Distorted Android

import android.opengl.GLES30;

import org.distorted.library.main.DistortedFramebuffer;

import org.distorted.library.main.InternalRenderState;

import org.distorted.library.program.DistortedProgram;

public class PostprocessEffectBlur extends PostprocessEffect

  private static final int MAX_RADIUS = 50;

  private final Data2D mBlurHaloAndRadius;

  private static final float[] GAUSSIAN =   // G(0.00), G(0.03), G(0.06), ..., G(3.00), 0

    {                                       // where G(x)= (1/(sqrt(2*PI))) * e^(-(x^2)/2). The last 0 terminates.

    0.398948f, 0.398769f, 0.398231f, 0.397336f, 0.396086f, 0.394485f, 0.392537f, 0.390247f, 0.387622f, 0.384668f,

    0.381393f, 0.377806f, 0.373916f, 0.369733f, 0.365268f, 0.360532f, 0.355538f, 0.350297f, 0.344823f, 0.339129f,

    0.333229f, 0.327138f, 0.320868f, 0.314436f, 0.307856f, 0.301142f, 0.294309f, 0.287373f, 0.280348f, 0.273248f,

    0.266089f, 0.258884f, 0.251648f, 0.244394f, 0.237135f, 0.229886f, 0.222657f, 0.215461f, 0.208311f, 0.201217f,

    0.194189f, 0.187238f, 0.180374f, 0.173605f, 0.166940f, 0.160386f, 0.153951f, 0.147641f, 0.141462f, 0.135420f,

    0.129520f, 0.123765f, 0.118159f, 0.112706f, 0.107408f, 0.102266f, 0.097284f, 0.092461f, 0.087797f, 0.083294f,

    0.078951f, 0.074767f, 0.070741f, 0.066872f, 0.063158f, 0.059596f, 0.056184f, 0.052920f, 0.049801f, 0.046823f,

    0.043984f, 0.041280f, 0.038707f, 0.036262f, 0.033941f, 0.031740f, 0.029655f, 0.027682f, 0.025817f, 0.024056f,

    0.022395f, 0.020830f, 0.019357f, 0.017971f, 0.016670f, 0.015450f, 0.014305f, 0.013234f, 0.012232f, 0.011295f,

    0.010421f, 0.009606f, 0.008847f, 0.008140f, 0.007483f, 0.006873f, 0.006307f, 0.005782f, 0.005296f, 0.004847f,

    0.004432f, 0.000000f

    };

  private static final int NUM_GAUSSIAN = GAUSSIAN.length-2;

  // The (fixed-function-sampled) Gaussian Blur kernels are of the size k0=1, k1=2, k2=2, k3=3, k4=3, k5=4, k6=4,...

  // i.e. k(i)=floor((i+3)/2).  (the 'i' in k(i) means 'blur taking into account the present pixel and 'i' pixels

  // in all 4 directions)

  // We need room for MAX_BLUR of them, and sum(i=0...N, floor((i+3)/2)) = N + floor(N*N/4)

  private static final float[] weightsCache = new float[MAX_RADIUS + MAX_RADIUS*MAX_RADIUS/4];

  private static final float[] offsetsCache = new float[MAX_RADIUS + MAX_RADIUS*MAX_RADIUS/4];

  private static final float[] mWeights = new float[MAX_RADIUS];

  private static final float[] mOffsets = new float[MAX_RADIUS];

  private static DistortedProgram mProgram1, mProgram2;

  private static int mIndex1, mIndex2;

///////////////////////////////////////////////////////////////////////////////////////////////////

// Clean up of static variables on exit.

// called by reflection from super class.

  @SuppressWarnings("unused")

  static void destroyStatics()

    {

    mProgram1 = null;

    mProgram2 = null;

    mIndex1 = 0;

    mIndex2 = 0;

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

// This implements the 'Better separable implementation using GPU fixed function sampling' from

// https://software.intel.com/en-us/blogs/2014/07/15/an-investigation-of-fast-real-time-gpu-based-image-blur-algorithms

  private void computeGaussianKernel(int radius)

    {

    int offset = radius + radius*radius/4;

    if( weightsCache[offset]==0.0f )

      {

      float z, x= 0.0f, P= (float)NUM_GAUSSIAN / (radius>3 ? radius:3);

      mWeights[0] = GAUSSIAN[0];

      float sum   = GAUSSIAN[0];

      int j;

      for(int i=1; i<=radius; i++)

        {

        x += P;

        j = (int)x;

        z = x-j;

        mWeights[i] = (1-z)*GAUSSIAN[j] + z*GAUSSIAN[j+1];

        sum += 2*mWeights[i];

        }

      for(int i=0; i<=radius; i++) mWeights[i] /= sum;

      int numloops = radius/2;

      weightsCache[offset] = mWeights[0];

      offsetsCache[offset] = 0.0f;

      for(int i=0; i<numloops; i++)

        {

        offsetsCache[offset+i+1] = mWeights[2*i+1]*(2*i+1) + mWeights[2*i+2]*(2*i+2);

        weightsCache[offset+i+1] = mWeights[2*i+1] + mWeights[2*i+2];

        offsetsCache[offset+i+1]/= weightsCache[offset+i+1];

        }

      if( radius%2 == 1 )

        {

        int index = offset + radius/2 +1;

        offsetsCache[index]=radius;

        weightsCache[index]=mWeights[radius];

        }

      }

    }

    return mBlurHaloAndRadius.get(uniforms,index,currentDuration,step);

  public boolean getRender()

///////////////////////////////////////////////////////////////////////////////////////////////////

/**

 * Only for use by the library itself.

 *

 * @y.exclude

 */

  public int apply(float[] uniforms, int index, DistortedFramebuffer buffer)

    {

    if( mProgram1 ==null)

      {

      try

        {

        mProgram1 = mPrograms.get(mIndex1);

        mProgram2 = mPrograms.get(mIndex2);

        }

      catch(Exception ex)

        {

        return 0;

        }

      }

    InternalRenderState.useStencilMark();

    buffer.setAsOutput();

    float w= buffer.getWidth();

    float h= buffer.getHeight();

    float n= 1.0f - buffer.getNear();

    float corrW = buffer.getWidthCorrection();

    float corrH = buffer.getHeightCorrection();

    float offsetCorrW = corrW/w;

    float offsetCorrH = corrH/h;

    int radius = (int)(uniforms[index+1]*mQualityScale);

    if( radius>=MAX_RADIUS ) radius = MAX_RADIUS-1;

    if( radius<=0          ) radius = 1;

    computeGaussianKernel(radius);

    int offset = radius + radius*radius/4;

    radius = (radius+1)/2;

    GLES30.glViewport(0, 0, (int)w, (int)h);

    // horizontal blur

    for(int i=0; i<=radius; i++) mOffsets[i] = offsetsCache[offset+i]*offsetCorrW;

    mProgram1.useProgram();

    buffer.bindForOutput(1);

    buffer.setAsInput(0);

    GLES30.glTexParameteri( GLES30.GL_TEXTURE_2D, GLES30.GL_TEXTURE_WRAP_S, GLES30.GL_CLAMP_TO_EDGE);

    GLES30.glTexParameteri( GLES30.GL_TEXTURE_2D, GLES30.GL_TEXTURE_WRAP_T, GLES30.GL_CLAMP_TO_EDGE);

    GLES30.glColorMask(true,true,true,true);

    GLES30.glClearColor(1.0f,1.0f,1.0f,0.0f);

    GLES30.glClear(GLES30.GL_COLOR_BUFFER_BIT);

    GLES30.glUniform1f ( mProgram1.mUniform[0] , n );

    GLES30.glUniform2f ( mProgram1.mUniform[1] , corrW, corrH );

    GLES30.glUniform1i ( mProgram1.mUniform[2] , 0 );

    GLES30.glUniform1fv( mProgram1.mUniform[3] , radius+1, mOffsets,0);

    GLES30.glUniform1fv( mProgram1.mUniform[4] , radius+1, weightsCache,offset);

    GLES30.glUniform1i ( mProgram1.mUniform[5] , radius);

    GLES30.glVertexAttribPointer(mProgram1.mAttribute[0], POS_DATA_SIZE, GLES30.GL_FLOAT, false, 0, mQuadPositions);

    GLES30.glVertexAttribPointer(mProgram1.mAttribute[1], TEX_DATA_SIZE, GLES30.GL_FLOAT, false, 0, mQuadTexture);

    GLES30.glDrawArrays(GLES30.GL_TRIANGLE_STRIP, 0, 4);

    // vertical blur

    for(int i=0; i<=radius; i++) mOffsets[i] = offsetsCache[offset+i]*offsetCorrH;

    mProgram2.useProgram();

    buffer.bindForOutput(0);

    buffer.setAsInput(1);

    GLES30.glTexParameteri( GLES30.GL_TEXTURE_2D, GLES30.GL_TEXTURE_WRAP_S, GLES30.GL_CLAMP_TO_EDGE);

    GLES30.glTexParameteri( GLES30.GL_TEXTURE_2D, GLES30.GL_TEXTURE_WRAP_T, GLES30.GL_CLAMP_TO_EDGE);

    GLES30.glClear(GLES30.GL_COLOR_BUFFER_BIT);

    GLES30.glUniform1f ( mProgram2.mUniform[0] , n );

    GLES30.glUniform2f ( mProgram2.mUniform[1] , corrW, corrH );

    GLES30.glUniform1i ( mProgram2.mUniform[2] , 0 );

    GLES30.glUniform1fv( mProgram2.mUniform[3] , radius+1, mOffsets,0);

    GLES30.glUniform1fv( mProgram2.mUniform[4] , radius+1, weightsCache,offset);

    GLES30.glUniform1i ( mProgram2.mUniform[5] , radius);

    GLES30.glVertexAttribPointer(mProgram2.mAttribute[0], POS_DATA_SIZE, GLES30.GL_FLOAT, false, 0, mQuadPositions);

    GLES30.glVertexAttribPointer(mProgram2.mAttribute[1], TEX_DATA_SIZE, GLES30.GL_FLOAT, false, 0, mQuadTexture);

    GLES30.glDrawArrays(GLES30.GL_TRIANGLE_STRIP, 0, 4);

    InternalRenderState.unuseStencilMark();

    return 2;

    }

    final String blurVertex =

      "precision lowp float;  \n"+

      "in vec2 a_Position;    \n"+

      "in vec2 a_TexCoord;    \n"+

      "out vec2 v_TexCoord;   \n"+

      "uniform float u_Depth; \n"+

      "uniform vec2 u_TexCorr;\n"+

      "void main()                                      \n"+

      "  {                                              \n"+

      "  v_TexCoord = a_TexCoord * u_TexCorr;           \n"+

      "  gl_Position= vec4(2.0*a_Position,u_Depth,1.0); \n"+

      "  }";

    final String blurFragment1 =

      "#define MAX_BLUR "+MAX_RADIUS+    "\n"+

      "precision lowp float;              \n"+

      "in vec2 v_TexCoord;                \n"+

      "out vec4 fragColor;                \n"+

      "uniform sampler2D u_ColorTexture;  \n"+

      "uniform float u_Offsets[MAX_BLUR]; \n"+

      "uniform float u_Weights[MAX_BLUR]; \n"+

      "uniform int u_Radius;              \n"+

      "void main()                                                                                           \n"+

      "  {                                                                                                   \n"+

      "  vec4 pixel= texture(u_ColorTexture,v_TexCoord) * u_Weights[0];                                      \n"+

      "  for (int i=1; i<=u_Radius; i+=1)                                                                    \n"+

      "    {                                                                                                 \n"+

      "    pixel += ( texture(u_ColorTexture,vec2(v_TexCoord.x+u_Offsets[i],v_TexCoord.y)) +                 \n"+

      "               texture(u_ColorTexture,vec2(v_TexCoord.x-u_Offsets[i],v_TexCoord.y)) ) * u_Weights[i]; \n"+

      "    }                                                                                                 \n"+

      "  fragColor = pixel;                                                                                  \n"+

      "  }";

    final String blurFragment2 =

      "#define MAX_BLUR "+MAX_RADIUS+    "\n"+

      "precision lowp float;              \n"+

      "in vec2 v_TexCoord;                \n"+

      "out vec4 fragColor;                \n"+

      "uniform sampler2D u_ColorTexture;  \n"+

      "uniform float u_Offsets[MAX_BLUR]; \n"+

      "uniform float u_Weights[MAX_BLUR]; \n"+

      "uniform int u_Radius;              \n"+

      "void main()                                                                                           \n"+

      "  {                                                                                                   \n"+

      "  vec4 pixel= texture(u_ColorTexture,v_TexCoord) * u_Weights[0];                                      \n"+

      "  for (int i=1; i<=u_Radius; i+=1)                                                                    \n"+

      "    {                                                                                                 \n"+

      "    pixel += ( texture(u_ColorTexture,vec2(v_TexCoord.x,v_TexCoord.y+u_Offsets[i])) +                 \n"+

      "               texture(u_ColorTexture,vec2(v_TexCoord.x,v_TexCoord.y-u_Offsets[i])) ) * u_Weights[i]; \n"+

      "    }                                                                                                 \n"+

      "  fragColor = pixel;                                                                                  \n"+

      "  }";

    mIndex1 = PostprocessEffect.register("BLUR1", blurVertex,blurFragment1);

    mIndex2 = PostprocessEffect.register("BLUR2", blurVertex,blurFragment2);

 * @param blurHaloAndRadius First float: the halo.

 *                          How far beyond the object does the effect stretch to? Unit: Percentage

 *                          of the size of the original object, i.e. Halo=0 --> no halo around, this

 *                          would mean sharp edges around the object; Halo=100 --> halo of the size

 *                          of the object itself around (in case of blur, this would be - in vast

 *                          majority of cases except an object rendered very closely to the near plane-

 *                          an overkill).

 *                          Second float: the radius.

 *                          The 'strength' if the blur of the edges, in pixels. 0 = no blur, 10 =

 *                          blur of roughly 10 pixels around the whole halo.

  public PostprocessEffectBlur(Data2D blurHaloAndRadius)

    mBlurHaloAndRadius = blurHaloAndRadius;