49 lines
1.4 KiB
JavaScript
49 lines
1.4 KiB
JavaScript
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//This file is automatically rebuilt by the Cesium build process.
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define(function() {
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'use strict';
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return "#ifdef LOG_DEPTH\n\
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varying float v_logZ;\n\
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#endif\n\
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\n\
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/**\n\
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* Writes the fragment depth to the logarithmic depth buffer.\n\
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* <p>\n\
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* Use this when the vertex shader does not calls {@link czm_vertexlogDepth}, for example, when\n\
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* ray-casting geometry using a full screen quad.\n\
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* </p>\n\
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* @name czm_writeLogDepth\n\
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* @glslFunction\n\
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*\n\
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* @param {float} logZ The w coordinate of the vertex in clip coordinates plus 1.0.\n\
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*\n\
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* @example\n\
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* czm_writeLogDepth((czm_projection * v_positionEyeCoordinates).w + 1.0);\n\
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*/\n\
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void czm_writeLogDepth(float logZ)\n\
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{\n\
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#if defined(GL_EXT_frag_depth) && defined(LOG_DEPTH) && !defined(DISABLE_LOG_DEPTH_FRAGMENT_WRITE)\n\
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float halfLogFarDistance = czm_log2FarDistance * 0.5;\n\
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float depth = log2(logZ);\n\
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if (depth < czm_log2NearDistance) {\n\
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discard;\n\
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}\n\
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gl_FragDepthEXT = depth * halfLogFarDistance;\n\
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#endif\n\
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}\n\
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\n\
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/**\n\
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* Writes the fragment depth to the logarithmic depth buffer.\n\
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* <p>\n\
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* Use this when the vertex shader calls {@link czm_vertexlogDepth}.\n\
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* </p>\n\
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*\n\
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* @name czm_writeLogDepth\n\
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* @glslFunction\n\
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*/\n\
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void czm_writeLogDepth() {\n\
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#ifdef LOG_DEPTH\n\
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czm_writeLogDepth(v_logZ);\n\
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#endif\n\
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}\n\
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";
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});
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