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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 mozangle::egl::ffi::*;
use std::os::raw::c_void;
use std::ptr;
use std::rc::Rc;
use winapi::um::d3d11::ID3D11Device;
use winapi::um::d3d11::ID3D11Texture2D;
pub use mozangle::egl::get_proc_address;
pub struct SharedEglThings {
device: EGLDeviceEXT,
display: types::EGLDisplay,
config: types::EGLConfig,
context: types::EGLContext,
}
fn cast_attributes(slice: &[types::EGLenum]) -> &EGLint {
unsafe {
&*(slice.as_ptr() as *const EGLint)
}
}
macro_rules! attributes {
($( $key: expr => $value: expr, )*) => {
cast_attributes(&[
$( $key, $value, )*
NONE,
])
}
}
impl SharedEglThings {
pub unsafe fn new(d3d_device: *mut ID3D11Device) -> Rc<Self> {
let device = eglCreateDeviceANGLE(
D3D11_DEVICE_ANGLE,
d3d_device as *mut c_void,
ptr::null(),
).check();
let display = GetPlatformDisplayEXT(
PLATFORM_DEVICE_EXT,
device,
attributes! [
EXPERIMENTAL_PRESENT_PATH_ANGLE => EXPERIMENTAL_PRESENT_PATH_FAST_ANGLE,
],
).check();
Initialize(display, ptr::null_mut(), ptr::null_mut()).check();
// Adapted from
// https://searchfox.org/mozilla-central/rev/056a4057/gfx/gl/GLContextProviderEGL.cpp#635
let mut configs = [ptr::null(); 64];
let mut num_configs = 0;
ChooseConfig(
display,
attributes! [
SURFACE_TYPE => WINDOW_BIT,
RENDERABLE_TYPE => OPENGL_ES2_BIT,
RED_SIZE => 8,
GREEN_SIZE => 8,
BLUE_SIZE => 8,
ALPHA_SIZE => 8,
],
configs.as_mut_ptr(),
configs.len() as i32,
&mut num_configs,
).check();
let config = pick_config(&configs[..num_configs as usize]);
let context = CreateContext(
display, config, NO_CONTEXT,
attributes![
CONTEXT_CLIENT_VERSION => 3,
]
).check();
MakeCurrent(display, NO_SURFACE, NO_SURFACE, context).check();
Rc::new(SharedEglThings { device, display, config, context })
}
}
fn pick_config(configs: &[types::EGLConfig]) -> types::EGLConfig {
// FIXME: better criteria to make this choice?
// Firefox uses GetConfigAttrib to find a config that has the requested r/g/b/a sizes
// https://searchfox.org/mozilla-central/rev/056a4057/gfx/gl/GLContextProviderEGL.cpp#662-685
configs[0]
}
impl Drop for SharedEglThings {
fn drop(&mut self) {
unsafe {
// FIXME does EGLDisplay or EGLConfig need clean up? How?
DestroyContext(self.display, self.context).check();
eglReleaseDeviceANGLE(self.device).check();
}
}
}
pub struct PerVisualEglThings {
shared: Rc<SharedEglThings>,
surface: types::EGLSurface,
}
impl PerVisualEglThings {
pub unsafe fn new(shared: Rc<SharedEglThings>, buffer: *const ID3D11Texture2D,
width: u32, height: u32)
-> Self {
let surface = CreatePbufferFromClientBuffer(
shared.display,
D3D_TEXTURE_ANGLE,
buffer as types::EGLClientBuffer,
shared.config,
attributes! [
WIDTH => width,
HEIGHT => height,
FLEXIBLE_SURFACE_COMPATIBILITY_SUPPORTED_ANGLE => TRUE,
],
).check();
PerVisualEglThings { shared, surface }
}
pub fn make_current(&self) {
unsafe {
MakeCurrent(self.shared.display, self.surface, self.surface, self.shared.context).check();
}
}
}
impl Drop for PerVisualEglThings {
fn drop(&mut self) {
unsafe {
DestroySurface(self.shared.display, self.surface).check();
}
}
}
fn check_error() {
unsafe {
let error = GetError() as types::EGLenum;
assert_eq!(error, SUCCESS, "0x{:x} != 0x{:x}", error, SUCCESS);
}
}
trait Check {
fn check(self) -> Self;
}
impl Check for *const c_void {
fn check(self) -> Self {
check_error();
assert!(!self.is_null());
self
}
}
impl Check for *mut c_void {
fn check(self) -> Self {
check_error();
assert!(!self.is_null());
self
}
}
impl Check for types::EGLBoolean {
fn check(self) -> Self {
check_error();
assert_eq!(self, TRUE);
self
}
}
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