quicksilver 0.3.5

A simple game framework for 2D games in pure Rust
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use crate::{
    geom::{Transform, Vector},
    graphics::{Background, GpuTriangle, Vertex}
};

/// A way to store rendered objects without having to re-process them
pub struct Mesh {
    /// All the vertices in the mesh
    pub vertices: Vec<Vertex>,
    /// All the triangles in the mesh
    pub triangles: Vec<GpuTriangle>
}

impl Mesh {
    /// Create a new, empty mesh
    ///
    /// This allocates, so hold on to meshes rather than creating and destroying them
    pub fn new() -> Mesh {
        Mesh {
            vertices: Vec::new(),
            triangles: Vec::new()
        }
    }

    /// Clear the mesh, removing anything that has been drawn to it
    pub fn clear(&mut self) {
        self.vertices.clear();
        self.triangles.clear();
    }

    /// Add vertices from an iterator, some transforms, and a background
    pub fn add_positioned_vertices(&mut self, vertices: impl Iterator<Item = Vector>,
            trans: Transform, tex_trans: Option<Transform>, bkg: Background) -> u32 {
        let offset = self.vertices.len();
        self.vertices.extend(vertices
            .map(|v| Vertex::new(trans * v, tex_trans.map(|trans| trans * v), bkg)));
        offset as u32
    }

    /// Add all the data from the other mesh into this mesh
    pub fn extend(&mut self, other: &Mesh) {
        self.vertices.extend(other.vertices.iter().cloned());
        self.triangles.extend(other.triangles.iter().cloned());
    }
}