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Handle unaligned LFB reads/writes on Banshee/V3. Fixes UI glitches in

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Red Alert 2.
This commit is contained in:
SarahW 2020-11-22 14:28:57 +00:00
commit e518b4312b
1 changed files with 20 additions and 0 deletions
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20
src/vid_voodoo_banshee.c
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@ -1339,6 +1339,9 @@ static uint16_t banshee_read_linear_w(uint32_t addr, void *p)
voodoo_t *voodoo = banshee->voodoo;
svga_t *svga = &banshee->svga;
if (addr & 1)
return banshee_read_linear(addr, p) | (banshee_read_linear(addr+1, p) << 8);
cycles -= voodoo->read_time;
cycles_lost += voodoo->read_time;
@ -1372,6 +1375,9 @@ static uint32_t banshee_read_linear_l(uint32_t addr, void *p)
voodoo_t *voodoo = banshee->voodoo;
svga_t *svga = &banshee->svga;
if (addr & 3)
return banshee_read_linear_w(addr, p) | (banshee_read_linear_w(addr+2, p) << 16);
cycles -= voodoo->read_time;
cycles_lost += voodoo->read_time;
@ -1439,6 +1445,13 @@ static void banshee_write_linear_w(uint32_t addr, uint16_t val, void *p)
voodoo_t *voodoo = banshee->voodoo;
svga_t *svga = &banshee->svga;
if (addr & 1)
{
banshee_write_linear(addr, val, p);
banshee_write_linear(addr + 1, val >> 8, p);
return;
}
cycles -= voodoo->write_time;
cycles_lost += voodoo->write_time;
@ -1474,6 +1487,13 @@ static void banshee_write_linear_l(uint32_t addr, uint32_t val, void *p)
svga_t *svga = &banshee->svga;
int timing;
if (addr & 3)
{
banshee_write_linear_w(addr, val, p);
banshee_write_linear_w(addr + 2, val >> 16, p);
return;
}
if (addr == voodoo->last_write_addr+4)
timing = voodoo->burst_time;
else