//This file is automatically rebuilt by the Cesium build process.
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export default "uniform sampler2D colorTexture;\n\
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uniform float gradations;\n\
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\n\
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varying vec2 v_textureCoordinates;\n\
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\n\
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void main(void)\n\
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{\n\
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vec3 rgb = texture2D(colorTexture, v_textureCoordinates).rgb;\n\
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#ifdef CZM_SELECTED_FEATURE\n\
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if (czm_selected()) {\n\
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gl_FragColor = vec4(rgb, 1.0);\n\
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return;\n\
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}\n\
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#endif\n\
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float luminance = czm_luminance(rgb);\n\
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float darkness = luminance * gradations;\n\
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darkness = (darkness - fract(darkness)) / gradations;\n\
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gl_FragColor = vec4(vec3(darkness), 1.0);\n\
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}\n\
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";
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