servo/components/webrender_surfman/lib.rs
2020-04-17 23:44:53 -05:00

213 lines
7.3 KiB
Rust

/* 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 https://mozilla.org/MPL/2.0/. */
#![deny(unsafe_code)]
use euclid::default::Size2D;
use std::cell::RefCell;
use std::ffi::c_void;
use std::rc::Rc;
use surfman::Adapter;
use surfman::Connection;
use surfman::Context;
use surfman::ContextAttributeFlags;
use surfman::ContextAttributes;
use surfman::Device;
use surfman::Error;
use surfman::GLApi;
use surfman::GLVersion;
use surfman::NativeContext;
use surfman::NativeDevice;
use surfman::NativeWidget;
use surfman::Surface;
use surfman::SurfaceAccess;
use surfman::SurfaceInfo;
use surfman::SurfaceTexture;
use surfman::SurfaceType;
use surfman_chains::SurfmanProvider;
use surfman_chains::SwapChain;
/// A bridge between webrender and surfman
// TODO: move this into a different crate so that script doesn't depend on surfman
#[derive(Clone)]
pub struct WebrenderSurfman(Rc<WebrenderSurfmanData>);
struct WebrenderSurfmanData {
device: RefCell<Device>,
context: RefCell<Context>,
// We either render to a swap buffer or to a native widget
swap_chain: Option<SwapChain<Device>>,
}
impl Drop for WebrenderSurfmanData {
fn drop(&mut self) {
let ref mut device = self.device.borrow_mut();
let ref mut context = self.context.borrow_mut();
if let Some(ref swap_chain) = self.swap_chain {
let _ = swap_chain.destroy(device, context);
}
let _ = device.destroy_context(context);
}
}
impl WebrenderSurfman {
pub fn create(
connection: &Connection,
adapter: &Adapter,
surface_type: SurfaceType<NativeWidget>,
) -> Result<Self, Error> {
let mut device = connection.create_device(&adapter)?;
let flags = ContextAttributeFlags::ALPHA |
ContextAttributeFlags::DEPTH |
ContextAttributeFlags::STENCIL;
let version = match connection.gl_api() {
GLApi::GLES => GLVersion { major: 3, minor: 0 },
GLApi::GL => GLVersion { major: 3, minor: 2 },
};
let context_attributes = ContextAttributes { flags, version };
let context_descriptor = device.create_context_descriptor(&context_attributes)?;
let mut context = device.create_context(&context_descriptor)?;
let surface_access = SurfaceAccess::GPUOnly;
let headless = match surface_type {
SurfaceType::Widget { .. } => false,
SurfaceType::Generic { .. } => true,
};
let surface = device.create_surface(&context, surface_access, surface_type)?;
device
.bind_surface_to_context(&mut context, surface)
.map_err(|(err, mut surface)| {
let _ = device.destroy_surface(&mut context, &mut surface);
err
})?;
let swap_chain = if headless {
let surface_provider = Box::new(SurfmanProvider::new(surface_access));
Some(SwapChain::create_attached(
&mut device,
&mut context,
surface_provider,
)?)
} else {
None
};
let device = RefCell::new(device);
let context = RefCell::new(context);
let data = WebrenderSurfmanData {
device,
context,
swap_chain,
};
Ok(WebrenderSurfman(Rc::new(data)))
}
pub fn create_surface_texture(
&self,
surface: Surface,
) -> Result<SurfaceTexture, (Error, Surface)> {
let ref device = self.0.device.borrow();
let ref mut context = self.0.context.borrow_mut();
device.create_surface_texture(context, surface)
}
pub fn destroy_surface_texture(
&self,
surface_texture: SurfaceTexture,
) -> Result<Surface, (Error, SurfaceTexture)> {
let ref device = self.0.device.borrow();
let ref mut context = self.0.context.borrow_mut();
device.destroy_surface_texture(context, surface_texture)
}
pub fn make_gl_context_current(&self) -> Result<(), Error> {
let ref device = self.0.device.borrow();
let ref context = self.0.context.borrow();
device.make_context_current(context)
}
pub fn swap_chain(&self) -> Result<&SwapChain<Device>, Error> {
self.0.swap_chain.as_ref().ok_or(Error::WidgetAttached)
}
pub fn resize(&self, size: Size2D<i32>) -> Result<(), Error> {
let ref mut device = self.0.device.borrow_mut();
let ref mut context = self.0.context.borrow_mut();
if let Some(swap_chain) = self.0.swap_chain.as_ref() {
return swap_chain.resize(device, context, size);
}
let mut surface = device.unbind_surface_from_context(context)?.unwrap();
device.resize_surface(context, &mut surface, size)?;
device
.bind_surface_to_context(context, surface)
.map_err(|(err, mut surface)| {
let _ = device.destroy_surface(context, &mut surface);
err
})
}
pub fn present(&self) -> Result<(), Error> {
let ref mut device = self.0.device.borrow_mut();
let ref mut context = self.0.context.borrow_mut();
if let Some(ref swap_chain) = self.0.swap_chain {
return swap_chain.swap_buffers(device, context);
}
let mut surface = device.unbind_surface_from_context(context)?.unwrap();
device.present_surface(context, &mut surface)?;
device
.bind_surface_to_context(context, surface)
.map_err(|(err, mut surface)| {
let _ = device.destroy_surface(context, &mut surface);
err
})
}
pub fn connection(&self) -> Connection {
let ref device = self.0.device.borrow();
device.connection()
}
pub fn adapter(&self) -> Adapter {
let ref device = self.0.device.borrow();
device.adapter()
}
pub fn native_context(&self) -> NativeContext {
let ref device = self.0.device.borrow();
let ref context = self.0.context.borrow();
device.native_context(context)
}
pub fn native_device(&self) -> NativeDevice {
let ref device = self.0.device.borrow();
device.native_device()
}
pub fn context_attributes(&self) -> ContextAttributes {
let ref device = self.0.device.borrow();
let ref context = self.0.context.borrow();
let ref descriptor = device.context_descriptor(context);
device.context_descriptor_attributes(descriptor)
}
pub fn context_surface_info(&self) -> Result<Option<SurfaceInfo>, Error> {
let ref device = self.0.device.borrow();
let ref context = self.0.context.borrow();
device.context_surface_info(context)
}
pub fn surface_info(&self, surface: &Surface) -> SurfaceInfo {
let ref device = self.0.device.borrow();
device.surface_info(surface)
}
pub fn surface_texture_object(&self, surface: &SurfaceTexture) -> u32 {
let ref device = self.0.device.borrow();
device.surface_texture_object(surface)
}
pub fn get_proc_address(&self, name: &str) -> *const c_void {
let ref device = self.0.device.borrow();
let ref context = self.0.context.borrow();
device.get_proc_address(context, name)
}
}