rustial-renderer-wgpu 0.0.1

Pure WGPU renderer for the rustial 2.5D map engine
Documentation 
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// Shadow depth pass — renders geometry from the light's perspective.
//
// Only outputs depth (no colour attachment).  Used for both fill-extrusion
// and model shadow casters.  The per-cascade light VP matrix is provided
// via the uniform.

struct ShadowUniforms {
    light_view_proj: mat4x4<f32>,
};

@group(0) @binding(0)
var<uniform> shadow: ShadowUniforms;

// -- Fill-extrusion shadow caster ------------------------------------------

struct FillExtrusionVertexInput {
    @location(0) position: vec3<f32>,
    @location(1) normal:   vec3<f32>,
    @location(2) color:    vec4<f32>,
};

@vertex
fn vs_fill_extrusion(in: FillExtrusionVertexInput) -> @builtin(position) vec4<f32> {
    return shadow.light_view_proj * vec4<f32>(in.position, 1.0);
}

// -- Model shadow caster ---------------------------------------------------

struct ModelVertexInput {
    @location(0) position: vec3<f32>,
    @location(1) normal:   vec3<f32>,
    @location(2) uv:       vec2<f32>,
};

@group(1) @binding(0)
var<uniform> model_transform: mat4x4<f32>;

@vertex
fn vs_model(in: ModelVertexInput) -> @builtin(position) vec4<f32> {
    let world_pos = model_transform * vec4<f32>(in.position, 1.0);
    return shadow.light_view_proj * world_pos;
}

// No fragment shader needed — depth-only pass.