/*************************************************************************** video.c Functions to emulate the video hardware of the machine. ***************************************************************************/ #include "emu.h" #include "includes/hanaawas.h" /*************************************************************************** Convert the color PROMs into a more useable format. ***************************************************************************/ PALETTE_INIT( hanaawas ) { int i; /* allocate the colortable */ machine.colortable = colortable_alloc(machine, 0x10); /* create a lookup table for the palette */ for (i = 0; i < 0x10; 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)); } /* color_prom now points to the beginning of the lookup table */ color_prom += 0x20; /* character lookup table. The 1bpp tiles really only use colors 0-0x0f and the 3bpp ones 0x10-0x1f */ for (i = 0; i < 0x100; i++) { int swapped_i = BITSWAP8(i,2,7,6,5,4,3,1,0); UINT8 ctabentry = color_prom[swapped_i] & 0x0f; colortable_entry_set_value(machine.colortable, i, ctabentry); } } WRITE8_HANDLER( hanaawas_videoram_w ) { hanaawas_state *state = space->machine().driver_data(); state->m_videoram[offset] = data; tilemap_mark_tile_dirty(state->m_bg_tilemap, offset); } WRITE8_HANDLER( hanaawas_colorram_w ) { hanaawas_state *state = space->machine().driver_data(); state->m_colorram[offset] = data; /* dirty both current and next offsets */ tilemap_mark_tile_dirty(state->m_bg_tilemap, offset); tilemap_mark_tile_dirty(state->m_bg_tilemap, (offset + (flip_screen_get(space->machine()) ? -1 : 1)) & 0x03ff); } WRITE8_DEVICE_HANDLER( hanaawas_portB_w ) { /* bit 7 is flip screen */ if (flip_screen_get(device->machine()) != (~data & 0x80)) { flip_screen_set(device->machine(), ~data & 0x80); tilemap_mark_all_tiles_dirty_all(device->machine()); } } static TILE_GET_INFO( get_bg_tile_info ) { hanaawas_state *state = machine.driver_data(); /* the color is determined by the current color byte, but the bank is via the previous one!!! */ int offset = (tile_index + (flip_screen_get(machine) ? 1 : -1)) & 0x3ff; int attr = state->m_colorram[offset]; int gfxbank = (attr & 0x40) >> 6; int code = state->m_videoram[tile_index] + ((attr & 0x20) << 3); int color = state->m_colorram[tile_index] & 0x1f; SET_TILE_INFO(gfxbank, code, color, 0); } VIDEO_START( hanaawas ) { hanaawas_state *state = machine.driver_data(); state->m_bg_tilemap = tilemap_create(machine, get_bg_tile_info, tilemap_scan_rows, 8, 8, 32, 32); } SCREEN_UPDATE( hanaawas ) { hanaawas_state *state = screen->machine().driver_data(); tilemap_draw(bitmap, cliprect, state->m_bg_tilemap, 0, 0); return 0; }