Revision a225e5aa
Added by Leszek Koltunski over 7 years ago
| src/main/java/org/distorted/library/EffectQueuePostprocess.java | ||
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class EffectQueuePostprocess extends EffectQueue |
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{
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private static final float GAUSSIAN[] = // G(0.00), G(0.03), G(0.06), ..., G(3.00) where G(x)= (1/(sqrt(2*PI))) * e^(-(x^2)/2)
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{
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private static final float GAUSSIAN[] = // G(0.00), G(0.03), G(0.06), ..., G(3.00), 0
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{ // where G(x)= (1/(sqrt(2*PI))) * e^(-(x^2)/2). The last 0 terminates.
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0.398948f, 0.398769f, 0.398231f, 0.397336f, 0.396086f, 0.394485f, 0.392537f, 0.390247f, 0.387622f, 0.384668f, |
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0.381393f, 0.377806f, 0.373916f, 0.369733f, 0.365268f, 0.360532f, 0.355538f, 0.350297f, 0.344823f, 0.339129f, |
| 50 | 50 |
0.333229f, 0.327138f, 0.320868f, 0.314436f, 0.307856f, 0.301142f, 0.294309f, 0.287373f, 0.280348f, 0.273248f, |
| ... | ... | |
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0.043984f, 0.041280f, 0.038707f, 0.036262f, 0.033941f, 0.031740f, 0.029655f, 0.027682f, 0.025817f, 0.024056f, |
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0.022395f, 0.020830f, 0.019357f, 0.017971f, 0.016670f, 0.015450f, 0.014305f, 0.013234f, 0.012232f, 0.011295f, |
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0.010421f, 0.009606f, 0.008847f, 0.008140f, 0.007483f, 0.006873f, 0.006307f, 0.005782f, 0.005296f, 0.004847f, |
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0.004432f |
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0.004432f, 0.000000f
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}; |
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private static final float NUM_GAUSSIAN = GAUSSIAN.length-1;
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private static final int NUM_GAUSSIAN = GAUSSIAN.length-2;
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private static final int MAX_BLUR = 50; |
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|
| ... | ... | |
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{
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if( radius>=MAX_BLUR ) radius = MAX_BLUR-1; |
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// Box Blur size 'radius' |
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/* |
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for(int i=0; i<=radius; i++) |
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{
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// Box Blur size 'radius' |
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mWeights[i] = 1.0f / (2.0f*radius+1.0f); |
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mOffsets[i] = i*height; |
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} |
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*/ |
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// Gaussian Blur size 'radius' |
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float P = (float)NUM_GAUSSIAN / (radius>3 ? radius:3); |
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float x = 0.0f; |
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mWeights[0] = GAUSSIAN[0]; |
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mOffsets[0] = 0.0f; |
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float sum = GAUSSIAN[0]; |
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int j; |
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float z; |
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for(int i=1; i<=radius; i++) |
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{
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x += P; |
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j = (int)x; |
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z = x-j; |
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// Gaussian Blur size 'radius' |
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mWeights[i] = (1-z)*GAUSSIAN[j] + z*GAUSSIAN[j+1]; |
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sum += 2*mWeights[i]; |
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mOffsets[i] = i*height; |
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} |
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for(int i=0; i<=radius; i++) |
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{
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mWeights[i] /= sum; |
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} |
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// squash the weights and offsets for linear sampling |
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int numloops = radius/2; |
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for(int i=0; i<numloops; i++) |
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{
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mOffsets[i+1] = mWeights[2*i+1]*mOffsets[2*i+1] + mWeights[2*i+2]*mOffsets[2*i+2]; |
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mWeights[i+1] = mWeights[2*i+1] + mWeights[2*i+2]; |
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mOffsets[i+1] /= mWeights[i+1]; |
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} |
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if( radius%2 == 1 ) |
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{
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int index = radius/2 +1; |
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mOffsets[index]=mOffsets[radius]; |
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mWeights[index]=mWeights[radius]; |
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radius = numloops+1; |
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} |
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else |
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{
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radius = numloops; |
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} |
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return radius; |
Also available in: Unified diff
Separable Gaussian Blur with linear sampling done.
Linear sampling implemented - i.e. blurring by a (2N+1)x(2N+1) gaussian kernel (centeral pixel + N pixels in each direction) requires exactly 2N + (N%2==1 ? 4:2) texture fetches.