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use std::mem::size_of_val;
use crate::opengl::currently_bound::CurrentlyBound;
use crate::vertex::Vertex;
#[derive(Debug)]
pub struct VertexBuffer
{
buffer: gl::types::GLuint,
}
impl VertexBuffer
{
pub fn new() -> Self
{
let mut buffer = gl::types::GLuint::default();
unsafe {
gl::GenBuffers(1, &mut buffer);
};
Self { buffer }
}
#[allow(clippy::inline_always)]
#[inline(always)]
pub fn bind(&self, cb: impl FnOnce(CurrentlyBound<'_, Self>))
{
unsafe {
gl::BindBuffer(gl::ARRAY_BUFFER, self.buffer);
}
// SAFETY: A vertex array object is currently bound
let currently_bound = unsafe { CurrentlyBound::new() };
cb(currently_bound);
}
/// Stores vertices in the currently bound vertex bound.
pub fn store(
_currently_bound: &CurrentlyBound<Self>,
vertices: &[Vertex],
usage: BufferUsage,
)
{
unsafe {
#[allow(clippy::cast_possible_wrap)]
gl::BufferData(
gl::ARRAY_BUFFER,
size_of_val(vertices) as gl::types::GLsizeiptr,
vertices.as_ptr().cast(),
usage.into_gl(),
);
}
}
}
impl Drop for VertexBuffer
{
fn drop(&mut self)
{
#[allow(clippy::cast_possible_wrap, clippy::cast_possible_truncation)]
unsafe {
gl::DeleteBuffers(1, &self.buffer);
}
}
}
#[derive(Debug)]
#[allow(dead_code)]
pub enum BufferUsage
{
/// The buffer data is set only once and used by the GPU at most a few times.
Stream,
/// The buffer data is set only once and used many times.
Static,
/// The buffer data is changed a lot and used many times.
Dynamic,
}
impl BufferUsage
{
fn into_gl(self) -> gl::types::GLenum
{
match self {
Self::Stream => gl::STREAM_DRAW,
Self::Static => gl::STATIC_DRAW,
Self::Dynamic => gl::DYNAMIC_DRAW,
}
}
}
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