From 8622df3bc001dea6acca1de3aa5d4cfb5bcecb16 Mon Sep 17 00:00:00 2001
From: Toni <antpiasecki@gmail.com>
Date: Fri, 11 Jul 2025 18:12:58 +0200
Subject: [PATCH] move to raylib

---
 build.sh |  2 +-
 chip8.c  | 42 +++++++++++++++++++++++-------------------
 2 files changed, 24 insertions(+), 20 deletions(-)

diff --git a/build.sh b/build.sh
index 429541b..405fcb8 100755
--- a/build.sh
+++ b/build.sh
@@ -1,3 +1,3 @@
 #!/bin/bash
 set -xe
-cc -O3 -o chip8 chip8.c -lSDL2
\ No newline at end of file
+cc -O3 -o chip8 chip8.c -L/usr/local/lib/libraylib.a -lraylib -lm
\ No newline at end of file
diff --git a/chip8.c b/chip8.c
index 61d6431..6dc6569 100644
--- a/chip8.c
+++ b/chip8.c
@@ -1,8 +1,11 @@
 // http://devernay.free.fr/hacks/chip8/C8TECH10.HTM
-#include <SDL2/SDL.h>
+// TODO: keyboard
+// TODO: buzzer
+#include <raylib.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 
 #define READ_INS()                                                             \
   uint8_t low = c->memory[c->pc++];                                            \
@@ -200,6 +203,13 @@ void chip8_disassemble(CHIP8 *c, size_t ins_count) {
 
 void chip8_step(CHIP8 *c) {
   do {
+    if (c->delay_timer > 0) {
+      c->delay_timer--;
+    }
+    if (c->sound_timer > 0) {
+      c->sound_timer--;
+    }
+
     READ_INS();
 
     switch ((ins >> 12) & 0xF) {
@@ -213,7 +223,9 @@ void chip8_step(CHIP8 *c) {
         c->sp--;
         break;
       default:
-        c->pc = nnn;
+        // >This instruction is only used on the old computers on which Chip-8
+        // >was originally implemented. It is ignored by modern interpreters.
+        break;
       }
     } break;
     case 0x1: {
@@ -394,33 +406,25 @@ int main(int argc, char *argv[]) {
     c.memory[0x200 + i] = buffer[i];
   }
 
-  SDL_Init(SDL_INIT_VIDEO);
-  SDL_Window *window =
-      SDL_CreateWindow("CHIP-8", SDL_WINDOWPOS_UNDEFINED,
-                       SDL_WINDOWPOS_UNDEFINED, 640, 320, SDL_WINDOW_SHOWN);
-  SDL_Surface *surface = SDL_GetWindowSurface(window);
+  InitWindow(640, 320, "CHIP-8");
+  SetTargetFPS(60);
 
-  while (1) {
-    SDL_Event e;
-    while (SDL_PollEvent(&e)) {
-      if (e.type == SDL_QUIT) {
-        return 0;
-      }
+  while (!WindowShouldClose()) {
+    for (int i = 0; i < 25; i++) {
+      chip8_step(&c);
     }
 
-    chip8_step(&c);
+    BeginDrawing();
 
-    SDL_FillRect(surface, NULL, SDL_MapRGB(surface->format, 0xFF, 0xFF, 0xFF));
+    ClearBackground(WHITE);
     for (size_t y = 0; y < 32; y++) {
       for (size_t x = 0; x < 64; x++) {
         if (c.display[x + y * 64] == 1) {
-          SDL_Rect rect = {x * 10, y * 10, 10, 10};
-          SDL_FillRect(surface, &rect,
-                       SDL_MapRGB(surface->format, 0x00, 0x00, 0x00));
+          DrawRectangle(x * 10, y * 10, 10, 10, BLACK);
         }
       }
     }
 
-    SDL_UpdateWindowSurface(window);
+    EndDrawing();
   }
 }
\ No newline at end of file