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#[phase(plugin)]
extern crate gl_generator;
use glutin;
#[cfg(not(target_os = "android"))]
mod gl {
generate_gl_bindings!("gl", "core", "1.1", "struct")
}
#[cfg(target_os = "android")]
mod gl {
pub use self::Gles1 as Gl;
generate_gl_bindings!("gles1", "core", "1.1", "struct")
}
pub struct Context {
gl: gl::Gl
}
pub fn load(window: &glutin::Window) -> Context {
let gl = gl::Gl::load_with(|symbol| window.get_proc_address(symbol));
let version = {
use std::c_str::CString;
unsafe { CString::new(gl.GetString(gl::VERSION) as *const i8, false) }
};
println!("OpenGL version {}", version.as_str().unwrap());
Context { gl: gl }
}
impl Context {
#[cfg(not(target_os = "android"))]
pub fn draw_frame(&self, color: (f32, f32, f32, f32)) {
self.gl.ClearColor(color.0, color.1, color.2, color.3);
self.gl.Clear(gl::COLOR_BUFFER_BIT);
self.gl.Begin(gl::TRIANGLES);
self.gl.Color3f(1.0, 0.0, 0.0);
self.gl.Vertex2f(-0.5, -0.5);
self.gl.Color3f(0.0, 1.0, 0.0);
self.gl.Vertex2f(0.0, 0.5);
self.gl.Color3f(0.0, 0.0, 1.0);
self.gl.Vertex2f(0.5, -0.5);
self.gl.End();
}
#[cfg(target_os = "android")]
pub fn draw_frame(&self, color: (f32, f32, f32, f32)) {
self.gl.ClearColor(color.0, color.1, color.2, color.3);
self.gl.Clear(gl::COLOR_BUFFER_BIT);
let vertex_data: [f32, ..15] = [
-0.5, -0.5, 1.0, 0.0, 0.0,
0.0, 0.5, 0.0, 1.0, 0.0,
0.5, -0.5, 0.0, 0.0, 1.0
];
self.gl.EnableClientState(gl::VERTEX_ARRAY);
self.gl.EnableClientState(gl::COLOR_ARRAY);
unsafe {
use std::mem;
self.gl.VertexPointer(2, gl::FLOAT, (mem::size_of::<f32>() * 5) as i32,
mem::transmute(vertex_data.as_slice().as_ptr()));
self.gl.ColorPointer(3, gl::FLOAT, (mem::size_of::<f32>() * 5) as i32,
mem::transmute(vertex_data.as_slice().as_ptr().offset(2)));
}
self.gl.DrawArrays(gl::TRIANGLES, 0, 3);
self.gl.DisableClientState(gl::VERTEX_ARRAY);
self.gl.DisableClientState(gl::COLOR_ARRAY);
}
}
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