39 lines
850 B
Text
39 lines
850 B
Text
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/* Copyright (c) 2023, Sascha Willems
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*
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* SPDX-License-Identifier: MIT
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*
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*/
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#version 460
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#extension GL_EXT_ray_tracing : require
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struct Sphere {
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vec3 center;
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float radius;
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vec4 color;
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};
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layout(binding = 3, set = 0) buffer Spheres { Sphere s[]; } spheres;
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// Ray-sphere intersection
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// By Inigo Quilez, from https://iquilezles.org/articles/spherefunctions/
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float sphIntersect(const Sphere s, vec3 ro, vec3 rd)
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{
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vec3 oc = ro - s.center;
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float b = dot(oc, rd);
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float c = dot(oc, oc) - s.radius * s.radius;
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float h = b * b - c;
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if (h < 0.0) {
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return -1.0;
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}
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h = sqrt(h);
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return -b - h;
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}
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void main() {
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Sphere sphere = spheres.s[gl_PrimitiveID];
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float hit = sphIntersect(sphere, gl_WorldRayOriginEXT, gl_WorldRayDirectionEXT);
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if (hit > 0) {
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reportIntersectionEXT(hit, 0);
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}
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}
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