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effects: Reduce loop count with Gaussian Blur

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This commit is contained in:
Michael Fabian Dirks 2017-07-18 16:47:04 +02:00
parent 9c56898842
commit 0570904c5b
1 changed files with 14 additions and 9 deletions
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23
data/effects/gaussian-blur.effect
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@ -29,17 +29,22 @@ VertDataOut VSDefault(VertDataIn v_in)
}
// Gaussian Blur
float Gaussian(float x, float deviation) {
return (1.0 / sqrt(2.0 * 3.141592 * deviation)) * exp(-((x * x) / (2.0 * deviation)));
float Gaussian(float x, float o) {
const float pivalue = 3.1415926535897932384626433832795;
return (1.0 / (o * sqrt(2.0 * pivalue))) * exp((-(x * x)) / (2 * (o * o)));
}
float4 PSGaussian(VertDataOut v_in) : TARGET
{
float4 rgba = float4(0, 0, 0, 0);
for (int k = -widthHalf; k <= widthHalf; k++) {
float4 smpl = image.Sample(textureSampler, v_in.uv + (texel * k));
smpl *= Gaussian(k, width / 2.0);
rgba += smpl;
float4 PSGaussian(VertDataOut v_in) : TARGET {
const float pivalue = 3.1415926535897932384626433832795;
float4 rgba = image.Sample(textureSampler, v_in.uv) * Gaussian(0, width / pivalue);
float2 uvoffset = texel;
for (int k = 1; k <= widthHalf; k++) {
float g = Gaussian(k, width / pivalue);
float4 spos = image.Sample(textureSampler, v_in.uv + uvoffset) * g;
float4 sneg = image.Sample(textureSampler, v_in.uv - uvoffset) * g;
rgba += spos + sneg;
uvoffset += texel;
}
return rgba;
}