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use std::ffi::{c_float, c_void, CString};
use std::mem::size_of;
use std::process::abort;
use std::ptr::null;
use glfw::WindowSize;
use crate::renderer::vertex_array::{PrimitiveKind, VertexArray};
use crate::renderer::vertex_buffers::{BufferUsage, VertexBuffers};
use crate::vector::Vec2;
mod vertex_array;
mod vertex_buffers;
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>)
{
unsafe {
gl::Clear(gl::COLOR_BUFFER_BIT);
}
for renderable in renderables {
renderable.shader_program.activate();
renderable.vertex_arr.draw(PrimitiveKind::Triangles, 0, 3);
}
}
pub struct Renderable
{
shader_program: crate::shader::Program,
vertex_arr: VertexArray,
}
impl Renderable
{
pub fn new(shader_program: crate::shader::Program, vertices: &[f32]) -> Self
{
let vertex_arr = VertexArray::new();
vertex_arr.bind();
let vertex_buffer = VertexBuffers::<1>::new();
vertex_buffer
.store(0, vertices, BufferUsage::Static)
.unwrap();
vertex_attrib_ptr(0);
enable_vertex_attrib_array(0);
unsafe {
gl::BindBuffer(gl::ARRAY_BUFFER, 0);
gl::BindVertexArray(0);
}
Self {
shader_program,
vertex_arr,
}
}
}
pub fn set_viewport(position: &Vec2<u32>, size: &WindowSize)
{
unsafe {
#[allow(clippy::cast_possible_wrap)]
gl::Viewport(
position.x as i32,
position.y as i32,
size.width as i32,
size.height as i32,
);
}
}
/// Renderer error.
#[derive(Debug, thiserror::Error)]
pub enum Error
{
#[error("Failed to get window size")]
GetWindowSizeFailed(#[source] glfw::Error),
}
fn vertex_attrib_ptr(index: usize)
{
let stride = 3 * size_of::<c_float>();
unsafe {
#[allow(clippy::cast_possible_wrap, clippy::cast_possible_truncation)]
gl::VertexAttribPointer(
index as gl::types::GLuint,
3,
gl::FLOAT,
gl::FALSE,
stride as gl::types::GLsizei,
null(),
);
}
}
fn enable_vertex_attrib_array(index: usize)
{
unsafe {
#[allow(clippy::cast_possible_truncation)]
gl::EnableVertexAttribArray(index as gl::types::GLuint);
}
}
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