From e08895d35dc170314b28c2d14e99871b01416950 Mon Sep 17 00:00:00 2001
From: Tiger <tiger@stargazer-developments.com>
Date: Sun, 10 Sep 2023 09:54:54 +0200
Subject: [PATCH] Implemented 0x4XKK and 0x5XY0

---
 include/instruction_handler.h | 10 ++++++++++
 src/instruction_handler.cpp   | 27 +++++++++++++++++++++++++++
 2 files changed, 37 insertions(+)

diff --git a/include/instruction_handler.h b/include/instruction_handler.h
index af82804..200f3dc 100644
--- a/include/instruction_handler.h
+++ b/include/instruction_handler.h
@@ -39,6 +39,16 @@ private:
      * Handles Chip8 instruction 0x3000
      */
     static void handle3000(Chip8&, Instruction);
+
+    /**
+     * Handles Chip8 instruction 0x4000
+     */
+    static void handle4000(Chip8&, Instruction);
+
+    /**
+     * Handles Chip8 instruction 0x5000
+     */
+    static void handle5000(Chip8&, Instruction);
 public:
     InstructionHandler();
 
diff --git a/src/instruction_handler.cpp b/src/instruction_handler.cpp
index 4a27605..eb29375 100644
--- a/src/instruction_handler.cpp
+++ b/src/instruction_handler.cpp
@@ -6,6 +6,7 @@ InstructionHandler::InstructionHandler() {
     this->handlers[0x1000] = handle1000;
     this->handlers[0x2000] = handle2000;
     this->handlers[0x3000] = handle3000;
+    this->handlers[0x4000] = handle4000;
 }
 
 /**
@@ -81,4 +82,30 @@ void InstructionHandler::handle3000(Chip8& chip8, Instruction instruction) {
     if (chip8.getRegister(instruction.x()) == instruction.kk()) {
         chip8.setProgramCounter(chip8.getProgramCounter() + 2);
     }
+}
+
+/**
+ * Handles the 0x4XKK Chip8 instruction which is used to skip the next instruction if V[x] != kk.
+ * This will compare V[x] to kk and increases the program counter by 2 if they are not equal.
+ *
+ * @param chip8 The Chip8 instance
+ * @param instruction The Instruction instance
+ */
+void InstructionHandler::handle4000(Chip8& chip8, Instruction instruction) {
+    if (chip8.getRegister(instruction.x()) != instruction.kk()) {
+        chip8.setProgramCounter(chip8.getProgramCounter() + 2);
+    }
+}
+
+/**
+ * Handles the 0x5XY0 Chip8 instruction which is used to skip the next instruction if V[x] == V[y].
+ * This will compare V[x] to V[y] and increases the program counter by 2 if they are equal.
+ *
+ * @param chip8 The Chip8 instance
+ * @param instruction The Instruction instance
+ */
+void InstructionHandler::handle5000(Chip8& chip8, Instruction instruction) {
+    if (chip8.getRegister(instruction.x()) == chip8.getRegister(instruction.y())) {
+        chip8.setProgramCounter(chip8.getProgramCounter() + 2);
+    }
 }
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