Imported existing sources

nescorelib/emu/interrupts.cpp

@@ -0,0 +1,69 @@
+#include "interrupts.h"
+
+// Qt includes
+#include <QDataStream>
+
+// local includes
+#include "nesemulator.h"
+
+Interrupts::Interrupts(NesEmulator &emu) :
+    m_emu(emu)
+{
+}
+
+void Interrupts::pollStatus()
+{
+    if(!m_emu.cpu().suspendNmi())
+    {
+        //The edge detector, see ifnmi occurred.
+        if(m_ppuNmiCurrent && !m_ppuNmiOld) //Raising edge, set nmi request
+            m_emu.cpu().setNmiPin(true);
+        m_ppuNmiCurrent = false; //NMI detected or not, low both lines forthis form ___|-|__
+        m_ppuNmiOld = false;
+    }
+
+    if(!m_emu.cpu().suspendIrq())
+        m_emu.cpu().setIrqPin(!m_emu.cpu().flagI() && m_flags); // irq level detector
+
+    m_vector = m_emu.cpu().nmiPin() ? 0xFFFA : 0xFFFE;
+}
+
+void Interrupts::writeState(QDataStream &dataStream) const
+{
+    dataStream << m_flags << m_ppuNmiCurrent << m_ppuNmiOld << m_vector;
+}
+
+void Interrupts::readState(QDataStream &dataStream)
+{
+    dataStream >> m_flags >> m_ppuNmiCurrent >> m_ppuNmiOld >> m_vector;
+}
+
+qint32 Interrupts::flags() const
+{
+    return m_flags;
+}
+
+void Interrupts::addFlag(IrqFlag flag)
+{
+    m_flags |= flag;
+}
+
+void Interrupts::removeFlag(IrqFlag flag)
+{
+    m_flags &= ~flag;
+}
+
+void Interrupts::setFlags(qint32 flags)
+{
+    m_flags = flags;
+}
+
+quint16 Interrupts::vector() const
+{
+    return m_vector;
+}
+
+void Interrupts::setNmiCurrent(bool nmiCurrent)
+{
+    m_ppuNmiCurrent = nmiCurrent;
+}