[gpu] Add graphics and adapter

src/graphics/graphics_adapter.rs

@@ -0,0 +1,17 @@
+use crate::emu::graphics::{DEVICE_FRAMEBUFFER_SIZE, GraphicsProcessor};
+use crate::misc::result::EmulatorResult;
+
+pub trait GraphicsAdapter{
+    fn draw(&mut self,frame_buf:&[u8;DEVICE_FRAMEBUFFER_SIZE])->EmulatorResult<()>;
+}
+
+pub struct SDLGraphicsAdapter{
+    graphics_processor: GraphicsProcessor
+}
+
+impl GraphicsAdapter for SDLGraphicsAdapter{
+    fn draw(&mut self, frame_buf: &[u8; DEVICE_FRAMEBUFFER_SIZE]) -> EmulatorResult<()> {
+        todo!()
+    }
+}
+