bounding_box.rs

   1 use cube::Cube;
   2 use glium;
   3 use glium::{Display, Program, Surface};
   4 use glium::index::{IndexBuffer, PrimitiveType};
   5
   6 pub fn solid_fill_program(display: &Display) -> Program {
   7     let vertex_shader_src = include_str!("shaders/solid.vert");
   8     let fragment_shader_src = include_str!("shaders/solid.frag");
   9     Program::from_source(display, vertex_shader_src, fragment_shader_src, None).unwrap()
  10 }
  11
  12 #[derive(Copy, Clone)]
  13 struct Vertex { position: [f32; 3] }
  14 implement_vertex!(Vertex, position);
  15
  16 pub struct BoundingBox<'a> {
  17     vertexes: glium::VertexBuffer<Vertex>,
  18     program: &'a Program,
  19     indices: IndexBuffer<u16>,
  20 }
  21
  22 impl<'a> BoundingBox<'a> {
  23     pub fn new(display: &Display, c: &Cube, program: &'a Program) -> BoundingBox<'a> {
  24         let vertex_data = [
  25             Vertex { position: [c.xmin, c.ymin, c.zmin] },
  26             Vertex { position: [c.xmax, c.ymin, c.zmin] },
  27             Vertex { position: [c.xmax, c.ymax, c.zmin] },
  28             Vertex { position: [c.xmin, c.ymax, c.zmin] },
  29             Vertex { position: [c.xmin, c.ymin, c.zmax] },
  30             Vertex { position: [c.xmax, c.ymin, c.zmax] },
  31             Vertex { position: [c.xmax, c.ymax, c.zmax] },
  32             Vertex { position: [c.xmin, c.ymax, c.zmax] },
  33         ];
  34
  35         const INDICES: &[u16] = &[0, 1, 1, 2, 2, 3, 3, 0,   // front
  36                                   4, 5, 5, 6, 6, 7, 7, 4,   // back
  37                                   0, 4, 1, 5, 2, 6, 3, 7];  // sides
  38
  39         BoundingBox {
  40             vertexes: glium::VertexBuffer::new(display, &vertex_data).unwrap(),
  41             program: program,
  42             indices:  IndexBuffer::new(display, PrimitiveType::LinesList, INDICES).unwrap(),
  43         }
  44     }
  45
  46     pub fn draw<U>(&self, frame: &mut glium::Frame,
  47                    uniforms: &U) where U: glium::uniforms::Uniforms {
  48         let params = glium::DrawParameters {
  49             depth: glium::Depth {
  50                 test: glium::draw_parameters::DepthTest::IfLess,
  51                 write: true,
  52                 ..Default::default()
  53             },
  54             blend: glium::Blend::alpha_blending(),
  55             ..Default::default()
  56         };
  57         frame.draw(&self.vertexes, &self.indices, self.program, uniforms, &params).unwrap();
  58     }
  59 }