67 lines
1.9 KiB
C
67 lines
1.9 KiB
C
/* Copyright holders: Sarah Walker
|
|
see COPYING for more details
|
|
*/
|
|
/*Trident TKD8001 RAMDAC emulation*/
|
|
#include <stdio.h>
|
|
#include <stdint.h>
|
|
#include <string.h>
|
|
#include <wchar.h>
|
|
#include "../ibm.h"
|
|
#include "../mem.h"
|
|
#include "video.h"
|
|
#include "vid_svga.h"
|
|
#include "vid_tkd8001_ramdac.h"
|
|
|
|
|
|
void tkd8001_ramdac_out(uint16_t addr, uint8_t val, tkd8001_ramdac_t *ramdac, svga_t *svga)
|
|
{
|
|
switch (addr)
|
|
{
|
|
case 0x3C6:
|
|
if (ramdac->state == 4)
|
|
{
|
|
ramdac->state = 0;
|
|
ramdac->ctrl = val;
|
|
switch (val >> 5)
|
|
{
|
|
case 0: case 1: case 2: case 3:
|
|
svga->bpp = 8;
|
|
break;
|
|
case 5:
|
|
svga->bpp = 15;
|
|
break;
|
|
case 6:
|
|
svga->bpp = 24;
|
|
break;
|
|
case 7:
|
|
svga->bpp = 16;
|
|
break;
|
|
}
|
|
return;
|
|
}
|
|
break;
|
|
case 0x3C7: case 0x3C8: case 0x3C9:
|
|
ramdac->state = 0;
|
|
break;
|
|
}
|
|
svga_out(addr, val, svga);
|
|
}
|
|
|
|
uint8_t tkd8001_ramdac_in(uint16_t addr, tkd8001_ramdac_t *ramdac, svga_t *svga)
|
|
{
|
|
switch (addr)
|
|
{
|
|
case 0x3C6:
|
|
if (ramdac->state == 4)
|
|
{
|
|
return ramdac->ctrl;
|
|
}
|
|
ramdac->state++;
|
|
break;
|
|
case 0x3C7: case 0x3C8: case 0x3C9:
|
|
ramdac->state = 0;
|
|
break;
|
|
}
|
|
return svga_in(addr, svga);
|
|
}
|