Crate spirv_builder
source ·Expand description
§spirv-builder
This crate gives you SpirvBuilder
, a tool to build shaders using rust-gpu.
It takes care of pulling in the SPIR-V
backend for Rust, rustc_codegen_spirv
, and invoking a nested build using appropriate compiler options, some of which may be set using the SpirvBuilder
API.
§Example
use spirv_builder::{MetadataPrintout, SpirvBuilder};
fn main() -> Result<(), Box<dyn std::error::Error>> {
SpirvBuilder::new("my_shaders", "spirv-unknown-vulkan1.1")
.print_metadata(MetadataPrintout::Full)
.build()?;
Ok(())
}
This example will build a shader crate called my_shaders
. You typically insert this code in your crate’s build.rs
that requires the shader binary. The path to the shader module’s binary will be set in the my_shaders.spv
environment variable, which you can include in your project using something along the lines of:
const SHADER: &[u8] = include_bytes!(env!("my_shaders.spv"));
§Building with spirv-builder
As spirv-builder
relies on rustc_codegen_spirv
being built for it (by Cargo, as a direct dependency), and due to the special nature of the latter (as a rustc
codegen backend “plugin”), both end up sharing the requirement for a very specific nightly toolchain version of Rust.
The current Rust toolchain version is: nightly-2024-04-24
.
Rust toolchain version history across rust-gpu releases (since 0.4
):
spirv-builder version | Rust toolchain version |
---|---|
0.10 | nightly-2024-04-24 |
0.9 | nightly-2023-05-27 |
0.8 | nightly-2023-04-15 |
0.7 | nightly-2023-03-04 |
0.6 | nightly-2023-01-21 |
0.5 | nightly-2022-12-18 |
0.4 | nightly-2022-10-29 |
As patch versions must be semver-compatible, they will always require the
same toolchain (for example, 0.6.0
and 0.6.1
both use nightly-2023-01-21
).
Only that exact Rust nightly toolchain version is supported. Since 0.4
, the commit hash of your current Rust toolchain is checked and you’ll get a build error when building rustc_codegen_spirv
with the wrong toolchain.
Notably, the error will also show what the rust-toolchain.toml
file should contain (to get the expected toolchain), which you can rely on when updating to a new release.
If you want to experiment with different, unsupported, Rust toolchain versions, this check can be omitted by defining the environment variable RUSTGPU_SKIP_TOOLCHAIN_CHECK
. Keep in mind that, as rustc_codegen_spirv
is heavily dependent on rustc
’s internal APIs, diverging too much from the supported toolchain version will quickly result in compile errors (or worse, e.g. spurious errors and/or incorrect behavior, when compiling shaders with it).
Structs§
Enums§
- SPIR-V operand kind: Capability
- Strategy used to handle Rust
panic!
s in shaders compiled to SPIR-V.