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Simplify OpenGL examples to use platform builder API to enforce a GL supported renderer

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This commit is contained in:
Simon Hausmann 2024-10-23 11:22:17 +02:00
parent 687e4ce95b
commit df55e5563b
2 changed files with 89 additions and 85 deletions
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100
examples/opengl_underlay/main.rs
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@ -176,67 +176,69 @@ pub fn main() {
#[cfg(all(debug_assertions, target_arch = "wasm32"))]
console_error_panic_hook::set_once();
let platform = slint::platform::PlatformBuilder::new()
.with_opengl_api(slint::OpenGLAPI::GLES(None))
.build()
.expect("Unable to create Slint backend with OpenGL ES renderer");
slint::platform::set_platform(platform).unwrap();
let app = App::new().unwrap();
let mut underlay = None;
let app_weak = app.as_weak();
if let Err(error) = app.window().set_rendering_notifier(move |state, graphics_api| {
// eprintln!("rendering state {:#?}", state);
app.window()
.set_rendering_notifier(move |state, graphics_api| {
// eprintln!("rendering state {:#?}", state);
match state {
slint::RenderingState::RenderingSetup => {
let context = match graphics_api {
#[cfg(not(target_arch = "wasm32"))]
slint::GraphicsAPI::NativeOpenGL { get_proc_address } => unsafe {
glow::Context::from_loader_function_cstr(|s| get_proc_address(s))
},
#[cfg(target_arch = "wasm32")]
slint::GraphicsAPI::WebGL { canvas_element_id, context_type } => {
use wasm_bindgen::JsCast;
match state {
slint::RenderingState::RenderingSetup => {
let context = match graphics_api {
#[cfg(not(target_arch = "wasm32"))]
slint::GraphicsAPI::NativeOpenGL { get_proc_address } => unsafe {
glow::Context::from_loader_function_cstr(|s| get_proc_address(s))
},
#[cfg(target_arch = "wasm32")]
slint::GraphicsAPI::WebGL { canvas_element_id, context_type } => {
use wasm_bindgen::JsCast;
let canvas = web_sys::window()
.unwrap()
.document()
.unwrap()
.get_element_by_id(canvas_element_id)
.unwrap()
.dyn_into::<web_sys::HtmlCanvasElement>()
.unwrap();
let canvas = web_sys::window()
.unwrap()
.document()
.unwrap()
.get_element_by_id(canvas_element_id)
.unwrap()
.dyn_into::<web_sys::HtmlCanvasElement>()
.unwrap();
let webgl1_context = canvas
.get_context(context_type)
.unwrap()
.unwrap()
.dyn_into::<web_sys::WebGl2RenderingContext>()
.unwrap();
let webgl1_context = canvas
.get_context(context_type)
.unwrap()
.unwrap()
.dyn_into::<web_sys::WebGl2RenderingContext>()
.unwrap();
glow::Context::from_webgl2_context(webgl1_context)
}
_ => return,
};
underlay = Some(EGLUnderlay::new(context))
}
slint::RenderingState::BeforeRendering => {
if let (Some(underlay), Some(app)) = (underlay.as_mut(), app_weak.upgrade()) {
underlay.render(app.get_rotation_enabled());
app.window().request_redraw();
glow::Context::from_webgl2_context(webgl1_context)
}
_ => return,
};
underlay = Some(EGLUnderlay::new(context))
}
slint::RenderingState::BeforeRendering => {
if let (Some(underlay), Some(app)) = (underlay.as_mut(), app_weak.upgrade()) {
underlay.render(app.get_rotation_enabled());
app.window().request_redraw();
}
}
slint::RenderingState::AfterRendering => {}
slint::RenderingState::RenderingTeardown => {
drop(underlay.take());
}
_ => {}
}
slint::RenderingState::AfterRendering => {}
slint::RenderingState::RenderingTeardown => {
drop(underlay.take());
}
_ => {}
}
}) {
match error {
slint::SetRenderingNotifierError::Unsupported => eprintln!("This example requires the use of the GL backend. Please run with the environment variable SLINT_BACKEND=GL set."),
_ => unreachable!()
}
std::process::exit(1);
}
})
.expect("Unable to set rendering notifier");
app.run().unwrap();
}