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Swap the XGA 4bpp rendering nibbles for proper display.

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Fixes incorrect rendering of XGA 4bpp accelerated modes (INMOS XGA ISA and XGA MCA add-ons)
This commit is contained in:
TC1995
2025-11-02 00:52:20 +01:00
parent 57349bedd3
commit 79614f6ada
1 changed files with 19 additions and 19 deletions
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38
src/video/vid_xga.c
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@@ -2716,15 +2716,15 @@ xga_hwcursor_draw(svga_t *svga, int displine)
if (x >= idx) {
switch (comb) {
case 0x00:
/* Cursor Color 1 */
/* Cursor Color 1 */
p[x_pos] = xga->hwc_color0;
break;
case 0x01:
/* Cursor Color 2 */
/* Cursor Color 2 */
p[x_pos] = xga->hwc_color1;
break;
case 0x03:
/* Complement */
/* Complement */
p[x_pos] ^= 0xffffff;
break;
@@ -2793,24 +2793,24 @@ xga_render_4bpp(svga_t *svga)
for (int x = 0; x <= xga->h_disp; x += 16) {
dat = *(uint32_t *) (&xga->vram[xga->memaddr & xga->vram_mask]);
p[1] = xga->pallook[dat & 0x0f];
p[0] = xga->pallook[(dat >> 4) & 0x0f];
p[3] = xga->pallook[(dat >> 8) & 0x0f];
p[2] = xga->pallook[(dat >> 12) & 0x0f];
p[5] = xga->pallook[(dat >> 16) & 0x0f];
p[4] = xga->pallook[(dat >> 20) & 0x0f];
p[7] = xga->pallook[(dat >> 24) & 0x0f];
p[6] = xga->pallook[(dat >> 28) & 0x0f];
p[0] = xga->pallook[dat & 0x0f];
p[1] = xga->pallook[(dat >> 4) & 0x0f];
p[2] = xga->pallook[(dat >> 8) & 0x0f];
p[3] = xga->pallook[(dat >> 12) & 0x0f];
p[4] = xga->pallook[(dat >> 16) & 0x0f];
p[5] = xga->pallook[(dat >> 20) & 0x0f];
p[6] = xga->pallook[(dat >> 24) & 0x0f];
p[7] = xga->pallook[(dat >> 28) & 0x0f];
dat = *(uint32_t *) (&xga->vram[(xga->memaddr + 4) & xga->vram_mask]);
p[9] = xga->pallook[dat & 0x0f];
p[8] = xga->pallook[(dat >> 4) & 0x0f];
p[11] = xga->pallook[(dat >> 8) & 0x0f];
p[10] = xga->pallook[(dat >> 12) & 0x0f];
p[13] = xga->pallook[(dat >> 16) & 0x0f];
p[12] = xga->pallook[(dat >> 20) & 0x0f];
p[15] = xga->pallook[(dat >> 24) & 0x0f];
p[14] = xga->pallook[(dat >> 28) & 0x0f];
p[8] = xga->pallook[dat & 0x0f];
p[9] = xga->pallook[(dat >> 4) & 0x0f];
p[10] = xga->pallook[(dat >> 8) & 0x0f];
p[11] = xga->pallook[(dat >> 12) & 0x0f];
p[12] = xga->pallook[(dat >> 16) & 0x0f];
p[13] = xga->pallook[(dat >> 20) & 0x0f];
p[14] = xga->pallook[(dat >> 24) & 0x0f];
p[15] = xga->pallook[(dat >> 28) & 0x0f];
xga->memaddr += 8;
p += 16;