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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();
// let display = glium::glutin::WindowBuilder::new().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;
uniform float t;
void main() {
vec2 p = position;
p.x += t;
gl_Position = vec4(p, 0.0, 1.0);
}
"#;
let fragment_shader_src = r#"
#version 140
out vec4 color;
void main() {
color = vec4(0.7, 0.3, 0.2, 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 mut target = display.draw();
target.clear_color(0.3, 0.3, 0.2, 1.0);
target.draw(&vertex_buffer, &indices, &program, &uniform! { t: t },
&Default::default()).unwrap();
target.finish().unwrap();
for ev in display.poll_events() {
match ev {
glium::glutin::Event::Closed => return,
_ => ()
}
}
}
}
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