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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::WebGLProgramBinding;
use dom::bindings::global::GlobalRef;
use dom::bindings::js::{JS, MutNullableHeap, Root};
use dom::bindings::utils::reflect_dom_object;
use dom::webglobject::WebGLObject;
use dom::webglrenderingcontext::MAX_UNIFORM_AND_ATTRIBUTE_LEN;
use dom::webglshader::{WebGLShader, WebGLShaderHelpers};
use dom::bindings::codegen::Bindings::WebGLRenderingContextBinding::WebGLRenderingContextConstants as constants;
use canvas_traits::{CanvasMsg, CanvasWebGLMsg, WebGLResult, WebGLError};
use ipc_channel::ipc::{self, IpcSender};
use std::cell::Cell;
#[dom_struct]
pub struct WebGLProgram {
webgl_object: WebGLObject,
id: u32,
is_deleted: Cell<bool>,
fragment_shader: MutNullableHeap<JS<WebGLShader>>,
vertex_shader: MutNullableHeap<JS<WebGLShader>>,
#[ignore_heap_size_of = "Defined in ipc-channel"]
renderer: IpcSender<CanvasMsg>,
}
impl WebGLProgram {
fn new_inherited(renderer: IpcSender<CanvasMsg>, id: u32) -> WebGLProgram {
WebGLProgram {
webgl_object: WebGLObject::new_inherited(),
id: id,
is_deleted: Cell::new(false),
fragment_shader: Default::default(),
vertex_shader: Default::default(),
renderer: renderer,
}
}
pub fn maybe_new(global: GlobalRef, renderer: IpcSender<CanvasMsg>)
-> Option<Root<WebGLProgram>> {
let (sender, receiver) = ipc::channel().unwrap();
renderer.send(CanvasMsg::WebGL(CanvasWebGLMsg::CreateProgram(sender))).unwrap();
let result = receiver.recv().unwrap();
result.map(|program_id| WebGLProgram::new(global, renderer, *program_id))
}
pub fn new(global: GlobalRef, renderer: IpcSender<CanvasMsg>, id: u32) -> Root<WebGLProgram> {
reflect_dom_object(box WebGLProgram::new_inherited(renderer, id), global, WebGLProgramBinding::Wrap)
}
}
pub trait WebGLProgramHelpers {
fn delete(self);
fn link(self);
fn use_program(self);
fn attach_shader(self, shader: &WebGLShader) -> WebGLResult<()>;
fn get_attrib_location(self, name: String) -> WebGLResult<Option<i32>>;
fn get_uniform_location(self, name: String) -> WebGLResult<Option<i32>>;
}
impl<'a> WebGLProgramHelpers for &'a WebGLProgram {
/// glDeleteProgram
fn delete(self) {
if !self.is_deleted.get() {
self.is_deleted.set(true);
self.renderer.send(CanvasMsg::WebGL(CanvasWebGLMsg::DeleteProgram(self.id))).unwrap();
}
}
/// glLinkProgram
fn link(self) {
self.renderer.send(CanvasMsg::WebGL(CanvasWebGLMsg::LinkProgram(self.id))).unwrap();
}
/// glUseProgram
fn use_program(self) {
self.renderer.send(CanvasMsg::WebGL(CanvasWebGLMsg::UseProgram(self.id))).unwrap();
}
/// glAttachShader
fn attach_shader(self, shader: &WebGLShader) -> WebGLResult<()> {
let shader_slot = match shader.gl_type() {
constants::FRAGMENT_SHADER => &self.fragment_shader,
constants::VERTEX_SHADER => &self.vertex_shader,
_ => return Err(WebGLError::InvalidOperation),
};
// TODO(ecoal95): Differentiate between same shader already assigned and other previous
// shader.
if shader_slot.get().is_some() {
return Err(WebGLError::InvalidOperation);
}
shader_slot.set(Some(JS::from_ref(shader)));
self.renderer.send(CanvasMsg::WebGL(CanvasWebGLMsg::AttachShader(self.id, shader.id()))).unwrap();
Ok(())
}
/// glGetAttribLocation
fn get_attrib_location(self, name: String) -> WebGLResult<Option<i32>> {
if name.len() > MAX_UNIFORM_AND_ATTRIBUTE_LEN {
return Err(WebGLError::InvalidValue);
}
// Check if the name is reserved
if name.starts_with("webgl") || name.starts_with("_webgl_") {
return Ok(None);
}
let (sender, receiver) = ipc::channel().unwrap();
self.renderer.send(CanvasMsg::WebGL(CanvasWebGLMsg::GetAttribLocation(self.id, name, sender))).unwrap();
Ok(receiver.recv().unwrap())
}
/// glGetUniformLocation
fn get_uniform_location(self, name: String) -> WebGLResult<Option<i32>> {
if name.len() > MAX_UNIFORM_AND_ATTRIBUTE_LEN {
return Err(WebGLError::InvalidValue);
}
// Check if the name is reserved
if name.starts_with("webgl") || name.starts_with("_webgl_") {
return Ok(None);
}
let (sender, receiver) = ipc::channel().unwrap();
self.renderer.send(CanvasMsg::WebGL(CanvasWebGLMsg::GetUniformLocation(self.id, name, sender))).unwrap();
Ok(receiver.recv().unwrap())
}
}
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