vtsampler 0.1.1

Cross-platform GPU video format conversion and scaling (wgpu compute)
Documentation 
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{% if input_kind == "rgba" or input_kind == "bgra" %}
{% if need_scale %}
let input_size = textureDimensions(input_0);
{% if scale_filter == "bilinear" %}
let src = vec2<f32>(coords) * (vec2<f32>(input_size) / vec2<f32>(max_position));
let rgba = sample_bilinear(input_0, src, input_size);
{% else %}
let ic = map_coords(coords, input_size, max_position);
let rgba = textureLoad(input_0, ic, 0);
{% endif %}
let r = rgba.r;
let g = rgba.g;
let b = rgba.b;
{% else %}
let r = textureLoad(input_0, coords, 0).r;
let g = textureLoad(input_0, coords, 0).g;
let b = textureLoad(input_0, coords, 0).b;
{% endif %}
{% elif input_kind == "nv12" %}
{% if need_scale %}
let input_size = textureDimensions(input_0);
let ic = map_coords(coords, input_size, max_position);
let y = textureLoad(input_0, ic, 0).r;
let uv = textureLoad(input_1, ic / 2, 0).rg;
{% else %}
let y = textureLoad(input_0, coords, 0).r;
let uv = textureLoad(input_1, coords / 2, 0).rg;
{% endif %}
let u = uv.r - 0.5;
let v = uv.g - 0.5;
{% elif input_kind == "yuv420p" %}
{% if need_scale %}
let input_size = textureDimensions(input_0);
let ic = map_coords(coords, input_size, max_position);
let y = textureLoad(input_0, ic, 0).r;
let u = textureLoad(input_1, ic / 2, 0).r - 0.5;
let v = textureLoad(input_2, ic / 2, 0).r - 0.5;
{% else %}
let y = textureLoad(input_0, coords, 0).r;
let u = textureLoad(input_1, coords / 2, 0).r - 0.5;
let v = textureLoad(input_2, coords / 2, 0).r - 0.5;
{% endif %}
{% endif %}