radiance 0.7.1

Video art software designed for live performance
Documentation 
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struct Uniforms {
    opacity: f32,
}

@group(0) @binding(0)
var<uniform> global: Uniforms;

@group(1) @binding(0)
var iTexture: texture_2d<f32>;

@group(1) @binding(1)
var iSampler: sampler;

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

@vertex
fn vs_main(@builtin(vertex_index) vertex_index: u32) -> VertexOutput {
    var pos_array = array<vec2<f32>, 4>(
        vec2<f32>(1., 1.),
        vec2<f32>(-1., 1.),
        vec2<f32>(1., -1.),
        vec2<f32>(-1., -1.),
    );
    var uv_array = array<vec2<f32>, 4>(
        vec2<f32>(1., 0.),
        vec2<f32>(0., 0.),
        vec2<f32>(1., 1.),
        vec2<f32>(0., 1.),
    );

    return VertexOutput(
        vec4<f32>(pos_array[vertex_index], 0., 1.),
        uv_array[vertex_index],
    );
}

@fragment
fn fs_main(vertex: VertexOutput) -> @location(0) vec4<f32> {
    return textureSample(iTexture, iSampler, vertex.uv) * global.opacity;
}