1 files changed, 43 insertions, 3 deletions

diff --git a/qtmips_gui/cop0dock.cpp b/qtmips_gui/cop0dock.cpp
index 1070444..9e35d6b 100644
--- a/qtmips_gui/cop0dock.cpp
+++ b/qtmips_gui/cop0dock.cpp
@@ -50,14 +50,24 @@ Cop0Dock::Cop0Dock(QWidget *parent) : QDockWidget(parent) {
     } while(false)
 
     cop0reg[0] = nullptr;
-    for (int i = 1; i < machine::Cop0State::COP0REGS_CNT; i++)
+    for (int i = 1; i < machine::Cop0State::COP0REGS_CNT; i++) {
         INIT(cop0reg[i], machine::Cop0State::cop0reg_name((machine::Cop0State::Cop0Registers)i));
+        cop0reg_highlighted[i] = false;
+    }
 #undef INIT
     scrollarea->setWidget(widg);
 
     setWidget(scrollarea);
     setObjectName("Coprocessor0");
     setWindowTitle("Coprocessor0");
+
+    pal_normal = QPalette(cop0reg[1]->palette());
+    pal_updated = QPalette(cop0reg[1]->palette());
+    pal_read = QPalette(cop0reg[1]->palette());
+    pal_normal.setColor(QPalette::WindowText, QColor(0, 0, 0));
+    pal_updated.setColor(QPalette::WindowText, QColor(240, 0, 0));
+    pal_read.setColor(QPalette::WindowText, QColor(0, 0, 240));
+    cop0reg_highlighted_any = false;
 }
 
 Cop0Dock::~Cop0Dock() {
@@ -76,11 +86,15 @@ void Cop0Dock::setup(machine::QtMipsMachine *machine) {
     }
 
     const machine::Cop0State *cop0state = machine->cop0state();
-    connect(cop0state, &machine::Cop0State::cop0reg_update,
-            this, &Cop0Dock::cop0reg_changed);
 
     for (int i = 1; i < machine::Cop0State::COP0REGS_CNT; i++)
         labelVal(cop0reg[i], cop0state->read_cop0reg((machine::Cop0State::Cop0Registers)i));
+
+    connect(cop0state, &machine::Cop0State::cop0reg_update,
+            this, &Cop0Dock::cop0reg_changed);
+    connect(cop0state, &machine::Cop0State::cop0reg_read,
+            this, &Cop0Dock::cop0reg_read);
+    connect(machine, SIGNAL(tick()), this, SLOT(clear_highlights()));
 }
 
 void Cop0Dock::cop0reg_changed(enum machine::Cop0State::Cop0Registers reg, std::uint32_t val) {
@@ -88,6 +102,32 @@ void Cop0Dock::cop0reg_changed(enum machine::Cop0State::Cop0Registers reg, std::
                   QString("Cop0Dock received signal with invalid cop0 register: ") +
                   QString::number((uint)reg));
     labelVal(cop0reg[(uint)reg], val);
+    cop0reg[reg]->setPalette(pal_updated);
+    cop0reg_highlighted[reg] = true;
+    cop0reg_highlighted_any = true;
+}
+
+void Cop0Dock::cop0reg_read(enum machine::Cop0State::Cop0Registers reg, std::uint32_t val) {
+    (void)val;
+    SANITY_ASSERT((uint)reg < machine::Cop0State::COP0REGS_CNT && (uint)reg,
+                  QString("Cop0Dock received signal with invalid cop0 register: ") +
+                  QString::number((uint)reg));
+    if (!cop0reg_highlighted[reg])
+        cop0reg[reg]->setPalette(pal_read);
+    cop0reg_highlighted[reg] = true;
+    cop0reg_highlighted_any = true;
+}
+
+void Cop0Dock::clear_highlights() {
+    if (!cop0reg_highlighted_any)
+        return;
+    for (int i = 1; i < machine::Cop0State::COP0REGS_CNT; i++) {
+        if (cop0reg_highlighted[i]) {
+            cop0reg[i]->setPalette(pal_normal);
+            cop0reg_highlighted[i] = false;
+        }
+    }
+    cop0reg_highlighted_any = false;
 }
 
 void Cop0Dock::labelVal(QLabel *label, std::uint32_t value) {