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# Changelog
All notable changes to this project will be documented in this file.
The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
## [Unpublished]
## [4.1.0]
### Changed
- `load_required` and `load` now trying to load `libEGL.so.1` or `libEGL.so`.
## [4.0.0]
### Added
- `no-pkg-config` feature.
### Changed
- Upgrade dependency `libloading`: ^0.6 -> ^0.7.
### Removed
- `nightly` feature hich is no longer needed since `const_fn` is stabilized.
## [3.0.2]
### Changed
- One Linux, use the `RTLD_NODELETE` when loading the EGL library in `load_required_from_filename` and `load_from_filename`.
## [3.0.1]
### Changed
- Load `libEGL.so.1` by default instead of `libEGL.so`.
## [3.0.0]
### Changed
- Impl `Debug` for `Static`, `Dynamic` and `Instance`.
- Add a `DynamicInstance` type alias for `Instance<Dynamic<libloading::Library>>` with helper functions.
- Precise version selection.
- Dynamic cast between versions with `Dynamic::load`, `Dynamic::load_required` and the `Upcast`/`Downcast` traits.
- `DynamicInstance::downcast` and `IDynamicInstance::upcast`.
## [3.0.0-beta]
### Changed
- Removed the `khronos` dependency.
- Dynamic linking: Add the `Api` trait and the `Instance` struct along with the `static` and `dynamic` features.
- The dependency to `pkg-config` is now optional, only required by the `static` feature.
- Add an optional dependency to `libloading`, only required by the `dynamic` feature.
## [2.2.0]
### Added
- Fix #9: new function `get_config_count` to get the number of available frame buffer configurations.
## [2.1.1]
### Changed
- Upgrade dependency `gl`: ^0.11 -> ^0.14
- Upgrade dependency `wayland-client`: ^0.23 -> ^0.25
- Upgrade dependency `wayland-protocols`: ^0.23 -> ^0.25
- Upgrade dependency `wayland-egl`: ^0.23 -> ^0.25
## [2.1.0]
### Changed
- Fix #3: accept `Option<Display>` instead of `Display` in `query_string`.
- More flexible dependencies versions.

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Copyright [yyyy] [name of copyright owner]
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

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Permission is hereby granted, free of charge, to any
person obtaining a copy of this software and associated
documentation files (the "Software"), to deal in the
Software without restriction, including without
limitation the rights to use, copy, modify, merge,
publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software
is furnished to do so, subject to the following
conditions:
The above copyright notice and this permission notice
shall be included in all copies or substantial portions
of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.

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# Rust bindings for EGL
<table><tr>
<td><a href="https://docs.rs/khronos-egl">Documentation</a></td>
<td><a href="https://crates.io/crates/khronos-egl">Crate informations</a></td>
<td><a href="https://github.com/timothee-haudebourg/khronos-egl">Repository</a></td>
</tr></table>
This crate provides a binding for the Khronos EGL 1.5 API.
It was originally a fork of the [egl](https://crates.io/crates/egl) crate,
which is left unmaintained.
## Usage
You can access the EGL API using an [`Instance`](https://docs.rs/khronos-egl/latest/khronos-egl/struct.Instance.html)
object defined by either statically linking with `libEGL.so.1` at compile time,
or dynamically loading the EGL library at runtime.
### Static linking
You must enable static linking using the `static` feature in your `Cargo.toml`:
```toml
khronos-egl = { version = ..., features = ["static"] }
```
This will add a dependency to the [`pkg-config`](https://crates.io/crates/pkg-config) crate,
necessary to find the EGL library at compile time.
If you wish to disable linking EGL in this crate, and provide linking in
your crate instead, enable the `no-pkg-config` feature.
```toml
khronos-egl = {version = ..., features = ["static", "no-pkg-config"]}
```
Here is a simple example showing how to use this library to create an EGL context when static linking is enabled.
```rust
extern crate khronos_egl as egl;
fn main() -> Result<(), egl::Error> {
// Create an EGL API instance.
// The `egl::Static` API implementation is only available when the `static` feature is enabled.
let egl = egl::Instance::new(egl::Static);
let wayland_display = wayland_client::Display::connect_to_env().expect("unable to connect to the wayland server");
let display = egl.get_display(wayland_display.get_display_ptr() as *mut std::ffi::c_void).unwrap();
egl.initialize(display)?;
let attributes = [
egl::RED_SIZE, 8,
egl::GREEN_SIZE, 8,
egl::BLUE_SIZE, 8,
egl::NONE
];
let config = egl.choose_first_config(display, &attributes)?.expect("unable to find an appropriate ELG configuration");
let context_attributes = [
egl::CONTEXT_MAJOR_VERSION, 4,
egl::CONTEXT_MINOR_VERSION, 0,
egl::CONTEXT_OPENGL_PROFILE_MASK, egl::CONTEXT_OPENGL_CORE_PROFILE_BIT,
egl::NONE
];
egl.create_context(display, config, None, &context_attributes);
Ok(())
}
```
The creation of a `Display` instance is not detailed here since it depends on your display server.
It is created using the `get_display` function with a pointer to the display server connection handle.
For instance, if you are using the [wayland-client](https://crates.io/crates/wayland-client) crate,
you can get this pointer using the `Display::get_display_ptr` method.
#### Static API Instance
It may be bothering in some applications to pass the `Instance` to every fonction that needs to call the EGL API.
One workaround would be to define a static `Instance`,
which should be possible to define at compile time using static linking.
However this is not yet supported by the stable `rustc` compiler.
With the nightly compiler,
you can combine the `nightly` and `static` features so that this crate
can provide a static `Instance`, called `API` that can then be accessed everywhere.
```rust
use egl::API as egl;
```
### Dynamic Linking
Dynamic linking allows your application to accept multiple versions of EGL and be more flexible.
You must enable dynamic linking using the `dynamic` feature in your `Cargo.toml`:
```toml
khronos-egl = { version = ..., features = ["dynamic"] }
```
This will add a dependency to the [`libloading`](https://crates.io/crates/libloading) crate,
necessary to find the EGL library at runtime.
You can then load the EGL API into a `Instance<Dynamic<libloading::Library>>` as follows:
```rust
let lib = libloading::Library::new("libEGL.so.1").expect("unable to find libEGL.so.1");
let egl = unsafe { egl::DynamicInstance::<egl::EGL1_4>::load_required_from(lib).expect("unable to load libEGL.so.1") };
```
Here, `egl::EGL1_4` is used to specify what is the minimum required version of EGL that must be provided by `libEGL.so.1`.
This will return a `DynamicInstance<egl::EGL1_4>`, however in that case where `libEGL.so.1` provides a more recent version of EGL,
you can still upcast ths instance to provide version specific features:
```rust
match egl.upcast::<egl::EGL1_5>() {
Some(egl1_5) => {
// do something with EGL 1.5
}
None => {
// do something with EGL 1.4 instead.
}
};
```
### NixOS
A `shell.nix` file is present for nix users to build the crate easily.
Just enter a new nix shell using the given configuration file,
and `cargo build` should work.
If you want to run the tests and examples you will need to use `shell-wayland.nix` instead
that will also load wayland since most of them depend on it.
## Testing
Most test and examples most be compiled with the `static` feature.
## Troubleshooting
### Static Linking with OpenGL ES
When using OpenGL ES with `khronos-egl` with the `static` feature,
it is necessary to place a dummy extern at the top of your application which links libEGL first, then GLESv1/2.
This is because libEGL provides symbols required by GLESv1/2.
Here's how to work around this:
```rust
#[link(name = "EGL")]
#[link(name = "GLESv2")]
extern {}
```
## License
Licensed under either of
* Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
* MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
at your option.
If the original `egl` crate was licensed only under the Apache 2.0 license,
I believe I have made enough breaking changes so that no relevant code from the
original code remains and the rest can be relicensed.
### Contribution
Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any
additional terms or conditions.

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#[cfg(all(feature="static", not(feature="no-pkg-config")))]
extern crate pkg_config;
fn main() {
#[cfg(all(feature="static", not(feature="no-pkg-config")))]
{
pkg_config::Config::new()
.atleast_version("1")
.probe("egl")
.unwrap();
}
}

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extern crate gl;
extern crate khronos_egl as egl;
extern crate libloading;
use std::sync::Arc;
use egl::{
EGL1_2,
EGL1_4
};
fn main() {
let minimal_egl = unsafe { Arc::new(egl::DynamicInstance::load().expect("unable to load libEGL.so.1")) };
println!("EGL version is {}", minimal_egl.version());
// Select the rendering API.
if let Some(egl1_2) = minimal_egl.upcast::<EGL1_2>() {
println!("selecting API");
egl1_2.bind_api(egl::OPENGL_API).expect("unable to select OpenGL API");
}
// Setup Open GL.
gl::load_with(|name| minimal_egl.get_proc_address(name).unwrap() as *const std::ffi::c_void);
match minimal_egl.upcast::<EGL1_4>() {
Some(egl1_4) => {
foo_with_1_4(egl1_4)
},
None => {
foo_without_1_4(&minimal_egl)
}
}
}
fn foo_with_1_4<V: egl::api::EGL1_4>(_egl: &egl::Instance<V>) {
println!("with 1.4");
// do something that requires at least EGL 1.4.
}
fn foo_without_1_4<V>(_egl: &egl::Instance<V>) {
println!("without 1.4");
// do something without any specific EGL version (other that 1.0).
}

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extern crate gl;
extern crate khronos_egl as egl;
extern crate wayland_client;
extern crate wayland_egl;
extern crate wayland_protocols;
extern crate libloading;
use std::sync::Arc;
use std::sync::atomic::{AtomicBool, Ordering};
use std::ptr;
use std::ffi::CStr;
use gl::types::{GLint, GLuint, GLchar, GLenum, GLboolean, GLvoid};
use wayland_client::{
protocol::{wl_compositor::WlCompositor, wl_surface::WlSurface},
DispatchData, Display, EventQueue, Main
};
use wayland_protocols::xdg_shell::client::{
xdg_surface::{self, XdgSurface},
xdg_wm_base::{self, XdgWmBase},
};
fn process_xdg_event(xdg: Main<XdgWmBase>, event: xdg_wm_base::Event, _dd: DispatchData) {
use xdg_wm_base::Event::*;
match event {
Ping { serial } => xdg.pong(serial),
_ => (),
}
}
struct DisplayConnection {
display: Display,
event_queue: EventQueue,
compositor: Main<WlCompositor>,
xdg: Main<XdgWmBase>,
}
fn setup_wayland() -> DisplayConnection {
let display =
wayland_client::Display::connect_to_env().expect("unable to connect to the wayland server");
let mut event_queue = display.create_event_queue();
let attached_display = display.clone().attach(event_queue.token());
let globals = wayland_client::GlobalManager::new(&attached_display);
// Roundtrip to retrieve the globals list
event_queue
.sync_roundtrip(&mut (), |_, _, _| unreachable!())
.unwrap();
// Get the compositor.
let compositor: Main<WlCompositor> = globals.instantiate_exact(1).unwrap();
// Xdg protocol.
let xdg: Main<XdgWmBase> = globals.instantiate_exact(1).unwrap();
xdg.quick_assign(process_xdg_event);
DisplayConnection {
display,
event_queue,
compositor,
xdg,
}
}
fn setup_egl(egl: &egl::DynamicInstance, display: &Display) -> egl::Display {
let egl_display = egl.get_display(display.get_display_ptr() as *mut std::ffi::c_void).unwrap();
egl.initialize(egl_display).unwrap();
egl_display
}
fn create_context(egl: &egl::DynamicInstance, display: egl::Display) -> (egl::Context, egl::Config) {
let attributes = [
egl::RED_SIZE,
8,
egl::GREEN_SIZE,
8,
egl::BLUE_SIZE,
8,
egl::NONE,
];
let config = egl.choose_first_config(display, &attributes)
.expect("unable to choose an EGL configuration")
.expect("no EGL configuration found");
let context_attributes = [
egl::CONTEXT_MAJOR_VERSION,
4,
egl::CONTEXT_MINOR_VERSION,
0,
egl::CONTEXT_OPENGL_PROFILE_MASK,
egl::CONTEXT_OPENGL_CORE_PROFILE_BIT,
egl::NONE,
];
let context = egl.create_context(display, config, None, &context_attributes)
.expect("unable to create an EGL context");
(context, config)
}
struct Surface {
handle: Main<WlSurface>,
initialized: AtomicBool
}
fn create_surface(
egl: &Arc<egl::DynamicInstance>,
ctx: &DisplayConnection,
egl_display: egl::Display,
egl_context: egl::Context,
egl_config: egl::Config,
width: i32,
height: i32,
) -> Arc<Surface> {
let wl_surface = ctx.compositor.create_surface();
let xdg_surface = ctx.xdg.get_xdg_surface(&wl_surface);
let xdg_toplevel = xdg_surface.get_toplevel();
xdg_toplevel.set_app_id("khronos-egl-test".to_string());
xdg_toplevel.set_title("Test".to_string());
wl_surface.commit();
ctx.display.flush().unwrap();
let surface = Arc::new(Surface {
handle: wl_surface,
initialized: AtomicBool::new(false)
});
let weak_surface = Arc::downgrade(&surface);
let egl = egl.clone();
xdg_surface.quick_assign(move |xdg_surface: Main<XdgSurface>, event: xdg_surface::Event, _dd: DispatchData| {
use xdg_surface::Event::*;
match event {
Configure { serial } => {
if let Some(surface) = weak_surface.upgrade() {
if !surface.initialized.swap(true, Ordering::Relaxed) {
let wl_egl_surface = wayland_egl::WlEglSurface::new(&surface.handle, width, height);
let egl_surface = unsafe {
egl.create_window_surface(
egl_display,
egl_config,
wl_egl_surface.ptr() as egl::NativeWindowType,
None,
)
.expect("unable to create an EGL surface")
};
egl.make_current(egl_display, Some(egl_surface), Some(egl_surface), Some(egl_context))
.expect("unable to bind the context");
render();
egl.swap_buffers(egl_display, egl_surface)
.expect("unable to post the surface content");
xdg_surface.ack_configure(serial);
}
}
},
_ => (),
}
});
surface
}
fn main() {
let egl = unsafe { Arc::new(egl::DynamicInstance::<egl::EGL1_5>::load_required().expect("unable to load libEGL.so.1")) };
// Setup Open GL.
egl.bind_api(egl::OPENGL_API)
.expect("unable to select OpenGL API");
gl::load_with(|name| egl.get_proc_address(name).unwrap() as *const std::ffi::c_void);
// Setup the Wayland client.
let mut ctx = setup_wayland();
// Setup EGL.
let egl_display = setup_egl(&egl, &ctx.display);
let (egl_context, egl_config) = create_context(&egl, egl_display);
// Create a surface.
// Note that it must be kept alive to the end of execution.
let _surface = create_surface(&egl, &ctx, egl_display, egl_context, egl_config, 800, 600);
loop {
ctx.event_queue
.dispatch(&mut (), |_, _, _| { /* we ignore unfiltered messages */ })
.unwrap();
}
}
const VERTEX: &'static [GLint; 8] = &[
-1, -1,
1, -1,
1, 1,
-1, 1
];
const INDEXES: &'static [GLuint; 4] = &[
0, 1, 2, 3
];
const VERTEX_SHADER: &[u8] = b"#version 400
in vec2 position;
void main() {
gl_Position = vec4(position, 0.0f, 1.0f);
}
\0";
const FRAGMENT_SHADER: &[u8] = b"#version 400
out vec4 color;
void main() {
color = vec4(1.0f, 0.0f, 0.0f, 1.0f);
}
\0";
fn render() {
unsafe {
let vertex_shader = gl::CreateShader(gl::VERTEX_SHADER);
check_gl_errors();
let src = CStr::from_bytes_with_nul_unchecked(VERTEX_SHADER).as_ptr();
gl::ShaderSource(vertex_shader, 1, (&[src]).as_ptr(), ptr::null());
check_gl_errors();
gl::CompileShader(vertex_shader);
check_shader_status(vertex_shader);
let fragment_shader = gl::CreateShader(gl::FRAGMENT_SHADER);
check_gl_errors();
let src = CStr::from_bytes_with_nul_unchecked(FRAGMENT_SHADER).as_ptr();
gl::ShaderSource(fragment_shader, 1, (&[src]).as_ptr(), ptr::null());
check_gl_errors();
gl::CompileShader(fragment_shader);
check_shader_status(fragment_shader);
let program = gl::CreateProgram();
check_gl_errors();
gl::AttachShader(program, vertex_shader);
check_gl_errors();
gl::AttachShader(program, fragment_shader);
check_gl_errors();
gl::LinkProgram(program);
check_gl_errors();
gl::UseProgram(program);
check_gl_errors();
let mut buffer = 0;
gl::GenBuffers(1, &mut buffer);
check_gl_errors();
gl::BindBuffer(gl::ARRAY_BUFFER, buffer);
check_gl_errors();
gl::BufferData(
gl::ARRAY_BUFFER,
8 * 4,
VERTEX.as_ptr() as *const std::ffi::c_void,
gl::STATIC_DRAW
);
check_gl_errors();
let mut vertex_input = 0;
gl::GenVertexArrays(1, &mut vertex_input);
check_gl_errors();
gl::BindVertexArray(vertex_input);
check_gl_errors();
gl::EnableVertexAttribArray(0);
check_gl_errors();
gl::VertexAttribPointer(
0, 2, gl::INT, gl::FALSE as GLboolean, 0, 0 as *const GLvoid
);
check_gl_errors();
let mut indexes = 0;
gl::GenBuffers(1, &mut indexes);
check_gl_errors();
gl::BindBuffer(gl::ELEMENT_ARRAY_BUFFER, indexes);
check_gl_errors();
gl::BufferData(
gl::ELEMENT_ARRAY_BUFFER,
4 * 4,
INDEXES.as_ptr() as *const std::ffi::c_void,
gl::STATIC_DRAW
);
check_gl_errors();
gl::DrawElements(gl::TRIANGLE_FAN, 4, gl::UNSIGNED_INT, std::ptr::null());
check_gl_errors();
}
}
fn format_error(e: GLenum) -> &'static str {
match e {
gl::NO_ERROR => "No error",
gl::INVALID_ENUM => "Invalid enum",
gl::INVALID_VALUE => "Invalid value",
gl::INVALID_OPERATION => "Invalid operation",
gl::INVALID_FRAMEBUFFER_OPERATION => "Invalid framebuffer operation",
gl::OUT_OF_MEMORY => "Out of memory",
gl::STACK_UNDERFLOW => "Stack underflow",
gl::STACK_OVERFLOW => "Stack overflow",
_ => "Unknown error"
}
}
pub fn check_gl_errors() {
unsafe {
match gl::GetError() {
gl::NO_ERROR => (),
e => {
panic!("OpenGL error: {}", format_error(e))
}
}
}
}
unsafe fn check_shader_status(shader: GLuint) {
let mut status = gl::FALSE as GLint;
gl::GetShaderiv(shader, gl::COMPILE_STATUS, &mut status);
if status != (gl::TRUE as GLint) {
let mut len = 0;
gl::GetProgramiv(shader, gl::INFO_LOG_LENGTH, &mut len);
if len > 0 {
let mut buf = Vec::with_capacity(len as usize);
buf.set_len((len as usize) - 1); // subtract 1 to skip the trailing null character
gl::GetProgramInfoLog(
shader,
len,
ptr::null_mut(),
buf.as_mut_ptr() as *mut GLchar,
);
let log = String::from_utf8(buf).unwrap();
eprintln!("shader compilation log:\n{}", log);
}
panic!("shader compilation failed");
}
}

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extern crate gl;
extern crate khronos_egl as egl;
extern crate wayland_client;
extern crate wayland_egl;
extern crate wayland_protocols;
use std::sync::Arc;
use std::sync::atomic::{AtomicBool, Ordering};
use std::ptr;
use std::ffi::CStr;
use gl::types::{GLint, GLuint, GLchar, GLenum, GLboolean, GLvoid};
use egl::API as egl;
use wayland_client::{
protocol::{wl_compositor::WlCompositor, wl_surface::WlSurface},
DispatchData, Display, EventQueue, Main
};
use wayland_protocols::xdg_shell::client::{
xdg_surface::{self, XdgSurface},
xdg_wm_base::{self, XdgWmBase},
};
fn process_xdg_event(xdg: Main<XdgWmBase>, event: xdg_wm_base::Event, _dd: DispatchData) {
use xdg_wm_base::Event::*;
match event {
Ping { serial } => xdg.pong(serial),
_ => (),
}
}
struct DisplayConnection {
display: Display,
event_queue: EventQueue,
compositor: Main<WlCompositor>,
xdg: Main<XdgWmBase>,
}
fn setup_wayland() -> DisplayConnection {
let display =
wayland_client::Display::connect_to_env().expect("unable to connect to the wayland server");
let mut event_queue = display.create_event_queue();
let attached_display = display.clone().attach(event_queue.token());
let globals = wayland_client::GlobalManager::new(&attached_display);
// Roundtrip to retrieve the globals list
event_queue
.sync_roundtrip(&mut (), |_, _, _| unreachable!())
.unwrap();
// Get the compositor.
let compositor: Main<WlCompositor> = globals.instantiate_exact(1).unwrap();
// Xdg protocol.
let xdg: Main<XdgWmBase> = globals.instantiate_exact(1).unwrap();
xdg.quick_assign(process_xdg_event);
DisplayConnection {
display,
event_queue,
compositor,
xdg,
}
}
fn setup_egl(display: &Display) -> egl::Display {
let egl_display = egl.get_display(display.get_display_ptr() as *mut std::ffi::c_void).unwrap();
egl.initialize(egl_display).unwrap();
egl_display
}
fn create_context(display: egl::Display) -> (egl::Context, egl::Config) {
let attributes = [
egl::RED_SIZE,
8,
egl::GREEN_SIZE,
8,
egl::BLUE_SIZE,
8,
egl::NONE,
];
let config = egl.choose_first_config(display, &attributes)
.expect("unable to choose an EGL configuration")
.expect("no EGL configuration found");
let context_attributes = [
egl::CONTEXT_MAJOR_VERSION,
4,
egl::CONTEXT_MINOR_VERSION,
0,
egl::CONTEXT_OPENGL_PROFILE_MASK,
egl::CONTEXT_OPENGL_CORE_PROFILE_BIT,
egl::NONE,
];
let context = egl.create_context(display, config, None, &context_attributes)
.expect("unable to create an EGL context");
(context, config)
}
struct Surface {
handle: Main<WlSurface>,
initialized: AtomicBool
}
fn create_surface(
ctx: &DisplayConnection,
egl_display: egl::Display,
egl_context: egl::Context,
egl_config: egl::Config,
width: i32,
height: i32,
) -> Arc<Surface> {
let wl_surface = ctx.compositor.create_surface();
let xdg_surface = ctx.xdg.get_xdg_surface(&wl_surface);
let xdg_toplevel = xdg_surface.get_toplevel();
xdg_toplevel.set_app_id("khronos-egl-test".to_string());
xdg_toplevel.set_title("Test".to_string());
wl_surface.commit();
ctx.display.flush().unwrap();
let surface = Arc::new(Surface {
handle: wl_surface,
initialized: AtomicBool::new(false)
});
let weak_surface = Arc::downgrade(&surface);
xdg_surface.quick_assign(move |xdg_surface: Main<XdgSurface>, event: xdg_surface::Event, _dd: DispatchData| {
use xdg_surface::Event::*;
match event {
Configure { serial } => {
if let Some(surface) = weak_surface.upgrade() {
if !surface.initialized.swap(true, Ordering::Relaxed) {
let wl_egl_surface = wayland_egl::WlEglSurface::new(&surface.handle, width, height);
let egl_surface = unsafe {
egl.create_window_surface(
egl_display,
egl_config,
wl_egl_surface.ptr() as egl::NativeWindowType,
None,
)
.expect("unable to create an EGL surface")
};
egl.make_current(egl_display, Some(egl_surface), Some(egl_surface), Some(egl_context))
.expect("unable to bind the context");
render();
egl.swap_buffers(egl_display, egl_surface)
.expect("unable to post the surface content");
xdg_surface.ack_configure(serial);
}
}
},
_ => (),
}
});
surface
}
fn main() {
// Setup Open GL.
egl.bind_api(egl::OPENGL_API)
.expect("unable to select OpenGL API");
gl::load_with(|name| egl.get_proc_address(name).unwrap() as *const std::ffi::c_void);
// Setup the Wayland client.
let mut ctx = setup_wayland();
// Setup EGL.
let egl_display = setup_egl(&ctx.display);
let (egl_context, egl_config) = create_context(egl_display);
// Create a surface.
// Note that it must be kept alive to the end of execution.
let _surface = create_surface(&ctx, egl_display, egl_context, egl_config, 800, 600);
loop {
ctx.event_queue
.dispatch(&mut (), |_, _, _| { /* we ignore unfiltered messages */ })
.unwrap();
}
}
const VERTEX: &'static [GLint; 8] = &[
-1, -1,
1, -1,
1, 1,
-1, 1
];
const INDEXES: &'static [GLuint; 4] = &[
0, 1, 2, 3
];
const VERTEX_SHADER: &[u8] = b"#version 400
in vec2 position;
void main() {
gl_Position = vec4(position, 0.0f, 1.0f);
}
\0";
const FRAGMENT_SHADER: &[u8] = b"#version 400
out vec4 color;
void main() {
color = vec4(1.0f, 0.0f, 0.0f, 1.0f);
}
\0";
fn render() {
unsafe {
let vertex_shader = gl::CreateShader(gl::VERTEX_SHADER);
check_gl_errors();
let src = CStr::from_bytes_with_nul_unchecked(VERTEX_SHADER).as_ptr();
gl::ShaderSource(vertex_shader, 1, (&[src]).as_ptr(), ptr::null());
check_gl_errors();
gl::CompileShader(vertex_shader);
check_shader_status(vertex_shader);
let fragment_shader = gl::CreateShader(gl::FRAGMENT_SHADER);
check_gl_errors();
let src = CStr::from_bytes_with_nul_unchecked(FRAGMENT_SHADER).as_ptr();
gl::ShaderSource(fragment_shader, 1, (&[src]).as_ptr(), ptr::null());
check_gl_errors();
gl::CompileShader(fragment_shader);
check_shader_status(fragment_shader);
let program = gl::CreateProgram();
check_gl_errors();
gl::AttachShader(program, vertex_shader);
check_gl_errors();
gl::AttachShader(program, fragment_shader);
check_gl_errors();
gl::LinkProgram(program);
check_gl_errors();
gl::UseProgram(program);
check_gl_errors();
let mut buffer = 0;
gl::GenBuffers(1, &mut buffer);
check_gl_errors();
gl::BindBuffer(gl::ARRAY_BUFFER, buffer);
check_gl_errors();
gl::BufferData(
gl::ARRAY_BUFFER,
8 * 4,
VERTEX.as_ptr() as *const std::ffi::c_void,
gl::STATIC_DRAW
);
check_gl_errors();
let mut vertex_input = 0;
gl::GenVertexArrays(1, &mut vertex_input);
check_gl_errors();
gl::BindVertexArray(vertex_input);
check_gl_errors();
gl::EnableVertexAttribArray(0);
check_gl_errors();
gl::VertexAttribPointer(
0, 2, gl::INT, gl::FALSE as GLboolean, 0, 0 as *const GLvoid
);
check_gl_errors();
let mut indexes = 0;
gl::GenBuffers(1, &mut indexes);
check_gl_errors();
gl::BindBuffer(gl::ELEMENT_ARRAY_BUFFER, indexes);
check_gl_errors();
gl::BufferData(
gl::ELEMENT_ARRAY_BUFFER,
4 * 4,
INDEXES.as_ptr() as *const std::ffi::c_void,
gl::STATIC_DRAW
);
check_gl_errors();
gl::DrawElements(gl::TRIANGLE_FAN, 4, gl::UNSIGNED_INT, std::ptr::null());
check_gl_errors();
}
}
fn format_error(e: GLenum) -> &'static str {
match e {
gl::NO_ERROR => "No error",
gl::INVALID_ENUM => "Invalid enum",
gl::INVALID_VALUE => "Invalid value",
gl::INVALID_OPERATION => "Invalid operation",
gl::INVALID_FRAMEBUFFER_OPERATION => "Invalid framebuffer operation",
gl::OUT_OF_MEMORY => "Out of memory",
gl::STACK_UNDERFLOW => "Stack underflow",
gl::STACK_OVERFLOW => "Stack overflow",
_ => "Unknown error"
}
}
pub fn check_gl_errors() {
unsafe {
match gl::GetError() {
gl::NO_ERROR => (),
e => {
panic!("OpenGL error: {}", format_error(e))
}
}
}
}
unsafe fn check_shader_status(shader: GLuint) {
let mut status = gl::FALSE as GLint;
gl::GetShaderiv(shader, gl::COMPILE_STATUS, &mut status);
if status != (gl::TRUE as GLint) {
let mut len = 0;
gl::GetProgramiv(shader, gl::INFO_LOG_LENGTH, &mut len);
if len > 0 {
let mut buf = Vec::with_capacity(len as usize);
buf.set_len((len as usize) - 1); // subtract 1 to skip the trailing null character
gl::GetProgramInfoLog(
shader,
len,
ptr::null_mut(),
buf.as_mut_ptr() as *mut GLchar,
);
let log = String::from_utf8(buf).unwrap();
eprintln!("shader compilation log:\n{}", log);
}
panic!("shader compilation failed");
}
}

11
third-party/vendor/khronos-egl/shell-wayland.nix vendored Normal file
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@ -0,0 +1,11 @@
{ pkgs ? import <nixpkgs> {} }:
pkgs.mkShell {
buildInputs = [
pkgs.gcc
pkgs.libGL
pkgs.pkg-config
pkgs.wayland
];
LD_LIBRARY_PATH="${pkgs.libGL}/lib";
}

10
third-party/vendor/khronos-egl/shell.nix vendored Normal file
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@ -0,0 +1,10 @@
{ pkgs ? import <nixpkgs> {} }:
pkgs.mkShell {
buildInputs = [
pkgs.gcc
pkgs.libGL
pkgs.pkg-config
];
LD_LIBRARY_PATH="${pkgs.libGL}/lib";
}

2363
third-party/vendor/khronos-egl/src/lib.rs vendored Normal file
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