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XGA: Blitting direction does not affect the order of the bits in memory, fixes the IBM Windows 3.1 XGA driver.

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OBattler
2025-07-13 07:55:49 +02:00
parent 51cd80e7b1
commit 97cfbb41a1
1 changed files with 2 additions and 4 deletions
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6
src/video/vid_xga.c
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@@ -993,12 +993,10 @@ xga_accel_read_pattern_map_pixel(svga_t *svga, int x, int y, uint32_t base, int
uint8_t byte; uint8_t byte;
uint8_t px; uint8_t px;
int skip = 0; int skip = 0;
int x_dir = (xga->accel.octant & 0x04) ? -1 : 1; int pos = (y * width) + x;
int y_dir = (xga->accel.octant & 0x02) ? -1 : 1;
int pos = ((y * width * y_dir) + (x * x_dir));
addr += (pos / 8); addr += (pos / 8);
bits = 7 - (abs(pos) & 7); bits = 7 - (pos & 7);
if ((addr < xga->linear_base) || (addr > (xga->linear_base + 0xfffff))) if ((addr < xga->linear_base) || (addr > (xga->linear_base + 0xfffff)))
skip = 1; skip = 1;