Revision faa3ff56
Added by Leszek Koltunski almost 7 years ago
| src/main/java/org/distorted/library/effect/PostprocessEffectBlur.java | ||
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import org.distorted.library.type.Data1D; |
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/////////////////////////////////////////////////////////////////////////////////////////////////// |
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/** |
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* Blur the Framebuffer. |
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*/ |
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public class PostprocessEffectBlur extends PostprocessEffect |
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{
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private static final int MAX_HALO = 50; |
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private static int mIndex1, mIndex2; |
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/////////////////////////////////////////////////////////////////////////////////////////////////// |
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/** |
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* Blur the object. |
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* |
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* @param blurRadius The 'strength' if the effect, in pixels. 0 = no blur, 10 = when blurring a given pixel, |
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* take into account 10 pixels in each direction. |
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*/ |
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public PostprocessEffectBlur(Data1D blurRadius) |
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// This implements the 'Better separable implementation using GPU fixed function sampling' from |
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// https://software.intel.com/en-us/blogs/2014/07/15/an-investigation-of-fast-real-time-gpu-based-image-blur-algorithms |
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private void computeGaussianKernel(int radius) |
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{
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super(EffectName.BLUR); |
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mBlurRadius = blurRadius; |
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int offset = radius + radius*radius/4; |
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if( weightsCache[offset]==0.0f ) |
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{
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float z, x= 0.0f, P= (float)NUM_GAUSSIAN / (radius>3 ? radius:3); |
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mWeights[0] = GAUSSIAN[0]; |
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float sum = GAUSSIAN[0]; |
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int j; |
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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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mWeights[i] = (1-z)*GAUSSIAN[j] + z*GAUSSIAN[j+1]; |
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sum += 2*mWeights[i]; |
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} |
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for(int i=0; i<=radius; i++) mWeights[i] /= sum; |
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int numloops = radius/2; |
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weightsCache[offset] = mWeights[0]; |
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offsetsCache[offset] = 0.0f; |
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for(int i=0; i<numloops; i++) |
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{
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offsetsCache[offset+i+1] = mWeights[2*i+1]*(2*i+1) + mWeights[2*i+2]*(2*i+2); |
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weightsCache[offset+i+1] = mWeights[2*i+1] + mWeights[2*i+2]; |
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offsetsCache[offset+i+1]/= weightsCache[offset+i+1]; |
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} |
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if( radius%2 == 1 ) |
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{
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int index = offset + radius/2 +1; |
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offsetsCache[index]=radius; |
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weightsCache[index]=mWeights[radius]; |
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} |
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} |
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} |
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/////////////////////////////////////////////////////////////////////////////////////////////////// |
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/** |
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* Only for use by the library itself. |
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* |
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* @y.exclude |
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*/ |
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public boolean compute(float[] uniforms, int index, long currentDuration, long step ) |
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{
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return mBlurRadius.get(uniforms,index,currentDuration,step); |
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} |
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/////////////////////////////////////////////////////////////////////////////////////////////////// |
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/** |
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* Only for use by the library itself. |
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* |
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* @y.exclude |
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*/ |
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public int apply(float[] uniforms, int index, float qualityScale, DistortedFramebuffer buffer) |
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{
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if( mProgram1 ==null) |
| ... | ... | |
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} |
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/////////////////////////////////////////////////////////////////////////////////////////////////// |
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// PUBLIC API |
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/////////////////////////////////////////////////////////////////////////////////////////////////// |
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/** |
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* Have to call this before the shaders get compiled (i.e before Distorted.onCreate()) for the Effect to work. |
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*/ |
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public static void enable() |
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{
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final String blurVertex = |
| ... | ... | |
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} |
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/////////////////////////////////////////////////////////////////////////////////////////////////// |
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// This implements the 'Better separable implementation using GPU fixed function sampling' from |
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// https://software.intel.com/en-us/blogs/2014/07/15/an-investigation-of-fast-real-time-gpu-based-image-blur-algorithms |
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private void computeGaussianKernel(int radius) |
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/** |
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* Blur the Framebuffer. |
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* |
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* @param blurRadius The 'strength' if the effect, in pixels. 0 = no blur, 10 = when blurring a given pixel, |
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* take into account 10 pixels in each direction. |
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*/ |
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public PostprocessEffectBlur(Data1D blurRadius) |
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{
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int offset = radius + radius*radius/4; |
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if( weightsCache[offset]==0.0f ) |
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{
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float z, x= 0.0f, P= (float)NUM_GAUSSIAN / (radius>3 ? radius:3); |
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mWeights[0] = GAUSSIAN[0]; |
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float sum = GAUSSIAN[0]; |
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int j; |
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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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mWeights[i] = (1-z)*GAUSSIAN[j] + z*GAUSSIAN[j+1]; |
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sum += 2*mWeights[i]; |
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} |
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for(int i=0; i<=radius; i++) mWeights[i] /= sum; |
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int numloops = radius/2; |
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weightsCache[offset] = mWeights[0]; |
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offsetsCache[offset] = 0.0f; |
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for(int i=0; i<numloops; i++) |
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{
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offsetsCache[offset+i+1] = mWeights[2*i+1]*(2*i+1) + mWeights[2*i+2]*(2*i+2); |
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weightsCache[offset+i+1] = mWeights[2*i+1] + mWeights[2*i+2]; |
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offsetsCache[offset+i+1]/= weightsCache[offset+i+1]; |
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} |
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if( radius%2 == 1 ) |
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{
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int index = offset + radius/2 +1; |
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offsetsCache[index]=radius; |
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weightsCache[index]=mWeights[radius]; |
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} |
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} |
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super(EffectName.BLUR); |
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mBlurRadius = blurRadius; |
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} |
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} |
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