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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 angle::hl::{BuiltInResources, Output, ShaderValidator};
use canvas_traits::webgl::{webgl_channel, WebGLCommand, WebGLMsgSender, WebGLParameter, WebGLResult, WebGLShaderId};
use canvas_traits::webgl::WebGLVersion;
use dom::bindings::cell::DomRefCell;
use dom::bindings::codegen::Bindings::WebGLShaderBinding;
use dom::bindings::reflector::reflect_dom_object;
use dom::bindings::root::DomRoot;
use dom::bindings::str::DOMString;
use dom::webgl_extensions::WebGLExtensions;
use dom::webgl_extensions::ext::oesstandardderivatives::OESStandardDerivatives;
use dom::webglobject::WebGLObject;
use dom::window::Window;
use dom_struct::dom_struct;
use std::cell::Cell;
use std::sync::{ONCE_INIT, Once};
#[derive(Clone, Copy, Debug, JSTraceable, MallocSizeOf, PartialEq)]
pub enum ShaderCompilationStatus {
NotCompiled,
Succeeded,
Failed,
}
#[dom_struct]
pub struct WebGLShader {
webgl_object: WebGLObject,
id: WebGLShaderId,
gl_type: u32,
source: DomRefCell<Option<DOMString>>,
info_log: DomRefCell<Option<String>>,
is_deleted: Cell<bool>,
attached_counter: Cell<u32>,
compilation_status: Cell<ShaderCompilationStatus>,
#[ignore_malloc_size_of = "Defined in ipc-channel"]
renderer: WebGLMsgSender,
}
#[cfg(not(target_os = "android"))]
const SHADER_OUTPUT_FORMAT: Output = Output::Glsl;
#[cfg(target_os = "android")]
const SHADER_OUTPUT_FORMAT: Output = Output::Essl;
static GLSLANG_INITIALIZATION: Once = ONCE_INIT;
impl WebGLShader {
fn new_inherited(renderer: WebGLMsgSender,
id: WebGLShaderId,
shader_type: u32)
-> WebGLShader {
GLSLANG_INITIALIZATION.call_once(|| ::angle::hl::initialize().unwrap());
WebGLShader {
webgl_object: WebGLObject::new_inherited(),
id: id,
gl_type: shader_type,
source: DomRefCell::new(None),
info_log: DomRefCell::new(None),
is_deleted: Cell::new(false),
attached_counter: Cell::new(0),
compilation_status: Cell::new(ShaderCompilationStatus::NotCompiled),
renderer: renderer,
}
}
pub fn maybe_new(window: &Window,
renderer: WebGLMsgSender,
shader_type: u32)
-> Option<DomRoot<WebGLShader>> {
let (sender, receiver) = webgl_channel().unwrap();
renderer.send(WebGLCommand::CreateShader(shader_type, sender)).unwrap();
let result = receiver.recv().unwrap();
result.map(|shader_id| WebGLShader::new(window, renderer, shader_id, shader_type))
}
pub fn new(window: &Window,
renderer: WebGLMsgSender,
id: WebGLShaderId,
shader_type: u32)
-> DomRoot<WebGLShader> {
reflect_dom_object(Box::new(WebGLShader::new_inherited(renderer, id, shader_type)),
window,
WebGLShaderBinding::Wrap)
}
}
impl WebGLShader {
pub fn id(&self) -> WebGLShaderId {
self.id
}
pub fn gl_type(&self) -> u32 {
self.gl_type
}
/// glCompileShader
pub fn compile(&self, version: WebGLVersion, ext: &WebGLExtensions) {
if self.compilation_status.get() != ShaderCompilationStatus::NotCompiled {
debug!("Compiling already compiled shader {}", self.id);
}
if let Some(ref source) = *self.source.borrow() {
let mut params = BuiltInResources::default();
params.FragmentPrecisionHigh = 1;
params.OES_standard_derivatives = ext.is_enabled::<OESStandardDerivatives>() as i32;
let validator = match version {
WebGLVersion::WebGL1 => {
ShaderValidator::for_webgl(self.gl_type,
SHADER_OUTPUT_FORMAT,
¶ms).unwrap()
},
WebGLVersion::WebGL2 => {
ShaderValidator::for_webgl2(self.gl_type,
SHADER_OUTPUT_FORMAT,
¶ms).unwrap()
},
};
match validator.compile_and_translate(&[source]) {
Ok(translated_source) => {
debug!("Shader translated: {}", translated_source);
// NOTE: At this point we should be pretty sure that the compilation in the paint thread
// will succeed.
// It could be interesting to retrieve the info log from the paint thread though
let msg = WebGLCommand::CompileShader(self.id, translated_source);
self.renderer.send(msg).unwrap();
self.compilation_status.set(ShaderCompilationStatus::Succeeded);
},
Err(error) => {
self.compilation_status.set(ShaderCompilationStatus::Failed);
debug!("Shader {} compilation failed: {}", self.id, error);
},
}
*self.info_log.borrow_mut() = Some(validator.info_log());
// TODO(emilio): More data (like uniform data) should be collected
// here to properly validate uniforms.
//
// This requires a more complex interface with ANGLE, using C++
// bindings and being extremely cautious about destructing things.
}
}
/// Mark this shader as deleted (if it wasn't previously)
/// and delete it as if calling glDeleteShader.
/// Currently does not check if shader is attached
pub fn delete(&self) {
if !self.is_deleted.get() {
self.is_deleted.set(true);
let _ = self.renderer.send(WebGLCommand::DeleteShader(self.id));
}
}
pub fn is_deleted(&self) -> bool {
self.is_deleted.get()
}
pub fn is_attached(&self) -> bool {
self.attached_counter.get() > 0
}
pub fn increment_attached_counter(&self) {
self.attached_counter.set(self.attached_counter.get() + 1);
}
pub fn decrement_attached_counter(&self) {
assert!(self.attached_counter.get() > 0);
self.attached_counter.set(self.attached_counter.get() - 1);
}
/// glGetShaderInfoLog
pub fn info_log(&self) -> Option<String> {
self.info_log.borrow().clone()
}
/// glGetParameter
pub fn parameter(&self, param_id: u32) -> WebGLResult<WebGLParameter> {
let (sender, receiver) = webgl_channel().unwrap();
self.renderer.send(WebGLCommand::GetShaderParameter(self.id, param_id, sender)).unwrap();
receiver.recv().unwrap()
}
/// Get the shader source
pub fn source(&self) -> Option<DOMString> {
self.source.borrow().clone()
}
/// glShaderSource
pub fn set_source(&self, source: DOMString) {
*self.source.borrow_mut() = Some(source);
}
pub fn successfully_compiled(&self) -> bool {
self.compilation_status.get() == ShaderCompilationStatus::Succeeded
}
}
impl Drop for WebGLShader {
fn drop(&mut self) {
assert!(self.attached_counter.get() == 0);
self.delete();
}
}
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