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