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-rw-r--r--src/mame/video/exedexes.c254
1 files changed, 254 insertions, 0 deletions
diff --git a/src/mame/video/exedexes.c b/src/mame/video/exedexes.c
new file mode 100644
index 00000000000..a193b33b554
--- /dev/null
+++ b/src/mame/video/exedexes.c
@@ -0,0 +1,254 @@
+/***************************************************************************
+
+ video.c
+
+ Functions to emulate the video hardware of the machine.
+
+***************************************************************************/
+
+#include "driver.h"
+
+UINT8 *exedexes_bg_scroll;
+
+UINT8 *exedexes_nbg_yscroll;
+UINT8 *exedexes_nbg_xscroll;
+
+static int chon,objon,sc1on,sc2on;
+
+#define TileMap(offs) (memory_region(REGION_GFX5)[offs])
+#define BackTileMap(offs) (memory_region(REGION_GFX5)[offs+0x4000])
+
+static tilemap *bg_tilemap, *fg_tilemap, *tx_tilemap;
+
+/***************************************************************************
+
+ Convert the color PROMs into a more useable format.
+
+ Exed Exes has three 256x4 palette PROMs (one per gun), three 256x4 lookup
+ table PROMs (one for characters, one for sprites, one for background tiles)
+ and one 256x4 sprite palette bank selector PROM.
+
+ The palette PROMs are connected to the RGB output this way:
+
+ bit 3 -- 220 ohm resistor -- RED/GREEN/BLUE
+ -- 470 ohm resistor -- RED/GREEN/BLUE
+ -- 1 kohm resistor -- RED/GREEN/BLUE
+ bit 0 -- 2.2kohm resistor -- RED/GREEN/BLUE
+
+***************************************************************************/
+PALETTE_INIT( exedexes )
+{
+ 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,bit3,r,g,b;
+
+
+ bit0 = (color_prom[0] >> 0) & 0x01;
+ bit1 = (color_prom[0] >> 1) & 0x01;
+ bit2 = (color_prom[0] >> 2) & 0x01;
+ bit3 = (color_prom[0] >> 3) & 0x01;
+ r = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3;
+ bit0 = (color_prom[machine->drv->total_colors] >> 0) & 0x01;
+ bit1 = (color_prom[machine->drv->total_colors] >> 1) & 0x01;
+ bit2 = (color_prom[machine->drv->total_colors] >> 2) & 0x01;
+ bit3 = (color_prom[machine->drv->total_colors] >> 3) & 0x01;
+ g = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3;
+ bit0 = (color_prom[2*machine->drv->total_colors] >> 0) & 0x01;
+ bit1 = (color_prom[2*machine->drv->total_colors] >> 1) & 0x01;
+ bit2 = (color_prom[2*machine->drv->total_colors] >> 2) & 0x01;
+ bit3 = (color_prom[2*machine->drv->total_colors] >> 3) & 0x01;
+ b = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3;
+
+ palette_set_color(machine,i,MAKE_RGB(r,g,b));
+ color_prom++;
+ }
+
+ color_prom += 2*machine->drv->total_colors;
+ /* color_prom now points to the beginning of the lookup table */
+
+ /* characters use colors 192-207 */
+ for (i = 0;i < TOTAL_COLORS(0);i++)
+ COLOR(0,i) = (*color_prom++) + 192;
+
+ /* 32x32 tiles use colors 0-15 */
+ for (i = 0;i < TOTAL_COLORS(1);i++)
+ COLOR(1,i) = (*color_prom++);
+
+ /* 16x16 tiles use colors 64-79 */
+ for (i = 0;i < TOTAL_COLORS(2);i++)
+ COLOR(2,i) = (*color_prom++) + 64;
+
+ /* sprites use colors 128-191 in four banks */
+ for (i = 0;i < TOTAL_COLORS(3);i++)
+ {
+ COLOR(3,i) = color_prom[0] + 128 + 16 * color_prom[256];
+ color_prom++;
+ }
+}
+
+WRITE8_HANDLER( exedexes_videoram_w )
+{
+ videoram[offset] = data;
+ tilemap_mark_tile_dirty(tx_tilemap, offset);
+}
+
+WRITE8_HANDLER( exedexes_colorram_w )
+{
+ colorram[offset] = data;
+ tilemap_mark_tile_dirty(tx_tilemap, offset);
+}
+
+WRITE8_HANDLER( exedexes_c804_w )
+{
+ /* bits 0 and 1 are coin counters */
+ coin_counter_w(0, data & 0x01);
+ coin_counter_w(1, data & 0x02);
+
+ coin_lockout_w(0, data & 0x04);
+ coin_lockout_w(1, data & 0x08);
+
+ /* bit 7 is text enable */
+ chon = data & 0x80;
+
+ /* other bits seem to be unused */
+}
+
+WRITE8_HANDLER( exedexes_gfxctrl_w )
+{
+ /* bit 4 is bg enable */
+ sc2on = data & 0x10;
+
+ /* bit 5 is fg enable */
+ sc1on = data & 0x20;
+
+ /* bit 6 is sprite enable */
+ objon = data & 0x40;
+
+ /* other bits seem to be unused */
+}
+
+
+static TILE_GET_INFO( get_bg_tile_info )
+{
+ UINT8 *tilerom = memory_region(REGION_GFX5);
+
+ int attr = tilerom[tile_index];
+ int code = attr & 0x3f;
+ int color = tilerom[tile_index + (8 * 8)];
+ int flags = ((attr & 0x40) ? TILE_FLIPX : 0) | ((attr & 0x80) ? TILE_FLIPY : 0);
+
+ SET_TILE_INFO(1, code, color, flags);
+}
+
+static TILE_GET_INFO( get_fg_tile_info )
+{
+ int code = memory_region(REGION_GFX5)[tile_index];
+
+ SET_TILE_INFO(2, code, 0, 0);
+}
+
+static TILE_GET_INFO( get_tx_tile_info )
+{
+ int code = videoram[tile_index] + 2 * (colorram[tile_index] & 0x80);
+ int color = colorram[tile_index] & 0x3f;
+
+ SET_TILE_INFO(0, code, color, 0);
+}
+
+static TILEMAP_MAPPER( exedexes_bg_tilemap_scan )
+{
+ /* logical (col,row) -> memory offset */
+ return ((col * 32 & 0xe0) >> 5) + ((row * 32 & 0xe0) >> 2) + ((col * 32 & 0x3f00) >> 1) + 0x4000;
+}
+
+static TILEMAP_MAPPER( exedexes_fg_tilemap_scan )
+{
+ /* logical (col,row) -> memory offset */
+ return ((col * 16 & 0xf0) >> 4) + (row * 16 & 0xf0) + (col * 16 & 0x700) + ((row * 16 & 0x700) << 3);
+}
+
+VIDEO_START( exedexes )
+{
+ bg_tilemap = tilemap_create(get_bg_tile_info, exedexes_bg_tilemap_scan,
+ TILEMAP_TYPE_PEN, 32, 32, 64, 64);
+
+ fg_tilemap = tilemap_create(get_fg_tile_info, exedexes_fg_tilemap_scan,
+ TILEMAP_TYPE_PEN, 16, 16, 128, 128);
+
+ tx_tilemap = tilemap_create(get_tx_tile_info, tilemap_scan_rows,
+ TILEMAP_TYPE_COLORTABLE, 8, 8, 32, 32);
+
+ tilemap_set_transparent_pen(fg_tilemap, 0);
+ tilemap_set_transparent_pen(tx_tilemap, 207);
+}
+
+static void draw_sprites(running_machine *machine, mame_bitmap *bitmap, const rectangle *cliprect, int priority)
+{
+ int offs;
+
+ if (!objon) return;
+
+ priority = priority ? 0x40 : 0x00;
+
+ for (offs = spriteram_size - 32;offs >= 0;offs -= 32)
+ {
+ if ((buffered_spriteram[offs + 1] & 0x40) == priority)
+ {
+ int code,color,flipx,flipy,sx,sy;
+
+ code = buffered_spriteram[offs];
+ color = buffered_spriteram[offs + 1] & 0x0f;
+ flipx = buffered_spriteram[offs + 1] & 0x10;
+ flipy = buffered_spriteram[offs + 1] & 0x20;
+ sx = buffered_spriteram[offs + 3] - ((buffered_spriteram[offs + 1] & 0x80) << 1);
+ sy = buffered_spriteram[offs + 2];
+
+ drawgfx(bitmap,machine->gfx[3],
+ code,
+ color,
+ flipx,flipy,
+ sx,sy,
+ cliprect,TRANSPARENCY_PEN,0);
+ }
+ }
+}
+
+VIDEO_UPDATE( exedexes )
+{
+ if (sc2on)
+ {
+ tilemap_set_scrollx(bg_tilemap, 0, ((exedexes_bg_scroll[1]) << 8) + exedexes_bg_scroll[0]);
+ tilemap_draw(bitmap, cliprect, bg_tilemap, 0, 0);
+ }
+ else
+ {
+ fillbitmap(bitmap, machine->pens[0], cliprect);
+ }
+
+ draw_sprites(machine, bitmap, cliprect, 1);
+
+ if (sc1on)
+ {
+ tilemap_set_scrollx(fg_tilemap, 0, ((exedexes_nbg_yscroll[1]) << 8) + exedexes_nbg_yscroll[0]);
+ tilemap_set_scrolly(fg_tilemap, 0, ((exedexes_nbg_xscroll[1]) << 8) + exedexes_nbg_xscroll[0]);
+ tilemap_draw(bitmap, cliprect, fg_tilemap, 0, 0);
+ }
+
+ draw_sprites(machine, bitmap, cliprect, 0);
+
+ if (chon)
+ {
+ tilemap_draw(bitmap, cliprect, tx_tilemap, 0, 0);
+ }
+ return 0;
+}
+
+VIDEO_EOF( exedexes )
+{
+ buffer_spriteram_w(0,0);
+}