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Mach64 now disables VGA data processing on LFB writes. Windows 9x DOS boxes now rendered correctly.

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This commit is contained in:
TomW 2013-12-15 14:29:52 +00:00
commit 74793aaf99
3 changed files with 11 additions and 5 deletions
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6
src/vid_ati_mach64.c
View file

@ -630,7 +630,7 @@ void mach64_blit(uint32_t cpu_dat, int count, mach64_t *mach64)
int mix;
int dst_x = mach64->accel.dst_x + mach64->accel.dst_x_start;
int dst_y = mach64->accel.dst_y + mach64->accel.dst_y_start;
if (mach64->accel.source_host)
{
host_dat = cpu_dat;
@ -1291,6 +1291,10 @@ void mach64_ext_writeb(uint32_t addr, uint8_t val, void *p)
case 0x1c: case 0x1d: case 0x1e: case 0x1f:
WRITE8(addr, mach64->crtc_gen_cntl, val);
if (((mach64->crtc_gen_cntl >> 24) & 3) == 3)
svga->fb_only = 1;
else
svga->fb_only = 0;
svga_recalctimings(&mach64->svga);
break;

8
src/vid_svga.c
View file

@ -660,7 +660,7 @@ void svga_write(uint32_t addr, uint8_t val, void *p)
addr += svga->write_bank;
if (!(svga->gdcreg[6] & 1)) svga->fullchange=2;
if (svga->chain4)
if (svga->chain4 || svga->fb_only)
{
writemask2=1<<(addr&3);
addr&=~3;
@ -836,7 +836,7 @@ uint8_t svga_read(uint32_t addr, void *p)
// pclog("%05X %i %04X:%04X %02X %02X %i\n",addr,svga->chain4,CS,pc, vram[addr & 0x7fffff], vram[(addr << 2) & 0x7fffff], svga->readmode);
// pclog("%i\n", svga->readmode);
if (svga->chain4)
if (svga->chain4 || svga->fb_only)
{
addr &= 0x7fffff;
if (addr >= svga->vram_limit)
@ -888,7 +888,7 @@ void svga_write_linear(uint32_t addr, uint8_t val, void *p)
if (svga_output) pclog("Write LFB %08X %02X ", addr, val);
if (!(svga->gdcreg[6] & 1))
svga->fullchange = 2;
if (svga->chain4)
if (svga->chain4 || svga->fb_only)
{
writemask2=1<<(addr&3);
addr&=~3;
@ -1057,7 +1057,7 @@ uint8_t svga_read_linear(uint32_t addr, void *p)
egareads++;
if (svga->chain4)
if (svga->chain4 || svga->fb_only)
{
addr &= 0x7fffff;
if (addr >= svga->vram_limit)

2
src/vid_svga.h
View file

@ -25,6 +25,8 @@ typedef struct svga_t
uint8_t plane_mask;
int fb_only;
int fast;
uint8_t colourcompare, colournocare;
int readmode, writemode, readplane;