Android Open Source - FxCameraApp Gl Threex3 Convolution Shader

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Back to project page FxCameraApp.

License

The source code is released under:

MIT License

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Java Source Code

package com.af.experiments.FxCameraApp.shaders;
/*  w  w  w .j a  v  a  2s.co  m*/
import static android.opengl.GLES20.glUniformMatrix3fv;

public class GlThreex3ConvolutionShader extends GlThreex3TextureSamplingShader {

  private static final String FRAGMENT_SHADER =
      "precision highp float;\n" +

      "uniform lowp sampler2D sTexture;\n" +
      "uniform mediump mat3 convolutionMatrix;\n" +

      "varying vec2 textureCoordinate;\n" +
      "varying vec2 leftTextureCoordinate;\n" +
      "varying vec2 rightTextureCoordinate;\n" +

      "varying vec2 topTextureCoordinate;\n" +
      "varying vec2 topLeftTextureCoordinate;\n" +
      "varying vec2 topRightTextureCoordinate;\n" +

      "varying vec2 bottomTextureCoordinate;\n" +
      "varying vec2 bottomLeftTextureCoordinate;\n" +
      "varying vec2 bottomRightTextureCoordinate;\n" +

      "void main() {\n" +
        "mediump vec4 bottomColor      = texture2D(sTexture, bottomTextureCoordinate);\n" +
        "mediump vec4 bottomLeftColor  = texture2D(sTexture, bottomLeftTextureCoordinate);\n" +
        "mediump vec4 bottomRightColor = texture2D(sTexture, bottomRightTextureCoordinate);\n" +

        "mediump vec4 centerColor = texture2D(sTexture, textureCoordinate);\n" +
        "mediump vec4 leftColor   = texture2D(sTexture, leftTextureCoordinate);\n" +
        "mediump vec4 rightColor  = texture2D(sTexture, rightTextureCoordinate);\n" +

        "mediump vec4 topColor      = texture2D(sTexture, topTextureCoordinate);\n" +
        "mediump vec4 topRightColor = texture2D(sTexture, topRightTextureCoordinate);\n" +
        "mediump vec4 topLeftColor  = texture2D(sTexture, topLeftTextureCoordinate);\n" +

        "mediump vec4 resultColor = topLeftColor * convolutionMatrix[0][0] + topColor * convolutionMatrix[0][1] + topRightColor * convolutionMatrix[0][2];\n" +
        "resultColor += leftColor * convolutionMatrix[1][0] + centerColor * convolutionMatrix[1][1] + rightColor * convolutionMatrix[1][2];\n" +
        "resultColor += bottomLeftColor * convolutionMatrix[2][0] + bottomColor * convolutionMatrix[2][1] + bottomRightColor * convolutionMatrix[2][2];\n" +
        "gl_FragColor = resultColor;\n" +
      "}";

  private static final float[] DEFAULT_CONVOLUTION_KERNEL = new float[] {
      0f, 0f, 0f,
      0f, 1f, 0f,
      0f, 0f, 0f
    };
  
  private float[] mConvolutionKernel;

  public GlThreex3ConvolutionShader() {
    this(DEFAULT_CONVOLUTION_KERNEL);
  }

  public GlThreex3ConvolutionShader(final float[] convolutionKernel) {
    super(FRAGMENT_SHADER);
    mConvolutionKernel = convolutionKernel;
  }


  public float[] getConvolutionKernel() {
    return mConvolutionKernel;
  }

  public void setConvolutionKernel(final float[] convolutionKernel) {
    mConvolutionKernel = convolutionKernel;
  }

  @Override
  public void onDraw() {
    super.onDraw();
    glUniformMatrix3fv(getHandle("convolutionMatrix"), 1, false, mConvolutionKernel, 0);
  }

}

Java Source Code List