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exprraid.c
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C/C++ Source or Header
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2000-01-12
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4KB
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153 lines
#include "driver.h"
#include "vidhrdw/generic.h"
unsigned char *exprraid_bgcontrol;
void exprraid_vh_convert_color_prom(unsigned char *palette, unsigned short *colortable,const unsigned char *color_prom)
{
int i;
#define TOTAL_COLORS(gfxn) (Machine->gfx[gfxn]->total_colors * Machine->gfx[gfxn]->color_granularity)
#define COLOR(gfxn,offs) (colortable[Machine->drv->gfxdecodeinfo[gfxn].color_codes_start + offs])
for (i = 0;i < Machine->drv->total_colors;i++)
{
int bit0,bit1,bit2,bit3;
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;
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;
bit0 = (color_prom[2*Machine->drv->total_colors] >> 0) & 0x01;
bit1 = (color_prom[2*Machine->drv->total_colors] >> 1) & 0x01;
bit2 = (color_prom[2*Machine->drv->total_colors] >> 2) & 0x01;
bit3 = (color_prom[2*Machine->drv->total_colors] >> 3) & 0x01;
*(palette++) = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3;
color_prom++;
}
}
static void drawbg(struct osd_bitmap *bitmap,int priority)
{
unsigned char *map1 = &memory_region(REGION_GFX4)[0x0000];
unsigned char *map2 = &memory_region(REGION_GFX4)[0x4000];
int offs,scrolly,scrollx1,scrollx2;
scrolly = exprraid_bgcontrol[4];
/* TODO: bgcontrol[7] seems related to the y scroll as well, but I'm not sure how */
scrollx1 = exprraid_bgcontrol[5];
scrollx2 = exprraid_bgcontrol[6];
for (offs = 0x100 - 1;offs >= 0;offs--)
{
int sx,sy,quadrant,base,bank;
sx = 16 * (offs % 16);
sy = 16 * (offs / 16) - scrolly;
quadrant = 0;
if (sy <= -8)
{
quadrant += 2;
sy += 256;
sx -= scrollx2;
}
else
sx -= scrollx1;
if (sx <= -8)
{
quadrant++;
sx += 256;
}
base = (exprraid_bgcontrol[quadrant] & 0x3f) * 0x100;
if (priority == 0 || (map2[offs+base] & 0x80))
{
bank = 2*(map2[offs+base] & 0x03)+((map1[offs+base] & 0x80) >> 7);
drawgfx(bitmap,Machine->gfx[2+bank],
map1[offs+base] & 0x7f,
(map2[offs+base] & 0x18) >> 3,
(map2[offs+base] & 0x04),0,
sx,sy,
&Machine->drv->visible_area,TRANSPARENCY_NONE,0);
}
}
}
void exprraid_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
int offs;
/* draw the background */
drawbg(bitmap,0);
/* draw the sprites */
for (offs = 0;offs < spriteram_size;offs += 4)
{
int sx,sy,code,color,flipx;
code = spriteram[offs+3] + ( ( spriteram[offs+1] & 0xe0 ) << 3 );
sx = ((248 - spriteram[offs+2]) & 0xff) - 8;
sy = spriteram[offs];
color = (spriteram[offs+1] & 0x03) + ((spriteram[offs+1] & 0x08) >> 1);
flipx = ( spriteram[offs+1] & 0x04 );
drawgfx(bitmap,Machine->gfx[1],
code,
color,
flipx,0,
sx,sy,
0,TRANSPARENCY_PEN,0);
if ( spriteram[offs+1] & 0x10 ) { /* double height */
drawgfx(bitmap,Machine->gfx[1],
code + 1,
color,
flipx,0,
sx,sy+16,
0,TRANSPARENCY_PEN,0);
}
}
/* redraw the tiles which have priority over the sprites */
drawbg(bitmap,1);
/* draw the foreground */
for (offs = videoram_size - 1;offs >= 0;offs--)
{
int sx,sy;
sx = offs % 32;
sy = offs / 32;
drawgfx(bitmap,Machine->gfx[0],
videoram[offs] + ((colorram[offs] & 7) << 8),
(colorram[offs] & 0x10) >> 4,
0,0,
8*sx,8*sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
}