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30 lines
859 B
Rust
30 lines
859 B
Rust
use glam::{Vec2, Vec4};
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use spirv_std::spirv;
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/// WebGPU NDC is like OpenGL: (-1..1, -1..1, 0..1)
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/// https://www.w3.org/TR/webgpu/#coordinate-systems
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///
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/// So to make a fullscreen triangle around a box at (-1..1):
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///
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/// ```text
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/// 3 +
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/// |\
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/// 2 | \
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/// | \
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/// 1 +-----+
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/// | |\
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/// 0 | 0 | \
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/// | | \
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/// -1 +-----+-----+
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/// -1 0 1 2 3
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/// ```
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const FULLSCREEN_VERTICES: [Vec2; 3] = [Vec2::new(-1., -1.), Vec2::new(-1., 3.), Vec2::new(3., -1.)];
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#[spirv(vertex)]
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pub fn fullscreen_vertex(#[spirv(vertex_index)] vertex_index: u32, #[spirv(position)] gl_position: &mut Vec4) {
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// broken on edition 2024 branch
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// let vertex = unsafe { *FULLSCREEN_VERTICES.index_unchecked(vertex_index as usize) };
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let vertex = FULLSCREEN_VERTICES[vertex_index as usize];
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*gl_position = Vec4::from((vertex, 0., 1.));
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}
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