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Minor adjustments to ensure sampling occurs as intended.

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This commit is contained in:
Thomas Harte 2016-04-30 20:48:09 -04:00
parent 16ef09fc2b
commit fe2abbd4ed
1 changed files with 15 additions and 12 deletions
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27
Outputs/CRT/Internals/Shaders/IntermediateShader.cpp
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@ -61,17 +61,17 @@ std::unique_ptr<IntermediateShader> IntermediateShader::make_shader(const char *
"iInputPositionVarying = extendedInputPosition;"
"vec2 mappedInputPosition = (extendedInputPosition + vec2(0.0, 0.5)) / textureSize;"
"inputPositionsVarying[0] = mappedInputPosition - (vec2(offsets[4], 0.0) / textureSize);"
"inputPositionsVarying[1] = mappedInputPosition - (vec2(offsets[3], 0.0) / textureSize);"
"inputPositionsVarying[0] = mappedInputPosition - (vec2(offsets[0], 0.0) / textureSize);"
"inputPositionsVarying[1] = mappedInputPosition - (vec2(offsets[1], 0.0) / textureSize);"
"inputPositionsVarying[2] = mappedInputPosition - (vec2(offsets[2], 0.0) / textureSize);"
"inputPositionsVarying[3] = mappedInputPosition - (vec2(offsets[1], 0.0) / textureSize);"
"inputPositionsVarying[4] = mappedInputPosition - (vec2(offsets[0], 0.0) / textureSize);"
"inputPositionsVarying[3] = mappedInputPosition - (vec2(offsets[3], 0.0) / textureSize);"
"inputPositionsVarying[4] = mappedInputPosition - (vec2(offsets[4], 0.0) / textureSize);"
"inputPositionsVarying[5] = mappedInputPosition;"
"inputPositionsVarying[6] = mappedInputPosition + (vec2(offsets[0], 0.0) / textureSize);"
"inputPositionsVarying[7] = mappedInputPosition + (vec2(offsets[1], 0.0) / textureSize);"
"inputPositionsVarying[6] = mappedInputPosition + (vec2(offsets[4], 0.0) / textureSize);"
"inputPositionsVarying[7] = mappedInputPosition + (vec2(offsets[3], 0.0) / textureSize);"
"inputPositionsVarying[8] = mappedInputPosition + (vec2(offsets[2], 0.0) / textureSize);"
"inputPositionsVarying[9] = mappedInputPosition + (vec2(offsets[3], 0.0) / textureSize);"
"inputPositionsVarying[10] = mappedInputPosition + (vec2(offsets[4], 0.0) / textureSize);"
"inputPositionsVarying[9] = mappedInputPosition + (vec2(offsets[1], 0.0) / textureSize);"
"inputPositionsVarying[10] = mappedInputPosition + (vec2(offsets[0], 0.0) / textureSize);"
"delayLinePositionVarying = mappedInputPosition - vec2(0.0, 1.0);"
"phaseAndAmplitudeVarying.x = (phaseCyclesPerTick * (extendedOutputPosition.x - phaseTime) + phaseAmplitudeAndOffset.x) * 2.0 * 3.141592654;"
@ -284,23 +284,26 @@ void IntermediateShader::set_filter_coefficients(float sampling_rate, float cuto
int sample = 0;
int c = 0;
memset(weights, 0, sizeof(float)*12);
while(c < (taps >> 1) && sample < 5)
memset(offsets, 0, sizeof(float)*5);
int halfSize = (taps >> 1);
while(c < halfSize && sample < 5)
{
offsets[sample] = (float)(halfSize - c);
if((coefficients[c] < 0.0f) == (coefficients[c+1] < 0.0f) && c+1 < (taps >> 1))
{
weights[sample] = coefficients[c] + coefficients[c+1];
offsets[sample] = (float)c + 1.0f + (coefficients[c+1] / weights[sample]);
offsets[sample] -= (coefficients[c+1] / weights[sample]);
c += 2;
}
else
{
offsets[sample] = (float)c + 1.0f;
weights[sample] = coefficients[c];
c++;
}
sample ++;
}
if(c == (taps >> 1))
if(c == halfSize) // i.e. we finished combining inputs before we ran out of space
{
weights[sample] = coefficients[c];
for(int c = 0; c < sample; c++)