doc: update readme
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README.md
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README.md
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# librashader
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# librashader
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![image](https://user-images.githubusercontent.com/1000503/202991618-e3e38e05-f0de-429d-a3ee-4cd0b077f88f.png)
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![crt-royale](https://user-images.githubusercontent.com/1000503/202991618-e3e38e05-f0de-429d-a3ee-4cd0b077f88f.png)
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<small>*crt-royale-fake-bloom*</small>
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<small>*crt-royale-fake-bloom*</small>
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A preprocessor, compiler, and runtime for RetroArch 'slang' shaders, rewritten in pure Rust.
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librashader (*/ˈli:brəʃeɪdɚ/*) is a preprocessor, compiler, and runtime for RetroArch 'slang' shaders, rewritten in pure Rust.
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Heavily WIP.
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Heavily WIP.
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@ -12,15 +12,15 @@ Heavily WIP.
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librashader supports OpenGL 3, Vulkan, DirectX 11, and DirectX 12. Support is WIP for all runtimes except OpenGL 3. Older versions
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librashader supports OpenGL 3, Vulkan, DirectX 11, and DirectX 12. Support is WIP for all runtimes except OpenGL 3. Older versions
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of DirectX and OpenGL, as well as Metal, are not supported (but pull-requests are welcome).
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of DirectX and OpenGL, as well as Metal, are not supported (but pull-requests are welcome).
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| **API** | **Status** | **`librashader` feature** |
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| **API** | **Status** | **`librashader` feature** |
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|------------|------------|--------------------------|
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|-------------|------------|---------------------------|
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| OpenGL 3+ | ✔ | `gl` |
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| OpenGL 3.3+ | ✔ | `gl` |
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| Vulkan | 🚧 | `vk` |
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| Vulkan | 🚧 | `vk` |
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| Direct3D11 | 🚧 | `d3d11` |
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| Direct3D11 | 🚧 | `d3d11` |
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| Direct3D12 | 🚧 | `d3d12` |
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| Direct3D12 | 🚧 | `d3d12` |
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| OpenGL 2 | ❌ | |
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| OpenGL 2 | ❌ | |
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| DirectX 9 | ❌ | |
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| DirectX 9 | ❌ | |
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| Metal | ❌ | |
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| Metal | ❌ | |
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## Usage
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## Usage
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@ -31,6 +31,31 @@ librashader provides both a Rust API under the `librashader` crate, and a C API.
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The librashader C API is best used by linking statically with `librashader_ld`, which implements a loader that dynamically
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The librashader C API is best used by linking statically with `librashader_ld`, which implements a loader that dynamically
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loads the librashader (`librashader.so` or `rashader.dll`) implementation in the search path.
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loads the librashader (`librashader.so` or `rashader.dll`) implementation in the search path.
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## Compatibility
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librashader implements the entire RetroArch shader pipeline and is highly compatible with existing shaders,
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but there are some deliberate differences in design choices that may potentially cause incompatiblities with certain
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shaders.
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Please report an issue if you run into a shader that works in RetroArch, but not under librashader.
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* Variables can only be bound in *either* the UBO or push constant block.
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* RetroArch allows a variable to be present in both a push constant block and a UBO block at the same time. To make the
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implementation a little cleaner, librashader only allows a variable to be in *either* a push constant block or a UBO
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block. As far as I have tested, there are no shaders in [libretro/slang-shaders](https://github.com/libretro/slang-shaders)
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that bind the same variable in both the push constant and the UBO block.
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* Filter chains do not terminate at the backbuffer.
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* Unlike RetroArch, librashader does not have full knowledge of the entire rendering state and is designed to be pluggable
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at any point in your render pipeline. Instead, filter chains terminate at a caller-provided output surface and viewport.
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It is the caller's responsibility to blit the surface back to the backbuffer.
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* Runtime-specific differences
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* OpenGL
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* Copying of in-flight framebuffer contents is done via `glBlitFramebuffer` rather than drawing a quad into an intermediate FBO.
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* Sampler objects are used rather than `glTexParameter`.
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* Sampler inputs and outputs are not renamed. This is useful for debugging shaders in RenderDoc.
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* Direct3D 11
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* The staging buffer is not kept around when loading static textures (LUTs).
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## License
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## License
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The core parts of librashader such as the preprocessor, the preset parser,
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The core parts of librashader such as the preprocessor, the preset parser,
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the reflection library, and the runtimes, are all licensed under the Mozilla Public License version 2.0.
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the reflection library, and the runtimes, are all licensed under the Mozilla Public License version 2.0.
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