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- //This file is automatically rebuilt by the Cesium build process.
- export default "uniform sampler2D colorTexture;\n\
- uniform float avgLuminance;\n\
- uniform float threshold;\n\
- uniform float offset;\n\
- varying vec2 v_textureCoordinates;\n\
- float key(float avg)\n\
- {\n\
- float guess = 1.5 - (1.5 / (avg * 0.1 + 1.0));\n\
- return max(0.0, guess) + 0.1;\n\
- }\n\
- void main()\n\
- {\n\
- vec4 color = texture2D(colorTexture, v_textureCoordinates);\n\
- vec3 xyz = czm_RGBToXYZ(color.rgb);\n\
- float luminance = xyz.r;\n\
- float scaledLum = key(avgLuminance) * luminance / avgLuminance;\n\
- float brightLum = max(scaledLum - threshold, 0.0);\n\
- float brightness = brightLum / (offset + brightLum);\n\
- xyz.r = brightness;\n\
- gl_FragColor = vec4(czm_XYZToRGB(xyz), 1.0);\n\
- }\n\
- ";
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