rein 0.1.1

rein 3D Rendering Library
Documentation 
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// Normal visualization shader for debugging

struct CameraUniform {
    view_proj: mat4x4<f32>,
    eye: vec4<f32>,
};

struct ModelUniform {
    model: mat4x4<f32>,
    normal_matrix: mat4x4<f32>,
};

@group(0) @binding(0)
var<uniform> camera: CameraUniform;

@group(1) @binding(0)
var<uniform> model: ModelUniform;

struct VertexInput {
    @location(0) position: vec3<f32>,
    @location(1) normal: vec3<f32>,
    @location(2) color: vec3<f32>,
};

struct VertexOutput {
    @builtin(position) clip_position: vec4<f32>,
    @location(0) world_normal: vec3<f32>,
};

@vertex
fn vs_main(input: VertexInput) -> VertexOutput {
    var output: VertexOutput;

    let world_pos = model.model * vec4<f32>(input.position, 1.0);
    output.clip_position = camera.view_proj * world_pos;
    output.world_normal = normalize((model.normal_matrix * vec4<f32>(input.normal, 0.0)).xyz);

    return output;
}

@fragment
fn fs_main(input: VertexOutput) -> @location(0) vec4<f32> {
    // Remap normal from [-1, 1] to [0, 1] for visualization
    let n = normalize(input.world_normal);
    let color = n * 0.5 + 0.5;

    return vec4<f32>(color, 1.0);
}