulate the video hardware of the machine.
+
+***************************************************************************/
+
+#include "driver.h"
+
+
+static int flipscreen[2];
+
+
+WRITE8_HANDLER( pkunwar_flipscreen_w )
+{
+ if (flipscreen[0] != (data & 1))
+ {
+ flipscreen[0] = data & 1;
+ memset(dirtybuffer,1,videoram_size);
+ }
+ if (flipscreen[1] != (data & 2))
+ {
+ flipscreen[1] = data & 2;
+ memset(dirtybuffer,1,videoram_size);
+ }
+}
+
+
+
+VIDEO_UPDATE( pkunwar )
+{
+ int offs;
+
+
+ /* for every character in the Video RAM, check if it has been modified */
+ /* since last time and update it accordingly. */
+ for (offs = videoram_size - 1;offs >= 0;offs--)
+ {
+ if (dirtybuffer[offs])
+ {
+ int sx,sy;
+
+
+ dirtybuffer[offs] = 0;
+
+ sx = offs % 32;
+ sy = offs / 32;
+ if (flipscreen[0]) sx = 31 - sx;
+ if (flipscreen[1]) sy = 31 - sy;
+
+ drawgfx(tmpbitmap,machine->gfx[0],
+ videoram[offs] + ((colorram[offs] & 0x07) << 8),
+ (colorram[offs] & 0xf0) >> 4,
+ flipscreen[0],flipscreen[1],
+ 8*sx,8*sy,
+ &machine->screen[0].visarea,TRANSPARENCY_NONE,0);
+ }
+ }
+
+ /* copy the character mapped graphics */
+ copybitmap(bitmap,tmpbitmap,0,0,0,0,&machine->screen[0].visarea,TRANSPARENCY_NONE,0);
+
+
+ /* Draw the sprites. */
+ for (offs = 0;offs < spriteram_size;offs += 32)
+ {
+ int sx,sy,flipx,flipy;
+
+
+ sx = ((spriteram[offs + 1] + 8) & 0xff) - 8;
+ sy = spriteram[offs + 2];
+ flipx = spriteram[offs] & 0x01;
+ flipy = spriteram[offs] & 0x02;
+ if (flipscreen[0])
+ {
+ sx = 240 - sx;
+ flipx = !flipx;
+ }
+ if (flipscreen[1])
+ {
+ sy = 240 - sy;
+ flipy = !flipy;
+ }
+
+ drawgfx(bitmap,machine->gfx[1],
+ ((spriteram[offs] & 0xfc) >> 2) + ((spriteram[offs + 3] & 0x07) << 6),
+ (spriteram[offs + 3] & 0xf0) >> 4,
+ flipx,flipy,
+ sx,sy,
+ &machine->screen[0].visarea,TRANSPARENCY_PEN,0);
+ }
+
+
+ /* redraw characters which have priority over sprites */
+ for (offs = videoram_size - 1;offs >= 0;offs--)
+ {
+ if (colorram[offs] & 0x08)
+ {
+ int sx,sy;
+
+
+ sx = offs % 32;
+ sy = offs / 32;
+ if (flipscreen[0]) sx = 31 - sx;
+ if (flipscreen[1]) sy = 31 - sy;
+
+ drawgfx(bitmap,machine->gfx[0],
+ videoram[offs] + ((colorram[offs] & 0x07) << 8),
+ (colorram[offs] & 0xf0) >> 4,
+ flipscreen[0],flipscreen[1],
+ 8*sx,8*sy,
+ &machine->screen[0].visarea,TRANSPARENCY_PEN,0);
+ }
+ }
+ return 0;
+}