Android Open Source - FxCameraApp Gl Sphere Refraction 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 av a  2  s . c  om
import static android.opengl.GLES20.glUniform1f;
import static android.opengl.GLES20.glUniform2f;

public class GlSphereRefractionShader extends GlShader {

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

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

      "void main() {" +
        "highp vec2 textureCoordinateToUse = vec2(vTextureCoord.x, (vTextureCoord.y * aspectRatio + 0.5 - 0.5 * aspectRatio));" +
        "highp float distanceFromCenter = distance(center, textureCoordinateToUse);" +
        "lowp float checkForPresenceWithinSphere = step(distanceFromCenter, radius);" +

        "distanceFromCenter = distanceFromCenter / radius;" +

        "highp float normalizedDepth = radius * sqrt(1.0 - distanceFromCenter * distanceFromCenter);" +
        "highp vec3 sphereNormal = normalize(vec3(textureCoordinateToUse - center, normalizedDepth));" +

        "highp vec3 refractedVector = refract(vec3(0.0, 0.0, -1.0), sphereNormal, refractiveIndex);" +

        "gl_FragColor = texture2D(sTexture, (refractedVector.xy + 1.0) * 0.5) * checkForPresenceWithinSphere;" +
      "}";

  private float mCenterX = 0.5f;
  private float mCenterY = 0.5f;
  private float mRadius = 0.5f;//0.25f;
  private float mAspectRatio = 1.0f;
  private float mRefractiveIndex = 0.71f;

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

  protected String mShaderName = "Fish eye2";

  public String getName() {
    return mShaderName;
  }

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

  @Override
  public void onDraw() {
    glUniform2f(getHandle("center"), mCenterX, mCenterY);
    glUniform1f(getHandle("radius"), mRadius);
    glUniform1f(getHandle("aspectRatio"), mAspectRatio);
    glUniform1f(getHandle("refractiveIndex"), mRefractiveIndex);
  }

}

Java Source Code List

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