48 lines
1.7 KiB
Plaintext
48 lines
1.7 KiB
Plaintext
// Given an anchored position and sprite dimensions,
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// return the translation that should be applied on
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// vertex coordinates
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fn anchor(
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anchor: u32, // Anchor index
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position: vec2<f32>, // Anchored position
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dim: vec2<f32>, // Sprite dimensions (width, height)
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) -> vec2<f32> {
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var trans: vec2<f32> = vec2(0.0, 0.0);
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let window_dim = global_data.window_size / global_data.window_scale.x;
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if anchor == 0u { // NW C (screen anchor, sprite anchor)
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trans += vec2(-window_dim.x, window_dim.y) / 2.0; // origin
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trans += vec2(0.0, 0.0) / 2.0; // offset
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} else if anchor == 1u { // NW NW
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trans += vec2(-window_dim.x, window_dim.y) / 2.0;
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trans += vec2(dim.x, -dim.y) / 2.0;
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} else if anchor == 2u { // NW NE
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trans += vec2(-window_dim.x, window_dim.y) / 2.0;
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trans += vec2(-dim.x, -dim.y) / 2.0;
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} else if anchor == 3u { // NW SW
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trans += vec2(-window_dim.x, window_dim.y) / 2.0;
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trans += vec2(dim.x, dim.y) / 2.0;
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} else if anchor == 4u { // NW SE
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trans += vec2(-window_dim.x, window_dim.y) / 2.0;
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trans += vec2(-dim.x, dim.y) / 2.0;
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} else if anchor == 5u { // NE NE
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trans += vec2(window_dim.x, window_dim.y) / 2.0;
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trans += vec2(-dim.x, -dim.y) / 2.0;
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} else if anchor == 6u { // C C
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trans += vec2(0.0, 0.0) / 2.0;
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trans += vec2(0.0, 0.0) / 2.0;
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} else if anchor == 7u { // C NW
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trans += vec2(0.0, 0.0) / 2.0;
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trans += vec2(dim.x, -dim.y) / 2.0;
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} else { // center / center as default, since it's the most visible variant.
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trans += vec2(0.0, 0.0) / 2.0;
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trans += vec2(0.0, 0.0) / 2.0;
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}
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trans += position;
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// This renders correctly, but the offsets here are off by a factor of two.
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// I'm not sure why... might be because WGPU screen coordinates are -1 to 1.
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return (trans / window_dim) * 2.0;
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}
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