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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 canvas_traits::webgl::{WebGLBufferId, WebGLCommand, WebGLError, WebGLMsgSender, WebGLResult, WebGLVertexArrayId};
use canvas_traits::webgl::webgl_channel;
use dom::bindings::cell::DomRefCell;
use dom::bindings::codegen::Bindings::WebGLBufferBinding;
use dom::bindings::reflector::reflect_dom_object;
use dom::bindings::root::DomRoot;
use dom::webglobject::WebGLObject;
use dom::window::Window;
use dom_struct::dom_struct;
use std::cell::Cell;
use std::collections::HashSet;
#[dom_struct]
pub struct WebGLBuffer {
webgl_object: WebGLObject,
id: WebGLBufferId,
/// The target to which this buffer was bound the first time
target: Cell<Option<u32>>,
capacity: Cell<usize>,
is_deleted: Cell<bool>,
// The Vertex Array Objects that are referencing this buffer
vao_references: DomRefCell<Option<HashSet<WebGLVertexArrayId>>>,
pending_delete: Cell<bool>,
#[ignore_heap_size_of = "Defined in ipc-channel"]
renderer: WebGLMsgSender,
}
impl WebGLBuffer {
fn new_inherited(renderer: WebGLMsgSender,
id: WebGLBufferId)
-> WebGLBuffer {
WebGLBuffer {
webgl_object: WebGLObject::new_inherited(),
id: id,
target: Cell::new(None),
capacity: Cell::new(0),
is_deleted: Cell::new(false),
vao_references: DomRefCell::new(None),
pending_delete: Cell::new(false),
renderer: renderer,
}
}
pub fn maybe_new(window: &Window, renderer: WebGLMsgSender)
-> Option<DomRoot<WebGLBuffer>> {
let (sender, receiver) = webgl_channel().unwrap();
renderer.send(WebGLCommand::CreateBuffer(sender)).unwrap();
let result = receiver.recv().unwrap();
result.map(|buffer_id| WebGLBuffer::new(window, renderer, buffer_id))
}
pub fn new(window: &Window,
renderer: WebGLMsgSender,
id: WebGLBufferId)
-> DomRoot<WebGLBuffer> {
reflect_dom_object(Box::new(WebGLBuffer::new_inherited(renderer, id)),
window, WebGLBufferBinding::Wrap)
}
}
impl WebGLBuffer {
pub fn id(&self) -> WebGLBufferId {
self.id
}
// NB: Only valid buffer targets come here
pub 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));
}
let msg = WebGLCommand::BindBuffer(target, Some(self.id));
self.renderer.send(msg).unwrap();
Ok(())
}
pub fn buffer_data(&self, target: u32, data: &[u8], usage: u32) -> WebGLResult<()> {
if let Some(previous_target) = self.target.get() {
if target != previous_target {
return Err(WebGLError::InvalidOperation);
}
}
self.capacity.set(data.len());
self.renderer.send(WebGLCommand::BufferData(target, data.to_vec(), usage)).unwrap();
Ok(())
}
pub fn capacity(&self) -> usize {
self.capacity.get()
}
pub fn delete(&self) {
if !self.is_deleted.get() {
self.is_deleted.set(true);
let _ = self.renderer.send(WebGLCommand::DeleteBuffer(self.id));
}
}
pub fn is_deleted(&self) -> bool {
self.is_deleted.get()
}
pub fn target(&self) -> Option<u32> {
self.target.get()
}
pub fn is_attached_to_vao(&self) -> bool {
self.vao_references.borrow().as_ref().map_or(false, |vaos| !vaos.is_empty())
}
pub fn set_pending_delete(&self) {
self.pending_delete.set(true);
}
pub fn add_vao_reference(&self, id: WebGLVertexArrayId) {
let mut vao_refs = self.vao_references.borrow_mut();
if let Some(ref mut vao_refs) = *vao_refs {
vao_refs.insert(id);
return;
}
let mut map = HashSet::new();
map.insert(id);
*vao_refs = Some(map);
}
pub fn remove_vao_reference(&self, id: WebGLVertexArrayId) {
if let Some(ref mut vao_refs) = *self.vao_references.borrow_mut() {
if vao_refs.take(&id).is_some() && self.pending_delete.get() {
// WebGL spec: The deleted buffers should no longer be valid when the VAOs are deleted
let _ = self.renderer.send(WebGLCommand::DeleteBuffer(self.id));
self.is_deleted.set(true);
}
}
}
}
impl Drop for WebGLBuffer {
fn drop(&mut self) {
self.delete();
}
}
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