From 051149e5026ff64f3ec477cf19080124b82de619 Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Thu, 11 Sep 2014 12:37:22 +0300
Subject: [PATCH] Add a game controller input device

Currently only implemented for Linux.
---
 Build                                        |  4 +
 source/input/gamecontroller.h                | 26 +++++++
 source/input/linux/gamecontroller.cpp        | 80 ++++++++++++++++++++
 source/input/linux/gamecontroller_platform.h | 37 +++++++++
 4 files changed, 147 insertions(+)
 create mode 100644 source/input/gamecontroller.h
 create mode 100644 source/input/linux/gamecontroller.cpp
 create mode 100644 source/input/linux/gamecontroller_platform.h

diff --git a/Build b/Build
index 7972020..5ff4f78 100644
--- a/Build
+++ b/Build
@@ -104,6 +104,10 @@ package "mspgui"
 		{
 			source "source/graphics/devil";
 		};
+		if_arch "linux"
+		{
+			overlay "linux";
+		};
 		if_arch "windows"
 		{
 			overlay "windows";
diff --git a/source/input/gamecontroller.h b/source/input/gamecontroller.h
new file mode 100644
index 0000000..9ebacee
--- /dev/null
+++ b/source/input/gamecontroller.h
@@ -0,0 +1,26 @@
+#ifndef GAMECONTROLLER_H_
+#define GAMECONTROLLER_H_
+
+#include "device.h"
+
+namespace Msp {
+namespace Input {
+
+class GameController: public Device
+{
+private:
+	struct Private;
+
+	Private *priv;
+
+public:
+	GameController(unsigned);
+	virtual ~GameController();
+
+	void tick();
+};
+
+} // namespace Input
+} // namespace Msp
+
+#endif
diff --git a/source/input/linux/gamecontroller.cpp b/source/input/linux/gamecontroller.cpp
new file mode 100644
index 0000000..bf69049
--- /dev/null
+++ b/source/input/linux/gamecontroller.cpp
@@ -0,0 +1,80 @@
+#include <fcntl.h>
+#include <linux/joystick.h>
+#include <msp/core/systemerror.h>
+#include <msp/io/handle_private.h>
+#include <msp/strings/format.h>
+#include "gamecontroller.h"
+#include "gamecontroller_platform.h"
+
+using namespace std;
+
+namespace Msp {
+namespace Input {
+
+GameController::GameController(unsigned index):
+	priv(new Private)
+{
+	priv->dev = new JsDevice(format("/dev/input/js%d", index));
+	name = priv->dev->get_name();
+	tick();
+}
+
+GameController::~GameController()
+{
+	delete priv->dev;
+	delete priv;
+}
+
+void GameController::tick()
+{
+	js_event events[16];
+	while(1)
+	{
+		unsigned len = priv->dev->read(reinterpret_cast<char *>(events), sizeof(events));
+
+		unsigned count = len/sizeof(js_event);
+		for(unsigned i=0; i<count; ++i)
+		{
+			unsigned type = events[i].type&0x7F;
+			bool init = events[i].type&JS_EVENT_INIT;
+			if(type==JS_EVENT_AXIS)
+				set_axis_value(events[i].number, events[i].value/32768.0f, !init);
+			else if(type==JS_EVENT_BUTTON)
+				set_button_state(events[i].number, events[i].value, !init);
+		}
+
+		if(len<sizeof(events))
+			break;
+	}
+}
+
+
+JsDevice::JsDevice(const string &fn)
+{
+	mode = IO::M_READ;
+	*handle = open(fn.c_str(), O_RDONLY|O_NONBLOCK);
+	if(!handle)
+		throw system_error(format("open(%s)", fn));
+}
+
+string JsDevice::get_name() const
+{
+	char buf[128];
+	int ret = ioctl(*handle, JSIOCGNAME(sizeof(buf)), buf);
+	if(ret<0)
+		throw system_error("ioctl(JSIOCGNAME)");
+	return buf;
+}
+
+unsigned JsDevice::do_read(char *buf, unsigned size)
+{
+	return IO::sys_read(handle, buf, size);
+}
+
+unsigned JsDevice::do_write(const char *, unsigned)
+{
+	throw IO::invalid_access(IO::M_WRITE);
+}
+
+} // namespace Input
+} // namespace Msp
diff --git a/source/input/linux/gamecontroller_platform.h b/source/input/linux/gamecontroller_platform.h
new file mode 100644
index 0000000..61bcdb5
--- /dev/null
+++ b/source/input/linux/gamecontroller_platform.h
@@ -0,0 +1,37 @@
+#ifndef GAMECONTROLLER_PRIVATE_H_
+#define GAMECONTROLLER_PRIVATE_H_
+
+#include <msp/io/eventobject.h>
+#include <msp/io/handle.h>
+
+namespace Msp {
+namespace Input {
+
+class JsDevice: public IO::EventObject
+{
+private:
+	IO::Handle handle;
+
+public:
+	JsDevice(const std::string &);
+
+	std::string get_name() const;
+
+protected:
+	virtual unsigned do_read(char *, unsigned);
+	virtual unsigned do_write(const char *, unsigned);
+
+public:
+	virtual const IO::Handle &get_event_handle() { return handle; }
+};
+
+
+struct GameController::Private
+{
+	JsDevice *dev;
+};
+
+} // namespace Input
+} // namespace Msp
+
+#endif
-- 
2.43.0