82 lines
2.2 KiB
Rust
82 lines
2.2 KiB
Rust
//! Draw triangles!
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use crate::color;
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use crate::core::{Rectangle, Size};
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use crate::gradient;
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use crate::Damage;
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use bytemuck::{Pod, Zeroable};
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/// A low-level primitive to render a mesh of triangles.
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#[derive(Debug, Clone, PartialEq)]
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pub enum Mesh {
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/// A mesh with a solid color.
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Solid {
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/// The vertices and indices of the mesh.
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buffers: Indexed<SolidVertex2D>,
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/// The size of the drawable region of the mesh.
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///
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/// Any geometry that falls out of this region will be clipped.
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size: Size,
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},
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/// A mesh with a gradient.
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Gradient {
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/// The vertices and indices of the mesh.
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buffers: Indexed<GradientVertex2D>,
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/// The size of the drawable region of the mesh.
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///
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/// Any geometry that falls out of this region will be clipped.
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size: Size,
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},
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}
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impl Damage for Mesh {
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fn bounds(&self) -> Rectangle {
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match self {
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Self::Solid { size, .. } | Self::Gradient { size, .. } => {
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Rectangle::with_size(*size)
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}
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}
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}
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}
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/// A set of vertices and indices representing a list of triangles.
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#[derive(Clone, Debug, PartialEq, Eq)]
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pub struct Indexed<T> {
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/// The vertices of the mesh
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pub vertices: Vec<T>,
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/// The list of vertex indices that defines the triangles of the mesh.
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///
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/// Therefore, this list should always have a length that is a multiple of 3.
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pub indices: Vec<u32>,
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}
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/// A two-dimensional vertex with a color.
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#[derive(Copy, Clone, Debug, PartialEq, Zeroable, Pod)]
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#[repr(C)]
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pub struct SolidVertex2D {
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/// The vertex position in 2D space.
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pub position: [f32; 2],
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/// The color of the vertex in __linear__ RGBA.
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pub color: color::Packed,
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}
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/// A vertex which contains 2D position & packed gradient data.
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#[derive(Copy, Clone, Debug, PartialEq, Zeroable, Pod)]
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#[repr(C)]
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pub struct GradientVertex2D {
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/// The vertex position in 2D space.
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pub position: [f32; 2],
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/// The packed vertex data of the gradient.
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pub gradient: gradient::Packed,
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}
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/// A renderer capable of drawing a [`Mesh`].
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pub trait Renderer {
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/// Draws the given [`Mesh`].
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fn draw_mesh(&mut self, mesh: Mesh);
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}
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