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AmigActive 10
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AACD 10.iso
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vidhrdw
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tagteam.c
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C/C++ Source or Header
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2000-04-23
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4KB
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207 lines
/***************************************************************************
vidhrdw.c
Functions to emulate the video hardware of the machine.
***************************************************************************/
#include "driver.h"
#include "vidhrdw/generic.h"
static int flipscreen = 0;
static int palettebank;
void tagteam_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;
/* red component */
bit0 = (*color_prom >> 0) & 0x01;
bit1 = (*color_prom >> 1) & 0x01;
bit2 = (*color_prom >> 2) & 0x01;
*(palette++) = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
/* green component */
bit0 = (*color_prom >> 3) & 0x01;
bit1 = (*color_prom >> 4) & 0x01;
bit2 = (*color_prom >> 5) & 0x01;
*(palette++) = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
/* blue component */
bit0 = 0;
bit1 = (*color_prom >> 6) & 0x01;
bit2 = (*color_prom >> 7) & 0x01;
*(palette++) = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
color_prom++;
}
}
READ_HANDLER( tagteam_mirrorvideoram_r )
{
int x,y;
/* swap x and y coordinates */
x = offset / 32;
y = offset % 32;
offset = 32 * y + x;
return videoram_r(offset);
}
READ_HANDLER( tagteam_mirrorcolorram_r )
{
int x,y;
/* swap x and y coordinates */
x = offset / 32;
y = offset % 32;
offset = 32 * y + x;
return colorram_r(offset);
}
WRITE_HANDLER( tagteam_mirrorvideoram_w )
{
int x,y;
/* swap x and y coordinates */
x = offset / 32;
y = offset % 32;
offset = 32 * y + x;
videoram_w(offset,data);
}
WRITE_HANDLER( tagteam_mirrorcolorram_w )
{
int x,y;
/* swap x and y coordinates */
x = offset / 32;
y = offset % 32;
offset = 32 * y + x;
colorram_w(offset,data);
}
WRITE_HANDLER( tagteam_control_w )
{
logerror("%04x: control = %02x\n",cpu_get_pc(),data);
/* bit 7 is the palette bank */
palettebank = (data & 0x80) >> 7;
}
/***************************************************************************
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.
***************************************************************************/
static void drawchars(struct osd_bitmap *bitmap,int color)
{
int offs;
/* for every character in the Video RAM, check if it has been modified */
/* since last time and update it accordingly. If the background is on, */
/* draw characters as sprites */
for (offs = videoram_size - 1;offs >= 0;offs--)
{
int sx,sy;
if (dirtybuffer[offs])
{
dirtybuffer[offs] = 0;
sx = 31 - offs % 32;
sy = offs / 32;
if (flipscreen)
{
sx = 31 - sx;
sy = 31 - sy;
}
/*Someday when the proms are properly figured out, we can remove
the color hack*/
drawgfx(tmpbitmap,Machine->gfx[0],
videoram[offs] + 256 * colorram[offs],
2*color, /* guess */
flipscreen,flipscreen,
8*sx,8*sy,
&Machine->drv->visible_area,TRANSPARENCY_NONE,0);
}
}
/* copy the temporary bitmap to the screen */
copybitmap(bitmap,tmpbitmap,0,0,0,0,&Machine->drv->visible_area,TRANSPARENCY_NONE,0);
}
static void drawsprites(struct osd_bitmap *bitmap,int color)
{
int offs;
/* Draw the sprites */
for (offs = 0;offs < 0x20;offs += 4)
{
int sx,sy,flipx,flipy;
int spritebank;
if (!(videoram[offs + 0] & 0x01)) continue;
sx = 240 - videoram[offs + 3];
sy = 240 - videoram[offs + 2];
flipx = videoram[offs + 0] & 0x04;
flipy = videoram[offs + 0] & 0x02;
spritebank = (videoram[offs] & 0x30) << 4;
if (flipscreen)
{
sx = 240 - sx;
sy = 240 - sy;
flipx = !flipx;
flipy = !flipy;
}
drawgfx(bitmap,Machine->gfx[1],
videoram[offs + 1] + 256 * spritebank,
1+2*color, /* guess */
flipx,flipy,
sx,sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
sy += (flipscreen ? -256 : 256);
// Wrap around
drawgfx(bitmap,Machine->gfx[1],
videoram[offs + 0x20] + 256 * spritebank,
color,
flipx,flipy,
sx,sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
}
void tagteam_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
drawchars(bitmap,palettebank);
drawsprites(bitmap,palettebank);
}