/*************************************************************************** video.c Functions to emulate the video hardware of the machine. ***************************************************************************/ #include "driver.h" UINT8 *tankbatt_bulletsram; size_t tankbatt_bulletsram_size; static tilemap *bg_tilemap; /*************************************************************************** Convert the color PROMs into a more useable format. ***************************************************************************/ PALETTE_INIT( tankbatt ) { int i; #define RES_1 0xc0 /* this is a guess */ #define RES_2 0x3f /* this is a guess */ /* Stick black in there */ palette_set_color(machine,0,MAKE_RGB(0,0,0)); /* ? Skip the first byte ? */ color_prom++; for (i = 1;i < machine->drv->total_colors;i++) { int bit0, bit1, bit2, bit3, r, g, b; bit0 = (*color_prom >> 0) & 0x01; /* intensity */ bit1 = (*color_prom >> 1) & 0x01; /* red */ bit2 = (*color_prom >> 2) & 0x01; /* green */ bit3 = (*color_prom >> 3) & 0x01; /* blue */ /* red component */ r = RES_1 * bit1; if (bit1) r += RES_2 * bit0; /* green component */ g = RES_1 * bit2; if (bit2) g += RES_2 * bit0; /* blue component */ b = RES_1 * bit3; if (bit3) b += RES_2 * bit0; palette_set_color(machine,i,MAKE_RGB(r,g,b)); color_prom += 4; } for (i = 0;i < 128;i++) { colortable[i++] = 0; colortable[i] = (i/2) + 1; } } WRITE8_HANDLER( tankbatt_videoram_w ) { videoram[offset] = data; tilemap_mark_tile_dirty(bg_tilemap, offset); } static TILE_GET_INFO( get_bg_tile_info ) { int code = videoram[tile_index]; int color = videoram[tile_index] >> 2; SET_TILE_INFO(0, code, color, 0); } VIDEO_START( tankbatt ) { bg_tilemap = tilemap_create(get_bg_tile_info, tilemap_scan_rows, TILEMAP_TYPE_PEN, 8, 8, 32, 32); } static void draw_bullets(running_machine *machine, mame_bitmap *bitmap, const rectangle *cliprect) { int offs; for (offs = 0;offs < tankbatt_bulletsram_size;offs += 2) { int color = 63; /* cyan, same color as the tanks */ int x = tankbatt_bulletsram[offs + 1]; int y = 255 - tankbatt_bulletsram[offs] - 2; drawgfx(bitmap,machine->gfx[1], 0, /* this is just a square, generated by the hardware */ color, 0,0, x,y, cliprect,TRANSPARENCY_NONE,0); } } VIDEO_UPDATE( tankbatt ) { tilemap_draw(bitmap, cliprect, bg_tilemap, 0, 0); draw_bullets(machine, bitmap, cliprect); return 0; }