Pixel write

src/device/video_sdl2.rs

@@ -1,3 +1,5 @@
+use std::{cell::RefCell, rc::Rc};
+
 use crate::{
     device::{Device, DeviceError},
     vm::Uxn,
@@ -26,13 +28,14 @@ pub struct Sdl2VideoDevice {
     pixels: Vec<u32>,
     width: u16,
     height: u16,
-    fg: Layer,
-    bg: Layer,
-    mono: u8,
+    fg: Rc<RefCell<Layer>>,
+    bg: Rc<RefCell<Layer>>,
+    mono: bool,
 
     x_cur: u16,       // x8, x9
     y_cur: u16,       // xa, xb
-    auto: bool,       // x6
+    auto_x: bool,     // x6
+    auto_y: bool,     // x6
     sprite_addr: u16, // xc, xd
 }
 
@@ -42,10 +45,17 @@ impl Sdl2VideoDevice {
     }
 
     fn clear(&mut self) {
-        for i in 0..(self.width * self.height) as usize {
-            // FIXME: Is there some clear/set operation on vector? You can write your own seemingly, but it's this loop.
-            self.fg.pixels[i] = 0x00;
-            self.bg.pixels[i] = 0x00;
+        {
+            let fg = self.fg.borrow_mut();
+            for i in 0..(self.width * self.height) as usize {
+                fg.pixels[i] = 0x00;
+            }
+        }
+        {
+            let bg = self.bg.borrow_mut();
+            for i in 0..(self.width * self.height) as usize {
+                bg.pixels[i] = 0x00;
+            }
         }
     }
 
@@ -53,7 +63,11 @@ impl Sdl2VideoDevice {
      * Update an entry in either the foreground or background buffers, marking the buffer as dirty.
      */
     fn write_pixel(&mut self, layer: bool, x: u16, y: u16, color: u8) {
-        let layer = if layer { &mut self.fg } else { &mut self.bg };
+        let layer = if layer {
+            self.fg.borrow_mut()
+        } else {
+            self.bg.borrow_mut()
+        };
         if x < self.width && y < self.height {
             let idx = (x + (y * self.height)) as usize;
             if color != layer.pixels[idx] {
@@ -121,8 +135,8 @@ impl Sdl2VideoDevice {
         }
 
         // Both layers are now dirty
-        self.fg.changed |= true;
-        self.bg.changed |= true;
+        self.fg.borrow_mut().changed |= true;
+        self.bg.borrow_mut().changed |= true;
     }
 
     fn redraw(&mut self) {
@@ -132,22 +146,36 @@ impl Sdl2VideoDevice {
             let idx = if (i >> 2) != 0 { i >> 2 } else { i & 3 };
             palette[i] = self.palette[idx];
         }
-        if self.mono != 0 {
+        if self.mono {
             for i in 0..size as usize {
-                let idx = (if self.fg.pixels[i] != 0 {
-                    self.fg.pixels[i]
+                let idx = (if self.fg.borrow().pixels[i] != 0 {
+                    self.fg.borrow().pixels[i]
                 } else {
-                    self.bg.pixels[i]
+                    self.bg.borrow().pixels[i]
                 }) & 0x1;
                 self.pixels[i] = PALETTE_MONO[idx as usize];
             }
         } else {
             for i in 0..size as usize {
-                self.pixels[i] = palette[(self.fg.pixels[i] << 2 | self.bg.pixels[i]) as usize];
+                self.pixels[i] = palette
+                    [(self.fg.borrow().pixels[i] << 2 | self.bg.borrow().pixels[i]) as usize];
             }
         }
-        self.fg.changed = false;
-        self.bg.changed = false;
+        self.fg.borrow_mut().changed = false;
+        self.bg.borrow_mut().changed = false;
+    }
+
+    fn resize(&mut self) {
+        ()
+    }
+
+    fn auto_increment(&mut self, d: u8) {
+        if self.auto_x {
+            self.x_cur += d as u16;
+        }
+        if self.auto_y {
+            self.y_cur += d as u16;
+        }
     }
 }
 
@@ -158,10 +186,21 @@ impl Device for Sdl2VideoDevice {
         match slot {
             0x0 => Ok((self.vector >> 8) as u8),
             0x1 => Ok((self.vector & 0xFF) as u8),
+
             0x2 => Ok((self.width >> 8) as u8),
             0x3 => Ok((self.width & 0xFF) as u8),
+
             0x4 => Ok((self.height >> 8) as u8),
             0x5 => Ok((self.height & 0xFF) as u8),
+
+            0x6 => Ok((if self.auto_y { 1 } else { 0 }) << 1 | (if self.auto_x { 1 } else { 0 })),
+
+            0x8 => Ok((self.x_cur >> 8) as u8),
+            0x9 => Ok((self.x_cur & 0xFF) as u8),
+
+            0xa => Ok((self.y_cur >> 8) as u8),
+            0xb => Ok((self.y_cur & 0xFF) as u8),
+
             _ => Ok(0),
         }
     }
@@ -177,18 +216,40 @@ impl Device for Sdl2VideoDevice {
             0x1 => self.vector = self.vector & 0xFF00 | (val as u16),
             // Writing to the device width port.
             // Note that the reference implementation triggers resizing on the lower byte
-            0x2 | 0x3 => (),
+            0x2 => self.width = self.width & 0x00FF | ((val as u16) << 8),
+            0x3 => {
+                self.width = self.width & 0xFF00 | (val as u16);
+                self.resize();
+            }
             // Writing to the device height port
             // Note that the reference implementation triggers resizing on the lower byte
-            0x4 | 0x5 => (),
+            0x4 => self.height = self.height & 0x00FF | ((val as u16) << 8),
+            0x5 => {
+                self.height = self.height & 0xFF00 | (val as u16);
+                self.resize();
+            }
 
             // FIXME: Writing to all the settings words (auto, x, y, addr)
 
+            // Write the auto word
+            0x6 => {
+                self.auto_x = val & 0x1 != 0;
+                self.auto_y = val & 0x2 != 0;
+            }
+
             // Write a pixel word
-            0xe => (),
+            0xe => {
+                let layer = val & 0x40 != 0;
+                self.write_pixel(layer, self.x_cur, self.y_cur, val & 0x3);
+                self.auto_increment(1);
+            }
 
             // Write a sprite word
-            0xf => (),
+            0xf => {
+                let layer = val & 0x40 != 0;
+                let n = val & 0xF >> 4;
+                self.auto_increment(8); // sprites are always 8x8, although we may do many at once.
+            }
 
             _ => (),
         }