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AmigActive 10
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AACD 10.iso
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MAME
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vidhrdw
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tail2nos.c
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C/C++ Source or Header
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2000-04-12
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6KB
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249 lines
#include "driver.h"
#include "vidhrdw/generic.h"
#include "konamiic.h"
unsigned char *tail2nos_bgvideoram;
static struct tilemap *bg_tilemap;
static int charbank,charpalette,video_enable;
static unsigned char *zoomdata;
static int dirtygfx;
static unsigned char *dirtychar;
#define TOTAL_CHARS 0x400
/***************************************************************************
Callbacks for the TileMap code
***************************************************************************/
static void get_tile_info(int tile_index)
{
UINT16 code = READ_WORD(&tail2nos_bgvideoram[2*tile_index]);
SET_TILE_INFO(0,(code & 0x1fff) + (charbank << 13),((code & 0xe000) >> 13) + charpalette * 16)
}
/***************************************************************************
Callbacks for the K051316
***************************************************************************/
static void zoom_callback(int *code,int *color)
{
*code |= ((*color & 0x03) << 8);
*color = 32 + ((*color & 0x38) >> 3);
}
/***************************************************************************
Start the video hardware emulation.
***************************************************************************/
int tail2nos_vh_start(void)
{
bg_tilemap = tilemap_create(get_tile_info,tilemap_scan_rows,TILEMAP_TRANSPARENT,8,8,64,32);
if (!bg_tilemap)
return 1;
if (K051316_vh_start_0(REGION_GFX3,4,zoom_callback))
return 1;
if (!(dirtychar = malloc(TOTAL_CHARS)))
{
K051316_vh_stop_0();
return 1;
}
memset(dirtychar,1,TOTAL_CHARS);
bg_tilemap->transparent_pen = 15;
K051316_wraparound_enable(0,1);
K051316_set_offset(0,-89,-14);
zoomdata = memory_region(REGION_GFX3);
return 0;
}
void tail2nos_vh_stop(void)
{
K051316_vh_stop_0();
free(dirtychar);
dirtychar = 0;
}
/***************************************************************************
Memory handlers
***************************************************************************/
READ_HANDLER( tail2nos_bgvideoram_r )
{
return READ_WORD(&tail2nos_bgvideoram[offset]);
}
WRITE_HANDLER( tail2nos_bgvideoram_w )
{
int oldword = READ_WORD(&tail2nos_bgvideoram[offset]);
int newword = COMBINE_WORD(oldword,data);
if (oldword != newword)
{
WRITE_WORD(&tail2nos_bgvideoram[offset],newword);
tilemap_mark_tile_dirty(bg_tilemap,offset/2);
}
}
READ_HANDLER( tail2nos_zoomdata_r )
{
return READ_WORD(&zoomdata[offset]);
}
WRITE_HANDLER( tail2nos_zoomdata_w )
{
int oldword = READ_WORD(&zoomdata[offset]);
int newword = COMBINE_WORD(oldword,data);
if (oldword != newword)
{
dirtygfx = 1;
dirtychar[offset / 128] = 1;
WRITE_WORD(&zoomdata[offset],newword);
}
}
WRITE_HANDLER( tail2nos_gfxbank_w )
{
if ((data & 0x00ff0000) == 0)
{
int bank;
/* bits 0 and 2 select char bank */
if (data & 0x04) bank = 2;
else if (data & 0x01) bank = 1;
else bank = 0;
if (charbank != bank)
{
charbank = bank;
tilemap_mark_all_tiles_dirty(bg_tilemap);
}
/* bit 5 seems to select palette bank (used on startup) */
if (data & 0x20) bank = 7;
else bank = 3;
if (charpalette != bank)
{
charpalette = bank;
tilemap_mark_all_tiles_dirty(bg_tilemap);
}
/* bit 4 seems to be video enable */
video_enable = data & 0x10;
}
}
/***************************************************************************
Display Refresh
***************************************************************************/
static void drawsprites(struct osd_bitmap *bitmap)
{
int offs;
for (offs = 0;offs < spriteram_size;offs += 8)
{
int sx,sy,flipx,flipy,code,color;
sx = READ_WORD(&spriteram[offs + 2]);
if (sx >= 0x8000) sx -= 0x10000;
sy = 0x10000 - READ_WORD(&spriteram[offs + 0]);
if (sy >= 0x8000) sy -= 0x10000;
code = READ_WORD(&spriteram[offs + 4]) & 0x07ff;
color = (READ_WORD(&spriteram[offs + 4]) & 0xe000) >> 13;
flipx = READ_WORD(&spriteram[offs + 4]) & 0x1000;
flipy = READ_WORD(&spriteram[offs + 4]) & 0x0800;
drawgfx(bitmap,Machine->gfx[1],
code,
40 + color,
flipx,flipy,
sx+3,sy+1, /* placement relative to zoom layer verified on the real thing */
&Machine->drv->visible_area,TRANSPARENCY_PEN,15);
}
}
void tail2nos_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
static struct GfxLayout tilelayout =
{
16,16,
TOTAL_CHARS,
4,
{ 0, 1, 2, 3 },
#ifdef LSB_FIRST
{ 2*4, 3*4, 0*4, 1*4, 6*4, 7*4, 4*4, 5*4,
10*4, 11*4, 8*4, 9*4, 14*4, 15*4, 12*4, 13*4 },
#else
{ 0*4, 1*4, 2*4, 3*4, 4*4, 5*4, 6*4, 7*4,
8*4, 9*4, 10*4, 11*4, 12*4, 13*4, 14*4, 15*4 },
#endif
{ 0*64, 1*64, 2*64, 3*64, 4*64, 5*64, 6*64, 7*64,
8*64, 9*64, 10*64, 11*64, 12*64, 13*64, 14*64, 15*64 },
128*8
};
if (dirtygfx)
{
int i;
dirtygfx = 0;
for (i = 0;i < TOTAL_CHARS;i++)
{
if (dirtychar[i])
{
dirtychar[i] = 0;
decodechar(Machine->gfx[2],i,zoomdata,&tilelayout);
}
}
tilemap_mark_all_tiles_dirty(ALL_TILEMAPS);
}
K051316_tilemap_update_0();
tilemap_update(bg_tilemap);
if (palette_recalc())
tilemap_mark_all_pixels_dirty(ALL_TILEMAPS);
tilemap_render(ALL_TILEMAPS);
if (video_enable)
{
K051316_zoom_draw_0(bitmap,0);
drawsprites(bitmap);
tilemap_draw(bitmap,bg_tilemap,0);
}
else
fillbitmap(bitmap,Machine->pens[0],&Machine->drv->visible_area);
}