//This file is automatically rebuilt by the Cesium build process.
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export default "#ifdef GL_OES_standard_derivatives\n\
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#extension GL_OES_standard_derivatives : enable\n\
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#endif\n\
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\n\
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uniform sampler2D u_atlas;\n\
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\n\
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#ifdef VECTOR_TILE\n\
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uniform vec4 u_highlightColor;\n\
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#endif\n\
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\n\
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varying vec2 v_textureCoordinates;\n\
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varying vec4 v_pickColor;\n\
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varying vec4 v_color;\n\
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\n\
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#ifdef SDF\n\
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varying vec4 v_outlineColor;\n\
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varying float v_outlineWidth;\n\
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#endif\n\
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\n\
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#ifdef FRAGMENT_DEPTH_CHECK\n\
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varying vec4 v_textureCoordinateBounds; // the min and max x and y values for the texture coordinates\n\
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varying vec4 v_originTextureCoordinateAndTranslate; // texture coordinate at the origin, billboard translate (used for label glyphs)\n\
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varying vec4 v_compressed; // x: eyeDepth, y: applyTranslate & enableDepthCheck, z: dimensions, w: imageSize\n\
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varying mat2 v_rotationMatrix;\n\
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\n\
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const float SHIFT_LEFT12 = 4096.0;\n\
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const float SHIFT_LEFT1 = 2.0;\n\
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\n\
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const float SHIFT_RIGHT12 = 1.0 / 4096.0;\n\
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const float SHIFT_RIGHT1 = 1.0 / 2.0;\n\
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\n\
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float getGlobeDepth(vec2 adjustedST, vec2 depthLookupST, bool applyTranslate, vec2 dimensions, vec2 imageSize)\n\
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{\n\
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vec2 lookupVector = imageSize * (depthLookupST - adjustedST);\n\
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lookupVector = v_rotationMatrix * lookupVector;\n\
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vec2 labelOffset = (dimensions - imageSize) * (depthLookupST - vec2(0.0, v_originTextureCoordinateAndTranslate.y)); // aligns label glyph with bounding rectangle. Will be zero for billboards because dimensions and imageSize will be equal\n\
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\n\
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vec2 translation = v_originTextureCoordinateAndTranslate.zw;\n\
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\n\
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if (applyTranslate)\n\
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{\n\
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// this is only needed for labels where the horizontal origin is not LEFT\n\
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// it moves the label back to where the \"origin\" should be since all label glyphs are set to HorizontalOrigin.LEFT\n\
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translation += (dimensions * v_originTextureCoordinateAndTranslate.xy * vec2(1.0, 0.0));\n\
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}\n\
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\n\
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vec2 st = ((lookupVector - translation + labelOffset) + gl_FragCoord.xy) / czm_viewport.zw;\n\
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float logDepthOrDepth = czm_unpackDepth(texture2D(czm_globeDepthTexture, st));\n\
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\n\
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if (logDepthOrDepth == 0.0)\n\
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{\n\
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return 0.0; // not on the globe\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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return eyeCoordinate.z / eyeCoordinate.w;\n\
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}\n\
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#endif\n\
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\n\
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\n\
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#ifdef SDF\n\
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\n\
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// Get the distance from the edge of a glyph at a given position sampling an SDF texture.\n\
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float getDistance(vec2 position)\n\
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{\n\
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return texture2D(u_atlas, position).r;\n\
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}\n\
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\n\
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// Samples the sdf texture at the given position and produces a color based on the fill color and the outline.\n\
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vec4 getSDFColor(vec2 position, float outlineWidth, vec4 outlineColor, float smoothing)\n\
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{\n\
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float distance = getDistance(position);\n\
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\n\
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if (outlineWidth > 0.0)\n\
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{\n\
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// Don't get the outline edge exceed the SDF_EDGE\n\
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float outlineEdge = clamp(SDF_EDGE - outlineWidth, 0.0, SDF_EDGE);\n\
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float outlineFactor = smoothstep(SDF_EDGE - smoothing, SDF_EDGE + smoothing, distance);\n\
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vec4 sdfColor = mix(outlineColor, v_color, outlineFactor);\n\
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float alpha = smoothstep(outlineEdge - smoothing, outlineEdge + smoothing, distance);\n\
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return vec4(sdfColor.rgb, sdfColor.a * alpha);\n\
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}\n\
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else\n\
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{\n\
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float alpha = smoothstep(SDF_EDGE - smoothing, SDF_EDGE + smoothing, distance);\n\
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return vec4(v_color.rgb, v_color.a * alpha);\n\
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}\n\
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}\n\
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#endif\n\
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\n\
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void main()\n\
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{\n\
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vec4 color = texture2D(u_atlas, v_textureCoordinates);\n\
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\n\
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#ifdef SDF\n\
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float outlineWidth = v_outlineWidth;\n\
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vec4 outlineColor = v_outlineColor;\n\
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\n\
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// Get the current distance\n\
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float distance = getDistance(v_textureCoordinates);\n\
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\n\
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#ifdef GL_OES_standard_derivatives\n\
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float smoothing = fwidth(distance);\n\
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// Get an offset that is approximately half the distance to the neighbor pixels\n\
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// 0.354 is approximately half of 1/sqrt(2)\n\
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vec2 sampleOffset = 0.354 * vec2(dFdx(v_textureCoordinates) + dFdy(v_textureCoordinates));\n\
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\n\
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// Sample the center point\n\
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vec4 center = getSDFColor(v_textureCoordinates, outlineWidth, outlineColor, smoothing);\n\
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\n\
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// Sample the 4 neighbors\n\
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vec4 color1 = getSDFColor(v_textureCoordinates + vec2(sampleOffset.x, sampleOffset.y), outlineWidth, outlineColor, smoothing);\n\
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vec4 color2 = getSDFColor(v_textureCoordinates + vec2(-sampleOffset.x, sampleOffset.y), outlineWidth, outlineColor, smoothing);\n\
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vec4 color3 = getSDFColor(v_textureCoordinates + vec2(-sampleOffset.x, -sampleOffset.y), outlineWidth, outlineColor, smoothing);\n\
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vec4 color4 = getSDFColor(v_textureCoordinates + vec2(sampleOffset.x, -sampleOffset.y), outlineWidth, outlineColor, smoothing);\n\
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\n\
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// Equally weight the center sample and the 4 neighboring samples\n\
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color = (center + color1 + color2 + color3 + color4)/5.0;\n\
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#else\n\
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// Just do a single sample\n\
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float smoothing = 1.0/32.0;\n\
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color = getSDFColor(v_textureCoordinates, outlineWidth, outlineColor, smoothing);\n\
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#endif\n\
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\n\
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color = czm_gammaCorrect(color);\n\
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#else\n\
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color = czm_gammaCorrect(color);\n\
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color *= czm_gammaCorrect(v_color);\n\
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#endif\n\
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\n\
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// Fully transparent parts of the billboard are not pickable.\n\
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#if !defined(OPAQUE) && !defined(TRANSLUCENT)\n\
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if (color.a < 0.005) // matches 0/255 and 1/255\n\
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{\n\
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discard;\n\
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}\n\
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#else\n\
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// The billboard is rendered twice. The opaque pass discards translucent fragments\n\
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// and the translucent pass discards opaque fragments.\n\
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#ifdef OPAQUE\n\
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if (color.a < 0.995) // matches < 254/255\n\
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{\n\
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discard;\n\
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}\n\
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#else\n\
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if (color.a >= 0.995) // matches 254/255 and 255/255\n\
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{\n\
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discard;\n\
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}\n\
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#endif\n\
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#endif\n\
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\n\
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#ifdef VECTOR_TILE\n\
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color *= u_highlightColor;\n\
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#endif\n\
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gl_FragColor = color;\n\
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\n\
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#ifdef LOG_DEPTH\n\
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czm_writeLogDepth();\n\
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#endif\n\
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\n\
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#ifdef FRAGMENT_DEPTH_CHECK\n\
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float temp = v_compressed.y;\n\
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\n\
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temp = temp * SHIFT_RIGHT1;\n\
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\n\
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float temp2 = (temp - floor(temp)) * SHIFT_LEFT1;\n\
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bool enableDepthTest = temp2 != 0.0;\n\
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bool applyTranslate = floor(temp) != 0.0;\n\
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\n\
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if (enableDepthTest) {\n\
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temp = v_compressed.z;\n\
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temp = temp * SHIFT_RIGHT12;\n\
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\n\
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vec2 dimensions;\n\
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dimensions.y = (temp - floor(temp)) * SHIFT_LEFT12;\n\
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dimensions.x = floor(temp);\n\
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\n\
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temp = v_compressed.w;\n\
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temp = temp * SHIFT_RIGHT12;\n\
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\n\
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vec2 imageSize;\n\
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imageSize.y = (temp - floor(temp)) * SHIFT_LEFT12;\n\
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imageSize.x = floor(temp);\n\
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\n\
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vec2 adjustedST = v_textureCoordinates - v_textureCoordinateBounds.xy;\n\
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adjustedST = adjustedST / vec2(v_textureCoordinateBounds.z - v_textureCoordinateBounds.x, v_textureCoordinateBounds.w - v_textureCoordinateBounds.y);\n\
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\n\
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float epsilonEyeDepth = v_compressed.x + czm_epsilon1;\n\
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float globeDepth1 = getGlobeDepth(adjustedST, v_originTextureCoordinateAndTranslate.xy, applyTranslate, dimensions, imageSize);\n\
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\n\
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// negative values go into the screen\n\
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if (globeDepth1 != 0.0 && globeDepth1 > epsilonEyeDepth)\n\
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{\n\
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float globeDepth2 = getGlobeDepth(adjustedST, vec2(0.0, 1.0), applyTranslate, dimensions, imageSize); // top left corner\n\
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if (globeDepth2 != 0.0 && globeDepth2 > epsilonEyeDepth)\n\
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{\n\
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float globeDepth3 = getGlobeDepth(adjustedST, vec2(1.0, 1.0), applyTranslate, dimensions, imageSize); // top right corner\n\
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if (globeDepth3 != 0.0 && globeDepth3 > epsilonEyeDepth)\n\
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{\n\
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discard;\n\
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}\n\
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}\n\
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}\n\
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}\n\
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#endif\n\
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\n\
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}\n\
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";
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