commit 1330705f656258baa1b66d240e18e73f0a38165d
from: Witcher01 <witcher01+github@posteo.net>
date: Sun Aug  1 17:04:21 2021 UTC

instantiate stack with 0 length but 16 capacity, removing stack pointer

commit - ebf97be247eb7e27b2df1adf663ae48c9accd391
commit + 1330705f656258baa1b66d240e18e73f0a38165d
blob - a354d0166c46432769fc74e545d7a6bde293d80b
blob + fbf9504c5f31fd5faa20fdb5b342632d1ba86825
--- src/chip8.rs
+++ src/chip8.rs
@@ -19,8 +19,6 @@ pub struct Chip8 {
     pc: u16,
     /// Call stack with a maximum size of 16.
     stack: Vec<u16>,
-    /// Stack pointer, pointing to the topmost level of the stack.
-    stack_pointer: u8,
     /// Delay timer
     /// The value of timer is being decremented at a rate of 60Hz.
     delay_timer: u8,
@@ -38,8 +36,7 @@ impl Chip8 {
             regs: vec![0; 16],
             i_reg: 0,
             pc: PROGRAM_START,
-            stack: vec![0; 16],
-            stack_pointer: 0,
+            stack: Vec::with_capacity(16),
             delay_timer: 0,
             sound_timer: 0,
             video_driver: VideoDriver::new(),