#include "emu.h" #include "includes/gunsmoke.h" /*************************************************************************** Convert the color PROMs into a more useable format. Gunsmoke has three 256x4 palette PROMs (one per gun) and a lot ;-) of 256x4 lookup table PROMs. 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( gunsmoke ) { int i; /* allocate the colortable */ machine.colortable = colortable_alloc(machine, 0x100); /* create a lookup table for the palette */ for (i = 0; i < 0x100; i++) { int r = pal4bit(color_prom[i + 0x000]); int g = pal4bit(color_prom[i + 0x100]); int b = pal4bit(color_prom[i + 0x200]); colortable_palette_set_color(machine.colortable, i, MAKE_RGB(r, g, b)); } /* color_prom now points to the beginning of the lookup table */ color_prom += 0x300; /* characters use colors 0x40-0x4f */ for (i = 0; i < 0x80; i++) { UINT8 ctabentry = color_prom[i] | 0x40; colortable_entry_set_value(machine.colortable, i, ctabentry); } /* background tiles use colors 0-0x3f */ for (i = 0x100; i < 0x200; i++) { UINT8 ctabentry = color_prom[i] | ((color_prom[i + 0x100] & 0x03) << 4); colortable_entry_set_value(machine.colortable, i - 0x80, ctabentry); } /* sprites use colors 0x80-0xff */ for (i = 0x300; i < 0x400; i++) { UINT8 ctabentry = color_prom[i] | ((color_prom[i + 0x100] & 0x07) << 4) | 0x80; colortable_entry_set_value(machine.colortable, i - 0x180, ctabentry); } } WRITE8_HANDLER( gunsmoke_videoram_w ) { gunsmoke_state *state = space->machine().driver_data(); state->m_videoram[offset] = data; tilemap_mark_tile_dirty(state->m_fg_tilemap, offset); } WRITE8_HANDLER( gunsmoke_colorram_w ) { gunsmoke_state *state = space->machine().driver_data(); state->m_colorram[offset] = data; tilemap_mark_tile_dirty(state->m_fg_tilemap, offset); } WRITE8_HANDLER( gunsmoke_c804_w ) { gunsmoke_state *state = space->machine().driver_data(); /* bits 0 and 1 are for coin counters */ coin_counter_w(space->machine(), 1, data & 0x01); coin_counter_w(space->machine(), 0, data & 0x02); /* bits 2 and 3 select the ROM bank */ memory_set_bank(space->machine(), "bank1", (data & 0x0c) >> 2); /* bit 5 resets the sound CPU? - we ignore it */ /* bit 6 flips screen */ flip_screen_set(space->machine(), data & 0x40); /* bit 7 enables characters? */ state->m_chon = data & 0x80; } WRITE8_HANDLER( gunsmoke_d806_w ) { gunsmoke_state *state = space->machine().driver_data(); /* bits 0-2 select the sprite 3 bank */ state->m_sprite3bank = data & 0x07; /* bit 4 enables bg 1? */ state->m_bgon = data & 0x10; /* bit 5 enables sprites? */ state->m_objon = data & 0x20; } static TILE_GET_INFO( get_bg_tile_info ) { UINT8 *tilerom = machine.region("gfx4")->base(); int offs = tile_index * 2; int attr = tilerom[offs + 1]; int code = tilerom[offs] + ((attr & 0x01) << 8); int color = (attr & 0x3c) >> 2; int flags = TILE_FLIPYX((attr & 0xc0) >> 6); SET_TILE_INFO(1, code, color, flags); } static TILE_GET_INFO( get_fg_tile_info ) { gunsmoke_state *state = machine.driver_data(); int attr = state->m_colorram[tile_index]; int code = state->m_videoram[tile_index] + ((attr & 0xe0) << 2); int color = attr & 0x1f; tileinfo->group = color; SET_TILE_INFO(0, code, color, 0); } VIDEO_START( gunsmoke ) { gunsmoke_state *state = machine.driver_data(); state->m_bg_tilemap = tilemap_create(machine, get_bg_tile_info, tilemap_scan_cols, 32, 32, 2048, 8); state->m_fg_tilemap = tilemap_create(machine, get_fg_tile_info, tilemap_scan_rows, 8, 8, 32, 32); colortable_configure_tilemap_groups(machine.colortable, state->m_fg_tilemap, machine.gfx[0], 0x4f); } static void draw_sprites( running_machine &machine, bitmap_t *bitmap, const rectangle *cliprect ) { gunsmoke_state *state = machine.driver_data(); UINT8 *spriteram = state->m_spriteram; int offs; for (offs = state->m_spriteram_size - 32; offs >= 0; offs -= 32) { int attr = spriteram[offs + 1]; int bank = (attr & 0xc0) >> 6; int code = spriteram[offs]; int color = attr & 0x0f; int flipx = 0; int flipy = attr & 0x10; int sx = spriteram[offs + 3] - ((attr & 0x20) << 3); int sy = spriteram[offs + 2]; if (bank == 3) bank += state->m_sprite3bank; code += 256 * bank; if (flip_screen_get(machine)) { sx = 240 - sx; sy = 240 - sy; flipx = !flipx; flipy = !flipy; } drawgfx_transpen(bitmap, cliprect, machine.gfx[2], code, color, flipx, flipy, sx, sy, 0); } } SCREEN_UPDATE( gunsmoke ) { gunsmoke_state *state = screen->machine().driver_data(); tilemap_set_scrollx(state->m_bg_tilemap, 0, state->m_scrollx[0] + 256 * state->m_scrollx[1]); tilemap_set_scrolly(state->m_bg_tilemap, 0, state->m_scrolly[0]); if (state->m_bgon) tilemap_draw(bitmap, cliprect, state->m_bg_tilemap, 0, 0); else bitmap_fill(bitmap, cliprect, get_black_pen(screen->machine())); if (state->m_objon) draw_sprites(screen->machine(), bitmap, cliprect); if (state->m_chon) tilemap_draw(bitmap, cliprect, state->m_fg_tilemap, 0, 0); return 0; }