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Add vk_ray_trace_indirect_scissor sample

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mklefrancois 2020-12-15 09:06:54 +01:00
parent 27d8a79ce3
commit a6690f149a
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24
docs/vkrt_tutorial.md.htm
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@ -1697,11 +1697,17 @@ the usage flag to include that stage. This was done in section Additions to the
## updateUniformBuffer
The computation of the matrix inverses is done in `updateUniformBuffer`, after setting the `ubo.proj` matrix:
The computation of the matrix inverses is done in `updateUniformBuffer`, after setting the `hostUBO.proj` matrix:
```` C
// #VKRay
ubo.projInverse = nvmath::invert(ubo.proj);
hostUBO.projInverse = nvmath::invert(hostUBO.proj);
````
We also have to indicate that the UBO will be used in the raytracing shaders.
```` C
auto uboUsageStages = vk::PipelineStageFlagBits::eVertexShader
| vk::PipelineStageFlagBits::eRayTracingShaderKHR;
````
## Ray generation (raytrace.rgen)
@ -2164,6 +2170,20 @@ At the end of the method, we destroy the shader module for the shadow miss shade
The spec does not guarantee a recursion check at runtime. If you exceed either
the recursion depth you reported in the raytrace pipeline create info, or the
physical device recursion limit, undefined behaviour results.
The KHR raytracing spec lowers the minimum guaranteed recursion limit from
31 (in the original NV spec) to the much more modest limit of 1 (i.e. no
recursion at all). Since we now need a recursion limit of 2, we should check
that the device supports the needed level of recursion:
```` C
// Spec only guarantees 1 level of "recursion". Check for that sad possibility here.
if (m_rtProperties.maxRayRecursionDepth <= 1) {
throw std::runtime_error("Device fails to support ray recursion (m_rtProperties.maxRayRecursionDepth <= 1)");
}
````
Recall that `m_rtProperties` was filled in in `HelloVulkan::initRayTracing`.
## `traceRaysKHR`