core: bus: Change read_x methods of Bus trait to take &mut self

Former-commit-id: ee95b949585420e1daf95ea50939b1a8c9b77349
Former-commit-id: 651203037284fc46eb669cd0e40dc2ebd85bd96b

core/src/bus.rs

@@ -1,20 +1,20 @@
 pub type Addr = u32;
 
 pub trait Bus {
-    fn read_32(&self, addr: Addr) -> u32 {
+    fn read_32(&mut self, addr: Addr) -> u32 {
         self.read_16(addr) as u32 | (self.read_16(addr + 2) as u32) << 16
     }
 
-    fn read_16(&self, addr: Addr) -> u16 {
+    fn read_16(&mut self, addr: Addr) -> u16 {
         self.default_read_16(addr)
     }
 
     #[inline(always)]
-    fn default_read_16(&self, addr: Addr) -> u16 {
+    fn default_read_16(&mut self, addr: Addr) -> u16 {
         self.read_8(addr) as u16 | (self.read_8(addr + 1) as u16) << 8
     }
 
-    fn read_8(&self, addr: Addr) -> u8;
+    fn read_8(&mut self, addr: Addr) -> u8;
 
     fn write_32(&mut self, addr: Addr, value: u32) {
         self.write_16(addr, (value & 0xffff) as u16);
@@ -33,7 +33,7 @@ pub trait Bus {
 
     fn write_8(&mut self, addr: Addr, value: u8);
 
-    fn get_bytes(&self, range: std::ops::Range<u32>) -> Vec<u8> {
+    fn get_bytes(&mut self, range: std::ops::Range<u32>) -> Vec<u8> {
         let mut bytes = Vec::new();
         for b in range {
             bytes.push(self.read_8(b));
@@ -44,17 +44,17 @@ pub trait Bus {
 
 /// Helper trait for reading memory as if we were an all-powerfull debugger
 pub trait DebugRead: Bus {
-    fn debug_read_32(&self, addr: Addr) -> u32 {
+    fn debug_read_32(&mut self, addr: Addr) -> u32 {
         self.debug_read_16(addr) as u32 | (self.debug_read_16(addr + 2) as u32) << 16
     }
 
-    fn debug_read_16(&self, addr: Addr) -> u16 {
+    fn debug_read_16(&mut self, addr: Addr) -> u16 {
         self.debug_read_8(addr) as u16 | (self.debug_read_8(addr + 1) as u16) << 8
     }
 
-    fn debug_read_8(&self, addr: Addr) -> u8;
+    fn debug_read_8(&mut self, addr: Addr) -> u8;
 
-    fn debug_get_bytes(&self, range: std::ops::Range<u32>) -> Vec<u8> {
+    fn debug_get_bytes(&mut self, range: std::ops::Range<u32>) -> Vec<u8> {
         let mut bytes = Vec::new();
         for b in range {
             bytes.push(self.debug_read_8(b));

core/src/cartridge/mod.rs

@@ -64,7 +64,7 @@ impl Cartridge {
         &self.bytes
     }
 
-    // 'clones' the cartridge without the ROM buffer
+    // 'Clones' the cartridge without the ROM buffer
     pub fn thin_copy(&self) -> Cartridge {
         Cartridge {
             header: self.header.clone(),
@@ -96,7 +96,7 @@ fn is_gpio_access(addr: u32) -> bool {
 }
 
 impl Bus for Cartridge {
-    fn read_8(&self, addr: Addr) -> u8 {
+    fn read_8(&mut self, addr: Addr) -> u8 {
         let offset = (addr & 0x01ff_ffff) as usize;
         match addr & 0xff000000 {
             SRAM_LO | SRAM_HI => match &self.backup {
@@ -114,7 +114,7 @@ impl Bus for Cartridge {
         }
     }
 
-    fn read_16(&self, addr: u32) -> u16 {
+    fn read_16(&mut self, addr: u32) -> u16 {
         if is_gpio_access(addr) {
             if let Some(gpio) = &self.gpio {
                 if !(gpio.is_readable()) {
@@ -165,7 +165,7 @@ impl Bus for Cartridge {
 }
 
 impl DebugRead for Cartridge {
-    fn debug_read_8(&self, addr: Addr) -> u8 {
+    fn debug_read_8(&mut self, addr: Addr) -> u8 {
         let offset = (addr & 0x01ff_ffff) as usize;
         self.bytes[offset]
     }

core/src/gpu/mod.rs

@@ -298,7 +298,7 @@ impl Gpu {
     }
 
     /// helper method that reads the palette index from a base address and x + y
-    pub fn read_pixel_index(&self, addr: u32, x: u32, y: u32, format: PixelFormat) -> usize {
+    pub fn read_pixel_index(&mut self, addr: u32, x: u32, y: u32, format: PixelFormat) -> usize {
         match format {
             PixelFormat::BPP4 => self.read_pixel_index_bpp4(addr, x, y),
             PixelFormat::BPP8 => self.read_pixel_index_bpp8(addr, x, y),
@@ -306,7 +306,7 @@ impl Gpu {
     }
 
     #[inline]
-    pub fn read_pixel_index_bpp4(&self, addr: u32, x: u32, y: u32) -> usize {
+    pub fn read_pixel_index_bpp4(&mut self, addr: u32, x: u32, y: u32) -> usize {
         let ofs = addr + index2d!(u32, x / 2, y, 4);
         let ofs = ofs as usize;
         let byte = self.vram.read_8(ofs as u32);
@@ -318,13 +318,13 @@ impl Gpu {
     }
 
     #[inline]
-    pub fn read_pixel_index_bpp8(&self, addr: u32, x: u32, y: u32) -> usize {
+    pub fn read_pixel_index_bpp8(&mut self, addr: u32, x: u32, y: u32) -> usize {
         let ofs = addr;
         self.vram.read_8(ofs + index2d!(u32, x, y, 8)) as usize
     }
 
     #[inline(always)]
-    pub fn get_palette_color(&self, index: u32, palette_bank: u32, offset: u32) -> Rgb15 {
+    pub fn get_palette_color(&mut self, index: u32, palette_bank: u32, offset: u32) -> Rgb15 {
         if index == 0 || (palette_bank != 0 && index % 16 == 0) {
             return Rgb15::TRANSPARENT;
         }
@@ -659,7 +659,7 @@ impl Gpu {
 }
 
 impl Bus for Gpu {
-    fn read_8(&self, addr: Addr) -> u8 {
+    fn read_8(&mut self, addr: Addr) -> u8 {
         let page = (addr >> 24) as usize;
         match page {
             PAGE_PALRAM => self.palette_ram.read_8(addr & 0x3ff),
@@ -716,7 +716,7 @@ impl Bus for Gpu {
 }
 
 impl DebugRead for Gpu {
-    fn debug_read_8(&self, addr: Addr) -> u8 {
+    fn debug_read_8(&mut self, addr: Addr) -> u8 {
         let page = (addr >> 24) as usize;
         match page {
             PAGE_PALRAM => self.palette_ram.read_8(addr & 0x3ff),

core/src/gpu/render/obj.rs

@@ -55,7 +55,7 @@ impl ObjAttrs {
 }
 
 impl Gpu {
-    fn get_affine_matrix(&self, affine_index: u32) -> AffineMatrix {
+    fn get_affine_matrix(&mut self, affine_index: u32) -> AffineMatrix {
         let mut offset = AFFINE_FILL + affine_index * 16 * 2;
         let pa = self.oam.read_16(offset) as i16 as i32;
         offset += 2 + AFFINE_FILL;
@@ -68,7 +68,7 @@ impl Gpu {
         AffineMatrix { pa, pb, pc, pd }
     }
 
-    fn read_obj_attrs(&self, obj: usize) -> ObjAttrs {
+    fn read_obj_attrs(&mut self, obj: usize) -> ObjAttrs {
         let addr = ATTRS_SIZE * (obj as u32);
         let attr0 = Attribute0(self.oam.read_16(addr + 0));
         let attr1 = Attribute1(self.oam.read_16(addr + 2));

core/src/gpu/render/text.rs

@@ -124,16 +124,13 @@ impl Gpu {
             let tile_index = self.vram.read_8(map_addr) as u32;
             let tile_addr = char_block + tile_index * 0x40;
 
-            let color = self.get_palette_color(
-                self.read_pixel_index(
-                    tile_addr,
-                    (t.0 % 8) as u32,
-                    (t.1 % 8) as u32,
-                    PixelFormat::BPP8,
-                ) as u32,
-                0,
-                0,
-            );
+            let pixel_index = self.read_pixel_index(
+                tile_addr,
+                (t.0 % 8) as u32,
+                (t.1 % 8) as u32,
+                PixelFormat::BPP8,
+            ) as u32;
+            let color = self.get_palette_color(pixel_index, 0, 0);
             self.backgrounds[bg].line[screen_x as usize] = color;
         }
     }

core/src/gpu/sfx.rs

@@ -59,7 +59,7 @@ impl Gpu {
     }
 
     #[allow(unused)]
-    fn layer_to_pixel(&self, x: usize, y: usize, layer: &RenderLayer) -> Rgb15 {
+    fn layer_to_pixel(&mut self, x: usize, y: usize, layer: &RenderLayer) -> Rgb15 {
         match layer.kind {
             RenderLayerKind::Background0 => self.backgrounds[0].line[x],
             RenderLayerKind::Background1 => self.backgrounds[1].line[x],

core/src/iodev.rs

@@ -78,7 +78,7 @@ impl InterruptConnect for IoDevices {
 }
 
 impl Bus for IoDevices {
-    fn read_16(&self, addr: Addr) -> u16 {
+    fn read_16(&mut self, addr: Addr) -> u16 {
         let io = self;
         let io_addr = addr + IO_BASE;
         if addr > 0x0800 {
@@ -134,7 +134,7 @@ impl Bus for IoDevices {
         }
     }
 
-    fn read_8(&self, addr: Addr) -> u8 {
+    fn read_8(&mut self, addr: Addr) -> u8 {
         let t = self.read_16(addr & !1);
         if addr & 1 != 0 {
             (t >> 8) as u8
@@ -300,7 +300,7 @@ impl Bus for IoDevices {
 }
 
 impl DebugRead for IoDevices {
-    fn debug_read_8(&self, addr: Addr) -> u8 {
+    fn debug_read_8(&mut self, addr: Addr) -> u8 {
         self.read_8(addr)
     }
 }

core/src/sysbus.rs

@@ -288,7 +288,8 @@ impl SysBus {
 }
 
 impl Bus for SysBus {
-    fn read_32(&self, addr: Addr) -> u32 {
+    #[inline]
+    fn read_32(&mut self, addr: Addr) -> u32 {
         match addr & 0xff000000 {
             BIOS_ADDR => self.bios.read_32(addr),
             EWRAM_ADDR => self.onboard_work_ram.read_32(addr & 0x3_fffc),
@@ -314,7 +315,8 @@ impl Bus for SysBus {
         }
     }
 
-    fn read_16(&self, addr: Addr) -> u16 {
+    #[inline]
+    fn read_16(&mut self, addr: Addr) -> u16 {
         match addr & 0xff000000 {
             BIOS_ADDR => self.bios.read_16(addr),
             EWRAM_ADDR => self.onboard_work_ram.read_16(addr & 0x3_fffe),
@@ -340,7 +342,8 @@ impl Bus for SysBus {
         }
     }
 
-    fn read_8(&self, addr: Addr) -> u8 {
+    #[inline]
+    fn read_8(&mut self, addr: Addr) -> u8 {
         match addr & 0xff000000 {
             BIOS_ADDR => self.bios.read_8(addr),
             EWRAM_ADDR => self.onboard_work_ram.read_8(addr & 0x3_ffff),
@@ -366,6 +369,7 @@ impl Bus for SysBus {
         }
     }
 
+    #[inline]
     fn write_32(&mut self, addr: Addr, value: u32) {
         match addr & 0xff000000 {
             BIOS_ADDR => {}
@@ -390,6 +394,7 @@ impl Bus for SysBus {
         }
     }
 
+    #[inline]
     fn write_16(&mut self, addr: Addr, value: u16) {
         match addr & 0xff000000 {
             BIOS_ADDR => {}
@@ -414,6 +419,7 @@ impl Bus for SysBus {
         }
     }
 
+    #[inline]
     fn write_8(&mut self, addr: Addr, value: u8) {
         match addr & 0xff000000 {
             BIOS_ADDR => {}
@@ -440,7 +446,7 @@ impl Bus for SysBus {
 }
 
 impl DebugRead for SysBus {
-    fn debug_read_8(&self, addr: Addr) -> u8 {
+    fn debug_read_8(&mut self, addr: Addr) -> u8 {
         match addr & 0xff000000 {
             BIOS_ADDR => self.bios.debug_read_8(addr),
             EWRAM_ADDR => self.onboard_work_ram.debug_read_8(addr & 0x3_ffff),

core/src/util.rs

@@ -274,7 +274,7 @@ impl BoxedMemory {
 }
 
 impl Bus for BoxedMemory {
-    fn read_8(&self, addr: Addr) -> u8 {
+    fn read_8(&mut self, addr: Addr) -> u8 {
         unsafe { *self.mem.get_unchecked(addr as usize) }
     }
 
@@ -286,7 +286,7 @@ impl Bus for BoxedMemory {
 }
 
 impl DebugRead for BoxedMemory {
-    fn debug_read_8(&self, addr: Addr) -> u8 {
+    fn debug_read_8(&mut self, addr: Addr) -> u8 {
         self.mem[addr as usize]
     }
 }