//This file is automatically rebuilt by the Cesium build process.
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export default "void clipLineSegmentToNearPlane(\n\
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vec3 p0,\n\
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vec3 p1,\n\
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out vec4 positionWC,\n\
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out bool clipped,\n\
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out bool culledByNearPlane,\n\
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out vec4 clippedPositionEC)\n\
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{\n\
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culledByNearPlane = false;\n\
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clipped = false;\n\
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\n\
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vec3 p1ToP0 = p1 - p0;\n\
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float magnitude = length(p1ToP0);\n\
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vec3 direction = normalize(p1ToP0);\n\
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float endPoint0Distance = -(czm_currentFrustum.x + p0.z);\n\
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float denominator = -direction.z;\n\
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\n\
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if (endPoint0Distance < 0.0 && abs(denominator) < czm_epsilon7)\n\
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{\n\
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culledByNearPlane = true;\n\
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}\n\
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else if (endPoint0Distance < 0.0)\n\
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{\n\
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// t = (-plane distance - dot(plane normal, ray origin)) / dot(plane normal, ray direction)\n\
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float t = (czm_currentFrustum.x + p0.z) / denominator;\n\
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if (t < 0.0 || t > magnitude)\n\
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{\n\
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culledByNearPlane = true;\n\
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}\n\
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else\n\
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{\n\
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p0 = p0 + t * direction;\n\
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clipped = true;\n\
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}\n\
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}\n\
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\n\
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clippedPositionEC = vec4(p0, 1.0);\n\
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positionWC = czm_eyeToWindowCoordinates(clippedPositionEC);\n\
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}\n\
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\n\
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vec4 getPolylineWindowCoordinatesEC(vec4 positionEC, vec4 prevEC, vec4 nextEC, float expandDirection, float width, bool usePrevious, out float angle)\n\
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{\n\
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vec4 endPointWC, p0, p1;\n\
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bool culledByNearPlane, clipped;\n\
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\n\
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#ifdef POLYLINE_DASH\n\
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// Compute the window coordinates of the points.\n\
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vec4 positionWindow = czm_eyeToWindowCoordinates(positionEC);\n\
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vec4 previousWindow = czm_eyeToWindowCoordinates(prevEC);\n\
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vec4 nextWindow = czm_eyeToWindowCoordinates(nextEC);\n\
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\n\
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// Determine the relative screen space direction of the line.\n\
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vec2 lineDir;\n\
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if (usePrevious) {\n\
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lineDir = normalize(positionWindow.xy - previousWindow.xy);\n\
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}\n\
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else {\n\
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lineDir = normalize(nextWindow.xy - positionWindow.xy);\n\
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}\n\
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angle = atan(lineDir.x, lineDir.y) - 1.570796327; // precomputed atan(1,0)\n\
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\n\
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// Quantize the angle so it doesn't change rapidly between segments.\n\
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angle = floor(angle / czm_piOverFour + 0.5) * czm_piOverFour;\n\
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#endif\n\
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\n\
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vec4 clippedPositionEC;\n\
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clipLineSegmentToNearPlane(prevEC.xyz, positionEC.xyz, p0, clipped, culledByNearPlane, clippedPositionEC);\n\
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clipLineSegmentToNearPlane(nextEC.xyz, positionEC.xyz, p1, clipped, culledByNearPlane, clippedPositionEC);\n\
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clipLineSegmentToNearPlane(positionEC.xyz, usePrevious ? prevEC.xyz : nextEC.xyz, endPointWC, clipped, culledByNearPlane, clippedPositionEC);\n\
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\n\
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#ifdef LOG_DEPTH\n\
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czm_vertexLogDepth(czm_projection * clippedPositionEC);\n\
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#endif\n\
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\n\
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if (culledByNearPlane)\n\
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{\n\
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return vec4(0.0, 0.0, 0.0, 1.0);\n\
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}\n\
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\n\
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vec2 prevWC = normalize(p0.xy - endPointWC.xy);\n\
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vec2 nextWC = normalize(p1.xy - endPointWC.xy);\n\
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\n\
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float expandWidth = width * 0.5;\n\
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vec2 direction;\n\
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\n\
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#ifdef CLIP_POLYLINE\n\
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if (clipped)\n\
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{\n\
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if (prevEC.z - positionEC.z < 0.0)\n\
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{\n\
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direction = vec2(prevWC.y, -prevWC.x);\n\
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}\n\
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else\n\
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{\n\
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direction = vec2(-prevWC.y, prevWC.x);\n\
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}\n\
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}\n\
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else\n\
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#endif\n\
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if (czm_equalsEpsilon(prevEC.xyz - positionEC.xyz, vec3(0.0), czm_epsilon1) || czm_equalsEpsilon(prevWC, -nextWC, czm_epsilon1))\n\
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{\n\
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direction = vec2(-nextWC.y, nextWC.x);\n\
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}\n\
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else if (czm_equalsEpsilon(nextEC.xyz - positionEC.xyz, vec3(0.0), czm_epsilon1))\n\
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{\n\
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direction = vec2(prevWC.y, -prevWC.x);\n\
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}\n\
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else\n\
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{\n\
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vec2 normal = vec2(-nextWC.y, nextWC.x);\n\
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direction = normalize((nextWC + prevWC) * 0.5);\n\
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if (dot(direction, normal) < 0.0)\n\
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{\n\
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direction = -direction;\n\
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}\n\
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\n\
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// The sine of the angle between the two vectors is given by the formula\n\
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// |a x b| = |a||b|sin(theta)\n\
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// which is\n\
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// float sinAngle = length(cross(vec3(direction, 0.0), vec3(nextWC, 0.0)));\n\
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// Because the z components of both vectors are zero, the x and y coordinate will be zero.\n\
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// Therefore, the sine of the angle is just the z component of the cross product.\n\
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float sinAngle = abs(direction.x * nextWC.y - direction.y * nextWC.x);\n\
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expandWidth = clamp(expandWidth / sinAngle, 0.0, width * 2.0);\n\
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}\n\
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\n\
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vec2 offset = direction * expandDirection * expandWidth * czm_pixelRatio;\n\
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return vec4(endPointWC.xy + offset, -endPointWC.z, 1.0);\n\
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}\n\
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\n\
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vec4 getPolylineWindowCoordinates(vec4 position, vec4 previous, vec4 next, float expandDirection, float width, bool usePrevious, out float angle)\n\
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{\n\
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vec4 positionEC = czm_modelViewRelativeToEye * position;\n\
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vec4 prevEC = czm_modelViewRelativeToEye * previous;\n\
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vec4 nextEC = czm_modelViewRelativeToEye * next;\n\
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return getPolylineWindowCoordinatesEC(positionEC, prevEC, nextEC, expandDirection, width, usePrevious, angle);\n\
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}\n\
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";
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