Android Open Source - FxCameraApp Gl X Y Derivative Shader

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License

The source code is released under:

MIT License

Java Source Code

package com.af.experiments.FxCameraApp.shaders;
/*w w  w  . j a  va 2s .  c  om*/
public class GlXYDerivativeShader extends GlSobelEdgeDetectionShader {

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

      "uniform lowp sampler2D sTexture;\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" +
        "float topIntensity      = texture2D(sTexture, topTextureCoordinate).r;" +
        "float topRightIntensity = texture2D(sTexture, topRightTextureCoordinate).r;" +
        "float topLeftIntensity  = texture2D(sTexture, topLeftTextureCoordinate).r;" +
        "float bottomIntensity      = texture2D(sTexture, bottomTextureCoordinate).r;" +
        "float bottomLeftIntensity  = texture2D(sTexture, bottomLeftTextureCoordinate).r;" +
        "float bottomRightIntensity = texture2D(sTexture, bottomRightTextureCoordinate).r;" +
        "float leftIntensity  = texture2D(sTexture, leftTextureCoordinate).r;" +
        "float rightIntensity = texture2D(sTexture, rightTextureCoordinate).r;" +

        "float verticalDerivative = -topLeftIntensity - topIntensity - topRightIntensity + bottomLeftIntensity + bottomIntensity + bottomRightIntensity;" +
        "float horizontalDerivative = -bottomLeftIntensity - leftIntensity - topLeftIntensity + bottomRightIntensity + rightIntensity + topRightIntensity;" +
//        "float verticalDerivative = -topIntensity + bottomIntensity;" +
//        "float horizontalDerivative = -leftIntensity + rightIntensity;" +

        // Scaling the X * Y operation so that negative numbers are not clipped in the 0..1 range. This will be expanded in the corner detection filter
        "gl_FragColor = vec4(horizontalDerivative * horizontalDerivative, verticalDerivative * verticalDerivative, ((verticalDerivative * horizontalDerivative) + 1.0) / 2.0, 1.0);" +
      "}";

  protected String mShaderName = "Derivative";

  public String getName() {
    return mShaderName;
  }

  public GlXYDerivativeShader() {
    super(FRAGMENT_SHADER);
  }

}

Java Source Code List

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