spirv-cross2

Safe and sound Rust bindings to SPIRV-Cross.

All backends exposed by the SPIRV-Cross C API are fully supported, including

• GLSL
• HLSL
• MSL
• JSON
• C++
• Reflection Only

The API provided is roughly similar to the SPIRV-Cross Compiler C++ API, with some inspiration from naga. A best effort has been made to ensure that these bindings are sound, and that mutations occur strictly within Rust's borrow rules.

Usage

Here is an example of using the API to do some reflection and compile to GLSL.

use spirv_cross2::compile::{CompilableTarget, CompiledArtifact};
use spirv_cross2::{Module, SpirvCrossContext, SpirvCrossError};
use spirv_cross2::compile::glsl::GlslVersion;
use spirv_cross2::reflect::{DecorationValue, ResourceType};
use spirv_cross2::spirv;
use spirv_cross2::targets::Glsl;

fn compile_spirv(words: &[u32]) -> Result<CompiledArtifact<'static, Glsl>, SpirvCrossError> {
    let module = Module::from_words(words);
    let context = SpirvCrossContext::new()?;

    let mut compiler = context.into_compiler::<Glsl>(module)?;

    let resources = compiler.shader_resources()?;

    for resource in resources.resources_for_type(ResourceType::SampledImage)? {
        let Some(DecorationValue::Literal(set)) =
                compiler.decoration(resource.id,  spirv::Decoration::DescriptorSet)? else {
            continue;
        };
        let Some(DecorationValue::Literal(binding)) =
            compiler.decoration(resource.id,  spirv::Decoration::Binding)? else {
            continue;
        };

        println!("Image {} at set = {}, binding = {}", resource.name, set, binding);

        // Modify the decoration to prepare it for GLSL.
        compiler.set_decoration(resource.id, spirv::Decoration::DescriptorSet,
                DecorationValue::unset())?;

        // Some arbitrary remapping if we want.
        compiler.set_decoration(resource.id, spirv::Decoration::Binding,
            Some(set * 16 + binding))?;
    }

    let mut options = Glsl::options();
    options.version = GlslVersion::Glsl300Es;

    compiler.compile(&options)
}

Features

By default, the glsl, hlsl, and msl features are enabled by default. The cpp and json targets can be enabled in Cargo.toml

 [dependencies]

 spirv-cross2 = { features = ["cpp", "json"] }

SPIRV-Cross will only be built with support for enabled targets. If you want to only perform reflection and shrink the binary size, you can disable all but the None target.

 [dependencies]

 spirv-cross2 = { default-features = false }

To enable all features, including f16 and vector constant support, use the full feature.

 [dependencies]

 spirv-cross2 = { features = ["full"] }

f16 and vector specialization constants support

When querying specialization constants, spirv-cross2 includes optional support for f16 via half and Vec2, Vec3, Vec4, and Mat4 types via gfx-maths.

 [dependencies]

 spirv-cross2 = { features = ["f16", "half"] }

License

This project is licensed under either of Apache License, Version 2.0 or MIT license, at your option.

Contributing

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed under the terms of both the Apache License, Version 2.0 and the MIT license without any additional terms or conditions.