//This file is automatically rebuilt by the Cesium build process.
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export default "#ifdef GL_EXT_frag_depth\n\
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#extension GL_EXT_frag_depth : enable\n\
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#endif\n\
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\n\
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varying vec4 v_startPlaneEC;\n\
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varying vec4 v_endPlaneEC;\n\
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varying vec4 v_rightPlaneEC;\n\
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varying float v_halfWidth;\n\
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varying vec3 v_volumeUpEC;\n\
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\n\
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uniform vec4 u_highlightColor;\n\
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void main()\n\
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{\n\
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float logDepthOrDepth = czm_branchFreeTernary(czm_sceneMode == czm_sceneMode2D, gl_FragCoord.z, czm_unpackDepth(texture2D(czm_globeDepthTexture, gl_FragCoord.xy / czm_viewport.zw)));\n\
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\n\
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// Discard for sky\n\
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if (logDepthOrDepth == 0.0) {\n\
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#ifdef DEBUG_SHOW_VOLUME\n\
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gl_FragColor = vec4(0.0, 0.0, 1.0, 0.5);\n\
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return;\n\
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#else // DEBUG_SHOW_VOLUME\n\
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discard;\n\
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#endif // DEBUG_SHOW_VOLUME\n\
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}\n\
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\n\
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vec4 eyeCoordinate = czm_windowToEyeCoordinates(gl_FragCoord.xy, logDepthOrDepth);\n\
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eyeCoordinate /= eyeCoordinate.w;\n\
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\n\
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float halfMaxWidth = v_halfWidth * czm_metersPerPixel(eyeCoordinate);\n\
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\n\
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// Expand halfMaxWidth if direction to camera is almost perpendicular with the volume's up direction\n\
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halfMaxWidth += halfMaxWidth * (1.0 - dot(-normalize(eyeCoordinate.xyz), v_volumeUpEC));\n\
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\n\
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// Check distance of the eye coordinate against the right-facing plane\n\
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float widthwiseDistance = czm_planeDistance(v_rightPlaneEC, eyeCoordinate.xyz);\n\
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\n\
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// Check eye coordinate against the mitering planes\n\
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float distanceFromStart = czm_planeDistance(v_startPlaneEC, eyeCoordinate.xyz);\n\
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float distanceFromEnd = czm_planeDistance(v_endPlaneEC, eyeCoordinate.xyz);\n\
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\n\
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if (abs(widthwiseDistance) > halfMaxWidth || distanceFromStart < 0.0 || distanceFromEnd < 0.0) {\n\
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#ifdef DEBUG_SHOW_VOLUME\n\
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gl_FragColor = vec4(logDepthOrDepth, 0.0, 0.0, 0.5);\n\
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return;\n\
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#else // DEBUG_SHOW_VOLUME\n\
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discard;\n\
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#endif // DEBUG_SHOW_VOLUME\n\
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}\n\
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gl_FragColor = u_highlightColor;\n\
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\n\
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czm_writeDepthClamp();\n\
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}\n\
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";
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