pax-gpu 0.39.1

WGPU rendering library for the pax framework
Documentation 
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struct Globals {
    resolution: vec2<f32>,
    dpr: vec2<f32>,
    origin: vec2<f32>,
    padding: vec2<f32>,
};


@group(0) @binding(0) var<uniform> globals: Globals;
@group(0) @binding(1) var texture: texture_2d<f32>;
@group(0)@binding(2) var texture_sampler: sampler;
@group(1) @binding(0) var alpha_mask: texture_2d<f32>;
@group(1) @binding(1) var alpha_sampler: sampler;
@group(1) @binding(2) var<uniform> alpha_domain: vec4<f32>;

struct TextureVertex {
    @location(0) position: vec2<f32>,
    @location(1) texture_coord: vec2<f32>,
    @location(2) opacity: f32,
};

struct VertexOutput {
    @builtin(position) clip_position: vec4<f32>,
    @location(0) texture_coord: vec2<f32>,
    @location(1) opacity: f32,
};

@vertex
fn vs_main(
    model: TextureVertex,
) -> VertexOutput {
	var out: VertexOutput;
    var pos = model.position;
    pos = (pos - globals.origin) / globals.resolution;
    pos *= 2.0;
    pos -= 1.0;
    pos.y *= -1.0;
    out.clip_position = vec4<f32>(pos, 0.0, 1.0);
    out.texture_coord = model.texture_coord;
    out.opacity = model.opacity;
    return out;
}
// Fragment shader
@fragment
fn fs_main(in: VertexOutput) -> @location(0) vec4<f32> {
    let t = textureSample(texture, texture_sampler, in.texture_coord);
    let alpha = textureSampleLevel(alpha_mask, alpha_sampler,
        (in.clip_position.xy / globals.dpr + globals.origin - alpha_domain.xy) / alpha_domain.zw, 0.0).r;
    return vec4<f32>(t.x + in.texture_coord.x/1000.0, t.y + in.texture_coord.y/1000.0, t.z, t.w * alpha * in.opacity);
}