# Shader Package Contract

Each shader package lives under `shaders/<id>/` and includes:

- `shader.json`
- `shader.slang`

## Manifest fields

`shader.json` defines:

- `id`
- `name`
- `description`
- `category`
- `entryPoint`
- `parameters`

Supported parameter types:

- `float`
- `vec2`
- `color`
- `bool`
- `enum`

## Slang contract

The runtime owns the fragment entry point, the UYVY-to-RGBA decode pass, and final mix/bypass behavior.

Your `shader.slang` file implements:

```slang
float4 shadeVideo(ShaderContext context)
{
    return context.sourceColor;
}
```

Available built-ins through `ShaderContext`:

- `uv`
- `sourceColor` - the already-decoded full-resolution RGBA video color at `uv`
- `inputResolution`
- `outputResolution`
- `time`
- `frameCount`
- `mixAmount`
- `bypass`

Manifest parameters are exposed to the shader as globals named by their `id`.

Helper function:

- `sampleVideo(float2 uv)` returns decoded full-resolution RGBA video from the live DeckLink input.