diff options
Diffstat (limited to 'src/mame/video/nova2001.c')
-rw-r--r-- | src/mame/video/nova2001.c | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/src/mame/video/nova2001.c b/src/mame/video/nova2001.c new file mode 100644 index 00000000000..35a40e6dc4c --- /dev/null +++ b/src/mame/video/nova2001.c @@ -0,0 +1,194 @@ +/******************************************************************************* + + Nova 2001 - Video Description: + -------------------------------------------------------------------------- + + Foreground Playfield Chars (static) + character code index from first set of chars + Foreground Playfield color modifier RAM + Char colors are normally taken from the first set of 16, + This is the pen for "color 1" for this tile (from the first 16 pens) + + Background Playfield Chars (scrolling) + character code index from second set of chars + Foreground Playfield color modifier RAM + Char colors are normally taken from the second set of 16, + This is the pen for "color 1" for this tile (from the second 16 pens) + (Scrolling in controlled via the 8910 A and B port outputs) + + Sprite memory is made of 32 byte records: + + Sprite+0, 0x80 = Sprite Bank + Sprite+0, 0x7f = Sprite Character Code + Sprite+1, 0xff = X location + Sprite+2, 0xff = Y location + Sprite+3, 0x20 = Y Flip + Sprite+3, 0x10 = X Flip + Sprite+3, 0x0f = pen for "color 1" taken from the first 16 colors + Sprite+3, 0x80 + Sprite+3, 0x40 + + All the rest are unknown and/or uneccessary. + +*******************************************************************************/ + +#include "driver.h" + +UINT8 *nova2001_videoram2, *nova2001_colorram2; + +static tilemap *bg_tilemap, *fg_tilemap; + +PALETTE_INIT( nova2001 ) +{ + int i,j; + + + for (i = 0;i < machine->drv->total_colors;i++) + { + int intensity,r,g,b; + + + intensity = (*color_prom >> 0) & 0x03; + /* red component */ + r = (((*color_prom >> 0) & 0x0c) | intensity) * 0x11; + /* green component */ + g = (((*color_prom >> 2) & 0x0c) | intensity) * 0x11; + /* blue component */ + b = (((*color_prom >> 4) & 0x0c) | intensity) * 0x11; + + palette_set_color(machine,i,MAKE_RGB(r,g,b)); + color_prom++; + } + + /* Color #1 is used for palette animation. */ + + /* To handle this, color entries 0-15 are based on */ + /* the primary 16 colors, while color entries 16-31 */ + /* are based on the secondary set. */ + + /* The only difference among 0-15 and 16-31 is that */ + /* color #1 changes each time */ + + for (i = 0;i < 16;i++) + { + for (j = 0;j < 16;j++) + { + if (j == 1) + { + colortable[16*i+1] = i; + colortable[16*i+16*16+1] = i+16; + } + else + { + colortable[16*i+j] = j; + colortable[16*i+16*16+j] = j+16; + } + } + } +} + +WRITE8_HANDLER( nova2001_videoram_w ) +{ + videoram[offset] = data; + tilemap_mark_tile_dirty(bg_tilemap, offset); +} + +WRITE8_HANDLER( nova2001_colorram_w ) +{ + colorram[offset] = data; + tilemap_mark_tile_dirty(bg_tilemap, offset); +} + +WRITE8_HANDLER( nova2001_videoram2_w ) +{ + nova2001_videoram2[offset] = data; + tilemap_mark_tile_dirty(fg_tilemap, offset); +} + +WRITE8_HANDLER( nova2001_colorram2_w ) +{ + nova2001_colorram2[offset] = data; + tilemap_mark_tile_dirty(fg_tilemap, offset); +} + +WRITE8_HANDLER( nova2001_scroll_x_w ) +{ + tilemap_set_scrollx(bg_tilemap, 0, data - (flip_screen ? 0 : 7)); +} + +WRITE8_HANDLER( nova2001_scroll_y_w ) +{ + tilemap_set_scrolly(bg_tilemap, 0, data); +} + +WRITE8_HANDLER( nova2001_flipscreen_w ) +{ + if (flip_screen != (~data & 0x01)) + { + flip_screen_set(~data & 0x01); + tilemap_mark_all_tiles_dirty(ALL_TILEMAPS); + } +} + +static TILE_GET_INFO( get_bg_tile_info ) +{ + int code = videoram[tile_index]; + int color = colorram[tile_index] & 0x0f; + + SET_TILE_INFO(1, code, color, 0); +} + +static TILE_GET_INFO( get_fg_tile_info ) +{ + int code = nova2001_videoram2[tile_index]; + int color = nova2001_colorram2[tile_index] & 0x0f; + + SET_TILE_INFO(0, code, color, 0); +} + +VIDEO_START( nova2001 ) +{ + bg_tilemap = tilemap_create(get_bg_tile_info, tilemap_scan_rows, + TILEMAP_TYPE_PEN, 8, 8, 32, 32); + + fg_tilemap = tilemap_create(get_fg_tile_info, tilemap_scan_rows, + TILEMAP_TYPE_PEN, 8, 8, 32, 32); + + tilemap_set_transparent_pen(fg_tilemap, 0); +} + +static void draw_sprites(running_machine *machine, mame_bitmap *bitmap, const rectangle *cliprect ) +{ + int offs; + + for (offs = 0;offs < spriteram_size;offs += 32) + { + int flipx = spriteram[offs+3] & 0x10; + int flipy = spriteram[offs+3] & 0x20; + int sx = spriteram[offs+1]; + int sy = spriteram[offs+2]; + + if (flip_screen) + { + sx = 240 - sx; + sy = 240 - sy; + flipx = !flipx; + flipy = !flipy; + } + + drawgfx(bitmap,machine->gfx[2 + ((spriteram[offs+0] & 0x80) >> 7)], + spriteram[offs+0] & 0x7f, + spriteram[offs+3] & 0x0f, + flipx,flipy, + sx,sy, + cliprect,TRANSPARENCY_PEN,0); + } +} + +VIDEO_UPDATE( nova2001 ) +{ + tilemap_draw(bitmap, cliprect, bg_tilemap, 0, 0); + draw_sprites(machine, bitmap, cliprect); + tilemap_draw(bitmap, cliprect, fg_tilemap, 0, 0); + return 0; +} |