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AmigActive 10
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AACD 10.iso
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vidhrdw
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cop01.c
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C/C++ Source or Header
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2000-05-04
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6KB
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239 lines
/***************************************************************************
vidhrdw.c
Functions to emulate the video hardware of the machine.
***************************************************************************/
#include "driver.h"
#include "vidhrdw/generic.h"
unsigned char *cop01_videoram;
size_t cop01_videoram_size;
static unsigned char cop01_scrollx[1];
static unsigned char spritebank = 0;
static int flipscreen;
static struct osd_bitmap *tmpbitmap2;
void cop01_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++;
}
color_prom += 2*Machine->drv->total_colors;
/* color_prom now points to the beginning of the lookup tables */
/* characters use colors 0-15 */
for (i = 0;i < TOTAL_COLORS(0);i++)
COLOR(0,i) = (*(color_prom++) & 0x0f); /* ?? */
/* background tiles use colors 192-255 */
for (i = 0;i < TOTAL_COLORS(1);i++)
COLOR(1,i) = i + 192;
/* sprites use colors 128-143 */
for (i = 0;i < TOTAL_COLORS(2);i++)
COLOR(2,i) = (*(color_prom++) & 0x0f) + 128;
}
/***************************************************************************
Start the video hardware emulation.
***************************************************************************/
int cop01_vh_start(void)
{
if (generic_vh_start() != 0)
return 1;
if ((tmpbitmap2 = osd_create_bitmap(2*Machine->drv->screen_width,Machine->drv->screen_height)) == 0)
{
generic_vh_stop();
return 1;
}
return 0;
}
/***************************************************************************
Stop the video hardware emulation.
***************************************************************************/
void cop01_vh_stop(void)
{
osd_free_bitmap(tmpbitmap2);
generic_vh_stop();
}
WRITE_HANDLER( cop01_scrollx_w )
{
cop01_scrollx[offset] = data;
}
WRITE_HANDLER( cop01_gfxbank_w )
{
/* bits 0 and 1 coin counters */
coin_counter_w(0,data & 1);
coin_counter_w(1,data & 2);
/* bit 2 flip screen */
if (flipscreen != (data & 0x04))
{
flipscreen = data & 0x04;
memset(dirtybuffer,1,videoram_size);
}
/* bits 4 and 5 select sprite bank */
spritebank = (data & 0x30) >> 4;
logerror("gfxbank = %02x\n",data);
}
/***************************************************************************
Draw the game screen in the given osd_bitmap.
Do NOT call osd_update_display() from this function, it will be called by
the main emulation engine.
***************************************************************************/
void cop01_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
int offs;
/* draw the background */
for (offs = videoram_size - 1;offs >= 0;offs--)
{
if (dirtybuffer[offs])
{
int sx,sy;
dirtybuffer[offs] = 0;
sx = offs % 64;
sy = offs / 64;
if (flipscreen)
{
sx = 63 - sx;
sy = 31 - sy;
}
drawgfx(tmpbitmap2,Machine->gfx[1],
videoram[offs] + ((colorram[offs] & 0x03) << 8),
(colorram[offs] & 0x0c) >> 2,
flipscreen,flipscreen,
8*sx,8*sy,
0,TRANSPARENCY_NONE,0);
}
}
/* copy the background graphics */
{
int scrollx;
if (flipscreen)
scrollx = (cop01_scrollx[0] + 256 * cop01_scrollx[1]) - 256;
else
scrollx = -(cop01_scrollx[0] + 256 * cop01_scrollx[1]);
copyscrollbitmap(bitmap,tmpbitmap2,1,&scrollx,0,0,&Machine->drv->visible_area,TRANSPARENCY_NONE,0);
}
/* draw the sprites */
for (offs = 0;offs < spriteram_size;offs += 4)
{
int attr = spriteram[offs+2];
int numtile = spriteram[offs+1];
int flipx = attr & 4;
int sx,sy;
if (numtile & 0x80) /* high tiles are bankswitched */
{
if (spritebank & 1) numtile += 128;
else if (spritebank & 2) numtile += 256;
}
sy = 240 - spriteram[offs];
sx = (spriteram[offs+3] - 0x80) + 256 * (attr & 1);
if (flipscreen)
{
sx = 240 - sx;
sy = 240 - sy;
flipx = !flipx;
}
drawgfx(bitmap,Machine->gfx[2],
numtile,
(attr & 0xf0) >> 4,
flipx,flipscreen,
sx,sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
/* draw the foreground characters */
for (offs = cop01_videoram_size - 1;offs >= 0;offs--)
{
int sx,sy;
sx = offs % 32;
sy = offs / 32;
if (flipscreen)
{
sx = 31 - sx;
sy = 31 - sy;
}
drawgfx(bitmap,Machine->gfx[0],
cop01_videoram[offs],
0, /* is there a color selector missing? */
flipscreen,flipscreen,
8*sx,8*sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,15);
}
}