Android Open Source - FxCameraApp Gl Pinch Distortion 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. ja va2s  .c  o m*/
import static android.opengl.GLES20.glUniform1f;
import static android.opengl.GLES20.glUniform2f;

public class GlPinchDistortionShader extends GlShader {

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

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

      "void main() {" +
        "highp vec2 textureCoordinateToUse = vTextureCoord;" +
        "highp float dist = distance(center, vTextureCoord);" +
        "textureCoordinateToUse -= center;" +
        "if (dist < radius) {" +
          "highp float percent = 1.0 + ((0.5 - dist) / 0.5) * scale;" +
          "textureCoordinateToUse = textureCoordinateToUse * percent;" +
        "}" +
        "textureCoordinateToUse += center;" +

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

  private float mCenterX = 0.5f;
  private float mCenterY = 0.5f;
  private float mRadius = 1.0f;
  private float mScale = 0.5f;

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

  protected String mShaderName = "Pinch";

  public String getName() {
    return mShaderName;
  }

  public float getCenterX() {
    return mCenterX;
  }

  public void setCenterX(final float centerX) {
    mCenterX = centerX;
  }

  public float getCenterY() {
    return mCenterY;
  }

  public void setCenterY(final float centerY) {
    mCenterY = centerY;
  }

  public float getRadius() {
    return mRadius;
  }

  public void setRadius(final float radius) {
    mRadius = radius;
  }

  public float getScale() {
    return mScale;
  }

  public void setScale(final float scale) {
    mScale = scale;
  }

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

  @Override
  public void onDraw() {
    glUniform2f(getHandle("center"), mCenterX, mCenterY);
    glUniform1f(getHandle("radius"), (float) Math.sin(System.currentTimeMillis()/100.f));
    glUniform1f(getHandle("scale"), mScale);
  }

}

Java Source Code List

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