[gpu] Add graphics and adapter

src/main.rs

@@ -1,3 +1,7 @@
+use std::time::Duration;
+use sdl2::event::Event;
+use sdl2::keyboard::Keycode;
+use sdl2::pixels::Color;
 use simple_logger::SimpleLogger;
 use crate::emu::iomem::MemoryMappedIO;
 use crate::emu::ram::RamMemory;
@@ -21,5 +25,40 @@ fn main() -> EmulatorResult<()> {
         log::info!("Memory at {} is {}",i,mmu.try_get_byte(i)?);
     }
 
+    let sdl_context = sdl2::init().unwrap();
+    let video_subsystem = sdl_context.video().unwrap();
+
+    let window = video_subsystem.window("rust-sdl2 demo", 512, 512)
+        .position_centered()
+        .build()
+        .unwrap();
+    let mut canvas = window.into_canvas().build().unwrap();
+
+    canvas.set_draw_color(Color::RGB(0, 255, 255));
+    canvas.clear();
+    canvas.present();
+    let mut event_pump = sdl_context.event_pump().unwrap();
+    let mut i = 0;
+    'running: loop {
+        i = (i + 1) % 255;
+        canvas.set_draw_color(Color::RGB(i, 64, 255 - i));
+        canvas.clear();
+        for event in event_pump.poll_iter() {
+            match event {
+                Event::Quit {..} |
+                Event::KeyDown { keycode: Some(Keycode::Escape), .. } => {
+                    break 'running
+                },
+                event => {
+                    log::info!("Received window event {:?}",event);
+                }
+            }
+        }
+        // The rest of the game loop goes here...
+
+        canvas.present();
+        ::std::thread::sleep(Duration::new(0, 1_000_000_000u32 / 60));
+    }
+
     Ok(())
 }