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Improves PAL colours.

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This commit is contained in:
Thomas Harte 2018-11-29 19:12:20 -08:00
parent 6be46ae921
commit b723740f64
1 changed files with 3 additions and 16 deletions
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19
Machines/Atari2600/TIA.cpp
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@ -196,29 +196,16 @@ void TIA::set_colour_palette_entry(size_t index, uint8_t colour) {
phase &= 127;
}
} else {
// TODO: PAL colours.
// crt_.set_svideo_sampling_function(
// "vec2 svideo_sample(usampler2D texID, vec2 coordinate, float phase, float amplitude)"
// "{"
// "uint c = texture(texID, coordinate).r;"
// "uint y = c & 14u;"
// "uint iPhase = (c >> 4);"
//
// "uint direction = iPhase & 1u;"
// "float phaseOffset = float(7u - direction) + (float(direction) - 0.5) * 2.0 * float(iPhase >> 1);"
// "phaseOffset *= 6.283185308 / 12.0;"
// "return vec2(float(y) / 14.0, step(4, (iPhase + 2u) & 15u) * cos(phase + phaseOffset));"
// "}");
if(phase < 2 || phase > 13) {
phase = 255;
} else {
const auto direction = phase & 1;
phase >>= 1;
if(!direction) phase ^= 0xf;
phase += 7 - direction;
if(direction) phase ^= 0xf;
phase = (phase + 6 + direction) & 0xf;
phase = (((phase - 3) & 0xf) * 127) / 12;
phase = (phase * 127) / 12;
phase &= 127;
}
}