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Diffstat (limited to 'src/mame/video/holeland.c')
-rw-r--r--src/mame/video/holeland.c196
1 files changed, 196 insertions, 0 deletions
diff --git a/src/mame/video/holeland.c b/src/mame/video/holeland.c
new file mode 100644
index 00000000000..89f595cfd75
--- /dev/null
+++ b/src/mame/video/holeland.c
@@ -0,0 +1,196 @@
+/***************************************************************************
+
+ video.c
+
+ Functions to emulate the video hardware of the machine.
+
+***************************************************************************/
+
+#include "driver.h"
+
+static int palette_offset;
+static tilemap *bg_tilemap;
+
+
+/***************************************************************************
+
+ Callbacks for the TileMap code
+
+***************************************************************************/
+
+static TILE_GET_INFO( holeland_get_tile_info )
+{
+ int attr = colorram[tile_index];
+ int tile_number = videoram[tile_index] | ((attr & 0x03) << 8);
+
+/*if (input_code_pressed(KEYCODE_Q) && (attr & 0x10)) tile_number = rand(); */
+/*if (input_code_pressed(KEYCODE_W) && (attr & 0x20)) tile_number = rand(); */
+/*if (input_code_pressed(KEYCODE_E) && (attr & 0x40)) tile_number = rand(); */
+/*if (input_code_pressed(KEYCODE_R) && (attr & 0x80)) tile_number = rand(); */
+ SET_TILE_INFO(
+ 0,
+ tile_number,
+ palette_offset + ((attr >> 4) & 0x0f),
+ TILE_FLIPYX((attr >> 2) & 0x03));
+ tileinfo->group = (attr >> 4) & 1;
+}
+
+static TILE_GET_INFO( crzrally_get_tile_info )
+{
+ int attr = colorram[tile_index];
+ int tile_number = videoram[tile_index] | ((attr & 0x03) << 8);
+
+ SET_TILE_INFO(
+ 0,
+ tile_number,
+ palette_offset + ((attr >> 4) & 0x0f),
+ TILE_FLIPYX((attr >> 2) & 0x03));
+ tileinfo->group = (attr >> 4) & 1;
+}
+
+/***************************************************************************
+
+ Start the video hardware emulation.
+
+***************************************************************************/
+
+VIDEO_START( holeland )
+{
+ bg_tilemap = tilemap_create(holeland_get_tile_info,tilemap_scan_rows,TILEMAP_TYPE_PEN,16,16,32,32);
+
+ 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 */
+}
+
+VIDEO_START( crzrally )
+{
+ bg_tilemap = tilemap_create(crzrally_get_tile_info,tilemap_scan_cols,TILEMAP_TYPE_PEN,8,8,32,32);
+}
+
+WRITE8_HANDLER( holeland_videoram_w )
+{
+ videoram[offset] = data;
+ tilemap_mark_tile_dirty( bg_tilemap, offset );
+}
+
+WRITE8_HANDLER( holeland_colorram_w )
+{
+ colorram[offset] = data;
+ tilemap_mark_tile_dirty( bg_tilemap, offset );
+}
+
+WRITE8_HANDLER( holeland_pal_offs_w )
+{
+ static int po[2];
+ if ((data & 1) != po[offset])
+ {
+ po[offset] = data & 1;
+ palette_offset = (po[0] + (po[1] << 1)) << 4;
+ tilemap_mark_all_tiles_dirty(ALL_TILEMAPS);
+ }
+}
+
+WRITE8_HANDLER( holeland_scroll_w )
+{
+ tilemap_set_scrollx(bg_tilemap, 0, data);
+}
+
+WRITE8_HANDLER( holeland_flipscreen_w )
+{
+ if (offset) flip_screen_y_set(data);
+ else flip_screen_x_set(data);
+}
+
+
+static void holeland_draw_sprites(running_machine *machine, mame_bitmap *bitmap,const rectangle *cliprect)
+{
+ int offs,code,sx,sy,color,flipx, flipy;
+
+ /* Weird, sprites entries don't start on DWORD boundary */
+ for (offs = 3;offs < spriteram_size - 1;offs += 4)
+ {
+ sy = 236 - spriteram[offs];
+ sx = spriteram[offs+2];
+
+ /* Bit 7 unknown */
+ code = spriteram[offs+1] & 0x7f;
+ color = palette_offset + (spriteram[offs+3] >> 4);
+
+ /* Bit 0, 1 unknown */
+ flipx = spriteram[offs+3] & 0x04;
+ flipy = spriteram[offs+3] & 0x08;
+
+ if (flip_screen_x)
+ {
+ flipx = !flipx;
+ sx = 240 - sx;
+ }
+
+ if (flip_screen_y)
+ {
+ flipy = !flipy;
+ sy = 240 - sy;
+ }
+
+ drawgfx(bitmap,machine->gfx[1],
+ code,
+ color,
+ flipx,flipy,
+ 2*sx,2*sy,
+ cliprect,TRANSPARENCY_PEN,0);
+ }
+}
+
+static void crzrally_draw_sprites(running_machine *machine, mame_bitmap *bitmap,const rectangle *cliprect)
+{
+ int offs,code,sx,sy,color,flipx, flipy;
+
+ /* Weird, sprites entries don't start on DWORD boundary */
+ for (offs = 3;offs < spriteram_size - 1;offs += 4)
+ {
+ sy = 236 - spriteram[offs];
+ sx = spriteram[offs+2];
+
+ code = spriteram[offs+1] + ((spriteram[offs+3] & 0x01) << 8);
+ color = (spriteram[offs+3] >> 4) + ((spriteram[offs+3] & 0x01) << 4);
+
+ /* Bit 1 unknown */
+ flipx = spriteram[offs+3] & 0x04;
+ flipy = spriteram[offs+3] & 0x08;
+
+ if (flip_screen_x)
+ {
+ flipx = !flipx;
+ sx = 240 - sx;
+ }
+
+ if (flip_screen_y)
+ {
+ flipy = !flipy;
+ sy = 240 - sy;
+ }
+
+ drawgfx(bitmap,machine->gfx[1],
+ code,
+ color,
+ flipx,flipy,
+ sx,sy,
+ cliprect,TRANSPARENCY_PEN,0);
+ }
+}
+
+VIDEO_UPDATE( holeland )
+{
+/*tilemap_mark_all_tiles_dirty(bg_tilemap); */
+ tilemap_draw(bitmap,cliprect,bg_tilemap,TILEMAP_DRAW_LAYER1,0);
+ holeland_draw_sprites(machine, bitmap,cliprect);
+ tilemap_draw(bitmap,cliprect,bg_tilemap,TILEMAP_DRAW_LAYER0,0);
+ return 0;
+}
+
+VIDEO_UPDATE( crzrally )
+{
+ tilemap_draw(bitmap,cliprect,bg_tilemap,0,0);
+ crzrally_draw_sprites(machine, bitmap,cliprect);
+ return 0;
+}