Android Open Source - FxCameraApp Gl Sharpen Shader

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Back to project page FxCameraApp.
License

The source code is released under:
MIT License
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Java Source Code

package com.af.experiments.FxCameraApp.shaders;
// w  ww  .  j  a  v  a2  s .  c  o m
import static android.opengl.GLES20.glUniform1f;

public class GlSharpenShader extends GlShader {

  private static final String VERTEX_SHADER =
    "attribute vec4 aPosition;" +
    "attribute vec4 aTextureCoord;" +

    "uniform float imageWidthFactor;" +
    "uniform float imageHeightFactor;" +
    "uniform float sharpness;" +

    "varying highp vec2 textureCoordinate;" +
    "varying highp vec2 leftTextureCoordinate;" +
    "varying highp vec2 rightTextureCoordinate;" +
    "varying highp vec2 topTextureCoordinate;" +
    "varying highp vec2 bottomTextureCoordinate;" +

    "varying float centerMultiplier;" +
    "varying float edgeMultiplier;" +

    "void main() {" +
      "gl_Position = aPosition;" +

      "mediump vec2 widthStep = vec2(imageWidthFactor, 0.0);" +
      "mediump vec2 heightStep = vec2(0.0, imageHeightFactor);" +

      "textureCoordinate       = aTextureCoord.xy;" +
      "leftTextureCoordinate   = textureCoordinate - widthStep;" +
      "rightTextureCoordinate  = textureCoordinate + widthStep;" +
      "topTextureCoordinate    = textureCoordinate + heightStep;" +
      "bottomTextureCoordinate = textureCoordinate - heightStep;" +

      "centerMultiplier = 1.0 + 4.0 * sharpness;" +
      "edgeMultiplier = sharpness;" +
    "}";

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

      "uniform lowp sampler2D sTexture;" +

      "varying highp vec2 textureCoordinate;" +
      "varying highp vec2 leftTextureCoordinate;" +
      "varying highp vec2 rightTextureCoordinate;" +
      "varying highp vec2 topTextureCoordinate;" +
      "varying highp vec2 bottomTextureCoordinate;" +

      "varying float centerMultiplier;" +
      "varying float edgeMultiplier;" +

      "void main() {" +
        "mediump vec3 textureColor       = texture2D(sTexture, textureCoordinate).rgb;" +
        "mediump vec3 leftTextureColor   = texture2D(sTexture, leftTextureCoordinate).rgb;" +
        "mediump vec3 rightTextureColor  = texture2D(sTexture, rightTextureCoordinate).rgb;" +
        "mediump vec3 topTextureColor    = texture2D(sTexture, topTextureCoordinate).rgb;" +
        "mediump vec3 bottomTextureColor = texture2D(sTexture, bottomTextureCoordinate).rgb;" +

        "gl_FragColor = vec4((textureColor * centerMultiplier - (leftTextureColor * edgeMultiplier + rightTextureColor * edgeMultiplier + topTextureColor * edgeMultiplier + bottomTextureColor * edgeMultiplier)), texture2D(sTexture, bottomTextureCoordinate).w);" +
      "}";

  private float mImageWidthFactor = 0.004f;
  private float mImageHeightFactor = 0.004f;
  private float mSharpness = 1.f;

  public GlSharpenShader() {
    super(VERTEX_SHADER, FRAGMENT_SHADER);
  }

  protected String mShaderName = "Sharpen";

  public String getName() {
    return mShaderName;
  }

  public float getSharpness() {
    return mSharpness;
  }

  public void setSharpness(final float sharpness) {
    mSharpness = sharpness;
  }


  @Override
  public void setFrameSize(final int width, final int height) {
    mImageWidthFactor = 1f / width;
    mImageHeightFactor = 1f / height;
  }

  @Override
  public void onDraw() {
    glUniform1f(getHandle("imageWidthFactor"), mImageWidthFactor);
    glUniform1f(getHandle("imageHeightFactor"), mImageHeightFactor);
    glUniform1f(getHandle("sharpness"), mSharpness);
  }

}
Java Source Code List
