Examples

This directory contains several examples of rust-gpu use. There are shader examples in shaders, and runner programs that build and execute the shaders in a variety of ways in runners.

The shaders:

sky: draws a landscape with a small white sun, blue sky, and yellow ground. This is the default shader.
simplest: draws a red triangle on a green background.
mouse: a swirling animation that can be influenced by clicking and dragging the mouse cursor.
compute: a compute shader that prints a sequence of integers from the '3x+1' problem.

The runners:

WGPU: runs the shader code on the GPU using wgpu, a graphics crate based on WebGPU.
WGPU+wasm: like WGPU but runs in a web browser using wasm.
ash: runs the shader code on the GPU using ash, a Vulkan wrapper crate for Rust.
CPU: runs the shader code on the CPU, using rayon for parallelism.

Not all shaders work with all runners. The following combinations are supported.

WGPU runner:
- cargo run --release -p example-runner-wgpu runs the sky shader.
- cargo run --release -p example-runner-wgpu -- --shader=sky also runs the sky shader.
- cargo run --release -p example-runner-wgpu -- --shader=simplest runs the simplest shader.
- cargo run --release -p example-runner-wgpu -- --shader=mouse runs the mouse shader.
- cargo run --release -p example-runner-wgpu -- --shader=compute runs the compute shader.
WGPU+wasm runner in the browser (requires browser WebGPU support, most recently tested with Chromium 140 on Linux):
- rustup target add wasm32-unknown-unknown installs the necessary wasm support for Rust.
- cargo run-wasm -p example-runner-wgpu runs the local server hosting the mouse shader.
- chromium --enable-unsafe-webgpu http://localhost:8000 runs Chromium with WebGPU enabled and views the mouse shader. (The mouse shader is the default on WGPU+wasm.)
ash runner:
- cargo run --release -p example-runner-ash runs the sky shader. Use the up and down arrows to adjust the sun's intensity. Use F5 to recompile the shader code (but note that the image won't redraw afterwards unless the intensity is adjusted).
- cargo run --release -p example-runner-ash -- --shader=sky also runs the sky shader.
- cargo run --release -p example-runner-ash -- --shader=simplest runs the simplest shader.
- cargo run --release -p example-runner-ash -- --shader=mouse runs the mouse shader. The click-and-drag functionality is missing and the image only animates on mouse or keyboard input, but it still is a useful example. A pull request to fix these shortcomings would be welcome!
CPU runner:
- cargo run --release -p example-runner-cpu runs the sky shader.

Finally, the multibuilder folder is a very short example of how to use the multimodule feature of spirv-builder.