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Diffstat (limited to 'src/mame/video/commando.c')
-rw-r--r--src/mame/video/commando.c140
1 files changed, 140 insertions, 0 deletions
diff --git a/src/mame/video/commando.c b/src/mame/video/commando.c
new file mode 100644
index 00000000000..16c5a533aec
--- /dev/null
+++ b/src/mame/video/commando.c
@@ -0,0 +1,140 @@
+/***************************************************************************
+
+ video.c
+
+ Functions to emulate the video hardware of the machine.
+
+***************************************************************************/
+
+#include "driver.h"
+
+UINT8 *commando_videoram2, *commando_colorram2;
+
+static tilemap *bg_tilemap, *fg_tilemap;
+
+WRITE8_HANDLER( commando_videoram_w )
+{
+ videoram[offset] = data;
+ tilemap_mark_tile_dirty(bg_tilemap, offset);
+}
+
+WRITE8_HANDLER( commando_colorram_w )
+{
+ colorram[offset] = data;
+ tilemap_mark_tile_dirty(bg_tilemap, offset);
+}
+
+WRITE8_HANDLER( commando_videoram2_w )
+{
+ commando_videoram2[offset] = data;
+ tilemap_mark_tile_dirty(fg_tilemap, offset);
+}
+
+WRITE8_HANDLER( commando_colorram2_w )
+{
+ commando_colorram2[offset] = data;
+ tilemap_mark_tile_dirty(fg_tilemap, offset);
+}
+
+WRITE8_HANDLER( commando_scrollx_w )
+{
+ static UINT8 scroll[2];
+
+ scroll[offset] = data;
+ tilemap_set_scrollx(bg_tilemap,0,scroll[0] | (scroll[1] << 8));
+}
+
+WRITE8_HANDLER( commando_scrolly_w )
+{
+ static UINT8 scroll[2];
+
+ scroll[offset] = data;
+ tilemap_set_scrolly(bg_tilemap,0,scroll[0] | (scroll[1] << 8));
+}
+
+WRITE8_HANDLER( commando_c804_w )
+{
+ // bits 0 and 1 are coin counters
+ coin_counter_w(0, data & 0x01);
+ coin_counter_w(1, data & 0x02);
+
+ // bit 4 resets the sound CPU
+ cpunum_set_input_line(1, INPUT_LINE_RESET, (data & 0x10) ? ASSERT_LINE : CLEAR_LINE);
+
+ // bit 7 flips screen
+ flip_screen_set(data & 0x80);
+}
+
+static TILE_GET_INFO( get_bg_tile_info )
+{
+ int attr = colorram[tile_index];
+ int code = videoram[tile_index] + ((attr & 0xc0) << 2);
+ int color = attr & 0x0f;
+ int flags = TILE_FLIPYX((attr & 0x30) >> 4);
+
+ SET_TILE_INFO(1, code, color, flags);
+}
+
+static TILE_GET_INFO( get_fg_tile_info )
+{
+ int attr = commando_colorram2[tile_index];
+ int code = commando_videoram2[tile_index] + ((attr & 0xc0) << 2);
+ int color = attr & 0x0f;
+ int flags = TILE_FLIPYX((attr & 0x30) >> 4);
+
+ SET_TILE_INFO(0, code, color, flags);
+}
+
+VIDEO_START( commando )
+{
+ bg_tilemap = tilemap_create(get_bg_tile_info, tilemap_scan_cols,
+ 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_transparent_pen(fg_tilemap, 3);
+}
+
+static void draw_sprites(running_machine *machine, mame_bitmap *bitmap, const rectangle *cliprect)
+{
+ int offs;
+
+ for (offs = spriteram_size - 4; offs >= 0; offs -= 4)
+ {
+ // bit 1 of attr is not used
+ int attr = buffered_spriteram[offs + 1];
+ int bank = (attr & 0xc0) >> 6;
+ int code = buffered_spriteram[offs] + 256 * bank;
+ int color = (attr & 0x30) >> 4;
+ int flipx = attr & 0x04;
+ int flipy = attr & 0x08;
+ int sx = buffered_spriteram[offs + 3] - ((attr & 0x01) << 8);
+ int sy = buffered_spriteram[offs + 2];
+
+ if (flip_screen)
+ {
+ sx = 240 - sx;
+ sy = 240 - sy;
+ flipx = !flipx;
+ flipy = !flipy;
+ }
+
+ if (bank < 3)
+ drawgfx(bitmap,machine->gfx[2], code, color, flipx, flipy, sx, sy,
+ cliprect, TRANSPARENCY_PEN, 15);
+ }
+}
+
+VIDEO_UPDATE( commando )
+{
+ tilemap_draw(bitmap, cliprect, bg_tilemap, 0, 0);
+ draw_sprites(machine, bitmap, cliprect);
+ tilemap_draw(bitmap, cliprect, fg_tilemap, 0, 0);
+ return 0;
+}
+
+VIDEO_EOF( commando )
+{
+ buffer_spriteram_w(0, 0);
+}