Android Open Source - FxCameraApp Gl White Balance Shader

• Back to Camera/effect  ↑

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;
//  w ww  .  ja v a  2s.  co m
import static android.opengl.GLES20.glUniform1f;

public class GlWhiteBalanceShader extends GlShader {

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

      "varying vec2 vTextureCoord;" +
      "uniform lowp sampler2D sTexture;" +
      "uniform lowp float temperature;" +
      "uniform lowp float tint;" +

      "const lowp vec3 warmFilter = vec3(0.93, 0.54, 0.0);" +

      "const mediump mat3 RGBtoYIQ = mat3(0.299, 0.587, 0.114, 0.596, -0.274, -0.322, 0.212, -0.523, 0.311);" +
      "const mediump mat3 YIQtoRGB = mat3(1.0, 0.956, 0.621, 1.0, -0.272, -0.647, 1.0, -1.105, 1.702);" +

      "void main() {" +
        "lowp vec4 source = texture2D(sTexture, vTextureCoord);" +

        "mediump vec3 yiq = RGBtoYIQ * source.rgb;" +  // adjusting tint
        "yiq.b = clamp(yiq.b + tint*0.5226*0.1, -0.5226, 0.5226);" +
        "lowp vec3 rgb = YIQtoRGB * yiq;" +

        "lowp vec3 processed = vec3(" +
          "(rgb.r < 0.5 ? (2.0 * rgb.r * warmFilter.r) : (1.0 - 2.0 * (1.0 - rgb.r) * (1.0 - warmFilter.r)))," +  // adjusting temperature
          "(rgb.g < 0.5 ? (2.0 * rgb.g * warmFilter.g) : (1.0 - 2.0 * (1.0 - rgb.g) * (1.0 - warmFilter.g)))," +
          "(rgb.b < 0.5 ? (2.0 * rgb.b * warmFilter.b) : (1.0 - 2.0 * (1.0 - rgb.b) * (1.0 - warmFilter.b))));" +

        "gl_FragColor = vec4(mix(rgb, processed, temperature), source.a);" +
      "}";

  private float mTemperature = 5000f;
  private float mTint;

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


  public float getTemperature() {
    return mTemperature;
  }

  public void setTemperature(final float temperature) {
    mTemperature = temperature;
  }

  public float getTint() {
    return mTint;
  }

  public void setTint(final float tint) {
    mTint = tint;
  }

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

  @Override
  public void onDraw() {
    glUniform1f(getHandle("temperature"), mTemperature);
    glUniform1f(getHandle("tint"), mTint);
  }

}

Java Source Code List

• Back to Camera/effect  ↑