gl_helpers 0.1.1

gl helpers
Documentation 
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use core::ops::Drop;

use gl;
use gl::types::*;

use super::{DataFormat, Attachment};


pub struct GLRenderbuffer {
    id: GLuint,
}

impl GLRenderbuffer {
    #[inline(always)]
    pub fn new(format: DataFormat, attachment: Attachment, width: usize, height: usize) -> Self {
        let renderbuffer = GLRenderbuffer {
            id: {
                let mut id = 0;
                unsafe { gl::GenRenderbuffers(1, &mut id); }
                id
            },
        };

        renderbuffer.set(format, attachment, width, height);
        renderbuffer
    }
    #[inline(always)]
    pub fn id(&self) -> GLuint { self.id }

    #[inline]
    pub fn bind(&self) -> &Self {
        unsafe { gl::BindRenderbuffer(gl::RENDERBUFFER, self.id); }
        self
    }
    #[inline]
    pub fn unbind(&self) -> &Self {
        unsafe { gl::BindRenderbuffer(gl::RENDERBUFFER, 0); }
        self
    }

    #[inline]
    pub fn set(&self, format: DataFormat, attachment: Attachment, width: usize, height: usize) {
        let format = format.to_gl();
        let attachment = attachment.to_gl();

        unsafe {
            gl::BindRenderbuffer(gl::RENDERBUFFER, self.id);
            gl::RenderbufferStorage(gl::RENDERBUFFER, format, width as GLint, height as GLint);
            gl::FramebufferRenderbuffer(gl::FRAMEBUFFER, attachment, gl::RENDERBUFFER, self.id);
        }
    }
}

impl Drop for GLRenderbuffer {
    #[inline]
    fn drop(&mut self) {
        if self.id != 0 {
            unsafe { gl::DeleteRenderbuffers(1, &self.id); }
        }
    }
}