74 lines
2.3 KiB
HLSL
74 lines
2.3 KiB
HLSL
/* 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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struct Attributes
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{
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float2 bary;
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};
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struct Payload
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{
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[[vk::location(0)]] float3 hitValue;
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};
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struct UBO
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{
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float4x4 viewInverse;
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float4x4 projInverse;
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int displayMode;
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};
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ConstantBuffer<UBO> ubo : register(b2);
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// We need to use special syntax for SPIR-V inlines
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#define HitTriangleVertexPositionsKHR 5335
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#define RayTracingPositionFetchKHR 5336
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const static float3 gl_HitTriangleVertexPositions[3];
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[[vk::ext_extension("SPV_KHR_ray_tracing_position_fetch")]]
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[[vk::ext_capability(RayTracingPositionFetchKHR)]]
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[shader("closesthit")]
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void main(inout Payload p, in Attributes attribs)
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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 float3 barycentricCoords = float3(1.0f - attribs.bary.x - attribs.bary.y, attribs.bary.x, attribs.bary.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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float3 pos0 = gl_HitTriangleVertexPositions[0];
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float3 pos1 = gl_HitTriangleVertexPositions[1];
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float3 pos2 = gl_HitTriangleVertexPositions[2];
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float3 currentPos = pos0 * barycentricCoords.x + pos1 * barycentricCoords.y + pos2 * barycentricCoords.z;
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p.hitValue = float3(0.0, 0.0, 0.0);
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switch (ubo.displayMode)
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{
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case (0):{
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// Visualize the geometric normal
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float3 normal = normalize(cross(pos1 - pos0, pos2 - pos0));
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normal = normalize(mul(float4(normal, 1.0), WorldToObject4x3()));
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p.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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p.hitValue = currentPos;
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break;
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}
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}
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} |