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use std::marker::PhantomData;
use std::borrow::BorrowMut;
use gl;
use gl::types::*;
use context::{AContext, BaseContext, ContextOf};
use renderbuffer::{Renderbuffer, RenderbufferTarget};
use image_data::{RenderbufferFormat};
use types::{GLObject, GLError};
pub struct RenderbufferBuilder<C>
where C: RenderbufferContext
{
gl: C,
storage_params: Option<(RenderbufferFormat, u32, u32)>
}
impl<C> RenderbufferBuilder<C>
where C: RenderbufferContext
{
fn new(gl: C) -> Self {
RenderbufferBuilder {
gl: gl,
storage_params: None
}
}
pub fn storage(mut self,
format: RenderbufferFormat,
width: u32,
height: u32)
-> Self
{
self.storage_params = Some((format, width, height));
self
}
pub fn try_unwrap(self) -> Result<Renderbuffer, GLError> {
let gl = self.gl;
let mut rbo = unsafe { gl.gen_renderbuffer() };
match self.storage_params {
Some((format, width, height)) => {
{
let (mut gl_rbo, gl) = gl.bind_renderbuffer(&mut rbo);
gl.storage(&mut gl_rbo, format, width, height);
}
Ok(rbo)
},
None => {
let msg = "Error building renderbuffer: no format or dimensions provided";
Err(GLError::Message(msg.to_owned()))
}
}
}
pub fn unwrap(self) -> Renderbuffer {
self.try_unwrap().unwrap()
}
}
pub trait ContextRenderbufferBuilderExt: RenderbufferContext + Sized {
fn build_renderbuffer(self) -> RenderbufferBuilder<Self> {
RenderbufferBuilder::new(self)
}
}
impl<'a, C: 'a> ContextRenderbufferBuilderExt for &'a mut C
where &'a mut C: RenderbufferContext
{
}
pub trait ContextRenderbufferExt: BaseContext {
unsafe fn gen_renderbuffer(&self) -> Renderbuffer {
let mut id : GLuint = 0;
gl::GenRenderbuffers(1, &mut id as *mut GLuint);
dbg_gl_sanity_check! {
GLError::InvalidValue => "`n` is negative",
_ => "Unknown error"
}
Renderbuffer::from_raw(id)
}
fn storage(&self,
gl_rbo: &mut RenderbufferBinding,
format: RenderbufferFormat,
width: u32,
height: u32)
{
unsafe {
gl::RenderbufferStorage(gl_rbo.target().gl_enum(),
format.gl_enum(),
width as GLint,
height as GLint);
dbg_gl_sanity_check! {
GLError::InvalidEnum => "`target` is not `GL_RENDERBUFFER` or `internalformat` is not an accepted format",
GLError::InvalidValue => "`width` or `height` is less than zero or greater than `GL_MAX_RENDERBUFFER_SIZE`",
GLError::OutOfMemory => "Unable to allocate enough memory for requested size",
GLError::InvalidOperation => "Renderbuffer object 0 is bound",
_ => "Unknown error"
}
}
}
}
impl<C: BaseContext> ContextRenderbufferExt for C {
}
pub trait RenderbufferContext: AContext {
type Binder: BorrowMut<RenderbufferBinder>;
type Rest: AContext;
fn split_renderbuffer(self) -> (Self::Binder, Self::Rest);
fn bind_renderbuffer<'a>(self, rbo: &'a mut Renderbuffer)
-> (RenderbufferBinding<'a>, Self::Rest)
where Self: Sized
{
let (mut binder, rest) = self.split_renderbuffer();
(binder.borrow_mut().bind(rbo), rest)
}
}
impl<B, F, P, R, T> RenderbufferContext for ContextOf<B, F, P, R, T>
where R: BorrowMut<RenderbufferBinder>
{
type Binder = R;
type Rest = ContextOf<B, F, P, (), T>;
fn split_renderbuffer(self) -> (Self::Binder, Self::Rest) {
self.swap_renderbuffer(())
}
}
impl<'a, B, F, P, R, T> RenderbufferContext
for &'a mut ContextOf<B, F, P, R, T>
where R: BorrowMut<RenderbufferBinder>
{
type Binder = &'a mut RenderbufferBinder;
type Rest = ContextOf<&'a mut B, &'a mut F, &'a mut P, (), &'a mut T>;
fn split_renderbuffer(self) -> (Self::Binder, Self::Rest) {
let gl = self.borrowed_mut();
gl.swap_renderbuffer(())
}
}
pub struct RenderbufferBinding<'a> {
_phantom_ref: PhantomData<&'a mut Renderbuffer>,
_phantom_ptr: PhantomData<*mut ()>
}
impl<'a> RenderbufferBinding<'a> {
fn target(&self) -> RenderbufferTarget {
RenderbufferTarget::Renderbuffer
}
}
pub struct RenderbufferBinder {
_phantom: PhantomData<*mut ()>
}
impl RenderbufferBinder {
pub unsafe fn current() -> Self {
RenderbufferBinder {
_phantom: PhantomData
}
}
pub fn bind<'a>(&mut self, renderbuffer: &'a mut Renderbuffer)
-> RenderbufferBinding<'a>
{
let binding = RenderbufferBinding {
_phantom_ref: PhantomData,
_phantom_ptr: PhantomData
};
unsafe {
gl::BindRenderbuffer(binding.target().gl_enum(),
renderbuffer.id());
dbg_gl_sanity_check! {
GLError::InvalidEnum => "`target` is not `GL_RENDERBUFFER`",
_ => "Unknown error"
}
}
binding
}
}