GlWeakPixelInclusionShader.java

package com.af.experiments.FxCameraApp.shaders;

public class GlWeakPixelInclusionShader extends GlThreex3TextureSamplingShader {

	private static final String FRAGMENT_SHADER =
			"precision lowp float;\n" +

			"uniform lowp sampler2D sTexture;\n" +

			"varying vec2 textureCoordinate;\n" +
			"varying vec2 leftTextureCoordinate;\n" +
			"varying vec2 rightTextureCoordinate;\n" +

			"varying vec2 topTextureCoordinate;\n" +
			"varying vec2 topLeftTextureCoordinate;\n" +
			"varying vec2 topRightTextureCoordinate;\n" +

			"varying vec2 bottomTextureCoordinate;\n" +
			"varying vec2 bottomLeftTextureCoordinate;\n" +
			"varying vec2 bottomRightTextureCoordinate;\n" +

			"void main() {\n" +
				"float bottomLeftIntensity = texture2D(sTexture, bottomLeftTextureCoordinate).r;" +
				"float topRightIntensity = texture2D(sTexture, topRightTextureCoordinate).r;" +
				"float topLeftIntensity = texture2D(sTexture, topLeftTextureCoordinate).r;" +
				"float bottomRightIntensity = texture2D(sTexture, bottomRightTextureCoordinate).r;" +
				"float leftIntensity = texture2D(sTexture, leftTextureCoordinate).r;" +
				"float rightIntensity = texture2D(sTexture, rightTextureCoordinate).r;" +
				"float bottomIntensity = texture2D(sTexture, bottomTextureCoordinate).r;" +
				"float topIntensity = texture2D(sTexture, topTextureCoordinate).r;" +
				"float centerIntensity = texture2D(sTexture, textureCoordinate).r;" +

				"float pixelIntensitySum = bottomLeftIntensity + topRightIntensity + topLeftIntensity + bottomRightIntensity + leftIntensity + rightIntensity + bottomIntensity + topIntensity + centerIntensity;" +
				"float sumTest = step(1.5, pixelIntensitySum);" +
				"float pixelTest = step(0.01, centerIntensity);" +

				"gl_FragColor = vec4(vec3(sumTest * pixelTest), 1.0);" +
			"}";

	public GlWeakPixelInclusionShader() {
		super(FRAGMENT_SHADER);
	}

}