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Implement proper alpha stipple

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Cacodemon345 2023-12-31 16:43:01 +06:00
parent ca21ea528a
commit 6366e1c58c
1 changed files with 4 additions and 35 deletions
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37
src/video/vid_mga.c
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@ -668,8 +668,6 @@ static double bayer_mat[4][4] =
{ 15. / 16., 7. / 16., 13. / 16., 5. / 16.},
};
static const int grey_lut[16] = { 0, 16, 32, 48, 64, 80, 96, 112, 128, 143, 159, 175, 191, 207, 223, 239 };
static video_timings_t timing_matrox_millennium = { .type = VIDEO_PCI, .write_b = 2, .write_w = 2, .write_l = 1, .read_b = 10, .read_w = 10, .read_l = 10 };
static video_timings_t timing_matrox_mystique = { .type = VIDEO_PCI, .write_b = 4, .write_w = 4, .write_l = 4, .read_b = 10, .read_w = 10, .read_l = 10 };
@ -5204,44 +5202,15 @@ blit_texture_trap(mystique_t *mystique)
if (final_a != 255)
{
/* Does this actually work? I'm not sure. */
if (final_a & 0xf) {
{
double threshold = bayer_mat[mystique->dwgreg.selline & 3][x_l & 3];
double final_a_frac = (final_a & 0xf) / 16.;
double final_a_frac = (final_a) / 255.;
if (final_a_frac >= threshold) {
if ((final_a >> 4) == 0x0)
final_a = grey_lut[1];
else if ((final_a >> 4) == 0xf)
final_a = 255;
else
final_a = grey_lut[final_a >> 4];
} else {
if ((final_a >> 4) == 0x0)
final_a = 0;
else
final_a = grey_lut[(final_a >> 4) - 1];
goto skip_pixel;
}
}
if (dest32) {
uint32_t dst_col = ((uint32_t *) svga->vram)[(mystique->dwgreg.ydst_lin + x_l) & mystique->vram_mask_l];
uint8_t dst_b = dst_col & 0xFF;
uint8_t dst_g = (dst_col >> 8) & 0xFF;
uint8_t dst_r = (dst_col >> 16) & 0xFF;
tex_r = (tex_r * ((final_a) / 255.)) + dst_r * ((255 - final_a) / 255.);
tex_g = (tex_g * ((final_a) / 255.)) + dst_g * ((255 - final_a) / 255.);
tex_b = (tex_b * ((final_a) / 255.)) + dst_b * ((255 - final_a) / 255.);
} else {
uint16_t dst_col = ((uint16_t *) svga->vram)[(mystique->dwgreg.ydst_lin + x_l) & mystique->vram_mask_w];
uint8_t dst_b = (dst_col & 0x1f) << 3;
uint8_t dst_g = (dst_col & 0x7e0) >> 3;
uint8_t dst_r = (dst_col & 0xf800) >> 8;
tex_r = (tex_r * ((final_a) / 255.)) + dst_r * ((255 - final_a) / 255.);
tex_g = (tex_g * ((final_a) / 255.)) + dst_g * ((255 - final_a) / 255.);
tex_b = (tex_b * ((final_a) / 255.)) + dst_b * ((255 - final_a) / 255.);
}
}
if (dest32) {