Android Open Source - FxCameraApp Gl Box Blur 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;
//from w  ww.  j  a v a  2s .  c om
import static android.opengl.GLES20.glUniform1f;

public class GlBoxBlurShader extends GlShader {

  private static final String VERTEX_SHADER =
    "attribute vec4 aPosition;" +
    "attribute vec4 aTextureCoord;" +

    "uniform highp float texelWidthOffset;" +
    "uniform highp float texelHeightOffset;" +
    "uniform highp float blurSize;" +

    "varying highp vec2 centerTextureCoordinate;" +
    "varying highp vec2 oneStepLeftTextureCoordinate;" +
    "varying highp vec2 twoStepsLeftTextureCoordinate;" +
    "varying highp vec2 oneStepRightTextureCoordinate;" +
    "varying highp vec2 twoStepsRightTextureCoordinate;" +

    "void main() {" +
      "gl_Position = aPosition;" +

      "vec2 firstOffset = vec2(1.5 * texelWidthOffset, 1.5 * texelHeightOffset) * blurSize;" +
      "vec2 secondOffset = vec2(3.5 * texelWidthOffset, 3.5 * texelHeightOffset) * blurSize;" +

      "centerTextureCoordinate = aTextureCoord.xy;" +
      "oneStepLeftTextureCoordinate = centerTextureCoordinate - firstOffset;" +
      "twoStepsLeftTextureCoordinate = centerTextureCoordinate - secondOffset;" +
      "oneStepRightTextureCoordinate = centerTextureCoordinate + firstOffset;" +
      "twoStepsRightTextureCoordinate = centerTextureCoordinate + secondOffset;" +
    "}";

    private static final String FRAGMENT_SHADER =
      "precision mediump float;" +

      "uniform lowp sampler2D sTexture;" +

      "varying highp vec2 centerTextureCoordinate;" +
      "varying highp vec2 oneStepLeftTextureCoordinate;" +
      "varying highp vec2 twoStepsLeftTextureCoordinate;" +
      "varying highp vec2 oneStepRightTextureCoordinate;" +
      "varying highp vec2 twoStepsRightTextureCoordinate;" +

      "void main() {" +
        "lowp vec4 color = texture2D(sTexture, centerTextureCoordinate) * 0.2;" +
        "color += texture2D(sTexture, oneStepLeftTextureCoordinate) * 0.2;" +
        "color += texture2D(sTexture, oneStepRightTextureCoordinate) * 0.2;" +
        "color += texture2D(sTexture, twoStepsLeftTextureCoordinate) * 0.2;" +
        "color += texture2D(sTexture, twoStepsRightTextureCoordinate) * 0.2;" +
        "gl_FragColor = color;" +
      "}";

  private float mTexelWidthOffset = 0.003f;
  private float mTexelHeightOffset = 0.003f;
  private float mBlurSize = 1.0f;


  public GlBoxBlurShader() {
    super(VERTEX_SHADER, FRAGMENT_SHADER);
  }
  protected String mShaderName = "box blur";

  public String getName() {
    return mShaderName;
  }

  public float getTexelWidthOffset() {
    return mTexelWidthOffset;
  }

  public void setTexelWidthOffset(final float texelWidthOffset) {
    mTexelWidthOffset = texelWidthOffset;
  }

  public float getTexelHeightOffset() {
    return mTexelHeightOffset;
  }

  public void setTexelHeightOffset(final float texelHeightOffset) {
    mTexelHeightOffset = texelHeightOffset;
  }

  public float getBlurSize() {
    return mBlurSize;
  }

  public void setBlurSize(final float blurSize) {
    mBlurSize = blurSize;
  }


  @Override
  public void onDraw() {
    glUniform1f(getHandle("texelWidthOffset"), mTexelWidthOffset);
    glUniform1f(getHandle("texelHeightOffset"), mTexelHeightOffset);
    glUniform1f(getHandle("blurSize"), mBlurSize);
  }

}

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