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AmigActive 10
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vidhrdw
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sidepckt.c
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C/C++ Source or Header
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2000-04-04
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4KB
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161 lines
#include "driver.h"
#include "vidhrdw/generic.h"
static struct tilemap *bg_tilemap;
static int flipscreen;
void sidepckt_vh_convert_color_prom(unsigned char *palette, unsigned short *colortable,const unsigned char *color_prom)
{
int i;
for (i = 0;i < Machine->drv->total_colors;i++)
{
int bit0,bit1,bit2,bit3;
/* red component */
bit0 = (color_prom[0] >> 4) & 0x01;
bit1 = (color_prom[0] >> 5) & 0x01;
bit2 = (color_prom[0] >> 6) & 0x01;
bit3 = (color_prom[0] >> 7) & 0x01;
*(palette++) = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3;
/* green component */
bit0 = (color_prom[0] >> 0) & 0x01;
bit1 = (color_prom[0] >> 1) & 0x01;
bit2 = (color_prom[0] >> 2) & 0x01;
bit3 = (color_prom[0] >> 3) & 0x01;
*(palette++) = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3;
/* blue component */
bit0 = (color_prom[Machine->drv->total_colors] >> 0) & 0x01;
bit1 = (color_prom[Machine->drv->total_colors] >> 1) & 0x01;
bit2 = (color_prom[Machine->drv->total_colors] >> 2) & 0x01;
bit3 = (color_prom[Machine->drv->total_colors] >> 3) & 0x01;
*(palette++) = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3;
color_prom++;
}
}
/***************************************************************************
Callbacks for the TileMap code
***************************************************************************/
static void get_tile_info(int tile_index)
{
unsigned char attr = colorram[tile_index];
SET_TILE_INFO(0,videoram[tile_index] + ((attr & 0x07) << 8),
((attr & 0x10) >> 3) | ((attr & 0x20) >> 5))
tile_info.flags = TILE_FLIPX | TILE_SPLIT((attr & 0x80) >> 7);
}
/***************************************************************************
Start the video hardware emulation.
***************************************************************************/
int sidepckt_vh_start(void)
{
bg_tilemap = tilemap_create(get_tile_info,tilemap_scan_rows,TILEMAP_SPLIT,8,8,32,32);
if (!bg_tilemap)
return 1;
bg_tilemap->transmask[0] = 0xff; /* split type 0 is totally transparent in front half */
bg_tilemap->transmask[1] = 0x01; /* split type 1 has pen 1 transparent in front half */
tilemap_set_flip(ALL_TILEMAPS,TILEMAP_FLIPX);
return 0;
}
/***************************************************************************
Memory handlers
***************************************************************************/
WRITE_HANDLER( sidepckt_videoram_w )
{
if (videoram[offset] != data)
{
videoram[offset] = data;
tilemap_mark_tile_dirty(bg_tilemap,offset);
}
}
WRITE_HANDLER( sidepckt_colorram_w )
{
if (colorram[offset] != data)
{
colorram[offset] = data;
tilemap_mark_tile_dirty(bg_tilemap,offset);
}
}
WRITE_HANDLER( sidepckt_flipscreen_w )
{
flipscreen = data;
tilemap_set_flip(ALL_TILEMAPS,flipscreen ? TILEMAP_FLIPY : TILEMAP_FLIPX);
}
/***************************************************************************
Display refresh
***************************************************************************/
static void draw_sprites(struct osd_bitmap *bitmap)
{
int offs;
for (offs = 0;offs < spriteram_size; offs += 4)
{
int sx,sy,code,color,flipx,flipy;
code = spriteram[offs+3] + ((spriteram[offs+1] & 0x03) << 8);
color = (spriteram[offs+1] & 0xf0) >> 4;
sx = spriteram[offs+2]-2;
sy = spriteram[offs];
flipx = spriteram[offs+1] & 0x08;
flipy = spriteram[offs+1] & 0x04;
drawgfx(bitmap,Machine->gfx[1],
code,
color,
flipx,flipy,
sx,sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
/* wraparound */
drawgfx(bitmap,Machine->gfx[1],
code,
color,
flipx,flipy,
sx-256,sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
}
void sidepckt_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
tilemap_update(ALL_TILEMAPS);
tilemap_render(ALL_TILEMAPS);
tilemap_draw(bitmap,bg_tilemap,TILEMAP_BACK);
draw_sprites(bitmap);
tilemap_draw(bitmap,bg_tilemap,TILEMAP_FRONT);
}