Android Open Source - FxCameraApp Gl Vignette Shader

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Back to project page FxCameraApp.

License

The source code is released under:

MIT License

Java Source Code

package com.af.experiments.FxCameraApp.shaders;
//from   www .j  ava  2 s .com
import static android.opengl.GLES20.glUniform1f;
import static android.opengl.GLES20.glUniform2f;
import static android.opengl.GLES20.glUniform3fv;

public class GlVignetteShader extends GlShader {

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

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

      "uniform lowp vec2 vignetteCenter;" +
      "uniform lowp vec3 vignetteColor;" +
      "uniform highp float vignetteStart;" +
      "uniform highp float vignetteEnd;" +

      "void main() {" +
        "lowp vec3 rgb = texture2D(sTexture, vTextureCoord).rgb;" +
        "lowp float d = distance(vTextureCoord, vec2(vignetteCenter.x, vignetteCenter.y));" +
        "lowp float percent = smoothstep(vignetteStart, vignetteEnd, d);" +
        "gl_FragColor = vec4(mix(rgb.x, vignetteColor.x, percent), mix(rgb.y, vignetteColor.y, percent), mix(rgb.z, vignetteColor.z, percent), 1.0);" +
      "}";

  private float mVignetteCenterX = 0.5f;
  private float mVignetteCenterY = 0.5f;
  private float[] mVignetteColor = new float[]{ 0f, 0f, 0f };
  private float mVignetteStart = 0.2f;
  private float mVignetteEnd = 0.85f;

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


  public float getVignetteStart() {
    return mVignetteStart;
  }

  public void setVignetteStart(final float vignetteStart) {
    mVignetteStart = vignetteStart;
  }

  public float getVignetteEnd() {
    return mVignetteEnd;
  }

  public void setVignetteEnd(final float vignetteEnd) {
    mVignetteEnd = vignetteEnd;
  }

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

  @Override
  public void onDraw() {
    glUniform2f(getHandle("vignetteCenter"), mVignetteCenterX, mVignetteCenterY);
    glUniform3fv(getHandle("vignetteColor"), 0, mVignetteColor, 0);
    glUniform1f(getHandle("vignetteStart"), mVignetteStart);
    glUniform1f(getHandle("vignetteEnd"), mVignetteEnd);
  }

}

Java Source Code List

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