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Quelle egl.rs
Sprache: unbekannt
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use glow::HasContext;
use once_cell::sync::Lazy;
use parking_lot::{MappedMutexGuard, Mutex, MutexGuard, RwLock};
use std::{
collections::HashMap, ffi, mem::ManuallyDrop, os::raw, ptr, rc::Rc, sync::Arc, time::Duration,
};
/// The amount of time to wait while trying to obtain a lock to the adapter context
const CONTEXT_LOCK_TIMEOUT_SECS: u64 = 1;
const EGL_CONTEXT_FLAGS_KHR: i32 = 0x30FC;
const EGL_CONTEXT_OPENGL_DEBUG_BIT_KHR: i32 = 0x0001;
const EGL_CONTEXT_OPENGL_ROBUST_ACCESS_EXT: i32 = 0x30BF;
const EGL_PLATFORM_WAYLAND_KHR: u32 = 0x31D8;
const EGL_PLATFORM_X11_KHR: u32 = 0x31D5;
const EGL_PLATFORM_ANGLE_ANGLE: u32 = 0x3202;
const EGL_PLATFORM_ANGLE_NATIVE_PLATFORM_TYPE_ANGLE: u32 = 0x348F;
const EGL_PLATFORM_ANGLE_DEBUG_LAYERS_ENABLED: u32 = 0x3451;
const EGL_PLATFORM_SURFACELESS_MESA: u32 = 0x31DD;
const EGL_GL_COLORSPACE_KHR: u32 = 0x309D;
const EGL_GL_COLORSPACE_SRGB_KHR: u32 = 0x3089;
type XOpenDisplayFun =
unsafe extern "system" fn(display_name: *const raw::c_char) -> *mut raw::c_void;
type XCloseDisplayFun = unsafe extern "system" fn(display: *mut raw::c_void) -> raw::c_int;
type WlDisplayConnectFun =
unsafe extern "system" fn(display_name: *const raw::c_char) -> *mut raw::c_void;
type WlDisplayDisconnectFun = unsafe extern "system" fn(display: *const raw::c_void);
#[cfg(not(Emscripten))]
type EglInstance = khronos_egl::DynamicInstance<khronos_egl::EGL1_4>;
#[cfg(Emscripten)]
type EglInstance = khronos_egl::Instance<khronos_egl::Static>;
type WlEglWindowCreateFun = unsafe extern "system" fn(
surface: *const raw::c_void,
width: raw::c_int,
height: raw::c_int,
) -> *mut raw::c_void;
type WlEglWindowResizeFun = unsafe extern "system" fn(
window: *const raw::c_void,
width: raw::c_int,
height: raw::c_int,
dx: raw::c_int,
dy: raw::c_int,
);
type WlEglWindowDestroyFun = unsafe extern "system" fn(window: *const raw::c_void);
type EglLabel = *const raw::c_void;
#[allow(clippy::upper_case_acronyms)]
type EGLDEBUGPROCKHR = Option<
unsafe extern "system" fn(
error: khronos_egl::Enum,
command: *const raw::c_char,
message_type: u32,
thread_label: EglLabel,
object_label: EglLabel,
message: *const raw::c_char,
),
>;
const EGL_DEBUG_MSG_CRITICAL_KHR: u32 = 0x33B9;
const EGL_DEBUG_MSG_ERROR_KHR: u32 = 0x33BA;
const EGL_DEBUG_MSG_WARN_KHR: u32 = 0x33BB;
const EGL_DEBUG_MSG_INFO_KHR: u32 = 0x33BC;
type EglDebugMessageControlFun = unsafe extern "system" fn(
proc: EGLDEBUGPROCKHR,
attrib_list: *const khronos_egl::Attrib,
) -> raw::c_int;
unsafe extern "system" fn egl_debug_proc(
error: khronos_egl::Enum,
command_raw: *const raw::c_char,
message_type: u32,
_thread_label: EglLabel,
_object_label: EglLabel,
message_raw: *const raw::c_char,
) {
let log_severity = match message_type {
EGL_DEBUG_MSG_CRITICAL_KHR | EGL_DEBUG_MSG_ERROR_KHR => log::Level::Error,
EGL_DEBUG_MSG_WARN_KHR => log::Level::Warn,
EGL_DEBUG_MSG_INFO_KHR => log::Level::Info,
_ => log::Level::Debug,
};
let command = unsafe { ffi::CStr::from_ptr(command_raw) }.to_string_lossy();
let message = if message_raw.is_null() {
"".into()
} else {
unsafe { ffi::CStr::from_ptr(message_raw) }.to_string_lossy()
};
log::log!(
log_severity,
"EGL '{}' code 0x{:x}: {}",
command,
error,
message,
);
}
/// A simple wrapper around an X11 or Wayland display handle.
/// Since the logic in this file doesn't actually need to directly
/// persist a wayland connection handle, the only load-bearing
/// enum variant is the X11 variant
#[derive(Debug)]
enum DisplayRef {
X11(ptr::NonNull<raw::c_void>),
Wayland,
}
impl DisplayRef {
/// Convenience for getting the underlying pointer
fn as_ptr(&self) -> *mut raw::c_void {
match *self {
Self::X11(ptr) => ptr.as_ptr(),
Self::Wayland => unreachable!(),
}
}
}
/// DisplayOwner ties the lifetime of the system display handle
/// to that of the loaded library.
/// It implements Drop to ensure that the display handle is closed
/// prior to unloading the library so that we don't leak the
/// associated file descriptors
#[derive(Debug)]
struct DisplayOwner {
library: libloading::Library,
display: DisplayRef,
}
impl Drop for DisplayOwner {
fn drop(&mut self) {
match self.display {
DisplayRef::X11(ptr) => unsafe {
let func: libloading::Symbol<XCloseDisplayFun> =
self.library.get(b"XCloseDisplay\0").unwrap();
func(ptr.as_ptr());
},
DisplayRef::Wayland => {}
}
}
}
fn open_x_display() -> Option<DisplayOwner> {
log::debug!("Loading X11 library to get the current display");
unsafe {
let library = find_library(&["libX11.so.6", "libX11.so"])?;
let func: libloading::Symbol<XOpenDisplayFun> = library.get(b"XOpenDisplay\0").unwrap();
let result = func(ptr::null());
ptr::NonNull::new(result).map(|ptr| DisplayOwner {
display: DisplayRef::X11(ptr),
library,
})
}
}
unsafe fn find_library(paths: &[&str]) -> Option<libloading::Library> {
for path in paths {
match unsafe { libloading::Library::new(path) } {
Ok(lib) => return Some(lib),
_ => continue,
};
}
None
}
fn test_wayland_display() -> Option<DisplayOwner> {
/* We try to connect and disconnect here to simply ensure there
* is an active wayland display available.
*/
log::debug!("Loading Wayland library to get the current display");
let library = unsafe {
let client_library = find_library(&["libwayland-client.so.0", "libwayland-client.so"])?;
let wl_display_connect: libloading::Symbol<WlDisplayConnectFun> =
client_library.get(b"wl_display_connect\0").unwrap();
let wl_display_disconnect: libloading::Symbol<WlDisplayDisconnectFun> =
client_library.get(b"wl_display_disconnect\0").unwrap();
let display = ptr::NonNull::new(wl_display_connect(ptr::null()))?;
wl_display_disconnect(display.as_ptr());
find_library(&["libwayland-egl.so.1", "libwayland-egl.so"])?
};
Some(DisplayOwner {
library,
display: DisplayRef::Wayland,
})
}
#[derive(Clone, Copy, Debug)]
enum SrgbFrameBufferKind {
/// No support for SRGB surface
None,
/// Using EGL 1.5's support for colorspaces
Core,
/// Using EGL_KHR_gl_colorspace
Khr,
}
/// Choose GLES framebuffer configuration.
fn choose_config(
egl: &EglInstance,
display: khronos_egl::Display,
srgb_kind: SrgbFrameBufferKind,
) -> Result<(khronos_egl::Config, bool), crate::InstanceError> {
//TODO: EGL_SLOW_CONFIG
let tiers = [
(
"off-screen",
&[
khronos_egl::SURFACE_TYPE,
khronos_egl::PBUFFER_BIT,
khronos_egl::RENDERABLE_TYPE,
khronos_egl::OPENGL_ES2_BIT,
][..],
),
(
"presentation",
&[khronos_egl::SURFACE_TYPE, khronos_egl::WINDOW_BIT][..],
),
#[cfg(not(target_os = "android"))]
(
"native-render",
&[khronos_egl::NATIVE_RENDERABLE, khronos_egl::TRUE as _][..],
),
];
let mut attributes = Vec::with_capacity(9);
for tier_max in (0..tiers.len()).rev() {
let name = tiers[tier_max].0;
log::debug!("\tTrying {}", name);
attributes.clear();
for &(_, tier_attr) in tiers[..=tier_max].iter() {
attributes.extend_from_slice(tier_attr);
}
// make sure the Alpha is enough to support sRGB
match srgb_kind {
SrgbFrameBufferKind::None => {}
_ => {
attributes.push(khronos_egl::ALPHA_SIZE);
attributes.push(8);
}
}
attributes.push(khronos_egl::NONE);
match egl.choose_first_config(display, &attributes) {
Ok(Some(config)) => {
if tier_max == 1 {
//Note: this has been confirmed to malfunction on Intel+NV laptops,
// but also on Angle.
log::warn!("EGL says it can present to the window but not natively",);
}
// Android emulator can't natively present either.
let tier_threshold = if cfg!(target_os = "android") || cfg!(windows) {
1
} else {
2
};
return Ok((config, tier_max >= tier_threshold));
}
Ok(None) => {
log::warn!("No config found!");
}
Err(e) => {
log::error!("error in choose_first_config: {:?}", e);
}
}
}
// TODO: include diagnostic details that are currently logged
Err(crate::InstanceError::new(String::from(
"unable to find an acceptable EGL framebuffer configuration",
)))
}
#[derive(Clone, Debug)]
struct EglContext {
instance: Arc<EglInstance>,
version: (i32, i32),
display: khronos_egl::Display,
raw: khronos_egl::Context,
pbuffer: Option<khronos_egl::Surface>,
}
impl EglContext {
fn make_current(&self) {
self.instance
.make_current(self.display, self.pbuffer, self.pbuffer, Some(self.raw))
.unwrap();
}
fn unmake_current(&self) {
self.instance
.make_current(self.display, None, None, None)
.unwrap();
}
}
/// A wrapper around a [`glow::Context`] and the required EGL context that uses locking to guarantee
/// exclusive access when shared with multiple threads.
pub struct AdapterContext {
glow: Mutex<ManuallyDrop<glow::Context>>,
egl: Option<EglContext>,
}
unsafe impl Sync for AdapterContext {}
unsafe impl Send for AdapterContext {}
impl AdapterContext {
pub fn is_owned(&self) -> bool {
self.egl.is_some()
}
/// Returns the EGL instance.
///
/// This provides access to EGL functions and the ability to load GL and EGL extension functions.
pub fn egl_instance(&self) -> Option<&EglInstance> {
self.egl.as_ref().map(|egl| &*egl.instance)
}
/// Returns the EGLDisplay corresponding to the adapter context.
///
/// Returns [`None`] if the adapter was externally created.
pub fn raw_display(&self) -> Option<&khronos_egl::Display> {
self.egl.as_ref().map(|egl| &egl.display)
}
/// Returns the EGL version the adapter context was created with.
///
/// Returns [`None`] if the adapter was externally created.
pub fn egl_version(&self) -> Option<(i32, i32)> {
self.egl.as_ref().map(|egl| egl.version)
}
pub fn raw_context(&self) -> *mut raw::c_void {
match self.egl {
Some(ref egl) => egl.raw.as_ptr(),
None => ptr::null_mut(),
}
}
}
impl Drop for AdapterContext {
fn drop(&mut self) {
struct CurrentGuard<'a>(&'a EglContext);
impl Drop for CurrentGuard<'_> {
fn drop(&mut self) {
self.0.unmake_current();
}
}
// Context must be current when dropped. See safety docs on
// `glow::HasContext`.
//
// NOTE: This is only set to `None` by `Adapter::new_external` which
// requires the context to be current when anything that may be holding
// the `Arc<AdapterShared>` is dropped.
let _guard = self.egl.as_ref().map(|egl| {
egl.make_current();
CurrentGuard(egl)
});
let glow = self.glow.get_mut();
// SAFETY: Field not used after this.
unsafe { ManuallyDrop::drop(glow) };
}
}
struct EglContextLock<'a> {
instance: &'a Arc<EglInstance>,
display: khronos_egl::Display,
}
/// A guard containing a lock to an [`AdapterContext`], while the GL context is kept current.
pub struct AdapterContextLock<'a> {
glow: MutexGuard<'a, ManuallyDrop<glow::Context>>,
egl: Option<EglContextLock<'a>>,
}
impl<'a> std::ops::Deref for AdapterContextLock<'a> {
type Target = glow::Context;
fn deref(&self) -> &Self::Target {
&self.glow
}
}
impl<'a> Drop for AdapterContextLock<'a> {
fn drop(&mut self) {
if let Some(egl) = self.egl.take() {
egl.instance
.make_current(egl.display, None, None, None)
.unwrap();
}
}
}
impl AdapterContext {
/// Get's the [`glow::Context`] without waiting for a lock
///
/// # Safety
///
/// This should only be called when you have manually made sure that the current thread has made
/// the EGL context current and that no other thread also has the EGL context current.
/// Additionally, you must manually make the EGL context **not** current after you are done with
/// it, so that future calls to `lock()` will not fail.
///
/// > **Note:** Calling this function **will** still lock the [`glow::Context`] which adds an
/// > extra safe-guard against accidental concurrent access to the context.
pub unsafe fn get_without_egl_lock(&self) -> MappedMutexGuard<glow::Context> {
let guard = self
.glow
.try_lock_for(Duration::from_secs(CONTEXT_LOCK_TIMEOUT_SECS))
.expect("Could not lock adapter context. This is most-likely a deadlock.");
MutexGuard::map(guard, |glow| &mut **glow)
}
/// Obtain a lock to the EGL context and get handle to the [`glow::Context`] that can be used to
/// do rendering.
#[track_caller]
pub fn lock<'a>(&'a self) -> AdapterContextLock<'a> {
let glow = self
.glow
// Don't lock forever. If it takes longer than 1 second to get the lock we've got a
// deadlock and should panic to show where we got stuck
.try_lock_for(Duration::from_secs(CONTEXT_LOCK_TIMEOUT_SECS))
.expect("Could not lock adapter context. This is most-likely a deadlock.");
let egl = self.egl.as_ref().map(|egl| {
egl.make_current();
EglContextLock {
instance: &egl.instance,
display: egl.display,
}
});
AdapterContextLock { glow, egl }
}
}
#[derive(Debug)]
struct Inner {
/// Note: the context contains a dummy pbuffer (1x1).
/// Required for `eglMakeCurrent` on platforms that doesn't supports `EGL_KHR_surfaceless_context`.
egl: EglContext,
#[allow(unused)]
version: (i32, i32),
supports_native_window: bool,
config: khronos_egl::Config,
#[cfg_attr(Emscripten, allow(dead_code))]
wl_display: Option<*mut raw::c_void>,
#[cfg_attr(Emscripten, allow(dead_code))]
force_gles_minor_version: wgt::Gles3MinorVersion,
/// Method by which the framebuffer should support srgb
srgb_kind: SrgbFrameBufferKind,
}
// Different calls to `eglGetPlatformDisplay` may return the same `Display`, making it a global
// state of all our `EglContext`s. This forces us to track the number of such context to prevent
// terminating the display if it's currently used by another `EglContext`.
static DISPLAYS_REFERENCE_COUNT: Lazy<Mutex<HashMap<usize, usize>>> = Lazy::new(Default::default);
fn initialize_display(
egl: &EglInstance,
display: khronos_egl::Display,
) -> Result<(i32, i32), khronos_egl::Error> {
let mut guard = DISPLAYS_REFERENCE_COUNT.lock();
*guard.entry(display.as_ptr() as usize).or_default() += 1;
// We don't need to check the reference count here since according to the `eglInitialize`
// documentation, initializing an already initialized EGL display connection has no effect
// besides returning the version numbers.
egl.initialize(display)
}
fn terminate_display(
egl: &EglInstance,
display: khronos_egl::Display,
) -> Result<(), khronos_egl::Error> {
let key = &(display.as_ptr() as usize);
let mut guard = DISPLAYS_REFERENCE_COUNT.lock();
let count_ref = guard
.get_mut(key)
.expect("Attempted to decref a display before incref was called");
if *count_ref > 1 {
*count_ref -= 1;
Ok(())
} else {
guard.remove(key);
egl.terminate(display)
}
}
impl Inner {
fn create(
flags: wgt::InstanceFlags,
egl: Arc<EglInstance>,
display: khronos_egl::Display,
force_gles_minor_version: wgt::Gles3MinorVersion,
) -> Result<Self, crate::InstanceError> {
let version = initialize_display(&egl, display).map_err(|e| {
crate::InstanceError::with_source(
String::from("failed to initialize EGL display connection"),
e,
)
})?;
let vendor = egl
.query_string(Some(display), khronos_egl::VENDOR)
.unwrap();
let display_extensions = egl
.query_string(Some(display), khronos_egl::EXTENSIONS)
.unwrap()
.to_string_lossy();
log::debug!("Display vendor {:?}, version {:?}", vendor, version,);
log::debug!(
"Display extensions: {:#?}",
display_extensions.split_whitespace().collect::<Vec<_>>()
);
let srgb_kind = if version >= (1, 5) {
log::debug!("\tEGL surface: +srgb");
SrgbFrameBufferKind::Core
} else if display_extensions.contains("EGL_KHR_gl_colorspace") {
log::debug!("\tEGL surface: +srgb khr");
SrgbFrameBufferKind::Khr
} else {
log::warn!("\tEGL surface: -srgb");
SrgbFrameBufferKind::None
};
if log::max_level() >= log::LevelFilter::Trace {
log::trace!("Configurations:");
let config_count = egl.get_config_count(display).unwrap();
let mut configurations = Vec::with_capacity(config_count);
egl.get_configs(display, &mut configurations).unwrap();
for &config in configurations.iter() {
log::trace!("\tCONFORMANT=0x{:X}, RENDERABLE=0x{:X}, NATIVE_RENDERABLE=0x{:X}, SURFACE_TYPE=0x{:X}, ALPHA_SIZE={}",
egl.get_config_attrib(display, config, khronos_egl::CONFORMANT).unwrap(),
egl.get_config_attrib(display, config, khronos_egl::RENDERABLE_TYPE).unwrap(),
egl.get_config_attrib(display, config, khronos_egl::NATIVE_RENDERABLE).unwrap(),
egl.get_config_attrib(display, config, khronos_egl::SURFACE_TYPE).unwrap(),
egl.get_config_attrib(display, config, khronos_egl::ALPHA_SIZE).unwrap(),
);
}
}
let (config, supports_native_window) = choose_config(&egl, display, srgb_kind)?;
let supports_opengl = if version >= (1, 4) {
let client_apis = egl
.query_string(Some(display), khronos_egl::CLIENT_APIS)
.unwrap()
.to_string_lossy();
client_apis
.split(' ')
.any(|client_api| client_api == "OpenGL")
} else {
false
};
egl.bind_api(if supports_opengl {
khronos_egl::OPENGL_API
} else {
khronos_egl::OPENGL_ES_API
})
.unwrap();
let needs_robustness = true;
let mut khr_context_flags = 0;
let supports_khr_context = display_extensions.contains("EGL_KHR_create_context");
let mut context_attributes = vec![];
let mut gl_context_attributes = vec![];
let mut gles_context_attributes = vec![];
gl_context_attributes.push(khronos_egl::CONTEXT_MAJOR_VERSION);
gl_context_attributes.push(3);
gl_context_attributes.push(khronos_egl::CONTEXT_MINOR_VERSION);
gl_context_attributes.push(3);
if supports_opengl && force_gles_minor_version != wgt::Gles3MinorVersion::Automatic {
log::warn!("Ignoring specified GLES minor version as OpenGL is used");
}
gles_context_attributes.push(khronos_egl::CONTEXT_MAJOR_VERSION);
gles_context_attributes.push(3); // Request GLES 3.0 or higher
if force_gles_minor_version != wgt::Gles3MinorVersion::Automatic {
gles_context_attributes.push(khronos_egl::CONTEXT_MINOR_VERSION);
gles_context_attributes.push(match force_gles_minor_version {
wgt::Gles3MinorVersion::Automatic => unreachable!(),
wgt::Gles3MinorVersion::Version0 => 0,
wgt::Gles3MinorVersion::Version1 => 1,
wgt::Gles3MinorVersion::Version2 => 2,
});
}
if flags.contains(wgt::InstanceFlags::DEBUG) {
if version >= (1, 5) {
log::debug!("\tEGL context: +debug");
context_attributes.push(khronos_egl::CONTEXT_OPENGL_DEBUG);
context_attributes.push(khronos_egl::TRUE as _);
} else if supports_khr_context {
log::debug!("\tEGL context: +debug KHR");
khr_context_flags |= EGL_CONTEXT_OPENGL_DEBUG_BIT_KHR;
} else {
log::debug!("\tEGL context: -debug");
}
}
if needs_robustness {
//Note: the core version can fail if robustness is not supported
// (regardless of whether the extension is supported!).
// In fact, Angle does precisely that awful behavior, so we don't try it there.
if version >= (1, 5) && !display_extensions.contains("EGL_ANGLE_") {
log::debug!("\tEGL context: +robust access");
context_attributes.push(khronos_egl::CONTEXT_OPENGL_ROBUST_ACCESS);
context_attributes.push(khronos_egl::TRUE as _);
} else if display_extensions.contains("EGL_EXT_create_context_robustness") {
log::debug!("\tEGL context: +robust access EXT");
context_attributes.push(EGL_CONTEXT_OPENGL_ROBUST_ACCESS_EXT);
context_attributes.push(khronos_egl::TRUE as _);
} else {
//Note: we aren't trying `EGL_CONTEXT_OPENGL_ROBUST_ACCESS_BIT_KHR`
// because it's for desktop GL only, not GLES.
log::warn!("\tEGL context: -robust access");
}
}
if khr_context_flags != 0 {
context_attributes.push(EGL_CONTEXT_FLAGS_KHR);
context_attributes.push(khr_context_flags);
}
context_attributes.push(khronos_egl::NONE);
gl_context_attributes.extend(&context_attributes);
gles_context_attributes.extend(&context_attributes);
let context = if supports_opengl {
egl.create_context(display, config, None, &gl_context_attributes)
.or_else(|_| {
egl.bind_api(khronos_egl::OPENGL_ES_API).unwrap();
egl.create_context(display, config, None, &gles_context_attributes)
})
.map_err(|e| {
crate::InstanceError::with_source(
String::from("unable to create OpenGL or GLES 3.x context"),
e,
)
})
} else {
egl.create_context(display, config, None, &gles_context_attributes)
.map_err(|e| {
crate::InstanceError::with_source(
String::from("unable to create GLES 3.x context"),
e,
)
})
}?;
// Testing if context can be binded without surface
// and creating dummy pbuffer surface if not.
let pbuffer = if version >= (1, 5)
|| display_extensions.contains("EGL_KHR_surfaceless_context")
|| cfg!(Emscripten)
{
log::debug!("\tEGL context: +surfaceless");
None
} else {
let attributes = [
khronos_egl::WIDTH,
1,
khronos_egl::HEIGHT,
1,
khronos_egl::NONE,
];
egl.create_pbuffer_surface(display, config, &attributes)
.map(Some)
.map_err(|e| {
crate::InstanceError::with_source(
String::from("error in create_pbuffer_surface"),
e,
)
})?
};
Ok(Self {
egl: EglContext {
instance: egl,
display,
raw: context,
pbuffer,
version,
},
version,
supports_native_window,
config,
wl_display: None,
srgb_kind,
force_gles_minor_version,
})
}
}
impl Drop for Inner {
fn drop(&mut self) {
if let Err(e) = self
.egl
.instance
.destroy_context(self.egl.display, self.egl.raw)
{
log::warn!("Error in destroy_context: {:?}", e);
}
if let Err(e) = terminate_display(&self.egl.instance, self.egl.display) {
log::warn!("Error in terminate: {:?}", e);
}
}
}
#[derive(Clone, Copy, Debug, PartialEq)]
enum WindowKind {
Wayland,
X11,
AngleX11,
Unknown,
}
#[derive(Clone, Debug)]
struct WindowSystemInterface {
display_owner: Option<Rc<DisplayOwner>>,
kind: WindowKind,
}
pub struct Instance {
wsi: WindowSystemInterface,
flags: wgt::InstanceFlags,
inner: Mutex<Inner>,
}
impl Instance {
pub fn raw_display(&self) -> khronos_egl::Display {
self.inner
.try_lock()
.expect("Could not lock instance. This is most-likely a deadlock.")
.egl
.display
}
/// Returns the version of the EGL display.
pub fn egl_version(&self) -> (i32, i32) {
self.inner
.try_lock()
.expect("Could not lock instance. This is most-likely a deadlock.")
.version
}
pub fn egl_config(&self) -> khronos_egl::Config {
self.inner
.try_lock()
.expect("Could not lock instance. This is most-likely a deadlock.")
.config
}
}
unsafe impl Send for Instance {}
unsafe impl Sync for Instance {}
impl crate::Instance for Instance {
type A = super::Api;
unsafe fn init(desc: &crate::InstanceDescriptor) -> Result<Self, crate::InstanceError> {
profiling::scope!("Init OpenGL (EGL) Backend");
#[cfg(Emscripten)]
let egl_result: Result<EglInstance, khronos_egl::Error> =
Ok(khronos_egl::Instance::new(khronos_egl::Static));
#[cfg(not(Emscripten))]
let egl_result = if cfg!(windows) {
unsafe {
khronos_egl::DynamicInstance::<khronos_egl::EGL1_4>::load_required_from_filename(
"libEGL.dll",
)
}
} else if cfg!(target_vendor = "apple") {
unsafe {
khronos_egl::DynamicInstance::<khronos_egl::EGL1_4>::load_required_from_filename(
"libEGL.dylib",
)
}
} else {
unsafe { khronos_egl::DynamicInstance::<khronos_egl::EGL1_4>::load_required() }
};
let egl = match egl_result {
Ok(egl) => Arc::new(egl),
Err(e) => {
return Err(crate::InstanceError::with_source(
String::from("unable to open libEGL"),
e,
));
}
};
let client_extensions = egl.query_string(None, khronos_egl::EXTENSIONS);
let client_ext_str = match client_extensions {
Ok(ext) => ext.to_string_lossy().into_owned(),
Err(_) => String::new(),
};
log::debug!(
"Client extensions: {:#?}",
client_ext_str.split_whitespace().collect::<Vec<_>>()
);
let wayland_library = if client_ext_str.contains("EGL_EXT_platform_wayland") {
test_wayland_display()
} else {
None
};
let x11_display_library = if client_ext_str.contains("EGL_EXT_platform_x11") {
open_x_display()
} else {
None
};
let angle_x11_display_library = if client_ext_str.contains("EGL_ANGLE_platform_angle") {
open_x_display()
} else {
None
};
#[cfg(not(Emscripten))]
let egl1_5 = egl.upcast::<khronos_egl::EGL1_5>();
#[cfg(Emscripten)]
let egl1_5: Option<&Arc<EglInstance>> = Some(&egl);
let (display, display_owner, wsi_kind) =
if let (Some(library), Some(egl)) = (wayland_library, egl1_5) {
log::info!("Using Wayland platform");
let display_attributes = [khronos_egl::ATTRIB_NONE];
let display = unsafe {
egl.get_platform_display(
EGL_PLATFORM_WAYLAND_KHR,
khronos_egl::DEFAULT_DISPLAY,
&display_attributes,
)
}
.unwrap();
(display, Some(Rc::new(library)), WindowKind::Wayland)
} else if let (Some(display_owner), Some(egl)) = (x11_display_library, egl1_5) {
log::info!("Using X11 platform");
let display_attributes = [khronos_egl::ATTRIB_NONE];
let display = unsafe {
egl.get_platform_display(
EGL_PLATFORM_X11_KHR,
display_owner.display.as_ptr(),
&display_attributes,
)
}
.unwrap();
(display, Some(Rc::new(display_owner)), WindowKind::X11)
} else if let (Some(display_owner), Some(egl)) = (angle_x11_display_library, egl1_5) {
log::info!("Using Angle platform with X11");
let display_attributes = [
EGL_PLATFORM_ANGLE_NATIVE_PLATFORM_TYPE_ANGLE as khronos_egl::Attrib,
EGL_PLATFORM_X11_KHR as khronos_egl::Attrib,
EGL_PLATFORM_ANGLE_DEBUG_LAYERS_ENABLED as khronos_egl::Attrib,
usize::from(desc.flags.contains(wgt::InstanceFlags::VALIDATION)),
khronos_egl::ATTRIB_NONE,
];
let display = unsafe {
egl.get_platform_display(
EGL_PLATFORM_ANGLE_ANGLE,
display_owner.display.as_ptr(),
&display_attributes,
)
}
.unwrap();
(display, Some(Rc::new(display_owner)), WindowKind::AngleX11)
} else if client_ext_str.contains("EGL_MESA_platform_surfaceless") {
log::warn!("No windowing system present. Using surfaceless platform");
#[allow(clippy::unnecessary_literal_unwrap)] // This is only a literal on Emscripten
let egl = egl1_5.expect("Failed to get EGL 1.5 for surfaceless");
let display = unsafe {
egl.get_platform_display(
EGL_PLATFORM_SURFACELESS_MESA,
khronos_egl::DEFAULT_DISPLAY,
&[khronos_egl::ATTRIB_NONE],
)
}
.unwrap();
(display, None, WindowKind::Unknown)
} else {
log::warn!("EGL_MESA_platform_surfaceless not available. Using default platform");
let display = unsafe { egl.get_display(khronos_egl::DEFAULT_DISPLAY) }.unwrap();
(display, None, WindowKind::Unknown)
};
if desc.flags.contains(wgt::InstanceFlags::VALIDATION)
&& client_ext_str.contains("EGL_KHR_debug")
{
log::debug!("Enabling EGL debug output");
let function: EglDebugMessageControlFun = {
let addr = egl.get_proc_address("eglDebugMessageControlKHR").unwrap();
unsafe { std::mem::transmute(addr) }
};
let attributes = [
EGL_DEBUG_MSG_CRITICAL_KHR as khronos_egl::Attrib,
1,
EGL_DEBUG_MSG_ERROR_KHR as khronos_egl::Attrib,
1,
EGL_DEBUG_MSG_WARN_KHR as khronos_egl::Attrib,
1,
EGL_DEBUG_MSG_INFO_KHR as khronos_egl::Attrib,
1,
khronos_egl::ATTRIB_NONE,
];
unsafe { (function)(Some(egl_debug_proc), attributes.as_ptr()) };
}
let inner = Inner::create(desc.flags, egl, display, desc.gles_minor_version)?;
Ok(Instance {
wsi: WindowSystemInterface {
display_owner,
kind: wsi_kind,
},
flags: desc.flags,
inner: Mutex::new(inner),
})
}
#[cfg_attr(target_os = "macos", allow(unused, unused_mut, unreachable_code))]
unsafe fn create_surface(
&self,
display_handle: raw_window_handle::RawDisplayHandle,
window_handle: raw_window_handle::RawWindowHandle,
) -> Result<Surface, crate::InstanceError> {
use raw_window_handle::RawWindowHandle as Rwh;
#[cfg_attr(any(target_os = "android", Emscripten), allow(unused_mut))]
let mut inner = self.inner.lock();
match (window_handle, display_handle) {
(Rwh::Xlib(_), _) => {}
(Rwh::Xcb(_), _) => {}
(Rwh::Win32(_), _) => {}
(Rwh::AppKit(_), _) => {}
#[cfg(target_os = "android")]
(Rwh::AndroidNdk(handle), _) => {
let format = inner
.egl
.instance
.get_config_attrib(
inner.egl.display,
inner.config,
khronos_egl::NATIVE_VISUAL_ID,
)
.unwrap();
let ret = unsafe {
ndk_sys::ANativeWindow_setBuffersGeometry(
handle
.a_native_window
.as_ptr()
.cast::<ndk_sys::ANativeWindow>(),
0,
0,
format,
)
};
if ret != 0 {
return Err(crate::InstanceError::new(format!(
"error {ret} returned from ANativeWindow_setBuffersGeometry",
)));
}
}
#[cfg(not(Emscripten))]
(Rwh::Wayland(_), raw_window_handle::RawDisplayHandle::Wayland(display_handle)) => {
if inner
.wl_display
.map(|ptr| ptr != display_handle.display.as_ptr())
.unwrap_or(true)
{
/* Wayland displays are not sharable between surfaces so if the
* surface we receive from this handle is from a different
* display, we must re-initialize the context.
*
* See gfx-rs/gfx#3545
*/
log::warn!("Re-initializing Gles context due to Wayland window");
use std::ops::DerefMut;
let display_attributes = [khronos_egl::ATTRIB_NONE];
let display = unsafe {
inner
.egl
.instance
.upcast::<khronos_egl::EGL1_5>()
.unwrap()
.get_platform_display(
EGL_PLATFORM_WAYLAND_KHR,
display_handle.display.as_ptr(),
&display_attributes,
)
}
.unwrap();
let new_inner = Inner::create(
self.flags,
Arc::clone(&inner.egl.instance),
display,
inner.force_gles_minor_version,
)?;
let old_inner = std::mem::replace(inner.deref_mut(), new_inner);
inner.wl_display = Some(display_handle.display.as_ptr());
drop(old_inner);
}
}
#[cfg(Emscripten)]
(Rwh::Web(_), _) => {}
other => {
return Err(crate::InstanceError::new(format!(
"unsupported window: {other:?}"
)));
}
};
inner.egl.unmake_current();
Ok(Surface {
egl: inner.egl.clone(),
wsi: self.wsi.clone(),
config: inner.config,
presentable: inner.supports_native_window,
raw_window_handle: window_handle,
swapchain: RwLock::new(None),
srgb_kind: inner.srgb_kind,
})
}
unsafe fn enumerate_adapters(
&self,
_surface_hint: Option<&Surface>,
) -> Vec<crate::ExposedAdapter<super::Api>> {
let inner = self.inner.lock();
inner.egl.make_current();
let mut gl = unsafe {
glow::Context::from_loader_function(|name| {
inner
.egl
.instance
.get_proc_address(name)
.map_or(ptr::null(), |p| p as *const _)
})
};
// In contrast to OpenGL ES, OpenGL requires explicitly enabling sRGB conversions,
// as otherwise the user has to do the sRGB conversion.
if !matches!(inner.srgb_kind, SrgbFrameBufferKind::None) {
unsafe { gl.enable(glow::FRAMEBUFFER_SRGB) };
}
if self.flags.contains(wgt::InstanceFlags::DEBUG) && gl.supports_debug() {
log::debug!("Max label length: {}", unsafe {
gl.get_parameter_i32(glow::MAX_LABEL_LENGTH)
});
}
if self.flags.contains(wgt::InstanceFlags::VALIDATION) && gl.supports_debug() {
log::debug!("Enabling GLES debug output");
unsafe { gl.enable(glow::DEBUG_OUTPUT) };
unsafe { gl.debug_message_callback(super::gl_debug_message_callback) };
}
// Wrap in ManuallyDrop to make it easier to "current" the GL context before dropping this
// GLOW context, which could also happen if a panic occurs after we uncurrent the context
// below but before AdapterContext is constructed.
let gl = ManuallyDrop::new(gl);
inner.egl.unmake_current();
unsafe {
super::Adapter::expose(AdapterContext {
glow: Mutex::new(gl),
egl: Some(inner.egl.clone()),
})
}
.into_iter()
.collect()
}
}
impl super::Adapter {
/// Creates a new external adapter using the specified loader function.
///
/// # Safety
///
/// - The underlying OpenGL ES context must be current.
/// - The underlying OpenGL ES context must be current when interfacing with any objects returned by
/// wgpu-hal from this adapter.
/// - The underlying OpenGL ES context must be current when dropping this adapter and when
/// dropping any objects returned from this adapter.
pub unsafe fn new_external(
fun: impl FnMut(&str) -> *const ffi::c_void,
) -> Option<crate::ExposedAdapter<super::Api>> {
let context = unsafe { glow::Context::from_loader_function(fun) };
unsafe {
Self::expose(AdapterContext {
glow: Mutex::new(ManuallyDrop::new(context)),
egl: None,
})
}
}
pub fn adapter_context(&self) -> &AdapterContext {
&self.shared.context
}
}
impl super::Device {
/// Returns the underlying EGL context.
pub fn context(&self) -> &AdapterContext {
&self.shared.context
}
}
#[derive(Debug)]
pub struct Swapchain {
surface: khronos_egl::Surface,
wl_window: Option<*mut raw::c_void>,
framebuffer: glow::Framebuffer,
renderbuffer: glow::Renderbuffer,
/// Extent because the window lies
extent: wgt::Extent3d,
format: wgt::TextureFormat,
format_desc: super::TextureFormatDesc,
#[allow(unused)]
sample_type: wgt::TextureSampleType,
}
#[derive(Debug)]
pub struct Surface {
egl: EglContext,
wsi: WindowSystemInterface,
config: khronos_egl::Config,
pub(super) presentable: bool,
raw_window_handle: raw_window_handle::RawWindowHandle,
swapchain: RwLock<Option<Swapchain>>,
srgb_kind: SrgbFrameBufferKind,
}
unsafe impl Send for Surface {}
unsafe impl Sync for Surface {}
impl Surface {
pub(super) unsafe fn present(
&self,
_suf_texture: super::Texture,
context: &AdapterContext,
) -> Result<(), crate::SurfaceError> {
let gl = unsafe { context.get_without_egl_lock() };
let swapchain = self.swapchain.read();
let sc = swapchain.as_ref().unwrap();
self.egl
.instance
.make_current(
self.egl.display,
Some(sc.surface),
Some(sc.surface),
Some(self.egl.raw),
)
.map_err(|e| {
log::error!("make_current(surface) failed: {}", e);
crate::SurfaceError::Lost
})?;
unsafe { gl.disable(glow::SCISSOR_TEST) };
unsafe { gl.color_mask(true, true, true, true) };
unsafe { gl.bind_framebuffer(glow::DRAW_FRAMEBUFFER, None) };
unsafe { gl.bind_framebuffer(glow::READ_FRAMEBUFFER, Some(sc.framebuffer)) };
if !matches!(self.srgb_kind, SrgbFrameBufferKind::None) {
// Disable sRGB conversions for `glBlitFramebuffer` as behavior does diverge between
// drivers and formats otherwise and we want to ensure no sRGB conversions happen.
unsafe { gl.disable(glow::FRAMEBUFFER_SRGB) };
}
// Note the Y-flipping here. GL's presentation is not flipped,
// but main rendering is. Therefore, we Y-flip the output positions
// in the shader, and also this blit.
unsafe {
gl.blit_framebuffer(
0,
sc.extent.height as i32,
sc.extent.width as i32,
0,
0,
0,
sc.extent.width as i32,
sc.extent.height as i32,
glow::COLOR_BUFFER_BIT,
glow::NEAREST,
)
};
if !matches!(self.srgb_kind, SrgbFrameBufferKind::None) {
unsafe { gl.enable(glow::FRAMEBUFFER_SRGB) };
}
unsafe { gl.bind_framebuffer(glow::READ_FRAMEBUFFER, None) };
self.egl
.instance
.swap_buffers(self.egl.display, sc.surface)
.map_err(|e| {
log::error!("swap_buffers failed: {}", e);
crate::SurfaceError::Lost
// TODO: should we unset the current context here?
})?;
self.egl
.instance
.make_current(self.egl.display, None, None, None)
.map_err(|e| {
log::error!("make_current(null) failed: {}", e);
crate::SurfaceError::Lost
})?;
Ok(())
}
unsafe fn unconfigure_impl(
&self,
device: &super::Device,
) -> Option<(khronos_egl::Surface, Option<*mut raw::c_void>)> {
let gl = &device.shared.context.lock();
match self.swapchain.write().take() {
Some(sc) => {
unsafe { gl.delete_renderbuffer(sc.renderbuffer) };
unsafe { gl.delete_framebuffer(sc.framebuffer) };
Some((sc.surface, sc.wl_window))
}
None => None,
}
}
pub fn supports_srgb(&self) -> bool {
match self.srgb_kind {
SrgbFrameBufferKind::None => false,
_ => true,
}
}
}
impl crate::Surface for Surface {
type A = super::Api;
unsafe fn configure(
&self,
device: &super::Device,
config: &crate::SurfaceConfiguration,
) -> Result<(), crate::SurfaceError> {
use raw_window_handle::RawWindowHandle as Rwh;
let (surface, wl_window) = match unsafe { self.unconfigure_impl(device) } {
Some(pair) => pair,
None => {
let mut wl_window = None;
let (mut temp_xlib_handle, mut temp_xcb_handle);
let native_window_ptr = match (self.wsi.kind, self.raw_window_handle) {
(WindowKind::Unknown | WindowKind::X11, Rwh::Xlib(handle)) => {
temp_xlib_handle = handle.window;
ptr::from_mut(&mut temp_xlib_handle).cast::<ffi::c_void>()
}
(WindowKind::AngleX11, Rwh::Xlib(handle)) => handle.window as *mut ffi::c_void,
(WindowKind::Unknown | WindowKind::X11, Rwh::Xcb(handle)) => {
temp_xcb_handle = handle.window;
ptr::from_mut(&mut temp_xcb_handle).cast::<ffi::c_void>()
}
(WindowKind::AngleX11, Rwh::Xcb(handle)) => {
handle.window.get() as *mut ffi::c_void
}
(WindowKind::Unknown, Rwh::AndroidNdk(handle)) => {
handle.a_native_window.as_ptr()
}
(WindowKind::Wayland, Rwh::Wayland(handle)) => {
let library = &self.wsi.display_owner.as_ref().unwrap().library;
let wl_egl_window_create: libloading::Symbol<WlEglWindowCreateFun> =
unsafe { library.get(b"wl_egl_window_create\0") }.unwrap();
let window =
unsafe { wl_egl_window_create(handle.surface.as_ptr(), 640, 480) }
.cast();
wl_window = Some(window);
window
}
#[cfg(Emscripten)]
(WindowKind::Unknown, Rwh::Web(handle)) => handle.id as *mut ffi::c_void,
(WindowKind::Unknown, Rwh::Win32(handle)) => {
handle.hwnd.get() as *mut ffi::c_void
}
(WindowKind::Unknown, Rwh::AppKit(handle)) => {
#[cfg(not(target_os = "macos"))]
let window_ptr = handle.ns_view.as_ptr();
#[cfg(target_os = "macos")]
let window_ptr = {
use objc::{msg_send, runtime::Object, sel, sel_impl};
// ns_view always have a layer and don't need to verify that it exists.
let layer: *mut Object =
msg_send![handle.ns_view.as_ptr().cast::<Object>(), layer];
layer.cast::<ffi::c_void>()
};
window_ptr
}
_ => {
log::warn!(
"Initialized platform {:?} doesn't work with window {:?}",
self.wsi.kind,
self.raw_window_handle
);
return Err(crate::SurfaceError::Other("incompatible window kind"));
}
};
let mut attributes = vec![
khronos_egl::RENDER_BUFFER,
// We don't want any of the buffering done by the driver, because we
// manage a swapchain on our side.
// Some drivers just fail on surface creation seeing `EGL_SINGLE_BUFFER`.
if cfg!(any(target_os = "android", target_os = "macos"))
|| cfg!(windows)
|| self.wsi.kind == WindowKind::AngleX11
{
khronos_egl::BACK_BUFFER
} else {
khronos_egl::SINGLE_BUFFER
},
];
if config.format.is_srgb() {
match self.srgb_kind {
SrgbFrameBufferKind::None => {}
SrgbFrameBufferKind::Core => {
attributes.push(khronos_egl::GL_COLORSPACE);
attributes.push(khronos_egl::GL_COLORSPACE_SRGB);
}
SrgbFrameBufferKind::Khr => {
attributes.push(EGL_GL_COLORSPACE_KHR as i32);
attributes.push(EGL_GL_COLORSPACE_SRGB_KHR as i32);
}
}
}
attributes.push(khronos_egl::ATTRIB_NONE as i32);
#[cfg(not(Emscripten))]
let egl1_5 = self.egl.instance.upcast::<khronos_egl::EGL1_5>();
#[cfg(Emscripten)]
let egl1_5: Option<&Arc<EglInstance>> = Some(&self.egl.instance);
// Careful, we can still be in 1.4 version even if `upcast` succeeds
let raw_result = match egl1_5 {
Some(egl) if self.wsi.kind != WindowKind::Unknown => {
let attributes_usize = attributes
.into_iter()
.map(|v| v as usize)
.collect::<Vec<_>>();
unsafe {
egl.create_platform_window_surface(
self.egl.display,
self.config,
native_window_ptr,
&attributes_usize,
)
}
}
_ => unsafe {
self.egl.instance.create_window_surface(
self.egl.display,
self.config,
native_window_ptr,
Some(&attributes),
)
},
};
match raw_result {
Ok(raw) => (raw, wl_window),
Err(e) => {
log::warn!("Error in create_window_surface: {:?}", e);
return Err(crate::SurfaceError::Lost);
}
}
}
};
if let Some(window) = wl_window {
let library = &self.wsi.display_owner.as_ref().unwrap().library;
let wl_egl_window_resize: libloading::Symbol<WlEglWindowResizeFun> =
unsafe { library.get(b"wl_egl_window_resize\0") }.unwrap();
unsafe {
wl_egl_window_resize(
window,
config.extent.width as i32,
config.extent.height as i32,
0,
0,
)
};
}
let format_desc = device.shared.describe_texture_format(config.format);
let gl = &device.shared.context.lock();
let renderbuffer = unsafe { gl.create_renderbuffer() }.map_err(|error| {
log::error!("Internal swapchain renderbuffer creation failed: {error}");
crate::DeviceError::OutOfMemory
})?;
unsafe { gl.bind_renderbuffer(glow::RENDERBUFFER, Some(renderbuffer)) };
unsafe {
gl.renderbuffer_storage(
glow::RENDERBUFFER,
format_desc.internal,
config.extent.width as _,
config.extent.height as _,
)
};
let framebuffer = unsafe { gl.create_framebuffer() }.map_err(|error| {
log::error!("Internal swapchain framebuffer creation failed: {error}");
crate::DeviceError::OutOfMemory
})?;
unsafe { gl.bind_framebuffer(glow::READ_FRAMEBUFFER, Some(framebuffer)) };
unsafe {
gl.framebuffer_renderbuffer(
glow::READ_FRAMEBUFFER,
glow::COLOR_ATTACHMENT0,
glow::RENDERBUFFER,
Some(renderbuffer),
)
};
unsafe { gl.bind_renderbuffer(glow::RENDERBUFFER, None) };
unsafe { gl.bind_framebuffer(glow::READ_FRAMEBUFFER, None) };
let mut swapchain = self.swapchain.write();
*swapchain = Some(Swapchain {
surface,
wl_window,
renderbuffer,
framebuffer,
extent: config.extent,
format: config.format,
format_desc,
sample_type: wgt::TextureSampleType::Float { filterable: false },
});
Ok(())
}
unsafe fn unconfigure(&self, device: &super::Device) {
if let Some((surface, wl_window)) = unsafe { self.unconfigure_impl(device) } {
self.egl
.instance
.destroy_surface(self.egl.display, surface)
.unwrap();
if let Some(window) = wl_window {
let library = &self
.wsi
.display_owner
.as_ref()
.expect("unsupported window")
.library;
let wl_egl_window_destroy: libloading::Symbol<WlEglWindowDestroyFun> =
unsafe { library.get(b"wl_egl_window_destroy\0") }.unwrap();
unsafe { wl_egl_window_destroy(window) };
}
}
}
unsafe fn acquire_texture(
&self,
_timeout_ms: Option<Duration>, //TODO
_fence: &super::Fence,
) -> Result<Option<crate::AcquiredSurfaceTexture<super::Api>>, crate::SurfaceError> {
let swapchain = self.swapchain.read();
let sc = swapchain.as_ref().unwrap();
let texture = super::Texture {
inner: super::TextureInner::Renderbuffer {
raw: sc.renderbuffer,
},
drop_guard: None,
array_layer_count: 1,
mip_level_count: 1,
format: sc.format,
format_desc: sc.format_desc.clone(),
copy_size: crate::CopyExtent {
width: sc.extent.width,
height: sc.extent.height,
depth: 1,
},
};
Ok(Some(crate::AcquiredSurfaceTexture {
texture,
suboptimal: false,
}))
}
unsafe fn discard_texture(&self, _texture: super::Texture) {}
}
[ Dauer der Verarbeitung: 0.45 Sekunden
(vorverarbeitet)
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2026-04-02
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