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https://github.com/KhronosGroup/SPIRV-Reflect

SPIRV-Reflect is a lightweight library that provides a C/C++ reflection API for SPIR-V shader bytecode in Vulkan applications.
https://github.com/KhronosGroup/SPIRV-Reflect

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SPIRV-Reflect is a lightweight library that provides a C/C++ reflection API for SPIR-V shader bytecode in Vulkan applications.

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# SPIRV-Reflect



SPIRV-Reflect is a lightweight library that provides a C/C++ reflection API for

[SPIR-V](https://www.khronos.org/spir/) shader bytecode in

[Vulkan](https://www.khronos.org/vulkan/) applications.



SPIRV-Reflect has been tested on Linux and Windows.



## NEWS



- **2023-07-04** -  We have removed support for

  [Bazel](https://bazel.build).

- **2023-06-07** -  We are planning to remove support for

  [Bazel](https://bazel.build/).  If you rely on Bazel for

  building this code, please let us know in

  https://github.com/KhronosGroup/SPIRV-Reflect/issues/188.

- **2023-05-03** -  The `master` branch has been renamed to `main` (see

  https://github.com/KhronosGroup/SPIRV-Reflect/issues/164 for

  details).  Please update your fork as per instructions in that

  issue.



## Features



- Extract descriptor bindings from SPIR-V bytecode, to assist in the generation of

  Vulkan descriptor set and pipeline layouts.

- Extract push constant block size from SPIR-V bytecode to assist in the generation

  of pipeline layouts.

- Extract full layout data for uniform buffer and push constant blocks from SPIR-V

  bytecode, to assist in application updates of these structures.

- Extract input/output variables from SPIR-V bytecode (including semantic decorations

  for HLSL shaders), to assist in validation of pipeline input/output settings.

- Remap descriptor bindings at runtime, and update the source SPIR-V bytecode

  accordingly.

- Log all reflection data as human-readable text.



## Integration



SPIRV-Reflect is designed to make integration as easy as possible. The only

external dependency is the [Vulkan SDK](https://vulkan.lunarg.com/sdk/home).



To integrate SPIRV-Reflect into a project, simply add `spirv_reflect.h` and

`spirv_reflect.c` in the project's build, and include `spirv_reflect.h` from

the necessary source files.



If the project wants to use it's own SPIRV-Header path, it can set `SPIRV_REFLECT_USE_SYSTEM_SPIRV_H`



```cmake

# CMake example

target_compile_definitions(project_name PUBLIC SPIRV_REFLECT_USE_SYSTEM_SPIRV_H)

```



## Building Samples



**This step is only necessary when building/running SPIRV-Reflect's example applications.**



SPIRV-Reflect includes a collection of sample programs in the `examples/` directory which

demonstrate various use cases:



- **descriptors**: This sample demonstrates the retrieval of descriptor bindings, including

  the population of `VkDescriptorSetLayoutCreateInfo` structures from reflection data.

- **hlsl_resource_types**: This sample shows how various HLSL resource types are represented

  in SPIR-V.

- **io_variables**: This sample demonstrates the retrieval of input/output variables, including

  the population of `VkPipelineVertexInputStateCreateInfo` structures from reflection data.



To build the included sample applications, use [CMake](https://cmake.org/) to generate the

appropriate project files for your platform, then build them as usual.



Note that you can set VulkanSDK directory as your preference. For example, on Linux:

```

VULKAN_SDK=$HOME/VulkanSDK/1.1.70.1/x86_64 cmake -G Ninja  ..

```



## Usage



SPIRV-Reflect's core C API should be familiar to Vulkan developers:



```c++

#include "spirv_reflect.h"



int SpirvReflectExample(const void* spirv_code, size_t spirv_nbytes)

{

  // Generate reflection data for a shader

  SpvReflectShaderModule module;

  SpvReflectResult result = spvReflectCreateShaderModule(spirv_nbytes, spirv_code, &module);

  assert(result == SPV_REFLECT_RESULT_SUCCESS);



  // Enumerate and extract shader's input variables

  uint32_t var_count = 0;

  result = spvReflectEnumerateInputVariables(&module, &var_count, NULL);

  assert(result == SPV_REFLECT_RESULT_SUCCESS);

  SpvReflectInterfaceVariable** input_vars =

    (SpvReflectInterfaceVariable**)malloc(var_count * sizeof(SpvReflectInterfaceVariable*));

  result = spvReflectEnumerateInputVariables(&module, &var_count, input_vars);

  assert(result == SPV_REFLECT_RESULT_SUCCESS);



  // Output variables, descriptor bindings, descriptor sets, and push constants

  // can be enumerated and extracted using a similar mechanism.



  // Destroy the reflection data when no longer required.

  spvReflectDestroyShaderModule(&module);

}

```



A C++ wrapper is also provided.



## Building Examples



By adding `-DSPIRV_REFLECT_EXAMPLES=ON` in CMake you can see the use of the API used in action.



The `main_explorer.cpp` file is designed to allow an user to use their debugger of choice to breakpoint

and explorer the contents of the `SpvReflectShaderModule` object. Just build with `-DCMAKE_BUILD_TYPE=Debug`

and setup a debugger to run `./bin/explorer path/to/shader.spv`



## Building Self-Test Suite



SPIRV-Reflect uses [googletest](https://github.com/google/googletest) for self-testing.

This component is optional, and generally only of interest to developers modifying SPIRV-Reflect.

To run the self-tests:



- `git submodule init`

- `git submodule update`

- Enable `SPIRV_REFLECT_BUILD_TESTS` in CMake

- Build and run the `test-spirv-reflect` project.



## License



Copyright 2017-2018 Google Inc.



Licensed under the Apache License, Version 2.0 (the "License");

you may not use this file except in compliance with the License.

You may obtain a copy of the License at



[http://www.apache.org/licenses/LICENSE-2.0](http://www.apache.org/licenses/LICENSE-2.0)



Unless required by applicable law or agreed to in writing, software

distributed under the License is distributed on an "AS IS" BASIS,

WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

See the License for the specific language governing permissions and

limitations under the License.