diff options
Diffstat (limited to 'src/mame/video/toypop.c')
-rw-r--r-- | src/mame/video/toypop.c | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/src/mame/video/toypop.c b/src/mame/video/toypop.c new file mode 100644 index 00000000000..4eeb6b96f97 --- /dev/null +++ b/src/mame/video/toypop.c @@ -0,0 +1,236 @@ +/*************************************************************************** + + video.c + + Functions to emulate the video hardware of the machine. + +***************************************************************************/ + +#include "driver.h" + +UINT8 *toypop_videoram; + +extern UINT8 *m68000_sharedram; + +static tilemap *bg_tilemap; +UINT16 *toypop_bg_image; +static int bitmapflip,palettebank; + +static colortable *toypop_colortable; + + +/*************************************************************************** + + Convert the color PROMs into a more useable format. + + toypop has three 256x4 palette PROM and two 256x8 color lookup table PROMs + (one for characters, one for sprites). + +***************************************************************************/ + +PALETTE_INIT( toypop ) +{ + int i; + + /* allocate the colortable */ + toypop_colortable = colortable_alloc(machine, 256); + + for (i = 0;i < 256;i++) + { + int bit0,bit1,bit2,bit3,r,g,b; + + // red component + bit0 = (color_prom[i] >> 0) & 0x01; + bit1 = (color_prom[i] >> 1) & 0x01; + bit2 = (color_prom[i] >> 2) & 0x01; + bit3 = (color_prom[i] >> 3) & 0x01; + r = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3; + // green component + bit0 = (color_prom[i+0x100] >> 0) & 0x01; + bit1 = (color_prom[i+0x100] >> 1) & 0x01; + bit2 = (color_prom[i+0x100] >> 2) & 0x01; + bit3 = (color_prom[i+0x100] >> 3) & 0x01; + g = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3; + // blue component + bit0 = (color_prom[i+0x200] >> 0) & 0x01; + bit1 = (color_prom[i+0x200] >> 1) & 0x01; + bit2 = (color_prom[i+0x200] >> 2) & 0x01; + bit3 = (color_prom[i+0x200] >> 3) & 0x01; + b = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3; + + colortable_palette_set_color(toypop_colortable, i, MAKE_RGB(r,g,b)); + } + + for (i = 0;i < 256;i++) + { + UINT8 entry; + + // characters + colortable_entry_set_value(toypop_colortable, i + 0*256, (color_prom[i + 0x300] & 0x0f) | 0x70); + colortable_entry_set_value(toypop_colortable, i + 1*256, (color_prom[i + 0x300] & 0x0f) | 0xf0); + // sprites + entry = color_prom[i + 0x500]; + colortable_entry_set_value(toypop_colortable, i + 2*256, entry); + } + for (i = 0;i < 16;i++) + { + // background + colortable_entry_set_value(toypop_colortable, i + 3*256 + 0*16, 0x60 + i); + colortable_entry_set_value(toypop_colortable, i + 3*256 + 1*16, 0xe0 + i); + } +} + + + +/*************************************************************************** + + Callbacks for the TileMap code + +***************************************************************************/ + +/* convert from 32x32 to 36x28 */ +static TILEMAP_MAPPER( tilemap_scan ) +{ + int offs; + + row += 2; + col -= 2; + if (col & 0x20) + offs = row + ((col & 0x1f) << 5); + else + offs = col + (row << 5); + + return offs; +} + +static TILE_GET_INFO( get_tile_info ) +{ + UINT8 attr = toypop_videoram[tile_index + 0x400]; + SET_TILE_INFO( + 0, + toypop_videoram[tile_index], + (attr & 0x3f) + 0x40 * palettebank, + 0); +} + + + +/*************************************************************************** + + Start the video hardware emulation. + +***************************************************************************/ + +VIDEO_START( toypop ) +{ + bg_tilemap = tilemap_create(get_tile_info,tilemap_scan,TILEMAP_TYPE_PEN,8,8,36,28); + + tilemap_set_transparent_pen(bg_tilemap, 0); +} + + + +/*************************************************************************** + + Memory handlers + +***************************************************************************/ + +WRITE8_HANDLER( toypop_videoram_w ) +{ + toypop_videoram[offset] = data; + tilemap_mark_tile_dirty(bg_tilemap,offset & 0x3ff); +} + +WRITE8_HANDLER( toypop_palettebank_w ) +{ + if (palettebank != (offset & 1)) + { + palettebank = offset & 1; + tilemap_mark_all_tiles_dirty(ALL_TILEMAPS); + } +} + +WRITE16_HANDLER( toypop_flipscreen_w ) +{ + bitmapflip = offset & 1; +} + +READ16_HANDLER( toypop_merged_background_r ) +{ + int data1, data2; + + // 0x0a0b0c0d is read as 0xabcd + data1 = toypop_bg_image[2*offset]; + data2 = toypop_bg_image[2*offset + 1]; + return ((data1 & 0xf00) << 4) | ((data1 & 0xf) << 8) | ((data2 & 0xf00) >> 4) | (data2 & 0xf); +} + +WRITE16_HANDLER( toypop_merged_background_w ) +{ + // 0xabcd is written as 0x0a0b0c0d in the background image + if (ACCESSING_MSB) + toypop_bg_image[2*offset] = ((data & 0xf00) >> 8) | ((data & 0xf000) >> 4); + + if (ACCESSING_LSB) + toypop_bg_image[2*offset+1] = (data & 0xf) | ((data & 0xf0) << 4); +} + +static void draw_background(mame_bitmap *bitmap) +{ + register int offs, x, y; + UINT8 scanline[288]; + + // copy the background image from RAM (0x190200-0x19FDFF) to bitmap + if (bitmapflip) + { + offs = 0xFDFE/2; + for (y = 0; y < 224; y++) + { + for (x = 0; x < 288; x+=2) + { + UINT16 data = toypop_bg_image[offs]; + scanline[x] = data; + scanline[x+1] = data >> 8; + offs--; + } + draw_scanline8(bitmap, 0, y, 288, scanline, &Machine->pens[0x300 + 0x10*palettebank], -1); + } + } + else + { + offs = 0x200/2; + for (y = 0; y < 224; y++) + { + for (x = 0; x < 288; x+=2) + { + UINT16 data = toypop_bg_image[offs]; + scanline[x] = data >> 8; + scanline[x+1] = data; + offs++; + } + draw_scanline8(bitmap, 0, y, 288, scanline, &Machine->pens[0x300 + 0x10*palettebank], -1); + } + } +} + + + +/*************************************************************************** + + Display refresh + +***************************************************************************/ + +/* from mappy.c */ +void mappy_draw_sprites(running_machine *machine, mame_bitmap *bitmap, const rectangle *cliprect, int xoffs, int yoffs, colortable *ctable, int transcolor); + + +VIDEO_UPDATE( toypop ) +{ + draw_background(bitmap); + tilemap_draw(bitmap,cliprect,bg_tilemap,0,0); + + mappy_draw_sprites(machine, bitmap, cliprect, -31, -8, toypop_colortable, 0xff); + return 0; +} |