1 files changed, 175 insertions, 0 deletions
diff --git a/examples/integration_opengl/src/main.rs b/examples/integration_opengl/src/main.rs
new file mode 100644
index 00000000..925102e3
--- /dev/null
+++ b/examples/integration_opengl/src/main.rs
@@ -0,0 +1,175 @@
+mod controls;
+mod scene;
+
+use controls::Controls;
+use scene::Scene;
+
+use glow;
+use glow::*;
+use iced_glow::{Backend, Renderer, Settings, Viewport};
+use iced_glutin::glutin;
+use iced_glutin::glutin::event::{Event, WindowEvent};
+use iced_glutin::glutin::event_loop::ControlFlow;
+use iced_glutin::{program, Clipboard, Debug, Size};
+use iced_winit::conversion;
+use iced_winit::winit;
+use winit::{dpi::PhysicalPosition, event::ModifiersState};
+
+pub fn main() {
+    env_logger::init();
+    let (gl, event_loop, windowed_context, shader_version) = {
+        let el = glutin::event_loop::EventLoop::new();
+        let wb = glutin::window::WindowBuilder::new()
+            .with_title("OpenGL integration example")
+            .with_inner_size(glutin::dpi::LogicalSize::new(1024.0, 768.0));
+        let windowed_context = glutin::ContextBuilder::new()
+            .with_vsync(true)
+            .build_windowed(wb, &el)
+            .unwrap();
+        unsafe {
+            let windowed_context = windowed_context.make_current().unwrap();
+            let gl = glow::Context::from_loader_function(|s| {
+                windowed_context.get_proc_address(s) as *const _
+            });
+            // 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);
+
+            // Disable multisampling by default
+            gl.disable(glow::MULTISAMPLE);
+            (gl, el, windowed_context, "#version 410")
+        }
+    };
+
+    let physical_size = windowed_context.window().inner_size();
+    let mut viewport = Viewport::with_physical_size(
+        Size::new(physical_size.width, physical_size.height),
+        windowed_context.window().scale_factor(),
+    );
+
+    let mut cursor_position = PhysicalPosition::new(-1.0, -1.0);
+    let mut modifiers = ModifiersState::default();
+    let mut clipboard = Clipboard::connect(&windowed_context.window());
+
+    let mut renderer = Renderer::new(Backend::new(&gl, Settings::default()));
+
+    let mut debug = Debug::new();
+
+    let controls = Controls::new();
+    let mut state = program::State::new(
+        controls,
+        viewport.logical_size(),
+        conversion::cursor_position(cursor_position, viewport.scale_factor()),
+        &mut renderer,
+        &mut debug,
+    );
+    let mut resized = false;
+
+    event_loop.run(move |event, _, control_flow| {
+        let scene = Scene::new(&gl, &shader_version);
+        *control_flow = ControlFlow::Wait;
+
+        match event {
+            Event::LoopDestroyed => return,
+            Event::WindowEvent { event, .. } => {
+                match event {
+                    WindowEvent::CursorMoved { position, .. } => {
+                        cursor_position = position;
+                    }
+                    WindowEvent::ModifiersChanged(new_modifiers) => {
+                        modifiers = new_modifiers;
+                    }
+                    WindowEvent::Resized(physical_size) => {
+                        viewport = Viewport::with_physical_size(
+                            Size::new(
+                                physical_size.width,
+                                physical_size.height,
+                            ),
+                            windowed_context.window().scale_factor(),
+                        );
+
+                        resized = true;
+                    }
+                    WindowEvent::CloseRequested => {
+                        scene.cleanup(&gl);
+                        *control_flow = ControlFlow::Exit
+                    }
+                    _ => (),
+                }
+
+                // Map window event to iced event
+                if let Some(event) = iced_winit::conversion::window_event(
+                    &event,
+                    windowed_context.window().scale_factor(),
+                    modifiers,
+                ) {
+                    state.queue_event(event);
+                }
+            }
+            Event::MainEventsCleared => {
+                // If there are events pending
+                if !state.is_queue_empty() {
+                    // We update iced
+                    let _ = state.update(
+                        viewport.logical_size(),
+                        conversion::cursor_position(
+                            cursor_position,
+                            viewport.scale_factor(),
+                        ),
+                        &mut renderer,
+                        &mut clipboard,
+                        &mut debug,
+                    );
+
+                    // and request a redraw
+                    windowed_context.window().request_redraw();
+                }
+            }
+            Event::RedrawRequested(_) => {
+                if resized {
+                    let size = windowed_context.window().inner_size();
+
+                    unsafe {
+                        gl.viewport(
+                            0,
+                            0,
+                            size.width as i32,
+                            size.height as i32,
+                        );
+                    }
+
+                    resized = false;
+                }
+
+                let program = state.program();
+                {
+                    // We clear the frame
+                    scene.clear(&gl, program.background_color());
+
+                    // Draw the scene
+                    scene.draw(&gl);
+                }
+
+                // And then iced on top
+                let mouse_interaction = renderer.backend_mut().draw(
+                    &gl,
+                    &viewport,
+                    state.primitive(),
+                    &debug.overlay(),
+                );
+                // Update the mouse cursor
+                windowed_context.window().set_cursor_icon(
+                    iced_winit::conversion::mouse_interaction(
+                        mouse_interaction,
+                    ),
+                );
+
+                windowed_context.swap_buffers().unwrap();
+            }
+            _ => (),
+        }
+    });
+}