diff options
Diffstat (limited to 'src/mame/video/overdriv.c')
-rw-r--r-- | src/mame/video/overdriv.c | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/src/mame/video/overdriv.c b/src/mame/video/overdriv.c new file mode 100644 index 00000000000..dff509c287e --- /dev/null +++ b/src/mame/video/overdriv.c @@ -0,0 +1,87 @@ +#include "driver.h" +#include "video/konamiic.h" + + +static int zoom_colorbase[2],road_colorbase[2],sprite_colorbase; + + +/*************************************************************************** + + Callbacks for the K053247 + +***************************************************************************/ + +static void overdriv_sprite_callback(int *code,int *color,int *priority_mask) +{ + int pri = (*color & 0xffe0) >> 5; /* ??????? */ + if (pri) *priority_mask = 0x02; + else *priority_mask = 0x00; + + *color = sprite_colorbase + (*color & 0x001f); +} + + +/*************************************************************************** + + Callbacks for the K051316 + +***************************************************************************/ + +static void zoom_callback_0(int *code,int *color,int *flags) +{ + *flags = (*color & 0x40) ? TILE_FLIPX : 0; + *code |= ((*color & 0x03) << 8); + *color = zoom_colorbase[0] + ((*color & 0x3c) >> 2); +} + +static void zoom_callback_1(int *code,int *color,int *flags) +{ + *flags = (*color & 0x40) ? TILE_FLIPX : 0; + *code |= ((*color & 0x03) << 8); + *color = zoom_colorbase[1] + ((*color & 0x3c) >> 2); +} + + + +/*************************************************************************** + + Start the video hardware emulation. + +***************************************************************************/ + +VIDEO_START( overdriv ) +{ + K053251_vh_start(); + K051316_vh_start_0(machine,REGION_GFX2,4,TRUE,0,zoom_callback_0); + K051316_vh_start_1(machine,REGION_GFX3,4,FALSE,0,zoom_callback_1); + K053247_vh_start(machine, REGION_GFX1,77,22,NORMAL_PLANE_ORDER,overdriv_sprite_callback); + + K051316_wraparound_enable(0,1); + K051316_set_offset(0,14,-1); + K051316_set_offset(1,15,0); +} + + + +/*************************************************************************** + + Display refresh + +***************************************************************************/ + +VIDEO_UPDATE( overdriv ) +{ + sprite_colorbase = K053251_get_palette_index(K053251_CI0); + road_colorbase[1] = K053251_get_palette_index(K053251_CI1); + road_colorbase[0] = K053251_get_palette_index(K053251_CI2); + zoom_colorbase[1] = K053251_get_palette_index(K053251_CI3); + zoom_colorbase[0] = K053251_get_palette_index(K053251_CI4); + + fillbitmap(priority_bitmap,0,cliprect); + + K051316_zoom_draw_0(bitmap,cliprect,0,0); + K051316_zoom_draw_1(bitmap,cliprect,0,1); + + K053247_sprites_draw(machine, bitmap,cliprect); + return 0; +} |