paddle 0.1.0-beta.1

2D Game Engine for Rust on the Web
Documentation 
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use super::{GpuTriangle, GpuVertex};
use crate::Z_MAX;

/// Buffer for GPU primitives ready to be drawn, after tesselation and all CPU-side transformations have finished
pub struct GpuMesh {
    pub vertices: Vec<GpuVertex>,
    pub triangles: Vec<GpuTriangle>,
}

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

    /// Sets the z value for all vertices in the Mesh
    pub fn set_z(&mut self, z: i16) {
        for v in &mut self.vertices {
            v.z = z as f32 / Z_MAX as f32;
        }
        for t in &mut self.triangles {
            t.z = z as f32 / Z_MAX as f32;
        }
    }

    /// Scales all vertices in the mesh by the given factor, taking (0,0) as origin
    pub fn scale(&mut self, r: f32) {
        for p in self.vertices.iter_mut() {
            p.pos *= r;
        }
    }
}