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Experimented with table-based GLSL lookups, and a sine curve. Now _exceedingly_ slow, but colours are correct if I pretend I'm in the YUV colour space.

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This commit is contained in:
Thomas Harte 2016-06-12 14:57:24 -04:00
parent 2992183aae
commit 8abf395202
1 changed files with 37 additions and 10 deletions
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47
Components/6560/6560.cpp
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@ -48,26 +48,53 @@ MOS6560::MOS6560() :
_vertical_counter(0)
{
_crt->set_composite_sampling_function(
"float angles[8] = float[]("
"2.356194490192345," // orange
"2.748893571891069," // light yellow
"float angles[16] = float[]("
"0.0," // black
"0.0," // white
"1.963495408493621," // red
"5.105088062083414," // cyan
"0.785398163397448," // purple
"3.926990816987241," // green
"0.0," // blue
"3.141592653589793" // yellow
"3.141592653589793," // yellow
"2.356194490192345," // orange
"2.748893571891069," // light yellow
"1.963495408493621," // light red
"5.105088062083414," // light cyan
"0.785398163397448," // light purple
"3.926990816987241," // light green
"0.0," // light blue
"3.141592653589793" // light yellow
");"
"float brightnesses[16] = float[]("
"0.0 / 255.0,"
"255.0 / 255.0,"
"79.6875 / 255.0,"
"159.375 / 255.0,"
"95.625 / 255.0,"
"127.5 / 255.0,"
"63.75 / 255.0,"
"191.25 / 255.0,"
"95.625 / 255.0,"
"63.75 / 255.0,"
"127.5 / 255.0,"
"189.375 / 255.0,"
"135.625 / 255.0,"
"191.25 / 255.0,"
"119.53125 / 255.0,"
"159.375 / 255.0"
");"
"float composite_sample(usampler2D texID, vec2 coordinate, vec2 iCoordinate, float phase, float amplitude)"
"{"
"uint c = texture(texID, coordinate).r;"
"float y = 0.75 + (float(c & 8u) / 8.0) * 0.25 * step(1, c);"
"float y = brightnesses[c];"
"float phaseOffset = angles[c];"
"uint iPhase = c & 7u;"
"float phaseOffset = angles[iPhase];"
// sin(phase + phaseOffset)
"return mix(step(1, c) * y, step(2, c) * step(3.141592654, mod(phase + phaseOffset, 6.283185308)) * 2.0 - 1.0, amplitude);" // TODO: square wave (step(3.141592654, mod(phase + phaseOffset, 6.283185308))?)
// "float chroma = step(3.141592654, mod(phase + phaseOffset, 6.283185308)) * 2.0 - 1.0;"
"float chroma = cos(phase + phaseOffset);"
"return mix(y, chroma, amplitude);"
"}");
}