gpu: refactor: Give the Gpu a handle to the video device.

Use it to render to the screen instead of doing it in the outer Gba


Former-commit-id: ea1ed5f4d7b00d1542ce1130f96ccb1bdb87cb3e

src/core/gba.rs

@@ -29,8 +29,9 @@ impl GameBoyAdvance {
         audio_device: Rc<RefCell<dyn AudioInterface>>,
         input_device: Rc<RefCell<dyn InputInterface>>,
     ) -> GameBoyAdvance {
+        let gpu = Gpu::new(video_device.clone());
         let sound_controller = SoundController::new(audio_device.clone());
-        let io = IoDevices::new(sound_controller);
+        let io = IoDevices::new(gpu, sound_controller);
         GameBoyAdvance {
             cpu: cpu,
             sysbus: Box::new(SysBus::new(io, bios_rom, gamepak)),
@@ -47,13 +48,10 @@ impl GameBoyAdvance {
 
     pub fn frame(&mut self) {
         self.key_poll();
-        while self.sysbus.io.gpu.state != GpuState::VBlank {
+        while self.sysbus.io.gpu.vcount != DISPLAY_HEIGHT {
             self.step();
         }
-        self.video_device
-            .borrow_mut()
-            .render(self.sysbus.io.gpu.get_framebuffer());
-        while self.sysbus.io.gpu.state == GpuState::VBlank {
+        while self.sysbus.io.gpu.vcount == DISPLAY_HEIGHT {
             self.step();
         }
     }

src/core/gpu/mod.rs

@@ -1,7 +1,10 @@
+use std::cell::RefCell;
+use std::rc::Rc;
 use std::fmt;
 
 use super::arm7tdmi::{Addr, Bus};
 use super::*;
+use crate::VideoInterface;
 
 use crate::bitfield::Bit;
 use crate::num::FromPrimitive;
@@ -143,8 +146,12 @@ pub struct BgAffine {
     pub y: i32,
 }
 
+type VideoDeviceRcRefCell = Rc<RefCell<dyn VideoInterface>>;
+
 #[derive(DebugStub)]
 pub struct Gpu {
+    #[debug_stub = "video handle"]
+    video_device: VideoDeviceRcRefCell,
     pub state: GpuState,
     cycles: usize,
 
@@ -174,8 +181,10 @@ pub struct Gpu {
 }
 
 impl Gpu {
-    pub fn new() -> Gpu {
+    pub fn new(video_device: VideoDeviceRcRefCell) -> Gpu {
         Gpu {
+            video_device: video_device,
+
             dispcnt: DisplayControl(0x80),
             dispstat: DisplayStatus(0),
             bg: [Background::default(); 4],
@@ -443,6 +452,7 @@ impl Gpu {
                             irqs.set_LCD_VBlank(true);
                         };
                         sb.io.dmac.notify_vblank();
+                        self.video_device.borrow_mut().render(&self.frame_buffer);
                     }
                 }
             }

src/core/iodev.rs

@@ -32,9 +32,9 @@ pub struct IoDevices {
 }
 
 impl IoDevices {
-    pub fn new(sound_controller: SoundController) -> IoDevices {
+    pub fn new(gpu: Gpu, sound_controller: SoundController) -> IoDevices {
         IoDevices {
-            gpu: Gpu::new(),
+            gpu: gpu,
             sound: sound_controller,
             timers: Timers::new(),
             dmac: DmaController::new(),