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This commit is contained in:
Robert 2021-07-12 05:26:38 +02:00
parent 54d6fc8c1e
commit ad4eafa882
9 changed files with 122 additions and 71 deletions
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32
include/bus.hpp
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@ -7,6 +7,13 @@
#include "lcd.hpp"
#include "rom.hpp"
// Why is this typedef? Lol
// This was originally a C project believe it or not. I thought getting
// this tiny performance increase was worth the trouble, but I guess that
// eventually I ran into a problem that couldn't be easily solved in less
// than 5 lines of C code. At least I thought so, but anyways, I decided
// to rewrite the emulator in C++, that's why all this code looks so
// fucked up and messy.
typedef union
{
BYTE b;
@ -18,6 +25,9 @@ typedef union
} w;
} TimerControl;
// JoypadReg = The register in the gameboy
// Joypad = A struct to keep the physical keyboard input
typedef union
{
BYTE b;
@ -38,32 +48,37 @@ struct Joypad
bool a, b, up, down, left, right, start, select;
};
// The Bus class contains all the stuff that I didn't know where else to put
class Bus
{
public:
Bus();
~Bus();
// Used to conn
void AttachCPU(CPU& cpu);
void AttachLCD(LCD& lcd);
void InsertROM(ROM& rom);
bool Tick();
bool Execute();
bool Frame();
bool Tick(); // Execute ONE machine cycle (why would you do that lol)
bool Execute(); // Execute ONE CPU instruction (better but still why)
bool Frame(); // Execute CPU instructions until we rendered one full frame (there we go)
BYTE Read(WORD addr);
void Write(WORD addr, BYTE val);
BYTE Fetch(WORD addr);
BYTE Read(WORD addr); // Read from the bus
void Write(WORD addr, BYTE val); // Write to the bus
BYTE Fetch(WORD addr); // This is literally the same as Read(). Like literally. the. exact. same.
// But I use it a lot in the CPU class so I'm too lazy/afraid to remove it
private:
BYTE& GetReference(WORD addr);
BYTE& GetReference(WORD addr); // Leftovers of a really really really bad idea, but again it's used in a few places so I'm too scared to remove it
public:
// Connected devices
ROM* rom;
CPU* cpu;
LCD* lcd;
// These are I/O registers :)
BYTE invalid;
BYTE div;
BYTE tima;
@ -75,7 +90,6 @@ public:
Joypad joypad;
// std::array<BYTE, 0x2000> vram;
std::array<BYTE, 0x2000> wram;
std::array<BYTE, 0x80> hram;
std::array<BYTE, 0x80> hram; // <-- This should be in the CPU class but who cares
};