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MGA: Implement gamma-correction for <= 16 bpp modes

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Cacodemon345
2023-12-25 15:24:52 +06:00
parent 278661c41c
commit 1bd4bbdfa1
4 changed files with 104 additions and 68 deletions
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26
src/video/vid_mga.c
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@@ -5728,6 +5728,31 @@ mystique_pci_write(UNUSED(int func), int addr, uint8_t val, void *priv)
}
}
static uint32_t
mystique_conv_16to32(svga_t* svga, uint16_t color, uint8_t bpp)
{
mystique_t *mystique = (mystique_t*)svga->priv;
if (svga->lut_map) {
if (bpp == 15) {
if (mystique->xgenctrl & (1 << 2)) {
color &= 0x7FFF;
}
uint8_t b = getcolr(svga->pallook[(color & 0x1F) | (!!(color & 0x8000) >> 8)]);
uint8_t g = getcolg(svga->pallook[((color & 0x3E0) >> 5) | (!!(color & 0x8000) >> 8)]);
uint8_t r = getcolb(svga->pallook[((color & 0x7C00) >> 10) | (!!(color & 0x8000) >> 8)]);
return video_15to32[color] & 0xFF000000 | makecol(r, g, b);
} else {
uint8_t b = getcolr(svga->pallook[color & 0x1f]);
uint8_t g = getcolg(svga->pallook[(color & 0x7e0) >> 5]);
uint8_t r = getcolb(svga->pallook[(color & 0xf800) >> 11]);
return video_16to32[color] & 0xFF000000 | makecol(r, g, b);
}
}
return (bpp == 15) ? video_15to32[color] : video_16to32[color];
}
static void *
mystique_init(const device_t *info)
{
@@ -5852,6 +5877,7 @@ mystique_init(const device_t *info)
mystique->softrap_status_read = 1;
mystique->svga.vsync_callback = mystique_vsync_callback;
mystique->svga.conv_16to32 = mystique_conv_16to32;
mystique->i2c = i2c_gpio_init("i2c_mga");
mystique->i2c_ddc = i2c_gpio_init("ddc_mga");