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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
// https://www.khronos.org/registry/webgl/specs/latest/1.0/webgl.idl
use dom::bindings::codegen::Bindings::WebGLBufferBinding;
use dom::bindings::global::GlobalRef;
use dom::bindings::js::Root;
use dom::bindings::utils::reflect_dom_object;
use dom::webglobject::WebGLObject;
use canvas_traits::{CanvasMsg, CanvasWebGLMsg, WebGLError, WebGLResult};
use ipc_channel::ipc::{self, IpcSender};
use std::cell::Cell;
#[dom_struct]
pub struct WebGLBuffer {
webgl_object: WebGLObject,
id: u32,
/// The target to which this buffer was bound the first time
target: Cell<Option<u32>>,
is_deleted: Cell<bool>,
#[ignore_heap_size_of = "Defined in ipc-channel"]
renderer: IpcSender<CanvasMsg>,
}
impl WebGLBuffer {
fn new_inherited(renderer: IpcSender<CanvasMsg>, id: u32) -> WebGLBuffer {
WebGLBuffer {
webgl_object: WebGLObject::new_inherited(),
id: id,
target: Cell::new(None),
is_deleted: Cell::new(false),
renderer: renderer,
}
}
pub fn maybe_new(global: GlobalRef, renderer: IpcSender<CanvasMsg>)
-> Option<Root<WebGLBuffer>> {
let (sender, receiver) = ipc::channel().unwrap();
renderer.send(CanvasMsg::WebGL(CanvasWebGLMsg::CreateBuffer(sender))).unwrap();
let result = receiver.recv().unwrap();
result.map(|buffer_id| WebGLBuffer::new(global, renderer, *buffer_id))
}
pub fn new(global: GlobalRef, renderer: IpcSender<CanvasMsg>, id: u32) -> Root<WebGLBuffer> {
reflect_dom_object(box WebGLBuffer::new_inherited(renderer, id), global, WebGLBufferBinding::Wrap)
}
}
pub trait WebGLBufferHelpers {
fn id(self) -> u32;
fn bind(self, target: u32) -> WebGLResult<()>;
fn delete(self);
}
impl<'a> WebGLBufferHelpers for &'a WebGLBuffer {
fn id(self) -> u32 {
self.id
}
// NB: Only valid buffer targets come here
fn bind(self, target: u32) -> WebGLResult<()> {
if let Some(previous_target) = self.target.get() {
if target != previous_target {
return Err(WebGLError::InvalidOperation);
}
} else {
self.target.set(Some(target));
}
self.renderer.send(CanvasMsg::WebGL(CanvasWebGLMsg::BindBuffer(target, self.id))).unwrap();
Ok(())
}
fn delete(self) {
if !self.is_deleted.get() {
self.is_deleted.set(true);
self.renderer.send(CanvasMsg::WebGL(CanvasWebGLMsg::DeleteBuffer(self.id))).unwrap();
}
}
}
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