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115 lines
4.5 KiB
JavaScript
115 lines
4.5 KiB
JavaScript
//This file is automatically rebuilt by the Cesium build process.
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export default "#ifdef WRITE_DEPTH\n\
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#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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#endif\n\
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\n\
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uniform vec3 u_radii;\n\
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uniform vec3 u_oneOverEllipsoidRadiiSquared;\n\
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\n\
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varying vec3 v_positionEC;\n\
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\n\
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vec4 computeEllipsoidColor(czm_ray ray, float intersection, float side)\n\
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{\n\
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vec3 positionEC = czm_pointAlongRay(ray, intersection);\n\
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vec3 positionMC = (czm_inverseModelView * vec4(positionEC, 1.0)).xyz;\n\
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vec3 geodeticNormal = normalize(czm_geodeticSurfaceNormal(positionMC, vec3(0.0), u_oneOverEllipsoidRadiiSquared));\n\
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vec3 sphericalNormal = normalize(positionMC / u_radii);\n\
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vec3 normalMC = geodeticNormal * side; // normalized surface normal (always facing the viewer) in model coordinates\n\
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vec3 normalEC = normalize(czm_normal * normalMC); // normalized surface normal in eye coordiantes\n\
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\n\
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vec2 st = czm_ellipsoidWgs84TextureCoordinates(sphericalNormal);\n\
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vec3 positionToEyeEC = -positionEC;\n\
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\n\
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czm_materialInput materialInput;\n\
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materialInput.s = st.s;\n\
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materialInput.st = st;\n\
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materialInput.str = (positionMC + u_radii) / u_radii;\n\
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materialInput.normalEC = normalEC;\n\
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materialInput.tangentToEyeMatrix = czm_eastNorthUpToEyeCoordinates(positionMC, normalEC);\n\
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materialInput.positionToEyeEC = positionToEyeEC;\n\
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czm_material material = czm_getMaterial(materialInput);\n\
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\n\
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#ifdef ONLY_SUN_LIGHTING\n\
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return czm_private_phong(normalize(positionToEyeEC), material, czm_sunDirectionEC);\n\
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#else\n\
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return czm_phong(normalize(positionToEyeEC), material, czm_lightDirectionEC);\n\
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#endif\n\
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}\n\
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\n\
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void main()\n\
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{\n\
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// PERFORMANCE_TODO: When dynamic branching is available, compute ratio of maximum and minimum radii\n\
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// in the vertex shader. Only when it is larger than some constant, march along the ray.\n\
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// Otherwise perform one intersection test which will be the common case.\n\
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\n\
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// Test if the ray intersects a sphere with the ellipsoid's maximum radius.\n\
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// For very oblate ellipsoids, using the ellipsoid's radii for an intersection test\n\
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// may cause false negatives. This will discard fragments before marching the ray forward.\n\
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float maxRadius = max(u_radii.x, max(u_radii.y, u_radii.z)) * 1.5;\n\
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vec3 direction = normalize(v_positionEC);\n\
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vec3 ellipsoidCenter = czm_modelView[3].xyz;\n\
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\n\
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float t1 = -1.0;\n\
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float t2 = -1.0;\n\
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\n\
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float b = -2.0 * dot(direction, ellipsoidCenter);\n\
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float c = dot(ellipsoidCenter, ellipsoidCenter) - maxRadius * maxRadius;\n\
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\n\
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float discriminant = b * b - 4.0 * c;\n\
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if (discriminant >= 0.0) {\n\
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t1 = (-b - sqrt(discriminant)) * 0.5;\n\
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t2 = (-b + sqrt(discriminant)) * 0.5;\n\
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}\n\
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\n\
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if (t1 < 0.0 && t2 < 0.0) {\n\
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discard;\n\
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}\n\
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\n\
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float t = min(t1, t2);\n\
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if (t < 0.0) {\n\
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t = 0.0;\n\
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}\n\
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\n\
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// March ray forward to intersection with larger sphere and find\n\
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czm_ray ray = czm_ray(t * direction, direction);\n\
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\n\
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vec3 ellipsoid_inverseRadii = vec3(1.0 / u_radii.x, 1.0 / u_radii.y, 1.0 / u_radii.z);\n\
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\n\
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czm_raySegment intersection = czm_rayEllipsoidIntersectionInterval(ray, ellipsoidCenter, ellipsoid_inverseRadii);\n\
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\n\
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if (czm_isEmpty(intersection))\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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// If the viewer is outside, compute outsideFaceColor, with normals facing outward.\n\
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vec4 outsideFaceColor = (intersection.start != 0.0) ? computeEllipsoidColor(ray, intersection.start, 1.0) : vec4(0.0);\n\
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\n\
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// If the viewer either is inside or can see inside, compute insideFaceColor, with normals facing inward.\n\
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vec4 insideFaceColor = (outsideFaceColor.a < 1.0) ? computeEllipsoidColor(ray, intersection.stop, -1.0) : vec4(0.0);\n\
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\n\
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gl_FragColor = mix(insideFaceColor, outsideFaceColor, outsideFaceColor.a);\n\
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gl_FragColor.a = 1.0 - (1.0 - insideFaceColor.a) * (1.0 - outsideFaceColor.a);\n\
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\n\
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#ifdef WRITE_DEPTH\n\
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#ifdef GL_EXT_frag_depth\n\
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t = (intersection.start != 0.0) ? intersection.start : intersection.stop;\n\
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vec3 positionEC = czm_pointAlongRay(ray, t);\n\
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vec4 positionCC = czm_projection * vec4(positionEC, 1.0);\n\
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#ifdef LOG_DEPTH\n\
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czm_writeLogDepth(1.0 + positionCC.w);\n\
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#else\n\
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float z = positionCC.z / positionCC.w;\n\
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\n\
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float n = czm_depthRange.near;\n\
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float f = czm_depthRange.far;\n\
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\n\
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gl_FragDepthEXT = (z * (f - n) + f + n) * 0.5;\n\
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#endif\n\
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#endif\n\
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#endif\n\
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}\n\
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";
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