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|
use crate::{Renderer, Settings, Viewport};
use glow::HasContext;
use iced_native::mouse;
use raw_window_handle::HasRawWindowHandle;
/// A window graphics backend for iced powered by `glow`.
#[allow(missing_debug_implementations)]
pub struct Compositor {
connection: surfman::Connection,
device: surfman::Device,
gl_context: surfman::Context,
gl: Option<glow::Context>,
}
impl iced_graphics::window::Compositor for Compositor {
type Settings = Settings;
type Renderer = Renderer;
type Surface = ();
type SwapChain = ();
fn new(_settings: Self::Settings) -> Self {
let connection = surfman::Connection::new().expect("Create connection");
let adapter = connection
.create_hardware_adapter()
.expect("Create adapter");
let mut device =
connection.create_device(&adapter).expect("Create device");
let context_descriptor = device
.create_context_descriptor(&surfman::ContextAttributes {
version: surfman::GLVersion::new(3, 0),
flags: surfman::ContextAttributeFlags::empty(),
})
.expect("Create context descriptor");
let gl_context = device
.create_context(&context_descriptor)
.expect("Create context");
Self {
connection,
device,
gl_context,
gl: None,
}
}
fn create_renderer(&mut self, settings: Settings) -> Renderer {
self.device
.make_context_current(&self.gl_context)
.expect("Make context current");
Renderer::new(crate::Backend::new(self.gl.as_ref().unwrap(), settings))
}
fn create_surface<W: HasRawWindowHandle>(
&mut self,
window: &W,
) -> Self::Surface {
let native_widget = self
.connection
.create_native_widget_from_rwh(window.raw_window_handle())
.expect("Create widget");
let surface = self
.device
.create_surface(
&self.gl_context,
surfman::SurfaceAccess::GPUOnly,
surfman::SurfaceType::Widget { native_widget },
)
.expect("Create surface");
let surfman::SurfaceInfo { .. } = self.device.surface_info(&surface);
self.device
.bind_surface_to_context(&mut self.gl_context, surface)
.expect("Bind surface to context");
self.device
.make_context_current(&self.gl_context)
.expect("Make context current");
self.gl = Some(glow::Context::from_loader_function(|s| {
self.device.get_proc_address(&self.gl_context, s)
}));
//let mut framebuffer =
// skia_safe::gpu::gl::FramebufferInfo::from_fboid(framebuffer_object);
//framebuffer.format = gl::RGBA8;
//framebuffer
}
fn create_swap_chain(
&mut self,
_surface: &Self::Surface,
width: u32,
height: u32,
) -> Self::SwapChain {
let mut surface = self
.device
.unbind_surface_from_context(&mut self.gl_context)
.expect("Unbind surface")
.expect("Active surface");
self.device
.resize_surface(
&self.gl_context,
&mut surface,
euclid::Size2D::new(width as i32, height as i32),
)
.expect("Resize surface");
self.device
.bind_surface_to_context(&mut self.gl_context, surface)
.expect("Bind surface to context");
let gl = self.gl.as_ref().unwrap();
unsafe {
gl.viewport(0, 0, width as i32, height as i32);
gl.clear_color(1.0, 1.0, 1.0, 1.0);
// Enable auto-conversion from/to sRGB
gl.enable(glow::FRAMEBUFFER_SRGB);
// Enable alpha blending
gl.enable(glow::BLEND);
gl.blend_func(glow::SRC_ALPHA, glow::ONE_MINUS_SRC_ALPHA);
}
}
fn draw<T: AsRef<str>>(
&mut self,
renderer: &mut Self::Renderer,
swap_chain: &mut Self::SwapChain,
viewport: &Viewport,
output: &<Self::Renderer as iced_native::Renderer>::Output,
overlay: &[T],
) -> mouse::Interaction {
let gl = self.gl.as_ref().unwrap();
unsafe {
gl.clear(glow::COLOR_BUFFER_BIT);
}
let mouse = renderer.backend_mut().draw(gl, viewport, output, overlay);
{
let mut surface = self
.device
.unbind_surface_from_context(&mut self.gl_context)
.expect("Unbind surface")
.expect("Active surface");
self.device
.present_surface(&self.gl_context, &mut surface)
.expect("Present surface");
self.device
.bind_surface_to_context(&mut self.gl_context, surface)
.expect("Bind surface to context");
}
mouse
}
}
impl Drop for Compositor {
fn drop(&mut self) {
self.device
.destroy_context(&mut self.gl_context)
.expect("Destroy context");
}
}
|
