18 files changed, 1688 insertions, 49 deletions

diff --git a/src/citra_qt/CMakeLists.txt b/src/citra_qt/CMakeLists.txt
index 98a48a69a..90e5c6aa6 100644
--- a/src/citra_qt/CMakeLists.txt
+++ b/src/citra_qt/CMakeLists.txt
@@ -8,9 +8,12 @@ set(SRCS
             debugger/callstack.cpp
             debugger/disassembler.cpp
             debugger/graphics.cpp
+            debugger/graphics_breakpoints.cpp
             debugger/graphics_cmdlists.cpp
+            debugger/graphics_framebuffer.cpp
             debugger/ramview.cpp
             debugger/registers.cpp
+            util/spinbox.cpp
             bootmanager.cpp
             hotkeys.cpp
             main.cpp
@@ -23,9 +26,13 @@ set(HEADERS
             debugger/callstack.hxx
             debugger/disassembler.hxx
             debugger/graphics.hxx
+            debugger/graphics_breakpoints.hxx
+            debugger/graphics_breakpoints_p.hxx
             debugger/graphics_cmdlists.hxx
+            debugger/graphics_framebuffer.hxx
             debugger/ramview.hxx
             debugger/registers.hxx
+            util/spinbox.hxx
             bootmanager.hxx
             hotkeys.hxx
             main.hxx
diff --git a/src/citra_qt/bootmanager.cpp b/src/citra_qt/bootmanager.cpp
index 9a29f974b..b53206be6 100644
--- a/src/citra_qt/bootmanager.cpp
+++ b/src/citra_qt/bootmanager.cpp
@@ -14,6 +14,8 @@
 #include "core/core.h"
 #include "core/settings.h"
 
+#include "video_core/debug_utils/debug_utils.h"
+
 #include "video_core/video_core.h"
 
 #include "citra_qt/version.h"
@@ -65,14 +67,21 @@ void EmuThread::Stop()
     }
     stop_run = true;
 
+    // Release emu threads from any breakpoints, so that this doesn't hang forever.
+    Pica::g_debug_context->ClearBreakpoints();
+
     //core::g_state = core::SYS_DIE;
 
-    wait(500);
+    // TODO: Waiting here is just a bad workaround for retarded shutdown logic.
+    wait(1000);
     if (isRunning())
     {
         WARN_LOG(MASTER_LOG, "EmuThread still running, terminating...");
         quit();
-        wait(1000);
+
+        // TODO: Waiting 50 seconds can be necessary if the logging subsystem has a lot of spam
+        // queued... This should be fixed.
+        wait(50000);
         if (isRunning())
         {
             WARN_LOG(MASTER_LOG, "EmuThread STILL running, something is wrong here...");
diff --git a/src/citra_qt/debugger/graphics_breakpoints.cpp b/src/citra_qt/debugger/graphics_breakpoints.cpp
new file mode 100644
index 000000000..df5579e15
--- /dev/null
+++ b/src/citra_qt/debugger/graphics_breakpoints.cpp
@@ -0,0 +1,261 @@
+// Copyright 2014 Citra Emulator Project
+// Licensed under GPLv2
+// Refer to the license.txt file included.
+
+#include <QMetaType>
+#include <QPushButton>
+#include <QTreeWidget>
+#include <QVBoxLayout>
+#include <QLabel>
+
+#include "graphics_breakpoints.hxx"
+#include "graphics_breakpoints_p.hxx"
+
+BreakPointModel::BreakPointModel(std::shared_ptr<Pica::DebugContext> debug_context, QObject* parent)
+    : QAbstractListModel(parent), context_weak(debug_context),
+      at_breakpoint(debug_context->at_breakpoint),
+      active_breakpoint(debug_context->active_breakpoint)
+{
+
+}
+
+int BreakPointModel::columnCount(const QModelIndex& parent) const
+{
+    return 2;
+}
+
+int BreakPointModel::rowCount(const QModelIndex& parent) const
+{
+    return static_cast<int>(Pica::DebugContext::Event::NumEvents);
+}
+
+QVariant BreakPointModel::data(const QModelIndex& index, int role) const
+{
+    const auto event = static_cast<Pica::DebugContext::Event>(index.row());
+
+    switch (role) {
+    case Qt::DisplayRole:
+    {
+        switch (index.column()) {
+        case 0:
+        {
+            std::map<Pica::DebugContext::Event, QString> map;
+            map.insert({Pica::DebugContext::Event::CommandLoaded, tr("Pica command loaded")});
+            map.insert({Pica::DebugContext::Event::CommandProcessed, tr("Pica command processed")});
+            map.insert({Pica::DebugContext::Event::IncomingPrimitiveBatch, tr("Incoming primitive batch")});
+            map.insert({Pica::DebugContext::Event::FinishedPrimitiveBatch, tr("Finished primitive batch")});
+
+            _dbg_assert_(GUI, map.size() == static_cast<size_t>(Pica::DebugContext::Event::NumEvents));
+
+            return map[event];
+        }
+
+        case 1:
+            return data(index, Role_IsEnabled).toBool() ? tr("Enabled") : tr("Disabled");
+
+        default:
+            break;
+        }
+
+        break;
+    }
+
+    case Qt::BackgroundRole:
+    {
+        if (at_breakpoint && index.row() == static_cast<int>(active_breakpoint)) {
+            return QBrush(QColor(0xE0, 0xE0, 0x10));
+        }
+        break;
+    }
+
+    case Role_IsEnabled:
+    {
+        auto context = context_weak.lock();
+        return context && context->breakpoints[event].enabled;
+    }
+
+    default:
+        break;
+    }
+    return QVariant();
+}
+
+QVariant BreakPointModel::headerData(int section, Qt::Orientation orientation, int role) const
+{
+    switch(role) {
+    case Qt::DisplayRole:
+    {
+        if (section == 0) {
+            return tr("Event");
+        } else if (section == 1) {
+            return tr("Status");
+        }
+
+        break;
+    }
+    }
+
+    return QVariant();
+}
+
+bool BreakPointModel::setData(const QModelIndex& index, const QVariant& value, int role)
+{
+    const auto event = static_cast<Pica::DebugContext::Event>(index.row());
+
+    switch (role) {
+    case Role_IsEnabled:
+    {
+        auto context = context_weak.lock();
+        if (!context)
+            return false;
+
+        context->breakpoints[event].enabled = value.toBool();
+        QModelIndex changed_index = createIndex(index.row(), 1);
+        emit dataChanged(changed_index, changed_index);
+        return true;
+    }
+    }
+
+    return false;
+}
+
+
+void BreakPointModel::OnBreakPointHit(Pica::DebugContext::Event event)
+{
+    auto context = context_weak.lock();
+    if (!context)
+        return;
+
+    active_breakpoint = context->active_breakpoint;
+    at_breakpoint = context->at_breakpoint;
+    emit dataChanged(createIndex(static_cast<int>(event), 0),
+                     createIndex(static_cast<int>(event), 1));
+}
+
+void BreakPointModel::OnResumed()
+{
+    auto context = context_weak.lock();
+    if (!context)
+        return;
+
+    at_breakpoint = context->at_breakpoint;
+    emit dataChanged(createIndex(static_cast<int>(active_breakpoint), 0),
+                     createIndex(static_cast<int>(active_breakpoint), 1));
+    active_breakpoint = context->active_breakpoint;
+}
+
+
+GraphicsBreakPointsWidget::GraphicsBreakPointsWidget(std::shared_ptr<Pica::DebugContext> debug_context,
+                                                     QWidget* parent)
+    : QDockWidget(tr("Pica Breakpoints"), parent),
+      Pica::DebugContext::BreakPointObserver(debug_context)
+{
+    setObjectName("PicaBreakPointsWidget");
+
+    status_text = new QLabel(tr("Emulation running"));
+    resume_button = new QPushButton(tr("Resume"));
+    resume_button->setEnabled(false);
+
+    breakpoint_model = new BreakPointModel(debug_context, this);
+    breakpoint_list = new QTreeView;
+    breakpoint_list->setModel(breakpoint_model);
+
+    toggle_breakpoint_button = new QPushButton(tr("Enable"));
+    toggle_breakpoint_button->setEnabled(false);
+
+    qRegisterMetaType<Pica::DebugContext::Event>("Pica::DebugContext::Event");
+
+    connect(resume_button, SIGNAL(clicked()), this, SLOT(OnResumeRequested()));
+
+    connect(this, SIGNAL(BreakPointHit(Pica::DebugContext::Event,void*)),
+            this, SLOT(OnBreakPointHit(Pica::DebugContext::Event,void*)),
+            Qt::BlockingQueuedConnection);
+    connect(this, SIGNAL(Resumed()), this, SLOT(OnResumed()));
+
+    connect(this, SIGNAL(BreakPointHit(Pica::DebugContext::Event,void*)),
+            breakpoint_model, SLOT(OnBreakPointHit(Pica::DebugContext::Event)),
+            Qt::BlockingQueuedConnection);
+    connect(this, SIGNAL(Resumed()), breakpoint_model, SLOT(OnResumed()));
+
+    connect(this, SIGNAL(BreakPointsChanged(const QModelIndex&,const QModelIndex&)),
+            breakpoint_model, SIGNAL(dataChanged(const QModelIndex&,const QModelIndex&)));
+
+    connect(breakpoint_list->selectionModel(), SIGNAL(currentChanged(QModelIndex,QModelIndex)),
+            this, SLOT(OnBreakpointSelectionChanged(QModelIndex)));
+
+    connect(toggle_breakpoint_button, SIGNAL(clicked()), this, SLOT(OnToggleBreakpointEnabled()));
+
+    QWidget* main_widget = new QWidget;
+    auto main_layout = new QVBoxLayout;
+    {
+        auto sub_layout = new QHBoxLayout;
+        sub_layout->addWidget(status_text);
+        sub_layout->addWidget(resume_button);
+        main_layout->addLayout(sub_layout);
+    }
+    main_layout->addWidget(breakpoint_list);
+    main_layout->addWidget(toggle_breakpoint_button);
+    main_widget->setLayout(main_layout);
+
+    setWidget(main_widget);
+}
+
+void GraphicsBreakPointsWidget::OnPicaBreakPointHit(Event event, void* data)
+{
+    // Process in GUI thread
+    emit BreakPointHit(event, data);
+}
+
+void GraphicsBreakPointsWidget::OnBreakPointHit(Pica::DebugContext::Event event, void* data)
+{
+    status_text->setText(tr("Emulation halted at breakpoint"));
+    resume_button->setEnabled(true);
+}
+
+void GraphicsBreakPointsWidget::OnPicaResume()
+{
+    // Process in GUI thread
+    emit Resumed();
+}
+
+void GraphicsBreakPointsWidget::OnResumed()
+{
+    status_text->setText(tr("Emulation running"));
+    resume_button->setEnabled(false);
+}
+
+void GraphicsBreakPointsWidget::OnResumeRequested()
+{
+    if (auto context = context_weak.lock())
+        context->Resume();
+}
+
+void GraphicsBreakPointsWidget::OnBreakpointSelectionChanged(const QModelIndex& index)
+{
+    if (!index.isValid()) {
+        toggle_breakpoint_button->setEnabled(false);
+        return;
+    }
+
+    toggle_breakpoint_button->setEnabled(true);
+    UpdateToggleBreakpointButton(index);
+}
+
+void GraphicsBreakPointsWidget::OnToggleBreakpointEnabled()
+{
+    QModelIndex index = breakpoint_list->selectionModel()->currentIndex();
+    bool new_state = !(breakpoint_model->data(index, BreakPointModel::Role_IsEnabled).toBool());
+
+    breakpoint_model->setData(index, new_state,
+                              BreakPointModel::Role_IsEnabled);
+    UpdateToggleBreakpointButton(index);
+}
+
+void GraphicsBreakPointsWidget::UpdateToggleBreakpointButton(const QModelIndex& index)
+{
+    if (true == breakpoint_model->data(index, BreakPointModel::Role_IsEnabled).toBool()) {
+        toggle_breakpoint_button->setText(tr("Disable"));
+    } else {
+        toggle_breakpoint_button->setText(tr("Enable"));
+    }
+}
diff --git a/src/citra_qt/debugger/graphics_breakpoints.hxx b/src/citra_qt/debugger/graphics_breakpoints.hxx
new file mode 100644
index 000000000..2142c6fa1
--- /dev/null
+++ b/src/citra_qt/debugger/graphics_breakpoints.hxx
@@ -0,0 +1,53 @@
+// Copyright 2014 Citra Emulator Project
+// Licensed under GPLv2
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+
+#include <QAbstractListModel>
+#include <QDockWidget>
+
+#include "video_core/debug_utils/debug_utils.h"
+
+class QLabel;
+class QPushButton;
+class QTreeView;
+
+class BreakPointModel;
+
+class GraphicsBreakPointsWidget : public QDockWidget, Pica::DebugContext::BreakPointObserver {
+    Q_OBJECT
+
+    using Event = Pica::DebugContext::Event;
+
+public:
+    GraphicsBreakPointsWidget(std::shared_ptr<Pica::DebugContext> debug_context,
+                              QWidget* parent = nullptr);
+
+    void OnPicaBreakPointHit(Pica::DebugContext::Event event, void* data) override;
+    void OnPicaResume() override;
+
+public slots:
+    void OnBreakPointHit(Pica::DebugContext::Event event, void* data);
+    void OnResumeRequested();
+    void OnResumed();
+    void OnBreakpointSelectionChanged(const QModelIndex&);
+    void OnToggleBreakpointEnabled();
+
+signals:
+    void Resumed();
+    void BreakPointHit(Pica::DebugContext::Event event, void* data);
+    void BreakPointsChanged(const QModelIndex& topLeft, const QModelIndex& bottomRight);
+
+private:
+    void UpdateToggleBreakpointButton(const QModelIndex& index);
+
+    QLabel* status_text;
+    QPushButton* resume_button;
+    QPushButton* toggle_breakpoint_button;
+
+    BreakPointModel* breakpoint_model;
+    QTreeView* breakpoint_list;
+};
diff --git a/src/citra_qt/debugger/graphics_breakpoints_p.hxx b/src/citra_qt/debugger/graphics_breakpoints_p.hxx
new file mode 100644
index 000000000..bf5daf73d
--- /dev/null
+++ b/src/citra_qt/debugger/graphics_breakpoints_p.hxx
@@ -0,0 +1,38 @@
+// Copyright 2014 Citra Emulator Project
+// Licensed under GPLv2
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+
+#include <QAbstractListModel>
+
+#include "video_core/debug_utils/debug_utils.h"
+
+class BreakPointModel : public QAbstractListModel {
+    Q_OBJECT
+
+public:
+    enum {
+        Role_IsEnabled = Qt::UserRole,
+    };
+
+    BreakPointModel(std::shared_ptr<Pica::DebugContext> context, QObject* parent);
+
+    int columnCount(const QModelIndex& parent = QModelIndex()) const override;
+    int rowCount(const QModelIndex& parent = QModelIndex()) const override;
+    QVariant data(const QModelIndex& index, int role = Qt::DisplayRole) const override;
+    QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const override;
+
+    bool setData(const QModelIndex& index, const QVariant& value, int role = Qt::EditRole);
+
+public slots:
+    void OnBreakPointHit(Pica::DebugContext::Event event);
+    void OnResumed();
+
+private:
+    std::weak_ptr<Pica::DebugContext> context_weak;
+    bool at_breakpoint;
+    Pica::DebugContext::Event active_breakpoint;
+};
diff --git a/src/citra_qt/debugger/graphics_cmdlists.cpp b/src/citra_qt/debugger/graphics_cmdlists.cpp
index 71dd166cd..7f97cf143 100644
--- a/src/citra_qt/debugger/graphics_cmdlists.cpp
+++ b/src/citra_qt/debugger/graphics_cmdlists.cpp
@@ -2,30 +2,171 @@
 // Licensed under GPLv2
 // Refer to the license.txt file included.
 
+#include <QLabel>
 #include <QListView>
+#include <QMainWindow>
 #include <QPushButton>
 #include <QVBoxLayout>
 #include <QTreeView>
+#include <QSpinBox>
+#include <QComboBox>
+
+#include "video_core/pica.h"
+#include "video_core/math.h"
+
+#include "video_core/debug_utils/debug_utils.h"
 
 #include "graphics_cmdlists.hxx"
 
-GPUCommandListModel::GPUCommandListModel(QObject* parent) : QAbstractListModel(parent)
-{
+#include "util/spinbox.hxx"
+
+QImage LoadTexture(u8* src, const Pica::DebugUtils::TextureInfo& info) {
+    QImage decoded_image(info.width, info.height, QImage::Format_ARGB32);
+    for (int y = 0; y < info.height; ++y) {
+        for (int x = 0; x < info.width; ++x) {
+            Math::Vec4<u8> color = Pica::DebugUtils::LookupTexture(src, x, y, info);
+            decoded_image.setPixel(x, y, qRgba(color.r(), color.g(), color.b(), color.a()));
+        }
+    }
+
+    return decoded_image;
+}
+
+class TextureInfoWidget : public QWidget {
+public:
+    TextureInfoWidget(u8* src, const Pica::DebugUtils::TextureInfo& info, QWidget* parent = nullptr) : QWidget(parent) {
+        QLabel* image_widget = new QLabel;
+        QPixmap image_pixmap = QPixmap::fromImage(LoadTexture(src, info));
+        image_pixmap = image_pixmap.scaled(200, 100, Qt::KeepAspectRatio, Qt::SmoothTransformation);
+        image_widget->setPixmap(image_pixmap);
+
+        QVBoxLayout* layout = new QVBoxLayout;
+        layout->addWidget(image_widget);
+        setLayout(layout);
+    }
+};
+
+TextureInfoDockWidget::TextureInfoDockWidget(const Pica::DebugUtils::TextureInfo& info, QWidget* parent)
+    : QDockWidget(tr("Texture 0x%1").arg(info.address, 8, 16, QLatin1Char('0'))),
+      info(info) {
+
+    QWidget* main_widget = new QWidget;
+
+    QLabel* image_widget = new QLabel;
+
+    connect(this, SIGNAL(UpdatePixmap(const QPixmap&)), image_widget, SLOT(setPixmap(const QPixmap&)));
+
+    CSpinBox* phys_address_spinbox = new CSpinBox;
+    phys_address_spinbox->SetBase(16);
+    phys_address_spinbox->SetRange(0, 0xFFFFFFFF);
+    phys_address_spinbox->SetPrefix("0x");
+    phys_address_spinbox->SetValue(info.address);
+    connect(phys_address_spinbox, SIGNAL(ValueChanged(qint64)), this, SLOT(OnAddressChanged(qint64)));
+
+    QComboBox* format_choice = new QComboBox;
+    format_choice->addItem(tr("RGBA8"));
+    format_choice->addItem(tr("RGB8"));
+    format_choice->addItem(tr("RGBA5551"));
+    format_choice->addItem(tr("RGB565"));
+    format_choice->addItem(tr("RGBA4"));
+    format_choice->setCurrentIndex(static_cast<int>(info.format));
+    connect(format_choice, SIGNAL(currentIndexChanged(int)), this, SLOT(OnFormatChanged(int)));
+
+    QSpinBox* width_spinbox = new QSpinBox;
+    width_spinbox->setMaximum(65535);
+    width_spinbox->setValue(info.width);
+    connect(width_spinbox, SIGNAL(valueChanged(int)), this, SLOT(OnWidthChanged(int)));
+
+    QSpinBox* height_spinbox = new QSpinBox;
+    height_spinbox->setMaximum(65535);
+    height_spinbox->setValue(info.height);
+    connect(height_spinbox, SIGNAL(valueChanged(int)), this, SLOT(OnHeightChanged(int)));
+
+    QSpinBox* stride_spinbox = new QSpinBox;
+    stride_spinbox->setMaximum(65535 * 4);
+    stride_spinbox->setValue(info.stride);
+    connect(stride_spinbox, SIGNAL(valueChanged(int)), this, SLOT(OnStrideChanged(int)));
+
+    QVBoxLayout* main_layout = new QVBoxLayout;
+    main_layout->addWidget(image_widget);
+
+    {
+        QHBoxLayout* sub_layout = new QHBoxLayout;
+        sub_layout->addWidget(new QLabel(tr("Source Address:")));
+        sub_layout->addWidget(phys_address_spinbox);
+        main_layout->addLayout(sub_layout);
+    }
+
+    {
+        QHBoxLayout* sub_layout = new QHBoxLayout;
+        sub_layout->addWidget(new QLabel(tr("Format")));
+        sub_layout->addWidget(format_choice);
+        main_layout->addLayout(sub_layout);
+    }
+
+    {
+        QHBoxLayout* sub_layout = new QHBoxLayout;
+        sub_layout->addWidget(new QLabel(tr("Width:")));
+        sub_layout->addWidget(width_spinbox);
+        sub_layout->addStretch();
+        sub_layout->addWidget(new QLabel(tr("Height:")));
+        sub_layout->addWidget(height_spinbox);
+        sub_layout->addStretch();
+        sub_layout->addWidget(new QLabel(tr("Stride:")));
+        sub_layout->addWidget(stride_spinbox);
+        main_layout->addLayout(sub_layout);
+    }
+
+    main_widget->setLayout(main_layout);
+
+    emit UpdatePixmap(ReloadPixmap());
+
+    setWidget(main_widget);
+}
+
+void TextureInfoDockWidget::OnAddressChanged(qint64 value) {
+    info.address = value;
+    emit UpdatePixmap(ReloadPixmap());
+}
+
+void TextureInfoDockWidget::OnFormatChanged(int value) {
+    info.format = static_cast<Pica::Regs::TextureFormat>(value);
+    emit UpdatePixmap(ReloadPixmap());
+}
+
+void TextureInfoDockWidget::OnWidthChanged(int value) {
+    info.width = value;
+    emit UpdatePixmap(ReloadPixmap());
+}
+
+void TextureInfoDockWidget::OnHeightChanged(int value) {
+    info.height = value;
+    emit UpdatePixmap(ReloadPixmap());
+}
 
+void TextureInfoDockWidget::OnStrideChanged(int value) {
+    info.stride = value;
+    emit UpdatePixmap(ReloadPixmap());
 }
 
-int GPUCommandListModel::rowCount(const QModelIndex& parent) const
-{
+QPixmap TextureInfoDockWidget::ReloadPixmap() const {
+    u8* src = Memory::GetPointer(info.address);
+    return QPixmap::fromImage(LoadTexture(src, info));
+}
+
+GPUCommandListModel::GPUCommandListModel(QObject* parent) : QAbstractListModel(parent) {
+
+}
+
+int GPUCommandListModel::rowCount(const QModelIndex& parent) const {
     return pica_trace.writes.size();
 }
 
-int GPUCommandListModel::columnCount(const QModelIndex& parent) const
-{
+int GPUCommandListModel::columnCount(const QModelIndex& parent) const {
     return 2;
 }
 
-QVariant GPUCommandListModel::data(const QModelIndex& index, int role) const
-{
+QVariant GPUCommandListModel::data(const QModelIndex& index, int role) const {
     if (!index.isValid())
         return QVariant();
 
@@ -36,21 +177,39 @@ QVariant GPUCommandListModel::data(const QModelIndex& index, int role) const
     if (role == Qt::DisplayRole) {
         QString content;
         if (index.column() == 0) {
-            content = QString::fromLatin1(Pica::Regs::GetCommandName(cmd.cmd_id).c_str());
+            QString content = QString::fromLatin1(Pica::Regs::GetCommandName(cmd.cmd_id).c_str());
             content.append(" ");
+            return content;
         } else if (index.column() == 1) {
-            content.append(QString("%1 ").arg(cmd.hex, 8, 16, QLatin1Char('0')));
+            QString content = QString("%1 ").arg(cmd.hex, 8, 16, QLatin1Char('0'));
             content.append(QString("%1 ").arg(val, 8, 16, QLatin1Char('0')));
+            return content;
         }
+    } else if (role == CommandIdRole) {
+        return QVariant::fromValue<int>(cmd.cmd_id.Value());
+    }
 
-        return QVariant(content);
+    return QVariant();
+}
+
+QVariant GPUCommandListModel::headerData(int section, Qt::Orientation orientation, int role) const {
+    switch(role) {
+    case Qt::DisplayRole:
+    {
+        if (section == 0) {
+            return tr("Command Name");
+        } else if (section == 1) {
+            return tr("Data");
+        }
+
+        break;
+    }
     }
 
     return QVariant();
 }
 
-void GPUCommandListModel::OnPicaTraceFinished(const Pica::DebugUtils::PicaTrace& trace)
-{
+void GPUCommandListModel::OnPicaTraceFinished(const Pica::DebugUtils::PicaTrace& trace) {
     beginResetModel();
 
     pica_trace = trace;
@@ -58,38 +217,82 @@ void GPUCommandListModel::OnPicaTraceFinished(const Pica::DebugUtils::PicaTrace&
     endResetModel();
 }
 
+#define COMMAND_IN_RANGE(cmd_id, reg_name)   \
+    (cmd_id >= PICA_REG_INDEX(reg_name) &&   \
+     cmd_id < PICA_REG_INDEX(reg_name) + sizeof(decltype(Pica::registers.reg_name)) / 4)
+
+void GPUCommandListWidget::OnCommandDoubleClicked(const QModelIndex& index) {
+    const int command_id = list_widget->model()->data(index, GPUCommandListModel::CommandIdRole).toInt();
+    if (COMMAND_IN_RANGE(command_id, texture0)) {
+        auto info = Pica::DebugUtils::TextureInfo::FromPicaRegister(Pica::registers.texture0,
+                                                                    Pica::registers.texture0_format);
+
+        // TODO: Instead, emit a signal here to be caught by the main window widget.
+        auto main_window = static_cast<QMainWindow*>(parent());
+        main_window->tabifyDockWidget(this, new TextureInfoDockWidget(info, main_window));
+    }
+}
+
+void GPUCommandListWidget::SetCommandInfo(const QModelIndex& index) {
+    QWidget* new_info_widget;
+
+    const int command_id = list_widget->model()->data(index, GPUCommandListModel::CommandIdRole).toInt();
+    if (COMMAND_IN_RANGE(command_id, texture0)) {
+        u8* src = Memory::GetPointer(Pica::registers.texture0.GetPhysicalAddress());
+        auto info = Pica::DebugUtils::TextureInfo::FromPicaRegister(Pica::registers.texture0,
+                                                                    Pica::registers.texture0_format);
+        new_info_widget = new TextureInfoWidget(src, info);
+    } else {
+        new_info_widget = new QWidget;
+    }
+
+    widget()->layout()->removeWidget(command_info_widget);
+    delete command_info_widget;
+    widget()->layout()->addWidget(new_info_widget);
+    command_info_widget = new_info_widget;
+}
+#undef COMMAND_IN_RANGE
 
-GPUCommandListWidget::GPUCommandListWidget(QWidget* parent) : QDockWidget(tr("Pica Command List"), parent)
-{
+GPUCommandListWidget::GPUCommandListWidget(QWidget* parent) : QDockWidget(tr("Pica Command List"), parent) {
+    setObjectName("Pica Command List");
     GPUCommandListModel* model = new GPUCommandListModel(this);
 
     QWidget* main_widget = new QWidget;
 
-    QTreeView* list_widget = new QTreeView;
+    list_widget = new QTreeView;
     list_widget->setModel(model);
     list_widget->setFont(QFont("monospace"));
     list_widget->setRootIsDecorated(false);
 
-    QPushButton* toggle_tracing = new QPushButton(tr("Start Tracing"));
+    connect(list_widget->selectionModel(), SIGNAL(currentChanged(const QModelIndex&,const QModelIndex&)),
+            this, SLOT(SetCommandInfo(const QModelIndex&)));
+    connect(list_widget, SIGNAL(doubleClicked(const QModelIndex&)),
+            this, SLOT(OnCommandDoubleClicked(const QModelIndex&)));
+
+    toggle_tracing = new QPushButton(tr("Start Tracing"));
 
     connect(toggle_tracing, SIGNAL(clicked()), this, SLOT(OnToggleTracing()));
     connect(this, SIGNAL(TracingFinished(const Pica::DebugUtils::PicaTrace&)),
             model, SLOT(OnPicaTraceFinished(const Pica::DebugUtils::PicaTrace&)));
 
+    command_info_widget = new QWidget;
+
     QVBoxLayout* main_layout = new QVBoxLayout;
     main_layout->addWidget(list_widget);
     main_layout->addWidget(toggle_tracing);
+    main_layout->addWidget(command_info_widget);
     main_widget->setLayout(main_layout);
 
     setWidget(main_widget);
 }
 
-void GPUCommandListWidget::OnToggleTracing()
-{
+void GPUCommandListWidget::OnToggleTracing() {
     if (!Pica::DebugUtils::IsPicaTracing()) {
         Pica::DebugUtils::StartPicaTracing();
+        toggle_tracing->setText(tr("Finish Tracing"));
     } else {
         pica_trace = Pica::DebugUtils::FinishPicaTracing();
         emit TracingFinished(*pica_trace);
+        toggle_tracing->setText(tr("Start Tracing"));
     }
 }
diff --git a/src/citra_qt/debugger/graphics_cmdlists.hxx b/src/citra_qt/debugger/graphics_cmdlists.hxx
index 1523e724f..a459bba64 100644
--- a/src/citra_qt/debugger/graphics_cmdlists.hxx
+++ b/src/citra_qt/debugger/graphics_cmdlists.hxx
@@ -10,16 +10,24 @@
 #include "video_core/gpu_debugger.h"
 #include "video_core/debug_utils/debug_utils.h"
 
+class QPushButton;
+class QTreeView;
+
 class GPUCommandListModel : public QAbstractListModel
 {
     Q_OBJECT
 
 public:
+    enum {
+        CommandIdRole = Qt::UserRole,
+    };
+
     GPUCommandListModel(QObject* parent);
 
     int columnCount(const QModelIndex& parent = QModelIndex()) const override;
     int rowCount(const QModelIndex& parent = QModelIndex()) const override;
     QVariant data(const QModelIndex& index, int role = Qt::DisplayRole) const override;
+    QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const override;
 
 public slots:
     void OnPicaTraceFinished(const Pica::DebugUtils::PicaTrace& trace);
@@ -37,10 +45,39 @@ public:
 
 public slots:
     void OnToggleTracing();
+    void OnCommandDoubleClicked(const QModelIndex&);
+
+    void SetCommandInfo(const QModelIndex&);
 
 signals:
     void TracingFinished(const Pica::DebugUtils::PicaTrace&);
 
 private:
     std::unique_ptr<Pica::DebugUtils::PicaTrace> pica_trace;
+
+    QTreeView* list_widget;
+    QWidget* command_info_widget;
+    QPushButton* toggle_tracing;
+};
+
+class TextureInfoDockWidget : public QDockWidget {
+    Q_OBJECT
+
+public:
+    TextureInfoDockWidget(const Pica::DebugUtils::TextureInfo& info, QWidget* parent = nullptr);
+
+signals:
+    void UpdatePixmap(const QPixmap& pixmap);
+
+private slots:
+    void OnAddressChanged(qint64 value);
+    void OnFormatChanged(int value);
+    void OnWidthChanged(int value);
+    void OnHeightChanged(int value);
+    void OnStrideChanged(int value);
+
+private:
+    QPixmap ReloadPixmap() const;
+
+    Pica::DebugUtils::TextureInfo info;
 };
diff --git a/src/citra_qt/debugger/graphics_framebuffer.cpp b/src/citra_qt/debugger/graphics_framebuffer.cpp
new file mode 100644
index 000000000..ac47f298d
--- /dev/null
+++ b/src/citra_qt/debugger/graphics_framebuffer.cpp
@@ -0,0 +1,282 @@
+// Copyright 2014 Citra Emulator Project
+// Licensed under GPLv2
+// Refer to the license.txt file included.
+
+#include <QBoxLayout>
+#include <QComboBox>
+#include <QDebug>
+#include <QLabel>
+#include <QMetaType>
+#include <QPushButton>
+#include <QSpinBox>
+
+#include "video_core/pica.h"
+
+#include "graphics_framebuffer.hxx"
+
+#include "util/spinbox.hxx"
+
+BreakPointObserverDock::BreakPointObserverDock(std::shared_ptr<Pica::DebugContext> debug_context,
+                                               const QString& title, QWidget* parent)
+    : QDockWidget(title, parent), BreakPointObserver(debug_context)
+{
+    qRegisterMetaType<Pica::DebugContext::Event>("Pica::DebugContext::Event");
+
+    connect(this, SIGNAL(Resumed()), this, SLOT(OnResumed()));
+
+    // NOTE: This signal is emitted from a non-GUI thread, but connect() takes
+    //       care of delaying its handling to the GUI thread.
+    connect(this, SIGNAL(BreakPointHit(Pica::DebugContext::Event,void*)),
+            this, SLOT(OnBreakPointHit(Pica::DebugContext::Event,void*)),
+            Qt::BlockingQueuedConnection);
+}
+
+void BreakPointObserverDock::OnPicaBreakPointHit(Pica::DebugContext::Event event, void* data)
+{
+    emit BreakPointHit(event, data);
+}
+
+void BreakPointObserverDock::OnPicaResume()
+{
+    emit Resumed();
+}
+
+
+GraphicsFramebufferWidget::GraphicsFramebufferWidget(std::shared_ptr<Pica::DebugContext> debug_context,
+                                                     QWidget* parent)
+    : BreakPointObserverDock(debug_context, tr("Pica Framebuffer"), parent),
+      framebuffer_source(Source::PicaTarget)
+{
+    setObjectName("PicaFramebuffer");
+
+    framebuffer_source_list = new QComboBox;
+    framebuffer_source_list->addItem(tr("Active Render Target"));
+    framebuffer_source_list->addItem(tr("Custom"));
+    framebuffer_source_list->setCurrentIndex(static_cast<int>(framebuffer_source));
+
+    framebuffer_address_control = new CSpinBox;
+    framebuffer_address_control->SetBase(16);
+    framebuffer_address_control->SetRange(0, 0xFFFFFFFF);
+    framebuffer_address_control->SetPrefix("0x");
+
+    framebuffer_width_control = new QSpinBox;
+    framebuffer_width_control->setMinimum(1);
+    framebuffer_width_control->setMaximum(std::numeric_limits<int>::max()); // TODO: Find actual maximum
+
+    framebuffer_height_control = new QSpinBox;
+    framebuffer_height_control->setMinimum(1);
+    framebuffer_height_control->setMaximum(std::numeric_limits<int>::max()); // TODO: Find actual maximum
+
+    framebuffer_format_control = new QComboBox;
+    framebuffer_format_control->addItem(tr("RGBA8"));
+    framebuffer_format_control->addItem(tr("RGB8"));
+    framebuffer_format_control->addItem(tr("RGBA5551"));
+    framebuffer_format_control->addItem(tr("RGB565"));
+    framebuffer_format_control->addItem(tr("RGBA4"));
+
+    // TODO: This QLabel should shrink the image to the available space rather than just expanding...
+    framebuffer_picture_label = new QLabel;
+
+    auto enlarge_button = new QPushButton(tr("Enlarge"));
+
+    // Connections
+    connect(this, SIGNAL(Update()), this, SLOT(OnUpdate()));
+    connect(framebuffer_source_list, SIGNAL(currentIndexChanged(int)), this, SLOT(OnFramebufferSourceChanged(int)));
+    connect(framebuffer_address_control, SIGNAL(ValueChanged(qint64)), this, SLOT(OnFramebufferAddressChanged(qint64)));
+    connect(framebuffer_width_control, SIGNAL(valueChanged(int)), this, SLOT(OnFramebufferWidthChanged(int)));
+    connect(framebuffer_height_control, SIGNAL(valueChanged(int)), this, SLOT(OnFramebufferHeightChanged(int)));
+    connect(framebuffer_format_control, SIGNAL(currentIndexChanged(int)), this, SLOT(OnFramebufferFormatChanged(int)));
+
+    auto main_widget = new QWidget;
+    auto main_layout = new QVBoxLayout;
+    {
+        auto sub_layout = new QHBoxLayout;
+        sub_layout->addWidget(new QLabel(tr("Source:")));
+        sub_layout->addWidget(framebuffer_source_list);
+        main_layout->addLayout(sub_layout);
+    }
+    {
+        auto sub_layout = new QHBoxLayout;
+        sub_layout->addWidget(new QLabel(tr("Virtual Address:")));
+        sub_layout->addWidget(framebuffer_address_control);
+        main_layout->addLayout(sub_layout);
+    }
+    {
+        auto sub_layout = new QHBoxLayout;
+        sub_layout->addWidget(new QLabel(tr("Width:")));
+        sub_layout->addWidget(framebuffer_width_control);
+        main_layout->addLayout(sub_layout);
+    }
+    {
+        auto sub_layout = new QHBoxLayout;
+        sub_layout->addWidget(new QLabel(tr("Height:")));
+        sub_layout->addWidget(framebuffer_height_control);
+        main_layout->addLayout(sub_layout);
+    }
+    {
+        auto sub_layout = new QHBoxLayout;
+        sub_layout->addWidget(new QLabel(tr("Format:")));
+        sub_layout->addWidget(framebuffer_format_control);
+        main_layout->addLayout(sub_layout);
+    }
+    main_layout->addWidget(framebuffer_picture_label);
+    main_layout->addWidget(enlarge_button);
+    main_widget->setLayout(main_layout);
+    setWidget(main_widget);
+
+    // Load current data - TODO: Make sure this works when emulation is not running
+    emit Update();
+    widget()->setEnabled(false); // TODO: Only enable if currently at breakpoint
+}
+
+void GraphicsFramebufferWidget::OnBreakPointHit(Pica::DebugContext::Event event, void* data)
+{
+    emit Update();
+    widget()->setEnabled(true);
+}
+
+void GraphicsFramebufferWidget::OnResumed()
+{
+    widget()->setEnabled(false);
+}
+
+void GraphicsFramebufferWidget::OnFramebufferSourceChanged(int new_value)
+{
+    framebuffer_source = static_cast<Source>(new_value);
+    emit Update();
+}
+
+void GraphicsFramebufferWidget::OnFramebufferAddressChanged(qint64 new_value)
+{
+    if (framebuffer_address != new_value) {
+        framebuffer_address = static_cast<unsigned>(new_value);
+
+        framebuffer_source_list->setCurrentIndex(static_cast<int>(Source::Custom));
+        emit Update();
+    }
+}
+
+void GraphicsFramebufferWidget::OnFramebufferWidthChanged(int new_value)
+{
+    if (framebuffer_width != new_value) {
+        framebuffer_width = new_value;
+
+        framebuffer_source_list->setCurrentIndex(static_cast<int>(Source::Custom));
+        emit Update();
+    }
+}
+
+void GraphicsFramebufferWidget::OnFramebufferHeightChanged(int new_value)
+{
+    if (framebuffer_height != new_value) {
+        framebuffer_height = new_value;
+
+        framebuffer_source_list->setCurrentIndex(static_cast<int>(Source::Custom));
+        emit Update();
+    }
+}
+
+void GraphicsFramebufferWidget::OnFramebufferFormatChanged(int new_value)
+{
+    if (framebuffer_format != static_cast<Format>(new_value)) {
+        framebuffer_format = static_cast<Format>(new_value);
+
+        framebuffer_source_list->setCurrentIndex(static_cast<int>(Source::Custom));
+        emit Update();
+    }
+}
+
+void GraphicsFramebufferWidget::OnUpdate()
+{
+    QPixmap pixmap;
+
+    switch (framebuffer_source) {
+    case Source::PicaTarget:
+    {
+        // TODO: Store a reference to the registers in the debug context instead of accessing them directly...
+
+        auto framebuffer = Pica::registers.framebuffer;
+        using Framebuffer = decltype(framebuffer);
+
+        framebuffer_address = framebuffer.GetColorBufferAddress();
+        framebuffer_width = framebuffer.GetWidth();
+        framebuffer_height = framebuffer.GetHeight();
+        framebuffer_format = static_cast<Format>(framebuffer.color_format);
+
+        break;
+    }
+
+    case Source::Custom:
+    {
+        // Keep user-specified values
+        break;
+    }
+
+    default:
+        qDebug() << "Unknown framebuffer source " << static_cast<int>(framebuffer_source);
+        break;
+    }
+
+    // TODO: Implement a good way to visualize alpha components!
+    // TODO: Unify this decoding code with the texture decoder
+    switch (framebuffer_format) {
+    case Format::RGBA8:
+    {
+        QImage decoded_image(framebuffer_width, framebuffer_height, QImage::Format_ARGB32);
+        u32* color_buffer = (u32*)Memory::GetPointer(framebuffer_address);
+        for (int y = 0; y < framebuffer_height; ++y) {
+            for (int x = 0; x < framebuffer_width; ++x) {
+                u32 value = *(color_buffer + x + y * framebuffer_width);
+
+                decoded_image.setPixel(x, y, qRgba((value >> 16) & 0xFF, (value >> 8) & 0xFF, value & 0xFF, 255/*value >> 24*/));
+            }
+        }
+        pixmap = QPixmap::fromImage(decoded_image);
+        break;
+    }
+
+    case Format::RGB8:
+    {
+        QImage decoded_image(framebuffer_width, framebuffer_height, QImage::Format_ARGB32);
+        u8* color_buffer = Memory::GetPointer(framebuffer_address);
+        for (int y = 0; y < framebuffer_height; ++y) {
+            for (int x = 0; x < framebuffer_width; ++x) {
+                u8* pixel_pointer = color_buffer + x * 3 + y * 3 * framebuffer_width;
+
+                decoded_image.setPixel(x, y, qRgba(pixel_pointer[0], pixel_pointer[1], pixel_pointer[2], 255/*value >> 24*/));
+            }
+        }
+        pixmap = QPixmap::fromImage(decoded_image);
+        break;
+    }
+
+    case Format::RGBA5551:
+    {
+        QImage decoded_image(framebuffer_width, framebuffer_height, QImage::Format_ARGB32);
+        u32* color_buffer = (u32*)Memory::GetPointer(framebuffer_address);
+        for (int y = 0; y < framebuffer_height; ++y) {
+            for (int x = 0; x < framebuffer_width; ++x) {
+                u16 value = *(u16*)(((u8*)color_buffer) + x * 2 + y * framebuffer_width * 2);
+                u8 r = (value >> 11) & 0x1F;
+                u8 g = (value >> 6) & 0x1F;
+                u8 b = (value >> 1) & 0x1F;
+                u8 a = value & 1;
+
+                decoded_image.setPixel(x, y, qRgba(r, g, b, 255/*a*/));
+            }
+        }
+        pixmap = QPixmap::fromImage(decoded_image);
+        break;
+    }
+
+    default:
+        qDebug() << "Unknown fb color format " << static_cast<int>(framebuffer_format);
+        break;
+    }
+
+    framebuffer_address_control->SetValue(framebuffer_address);
+    framebuffer_width_control->setValue(framebuffer_width);
+    framebuffer_height_control->setValue(framebuffer_height);
+    framebuffer_format_control->setCurrentIndex(static_cast<int>(framebuffer_format));
+    framebuffer_picture_label->setPixmap(pixmap);
+}
diff --git a/src/citra_qt/debugger/graphics_framebuffer.hxx b/src/citra_qt/debugger/graphics_framebuffer.hxx
new file mode 100644
index 000000000..1151ee7a1
--- /dev/null
+++ b/src/citra_qt/debugger/graphics_framebuffer.hxx
@@ -0,0 +1,92 @@
+// Copyright 2014 Citra Emulator Project
+// Licensed under GPLv2
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <QDockWidget>
+
+#include "video_core/debug_utils/debug_utils.h"
+
+class QComboBox;
+class QLabel;
+class QSpinBox;
+
+class CSpinBox;
+
+// Utility class which forwards calls to OnPicaBreakPointHit and OnPicaResume to public slots.
+// This is because the Pica breakpoint callbacks are called from a non-GUI thread, while
+// the widget usually wants to perform reactions in the GUI thread.
+class BreakPointObserverDock : public QDockWidget, Pica::DebugContext::BreakPointObserver {
+    Q_OBJECT
+
+public:
+    BreakPointObserverDock(std::shared_ptr<Pica::DebugContext> debug_context, const QString& title,
+                           QWidget* parent = nullptr);
+
+    void OnPicaBreakPointHit(Pica::DebugContext::Event event, void* data) override;
+    void OnPicaResume() override;
+
+private slots:
+    virtual void OnBreakPointHit(Pica::DebugContext::Event event, void* data) = 0;
+    virtual void OnResumed() = 0;
+
+signals:
+    void Resumed();
+    void BreakPointHit(Pica::DebugContext::Event event, void* data);
+};
+
+class GraphicsFramebufferWidget : public BreakPointObserverDock {
+    Q_OBJECT
+
+    using Event = Pica::DebugContext::Event;
+
+    enum class Source {
+        PicaTarget = 0,
+        Custom = 1,
+
+        // TODO: Add GPU framebuffer sources!
+    };
+
+    enum class Format {
+        RGBA8    = 0,
+        RGB8     = 1,
+        RGBA5551 = 2,
+        RGB565   = 3,
+        RGBA4    = 4,
+    };
+
+public:
+    GraphicsFramebufferWidget(std::shared_ptr<Pica::DebugContext> debug_context, QWidget* parent = nullptr);
+
+public slots:
+    void OnFramebufferSourceChanged(int new_value);
+    void OnFramebufferAddressChanged(qint64 new_value);
+    void OnFramebufferWidthChanged(int new_value);
+    void OnFramebufferHeightChanged(int new_value);
+    void OnFramebufferFormatChanged(int new_value);
+    void OnUpdate();
+
+private slots:
+    void OnBreakPointHit(Pica::DebugContext::Event event, void* data) override;
+    void OnResumed() override;
+
+signals:
+    void Update();
+
+private:
+
+    QComboBox* framebuffer_source_list;
+    CSpinBox* framebuffer_address_control;
+    QSpinBox* framebuffer_width_control;
+    QSpinBox* framebuffer_height_control;
+    QComboBox* framebuffer_format_control;
+
+    QLabel* framebuffer_picture_label;
+
+    Source framebuffer_source;
+    unsigned framebuffer_address;
+    unsigned framebuffer_width;
+    unsigned framebuffer_height;
+    Format framebuffer_format;
+};
diff --git a/src/citra_qt/main.cpp b/src/citra_qt/main.cpp
index 0701decef..b4e3ad964 100644
--- a/src/citra_qt/main.cpp
+++ b/src/citra_qt/main.cpp
@@ -20,7 +20,9 @@
 #include "debugger/callstack.hxx"
 #include "debugger/ramview.hxx"
 #include "debugger/graphics.hxx"
+#include "debugger/graphics_breakpoints.hxx"
 #include "debugger/graphics_cmdlists.hxx"
+#include "debugger/graphics_framebuffer.hxx"
 
 #include "core/settings.h"
 #include "core/system.h"
@@ -36,6 +38,8 @@ GMainWindow::GMainWindow()
 {
     LogManager::Init();
 
+    Pica::g_debug_context = Pica::DebugContext::Construct();
+
     Config config;
 
     if (!Settings::values.enable_log)
@@ -67,12 +71,22 @@ GMainWindow::GMainWindow()
     addDockWidget(Qt::RightDockWidgetArea, graphicsCommandsWidget);
     graphicsCommandsWidget->hide();
 
+    auto graphicsBreakpointsWidget = new GraphicsBreakPointsWidget(Pica::g_debug_context, this);
+    addDockWidget(Qt::RightDockWidgetArea, graphicsBreakpointsWidget);
+    graphicsBreakpointsWidget->hide();
+
+    auto graphicsFramebufferWidget = new GraphicsFramebufferWidget(Pica::g_debug_context, this);
+    addDockWidget(Qt::RightDockWidgetArea, graphicsFramebufferWidget);
+    graphicsFramebufferWidget->hide();
+
     QMenu* debug_menu = ui.menu_View->addMenu(tr("Debugging"));
     debug_menu->addAction(disasmWidget->toggleViewAction());
     debug_menu->addAction(registersWidget->toggleViewAction());
     debug_menu->addAction(callstackWidget->toggleViewAction());
     debug_menu->addAction(graphicsWidget->toggleViewAction());
     debug_menu->addAction(graphicsCommandsWidget->toggleViewAction());
+    debug_menu->addAction(graphicsBreakpointsWidget->toggleViewAction());
+    debug_menu->addAction(graphicsFramebufferWidget->toggleViewAction());
 
     // Set default UI state
     // geometry: 55% of the window contents are in the upper screen half, 45% in the lower half
@@ -133,6 +147,8 @@ GMainWindow::~GMainWindow()
     // will get automatically deleted otherwise
     if (render_window->parent() == nullptr)
         delete render_window;
+
+    Pica::g_debug_context.reset();
 }
 
 void GMainWindow::BootGame(std::string filename)
diff --git a/src/citra_qt/util/spinbox.cpp b/src/citra_qt/util/spinbox.cpp
new file mode 100644
index 000000000..80dc67d7d
--- /dev/null
+++ b/src/citra_qt/util/spinbox.cpp
@@ -0,0 +1,303 @@
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+
+// Copyright 2014 Tony Wasserka
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above copyright
+//       notice, this list of conditions and the following disclaimer in the
+//       documentation and/or other materials provided with the distribution.
+//     * Neither the name of the owner nor the names of its contributors may
+//       be used to endorse or promote products derived from this software
+//       without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include <QLineEdit>
+#include <QRegExpValidator>
+
+#include "common/log.h"
+
+#include "spinbox.hxx"
+
+CSpinBox::CSpinBox(QWidget* parent) : QAbstractSpinBox(parent), base(10), min_value(-100), max_value(100), value(0), num_digits(0)
+{
+    // TODO: Might be nice to not immediately call the slot.
+    //       Think of an address that is being replaced by a different one, in which case a lot
+    //       invalid intermediate addresses would be read from during editing.
+    connect(lineEdit(), SIGNAL(textEdited(QString)), this, SLOT(OnEditingFinished()));
+
+    UpdateText();
+}
+
+void CSpinBox::SetValue(qint64 val)
+{
+    auto old_value = value;
+    value = std::max(std::min(val, max_value), min_value);
+
+    if (old_value != value) {
+        UpdateText();
+        emit ValueChanged(value);
+    }
+}
+
+void CSpinBox::SetRange(qint64 min, qint64 max)
+{
+    min_value = min;
+    max_value = max;
+
+    SetValue(value);
+    UpdateText();
+}
+
+void CSpinBox::stepBy(int steps)
+{
+    auto new_value = value;
+    // Scale number of steps by the currently selected digit
+    // TODO: Move this code elsewhere and enable it.
+    // TODO: Support for num_digits==0, too
+    // TODO: Support base!=16, too
+    // TODO: Make the cursor not jump back to the end of the line...
+    /*if (base == 16 && num_digits > 0) {
+        int digit = num_digits - (lineEdit()->cursorPosition() - prefix.length()) - 1;
+        digit = std::max(0, std::min(digit, num_digits - 1));
+        steps <<= digit * 4;
+    }*/
+
+    // Increment "new_value" by "steps", and perform annoying overflow checks, too.
+    if (steps < 0 && new_value + steps > new_value) {
+        new_value = std::numeric_limits<qint64>::min();
+    } else if (steps > 0 && new_value + steps < new_value) {
+        new_value = std::numeric_limits<qint64>::max();
+    } else {
+        new_value += steps;
+    }
+
+    SetValue(new_value);
+    UpdateText();
+}
+
+QAbstractSpinBox::StepEnabled CSpinBox::stepEnabled() const
+{
+    StepEnabled ret = StepNone;
+
+    if (value > min_value)
+        ret |= StepDownEnabled;
+
+    if (value < max_value)
+        ret |= StepUpEnabled;
+
+    return ret;
+}
+
+void CSpinBox::SetBase(int base)
+{
+    this->base = base;
+
+    UpdateText();
+}
+
+void CSpinBox::SetNumDigits(int num_digits)
+{
+    this->num_digits = num_digits;
+
+    UpdateText();
+}
+
+void CSpinBox::SetPrefix(const QString& prefix)
+{
+    this->prefix = prefix;
+
+    UpdateText();
+}
+
+void CSpinBox::SetSuffix(const QString& suffix)
+{
+    this->suffix = suffix;
+
+    UpdateText();
+}
+
+static QString StringToInputMask(const QString& input) {
+    QString mask = input;
+
+    // ... replace any special characters by their escaped counterparts ...
+    mask.replace("\\", "\\\\");
+    mask.replace("A", "\\A");
+    mask.replace("a", "\\a");
+    mask.replace("N", "\\N");
+    mask.replace("n", "\\n");
+    mask.replace("X", "\\X");
+    mask.replace("x", "\\x");
+    mask.replace("9", "\\9");
+    mask.replace("0", "\\0");
+    mask.replace("D", "\\D");
+    mask.replace("d", "\\d");
+    mask.replace("#", "\\#");
+    mask.replace("H", "\\H");
+    mask.replace("h", "\\h");
+    mask.replace("B", "\\B");
+    mask.replace("b", "\\b");
+    mask.replace(">", "\\>");
+    mask.replace("<", "\\<");
+    mask.replace("!", "\\!");
+
+    return mask;
+}
+
+void CSpinBox::UpdateText()
+{
+    // If a fixed number of digits is used, we put the line edit in insertion mode by setting an
+    // input mask.
+    QString mask;
+    if (num_digits != 0) {
+        mask += StringToInputMask(prefix);
+
+        // For base 10 and negative range, demand a single sign character
+        if (HasSign())
+            mask += "X"; // identified as "-" or "+" in the validator
+
+        // Uppercase digits greater than 9.
+        mask += ">";
+
+        // The greatest signed 64-bit number has 19 decimal digits.
+        // TODO: Could probably make this more generic with some logarithms.
+        // For reference, unsigned 64-bit can have up to 20 decimal digits.
+        int digits = (num_digits != 0) ? num_digits
+                     : (base == 16) ? 16
+                     : (base == 10) ? 19
+                     : 0xFF; // fallback case...
+
+        // Match num_digits digits
+        // Digits irrelevant to the chosen number base are filtered in the validator
+        mask += QString("H").repeated(std::max(num_digits, 1));
+
+        // Switch off case conversion
+        mask += "!";
+
+        mask += StringToInputMask(suffix);
+    }
+    lineEdit()->setInputMask(mask);
+
+    // Set new text without changing the cursor position. This will cause the cursor to briefly
+    // appear at the end of the line and then to jump back to its original position. That's
+    // a bit ugly, but better than having setText() move the cursor permanently all the time.
+    int cursor_position = lineEdit()->cursorPosition();
+    lineEdit()->setText(TextFromValue());
+    lineEdit()->setCursorPosition(cursor_position);
+}
+
+QString CSpinBox::TextFromValue()
+{
+    return prefix
+           + QString(HasSign() ? ((value < 0) ? "-" : "+") : "")
+           + QString("%1").arg(abs(value), num_digits, base, QLatin1Char('0')).toUpper()
+           + suffix;
+}
+
+qint64 CSpinBox::ValueFromText()
+{
+    unsigned strpos = prefix.length();
+
+    QString num_string = text().mid(strpos, text().length() - strpos - suffix.length());
+    return num_string.toLongLong(nullptr, base);
+}
+
+bool CSpinBox::HasSign() const
+{
+    return base == 10 && min_value < 0;
+}
+
+void CSpinBox::OnEditingFinished()
+{
+    // Only update for valid input
+    QString input = lineEdit()->text();
+    int pos = 0;
+    if (QValidator::Acceptable == validate(input, pos))
+        SetValue(ValueFromText());
+}
+
+QValidator::State CSpinBox::validate(QString& input, int& pos) const
+{
+    if (!prefix.isEmpty() && input.left(prefix.length()) != prefix)
+        return QValidator::Invalid;
+
+    unsigned strpos = prefix.length();
+
+    // Empty "numbers" allowed as intermediate values
+    if (strpos >= input.length() - HasSign() - suffix.length())
+        return QValidator::Intermediate;
+
+    _dbg_assert_(GUI, base <= 10 || base == 16);
+    QString regexp;
+
+    // Demand sign character for negative ranges
+    if (HasSign())
+        regexp += "[+\\-]";
+
+    // Match digits corresponding to the chosen number base.
+    regexp += QString("[0-%1").arg(std::min(base, 9));
+    if (base == 16) {
+        regexp += "a-fA-F";
+    }
+    regexp += "]";
+
+    // Specify number of digits
+    if (num_digits > 0) {
+        regexp += QString("{%1}").arg(num_digits);
+    } else {
+        regexp += "+";
+    }
+
+    // Match string
+    QRegExp num_regexp(regexp);
+    int num_pos = strpos;
+    QString sub_input = input.mid(strpos, input.length() - strpos - suffix.length());
+
+    if (!num_regexp.exactMatch(sub_input) && num_regexp.matchedLength() == 0)
+        return QValidator::Invalid;
+
+    sub_input = sub_input.left(num_regexp.matchedLength());
+    bool ok;
+    qint64 val = sub_input.toLongLong(&ok, base);
+
+    if (!ok)
+        return QValidator::Invalid;
+
+    // Outside boundaries => don't accept
+    if (val < min_value || val > max_value)
+        return QValidator::Invalid;
+
+    // Make sure we are actually at the end of this string...
+    strpos += num_regexp.matchedLength();
+
+    if (!suffix.isEmpty() && input.mid(strpos) != suffix) {
+        return QValidator::Invalid;
+    } else {
+        strpos += suffix.length();
+    }
+
+    if (strpos != input.length())
+        return QValidator::Invalid;
+
+    // At this point we can say for sure that the input is fine. Let's fix it up a bit though
+    input.replace(num_pos, sub_input.length(), sub_input.toUpper());
+
+    return QValidator::Acceptable;
+}
diff --git a/src/citra_qt/util/spinbox.hxx b/src/citra_qt/util/spinbox.hxx
new file mode 100644
index 000000000..68f5b9894
--- /dev/null
+++ b/src/citra_qt/util/spinbox.hxx
@@ -0,0 +1,88 @@
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+
+// Copyright 2014 Tony Wasserka
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above copyright
+//       notice, this list of conditions and the following disclaimer in the
+//       documentation and/or other materials provided with the distribution.
+//     * Neither the name of the owner nor the names of its contributors may
+//       be used to endorse or promote products derived from this software
+//       without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+#pragma once
+
+#include <QAbstractSpinBox>
+#include <QtGlobal>
+
+class QVariant;
+
+/**
+ * A custom spin box widget with enhanced functionality over Qt's QSpinBox
+ */
+class CSpinBox : public QAbstractSpinBox {
+    Q_OBJECT
+
+public:
+    CSpinBox(QWidget* parent = nullptr);
+
+    void stepBy(int steps) override;
+    StepEnabled stepEnabled() const override;
+
+    void SetValue(qint64 val);
+
+    void SetRange(qint64 min, qint64 max);
+
+    void SetBase(int base);
+
+    void SetPrefix(const QString& prefix);
+    void SetSuffix(const QString& suffix);
+
+    void SetNumDigits(int num_digits);
+
+    QValidator::State validate(QString& input, int& pos) const override;
+
+signals:
+    void ValueChanged(qint64 val);
+
+private slots:
+    void OnEditingFinished();
+
+private:
+    void UpdateText();
+
+    bool HasSign() const;
+
+    QString TextFromValue();
+    qint64 ValueFromText();
+
+    qint64 min_value, max_value;
+
+    qint64 value;
+
+    QString prefix, suffix;
+
+    int base;
+
+    int num_digits;
+};
diff --git a/src/common/common_funcs.h b/src/common/common_funcs.h
index 1139dc3b8..db041780a 100644
--- a/src/common/common_funcs.h
+++ b/src/common/common_funcs.h
@@ -4,6 +4,8 @@
 
 #pragma once
 
+#include "common_types.h"
+
 #ifdef _WIN32
 #define SLEEP(x) Sleep(x)
 #else
@@ -37,6 +39,8 @@ template<> struct CompileTimeAssert<true> {};
 #include <sys/endian.h>
 #endif
 
+#include "common_types.h"
+
 // go to debugger mode
     #ifdef GEKKO
         #define Crash()
@@ -73,6 +77,8 @@ inline u64 _rotr64(u64 x, unsigned int shift){
 }
 
 #else // WIN32
+#include <locale.h>
+
 // Function Cross-Compatibility
     #define strcasecmp _stricmp
     #define strncasecmp _strnicmp
diff --git a/src/common/log.h b/src/common/log.h
index 14ad98c08..ff0295cb0 100644
--- a/src/common/log.h
+++ b/src/common/log.h
@@ -4,6 +4,9 @@
 
 #pragma once
 
+#include "common/common_funcs.h"
+#include "common/msg_handler.h"
+
 #ifndef LOGGING
 #define LOGGING
 #endif
diff --git a/src/video_core/command_processor.cpp b/src/video_core/command_processor.cpp
index 8a6ba2560..298b04c51 100644
--- a/src/video_core/command_processor.cpp
+++ b/src/video_core/command_processor.cpp
@@ -34,6 +34,9 @@ static inline void WritePicaReg(u32 id, u32 value, u32 mask) {
     u32 old_value = registers[id];
     registers[id] = (old_value & ~mask) | (value & mask);
 
+    if (g_debug_context)
+        g_debug_context->OnEvent(DebugContext::Event::CommandLoaded, reinterpret_cast<void*>(&id));
+
     DebugUtils::OnPicaRegWrite(id, registers[id]);
 
     switch(id) {
@@ -43,6 +46,9 @@ static inline void WritePicaReg(u32 id, u32 value, u32 mask) {
         {
             DebugUtils::DumpTevStageConfig(registers.GetTevStages());
 
+            if (g_debug_context)
+                g_debug_context->OnEvent(DebugContext::Event::IncomingPrimitiveBatch, nullptr);
+
             const auto& attribute_config = registers.vertex_attributes;
             const u8* const base_address = Memory::GetPointer(attribute_config.GetBaseAddress());
 
@@ -132,6 +138,10 @@ static inline void WritePicaReg(u32 id, u32 value, u32 mask) {
                 clipper_primitive_assembler.SubmitVertex(output, Clipper::ProcessTriangle);
             }
             geometry_dumper.Dump();
+
+            if (g_debug_context)
+                g_debug_context->OnEvent(DebugContext::Event::FinishedPrimitiveBatch, nullptr);
+
             break;
         }
 
@@ -229,6 +239,9 @@ static inline void WritePicaReg(u32 id, u32 value, u32 mask) {
         default:
             break;
     }
+
+    if (g_debug_context)
+        g_debug_context->OnEvent(DebugContext::Event::CommandProcessed, reinterpret_cast<void*>(&id));
 }
 
 static std::ptrdiff_t ExecuteCommandBlock(const u32* first_command_word) {
diff --git a/src/video_core/debug_utils/debug_utils.cpp b/src/video_core/debug_utils/debug_utils.cpp
index 8a5f11424..71b03f31c 100644
--- a/src/video_core/debug_utils/debug_utils.cpp
+++ b/src/video_core/debug_utils/debug_utils.cpp
@@ -3,6 +3,8 @@
 // Refer to the license.txt file included.
 
 #include <algorithm>
+#include <condition_variable>
+#include <list>
 #include <map>
 #include <fstream>
 #include <mutex>
@@ -12,14 +14,56 @@
 #include <png.h>
 #endif
 
+#include "common/log.h"
 #include "common/file_util.h"
 
+#include "video_core/math.h"
 #include "video_core/pica.h"
 
 #include "debug_utils.h"
 
 namespace Pica {
 
+void DebugContext::OnEvent(Event event, void* data) {
+    if (!breakpoints[event].enabled)
+        return;
+
+    {
+        std::unique_lock<std::mutex> lock(breakpoint_mutex);
+
+        // TODO: Should stop the CPU thread here once we multithread emulation.
+
+        active_breakpoint = event;
+        at_breakpoint = true;
+
+        // Tell all observers that we hit a breakpoint
+        for (auto& breakpoint_observer : breakpoint_observers) {
+            breakpoint_observer->OnPicaBreakPointHit(event, data);
+        }
+
+        // Wait until another thread tells us to Resume()
+        resume_from_breakpoint.wait(lock, [&]{ return !at_breakpoint; });
+    }
+}
+
+void DebugContext::Resume() {
+    {
+        std::unique_lock<std::mutex> lock(breakpoint_mutex);
+
+        // Tell all observers that we are about to resume
+        for (auto& breakpoint_observer : breakpoint_observers) {
+            breakpoint_observer->OnPicaResume();
+        }
+
+        // Resume the waiting thread (i.e. OnEvent())
+        at_breakpoint = false;
+    }
+
+    resume_from_breakpoint.notify_one();
+}
+
+std::shared_ptr<DebugContext> g_debug_context; // TODO: Get rid of this global
+
 namespace DebugUtils {
 
 void GeometryDumper::AddTriangle(Vertex& v0, Vertex& v1, Vertex& v2) {
@@ -312,6 +356,42 @@ std::unique_ptr<PicaTrace> FinishPicaTracing()
     return std::move(ret);
 }
 
+const Math::Vec4<u8> LookupTexture(const u8* source, int x, int y, const TextureInfo& info) {
+    _dbg_assert_(GPU, info.format == Pica::Regs::TextureFormat::RGB8);
+
+    // Cf. rasterizer code for an explanation of this algorithm.
+    int texel_index_within_tile = 0;
+    for (int block_size_index = 0; block_size_index < 3; ++block_size_index) {
+        int sub_tile_width = 1 << block_size_index;
+        int sub_tile_height = 1 << block_size_index;
+
+        int sub_tile_index = (x & sub_tile_width) << block_size_index;
+        sub_tile_index += 2 * ((y & sub_tile_height) << block_size_index);
+        texel_index_within_tile += sub_tile_index;
+    }
+
+    const int block_width = 8;
+    const int block_height = 8;
+
+    int coarse_x = (x / block_width) * block_width;
+    int coarse_y = (y / block_height) * block_height;
+
+    const u8* source_ptr = source + coarse_x * block_height * 3 + coarse_y * info.stride + texel_index_within_tile * 3;
+    return { source_ptr[2], source_ptr[1], source_ptr[0], 255 };
+}
+
+TextureInfo TextureInfo::FromPicaRegister(const Regs::TextureConfig& config,
+                                          const Regs::TextureFormat& format)
+{
+    TextureInfo info;
+    info.address = config.GetPhysicalAddress();
+    info.width = config.width;
+    info.height = config.height;
+    info.format = format;
+    info.stride = Pica::Regs::BytesPerPixel(info.format) * info.width;
+    return info;
+}
+
 void DumpTexture(const Pica::Regs::TextureConfig& texture_config, u8* data) {
     // NOTE: Permanently enabling this just trashes hard disks for no reason.
     //       Hence, this is currently disabled.
@@ -377,27 +457,15 @@ void DumpTexture(const Pica::Regs::TextureConfig& texture_config, u8* data) {
     buf = new u8[row_stride * texture_config.height];
     for (unsigned y = 0; y < texture_config.height; ++y) {
         for (unsigned x = 0; x < texture_config.width; ++x) {
-            // Cf. rasterizer code for an explanation of this algorithm.
-            int texel_index_within_tile = 0;
-            for (int block_size_index = 0; block_size_index < 3; ++block_size_index) {
-                int sub_tile_width = 1 << block_size_index;
-                int sub_tile_height = 1 << block_size_index;
-
-                int sub_tile_index = (x & sub_tile_width) << block_size_index;
-                sub_tile_index += 2 * ((y & sub_tile_height) << block_size_index);
-                texel_index_within_tile += sub_tile_index;
-            }
-
-            const int block_width = 8;
-            const int block_height = 8;
-
-            int coarse_x = (x / block_width) * block_width;
-            int coarse_y = (y / block_height) * block_height;
-
-            u8* source_ptr = (u8*)data + coarse_x * block_height * 3 + coarse_y * row_stride + texel_index_within_tile * 3;
-            buf[3 * x + y * row_stride    ] = source_ptr[2];
-            buf[3 * x + y * row_stride + 1] = source_ptr[1];
-            buf[3 * x + y * row_stride + 2] = source_ptr[0];
+            TextureInfo info;
+            info.width = texture_config.width;
+            info.height = texture_config.height;
+            info.stride = row_stride;
+            info.format = registers.texture0_format;
+            Math::Vec4<u8> texture_color = LookupTexture(data, x, y, info);
+            buf[3 * x + y * row_stride    ] = texture_color.r();
+            buf[3 * x + y * row_stride + 1] = texture_color.g();
+            buf[3 * x + y * row_stride + 2] = texture_color.b();
         }
     }
 
diff --git a/src/video_core/debug_utils/debug_utils.h b/src/video_core/debug_utils/debug_utils.h
index b1558cfae..51f14f12f 100644
--- a/src/video_core/debug_utils/debug_utils.h
+++ b/src/video_core/debug_utils/debug_utils.h
@@ -5,13 +5,147 @@
 #pragma once
 
 #include <array>
+#include <condition_variable>
+#include <list>
+#include <map>
 #include <memory>
+#include <mutex>
 #include <vector>
 
+#include "video_core/math.h"
 #include "video_core/pica.h"
 
 namespace Pica {
 
+class DebugContext {
+public:
+    enum class Event {
+        FirstEvent = 0,
+
+        CommandLoaded = FirstEvent,
+        CommandProcessed,
+        IncomingPrimitiveBatch,
+        FinishedPrimitiveBatch,
+
+        NumEvents
+    };
+
+    /**
+     * Inherit from this class to be notified of events registered to some debug context.
+     * Most importantly this is used for our debugger GUI.
+     *
+     * To implement event handling, override the OnPicaBreakPointHit and OnPicaResume methods.
+     * @warning All BreakPointObservers need to be on the same thread to guarantee thread-safe state access
+     * @todo Evaluate an alternative interface, in which there is only one managing observer and multiple child observers running (by design) on the same thread.
+     */
+    class BreakPointObserver {
+    public:
+        /// Constructs the object such that it observes events of the given DebugContext.
+        BreakPointObserver(std::shared_ptr<DebugContext> debug_context) : context_weak(debug_context) {
+            std::unique_lock<std::mutex> lock(debug_context->breakpoint_mutex);
+            debug_context->breakpoint_observers.push_back(this);
+        }
+
+        virtual ~BreakPointObserver() {
+            auto context = context_weak.lock();
+            if (context) {
+                std::unique_lock<std::mutex> lock(context->breakpoint_mutex);
+                context->breakpoint_observers.remove(this);
+
+                // If we are the last observer to be destroyed, tell the debugger context that
+                // it is free to continue. In particular, this is required for a proper Citra
+                // shutdown, when the emulation thread is waiting at a breakpoint.
+                if (context->breakpoint_observers.empty())
+                    context->Resume();
+            }
+        }
+
+        /**
+         * Action to perform when a breakpoint was reached.
+         * @param event Type of event which triggered the breakpoint
+         * @param data Optional data pointer (if unused, this is a nullptr)
+         * @note This function will perform nothing unless it is overridden in the child class.
+         */
+        virtual void OnPicaBreakPointHit(Event, void*) {
+        }
+
+        /**
+         * Action to perform when emulation is resumed from a breakpoint.
+         * @note This function will perform nothing unless it is overridden in the child class.
+         */
+        virtual void OnPicaResume() {
+        }
+
+    protected:
+        /**
+         * Weak context pointer. This need not be valid, so when requesting a shared_ptr via
+         * context_weak.lock(), always compare the result against nullptr.
+         */
+        std::weak_ptr<DebugContext> context_weak;
+    };
+
+    /**
+     * Simple structure defining a breakpoint state
+     */
+    struct BreakPoint {
+        bool enabled = false;
+    };
+
+    /**
+     * Static constructor used to create a shared_ptr of a DebugContext.
+     */
+    static std::shared_ptr<DebugContext> Construct() {
+        return std::shared_ptr<DebugContext>(new DebugContext);
+    }
+
+    /**
+     * Used by the emulation core when a given event has happened. If a breakpoint has been set
+     * for this event, OnEvent calls the event handlers of the registered breakpoint observers.
+     * The current thread then is halted until Resume() is called from another thread (or until
+     * emulation is stopped).
+     * @param event Event which has happened
+     * @param data Optional data pointer (pass nullptr if unused). Needs to remain valid until Resume() is called.
+     */
+    void OnEvent(Event event, void* data);
+
+    /**
+     * Resume from the current breakpoint.
+     * @warning Calling this from the same thread that OnEvent was called in will cause a deadlock. Calling from any other thread is safe.
+     */
+    void Resume();
+
+    /**
+     * Delete all set breakpoints and resume emulation.
+     */
+    void ClearBreakpoints() {
+        breakpoints.clear();
+        Resume();
+    }
+
+    // TODO: Evaluate if access to these members should be hidden behind a public interface.
+    std::map<Event, BreakPoint> breakpoints;
+    Event active_breakpoint;
+    bool at_breakpoint = false;
+
+private:
+    /**
+     * Private default constructor to make sure people always construct this through Construct()
+     * instead.
+     */
+    DebugContext() = default;
+
+    /// Mutex protecting current breakpoint state and the observer list.
+    std::mutex breakpoint_mutex;
+
+    /// Used by OnEvent to wait for resumption.
+    std::condition_variable resume_from_breakpoint;
+
+    /// List of registered observers
+    std::list<BreakPointObserver*> breakpoint_observers;
+};
+
+extern std::shared_ptr<DebugContext> g_debug_context; // TODO: Get rid of this global
+
 namespace DebugUtils {
 
 // Simple utility class for dumping geometry data to an OBJ file
@@ -57,6 +191,18 @@ bool IsPicaTracing();
 void OnPicaRegWrite(u32 id, u32 value);
 std::unique_ptr<PicaTrace> FinishPicaTracing();
 
+struct TextureInfo {
+    unsigned int address;
+    int width;
+    int height;
+    int stride;
+    Pica::Regs::TextureFormat format;
+
+    static TextureInfo FromPicaRegister(const Pica::Regs::TextureConfig& config,
+                                        const Pica::Regs::TextureFormat& format);
+};
+
+const Math::Vec4<u8> LookupTexture(const u8* source, int x, int y, const TextureInfo& info);
 void DumpTexture(const Pica::Regs::TextureConfig& texture_config, u8* data);
 
 void DumpTevStageConfig(const std::array<Pica::Regs::TevStageConfig,6>& stages);
diff --git a/src/video_core/pica.h b/src/video_core/pica.h
index 5fe15a218..e7ca38978 100644
--- a/src/video_core/pica.h
+++ b/src/video_core/pica.h
@@ -109,7 +109,7 @@ struct Regs {
 
         u32 address;
 
-        u32 GetPhysicalAddress() {
+        u32 GetPhysicalAddress() const {
             return DecodeAddressRegister(address) - Memory::FCRAM_PADDR + Memory::HEAP_GSP_VADDR;
         }
 
@@ -130,7 +130,26 @@ struct Regs {
         // Seems like they are luminance formats and compressed textures.
     };
 
-    BitField<0, 1, u32> texturing_enable;
+    static unsigned BytesPerPixel(TextureFormat format) {
+        switch (format) {
+        case TextureFormat::RGBA8:
+            return 4;
+
+        case TextureFormat::RGB8:
+            return 3;
+
+        case TextureFormat::RGBA5551:
+        case TextureFormat::RGB565:
+        case TextureFormat::RGBA4:
+            return 2;
+
+        default:
+            // placeholder for yet unknown formats
+            return 1;
+        }
+    }
+
+    BitField< 0, 1, u32> texturing_enable;
     TextureConfig texture0;
     INSERT_PADDING_WORDS(0x8);
     BitField<0, 4, TextureFormat> texture0_format;
@@ -517,10 +536,6 @@ struct Regs {
     static std::string GetCommandName(int index) {
         std::map<u32, std::string> map;
 
-        // TODO: MSVC does not support using offsetof() on non-static data members even though this
-        //       is technically allowed since C++11. Hence, this functionality is disabled until
-        //       MSVC properly supports it.
-        #ifndef _MSC_VER
         Regs regs;
         #define ADD_FIELD(name)                                                                               \
             do {                                                                                              \
@@ -557,7 +572,6 @@ struct Regs {
         ADD_FIELD(vs_swizzle_patterns);
 
         #undef ADD_FIELD
-        #endif // _MSC_VER
 
         // Return empty string if no match is found
         return map[index];