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#[macro_use]
extern crate glium;
fn main() {
use glium::DisplayBuild;
use glium::Surface;
let display = glium::glutin::WindowBuilder::new()
.with_dimensions(1024, 768)
.with_title(format!("Hello world"))
.build_glium()
.unwrap();
#[derive(Copy, Clone)]
struct Vertex {
position: [f32; 2],
}
implement_vertex!(Vertex, position);
let vertex1 = Vertex { position: [-0.5, -0.5] };
let vertex2 = Vertex { position: [ 0.0, 0.5] };
let vertex3 = Vertex { position: [ 0.5, -0.25] };
let shape = vec![vertex1, vertex2, vertex3];
let vertex_buffer = glium::VertexBuffer::new(&display, &shape).unwrap();
let indices = glium::index::NoIndices(glium::index::PrimitiveType::TrianglesList);
let vertex_shader_src = r#"
#version 140
in vec2 position;
out vec2 my_attr;
uniform mat4 trans;
void main() {
my_attr = position;
gl_Position = trans * vec4(position, 0.0, 1.0);
}
"#;
let fragment_shader_src = r#"
#version 140
in vec2 my_attr;
out vec4 color;
void main() {
color = vec4(my_attr, 0.0, 1.0);
}
"#;
let program = glium::Program::from_source(
&display, vertex_shader_src, fragment_shader_src, None).unwrap();
let mut t: f32 = -0.5;
loop {
t += 0.002;
if t > 0.5 {
t = -0.5;
}
let uniforms = uniform! {
trans: [
[t.cos(), t.sin(), 0.0, 0.0],
[-t.sin(), t.cos(), 0.0, 0.0],
[1.0, 0.0, 1.0, 0.0],
[t, 0.0, 0.0, 1.0f32],
]
};
let mut target = display.draw();
target.clear_color(0.0, 0.0, 0.0, 1.0);
target.draw(&vertex_buffer, &indices, &program, &uniforms,
&Default::default()).unwrap();
target.finish().unwrap();
for ev in display.poll_events() {
match ev {
glium::glutin::Event::Closed => return,
_ => ()
}
}
}
}
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