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Fixed Voodoo3 issue found with Diablo II game (#349).

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If front and back buffer addresses are identical, 'video_changed' flag must be set.
This commit is contained in:
Volker Ruppert 2024-09-11 16:29:40 +02:00
parent f5e3dd9dce
commit bfebb17b9d
1 changed files with 3 additions and 2 deletions
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5
bochs/iodev/display/voodoo_func.h
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@ -2471,7 +2471,6 @@ Bit32u lfb_w(Bit32u offset, Bit32u data, Bit32u mem_mask)
{
Bit16u *dest, *depth;
Bit32u destmax, depthmax;
Bit32u forcefront=0;
int sr[2], sg[2], sb[2], sa[2], sw[2];
int x, y, scry, mask;
@ -2679,7 +2678,7 @@ Bit32u lfb_w(Bit32u offset, Bit32u data, Bit32u mem_mask)
mask &= ~(0xf0 + LFB_DEPTH_PRESENT_MSW);
/* select the target buffer */
destbuf = (v->type >= VOODOO_BANSHEE) ? (!forcefront) : LFBMODE_WRITE_BUFFER_SELECT(v->reg[lfbMode].u);
destbuf = (v->type >= VOODOO_BANSHEE) ? 1 : LFBMODE_WRITE_BUFFER_SELECT(v->reg[lfbMode].u);
switch (destbuf)
{
case 0: /* front buffer */
@ -2691,6 +2690,8 @@ Bit32u lfb_w(Bit32u offset, Bit32u data, Bit32u mem_mask)
case 1: /* back buffer */
dest = (Bit16u *)(v->fbi.ram + v->fbi.rgboffs[v->fbi.backbuf]);
destmax = (v->fbi.mask + 1 - v->fbi.rgboffs[v->fbi.backbuf]) / 2;
if (v->fbi.rgboffs[v->fbi.frontbuf] == v->fbi.rgboffs[v->fbi.backbuf])
v->fbi.video_changed = 1;
break;
default: /* reserved */