/*************************************************************************** video.c Functions to emulate the video hardware of the machine. ***************************************************************************/ #include "emu.h" #include "includes/zodiack.h" WRITE8_HANDLER( zodiack_videoram_w ) { zodiack_state *state = space->machine().driver_data(); state->m_videoram[offset] = data; tilemap_mark_tile_dirty(state->m_fg_tilemap, offset); } WRITE8_HANDLER( zodiack_videoram2_w ) { zodiack_state *state = space->machine().driver_data(); state->m_videoram_2[offset] = data; tilemap_mark_tile_dirty(state->m_bg_tilemap, offset); } WRITE8_HANDLER( zodiack_attributes_w ) { zodiack_state *state = space->machine().driver_data(); if ((offset & 1) && state->m_attributeram[offset] != data) { int i; for (i = offset / 2; i < state->m_videoram_size; i += 32) { tilemap_mark_tile_dirty(state->m_bg_tilemap, i); tilemap_mark_tile_dirty(state->m_fg_tilemap, i); } } state->m_attributeram[offset] = data; } WRITE8_HANDLER( zodiack_flipscreen_w ) { if (flip_screen_get(space->machine()) != (~data & 0x01)) { flip_screen_set(space->machine(), ~data & 0x01); tilemap_mark_all_tiles_dirty_all(space->machine()); } } PALETTE_INIT( zodiack ) { int i; /* allocate the colortable */ machine.colortable = colortable_alloc(machine, 0x31); /* create a lookup table for the palette */ for (i = 0; i < 0x30; i++) { int bit0, bit1, bit2; int r, g, b; /* red component */ bit0 = (color_prom[i] >> 0) & 0x01; bit1 = (color_prom[i] >> 1) & 0x01; bit2 = (color_prom[i] >> 2) & 0x01; r = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2; /* green component */ bit0 = (color_prom[i] >> 3) & 0x01; bit1 = (color_prom[i] >> 4) & 0x01; bit2 = (color_prom[i] >> 5) & 0x01; g = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2; /* blue component */ bit0 = 0; bit1 = (color_prom[i] >> 6) & 0x01; bit2 = (color_prom[i] >> 7) & 0x01; b = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2; colortable_palette_set_color(machine.colortable, i, MAKE_RGB(r, g, b)); } /* white for bullets */ colortable_palette_set_color(machine.colortable, 0x30, RGB_WHITE); for (i = 0; i < 0x20; i++) if ((i & 3) == 0) colortable_entry_set_value(machine.colortable, i, 0); for (i = 0; i < 0x10; i += 2) { colortable_entry_set_value(machine.colortable, 0x20 + i, 32 + (i / 2)); colortable_entry_set_value(machine.colortable, 0x21 + i, 40 + (i / 2)); } /* bullet */ colortable_entry_set_value(machine.colortable, 0x30, 0); colortable_entry_set_value(machine.colortable, 0x31, 0x30); } static TILE_GET_INFO( get_bg_tile_info ) { zodiack_state *state = machine.driver_data(); int code = state->m_videoram_2[tile_index]; int color = (state->m_attributeram[2 * (tile_index % 32) + 1] >> 4) & 0x07; SET_TILE_INFO(0, code, color, 0); } static TILE_GET_INFO( get_fg_tile_info ) { zodiack_state *state = machine.driver_data(); int code = state->m_videoram[tile_index]; int color = state->m_attributeram[2 * (tile_index % 32) + 1] & 0x07; SET_TILE_INFO(3, code, color, 0); } VIDEO_START( zodiack ) { zodiack_state *state = machine.driver_data(); state->m_bg_tilemap = tilemap_create(machine, get_bg_tile_info, tilemap_scan_rows, 8, 8, 32, 32); state->m_fg_tilemap = tilemap_create(machine, get_fg_tile_info, tilemap_scan_rows, 8, 8, 32, 32); tilemap_set_transparent_pen(state->m_fg_tilemap, 0); tilemap_set_scroll_cols(state->m_fg_tilemap, 32); /* FIXME: flip_screen_x should not be written. */ flip_screen_set_no_update(machine, 0); } static void draw_bullets( running_machine &machine, bitmap_t *bitmap, const rectangle *cliprect ) { zodiack_state *state = machine.driver_data(); int offs; for (offs = 0; offs < state->m_bulletsram_size; offs += 4) { int x, y; x = state->m_bulletsram[offs + 3] + 7; y = 255 - state->m_bulletsram[offs + 1]; if (flip_screen_get(machine) && state->m_percuss_hardware) { y = 255 - y; } drawgfx_transpen( bitmap, cliprect,machine.gfx[2], 0, /* this is just a dot, generated by the hardware */ 0, 0,0, x,y,0); } } static void draw_sprites( running_machine &machine, bitmap_t *bitmap, const rectangle *cliprect ) { zodiack_state *state = machine.driver_data(); int offs; for (offs = state->m_spriteram_size - 4; offs >= 0; offs -= 4) { int flipx, flipy, sx, sy, spritecode; sx = 240 - state->m_spriteram[offs + 3]; sy = 240 - state->m_spriteram[offs]; flipx = !(state->m_spriteram[offs + 1] & 0x40); flipy = state->m_spriteram[offs + 1] & 0x80; spritecode = state->m_spriteram[offs + 1] & 0x3f; if (flip_screen_get(machine) && state->m_percuss_hardware) { sy = 240 - sy; flipy = !flipy; } drawgfx_transpen(bitmap,cliprect,machine.gfx[1], spritecode, state->m_spriteram[offs + 2] & 0x07, flipx, flipy, sx, sy, 0); } } SCREEN_UPDATE( zodiack ) { zodiack_state *state = screen->machine().driver_data(); int i; for (i = 0; i < 32; i++) tilemap_set_scrolly(state->m_fg_tilemap, i, state->m_attributeram[i * 2]); tilemap_draw(bitmap, cliprect, state->m_bg_tilemap, 0, 0); tilemap_draw(bitmap, cliprect, state->m_fg_tilemap, 0, 0); draw_bullets(screen->machine(), bitmap, cliprect); draw_sprites(screen->machine(), bitmap, cliprect); return 0; }