General improvements (#10)

* Makefile

* Restart emulation as soon as a ROM is loaded

* upgrade eframe and wgpu

* adjust the tv output image size according to the current snes resolution

* fix bug when loading different roms

snes-core/src/cpu/bus.rs

@@ -35,6 +35,12 @@ impl Bus {
         }
     }
 
+    pub fn hard_reset(&mut self) {
+        self.wram = [0; 0x10000];
+        self.internal_registers = InternalRegisters::new();
+        self.dma = DMA::new();
+    }
+
     fn read_wram(&self, address: u32) -> u8 {
         self.wram[(address & 0xFFFF) as usize]
     }

snes-core/src/emulator.rs

@@ -34,9 +34,15 @@ impl Emulator {
         }
     }
 
-    pub fn reset(&mut self) {
+    pub fn reset_vector(&mut self) {
         self.cpu.reset_vector(&mut self.bus);
     }
+
+    pub fn hard_reset(&mut self) {
+        self.cpu = CPU::new();
+        self.bus.hard_reset();
+        self.reset_vector();
+    }
 }
 
 impl Default for Emulator {

snes-core/src/ppu/interface.rs

@@ -94,6 +94,7 @@ impl PPU {
         // ----
         // possible optimizations:
         // - Fetch all of the necessary data before starting to render the scanline
+        // - Pre-render each background in a framebuffer and only update the framebuffer if either the tileset or charset changes
         let tileset_vram_base_address = self.registers.get_bg_tile_base_address(background) as usize;
         let charset_vram_base_address = self.registers.get_bg_char_base_address(background) as usize;
         let (bg_size_width, _) = self.registers.get_bg_size(background).to_usize();

snes-core/src/rom/lo_rom.rs

@@ -20,6 +20,7 @@ impl LoROM {
 
 impl ROM for LoROM {
     fn load(&mut self, filename: &str) -> std::io::Result<bool> {
+        self.data = vec![];
         load_rom(filename, &mut self.data)
     }