Agregando sonido

algunos programas llaman a ubicaciones impares por alguna razon -.-'

src/CMakeLists.txt

@@ -7,6 +7,8 @@ target_sources(
         main.cpp
         Machine.cpp
         Machine.h
+        Sound.cpp
+        Sound.h
         Graphics/Graphics.cpp
         Graphics/Graphics.h
         Graphics/Color.h
@@ -30,8 +32,12 @@ target_sources(
         UI/UIManager.h
         UI/Disassembler.cpp
         UI/Disassembler.h
+        UI/RegisterView.cpp
+        UI/RegisterView.h
+        UI/StackViewer.cpp
+        UI/StackViewer.h
 )
 
-add_compile_options(-Wall -Wextra -Wpedantic -Werror)
+target_link_libraries(${PROJECT_NAME} PRIVATE vendor)
-
+target_compile_options(${PROJECT_NAME} PRIVATE -Wall -Wextra -Wpedantic -Werror)
-target_link_libraries(${PROJECT_NAME} PRIVATE vendor)
+target_link_options(${PROJECT_NAME} PRIVATE)

src/Graphics/Graphics.cpp

@@ -18,7 +18,7 @@ void Graphics::create_sdl()
 {
     SDL_SetAppMetadata("CHIP-8 Emulator", "0.0.1", "fun.skrd.chip8");
 
-    if (!SDL_Init(SDL_INIT_VIDEO))
+    if (!SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO))
     {
         throw std::runtime_error(std::format("Couldn't initialize SDL: {}", SDL_GetError()));
     }
@@ -96,4 +96,4 @@ void Graphics::end() const
 
     ImGui_ImplSDLRenderer3_RenderDrawData(ImGui::GetDrawData(), this->renderer.get());
     SDL_RenderPresent(this->renderer.get());
-}
+}

src/Interpreter/Interpreter.cpp

@@ -8,6 +8,7 @@ Interpreter::Interpreter(std::shared_ptr<MachineState> machine_state) :
     random_generator{std::random_device{}()}
 {
     srand(time(nullptr));
+    // quirks = static_cast<uint8_t>(InterpreterQuirks::COSMAC_STORE_AND_LOAD);
     for (bool& display : this->machine_state->display)
     {
         display = rand() % 100 > 50;
@@ -219,7 +220,7 @@ std::vector<Instruction> Interpreter::disassembly() const
 {
     std::vector<Instruction> instructions(std::size(machine_state->memory) / 2);
 
-    for (auto address = 0; address < std::size(machine_state->memory); address += 2)
+    for (std::size_t address = 0; address < std::size(machine_state->memory); address += 2)
     {
         const auto word = this->get_word(address);
         instructions[address / 2] = (this->decode(word, address));
@@ -287,6 +288,7 @@ void Interpreter::ret() const
 {
     this->machine_state->sp -= 1;
     this->machine_state->pc = this->machine_state->stack[this->machine_state->sp];
+    this->machine_state->stack[this->machine_state->sp] = 0;
 }
 
 void Interpreter::jp_addr(const Instruction& instruction) const
@@ -332,7 +334,8 @@ void Interpreter::ld_vx_byte(const Instruction& instruction) const
 
 void Interpreter::add_vx_byte(const Instruction& instruction) const
 {
-    this->machine_state->v[instruction.x] += instruction.kk;
+    auto& vx = this->machine_state->v[instruction.x];
+    vx = (vx + instruction.kk) & 0xFF;
 }
 
 void Interpreter::ld_vx_vy(const Instruction& instruction) const
@@ -343,16 +346,19 @@ void Interpreter::ld_vx_vy(const Instruction& instruction) const
 void Interpreter::or_vx_vy(const Instruction& instruction) const
 {
     this->machine_state->v[instruction.x] |= this->machine_state->v[instruction.y];
+    this->machine_state->v[0xF] = 0;
 }
 
 void Interpreter::and_vx_vy(const Instruction& instruction) const
 {
     this->machine_state->v[instruction.x] &= this->machine_state->v[instruction.y];
+    this->machine_state->v[0xF] = 0;
 }
 
 void Interpreter::xor_vx_vy(const Instruction& instruction) const
 {
     this->machine_state->v[instruction.x] ^= this->machine_state->v[instruction.y];
+    this->machine_state->v[0xF] = 0;
 }
 
 void Interpreter::add_vx_vy(const Instruction& instruction) const
@@ -361,16 +367,9 @@ void Interpreter::add_vx_vy(const Instruction& instruction) const
     const auto& vy = this->machine_state->v[instruction.y];
     auto& vf = this->machine_state->v[0xF];
 
-    if (vx + vy > 0xFF)
+    const bool carry = vx + vy > 0x100;
-    {
+    vx = (vx + vy) & 0xFF;
-        vf = 1;
+    vf = carry ? 1 : 0;
-    }
-    else
-    {
-        vf = 0;
-    }
-
-    vx += vy;
 }
 
 void Interpreter::sub_vx_vy(const Instruction& instruction) const
@@ -379,16 +378,9 @@ void Interpreter::sub_vx_vy(const Instruction& instruction) const
     const auto& vy = this->machine_state->v[instruction.y];
     auto& vf = this->machine_state->v[0xF];
 
-    if (vx > vy)
+    const bool carry = vx >= vy;
-    {
+    vx = (vx - vy) & 0xFF;
-        vf = 1;
+    vf = carry ? 1 : 0;
-    }
-    else
-    {
-        vf = 0;
-    }
-
-    vx -= vy;
 }
 
 void Interpreter::shr_vx_vy(const Instruction& instruction) const
@@ -402,16 +394,9 @@ void Interpreter::shr_vx_vy(const Instruction& instruction) const
         vx = vy;
     }
 
-    if (vx & 0x01)
+    const bool carry = vx & 0x01;
-    {
-        vf = 1;
-    }
-    else
-    {
-        vf = 0;
-    }
-
     vx = vx >> 1;
+    vf = carry ? 1 : 0;
 }
 
 void Interpreter::subn_vx_vy(const Instruction& instruction) const
@@ -420,16 +405,9 @@ void Interpreter::subn_vx_vy(const Instruction& instruction) const
     const auto& vy = this->machine_state->v[instruction.y];
     auto& vf = this->machine_state->v[0xF];
 
-    if (vy > vx)
+    const bool carry = vy >= vx;
-    {
+    vx = (vy - vx) & 0xFF;
-        vf = 1;
+    vf = carry ? 1 : 0;
-    }
-    else
-    {
-        vf = 0;
-    }
-
-    vx = vy - vx;
 }
 
 void Interpreter::shl_vx_vy(const Instruction& instruction) const
@@ -443,16 +421,9 @@ void Interpreter::shl_vx_vy(const Instruction& instruction) const
         vx = vy;
     }
 
-    if (vx & 0x80)
+    const bool carry = vx & 0x80;
-    {
+    vx = vx << 1 & 0xFF;
-        vf = 1;
+    vf = carry ? 1 : 0;
-    }
-    else
-    {
-        vf = 0;
-    }
-
-    vx = vx << 1;
 }
 
 void Interpreter::sne_vx_vy(const Instruction& instruction) const
@@ -495,12 +466,13 @@ void Interpreter::drw_vx_vy_nibble(const Instruction& instruction) const
     const auto& vx = this->machine_state->v[instruction.x];
     const auto& vy = this->machine_state->v[instruction.y];
     auto& vf = this->machine_state->v[0xF];
-    auto& i = this->machine_state->i;
+    const auto& i = this->machine_state->i;
 
     const uint8_t start_x = vx & 63;
     const uint8_t start_y = vy & 31;
     vf = 0;
 
+    bool carry = false;
     for (auto row = 0; row < instruction.n; row++)
     {
         const auto current_y = start_y + row;
@@ -529,7 +501,7 @@ void Interpreter::drw_vx_vy_nibble(const Instruction& instruction) const
                 if (display[index])
                 {
                     display[index] = false;
-                    vf = 1;
+                    carry = true;
                 }
                 else
                 {
@@ -538,11 +510,13 @@ void Interpreter::drw_vx_vy_nibble(const Instruction& instruction) const
             }
         }
     }
+
+    vf = carry ? 1 : 0;
 }
 
 void Interpreter::skp_vx(const Instruction& instruction) const
 {
-    if (this->machine_state->keyboard & 1 << instruction.x)
+    if (this->machine_state->keyboard & 1 << this->machine_state->v[instruction.x])
     {
         this->machine_state->pc += 2;
     }
@@ -550,7 +524,7 @@ void Interpreter::skp_vx(const Instruction& instruction) const
 
 void Interpreter::sknp_vx(const Instruction& instruction) const
 {
-    if (!(this->machine_state->keyboard & 1 << instruction.x))
+    if (!(this->machine_state->keyboard & 1 << this->machine_state->v[instruction.x]))
     {
         this->machine_state->pc += 2;
     }
@@ -561,22 +535,39 @@ void Interpreter::ld_vx_dt(const Instruction& instruction) const
     this->machine_state->v[instruction.x] = this->machine_state->dt;
 }
 
-void Interpreter::ld_vx_k(const Instruction& instruction) const
+void Interpreter::ld_vx_k(const Instruction& instruction)
 {
-    if (this->machine_state->keyboard == 0)
+    if (this->machine_state->keyboard == 0 && this->wait_for_key_released == 0)
     {
         this->machine_state->pc -= 2;
         return;
     }
 
-    for (auto key = 0; key < 16; key++)
+    if (this->machine_state->keyboard != 0 && this->wait_for_key_released == 0)
     {
-        if (this->machine_state->keyboard & 1 << key)
+        this->wait_for_key_released = this->machine_state->keyboard;
+        this->machine_state->pc -= 2;
+        return;
+    }
+
+    if (this->wait_for_key_released != 0)
+    {
+        const auto released_keys = this->wait_for_key_released & (~this->machine_state->keyboard);
+        if (released_keys != 0)
         {
-            this->machine_state->v[instruction.x] = key;
+            for (auto key = 0; key < 16; key++)
-            break;
+            {
+                if (released_keys & 1 << key)
+                {
+                    this->machine_state->v[instruction.x] = key;
+                    this->wait_for_key_released = 0;
+                    return;
+                }
+            }
         }
     }
+
+    this->machine_state->pc -= 2;
 }
 
 void Interpreter::ld_dt_vx(const Instruction& instruction) const

src/Interpreter/Interpreter.h

@@ -20,8 +20,8 @@ class Interpreter
     std::mt19937 random_generator;
 
     uint8_t quirks = 0;
+    uint16_t wait_for_key_released = false;
 
-    Instruction decode(uint16_t word, uint16_t address) const;
     void execute_instruction(const Instruction& instruction);
 
     void sys_addr() const;
@@ -52,7 +52,7 @@ class Interpreter
     void skp_vx(const Instruction& instruction) const;
     void sknp_vx(const Instruction& instruction) const;
     void ld_vx_dt(const Instruction& instruction) const;
-    void ld_vx_k(const Instruction& instruction) const;
+    void ld_vx_k(const Instruction& instruction);
     void ld_dt_vx(const Instruction& instruction) const;
     void ld_st_vx(const Instruction& instruction) const;
     void add_i_vx(const Instruction& instruction) const;
@@ -64,6 +64,7 @@ class Interpreter
 public:
     explicit Interpreter(std::shared_ptr<MachineState> machine_state);
     uint16_t get_word(uint16_t address) const;
+    Instruction decode(uint16_t word, uint16_t address) const;
     std::vector<Instruction> disassembly() const;
 
     void tick();

src/Machine.cpp

@@ -16,15 +16,21 @@
 Machine::Machine() :
     machine_state{std::make_shared<MachineState>()},
     graphics{std::make_shared<Graphics>()},
+    sound{std::make_unique<Sound>()},
     callback_manager(std::make_shared<CallbackManager>()),
 
-    interpreter{std::make_unique<Interpreter>(this->machine_state)},
+    interpreter{std::make_shared<Interpreter>(this->machine_state)},
-    ui_manager{std::make_unique<UIManager>(this->graphics, this->machine_state, this->callback_manager)},
+    ui_manager{
-    running{false},
+        std::make_unique<UIManager>(this->graphics, this->machine_state, this->interpreter, this->callback_manager)
+    },
     ips{60},
     last_update_time{0},
     accumulator{0},
-    target_cycle_time{1.0 / this->ips}
+    target_cycle_time{1.0 / this->ips},
+    last_timer_time{0},
+    timer_accumulator{0},
+    timer_cycle_time{1.0 / 60},
+    running{false}
 {
     this->register_callbacks();
     this->callback_manager->trigger(this->callback_manager->ips_callback, this->ips);
@@ -34,11 +40,14 @@ void Machine::iterate()
 {
     if (running)
     {
+        this->update_timers();
         this->execute_interpreter();
     }
 
-    this->callback_manager->trigger(this->callback_manager->disassembly_callback, this->interpreter->disassembly());
+    if (machine_state->st > 0)
-
+    {
+        this->sound->square();
+    }
     this->graphics->start();
     this->ui_manager->render();
     this->graphics->end();
@@ -52,6 +61,94 @@ bool Machine::on_event(const SDL_Event* event) const
     {
         return false;
     }
+    if (event->type == SDL_EVENT_KEY_DOWN || event->type == SDL_EVENT_KEY_UP)
+    {
+        const bool pressed = event->type == SDL_EVENT_KEY_DOWN;
+        switch (event->key.scancode)
+        {
+        case SDL_SCANCODE_1:
+            machine_state->keyboard = pressed
+                                          ? machine_state->keyboard | (1 << 0x1)
+                                          : machine_state->keyboard & ~(1 << 0x1);
+            break;
+        case SDL_SCANCODE_2:
+            machine_state->keyboard = pressed
+                                          ? machine_state->keyboard | (1 << 0x2)
+                                          : machine_state->keyboard & ~(1 << 0x2);
+            break;
+        case SDL_SCANCODE_3:
+            machine_state->keyboard = pressed
+                                          ? machine_state->keyboard | (1 << 0x3)
+                                          : machine_state->keyboard & ~(1 << 0x3);
+            break;
+        case SDL_SCANCODE_4:
+            machine_state->keyboard = pressed
+                                          ? machine_state->keyboard | (1 << 0xC)
+                                          : machine_state->keyboard & ~(1 << 0xC);
+            break;
+        case SDL_SCANCODE_Q:
+            machine_state->keyboard = pressed
+                                          ? machine_state->keyboard | (1 << 0x4)
+                                          : machine_state->keyboard & ~(1 << 0x4);
+            break;
+        case SDL_SCANCODE_W:
+            machine_state->keyboard = pressed
+                                          ? machine_state->keyboard | (1 << 0x5)
+                                          : machine_state->keyboard & ~(1 << 0x5);
+            break;
+        case SDL_SCANCODE_E:
+            machine_state->keyboard = pressed
+                                          ? machine_state->keyboard | (1 << 0x6)
+                                          : machine_state->keyboard & ~(1 << 0x6);
+            break;
+        case SDL_SCANCODE_R:
+            machine_state->keyboard = pressed
+                                          ? machine_state->keyboard | (1 << 0xD)
+                                          : machine_state->keyboard & ~(1 << 0xD);
+            break;
+        case SDL_SCANCODE_A:
+            machine_state->keyboard = pressed
+                                          ? machine_state->keyboard | (1 << 0x7)
+                                          : machine_state->keyboard & ~(1 << 0x7);
+            break;
+        case SDL_SCANCODE_S:
+            machine_state->keyboard = pressed
+                                          ? machine_state->keyboard | (1 << 0x8)
+                                          : machine_state->keyboard & ~(1 << 0x8);
+            break;
+        case SDL_SCANCODE_D:
+            machine_state->keyboard = pressed
+                                          ? machine_state->keyboard | (1 << 0x9)
+                                          : machine_state->keyboard & ~(1 << 0x9);
+            break;
+        case SDL_SCANCODE_F:
+            machine_state->keyboard = pressed
+                                          ? machine_state->keyboard | (1 << 0xE)
+                                          : machine_state->keyboard & ~(1 << 0xE);
+            break;
+        case SDL_SCANCODE_Z:
+            machine_state->keyboard = pressed
+                                          ? machine_state->keyboard | (1 << 0xA)
+                                          : machine_state->keyboard & ~(1 << 0xA);
+            break;
+        case SDL_SCANCODE_X:
+            machine_state->keyboard = pressed
+                                          ? machine_state->keyboard | (1 << 0x0)
+                                          : machine_state->keyboard & ~(1 << 0x0);
+            break;
+        case SDL_SCANCODE_C:
+            machine_state->keyboard = pressed
+                                          ? machine_state->keyboard | (1 << 0xB)
+                                          : machine_state->keyboard & ~(1 << 0xB);
+            break;
+        case SDL_SCANCODE_V:
+            machine_state->keyboard = pressed
+                                          ? machine_state->keyboard | (1 << 0xF)
+                                          : machine_state->keyboard & ~(1 << 0xF);
+            break;
+        default: break;
+        }
+    }
 
     return true;
 }
@@ -70,6 +167,21 @@ void Machine::execute_interpreter()
     }
 }
 
+void Machine::update_timers()
+{
+    const auto current_time = SDL_GetTicks();
+    const auto delta_time = static_cast<double>(current_time - this->last_update_time) / 1000.0;
+    this->last_timer_time = current_time;
+    this->timer_accumulator += delta_time;
+
+    while (this->timer_accumulator >= this->timer_cycle_time)
+    {
+        machine_state->dt = machine_state->dt > 0 ? machine_state->dt - 1 : 0;
+        machine_state->st = machine_state->st > 0 ? machine_state->st - 1 : 0;
+        this->timer_accumulator -= this->timer_cycle_time;
+    }
+}
+
 void Machine::register_callbacks()
 {
     callback_manager->rom_load_callback.push_back(std::bind(

src/Machine.h

@@ -1,6 +1,7 @@
 #ifndef MACHINE_H
 #define MACHINE_H
 
+#include "Sound.h"
 #include "Graphics/Graphics.h"
 #include "Interpreter/Interpreter.h"
 #include "SDL3/SDL_events.h"
@@ -11,9 +12,10 @@ class Machine
 {
     std::shared_ptr<MachineState> machine_state;
     std::shared_ptr<Graphics> graphics;
+    std::unique_ptr<Sound> sound;
     std::shared_ptr<CallbackManager> callback_manager;
 
-    std::unique_ptr<Interpreter> interpreter;
+    std::shared_ptr<Interpreter> interpreter;
     std::unique_ptr<UIManager> ui_manager;
 
     int ips;
@@ -21,10 +23,16 @@ class Machine
     double accumulator;
     double target_cycle_time;
 
+    uint64_t last_timer_time;
+    double timer_accumulator;
+    double timer_cycle_time;
+
     std::string rom;
     bool running;
 
     void execute_interpreter();
+    void update_timers();
+
     void on_rom_load(const std::string& path);
     void on_reset() const;
     void on_stop();

src/Sound.cpp

@@ -0,0 +1,88 @@
+#include "Sound.h"
+
+#include <format>
+
+#include "SDL3/SDL.h"
+
+void SDLAudioStreamDestroyer::operator()(SDL_AudioStream* stream) const
+{
+    SDL_DestroyAudioStream(stream);
+}
+
+Sound::Sound()
+{
+    spec.channels = 1;
+    spec.format = SDL_AUDIO_F32;
+    spec.freq = 8000;
+
+    SDL_AudioStream* raw_stream = SDL_OpenAudioDeviceStream(SDL_AUDIO_DEVICE_DEFAULT_PLAYBACK, &spec, nullptr, nullptr);
+    if (!raw_stream)
+    {
+        throw std::runtime_error(std::format("Couldn't initialize audio stream: {}", SDL_GetError()));
+    }
+
+    stream = std::unique_ptr<SDL_AudioStream, SDLAudioStreamDestroyer>(raw_stream);
+
+
+    SDL_ResumeAudioStreamDevice(stream.get());
+}
+
+void Sound::sine()
+{
+    constexpr int minimum_audio = (8000 * sizeof(float)) / 6;
+    constexpr int freq = 440;
+
+    if (SDL_GetAudioStreamQueued(stream.get()) < minimum_audio)
+    {
+        static float samples[512];
+        for (std::size_t i = 0; i < std::size(samples); i++)
+        {
+            const float phase = current_sine_sample * freq / 8000.0f;
+            samples[i] = SDL_sinf(phase * 2 * SDL_PI_F);
+            current_sine_sample++;
+        }
+
+        current_sine_sample %= 8000;
+
+        SDL_PutAudioStreamData(stream.get(), samples, sizeof (samples));
+    }
+}
+
+void Sound::noise()
+{
+    constexpr int minimum_audio = (8000 * sizeof(float)) / 6;
+    constexpr int freq = 440;
+    if (SDL_GetAudioStreamQueued(stream.get()) < minimum_audio)
+    {
+        static float samples[512];
+
+        for (std::size_t i = 0; i < std::size(samples); i++)
+        {
+            samples[i] = SDL_rand(2) * freq;
+        }
+
+        SDL_PutAudioStreamData(stream.get(), samples, sizeof (samples));
+    }
+}
+
+void Sound::square()
+{
+    constexpr int minimum_audio = (8000 * sizeof(float)) / 6;
+    constexpr int freq = 440;
+    constexpr float amplitude = 0.5f;
+
+    if (SDL_GetAudioStreamQueued(stream.get()) < minimum_audio)
+    {
+        static float samples[512];
+        for (std::size_t i = 0; i < std::size(samples); i++)
+        {
+            const float phase = current_sine_sample * freq / 8000.0f;
+            samples[i] = (SDL_sinf(phase * 2 * SDL_PI_F) >= 0.0f) ? amplitude : -amplitude;
+            current_sine_sample++;
+        }
+
+        current_sine_sample %= 8000;
+
+        SDL_PutAudioStreamData(stream.get(), samples, sizeof(samples));
+    }
+}

src/Sound.h

@@ -0,0 +1,28 @@
+#ifndef SOUND_H
+#define SOUND_H
+#include <memory>
+#include <SDL3/SDL.h>
+
+
+struct SDLAudioStreamDestroyer
+{
+    void operator()(SDL_AudioStream* stream) const;
+};
+
+class Sound
+{
+    SDL_AudioSpec spec;
+    std::unique_ptr<SDL_AudioStream, SDLAudioStreamDestroyer> stream;
+
+    int current_sine_sample = 0;
+
+public:
+    Sound();
+
+    void sine();
+    void noise();
+    void square();
+};
+
+
+#endif //SOUND_H

src/UI/CallbackManager.h

@@ -16,7 +16,6 @@ struct CallbackManager
     std::vector<std::function<void(int)>> step_callback;
     std::vector<std::function<void(int)>> ips_callback;
     std::vector<std::function<void()>> reload_callback;
-    std::vector<std::function<void(const std::vector<Instruction>)>> disassembly_callback;
 
     template <typename Func, typename... Args>
     void trigger(const std::vector<Func>& callbacks, Args&&... args)

src/UI/ControlPanel.cpp

@@ -49,7 +49,7 @@ void ControlPanel::render()
             }
         }
 
-        ImGui::Text("Status: %s", "Stopped");
+        ImGui::Text("Status: %s", run ? "Running" : "Stopped");
 
         ImGui::SeparatorText("Debug");
 
@@ -122,7 +122,7 @@ void ControlPanel::on_click_load_rom()
     );
 }
 
-void ControlPanel::on_callback_load_rom(void* self, const char* const* filelist, int filter)
+void ControlPanel::on_callback_load_rom(void* self, const char* const* filelist, int)
 {
     const auto control_panel = static_cast<ControlPanel*>(self);
 

src/UI/Disassembler.cpp

@@ -9,16 +9,13 @@
 Disassembler::Disassembler(
     std::shared_ptr<Graphics> graphics,
     std::shared_ptr<MachineState> machine_state,
+    std::shared_ptr<Interpreter> interpreter,
     std::shared_ptr<CallbackManager> callback_manager) :
     graphis{std::move(graphics)},
     machine_state{std::move(machine_state)},
+    interpreter{std::move(interpreter)},
     callback_manager{std::move(callback_manager)}
 {
-    this->callback_manager->disassembly_callback.push_back(std::bind(
-        &Disassembler::on_disassembly_callback,
-        this,
-        std::placeholders::_1
-    ));
 }
 
 void Disassembler::render()
@@ -26,39 +23,57 @@ void Disassembler::render()
     if (ImGui::Begin("Chip-8 - Disassembly"))
     {
         ImGui::Checkbox("Follow", &this->follow);
+        ImGui::Checkbox("Show odd instructions", &this->show_odd);
 
         ImGuiListClipper clipper;
-        clipper.Begin(this->disassembly.size());
+        clipper.Begin((machine_state->memory.size() / (this->show_odd ? 1 : 2)) - ((this->show_odd ? 1 : 0)));
         ImGui::BeginChild("##instructions");
 
         if (this->follow)
         {
-            size_t pc_index = machine_state->pc / 2;
             const float line_h = ImGui::GetTextLineHeightWithSpacing();
 
-            if (pc_index < disassembly.size())
+            const auto current_pc = machine_state->pc / (this->show_odd ? 1 : 2);
-            {
-                const float window_h = ImGui::GetWindowHeight();
-                const float target_y = pc_index * line_h;
-                const float scroll_y = target_y - (window_h * 0.1f) + (line_h * 0.1f);
-                ImGui::SetScrollY(scroll_y);
-            }
-        }
 
+            const float window_h = ImGui::GetWindowHeight();
+            const float target_y = current_pc * line_h;
+            const float scroll_y = target_y - (window_h * 0.1f) + (line_h * 0.1f);
+            ImGui::SetScrollY(scroll_y);
+        }
 
         while (clipper.Step())
         {
             for (int i = clipper.DisplayStart; i < clipper.DisplayEnd; i++)
             {
-                const auto& instruction = this->disassembly[i];
+                const auto address = i * (this->show_odd ? 1 : 2);
-                auto line = this->build_line(instruction);
+                auto line = this->build_line(
-                if (instruction.address == machine_state->pc)
+                    this->interpreter->decode(
+                        this->interpreter->get_word(address),
+                        address
+                    )
+                );
+
+                if (address == machine_state->pc)
                 {
-                    ImGui::TextColored(ImVec4(1, 1, 0, 1), "%s", line.c_str());
+                    if (address % 2 == 0)
+                    {
+                        ImGui::TextColored(ImVec4(1, 1, 0, 1), "%s", line.c_str());
+                    }
+                    else
+                    {
+                        ImGui::TextColored(ImVec4(1, 1, 0, 1), "%s", line.c_str());
+                    }
                 }
                 else
                 {
-                    ImGui::TextUnformatted(line.c_str());
+                    if (address % 2 == 0)
+                    {
+                        ImGui::TextUnformatted(line.c_str());
+                    }
+                    else
+                    {
+                        ImGui::TextColored(ImVec4(1, 1, 1, .5), "%s", line.c_str());
+                    }
                 }
             }
         }
@@ -67,14 +82,32 @@ void Disassembler::render()
     ImGui::End();
 }
 
-void Disassembler::on_disassembly_callback(const std::vector<Instruction>& disassembly)
-{
-    this->disassembly = disassembly;
-}
 
 std::string Disassembler::build_line(const Instruction instruction) const
 {
-    const std::string addr_prefix = std::format("0x{:0>4x} | ", instruction.address);
+    std::string addr_prefix;
+    if (instruction.address == machine_state->pc)
+    {
+        if (instruction.address % 2 == 0)
+        {
+            addr_prefix = std::format(">0x{:0>4x} | ", instruction.address);
+        }
+        else
+        {
+            addr_prefix = std::format("> 0x{:0>4x} | ", instruction.address);
+        }
+    }
+    else
+    {
+        if (instruction.address % 2 == 0)
+        {
+            addr_prefix = std::format(" 0x{:0>4x} | ", instruction.address);
+        }
+        else
+        {
+            addr_prefix = std::format("- 0x{:0>4x} | ", instruction.address);
+        }
+    }
 
     switch (instruction.op_code)
     {

src/UI/Disassembler.h

@@ -4,6 +4,7 @@
 
 #include "CallbackManager.h"
 #include "../Graphics/Graphics.h"
+#include "../Interpreter/Interpreter.h"
 #include "../Interpreter/MachineState.h"
 
 
@@ -11,21 +12,21 @@ class Disassembler
 {
     std::shared_ptr<Graphics> graphis;
     std::shared_ptr<MachineState> machine_state;
+    std::shared_ptr<Interpreter> interpreter;
     std::shared_ptr<CallbackManager> callback_manager;
 
-    std::vector<Instruction> disassembly;
+    bool follow = true;
-
+    bool show_odd = false;
-    bool follow = false;
 
 public:
     Disassembler(
         std::shared_ptr<Graphics> graphics,
         std::shared_ptr<MachineState> machine_state,
+        std::shared_ptr<Interpreter> interpreter,
         std::shared_ptr<CallbackManager> callback_manager
     );
 
     void render();
-    void on_disassembly_callback(const std::vector<Instruction>& disassembly);
     std::string build_line(Instruction instruction) const;
 };
 

src/UI/Display.cpp

@@ -64,7 +64,7 @@ void Display::update_texture() const
             )
         );
 
-        for (int i = 0; i < display.size(); i++)
+        for (std::size_t i = 0; i < display.size(); i++)
         {
             if (display[i])
             {
@@ -108,4 +108,4 @@ void Display::display_widget() const
 
     ImGui::Image(static_cast<ImTextureID>(reinterpret_cast<intptr_t>(texture.get())), scaled_size);
     ImGui::End();
-}
+}

src/UI/MemoryViewer.cpp

@@ -24,76 +24,78 @@ void MemoryViewer::render()
         ImGui::SliderInt("##memory_view_width", &width, 1, 32, "%d", ImGuiSliderFlags_AlwaysClamp);
         ImGui::PopItemWidth();
 
+        auto total_lines = (std::size(this->machine_state->memory) + width - 1) / width;
+        ImGuiListClipper clipper;
+        clipper.Begin(total_lines);
 
-        auto dump_lines = this->get_memory_dump();
+        ImGui::BeginChild("##memory_view");
-        for (auto dump_line : dump_lines)
+        while (clipper.Step())
         {
-            ImGui::TextUnformatted(dump_line.c_str());
+            for (int i = clipper.DisplayStart; i < clipper.DisplayEnd; i++)
+            {
+                ImGui::TextUnformatted(get_memory_line(i).c_str());
+            }
         }
+
+        ImGui::EndChild();
     }
     ImGui::End();
 }
 
-std::vector<std::string> MemoryViewer::get_memory_dump() const
+std::string MemoryViewer::get_memory_line(const int line) const
 {
     auto& memory = this->machine_state->memory;
+
     const auto size = std::size(memory);
+    const auto i = line * this->width;
 
-    std::vector<std::string> dump_lines;
+    std::stringstream text_builder;
+    text_builder << "0x";
+    text_builder << std::hex
+        << std::setw(4)
+        << std::setfill('0')
+        << std::uppercase
+        << static_cast<unsigned int>(i)
+        << " | ";
 
-    for (auto i = 0; i < size; i += this->width)
+    for (int j = 0; j < this->width; j++)
     {
-        std::stringstream text_builder;
+        if (static_cast<std::size_t>(i + j) >= size)
-
-        text_builder << "0x";
-        text_builder << std::hex
-            << std::setw(4)
-            << std::setfill('0')
-            << std::uppercase
-            << static_cast<unsigned int>(i)
-            << " | ";
-
-        for (auto j = 0; j < this->width; j++)
         {
-            if (i + j >= size)
+            text_builder << "   ";
+        }
+        else
+        {
+            text_builder << std::hex
+                << std::setw(2)
+                << std::setfill('0')
+                << std::uppercase
+                << static_cast<unsigned int>(memory[i + j])
+                << " ";
+        }
+    }
+
+    text_builder << "| ";
+
+    for (int j = 0; j < this->width; j++)
+    {
+        if (static_cast<std::size_t>(i + j) >= size)
+        {
+            text_builder << ".";
+        }
+        else
+        {
+            auto byte = memory[i + j];
+            if (byte >= 32 && byte <= 126)
             {
-                text_builder << "   ";
+                text_builder << static_cast<char>(memory[i + j]);
             }
             else
-            {
-                text_builder << std::hex
-                    << std::setw(2)
-                    << std::setfill('0')
-                    << std::uppercase
-                    << static_cast<unsigned int>(memory[i + j])
-                    << " ";
-            }
-        }
-
-        text_builder << "| ";
-
-        for (auto j = 0; j < this->width; j++)
-        {
-            if (i + j >= size)
             {
                 text_builder << ".";
             }
-            else
-            {
-                auto byte = memory[i + j];
-                if (byte >= 32 && byte <= 126)
-                {
-                    text_builder << static_cast<char>(memory[i + j]);
-                }
-                else
-                {
-                    text_builder << ".";
-                }
-            }
         }
-
-        dump_lines.push_back(text_builder.str());
     }
 
-    return dump_lines;
+    return text_builder.str();
 }

src/UI/MemoryViewer.h

@@ -22,7 +22,7 @@ public:
     );
 
     void render();
-    std::vector<std::string> get_memory_dump() const;
+    std::string get_memory_line(int line) const;
 };
 
 

src/UI/RegisterView.cpp

@@ -0,0 +1,59 @@
+#include "RegisterView.h"
+
+#include "imgui.h"
+#include "../Interpreter/MachineState.h"
+
+RegisterView::RegisterView(
+    std::shared_ptr<Graphics> graphics,
+    std::shared_ptr<MachineState> machine_state,
+    std::shared_ptr<CallbackManager> callback_manager) :
+    graphics{std::move(graphics)},
+    machine_state{std::move(machine_state)},
+    callback_manager{std::move(callback_manager)}
+{
+}
+
+void RegisterView::render()
+{
+    if (ImGui::Begin("Chip8 - Registers"))
+    {
+        if (ImGui::BeginTable("Registers", 4, ImGuiTableFlags_Borders))
+        {
+            ImGui::TableNextRow();
+
+            ImGui::TableSetColumnIndex(0);
+            ImGui::Text("PC");
+            ImGui::Text("0x%04X", this->machine_state->pc);
+            ImGui::TableSetColumnIndex(1);
+            ImGui::Text("I");
+            ImGui::Text("0x%02X", this->machine_state->i);
+
+            ImGui::TableSetColumnIndex(2);
+            ImGui::Text("DT");
+            ImGui::Text("0x%04X", this->machine_state->dt);
+
+            ImGui::TableSetColumnIndex(3);
+            ImGui::Text("ST");
+            ImGui::Text("0x%04X", this->machine_state->st);
+        }
+        ImGui::EndTable();
+
+        if (ImGui::BeginTable("Registers", 8, ImGuiTableFlags_Borders))
+        {
+            for (int i = 0; i < 2; i++)
+            {
+                ImGui::TableNextRow();
+                for (int j = 0; j < 8; j++)
+                {
+                    ImGui::TableSetColumnIndex(j);
+                    ImGui::Text("V%i", i * 8 + j);
+                    ImGui::Text("0x%02X", this->machine_state->v[i * 8 + j]);
+                }
+            }
+        }
+        ImGui::EndTable();
+
+        ImGui::Text("Keyboard: 0b%016B", this->machine_state->keyboard);
+    }
+    ImGui::End();
+}

src/UI/RegisterView.h

@@ -0,0 +1,27 @@
+#ifndef REGISTERVIEW_H
+#define REGISTERVIEW_H
+#include <memory>
+
+#include "CallbackManager.h"
+#include "../Graphics/Graphics.h"
+#include "../Interpreter/MachineState.h"
+
+
+class RegisterView
+{
+    std::shared_ptr<Graphics> graphics;
+    std::shared_ptr<MachineState> machine_state;
+    std::shared_ptr<CallbackManager> callback_manager;
+
+public:
+    RegisterView(
+        std::shared_ptr<Graphics> graphics,
+        std::shared_ptr<MachineState> machine_state,
+        std::shared_ptr<CallbackManager> callback_manager
+    );
+
+    void render();
+};
+
+
+#endif //REGISTERVIEW_H

src/UI/StackViewer.cpp

@@ -0,0 +1,34 @@
+#include "StackViewer.h"
+
+#include "imgui.h"
+
+StackViewer::StackViewer(
+    std::shared_ptr<Graphics> graphics,
+    std::shared_ptr<MachineState> machine_state,
+    std::shared_ptr<CallbackManager> callback_manager
+) :
+    graphics{std::move(graphics)},
+    machine_state{std::move(machine_state)},
+    callback_manager{std::move(callback_manager)}
+{
+}
+
+void StackViewer::render()
+{
+    if (ImGui::Begin("Chip8 - Stack"))
+    {
+        if (ImGui::BeginTable("Stack", 2, ImGuiTableFlags_BordersV))
+        {
+            for (std::size_t i = 0; i < std::size(machine_state->stack); i++)
+            {
+                ImGui::TableNextRow();
+                ImGui::TableSetColumnIndex(0);
+                ImGui::Text("Depth %zu", i);
+                ImGui::TableSetColumnIndex(1);
+                ImGui::Text("0x%04X", machine_state->stack[i]);
+            }
+        }
+        ImGui::EndTable();
+    }
+    ImGui::End();
+}

src/UI/StackViewer.h

@@ -0,0 +1,25 @@
+#ifndef STACKVIEWER_H
+#define STACKVIEWER_H
+#include <memory>
+
+#include "CallbackManager.h"
+#include "../Graphics/Graphics.h"
+#include "../Interpreter/MachineState.h"
+
+class StackViewer
+{
+    std::shared_ptr<Graphics> graphics;
+    std::shared_ptr<MachineState> machine_state;
+    std::shared_ptr<CallbackManager> callback_manager;
+
+public:
+    StackViewer(
+        std::shared_ptr<Graphics> graphics,
+        std::shared_ptr<MachineState> machine_state,
+        std::shared_ptr<CallbackManager> callback_manager);
+
+    void render();
+};
+
+
+#endif //STACKVIEWER_H

src/UI/UIManager.cpp

@@ -2,22 +2,30 @@
 
 #include "Disassembler.h"
 #include "MemoryViewer.h"
+#include "RegisterView.h"
 #include "RomInfo.h"
+#include "StackViewer.h"
 
 UIManager::UIManager(
     std::shared_ptr<Graphics> graphics,
     std::shared_ptr<MachineState> machine_state,
+    std::shared_ptr<Interpreter> interpreter,
     std::shared_ptr<CallbackManager> callback_manager
 ) :
     graphics{std::move(graphics)},
     machine_state{std::move(machine_state)},
+    interpreter{std::move(interpreter)},
     callback_manager{std::move(callback_manager)},
 
     display{std::make_unique<Display>(this->graphics, this->machine_state)},
     control_panel{std::make_unique<ControlPanel>(this->graphics, this->machine_state, this->callback_manager)},
     rom_info{std::make_unique<RomInfo>(this->graphics, this->machine_state, this->callback_manager)},
     memory_viewer{std::make_unique<MemoryViewer>(this->graphics, this->machine_state, this->callback_manager)},
-    disassembler{std::make_unique<Disassembler>(this->graphics, this->machine_state, this->callback_manager)}
+    disassembler{
+        std::make_unique<Disassembler>(this->graphics, this->machine_state, this->interpreter, this->callback_manager)
+    },
+    register_view{std::make_unique<RegisterView>(this->graphics, this->machine_state, this->callback_manager)},
+    stack_viewer{std::make_unique<StackViewer>(this->graphics, this->machine_state, this->callback_manager)}
 {
 }
 
@@ -28,4 +36,6 @@ void UIManager::render()
     this->rom_info->render();
     this->memory_viewer->render();
     this->disassembler->render();
+    this->register_view->render();
+    this->stack_viewer->render();
 }

src/UI/UIManager.h

@@ -7,24 +7,31 @@
 #include "Disassembler.h"
 #include "Display.h"
 #include "MemoryViewer.h"
+#include "RegisterView.h"
 #include "RomInfo.h"
+#include "StackViewer.h"
 #include "../Graphics/Graphics.h"
+#include "../Interpreter/Interpreter.h"
 
 class UIManager
 {
     std::shared_ptr<Graphics> graphics;
     std::shared_ptr<MachineState> machine_state;
+    std::shared_ptr<Interpreter> interpreter;
     std::shared_ptr<CallbackManager> callback_manager;
     std::unique_ptr<Display> display;
     std::unique_ptr<ControlPanel> control_panel;
     std::unique_ptr<RomInfo> rom_info;
     std::unique_ptr<MemoryViewer> memory_viewer;
     std::unique_ptr<Disassembler> disassembler;
+    std::unique_ptr<RegisterView> register_view;
+    std::unique_ptr<StackViewer> stack_viewer;
 
 public:
     UIManager(
         std::shared_ptr<Graphics> graphics,
         std::shared_ptr<MachineState> machine_state,
+        std::shared_ptr<Interpreter> interpreter,
         std::shared_ptr<CallbackManager> callback_manager
     );
 

src/main.cpp

@@ -4,7 +4,7 @@
 #include <memory>
 #include "Machine.h"
 
-SDL_AppResult SDL_AppInit(void** appstate, int argc, char* argv[])
+SDL_AppResult SDL_AppInit(void** appstate, [[maybe_unused]] int argc, [[maybe_unused]] char* argv[])
 {
     auto machine = std::make_unique<Machine>();
     *appstate = machine.release();
@@ -33,7 +33,7 @@ SDL_AppResult SDL_AppEvent(void* appstate, SDL_Event* event)
     return SDL_APP_CONTINUE;
 }
 
-void SDL_AppQuit(void* appstate, SDL_AppResult result)
+void SDL_AppQuit(void* appstate, [[maybe_unused]] SDL_AppResult result)
 {
     std::unique_ptr<Machine> chip8(static_cast<Machine*>(appstate));
-}
+}