EightBit/inc/Device.h
Adrian Conlon 759b4a9fa8 GameBoy: Correct a few (very minor C++) niggles in the implementation. No functional changes.
Signed-off-by: Adrian Conlon <adrian.conlon@gmail.com>
2020-11-07 09:41:12 +00:00

111 lines
3.0 KiB
C++

#pragma once
#include "EventArgs.h"
#include "Signal.h"
#define DECLARE_PIN_SIGNALS(name) \
Signal<EventArgs> Raising ## name; \
Signal<EventArgs> Raised ## name; \
Signal<EventArgs> Lowering ## name; \
Signal<EventArgs> Lowered ## name;
#define DECLARE_PIN_LEVEL_RAISE(name) \
virtual void raise ## name();
#define DECLARE_PIN_LEVEL_LOWER(name) \
virtual void lower ## name();
#define DECLARE_PIN_LEVEL_CHANGERS(name) \
DECLARE_PIN_LEVEL_RAISE(name) \
DECLARE_PIN_LEVEL_LOWER(name)
#define DEFINE_PIN_LEVEL_RAISE(name, within) \
void EightBit:: within ::raise ## name() { \
if (lowered( name ())) { \
Raising ## name.fire(EventArgs::empty()); \
raise( name ()); \
Raised ## name.fire(EventArgs::empty()); \
} \
}
#define DEFINE_PIN_LEVEL_LOWER(name, within) \
void EightBit:: within ::lower ## name() { \
if (raised( name ())) { \
Lowering ## name.fire(EventArgs::empty()); \
lower( name ()); \
Lowered ## name.fire(EventArgs::empty()); \
} \
}
#define DEFINE_PIN_LEVEL_CHANGERS(name, within) \
DEFINE_PIN_LEVEL_RAISE(name, within) \
DEFINE_PIN_LEVEL_LOWER(name, within)
#define DECLARE_PIN_MEMBER(name) \
PinLevel m_## name ## _Line = PinLevel::Low;
#define DEFINE_PIN_ACTIVATOR(name, on, off) \
template <class T> class _Activate ## name final { \
T& m_parent; \
public: \
_Activate ## name(T& parent) \
: m_parent(parent) { \
m_parent. on ## name(); \
} \
~_Activate ## name() { \
m_parent. off ## name(); \
} \
};
#define DEFINE_PIN_ACTIVATOR_LOW(name) \
DEFINE_PIN_ACTIVATOR(name, lower, raise)
#define DEFINE_PIN_ACTIVATOR_HIGH(name) \
DEFINE_PIN_ACTIVATOR(name, raise, lower)
#define DECLARE_PIN(name, visibility) \
public: \
DECLARE_PIN_SIGNALS(name) \
[[nodiscard]] PinLevel& name () noexcept { \
return m_## name ## _Line; \
} \
visibility : \
DECLARE_PIN_LEVEL_CHANGERS(name) \
private: \
DECLARE_PIN_MEMBER(name)
// Input pins may be external controlled
#define DECLARE_PIN_INPUT(name) \
DECLARE_PIN(name, public)
// Output pins can only be internally controlled
#define DECLARE_PIN_OUTPUT(name) \
DECLARE_PIN(name, protected)
namespace EightBit {
class Device {
public:
enum class PinLevel {
Low, High
};
[[nodiscard]] static constexpr auto raised(const PinLevel line) { return line == PinLevel::High; }
static void raise(PinLevel& line) noexcept { line = PinLevel::High; }
[[nodiscard]] static constexpr auto lowered(const PinLevel line) { return line == PinLevel::Low; }
static void lower(PinLevel& line) noexcept { line = PinLevel::Low; }
static void match(PinLevel& line, int condition) noexcept { match(line, condition != 0); }
static void match(PinLevel& line, bool condition) noexcept { condition ? raise(line) : lower(line); }
static void match(PinLevel& out, PinLevel in) noexcept { out = in; }
virtual ~Device() = default;
[[nodiscard]] bool powered() noexcept { return raised(POWER()); }
DECLARE_PIN_INPUT(POWER)
protected:
Device() noexcept = default;
};
}