uniform sampler2D colorTexture;
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varying vec2 v_textureCoordinates;
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#ifdef AUTO_EXPOSURE
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uniform sampler2D autoExposure;
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#endif
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// See slides 142 and 143:
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// http://www.gdcvault.com/play/1012459/Uncharted_2__HDR_Lighting
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void main()
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{
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vec4 fragmentColor = texture2D(colorTexture, v_textureCoordinates);
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vec3 color = fragmentColor.rgb;
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#ifdef AUTO_EXPOSURE
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float exposure = texture2D(autoExposure, vec2(0.5)).r;
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color /= exposure;
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#endif
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const float A = 0.22; // shoulder strength
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const float B = 0.30; // linear strength
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const float C = 0.10; // linear angle
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const float D = 0.20; // toe strength
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const float E = 0.01; // toe numerator
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const float F = 0.30; // toe denominator
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const float white = 11.2; // linear white point value
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vec3 c = ((color * (A * color + C * B) + D * E) / (color * ( A * color + B) + D * F)) - E / F;
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float w = ((white * (A * white + C * B) + D * E) / (white * ( A * white + B) + D * F)) - E / F;
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c = czm_inverseGamma(c / w);
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gl_FragColor = vec4(c, fragmentColor.a);
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}
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