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Diffstat (limited to 'src/mame/video/arkanoid.c')
-rw-r--r--src/mame/video/arkanoid.c120
1 files changed, 120 insertions, 0 deletions
diff --git a/src/mame/video/arkanoid.c b/src/mame/video/arkanoid.c
new file mode 100644
index 00000000000..826efe6953a
--- /dev/null
+++ b/src/mame/video/arkanoid.c
@@ -0,0 +1,120 @@
+/***************************************************************************
+
+ video.c
+
+ Functions to emulate the video hardware of the machine.
+
+***************************************************************************/
+
+#include "driver.h"
+#include "includes/arkanoid.h"
+
+static UINT8 gfxbank, palettebank;
+extern UINT8 arkanoid_paddle_select;
+
+static tilemap *bg_tilemap;
+
+WRITE8_HANDLER( arkanoid_videoram_w )
+{
+ videoram[offset] = data;
+ tilemap_mark_tile_dirty(bg_tilemap, offset / 2);
+}
+
+WRITE8_HANDLER( arkanoid_d008_w )
+{
+ int bank;
+
+ /* bits 0 and 1 flip X and Y, I don't know which is which */
+ if (flip_screen_x != (data & 0x01)) {
+ flip_screen_x_set(data & 0x01);
+ tilemap_mark_all_tiles_dirty(bg_tilemap);
+ }
+
+ if (flip_screen_y != (data & 0x02)) {
+ flip_screen_y_set(data & 0x02);
+ tilemap_mark_all_tiles_dirty(bg_tilemap);
+ }
+
+ /* bit 2 selects the input paddle */
+ arkanoid_paddle_select = data & 0x04;
+
+ /* bit 3 is coin lockout (but not the service coin) */
+ coin_lockout_w(0, !(data & 0x08));
+ coin_lockout_w(1, !(data & 0x08));
+
+ /* bit 4 is unknown */
+
+ /* bits 5 and 6 control gfx bank and palette bank. They are used together */
+ /* so I don't know which is which. */
+ bank = (data & 0x20) >> 5;
+
+ if (gfxbank != bank) {
+ gfxbank = bank;
+ tilemap_mark_all_tiles_dirty(bg_tilemap);
+ }
+
+ bank = (data & 0x40) >> 6;
+
+ if (palettebank != bank) {
+ palettebank = bank;
+ tilemap_mark_all_tiles_dirty(bg_tilemap);
+ }
+
+ /* bit 7 is unknown */
+}
+
+static TILE_GET_INFO( get_bg_tile_info )
+{
+ int offs = tile_index * 2;
+ int code = videoram[offs + 1] + ((videoram[offs] & 0x07) << 8) + 2048 * gfxbank;
+ int color = ((videoram[offs] & 0xf8) >> 3) + 32 * palettebank;
+
+ SET_TILE_INFO(0, code, color, 0);
+}
+
+VIDEO_START( arkanoid )
+{
+ bg_tilemap = tilemap_create(get_bg_tile_info, tilemap_scan_rows,
+ TILEMAP_TYPE_PEN, 8, 8, 32, 32);
+
+ state_save_register_global(gfxbank);
+ state_save_register_global(palettebank);
+}
+
+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;
+
+ sx = spriteram[offs];
+ sy = 248 - spriteram[offs + 1];
+ if (flip_screen_x) sx = 248 - sx;
+ if (flip_screen_y) sy = 248 - sy;
+
+ code = spriteram[offs + 3] + ((spriteram[offs + 2] & 0x03) << 8) + 1024 * gfxbank;
+
+ drawgfx(bitmap,machine->gfx[0],
+ 2 * code,
+ ((spriteram[offs + 2] & 0xf8) >> 3) + 32 * palettebank,
+ flip_screen_x,flip_screen_y,
+ sx,sy + (flip_screen_y ? 8 : -8),
+ cliprect,TRANSPARENCY_PEN,0);
+ drawgfx(bitmap,machine->gfx[0],
+ 2 * code + 1,
+ ((spriteram[offs + 2] & 0xf8) >> 3) + 32 * palettebank,
+ flip_screen_x,flip_screen_y,
+ sx,sy,
+ cliprect,TRANSPARENCY_PEN,0);
+ }
+}
+
+
+VIDEO_UPDATE( arkanoid )
+{
+ tilemap_draw(bitmap, cliprect, bg_tilemap, 0, 0);
+ draw_sprites(machine, bitmap, cliprect);
+ return 0;
+}