iced_frame 0.1.0

Iced widget that renders an offscreen RGBA frame buffer as a wgpu texture
Documentation 
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@group(0) @binding(0) var tex: texture_2d<f32>;
@group(0) @binding(1) var samp: sampler;
@group(0) @binding(2) var<uniform> uv_transform: vec4<f32>;

struct VertexOutput {
    @builtin(position) position: vec4<f32>,
    @location(0) uv: vec2<f32>,
}

@vertex
fn vs_main(@builtin(vertex_index) idx: u32) -> VertexOutput {
    var positions = array<vec2<f32>, 6>(
        vec2<f32>(-1.0, -1.0),
        vec2<f32>( 1.0, -1.0),
        vec2<f32>(-1.0,  1.0),
        vec2<f32>( 1.0, -1.0),
        vec2<f32>( 1.0,  1.0),
        vec2<f32>(-1.0,  1.0),
    );
    // +Y up in NDC, +V down in texture — flip V.
    var base_uvs = array<vec2<f32>, 6>(
        vec2<f32>(0.0, 1.0),
        vec2<f32>(1.0, 1.0),
        vec2<f32>(0.0, 0.0),
        vec2<f32>(1.0, 1.0),
        vec2<f32>(1.0, 0.0),
        vec2<f32>(0.0, 0.0),
    );

    var out: VertexOutput;
    out.position = vec4<f32>(positions[idx], 0.0, 1.0);
    out.uv = base_uvs[idx] * uv_transform.xy + uv_transform.zw;
    return out;
}

@fragment
fn fs_main(in: VertexOutput) -> @location(0) vec4<f32> {
    if any(in.uv < vec2<f32>(0.0, 0.0)) || any(in.uv > vec2<f32>(1.0, 1.0)) {
        discard;
    }
    return textureSample(tex, samp, in.uv);
}