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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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74
examples/opengl_texture/main.rs
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@ -398,51 +398,53 @@ impl DemoRenderer {
}
fn main() {
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 {
slint::GraphicsAPI::NativeOpenGL { get_proc_address } => unsafe {
glow::Context::from_loader_function_cstr(|s| get_proc_address(s))
},
_ => return,
};
underlay = Some(DemoRenderer::new(context))
}
slint::RenderingState::BeforeRendering => {
if let (Some(underlay), Some(app)) = (underlay.as_mut(), app_weak.upgrade()) {
let texture = underlay.render(
app.get_selected_red(),
app.get_selected_green(),
app.get_selected_blue(),
app.get_requested_texture_width() as u32,
app.get_requested_texture_height() as u32,
);
app.set_texture(slint::Image::from(texture));
app.window().request_redraw();
match state {
slint::RenderingState::RenderingSetup => {
let context = match graphics_api {
slint::GraphicsAPI::NativeOpenGL { get_proc_address } => unsafe {
glow::Context::from_loader_function_cstr(|s| get_proc_address(s))
},
_ => return,
};
underlay = Some(DemoRenderer::new(context))
}
slint::RenderingState::BeforeRendering => {
if let (Some(underlay), Some(app)) = (underlay.as_mut(), app_weak.upgrade()) {
let texture = underlay.render(
app.get_selected_red(),
app.get_selected_green(),
app.get_selected_blue(),
app.get_requested_texture_width() as u32,
app.get_requested_texture_height() as u32,
);
app.set_texture(slint::Image::from(texture));
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();
}