/*************************************************************************** Great Swordsman Functions to emulate the video hardware of the machine. ***************************************************************************/ #include "emu.h" #include "includes/gsword.h" static PALETTE_INIT( common ) { int i; /* characters */ for (i = 0; i < 0x100; i++) colortable_entry_set_value(machine.colortable, i, i); /* sprites */ for (i = 0x100; i < 0x200; i++) { UINT8 ctabentry = (BITSWAP8(color_prom[i - 0x100],7,6,5,4,0,1,2,3) & 0x0f) | 0x80; colortable_entry_set_value(machine.colortable, i, ctabentry); } } PALETTE_INIT( josvolly ) { 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; PALETTE_INIT_CALL(common); } PALETTE_INIT( gsword ) { 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 bit0, bit1, bit2; int r, g, b; /* red component */ bit0 = (color_prom[i + 0x100] >> 0) & 1; bit1 = (color_prom[i + 0x100] >> 1) & 1; bit2 = (color_prom[i + 0x100] >> 2) & 1; r = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2; /* green component */ bit0 = (color_prom[i + 0x100] >> 3) & 1; bit1 = (color_prom[i + 0x000] >> 0) & 1; bit2 = (color_prom[i + 0x000] >> 1) & 1; g = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2; /* blue component */ bit0 = 0; bit1 = (color_prom[i + 0x000] >> 2) & 1; bit2 = (color_prom[i + 0x000] >> 3) & 1; 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 += 0x200; PALETTE_INIT_CALL(common); } WRITE8_HANDLER( gsword_videoram_w ) { gsword_state *state = space->machine().driver_data(); UINT8 *videoram = state->m_videoram; videoram[offset] = data; tilemap_mark_tile_dirty(state->m_bg_tilemap, offset); } WRITE8_HANDLER( gsword_charbank_w ) { gsword_state *state = space->machine().driver_data(); if (state->m_charbank != data) { state->m_charbank = data; tilemap_mark_all_tiles_dirty_all(space->machine()); } } WRITE8_HANDLER( gsword_videoctrl_w ) { gsword_state *state = space->machine().driver_data(); if (data & 0x8f) { popmessage("videoctrl %02x",data); } /* bits 5-6 are char palette bank */ if (state->m_charpalbank != ((data & 0x60) >> 5)) { state->m_charpalbank = (data & 0x60) >> 5; tilemap_mark_all_tiles_dirty_all(space->machine()); } /* bit 4 is flip screen */ if (state->m_flipscreen != (data & 0x10)) { state->m_flipscreen = data & 0x10; tilemap_mark_all_tiles_dirty_all(space->machine()); } /* bit 0 could be used but unknown */ /* other bits unused */ } WRITE8_HANDLER( gsword_scroll_w ) { gsword_state *state = space->machine().driver_data(); tilemap_set_scrolly(state->m_bg_tilemap, 0, data); } static TILE_GET_INFO( get_bg_tile_info ) { gsword_state *state = machine.driver_data(); UINT8 *videoram = state->m_videoram; int code = videoram[tile_index] + ((state->m_charbank & 0x03) << 8); int color = ((code & 0x3c0) >> 6) + 16 * state->m_charpalbank; int flags = state->m_flipscreen ? (TILE_FLIPX | TILE_FLIPY) : 0; SET_TILE_INFO(0, code, color, flags); } VIDEO_START( gsword ) { gsword_state *state = machine.driver_data(); state->m_bg_tilemap = tilemap_create(machine, get_bg_tile_info, tilemap_scan_rows, 8, 8, 32, 64); } static void draw_sprites(running_machine &machine, bitmap_t *bitmap, const rectangle *cliprect) { gsword_state *state = machine.driver_data(); int offs; for (offs = 0; offs < state->m_spritexy_size - 1; offs+=2) { int sx,sy,flipx,flipy,spritebank,tile,color; if (state->m_spritexy_ram[offs]!=0xf1) { spritebank = 0; tile = state->m_spritetile_ram[offs]; color = state->m_spritetile_ram[offs+1] & 0x3f; sy = 241-state->m_spritexy_ram[offs]; sx = state->m_spritexy_ram[offs+1]-56; flipx = state->m_spriteattrib_ram[offs] & 0x02; flipy = state->m_spriteattrib_ram[offs] & 0x01; // Adjust sprites that should be far far right! if (sx<0) sx+=256; // Adjuste for 32x32 tiles(#128-256) if (tile > 127) { spritebank = 1; tile -= 128; sy-=16; } if (state->m_flipscreen) { flipx = !flipx; flipy = !flipy; } drawgfx_transmask(bitmap,cliprect,machine.gfx[1+spritebank], tile, color, flipx,flipy, sx,sy, colortable_get_transpen_mask(machine.colortable, machine.gfx[1+spritebank], color, 0x8f)); } } } SCREEN_UPDATE( gsword ) { gsword_state *state = screen->machine().driver_data(); tilemap_draw(bitmap, cliprect, state->m_bg_tilemap, 0, 0); draw_sprites(screen->machine(), bitmap, cliprect); return 0; }