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Diffstat (limited to 'src/mame/video/exprraid.c')
-rw-r--r--src/mame/video/exprraid.c143
1 files changed, 143 insertions, 0 deletions
diff --git a/src/mame/video/exprraid.c b/src/mame/video/exprraid.c
new file mode 100644
index 00000000000..fb9a089e545
--- /dev/null
+++ b/src/mame/video/exprraid.c
@@ -0,0 +1,143 @@
+#include "driver.h"
+
+static int bg_index[4];
+
+static tilemap *bg_tilemap, *fg_tilemap;
+
+WRITE8_HANDLER( exprraid_videoram_w )
+{
+ videoram[offset] = data;
+ tilemap_mark_tile_dirty(fg_tilemap, offset);
+}
+
+WRITE8_HANDLER( exprraid_colorram_w )
+{
+ colorram[offset] = data;
+ tilemap_mark_tile_dirty(fg_tilemap, offset);
+}
+
+WRITE8_HANDLER( exprraid_flipscreen_w )
+{
+ if (flip_screen != (data & 0x01))
+ {
+ flip_screen_set(data & 0x01);
+ tilemap_mark_all_tiles_dirty(ALL_TILEMAPS);
+ }
+}
+
+WRITE8_HANDLER( exprraid_bgselect_w )
+{
+ if (bg_index[offset] != data)
+ {
+ bg_index[offset] = data;
+ tilemap_mark_all_tiles_dirty(bg_tilemap);
+ }
+}
+
+WRITE8_HANDLER( exprraid_scrollx_w )
+{
+ tilemap_set_scrollx(bg_tilemap, offset, data);
+}
+
+WRITE8_HANDLER( exprraid_scrolly_w )
+{
+ tilemap_set_scrolly(bg_tilemap, 0, data);
+}
+
+static TILE_GET_INFO( get_bg_tile_info )
+{
+ UINT8 *tilerom = memory_region(REGION_GFX4);
+
+ int data, attr, bank, code, color, flags;
+ int quadrant = 0, offs;
+
+ int sx = tile_index % 32;
+ int sy = tile_index / 32;
+
+ if (sx >= 16) quadrant++;
+ if (sy >= 16) quadrant += 2;
+
+ offs = (sy % 16) * 16 + (sx % 16) + (bg_index[quadrant] & 0x3f) * 0x100;
+
+ data = tilerom[offs];
+ attr = tilerom[offs + 0x4000];
+ bank = (2 * (attr & 0x03) + ((data & 0x80) >> 7)) + 2;
+ code = data & 0x7f;
+ color = (attr & 0x18) >> 3;
+ flags = (attr & 0x04) ? TILE_FLIPX : 0;
+
+ tileinfo->category = ((attr & 0x80) ? 1 : 0);
+
+ SET_TILE_INFO(bank, code, color, flags);
+}
+
+static TILE_GET_INFO( get_fg_tile_info )
+{
+ int attr = colorram[tile_index];
+ int code = videoram[tile_index] + ((attr & 0x07) << 8);
+ int color = (attr & 0x10) >> 4;
+
+ SET_TILE_INFO(0, code, color, 0);
+}
+
+VIDEO_START( exprraid )
+{
+ bg_tilemap = tilemap_create(get_bg_tile_info, tilemap_scan_rows,
+ TILEMAP_TYPE_PEN, 16, 16, 32, 32);
+
+ fg_tilemap = tilemap_create(get_fg_tile_info, tilemap_scan_rows,
+ TILEMAP_TYPE_PEN, 8, 8, 32, 32);
+
+ tilemap_set_scroll_rows(bg_tilemap, 2);
+ tilemap_set_transparent_pen(fg_tilemap, 0);
+}
+
+static void draw_sprites(running_machine *machine, mame_bitmap *bitmap, const rectangle *cliprect)
+{
+ int offs;
+
+ for (offs = 0;offs < spriteram_size;offs += 4)
+ {
+ int attr = spriteram[offs + 1];
+ int code = spriteram[offs + 3] + ((attr & 0xe0) << 3);
+ int color = (attr & 0x03) + ((attr & 0x08) >> 1);
+ int flipx = (attr & 0x04);
+ int flipy = 0;
+ int sx = ((248 - spriteram[offs + 2]) & 0xff) - 8;
+ int sy = spriteram[offs];
+
+ if (flip_screen)
+ {
+ sx = 240 - sx;
+ sy = 240 - sy;
+ flipx = !flipx;
+ flipy = !flipy;
+ }
+
+ drawgfx(bitmap, machine->gfx[1],
+ code, color,
+ flipx, flipy,
+ sx, sy,
+ 0, TRANSPARENCY_PEN, 0);
+
+ /* double height */
+
+ if (attr & 0x10)
+ {
+ drawgfx(bitmap,machine->gfx[1],
+ code + 1, color,
+ flipx, flipy,
+ sx, sy + (flip_screen ? -16 : 16),
+ cliprect, TRANSPARENCY_PEN, 0);
+ }
+ }
+}
+
+VIDEO_UPDATE( exprraid )
+{
+ tilemap_draw(bitmap, cliprect, bg_tilemap, 0, 0);
+ draw_sprites(machine, bitmap, cliprect);
+ tilemap_draw(bitmap, cliprect, bg_tilemap, 1, 0);
+ tilemap_draw(bitmap, cliprect, fg_tilemap, 0, 0);
+ return 0;
+}