# truck-platform

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Graphic utility library based on wgpu.

## Sample Codes

### wgsl-sandbox

A sample of creating a render object by implementing "Rendered" in a new structure.

One can use xyr WGSL shader in the following way:

- Enter the shader path as an argument when executing the program.
- Drag and drop the shader into the window.

The rule of shaders:

- One can draw a image by implementing the function:

```wgsl
vec4<f32> main_image(coord: vec2<f32>, env: Environment);
```

- The parameter `coord` is the fragment coordinate. The origin is the lower left.
- The parameter `env` has the environment information. The declaration of struct is the following:

```wgsl
struct Environment {
    resolution: vec2<f32>;  // the resolution of the image
    mouse: vec4<f32>;       // the mouse information behaving the same as `iMouse` in Shadertoy.
    time: f32;              // the number of seconds since the application started.
};
```

Also, see the sample `newton-cuberoot.wgsl`, default shader, in `examples`.