sigonasr2/CHIP8Emulator
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Added stack display

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Co-authored-by: sigonasr2 <sigonasr2@gmail.com>
This commit is contained in:
sigonasr2 2023-01-08 15:52:33 -06:00
parent d6723d8db8
commit 27e6ab0d27
2 changed files with 74 additions and 17 deletions
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main.cpp
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@ -53,7 +53,7 @@ public:
};
std::array<bool,2048>display;
std::array<uint8_t,2048>screen;
std::stack<uint8_t>stack;
std::list<uint8_t>stack;
float pulse=0;
uint8_t delay_timer,sound_timer;
uint16_t pc=0x200;
@ -65,6 +65,7 @@ public:
std::array<Key,16>keymap{X,K1,K2,K3,Q,W,E,A,S,D,Z,C,K4,R,F,V};
bool USE_ORIGINAL_CHIP8_SET=true; //True means use the original CHIP-8 spec (COSMAC VIP emulation). Set to false to use CHIP-48 spec.
bool PAUSED=true;
long instructionCount=0;
std::string Display8(int number){
std::bitset<8>numb(number);
@ -75,6 +76,14 @@ public:
return numb.to_string();
}
void advanceTimers(){
if (delay_timer>0){
delay_timer--;
}
if (sound_timer>0){
sound_timer--;
}
}
bool OnUserCreate() override
{
@ -112,12 +121,7 @@ public:
if (!USE_DEBUG_DISPLAY||!PAUSED){
pulse+=fElapsedTime;
if (pulse>=1/60.f){
if (delay_timer>0){
delay_timer--;
}
if (sound_timer>0){
sound_timer--;
}
advanceTimers();
pulse-=1/60.f;
for (int i=0;i<10;i++){
@ -128,15 +132,31 @@ public:
} else {
if (GetKey(OEM_6).bPressed){
RunInstruction();
instructionCount++;
if (instructionCount%10==0){
advanceTimers(); //After 10 instructions, 1/60th of a second has passed.
}
DrawDisplay();
} else
if (GetKey(SPACE).bHeld){
RunInstruction();
instructionCount++;
if (instructionCount%10==0){
advanceTimers(); //After 10 instructions, 1/60th of a second has passed.
}
DrawDisplay();
}
}
std::stringstream s;
s<<"PC: 0x"<<std::setfill('0')<< std::setw(4)<<std::hex<<pc;
DrawStringDecal(vi2d{8,EMULATOR_PIXEL_SIZE*EMULATOR_SCREEN_HEIGHT+16},s.str());
std::string ss=s.str();
std::transform(ss.begin()+6,ss.end(),ss.begin()+6,::toupper);
DrawStringDecal(vi2d{8,EMULATOR_PIXEL_SIZE*EMULATOR_SCREEN_HEIGHT+16},ss);
std::stringstream instruction;
instruction<<"0x"<<std::setfill('0')<< std::setw(2)<<std::hex<<(int)memory[pc]<<std::setw(2)<<(int)memory[pc+1];
DrawStringDecal(vi2d{12,EMULATOR_PIXEL_SIZE*EMULATOR_SCREEN_HEIGHT+26},instruction.str());
instruction<<"0x"<<std::setfill('0')<< std::setw(2)<<std::hex<<(int)memory[pc]<<std::setw(2)<<(int)memory[pc+1]<<" "<<GetInstructionDescription(memory[pc]<<8|memory[pc+1]);
ss=instruction.str();
std::transform(ss.begin()+2,ss.end(),ss.begin()+2,::toupper);
DrawStringDecal(vi2d{12,EMULATOR_PIXEL_SIZE*EMULATOR_SCREEN_HEIGHT+26},ss);
for (int i=0;i<21;i++){
uint16_t tmp=pc+(i-10)*2;
@ -144,11 +164,48 @@ public:
std::stringstream tmp_s;
tmp_s<<"0x"<<std::setfill('0')<< std::setw(4)<<std::hex<<tmp<<" "<<std::setw(2)<<(int)memory[tmp]<<std::setw(2)<<(int)memory[tmp+1]<<" "<<GetInstructionDescription(memory[tmp]<<8|memory[tmp+1]);
std::string ss=tmp_s.str();
std::transform(ss.begin(),ss.end(),ss.begin(),::toupper);
std::transform(ss.begin()+2,ss.end(),ss.begin()+2,::toupper);
DrawStringDecal(vi2d{14+EMULATOR_PIXEL_SIZE*EMULATOR_SCREEN_WIDTH,8+i*10},ss,(tmp==pc)?YELLOW:WHITE);
}
}
DrawStringDecal(vi2d{8,EMULATOR_PIXEL_SIZE*EMULATOR_SCREEN_HEIGHT+44},"REG");
for (int i=0;i<16;i++){
std::stringstream s;
s<<"V"+std::to_string(i)<<std::right<<std::setfill(' ')<<std::setw((i>=10)?3:4)<<(int)reg[i];
DrawStringDecal(vi2d{12+i/8*64,EMULATOR_PIXEL_SIZE*EMULATOR_SCREEN_HEIGHT+54+i%8*10},s.str());
}
std::stringstream index_s;
index_s<<"0x"<<std::hex<<std::setfill('0')<<std::setw(4)<<index;
DrawStringDecal(vi2d{8,EMULATOR_PIXEL_SIZE*EMULATOR_SCREEN_HEIGHT+64+10*8},"INDEX: "+index_s.str());
DrawStringDecal(vi2d{8,EMULATOR_PIXEL_SIZE*EMULATOR_SCREEN_HEIGHT+84+10*8},"STACK: ");
int offsetX=0;
bool first=true;
uint8_t prevVal;
bool firstVal=true;
for (uint8_t&val:stack){
if (first) {
first=false;
prevVal=val;
} else {
first=true;
std::stringstream hexStack;
hexStack<<"0x"<<std::hex<<std::setfill('0')<<std::setw(4)<<(val<<8|prevVal);
std::string ss=hexStack.str();
std::transform(ss.begin()+2,ss.end(),ss.begin()+2,::toupper);
DrawStringDecal(vi2d{12+offsetX,EMULATOR_PIXEL_SIZE*EMULATOR_SCREEN_HEIGHT+94+10*8},((!firstVal)?" <- ":"")+ss);
if (firstVal){
offsetX+=6*8;
} else {
offsetX+=10*8;
}
firstVal=false;
}
}
return true;
}
@ -349,10 +406,10 @@ public:
}break;
case 0x0EE:{ //Return from subroutine.
uint8_t byte1,byte2;
byte1=stack.top();
stack.pop();
byte2=stack.top();
stack.pop();
byte1=stack.front();
stack.pop_front();
byte2=stack.front();
stack.pop_front();
pc=byte2<<8|byte1;
//std::cout<<"Exiting subroutine to 0x"<<std::hex<<pc<<std::endl;
}break;
@ -362,8 +419,8 @@ public:
pc=NNN;
}break;
case 0x2:{ //calls the subroutine at memory location NNN
stack.push(pc>>8);
stack.push(pc&0xFF);
stack.push_front(pc>>8);
stack.push_front(pc&0xFF);
//std::cout<<"Pushed 0x"<<std::hex<<pc<<" onto stack"<<std::endl;
pc=NNN;
//std::cout<<"Entering subroutine @ 0x"<<std::hex<<NNN<<std::endl;