Finishing Program Flow Operations

sources/APU/Operand.cpp

@@ -0,0 +1,59 @@
+//
+// Created by Melefo on 24/02/2020.
+//
+
+#include "../Models/Int24.hpp"
+#include "APU.hpp"
+
+namespace ComSquare::APU
+{
+	uint8_t APU::_getDirectValue()
+	{
+		return this->_internalRead(this->_internalRegisters.pc++);
+	}
+
+	uint24_t APU::_getDirectAddr()
+	{
+		uint24_t addr = this->_getDirectValue();
+
+		if (this->_internalRegisters.p)
+			addr += 0x100;
+		return addr;
+	}
+
+	uint24_t APU::_getDirectAddrByX()
+	{
+		uint24_t addr = this->_getDirectAddr();
+
+		addr += this->_internalRegisters.x;
+		return addr;
+	}
+
+	uint24_t APU::_getAbsoluteAddr()
+	{
+		uint24_t addr1 = this->_getDirectValue();
+		uint24_t addr2 = this->_getDirectValue();
+
+		return (addr2 << 8u) | addr1;
+	}
+
+	uint24_t APU::_getAbsoluteAddrByX()
+	{
+		uint24_t addr1 = this->_getDirectValue() + this->_internalRegisters.x;
+		uint24_t addr2 = this->_getDirectValue() + this->_internalRegisters.x++;
+
+		return (addr2 << 8u) | addr1;
+	}
+
+	std::pair<uint24_t, uint24_t> APU::_getAbsoluteBit()
+	{
+		uint24_t addr1 = _getDirectValue();
+		uint24_t addr2 = this->_getDirectValue();
+
+		uint24_t operandA = (addr2 << 8u) | addr1;
+		uint24_t operandB = operandA >> 13u;
+
+		operandA = operandA & 0x1FFFu;
+		return std::make_pair(operandA, operandB);
+	}
+}