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use std::mem::size_of_val;
#[derive(Debug)]
pub struct VertexBuffers<const CNT: usize>
{
buffers: [gl::types::GLuint; CNT],
}
impl<const CNT: usize> VertexBuffers<CNT>
{
pub fn new() -> Self
{
let mut buffers = [gl::types::GLuint::default(); CNT];
unsafe {
#[allow(clippy::cast_possible_wrap, clippy::cast_possible_truncation)]
gl::GenBuffers(CNT as gl::types::GLsizei, buffers.as_mut_ptr());
};
Self { buffers }
}
pub fn store(
&self,
buffer_index: usize,
vertices: &[f32],
usage: BufferUsage,
) -> Option<()>
{
let buffer = *self.buffers.get(buffer_index)?;
unsafe {
gl::BindBuffer(gl::ARRAY_BUFFER, buffer);
}
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(),
);
}
Some(())
}
}
impl<const CNT: usize> Drop for VertexBuffers<CNT>
{
fn drop(&mut self)
{
#[allow(clippy::cast_possible_wrap, clippy::cast_possible_truncation)]
unsafe {
gl::DeleteBuffers(CNT as gl::types::GLsizei, self.buffers.as_ptr());
}
}
}
#[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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