28 lines
1.0 KiB
GLSL
28 lines
1.0 KiB
GLSL
// See IntersectionUtils.glsl for the definitions of Ray, Intersections,
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// setIntersectionPair, INF_HIT, NO_HIT
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/* intersectDepth defines (set in Scene/VoxelRenderResources.js)
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#define DEPTH_INTERSECTION_INDEX ###
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*/
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void intersectDepth(in vec2 screenCoord, in Ray ray, inout Intersections ix) {
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float logDepthOrDepth = czm_unpackDepth(texture(czm_globeDepthTexture, screenCoord));
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float entry;
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float exit;
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if (logDepthOrDepth != 0.0) {
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// Calculate how far the ray must travel before it hits the depth buffer.
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vec4 eyeCoordinateDepth = czm_screenToEyeCoordinates(screenCoord, logDepthOrDepth);
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eyeCoordinateDepth /= eyeCoordinateDepth.w;
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entry = dot(eyeCoordinateDepth.xyz - ray.pos, ray.dir);
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exit = +INF_HIT;
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} else {
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// There's no depth at this location.
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entry = NO_HIT;
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exit = NO_HIT;
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}
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ix.distanceToDepthBuffer = entry;
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#if defined(DEPTH_TEST)
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setIntersectionPair(ix, DEPTH_INTERSECTION_INDEX, vec2(entry, exit));
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#endif
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}
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