diff options
Diffstat (limited to 'src/mame/video/exedexes.c')
-rw-r--r-- | src/mame/video/exedexes.c | 254 |
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); +} |