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Diffstat (limited to 'src/mame/video/mrjong.c')
-rw-r--r--src/mame/video/mrjong.c139
1 files changed, 139 insertions, 0 deletions
diff --git a/src/mame/video/mrjong.c b/src/mame/video/mrjong.c
new file mode 100644
index 00000000000..51dd6ac88fb
--- /dev/null
+++ b/src/mame/video/mrjong.c
@@ -0,0 +1,139 @@
+/***************************************************************************
+
+ video.c
+
+ Functions to emulate the video hardware of the machine.
+
+***************************************************************************/
+
+#include "driver.h"
+
+static tilemap *bg_tilemap;
+
+/***************************************************************************
+
+ Convert the color PROMs. (from video/penco.c)
+
+***************************************************************************/
+PALETTE_INIT( mrjong )
+{
+ int i;
+ #define TOTAL_COLORS(gfxn) (machine->gfx[gfxn]->total_colors * machine->gfx[gfxn]->color_granularity)
+ #define COLOR(gfxn, offs) (colortable[machine->drv->gfxdecodeinfo[gfxn].color_codes_start + (offs)])
+
+ for (i = 0; i < machine->drv->total_colors; i++)
+ {
+ int bit0, bit1, bit2, r, g, b;
+
+ /* red component */
+ bit0 = (*color_prom >> 0) & 0x01;
+ bit1 = (*color_prom >> 1) & 0x01;
+ bit2 = (*color_prom >> 2) & 0x01;
+ r = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
+ /* green component */
+ bit0 = (*color_prom >> 3) & 0x01;
+ bit1 = (*color_prom >> 4) & 0x01;
+ bit2 = (*color_prom >> 5) & 0x01;
+ g = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
+ /* blue component */
+ bit0 = 0;
+ bit1 = (*color_prom >> 6) & 0x01;
+ bit2 = (*color_prom >> 7) & 0x01;
+ b = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
+
+ palette_set_color(machine,i,MAKE_RGB(r,g,b));
+ color_prom++;
+ }
+
+ color_prom += 0x10;
+ /* color_prom now points to the beginning of the lookup table */
+
+ /* character lookup table */
+ /* sprites use the same color lookup table as characters */
+ for (i = 0; i < TOTAL_COLORS(0); i++)
+ COLOR(0, i) = *(color_prom++) & 0x0f;
+}
+
+
+/***************************************************************************
+
+ Display control parameter.
+
+***************************************************************************/
+WRITE8_HANDLER( mrjong_videoram_w )
+{
+ videoram[offset] = data;
+ tilemap_mark_tile_dirty(bg_tilemap, offset);
+}
+
+WRITE8_HANDLER( mrjong_colorram_w )
+{
+ colorram[offset] = data;
+ tilemap_mark_tile_dirty(bg_tilemap, offset);
+}
+
+WRITE8_HANDLER( mrjong_flipscreen_w )
+{
+ if (flip_screen != (data & 0x01))
+ {
+ flip_screen_set(data & 0x01);
+ tilemap_mark_all_tiles_dirty(ALL_TILEMAPS);
+ }
+}
+
+static TILE_GET_INFO( get_bg_tile_info )
+{
+ int code = videoram[tile_index] | ((colorram[tile_index] & 0x20) << 3);
+ int color = colorram[tile_index] & 0x1f;
+ int flags = ((colorram[tile_index] & 0x40) ? TILE_FLIPX : 0) | ((colorram[tile_index] & 0x80) ? TILE_FLIPY : 0);
+
+ SET_TILE_INFO(0, code, color, flags);
+}
+
+VIDEO_START( mrjong )
+{
+ bg_tilemap = tilemap_create(get_bg_tile_info, tilemap_scan_rows_flip_xy,
+ TILEMAP_TYPE_PEN, 8, 8, 32, 32);
+}
+
+static void draw_sprites(running_machine *machine, mame_bitmap *bitmap, const rectangle *cliprect)
+{
+ int offs;
+
+ for (offs = (spriteram_size - 4); offs >= 0; offs -= 4)
+ {
+ int sprt;
+ int color;
+ int sx, sy;
+ int flipx, flipy;
+
+ sprt = (((spriteram[offs + 1] >> 2) & 0x3f) | ((spriteram[offs + 3] & 0x20) << 1));
+ flipx = (spriteram[offs + 1] & 0x01) >> 0;
+ flipy = (spriteram[offs + 1] & 0x02) >> 1;
+ color = (spriteram[offs + 3] & 0x1f);
+
+ sx = 224 - spriteram[offs + 2];
+ sy = spriteram[offs + 0];
+ if (flip_screen)
+ {
+ sx = 208 - sx;
+ sy = 240 - sy;
+ flipx = !flipx;
+ flipy = !flipy;
+ }
+
+ drawgfx(bitmap, machine->gfx[1],
+ sprt,
+ color,
+ flipx, flipy,
+ sx, sy,
+ cliprect, TRANSPARENCY_PEN, 0);
+ }
+}
+
+VIDEO_UPDATE( mrjong )
+{
+ tilemap_draw(bitmap, cliprect, bg_tilemap, 0, 0);
+ draw_sprites(machine, bitmap, cliprect);
+ return 0;
+}