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//! The graphics platform that is used by the renderer.
use std::num::NonZeroU32;
use glutin::config::{ColorBufferType, Config, ConfigTemplateBuilder, GetGlConfig};
use glutin::context::{
ContextApi, ContextAttributesBuilder, GlProfile, NotCurrentContext, Version,
};
use glutin::display::{Display, DisplayApiPreference, GetGlDisplay};
use glutin::error::Result as GlutinResult;
use glutin::prelude::*;
use glutin::surface::{Surface, SurfaceAttributesBuilder, WindowSurface};
use raw_window_handle::{RawDisplayHandle, RawWindowHandle};
use winit::dpi::PhysicalSize;
#[cfg(all(feature = "x11", not(any(target_os = "macos", windows))))]
use winit::platform::x11;
/// Create the GL display.
pub fn create_gl_display(
raw_display_handle: RawDisplayHandle,
_raw_window_handle: Option<RawWindowHandle>,
) -> GlutinResult<Display> {
#[cfg(target_os = "macos")]
let preference = DisplayApiPreference::Cgl;
#[cfg(windows)]
let preference = DisplayApiPreference::Wgl(Some(_raw_window_handle.unwrap()));
#[cfg(all(feature = "x11", not(any(target_os = "macos", windows))))]
let preference = DisplayApiPreference::GlxThenEgl(Box::new(x11::register_xlib_error_hook));
#[cfg(all(not(feature = "x11"), not(any(target_os = "macos", windows))))]
let preference = DisplayApiPreference::Egl;
let display = unsafe { Display::new(raw_display_handle, preference)? };
log::info!("Using {}", { display.version_string() });
Ok(display)
}
pub fn pick_gl_config(
gl_display: &Display,
raw_window_handle: Option<RawWindowHandle>,
) -> Result<Config, String> {
let mut default_config = ConfigTemplateBuilder::new()
.with_depth_size(0)
.with_stencil_size(0)
.with_transparency(true);
if let Some(raw_window_handle) = raw_window_handle {
default_config = default_config.compatible_with_native_window(raw_window_handle);
}
let config_10bit = default_config
.clone()
.with_buffer_type(ColorBufferType::Rgb { r_size: 10, g_size: 10, b_size: 10 })
.with_alpha_size(2);
let configs = [
default_config.clone(),
config_10bit.clone(),
default_config.with_transparency(false),
config_10bit.with_transparency(false),
];
for config in configs {
let gl_config = unsafe {
gl_display.find_configs(config.build()).ok().and_then(|mut configs| configs.next())
};
if let Some(gl_config) = gl_config {
return Ok(gl_config);
}
}
Err(String::from("failed to find suitable GL configuration."))
}
pub fn create_gl_context(
gl_display: &Display,
gl_config: &Config,
raw_window_handle: Option<RawWindowHandle>,
) -> GlutinResult<NotCurrentContext> {
let mut profiles = [
ContextAttributesBuilder::new()
.with_context_api(ContextApi::OpenGl(Some(Version::new(3, 3))))
.build(raw_window_handle),
// Try gles before OpenGL 2.1 as it tends to be more stable.
ContextAttributesBuilder::new()
.with_context_api(ContextApi::Gles(Some(Version::new(2, 0))))
.build(raw_window_handle),
ContextAttributesBuilder::new()
.with_profile(GlProfile::Compatibility)
.with_context_api(ContextApi::OpenGl(Some(Version::new(2, 1))))
.build(raw_window_handle),
]
.into_iter();
// Try the optimal config first.
let mut picked_context =
unsafe { gl_display.create_context(gl_config, &profiles.next().unwrap()) };
// Try the fallback ones.
while let (Err(_), Some(profile)) = (picked_context.as_ref(), profiles.next()) {
picked_context = unsafe { gl_display.create_context(gl_config, &profile) };
}
picked_context
}
pub fn create_gl_surface(
gl_context: &NotCurrentContext,
size: PhysicalSize<u32>,
raw_window_handle: RawWindowHandle,
) -> GlutinResult<Surface<WindowSurface>> {
// Get the display and the config used to create that context.
let gl_display = gl_context.display();
let gl_config = gl_context.config();
let surface_attributes =
SurfaceAttributesBuilder::<WindowSurface>::new().with_srgb(Some(false)).build(
raw_window_handle,
NonZeroU32::new(size.width).unwrap(),
NonZeroU32::new(size.height).unwrap(),
);
// Create the GL surface to draw into.
unsafe { gl_display.create_window_surface(&gl_config, &surface_attributes) }
}
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