add wrapper struct to simplify imgui init and usage

rather than forcing use of 3 separate structs

ggdt_imgui/src/lib.rs

@@ -1,2 +1,52 @@
+use crate::platform::Platform;
+use crate::renderer::Renderer;
+use ggdt::graphics::bitmap::rgb::RgbaBitmap;
+use ggdt::system::event::{SystemEvent, SystemEventHandler};
+use ggdt::system::res::standard::Standard;
+use ggdt::system::System;
+
 pub mod platform;
 pub mod renderer;
+
+#[derive(Debug)]
+pub struct ImGui {
+	context: imgui::Context,
+	platform: Platform,
+	renderer: Renderer,
+}
+
+impl ImGui {
+	pub fn new() -> Self {
+		let mut context = imgui::Context::create();
+		let platform = Platform::new(&mut context);
+		let renderer = Renderer::new(&mut context);
+
+		ImGui { context, platform, renderer }
+	}
+
+	pub fn new_frame(&mut self, system: &mut System<Standard>) -> &mut imgui::Ui {
+		self.platform.prepare_frame(&mut self.context, system);
+		self.context.new_frame()
+	}
+
+	pub fn render(&mut self, dest: &mut RgbaBitmap) {
+		let draw_data = self.context.render();
+		self.renderer.render(draw_data, dest)
+	}
+
+	#[inline]
+	pub fn context(&self) -> &imgui::Context {
+		&self.context
+	}
+
+	#[inline]
+	pub fn context_mut(&mut self) -> &mut imgui::Context {
+		&mut self.context
+	}
+}
+
+impl SystemEventHandler for ImGui {
+	fn handle_event(&mut self, event: &SystemEvent) -> bool {
+		self.platform.handle_event(&mut self.context, event)
+	}
+}

ggdt_imgui/src/platform.rs

@@ -136,6 +136,7 @@ fn handle_mouse_button_event(io: &mut imgui::Io, button: MouseButton, down: bool
 	}
 }
 
+#[derive(Debug)]
 pub struct Platform {
 	last_frame: Instant,
 }

ggdt_imgui/src/renderer.rs

@@ -4,6 +4,7 @@ use ggdt::math::rect::Rect;
 use ggdt::math::vector2::Vector2;
 use imgui::internal::RawWrapper;
 
+#[derive(Debug)]
 pub struct Renderer {
 	pub texture_map: imgui::Textures<RgbaBitmap>,
 }