commit 5210a85ad5036c3aff9bbcc757763582d5bea59a
from: Witcher01 <witcher01+github@posteo.net>
date: Sun Aug  1 16:16:22 2021 UTC

basic instruction stuff

commit - 00098d83918691e91c4ecd0f18bd9e542c5ce9a1
commit + 5210a85ad5036c3aff9bbcc757763582d5bea59a
blob - 11a1422a4ad5b4db09bfa55ee568cb7b7a36c4d9
blob + 51185056fdf6742a81bcb84add7490c87fd0d846
--- src/chip8.rs
+++ src/chip8.rs
@@ -1,3 +1,5 @@
+use std::path::Path;
+
 use crate::drivers::VideoDriver;
 
 #[derive(Debug)]
@@ -27,10 +29,14 @@ pub struct Chip8 {
     video_driver: VideoDriver,
 }
 
+#[derive(Debug, Clone)]
 /// Instructions of the Chip8.
 pub enum Instruction {
     /// Clears the screen.
     CLS,
+    /// Default type for empty instruction field.
+    /// This is not an actual instruction.
+    EMPTY,
 }
 
 impl Chip8 {
@@ -55,10 +61,26 @@ impl Chip8 {
             Instruction::CLS => {
                 self.video_driver.clear();
             },
+            _ => {
+                return Err(String::from("unknown instruction"));
+            }
         };
 
         Ok(())
     }
+
+    pub fn run(&mut self, file_path: &Path) -> Result<(), String> {
+        let bytes = std::fs::read(file_path).expect("reading file");
+        let instructions = convert_to_instructions(bytes)?;
+
+        for i in instructions {
+            println!("executing instruction {:?} at line {}", i, self.pc);
+            self.execute(i)?;
+            self.pc = self.pc + 1;
+        }
+
+        Ok(())
+    }
 }
 
 // this makes the code easier to read
@@ -66,11 +88,23 @@ impl Chip8 {
 pub fn raw_to_instruction(instruction: u16) -> Result<Instruction, String> {
     match instruction {
         // CLS
-        0x00E0 => {
-            return Ok(Instruction::CLS)
-        },
+        0x00E0 => return Ok(Instruction::CLS),
         _ => {
             return Err(format!("{:x}: not an instruction", instruction));
         }
     }
 }
+
+fn convert_to_instructions(bytes: Vec<u8>) -> Result<Vec<Instruction>, String> {
+    // since 2 bytes make up 1 instruction this vec only needs to be half as big
+    let mut instructions: Vec<Instruction> = vec![Instruction::EMPTY; bytes.len() / 2];
+
+    let iter = bytes.chunks(2);
+
+    for (i, e) in iter.enumerate() {
+        let t: u16 = (e[0] as u16) << 8 | (e[1] as u16);
+        instructions[i] = raw_to_instruction(t)?;
+    }
+
+    Ok(instructions)
+}
blob - b2d6b056b7cfc8cc73a88825087bab39f390f2a8
blob + 241c01253dc57db35535095597b5d5f28ea2856e
--- src/main.rs
+++ src/main.rs
@@ -4,14 +4,14 @@ mod drivers;
 use chip8::Chip8;
 
 use minifb::{Window, WindowOptions};
+use std::path::Path;
 
 fn main() -> Result<(), String> {
-    let mut w = Window::new("yac8e", 64, 32, WindowOptions::default())
-        .expect("Unable to open a window");
+    let _w =
+        Window::new("yac8e", 64, 32, WindowOptions::default()).expect("Unable to open a window");
 
-    let chip8 = Chip8::new();
+    let mut chip8 = Chip8::new();
+    let file_path = Path::new("test.ch8");
 
-    std::thread::sleep(std::time::Duration::from_secs(1));
-
-    Ok(())
+    chip8.run(&file_path)
 }