Android Open Source - FxCameraApp Gl Stretch Distortion Shader

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License

The source code is released under:

MIT License

Java Source Code

package com.af.experiments.FxCameraApp.shaders;
/*  www.  java  2 s .  c  o m*/
import static android.opengl.GLES20.glUniform2f;

public class GlStretchDistortionShader extends GlShader {

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

      "varying vec2 vTextureCoord;" +
      "uniform lowp sampler2D sTexture;" +
      "uniform highp vec2 center;" +

      "void main() {" +
        "highp vec2 normCoord = 2.0 * vTextureCoord - 1.0;" +
        "highp vec2 normCenter = 2.0 * center - 1.0;" +

        "normCoord -= normCenter;" +
        "mediump vec2 s = sign(normCoord);" +
        "normCoord = abs(normCoord);" +
        "normCoord = 0.5 * normCoord + 0.5 * smoothstep(0.25, 0.5, normCoord) * normCoord;" +
        "normCoord = s * normCoord;" +

        "normCoord += normCenter;" +

        "mediump vec2 textureCoordinateToUse = normCoord / 2.0 + 0.5;" +

        "gl_FragColor = texture2D(sTexture, textureCoordinateToUse);" +
      "}";


  private float mCenterX = 0.5f;
  private float mCenterY = 0.5f;

  protected String mShaderName = "Stretch";

  public String getName() {
    return mShaderName;
  }

  public GlStretchDistortionShader() {
    super(DEFAULT_VERTEX_SHADER, FRAGMENT_SHADER);
  }

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

  @Override
  public void onDraw() {
    glUniform2f(getHandle("center"), mCenterX, mCenterY);
  }

}

Java Source Code List

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