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doc: document d3d12 differences

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chyyran 2023-02-05 02:22:13 -05:00
parent 35f5b143c2
commit 66a4b1a648
2 changed files with 10 additions and 5 deletions
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11
README.md
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@ -102,14 +102,19 @@ Please report an issue if you run into a shader that works in RetroArch, but not
* All caveats from the OpenGL 3.3+ section should be considered.
* Should work on OpenGL 4.5 but this is not guaranteed. The OpenGL 4.6 runtime may eventually switch to using `ARB_spirv_extensions` for loading shaders, and this will not be marked as a breaking change.
* The OpenGL 4.6 runtime uses Direct State Access to minimize changes to the OpenGL state. For GPUs released within the last 5 years, this may improve performance.
* Direct3D 11
* Framebuffer copies are done via `ID3D11DeviceContext::CopySubresourceRegion` rather than a CPU conversion + copy.
* HDR10 support is not part of the shader runtime and is not supported.
* Vulkan 1.3+
* The Vulkan runtime uses [`VK_KHR_dynamic_rendering`](https://registry.khronos.org/vulkan/specs/1.3-extensions/man/html/VK_KHR_dynamic_rendering.html) by default.
This extension must be enabled at device creation. Explicit render passes can be used by configuring filter chain options, but may have reduced performance
compared to dynamic rendering.
* UBOs use multiple discontiguous buffers. This may be improved in the future by switching to VMA rather than manually handling allocations.
* Direct3D 11
* Framebuffer copies are done via `ID3D11DeviceContext::CopySubresourceRegion` rather than a CPU conversion + copy.
* HDR10 support is not part of the shader runtime and is not supported.
* Direct3D 12
* The Direct3D 12 runtime uses [render passes](https://learn.microsoft.com/en-us/windows/win32/direct3d12/direct3d-12-render-passes). This feature has been available since Windows 10 version 1809,
which was released in late 2018.
* For maximum compatibility with shaders, a shader compile pipeline based on [`spirv-to-dxil`](https://github.com/SnowflakePowered/spirv-to-dxil-rs) is used, with the SPIRV-Cross HLSL pipeline used as a fallback.
This brings shader compatibility beyond what the RetroArch Direct3D 12 runtime provides. The HLSL pipeline fallback may be removed in the future as`spirv-to-dxil` improves.
Most, if not all shader presets should work fine on librashader. The runtime specific differences should not affect the output,
and are more a heads-up for integrating librashader into your project.

2
librashader-runtime-d3d12/src/lib.rs
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@ -25,7 +25,7 @@ mod tests {
#[test]
fn triangle_d3d12() {
let sample = hello_triangle::d3d12_hello_triangle::Sample::new(
// "../test/slang-shaders/crt/crt-royale.slangp",
// "../test/slang-shaders/crt/crt-lottes.slangp",
"../test/slang-shaders/bezel/Mega_Bezel/Presets/MBZ__0__SMOOTH-ADV.slangp",
&SampleCommandLine {
use_warp_device: false,