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Implement dirty updating on Banshee 16bpp tiled modes

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This commit is contained in:
SarahW 2020-09-27 21:45:02 +01:00
commit 3e5e519d10
1 changed files with 20 additions and 11 deletions
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31
src/vid_voodoo_banshee.c
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@ -292,25 +292,34 @@ static void banshee_render_16bpp_tiled(svga_t *svga)
int offset = 32;
uint32_t *p = &((uint32_t *)buffer32->line[svga->displine])[offset];
uint32_t addr = banshee->desktop_addr + (banshee->desktop_y & 31) * 128 + ((banshee->desktop_y >> 5) * banshee->desktop_stride_tiled);
if (svga->firstline_draw == 2000)
svga->firstline_draw = svga->displine;
svga->lastline_draw = svga->displine;
int drawn = 0;
for (x = 0; x <= svga->hdisp; x += 64)
{
int xx;
for (xx = 0; xx < 64; xx += 2)
if (svga->hwcursor_on || svga->overlay_on)
svga->changedvram[addr >> 12] = 2;
if (svga->changedvram[addr >> 12] || svga->fullchange)
{
uint32_t dat = *(uint32_t *)(&svga->vram[(addr + (xx << 1)) & svga->vram_display_mask]);
*p++ = video_16to32[dat & 0xffff];
*p++ = video_16to32[dat >> 16];
uint16_t *vram_p = (uint16_t *)&svga->vram[addr & svga->vram_display_mask];
int xx;
for (xx = 0; xx < 64; xx++)
*p++ = video_16to32[*vram_p++];
drawn = 1;
}
else
p += 64;
addr += 128*32;
}
if (drawn)
{
if (svga->firstline_draw == 2000)
svga->firstline_draw = svga->displine;
svga->lastline_draw = svga->displine;
}
banshee->desktop_y++;
}