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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/. */
use super::webgl_thread::{GLState, WebGLImpl};
use canvas_traits::webgl::{WebGLCommand, WebGLCommandBacktrace, WebGLVersion};
use compositing::compositor_thread::{self, CompositorProxy};
use euclid::Size2D;
use gleam::gl;
use offscreen_gl_context::{
ColorAttachmentType, GLContext, GLContextAttributes, GLContextDispatcher,
};
use offscreen_gl_context::{GLLimits, GLVersion};
use offscreen_gl_context::{NativeGLContext, NativeGLContextHandle, NativeGLContextMethods};
use offscreen_gl_context::{OSMesaContext, OSMesaContextHandle};
use std::sync::{Arc, Mutex};
/// The GLContextFactory is used to create shared GL contexts with the main thread GL context.
/// Currently, shared textures are used to render WebGL textures into the WR compositor.
/// In order to create a shared context, the GLContextFactory stores the handle of the main GL context.
pub enum GLContextFactory {
Native(NativeGLContextHandle, Option<MainThreadDispatcher>),
OSMesa(OSMesaContextHandle),
}
impl GLContextFactory {
/// Creates a new GLContextFactory that uses the currently bound GL context to create shared contexts.
pub fn current_native_handle(proxy: &CompositorProxy) -> Option<GLContextFactory> {
// FIXME(emilio): This assumes a single GL backend per platform which is
// not true on Linux, we probably need a third `Egl` variant or abstract
// it a bit more...
NativeGLContext::current_handle().map(|handle| {
if cfg!(target_os = "windows") {
// Used to dispatch functions from the GLContext thread to the main thread's event loop.
// Required to allow WGL GLContext sharing in Windows.
GLContextFactory::Native(handle, Some(MainThreadDispatcher::new(proxy.clone())))
} else {
GLContextFactory::Native(handle, None)
}
})
}
/// Creates a new GLContextFactory that uses the currently bound OSMesa context to create shared contexts.
pub fn current_osmesa_handle() -> Option<GLContextFactory> {
OSMesaContext::current_handle().map(GLContextFactory::OSMesa)
}
/// Creates a new shared GLContext with the main GLContext
pub fn new_shared_context(
&self,
webgl_version: WebGLVersion,
size: Size2D<u32>,
attributes: GLContextAttributes,
) -> Result<GLContextWrapper, &'static str> {
Ok(match *self {
GLContextFactory::Native(ref handle, ref dispatcher) => {
let dispatcher = dispatcher.as_ref().map(|d| Box::new(d.clone()) as Box<_>);
GLContextWrapper::Native(GLContext::new_shared_with_dispatcher(
// FIXME(nox): Why are those i32 values?
size.to_i32(),
attributes,
ColorAttachmentType::Texture,
gl::GlType::default(),
Self::gl_version(webgl_version),
Some(handle),
dispatcher,
)?)
},
GLContextFactory::OSMesa(ref handle) => {
GLContextWrapper::OSMesa(GLContext::new_shared_with_dispatcher(
// FIXME(nox): Why are those i32 values?
size.to_i32(),
attributes,
ColorAttachmentType::Texture,
gl::GlType::default(),
Self::gl_version(webgl_version),
Some(handle),
None,
)?)
},
})
}
/// Creates a new non-shared GLContext
pub fn new_context(
&self,
webgl_version: WebGLVersion,
size: Size2D<u32>,
attributes: GLContextAttributes,
) -> Result<GLContextWrapper, &'static str> {
Ok(match *self {
GLContextFactory::Native(..) => {
GLContextWrapper::Native(GLContext::new_shared_with_dispatcher(
// FIXME(nox): Why are those i32 values?
size.to_i32(),
attributes,
ColorAttachmentType::Texture,
gl::GlType::default(),
Self::gl_version(webgl_version),
None,
None,
)?)
},
GLContextFactory::OSMesa(_) => {
GLContextWrapper::OSMesa(GLContext::new_shared_with_dispatcher(
// FIXME(nox): Why are those i32 values?
size.to_i32(),
attributes,
ColorAttachmentType::Texture,
gl::GlType::default(),
Self::gl_version(webgl_version),
None,
None,
)?)
},
})
}
fn gl_version(webgl_version: WebGLVersion) -> GLVersion {
match webgl_version {
WebGLVersion::WebGL1 => GLVersion::Major(2),
WebGLVersion::WebGL2 => GLVersion::Major(3),
}
}
}
/// GLContextWrapper used to abstract NativeGLContext and OSMesaContext types
pub enum GLContextWrapper {
Native(GLContext<NativeGLContext>),
OSMesa(GLContext<OSMesaContext>),
}
impl GLContextWrapper {
pub fn make_current(&self) {
match *self {
GLContextWrapper::Native(ref ctx) => {
ctx.make_current().unwrap();
},
GLContextWrapper::OSMesa(ref ctx) => {
ctx.make_current().unwrap();
},
}
}
pub fn unbind(&self) {
match *self {
GLContextWrapper::Native(ref ctx) => {
ctx.unbind().unwrap();
},
GLContextWrapper::OSMesa(ref ctx) => {
ctx.unbind().unwrap();
},
}
}
pub fn apply_command(
&self,
cmd: WebGLCommand,
backtrace: WebGLCommandBacktrace,
state: &mut GLState,
) {
match *self {
GLContextWrapper::Native(ref ctx) => {
WebGLImpl::apply(ctx, state, cmd, backtrace);
},
GLContextWrapper::OSMesa(ref ctx) => {
WebGLImpl::apply(ctx, state, cmd, backtrace);
},
}
}
pub fn gl(&self) -> &gl::Gl {
match *self {
GLContextWrapper::Native(ref ctx) => ctx.gl(),
GLContextWrapper::OSMesa(ref ctx) => ctx.gl(),
}
}
pub fn get_info(&self) -> (Size2D<i32>, u32, GLLimits) {
match *self {
GLContextWrapper::Native(ref ctx) => {
let (real_size, texture_id) = {
let draw_buffer = ctx.borrow_draw_buffer().unwrap();
(
draw_buffer.size(),
draw_buffer.get_bound_texture_id().unwrap(),
)
};
let limits = ctx.borrow_limits().clone();
(real_size, texture_id, limits)
},
GLContextWrapper::OSMesa(ref ctx) => {
let (real_size, texture_id) = {
let draw_buffer = ctx.borrow_draw_buffer().unwrap();
(
draw_buffer.size(),
draw_buffer.get_bound_texture_id().unwrap(),
)
};
let limits = ctx.borrow_limits().clone();
(real_size, texture_id, limits)
},
}
}
pub fn resize(&mut self, size: Size2D<u32>) -> Result<(), &'static str> {
match *self {
GLContextWrapper::Native(ref mut ctx) => {
// FIXME(nox): Why are those i32 values?
ctx.resize(size.to_i32())
},
GLContextWrapper::OSMesa(ref mut ctx) => {
// FIXME(nox): Why are those i32 values?
ctx.resize(size.to_i32())
},
}
}
}
/// Implements GLContextDispatcher to dispatch functions from GLContext threads to the main thread's event loop.
/// It's used in Windows to allow WGL GLContext sharing.
#[derive(Clone)]
pub struct MainThreadDispatcher {
compositor_proxy: Arc<Mutex<CompositorProxy>>,
}
impl MainThreadDispatcher {
fn new(proxy: CompositorProxy) -> Self {
Self {
compositor_proxy: Arc::new(Mutex::new(proxy)),
}
}
}
impl GLContextDispatcher for MainThreadDispatcher {
fn dispatch(&self, f: Box<Fn() + Send>) {
self.compositor_proxy
.lock()
.unwrap()
.send(compositor_thread::Msg::Dispatch(f));
}
}
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