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AmigActive 10
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vidhrdw
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stadhero.c
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C/C++ Source or Header
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2000-04-04
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8KB
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323 lines
/***************************************************************************
stadhero video emulation - Bryan McPhail, mish@tendril.co.uk
*********************************************************************
MXC-06 chip to produce sprites, see dec0.c
BAC-06 chip for background?
***************************************************************************/
#include "driver.h"
#include "vidhrdw/generic.h"
unsigned char *stadhero_pf1_data,*stadhero_pf2_data;
static unsigned char *stadhero_pf2_dirty;
static struct osd_bitmap *stadhero_pf2_bitmap;
static unsigned char stadhero_pf2_control_0[8];
static unsigned char stadhero_pf2_control_1[8];
/******************************************************************************/
static void stadhero_drawsprites(struct osd_bitmap *bitmap,int pri_mask,int pri_val)
{
int offs;
for (offs = 0;offs < 0x800;offs += 8)
{
int x,y,sprite,colour,multi,fx,fy,inc,flash;
y = READ_WORD(&spriteram[offs]);
if ((y&0x8000) == 0) continue;
x = READ_WORD(&spriteram[offs+4]);
colour = x >> 12;
if ((colour & pri_mask) != pri_val) continue;
flash=x&0x800;
if (flash && (cpu_getcurrentframe() & 1)) continue;
fx = y & 0x2000;
fy = y & 0x4000;
multi = (1 << ((y & 0x1800) >> 11)) - 1; /* 1x, 2x, 4x, 8x height */
/* multi = 0 1 3 7 */
sprite = READ_WORD (&spriteram[offs+2]) & 0x0fff;
x = x & 0x01ff;
y = y & 0x01ff;
if (x >= 256) x -= 512;
if (y >= 256) y -= 512;
x = 240 - x;
y = 240 - y;
if (x>256) continue; /* Speedup */
sprite &= ~multi;
if (fy)
inc = -1;
else
{
sprite += multi;
inc = 1;
}
while (multi >= 0)
{
drawgfx(bitmap,Machine->gfx[2],
sprite - multi * inc,
colour,
fx,fy,
x,y - 16 * multi,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
multi--;
}
}
}
/******************************************************************************/
static void stadhero_pf2_update(void)
{
int offs,mx,my,color,tile,quarter;
int offsetx[16],offsety[16];
offsetx[0]=0; offsety[0]=0;
offsetx[1]=0; offsety[1]=256;
offsetx[2]=0; offsety[2]=512;
offsetx[3]=0; offsety[3]=768;
offsetx[4]=256; offsety[4]=0;
offsetx[5]=256; offsety[5]=256;
offsetx[6]=256; offsety[6]=512;
offsetx[7]=256; offsety[7]=768;
offsetx[8]=512; offsety[8]=0;
offsetx[9]=512; offsety[9]=256;
offsetx[10]=512; offsety[10]=512;
offsetx[11]=512; offsety[11]=768;
offsetx[12]=768; offsety[12]=0;
offsetx[13]=768; offsety[13]=256;
offsetx[14]=768; offsety[14]=512;
offsetx[15]=768; offsety[15]=768;
for (quarter = 0;quarter < 16;quarter++)
{
mx = -1;
my = 0;
for (offs = 0x200 * quarter; offs < 0x200 * quarter + 0x200;offs += 2)
{
mx++;
if (mx == 16)
{
mx = 0;
my++;
}
if (stadhero_pf2_dirty[offs])
{
stadhero_pf2_dirty[offs] = 0;
tile = READ_WORD(&stadhero_pf2_data[offs]);
color = (tile & 0xf000) >> 12;
drawgfx(stadhero_pf2_bitmap,Machine->gfx[1],
tile & 0x0fff,
color,
0,0,
16*mx + offsetx[quarter],16*my + offsety[quarter],
0,TRANSPARENCY_NONE,0);
}
}
}
}
/******************************************************************************/
void stadhero_pf2_draw(struct osd_bitmap *bitmap)
{
int scrolly,scrollx;
scrollx = - READ_WORD(&stadhero_pf2_control_1[0]);
scrolly = - READ_WORD(&stadhero_pf2_control_1[2]);
copyscrollbitmap(bitmap,stadhero_pf2_bitmap,1,&scrollx,1,&scrolly,&Machine->drv->visible_area,TRANSPARENCY_NONE,0);
}
/******************************************************************************/
void stadhero_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
int offs;
int color,code,i;
int colmask[16];
int pal_base;
int mx,my,tile;
palette_init_used_colors();
pal_base = Machine->drv->gfxdecodeinfo[0].color_codes_start;
for (color = 0;color < 16;color++) colmask[color] = 0;
for (offs = 0; offs < 0x800;offs += 2)
{
code = READ_WORD(&stadhero_pf1_data[offs]);
color = (code & 0xf000) >> 12;
code &= 0x0fff;
colmask[color] |= Machine->gfx[0]->pen_usage[code];
}
for (color = 0;color < 16;color++)
{
if (colmask[color] & (1 << 0))
palette_used_colors[pal_base + 8 * color] = PALETTE_COLOR_TRANSPARENT;
for (i = 1;i < 8;i++)
{
if (colmask[color] & (1 << i))
palette_used_colors[pal_base + 8 * color + i] = PALETTE_COLOR_USED;
}
}
pal_base = Machine->drv->gfxdecodeinfo[1].color_codes_start;
for (color = 0;color < 16;color++) colmask[color] = 0;
for (offs = 0; offs < 0x2000;offs += 2)
{
code = READ_WORD(&stadhero_pf2_data[offs]);
color = (code & 0xf000) >> 12;
code &= 0x0fff;
colmask[color] |= Machine->gfx[1]->pen_usage[code];
}
for (color = 0;color < 16;color++)
{
for (i = 0;i < 8;i++)
{
if (colmask[color] & (1 << i))
palette_used_colors[pal_base + 8 * color + i] = PALETTE_COLOR_USED;
}
}
pal_base = Machine->drv->gfxdecodeinfo[2].color_codes_start;
for (color = 0;color < 16;color++) colmask[color] = 0;
for (offs = 0;offs < 0x800;offs += 8)
{
int x,y,sprite,multi;
y = READ_WORD(&spriteram[offs]);
if ((y&0x8000) == 0) continue;
x = READ_WORD(&spriteram[offs+4]);
color = (x & 0xf000) >> 12;
multi = (1 << ((y & 0x1800) >> 11)) - 1; /* 1x, 2x, 4x, 8x height */
/* multi = 0 1 3 7 */
sprite = READ_WORD (&spriteram[offs+2]) & 0x0fff;
sprite &= ~multi;
while (multi >= 0)
{
colmask[color] |= Machine->gfx[2]->pen_usage[sprite + multi];
multi--;
}
}
for (color = 0;color < 16;color++)
{
for (i = 1;i < 16;i++)
{
if (colmask[color] & (1 << i))
palette_used_colors[pal_base + 16 * color + i] = PALETTE_COLOR_USED;
}
}
if (palette_recalc())
{
memset(stadhero_pf2_dirty,1,0x2000);
}
stadhero_pf2_update();
stadhero_pf2_draw(bitmap);
stadhero_drawsprites(bitmap,0x00,0x00);
for (offs = 0x800 - 2;offs >= 0;offs -= 2)
{
tile=READ_WORD(&stadhero_pf1_data[offs]);
if (!tile) continue;
color=tile>>12;
mx = (offs/2) % 32;
my = (offs/2) / 32;
drawgfx(bitmap,Machine->gfx[0],
tile&0xfff,color,0,0,8*mx,8*my,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
}
/******************************************************************************/
WRITE_HANDLER( stadhero_pf1_data_w )
{
COMBINE_WORD_MEM(&stadhero_pf1_data[offset],data);
}
READ_HANDLER( stadhero_pf1_data_r )
{
return READ_WORD(&stadhero_pf1_data[offset]);
}
WRITE_HANDLER( stadhero_pf2_control_0_w )
{
COMBINE_WORD_MEM(&stadhero_pf2_control_0[offset],data);
}
WRITE_HANDLER( stadhero_pf2_control_1_w )
{
COMBINE_WORD_MEM(&stadhero_pf2_control_1[offset],data);
}
WRITE_HANDLER( stadhero_pf2_data_w )
{
int oldword = READ_WORD(&stadhero_pf2_data[offset]);
int newword = COMBINE_WORD(oldword,data);
if (oldword != newword)
{
WRITE_WORD(&stadhero_pf2_data[offset],newword);
stadhero_pf2_dirty[offset] = 1;
}
}
READ_HANDLER( stadhero_pf2_data_r )
{
return READ_WORD(&stadhero_pf2_data[offset]);
}
/******************************************************************************/
void stadhero_vh_stop (void)
{
osd_free_bitmap(stadhero_pf2_bitmap);
free(stadhero_pf2_dirty);
}
int stadhero_vh_start (void)
{
if ((stadhero_pf2_bitmap = osd_create_bitmap(1024,1024)) == 0) {
stadhero_vh_stop ();
return 1;
}
stadhero_pf2_dirty = malloc(0x2000);
memset(stadhero_pf2_dirty,1,0x2000);
return 0;
}
/******************************************************************************/