Android Open Source - FxCameraApp Gl Monochrome Shader

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From Project

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  a  v a  2 s. co m*/
import static android.opengl.GLES20.glUniform1f;
import static android.opengl.GLES20.glUniform3fv;

public class GlMonochromeShader extends GlShader {

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

      "varying highp vec2 vTextureCoord;" +
      "uniform lowp sampler2D sTexture;" +
      "uniform float intensity;" +
      "uniform vec3 filterColor;" +

      "const mediump vec3 luminanceWeighting = vec3(0.2125, 0.7154, 0.0721);" +

      "void main() {" +
        // desat, then apply overlay blend
        "lowp vec4 textureColor = texture2D(sTexture, vTextureCoord);" +
        "float luminance = dot(textureColor.rgb, luminanceWeighting);" +

        "lowp vec4 desat = vec4(vec3(luminance), 1.0);" +

        // overlay
        "lowp vec4 outputColor = vec4(" +
          "(desat.r < 0.5 ? (2.0 * desat.r * filterColor.r) : (1.0 - 2.0 * (1.0 - desat.r) * (1.0 - filterColor.r)))," +
          "(desat.g < 0.5 ? (2.0 * desat.g * filterColor.g) : (1.0 - 2.0 * (1.0 - desat.g) * (1.0 - filterColor.g)))," +
          "(desat.b < 0.5 ? (2.0 * desat.b * filterColor.b) : (1.0 - 2.0 * (1.0 - desat.b) * (1.0 - filterColor.b)))," +
          "1.0" +
        ");" +

        // which is better, or are they equal?
        "gl_FragColor = vec4(mix(textureColor.rgb, outputColor.rgb, intensity), textureColor.a);" +
      "}";

  private float mIntensity = 1.0f;
  private float[] mFilterColor = new float[]{ 0.6f, 0.45f, 0.3f };

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

  protected String mShaderName = "Noir";

  public String getName() {
    return mShaderName;
  }


  @Override
  public void onDraw() {
    glUniform1f(getHandle("intensity"), mIntensity);
    glUniform3fv(getHandle("filterColor"), 0, mFilterColor, 0);
  }

}

Java Source Code List

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