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use std::ffi::{c_void, CString};
use std::process::abort;
use glfw::WindowSize;
use crate::opengl::shader::Program as ShaderProgram;
use crate::opengl::vertex_array::{PrimitiveKind, VertexArray};
use crate::opengl::vertex_buffer::{BufferUsage, VertexBuffer};
use crate::opengl::{clear_buffers, BufferClearMask};
use crate::vector::Vec2;
use crate::vertex::Vertex;
pub fn initialize(window: &glfw::Window) -> Result<(), Error>
{
gl::load_with(|symbol| {
let proc_name = unsafe { CString::from_vec_unchecked(symbol.into()) };
match window.get_proc_address(proc_name.as_c_str()) {
Ok(addr) => addr as *const c_void,
Err(err) => {
println!(
"FATAL ERROR: Failed to get adress of OpenGL function {}. {}",
symbol, err
);
abort();
}
}
});
let window_size = window.size().map_err(Error::GetWindowSizeFailed)?;
set_viewport(&Vec2 { x: 0, y: 0 }, &window_size);
Ok(())
}
pub fn render<'renderable>(renderables: impl IntoIterator<Item = &'renderable Renderable>)
{
clear_buffers(BufferClearMask::COLOR);
for renderable in renderables {
renderable.shader_program.activate();
renderable.vertex_arr.bind(|vert_arr_curr_bound| {
VertexArray::draw(&vert_arr_curr_bound, PrimitiveKind::Triangles, 0, 3);
});
}
}
pub fn set_viewport(position: &Vec2<u32>, size: &WindowSize)
{
crate::opengl::set_viewport(position, size);
}
#[derive(Debug)]
pub struct Renderable
{
shader_program: ShaderProgram,
vertex_arr: VertexArray,
/// Vertex buffer has to live as long as the vertex array
_vertex_buffer: VertexBuffer,
}
impl Renderable
{
pub fn new(shader_program: ShaderProgram, vertices: &[Vertex]) -> Self
{
let vertex_arr = VertexArray::new();
let vertex_buffer = VertexBuffer::new();
vertex_arr.bind(|vert_arr_curr_bound| {
vertex_buffer.bind(|vert_buf_curr_bound| {
VertexBuffer::store(&vert_buf_curr_bound, vertices, BufferUsage::Static);
VertexArray::configure_attrs(&vert_arr_curr_bound, &vert_buf_curr_bound);
});
});
Self {
shader_program,
vertex_arr,
_vertex_buffer: vertex_buffer,
}
}
}
/// Renderer error.
#[derive(Debug, thiserror::Error)]
pub enum Error
{
#[error("Failed to get window size")]
GetWindowSizeFailed(#[source] glfw::Error),
}
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