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AmigActive 10
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AACD 10.iso
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vidhrdw
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exctsccr.c
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C/C++ Source or Header
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2000-04-04
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6KB
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253 lines
/***************************************************************************
vidhrdw.c
Functions to emulate the video hardware of the machine.
***************************************************************************/
#include "driver.h"
#include "vidhrdw/generic.h"
static int gfx_bank;
WRITE_HANDLER( exctsccr_gfx_bank_w ) {
gfx_bank = data & 1;
}
void *exctsccr_fm_timer;
static void exctsccr_fm_callback( int param ) {
cpu_cause_interrupt( 1, 0xff );
}
int exctsccr_vh_start( void ) {
exctsccr_fm_timer = timer_pulse( TIME_IN_HZ( 75.0 ), 0, exctsccr_fm_callback ); /* updates fm */
return generic_vh_start();
}
void exctsccr_vh_stop( void ) {
if ( exctsccr_fm_timer ) {
timer_remove( exctsccr_fm_timer );
exctsccr_fm_timer = 0;
}
generic_vh_stop();
}
/***************************************************************************
Convert the color PROMs into a more useable format.
***************************************************************************/
void exctsccr_vh_convert_color_prom(unsigned char *palette, unsigned short *colortable,const unsigned char *color_prom)
{
int i,idx;
#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;
bit0 = (color_prom[i] >> 0) & 0x01;
bit1 = (color_prom[i] >> 1) & 0x01;
bit2 = (color_prom[i] >> 2) & 0x01;
palette[3*i] = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
bit0 = (color_prom[i] >> 3) & 0x01;
bit1 = (color_prom[i] >> 4) & 0x01;
bit2 = (color_prom[i] >> 5) & 0x01;
palette[3*i + 1] = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
bit0 = 0;
bit1 = (color_prom[i] >> 6) & 0x01;
bit2 = (color_prom[i] >> 7) & 0x01;
palette[3*i + 2] = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
}
color_prom += Machine->drv->total_colors;
/* characters */
idx = 0;
for (i = 0;i < 32;i++)
{
COLOR(0,idx++) = color_prom[256+0+(i*4)];
COLOR(0,idx++) = color_prom[256+1+(i*4)];
COLOR(0,idx++) = color_prom[256+2+(i*4)];
COLOR(0,idx++) = color_prom[256+3+(i*4)];
COLOR(0,idx++) = color_prom[256+128+0+(i*4)];
COLOR(0,idx++) = color_prom[256+128+1+(i*4)];
COLOR(0,idx++) = color_prom[256+128+2+(i*4)];
COLOR(0,idx++) = color_prom[256+128+3+(i*4)];
}
/* sprites */
idx=0;
for (i = 0;i < 15*16;i++)
{
if ( (i%16) < 8 )
{
COLOR(2,idx) = color_prom[i]+16;
idx++;
}
}
for (i = 15*16;i < 16*16;i++)
{
if ( (i%16) > 7 )
{
COLOR(2,idx) = color_prom[i]+16;
idx++;
}
}
for (i = 16;i < 32;i++)
{
COLOR(2,idx++) = color_prom[256+0+(i*4)]+16;
COLOR(2,idx++) = color_prom[256+1+(i*4)]+16;
COLOR(2,idx++) = color_prom[256+2+(i*4)]+16;
COLOR(2,idx++) = color_prom[256+3+(i*4)]+16;
COLOR(2,idx++) = color_prom[256+128+0+(i*4)]+16;
COLOR(2,idx++) = color_prom[256+128+1+(i*4)]+16;
COLOR(2,idx++) = color_prom[256+128+2+(i*4)]+16;
COLOR(2,idx++) = color_prom[256+128+3+(i*4)]+16;
}
/* Patch for goalkeeper */
COLOR(2,29*8+7) = 16;
}
static void exctsccr_drawsprites( struct osd_bitmap *bitmap ) {
int offs;
unsigned char *OBJ1, *OBJ2;
OBJ1 = videoram;
OBJ2 = &(spriteram[0x20]);
for ( offs = 0x0e; offs >= 0; offs -= 2 ) {
int sx,sy,code,bank,flipx,flipy,color;
sx = 256 - OBJ2[offs+1];
sy = OBJ2[offs] - 16;
code = ( OBJ1[offs] >> 2 ) & 0x3f;
flipx = ( OBJ1[offs] ) & 0x01;
flipy = ( OBJ1[offs] ) & 0x02;
color = ( OBJ1[offs+1] ) & 0x1f;
bank = 2;
bank += ( ( OBJ1[offs+1] >> 4 ) & 1 );
drawgfx(bitmap,Machine->gfx[bank],
code,
color,
flipx, flipy,
sx,sy,
&Machine->drv->visible_area,
TRANSPARENCY_PEN,0);
}
OBJ1 = &(memory_region(REGION_CPU1)[0x8800]);
OBJ2 = spriteram;
for ( offs = 0x0e; offs >= 0; offs -= 2 ) {
int sx,sy,code,bank,flipx,flipy,color;
sx = 256 - OBJ2[offs+1];
sy = OBJ2[offs] - 16;
code = ( OBJ1[offs] >> 2 ) & 0x3f;
flipx = ( OBJ1[offs] ) & 0x01;
flipy = ( OBJ1[offs] ) & 0x02;
color = ( OBJ1[offs+1] ) & 0x1f;
bank = 3;
if ( color == 0 )
continue;
if ( color < 0x10 )
bank++;
if ( color > 0x10 && color < 0x17 )
{
drawgfx(bitmap,Machine->gfx[4],
code,
0x0e,
flipx, flipy,
sx,sy,
&Machine->drv->visible_area,
TRANSPARENCY_PEN,0);
color += 6;
}
if ( color==0x1d && gfx_bank==1 )
{
drawgfx(bitmap,Machine->gfx[3],
code,
color,
flipx, flipy,
sx,sy,
&Machine->drv->visible_area,
TRANSPARENCY_PEN,0);
drawgfx(bitmap,Machine->gfx[4],
code,
color,
flipx, flipy,
sx,sy,
&Machine->drv->visible_area,
TRANSPARENCY_COLOR, 16);
} else
{
drawgfx(bitmap,Machine->gfx[bank],
code,
color,
flipx, flipy,
sx,sy,
&Machine->drv->visible_area,
TRANSPARENCY_PEN,0);
}
}
}
/***************************************************************************
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 exctsccr_vh_screenrefresh( struct osd_bitmap *bitmap, int full_refresh ) {
int offs;
/* background chars */
for (offs = 0;offs < ( videoram_size - 0x10 );offs++) {
if ( dirtybuffer[offs] ) {
int sx,sy,code;
dirtybuffer[offs] = 0;
sx = 8 * (offs % 32);
sy = 8 * (offs / 32);
code = videoram[offs];
drawgfx(tmpbitmap,Machine->gfx[gfx_bank],
code,
( colorram[offs] ) & 0x1f,
0, 0,
sx,sy,
&Machine->drv->visible_area,
TRANSPARENCY_NONE,0);
}
}
/* copy the character mapped graphics */
copybitmap(bitmap,tmpbitmap,0,0,0,0,&Machine->drv->visible_area,TRANSPARENCY_NONE,0);
/* draw sprites */
exctsccr_drawsprites( bitmap );
}