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Okay, it looks like colour 3 is approximately phase offset 0, and the palette wraps around after 14 entries, not 16. Also got a bit less dependent on floating point accuracy for the step.

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Thomas Harte 2015-09-05 17:10:41 -04:00 committed by Thomas Harte
parent 39027b675d
commit 7fb6c86d9d
1 changed files with 2 additions and 2 deletions
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4
Machines/Atari2600.cpp
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@ -158,8 +158,8 @@ const char *Machine::get_signal_decoder()
"{\n" "{\n"
"vec2 c = texture(texID, coordinate).rg;" "vec2 c = texture(texID, coordinate).rg;"
"float y = 0.1 + c.x * 0.91071428571429;\n" "float y = 0.1 + c.x * 0.91071428571429;\n"
"float aOffset = 6.283185308 * c.y;\n" "float aOffset = 6.283185308 * (c.y - 3.0 / 16.0) * 1.14285714285714;\n"
"return y + step(0.0625, c.y) * 0.1 * sin(phase + aOffset);\n" "return y + step(0.03125, c.y) * 0.1 * sin(phase + aOffset);\n"
"}"; "}";
} }