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Diffstat (limited to 'src/mame/video/sidepckt.c')
-rw-r--r--src/mame/video/sidepckt.c149
1 files changed, 149 insertions, 0 deletions
diff --git a/src/mame/video/sidepckt.c b/src/mame/video/sidepckt.c
new file mode 100644
index 00000000000..7f5b0163fa3
--- /dev/null
+++ b/src/mame/video/sidepckt.c
@@ -0,0 +1,149 @@
+#include "driver.h"
+
+
+static tilemap *bg_tilemap;
+static int flipscreen;
+
+
+PALETTE_INIT( sidepckt )
+{
+ int i;
+
+ for (i = 0;i < machine->drv->total_colors;i++)
+ {
+ int bit0,bit1,bit2,bit3,r,g,b;
+
+ /* red component */
+ bit0 = (color_prom[i] >> 4) & 0x01;
+ bit1 = (color_prom[i] >> 5) & 0x01;
+ bit2 = (color_prom[i] >> 6) & 0x01;
+ bit3 = (color_prom[i] >> 7) & 0x01;
+ r = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3;
+ /* green component */
+ bit0 = (color_prom[i] >> 0) & 0x01;
+ bit1 = (color_prom[i] >> 1) & 0x01;
+ bit2 = (color_prom[i] >> 2) & 0x01;
+ bit3 = (color_prom[i] >> 3) & 0x01;
+ g = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3;
+ /* blue component */
+ bit0 = (color_prom[i + machine->drv->total_colors] >> 0) & 0x01;
+ bit1 = (color_prom[i + machine->drv->total_colors] >> 1) & 0x01;
+ bit2 = (color_prom[i + machine->drv->total_colors] >> 2) & 0x01;
+ bit3 = (color_prom[i + machine->drv->total_colors] >> 3) & 0x01;
+ b = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3;
+
+ palette_set_color(machine,i,MAKE_RGB(r,g,b));
+ }
+}
+
+
+
+/***************************************************************************
+
+ Callbacks for the TileMap code
+
+***************************************************************************/
+
+static TILE_GET_INFO( get_tile_info )
+{
+ UINT8 attr = colorram[tile_index];
+ SET_TILE_INFO(
+ 0,
+ videoram[tile_index] + ((attr & 0x07) << 8),
+ ((attr & 0x10) >> 3) | ((attr & 0x20) >> 5),
+ TILE_FLIPX);
+ tileinfo->group = (attr & 0x80) >> 7;
+}
+
+
+
+/***************************************************************************
+
+ Start the video hardware emulation.
+
+***************************************************************************/
+
+VIDEO_START( sidepckt )
+{
+ bg_tilemap = tilemap_create(get_tile_info,tilemap_scan_rows,TILEMAP_TYPE_PEN,8,8,32,32);
+
+ tilemap_set_transmask(bg_tilemap,0,0xff,0x00); /* split type 0 is totally transparent in front half */
+ tilemap_set_transmask(bg_tilemap,1,0x01,0xfe); /* split type 1 has pen 0 transparent in front half */
+
+ tilemap_set_flip(ALL_TILEMAPS,TILEMAP_FLIPX);
+}
+
+
+
+/***************************************************************************
+
+ Memory handlers
+
+***************************************************************************/
+
+WRITE8_HANDLER( sidepckt_videoram_w )
+{
+ videoram[offset] = data;
+ tilemap_mark_tile_dirty(bg_tilemap,offset);
+}
+
+WRITE8_HANDLER( sidepckt_colorram_w )
+{
+ colorram[offset] = data;
+ tilemap_mark_tile_dirty(bg_tilemap,offset);
+}
+
+WRITE8_HANDLER( sidepckt_flipscreen_w )
+{
+ flipscreen = data;
+ tilemap_set_flip(ALL_TILEMAPS,flipscreen ? TILEMAP_FLIPY : TILEMAP_FLIPX);
+}
+
+
+/***************************************************************************
+
+ Display refresh
+
+***************************************************************************/
+
+static void draw_sprites(running_machine *machine, mame_bitmap *bitmap,const rectangle *cliprect)
+{
+ int offs;
+
+ for (offs = 0;offs < spriteram_size; offs += 4)
+ {
+ int sx,sy,code,color,flipx,flipy;
+
+ code = spriteram[offs+3] + ((spriteram[offs+1] & 0x03) << 8);
+ color = (spriteram[offs+1] & 0xf0) >> 4;
+
+ sx = spriteram[offs+2]-2;
+ sy = spriteram[offs];
+
+ flipx = spriteram[offs+1] & 0x08;
+ flipy = spriteram[offs+1] & 0x04;
+
+ drawgfx(bitmap,machine->gfx[1],
+ code,
+ color,
+ flipx,flipy,
+ sx,sy,
+ cliprect,TRANSPARENCY_PEN,0);
+ /* wraparound */
+ drawgfx(bitmap,machine->gfx[1],
+ code,
+ color,
+ flipx,flipy,
+ sx-256,sy,
+ cliprect,TRANSPARENCY_PEN,0);
+ }
+}
+
+
+VIDEO_UPDATE( sidepckt )
+{
+ tilemap_draw(bitmap,cliprect,bg_tilemap,TILEMAP_DRAW_LAYER1,0);
+ draw_sprites(machine, bitmap,cliprect);
+ tilemap_draw(bitmap,cliprect,bg_tilemap,TILEMAP_DRAW_LAYER0,0);
+ return 0;
+}