private void updateMarginsAndPasses()
{
if (mBlurX == 0 && mBlurY == 0)
{
mBlurX = 0.001f;
}
setNumPasses(AsMath.ceil(mBlurX) + AsMath.ceil(mBlurY));
setMarginX(4 + AsMath.ceil(mBlurX));
setMarginY(4 + AsMath.ceil(mBlurY));
}
private void updateParameters(int pass, int textureWidth, int textureHeight)
{
float sigma = 0;
bool horizontal = pass < mBlurX;
float pixelSize = 0;
if (horizontal)
{
sigma = AsMath.min(1.0f, mBlurX - pass) * MAX_SIGMA;
pixelSize = 1.0f / textureWidth;
}
else
{
sigma = AsMath.min(1.0f, mBlurY - (pass - AsMath.ceil(mBlurX))) * MAX_SIGMA;
pixelSize = 1.0f / textureHeight;
}
float twoSigmaSq = 2 * sigma * sigma;
float multiplier = 1.0f / AsMath.sqrt(twoSigmaSq * AsMath.PI);
int i = 0;
for (; i < 4; ++i)
{
sTmpWeights[i] = multiplier * AsMath.exp(-i * i / twoSigmaSq);
}
mWeights[0] = sTmpWeights[0];
mWeights[1] = sTmpWeights[1] + sTmpWeights[2];
mWeights[2] = sTmpWeights[3] + sTmpWeights[4];
float weightSum = mWeights[0] + 2 * mWeights[1] + 2 * mWeights[2];
float invWeightSum = 1.0f / weightSum;
mWeights[0] = mWeights[0] * invWeightSum;
mWeights[1] = mWeights[1] * invWeightSum;
mWeights[2] = mWeights[2] * invWeightSum;
float offset1 = (pixelSize * sTmpWeights[1] + 2 * pixelSize * sTmpWeights[2]) / mWeights[1];
float offset2 = (3 * pixelSize * sTmpWeights[3] + 4 * pixelSize * sTmpWeights[4]) / mWeights[2];
if (horizontal)
{
mOffsets[0] = offset1;
mOffsets[1] = 0;
mOffsets[2] = offset2;
mOffsets[3] = 0;
}
else
{
mOffsets[0] = 0;
mOffsets[1] = offset1;
mOffsets[2] = 0;
mOffsets[3] = offset2;
}
}
