62 lines
1.9 KiB
GLSL
62 lines
1.9 KiB
GLSL
/* Copyright (c) 2024, Sascha Willems
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 the "License";
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#version 460
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#extension GL_EXT_ray_tracing : enable
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#extension GL_EXT_nonuniform_qualifier : enable
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// This extension is required for fetching position data in the closest hit shader
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#extension GL_EXT_ray_tracing_position_fetch : require
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layout(location = 0) rayPayloadInEXT vec3 hitValue;
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hitAttributeEXT vec2 attribs;
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layout(binding = 2, set = 0) uniform UBO
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{
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mat4 viewInverse;
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mat4 projInverse;
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int displayMode;
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} ubo;
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void main()
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{
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// We need the barycentric coordinates to calculate data for the current position
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const vec3 barycentricCoords = vec3(1.0 - attribs.x - attribs.y, attribs.x, attribs.y);
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// With VK_KHR_ray_tracing_position_fetch we can access the vertices for the hit triangle in the shader
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vec3 pos0 = gl_HitTriangleVertexPositionsEXT[0];
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vec3 pos1 = gl_HitTriangleVertexPositionsEXT[1];
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vec3 pos2 = gl_HitTriangleVertexPositionsEXT[2];
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vec3 currentPos = pos0 * barycentricCoords.x + pos1 * barycentricCoords.y + pos2 * barycentricCoords.z;
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hitValue = vec3(0.0);
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switch (ubo.displayMode) {
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case(0): {
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// Visualize the geometric normal
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vec3 normal = normalize(cross(pos1 - pos0, pos2 - pos0));
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normal = normalize(vec3(normal * gl_WorldToObjectEXT));
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hitValue = normal;
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break;
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}
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case(1): {
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// Visualize the vertex position
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hitValue = currentPos;
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break;
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}
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}
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} |