/*************************************************************************** video.c Functions to emulate the video hardware of the machine. ***************************************************************************/ #include "driver.h" int yiear_nmi_enable; static tilemap *bg_tilemap; /*************************************************************************** Convert the color PROMs into a more useable format. Yie Ar Kung-Fu has one 32x8 palette PROM, connected to the RGB output this way: bit 7 -- 220 ohm resistor -- BLUE -- 470 ohm resistor -- BLUE -- 220 ohm resistor -- GREEN -- 470 ohm resistor -- GREEN -- 1 kohm resistor -- GREEN -- 220 ohm resistor -- RED -- 470 ohm resistor -- RED bit 0 -- 1 kohm resistor -- RED ***************************************************************************/ PALETTE_INIT( yiear ) { int i; 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++; } } WRITE8_HANDLER( yiear_videoram_w ) { videoram[offset] = data; tilemap_mark_tile_dirty(bg_tilemap, offset / 2); } WRITE8_HANDLER( yiear_control_w ) { /* bit 0 flips screen */ if (flip_screen != (data & 0x01)) { flip_screen_set(data & 0x01); tilemap_mark_all_tiles_dirty(ALL_TILEMAPS); } /* bit 1 is NMI enable */ yiear_nmi_enable = data & 0x02; /* bit 2 is IRQ enable */ interrupt_enable_w(0, data & 0x04); /* bits 3 and 4 are coin counters */ coin_counter_w(0, data & 0x08); coin_counter_w(1, data & 0x10); } static TILE_GET_INFO( get_bg_tile_info ) { int offs = tile_index * 2; int attr = videoram[offs]; int code = videoram[offs + 1] | ((attr & 0x10) << 4); // int color = (attr & 0xf0) >> 4; int flags = ((attr & 0x80) ? TILE_FLIPX : 0) | ((attr & 0x40) ? TILE_FLIPY : 0); SET_TILE_INFO(0, code, 0, flags); } VIDEO_START( yiear ) { 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 - 2;offs >= 0;offs -= 2) { int attr = spriteram[offs]; int code = spriteram_2[offs + 1] + 256 * (attr & 0x01); int color = 0; int flipx = ~attr & 0x40; int flipy = attr & 0x80; int sy = 240 - spriteram[offs + 1]; int sx = spriteram_2[offs]; if (flip_screen) { sy = 240 - sy; flipy = !flipy; } if (offs < 0x26) { sy++; /* fix title screen & garbage at the bottom of the screen */ } drawgfx(bitmap, machine->gfx[1], code, color, flipx, flipy, sx, sy, cliprect, TRANSPARENCY_PEN, 0); } } VIDEO_UPDATE( yiear ) { tilemap_draw(bitmap, cliprect, bg_tilemap, 0, 0); draw_sprites(machine, bitmap, cliprect); return 0; }