/*************************************************************************** video.c Functions to emulate the video hardware of the machine. ***************************************************************************/ #include "driver.h" #include "video/resnet.h" UINT8 *bagman_video_enable; static tilemap *bg_tilemap; WRITE8_HANDLER( bagman_videoram_w ) { videoram[offset] = data; tilemap_mark_tile_dirty(bg_tilemap, offset); } WRITE8_HANDLER( bagman_colorram_w ) { colorram[offset] = data; tilemap_mark_tile_dirty(bg_tilemap, offset); } /*************************************************************************** Convert the color PROMs into a more useable format. Bagman has two 32 bytes palette PROMs, connected to the RGB output this way: bit 7 -- 220 ohm resistor -- \ -- 470 ohm resistor -- | -- 470 ohm pulldown resistor -- BLUE -- 220 ohm resistor -- \ -- 470 ohm resistor -- | -- 470 ohm pulldown resistor -- GREEN -- 1 kohm resistor -- / -- 220 ohm resistor -- \ -- 470 ohm resistor -- | -- 470 ohm pulldown resistor -- RED bit 0 -- 1 kohm resistor -- / ***************************************************************************/ PALETTE_INIT( bagman ) { int i; static const int resistances_rg[3] = { 1000, 470, 220 }; static const int resistances_b [2] = { 470, 220 }; double weights_r[3], weights_g[3], weights_b[2]; compute_resistor_weights(0, 255, -1.0, 3, resistances_rg, weights_r, 470, 0, 3, resistances_rg, weights_g, 470, 0, 2, resistances_b, weights_b, 470, 0); for (i = 0; i < machine->drv->total_colors; i++) { int bit0, bit1, bit2, r, g, b; /* red component */ bit0 = (color_prom[i] >> 0) & 0x01; bit1 = (color_prom[i] >> 1) & 0x01; bit2 = (color_prom[i] >> 2) & 0x01; r = combine_3_weights(weights_r, bit0, bit1, bit2); /* green component */ bit0 = (color_prom[i] >> 3) & 0x01; bit1 = (color_prom[i] >> 4) & 0x01; bit2 = (color_prom[i] >> 5) & 0x01; g = combine_3_weights(weights_g, bit0, bit1, bit2); /* blue component */ bit0 = (color_prom[i] >> 6) & 0x01; bit1 = (color_prom[i] >> 7) & 0x01; b = combine_2_weights(weights_b, bit0, bit1); palette_set_color(machine,i,MAKE_RGB(r,g,b)); } } WRITE8_HANDLER( bagman_flipscreen_w ) { if (flip_screen != (data & 0x01)) { flip_screen_set(data & 0x01); tilemap_mark_all_tiles_dirty(bg_tilemap); } } static TILE_GET_INFO( get_bg_tile_info ) { int gfxbank = (machine->gfx[2] && (colorram[tile_index] & 0x10)) ? 2 : 0; int code = videoram[tile_index] + 8 * (colorram[tile_index] & 0x20); int color = colorram[tile_index] & 0x0f; SET_TILE_INFO(gfxbank, code, color, 0); } VIDEO_START( bagman ) { bg_tilemap = tilemap_create(get_bg_tile_info, tilemap_scan_rows, 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 sx,sy,flipx,flipy; sx = spriteram[offs + 3]; sy = 240 - spriteram[offs + 2]; flipx = spriteram[offs] & 0x40; flipy = spriteram[offs] & 0x80; if (flip_screen_x) { sx = 240 - sx +1; /* compensate misplacement */ flipx = !flipx; } if (flip_screen_y) { sy = 240 - sy; flipy = !flipy; } if (spriteram[offs + 2] && spriteram[offs + 3]) drawgfx(bitmap,machine->gfx[1], (spriteram[offs] & 0x3f) + 2 * (spriteram[offs + 1] & 0x20), spriteram[offs + 1] & 0x1f, flipx,flipy, sx,sy+1, /* compensate misplacement */ cliprect,TRANSPARENCY_PEN,0); } } VIDEO_UPDATE( bagman ) { if (*bagman_video_enable == 0) return 0; tilemap_draw(bitmap, cliprect, bg_tilemap, 0, 0); draw_sprites(machine, bitmap, cliprect); return 0; }