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use crate::{Backend, Color, Renderer, Settings, Viewport};
use core::ffi::c_void;
use glow::HasContext;
use iced_graphics::{Antialiasing, Size};
use iced_native::mouse;
#[allow(missing_debug_implementations)]
pub struct Compositor {
gl: glow::Context,
}
impl iced_graphics::window::GLCompositor for Compositor {
type Settings = Settings;
type Renderer = Renderer;
unsafe fn new(
settings: Self::Settings,
loader_function: impl FnMut(&str) -> *const c_void,
) -> (Self, Self::Renderer) {
let gl = glow::Context::from_loader_function(loader_function);
gl.enable(glow::FRAMEBUFFER_SRGB);
gl.enable(glow::BLEND);
gl.blend_func(glow::SRC_ALPHA, glow::ONE_MINUS_SRC_ALPHA);
gl.disable(glow::MULTISAMPLE);
let renderer = Renderer::new(Backend::new(&gl, settings));
(Self { gl }, renderer)
}
fn sample_count(settings: &Settings) -> u32 {
settings
.antialiasing
.map(Antialiasing::sample_count)
.unwrap_or(0)
}
fn resize_viewport(&mut self, physical_size: Size<u32>) {
unsafe {
self.gl.viewport(
0,
0,
physical_size.width as i32,
physical_size.height as i32,
);
}
}
fn draw<T: AsRef<str>>(
&mut self,
renderer: &mut Self::Renderer,
viewport: &Viewport,
color: Color,
output: &<Self::Renderer as iced_native::Renderer>::Output,
overlay: &[T],
) -> mouse::Interaction {
let gl = &self.gl;
let [r, g, b, a] = color.into_linear();
unsafe {
gl.clear_color(r, g, b, a);
gl.clear(glow::COLOR_BUFFER_BIT);
}
renderer.backend_mut().draw(gl, viewport, output, overlay)
}
}