Android Open Source - FxCameraApp Gl Polka Dot Shader

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License

The source code is released under:

MIT License

Java Source Code

package com.af.experiments.FxCameraApp.shaders;
//from w ww.  j a va2  s  .com
import static android.opengl.GLES20.glUniform1f;

public class GlPolkaDotShader extends GlShader {

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

      "varying vec2 vTextureCoord;" +
      "uniform lowp sampler2D sTexture;" +
      "uniform highp float fractionalWidthOfPixel;" +
      "uniform highp float aspectRatio;" +
      "uniform highp float dotScaling;" +

      "void main() {" +
        "highp vec2 sampleDivisor = vec2(fractionalWidthOfPixel, fractionalWidthOfPixel / aspectRatio);" +

        "highp vec2 samplePos = vTextureCoord - mod(vTextureCoord, sampleDivisor) + 0.5 * sampleDivisor;" +
        "highp vec2 textureCoordinateToUse = vec2(vTextureCoord.x, (vTextureCoord.y * aspectRatio + 0.5 - 0.5 * aspectRatio));" +
        "highp vec2 adjustedSamplePos = vec2(samplePos.x, (samplePos.y * aspectRatio + 0.5 - 0.5 * aspectRatio));" +
        "highp float distanceFromSamplePoint = distance(adjustedSamplePos, textureCoordinateToUse);" +
        "lowp float checkForPresenceWithinDot = step(distanceFromSamplePoint, (fractionalWidthOfPixel * 0.5) * dotScaling);" +

        "gl_FragColor = vec4(texture2D(sTexture, samplePos ).rgb * checkForPresenceWithinDot, 1.0);" +
      "}";

  private float mFractionalWidthOfPixel = 0.013f;
  private float mAspectRatio = 0.5f;
  private float mDotScaling = 0.90f;

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

  protected String mShaderName = "polka dot";

  public String getName() {
    return mShaderName;
  }


  public float getFractionalWidthOfPixel() {
    return mFractionalWidthOfPixel;
  }

  public void setFractionalWidthOfPixel(final float fractionalWidthOfPixel) {
    mFractionalWidthOfPixel = fractionalWidthOfPixel;
  }

  public float getAspectRatio() {
    return mAspectRatio;
  }

  public void setAspectRatio(final float aspectRatio) {
    mAspectRatio = aspectRatio;
  }

  public float getDotScaling() {
    return mDotScaling;
  }

  public void setDotScaling(final float dotScaling) {
    mDotScaling = dotScaling;
  }

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

  @Override
  public void onDraw() {
    glUniform1f(getHandle("fractionalWidthOfPixel"), mFractionalWidthOfPixel);
    glUniform1f(getHandle("aspectRatio"), mAspectRatio);
    glUniform1f(getHandle("dotScaling"), mDotScaling);
  }

}

Java Source Code List

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