package com.marshalchen.common.uimodule.imageprocessing.filter.blend;
import com.marshalchen.common.uimodule.imageprocessing.filter.MultiInputFilter;
/**
* Applies a hard light blend of two images
* @author Chris Batt
*/
public class HardLightBlendFilter extends MultiInputFilter {
public HardLightBlendFilter() {
super(2);
}
@Override
protected String getFragmentShader() {
return
"precision mediump float;\n"
+"uniform sampler2D "+UNIFORM_TEXTURE0+";\n"
+"uniform sampler2D "+UNIFORM_TEXTUREBASE+1+";\n"
+"varying vec2 "+VARYING_TEXCOORD+";\n"
+"void main(){\n"
+" vec4 color1 = texture2D("+UNIFORM_TEXTURE0+","+VARYING_TEXCOORD+");\n"
+" vec4 color2 = texture2D("+UNIFORM_TEXTUREBASE+1+","+VARYING_TEXCOORD+");\n"
+" float r;\n"
+" if (2.0 * color2.r < color2.a) {\n"
+" r = 2.0 * color2.r * color1.r + color2.r * (1.0 - color1.a) + color1.r * (1.0 - color2.a);\n"
+" } else {\n"
+" r = color2.a * color1.a - 2.0 * (color1.a - color1.r) * (color2.a - color2.r) + color2.r * (1.0 - color1.a) + color1.r * (1.0 - color2.a);\n"
+" }\n"
+" float g;\n"
+" if (2.0 * color2.g < color2.a) {\n"
+" g = 2.0 * color2.g * color1.g + color2.g * (1.0 - color1.a) + color1.g * (1.0 - color2.a);\n"
+" } else {\n"
+" g = color2.a * color1.a - 2.0 * (color1.a - color1.g) * (color2.a - color2.g) + color2.g * (1.0 - color1.a) + color1.g * (1.0 - color2.a);\n"
+" }\n"
+" float b;\n"
+" if (2.0 * color2.b < color2.a) {\n"
+" b = 2.0 * color2.b * color1.b + color2.b * (1.0 - color1.a) + color1.b * (1.0 - color2.a);\n"
+" } else {\n"
+" b = color2.a * color1.a - 2.0 * (color1.a - color1.b) * (color2.a - color2.b) + color2.b * (1.0 - color1.a) + color1.b * (1.0 - color2.a);\n"
+" }\n"
+" gl_FragColor = vec4(r, g, b, 1.0);\n"
+"}\n";
}
}