/* Speed Spin video, see driver file for notes */
#include "driver.h"
UINT8 *speedspn_attram;
static tilemap *speedspn_tilemap;
static UINT8 speedspn_display_disable = 0;
static int speedspn_bank_vidram = 0;
static UINT8* speedspn_vidram;
static TILE_GET_INFO( get_speedspn_tile_info )
{
int code = speedspn_vidram[tile_index*2+1] | (speedspn_vidram[tile_index*2] << 8);
int attr = speedspn_attram[tile_index^0x400];
SET_TILE_INFO(0,code,attr & 0x3f,(attr & 0x80) ? TILE_FLIPX : 0);
}
VIDEO_START(speedspn)
{
speedspn_vidram = auto_malloc(0x1000 * 2);
speedspn_tilemap = tilemap_create(get_speedspn_tile_info,tilemap_scan_cols,TILEMAP_TYPE_PEN, 8, 8,64,32);
}
WRITE8_HANDLER( speedspn_vidram_w )
{
speedspn_vidram[offset + speedspn_bank_vidram] = data;
if (speedspn_bank_vidram == 0)
tilemap_mark_tile_dirty(speedspn_tilemap,offset/2);
}
WRITE8_HANDLER( speedspn_attram_w )
{
speedspn_attram[offset] = data;
tilemap_mark_tile_dirty(speedspn_tilemap,offset^0x400);
}
READ8_HANDLER( speedspn_vidram_r )
{
return speedspn_vidram[offset + speedspn_bank_vidram];
}
WRITE8_HANDLER(speedspn_banked_vidram_change)
{
// logerror("VidRam Bank: %04x\n", data);
speedspn_bank_vidram = data & 1;
speedspn_bank_vidram *= 0x1000;
}
WRITE8_HANDLER(speedspn_global_display_w)
{
// logerror("Global display: %u\n", data);
speedspn_display_disable = data & 1;
}
static void draw_sprites(running_machine *machine, mame_bitmap *bitmap, const rectangle *cliprect )
{
const gfx_element *gfx = machine->gfx[1];
UINT8 *source = speedspn_vidram+ 0x1000;
UINT8 *finish = source + 0x1000;
while( source<finish )
{
int xpos = source[0];
int tileno = source[1];
int attr = source[2];
int ypos = source[3];
int color;
if (attr&0x10) xpos +=0x100;
xpos = 0x1f8-xpos;
tileno += ((attr & 0xe0) >> 5) * 0x100;
color = attr & 0x0f;
drawgfx(bitmap,gfx,
tileno,
color,
0,0,
xpos,ypos,
cliprect,TRANSPARENCY_PEN,15);
source +=4;
}
}
VIDEO_UPDATE(speedspn)
{
if (speedspn_display_disable)
{
fillbitmap(bitmap,get_black_pen(machine),cliprect);
return 0;
}
#if 0
{
FILE* f;
f = fopen("vidram.bin","wb");
fwrite(speedspn_vidram, 1, 0x1000 * 2, f);
fclose(f);
}
#endif
tilemap_set_scrollx(speedspn_tilemap,0, 0x100); // verify
tilemap_draw(bitmap,cliprect,speedspn_tilemap,0,0);
draw_sprites(machine, bitmap,cliprect);
return 0;
}