glfw/src/x11/x11_joystick.c
2010-09-25 19:26:57 +02:00

353 lines
11 KiB
C

//========================================================================
// GLFW - An OpenGL framework
// Platform: X11/GLX
// API version: 3.0
// WWW: http://www.glfw.org/
//------------------------------------------------------------------------
// Copyright (c) 2002-2006 Marcus Geelnard
// Copyright (c) 2006-2010 Camilla Berglund <elmindreda@elmindreda.org>
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would
// be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not
// be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source
// distribution.
//
//========================================================================
#include "internal.h"
//========================================================================
// Note: Only Linux joystick input is supported at the moment. Other
// systems will behave as if there are no joysticks connected.
//========================================================================
#ifdef _GLFW_USE_LINUX_JOYSTICKS
//------------------------------------------------------------------------
// Here are the Linux joystick driver v1.x interface definitions that we
// use (we do not want to rely on <linux/joystick.h>):
//------------------------------------------------------------------------
#include <sys/ioctl.h>
#include <fcntl.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
// Joystick event types
#define JS_EVENT_BUTTON 0x01 /* button pressed/released */
#define JS_EVENT_AXIS 0x02 /* joystick moved */
#define JS_EVENT_INIT 0x80 /* initial state of device */
// Joystick event structure
struct js_event {
unsigned int time; /* (u32) event timestamp in milliseconds */
signed short value; /* (s16) value */
unsigned char type; /* (u8) event type */
unsigned char number; /* (u8) axis/button number */
};
// Joystick IOCTL commands
#define JSIOCGVERSION _IOR('j', 0x01, int) /* get driver version (u32) */
#define JSIOCGAXES _IOR('j', 0x11, char) /* get number of axes (u8) */
#define JSIOCGBUTTONS _IOR('j', 0x12, char) /* get number of buttons (u8) */
#endif // _GLFW_USE_LINUX_JOYSTICKS
//////////////////////////////////////////////////////////////////////////
////// GLFW internal API //////
//////////////////////////////////////////////////////////////////////////
//========================================================================
// Initialize joystick interface
//========================================================================
void _glfwInitJoysticks(void)
{
#ifdef _GLFW_USE_LINUX_JOYSTICKS
int k, n, fd, joy_count;
char* joy_base_name;
char joy_dev_name[20];
int driver_version = 0x000800;
char ret_data;
#endif // _GLFW_USE_LINUX_JOYSTICKS
int i;
// Start by saying that there are no sticks
for (i = 0; i <= GLFW_JOYSTICK_LAST; i++)
_glfwJoy[i].Present = GL_FALSE;
#ifdef _GLFW_USE_LINUX_JOYSTICKS
// Try to open joysticks (nonblocking)
joy_count = 0;
for (k = 0; k <= 1 && joy_count <= GLFW_JOYSTICK_LAST; k++)
{
// Pick joystick base name
switch (k)
{
case 0:
// USB joysticks
joy_base_name = "/dev/input/js";
break;
case 1:
// "Legacy" joysticks
joy_base_name = "/dev/js";
break;
default:
// This should never happen
continue;
}
// Try to open a few of these sticks
for (i = 0; i <= 50 && joy_count <= GLFW_JOYSTICK_LAST; i++)
{
sprintf(joy_dev_name, "%s%d", joy_base_name, i);
fd = open(joy_dev_name, O_NONBLOCK);
if (fd != -1)
{
// Remember fd
_glfwJoy[joy_count].fd = fd;
// Check that the joystick driver version is 1.0+
ioctl(fd, JSIOCGVERSION, &driver_version);
if (driver_version < 0x010000)
{
// It's an old 0.x interface (we don't support it)
close(fd);
continue;
}
// Get number of joystick axes
ioctl(fd, JSIOCGAXES, &ret_data);
_glfwJoy[joy_count].NumAxes = (int) ret_data;
// Get number of joystick buttons
ioctl(fd, JSIOCGBUTTONS, &ret_data);
_glfwJoy[joy_count].NumButtons = (int) ret_data;
// Allocate memory for joystick state
_glfwJoy[joy_count].Axis =
(float*) malloc(sizeof(float) *
_glfwJoy[joy_count].NumAxes);
if (_glfwJoy[joy_count].Axis == NULL)
{
close(fd);
continue;
}
_glfwJoy[joy_count].Button =
(unsigned char*) malloc(sizeof(char) *
_glfwJoy[joy_count].NumButtons);
if (_glfwJoy[joy_count].Button == NULL)
{
free(_glfwJoy[joy_count].Axis);
close(fd);
continue;
}
// Clear joystick state
for (n = 0; n < _glfwJoy[joy_count].NumAxes; n++)
_glfwJoy[joy_count].Axis[n] = 0.0f;
for (n = 0; n < _glfwJoy[joy_count].NumButtons; n++)
_glfwJoy[joy_count].Button[n] = GLFW_RELEASE;
// The joystick is supported and connected
_glfwJoy[joy_count].Present = GL_TRUE;
joy_count++;
}
}
}
#endif // _GLFW_USE_LINUX_JOYSTICKS
}
//========================================================================
// Close all opened joystick handles
//========================================================================
void _glfwTerminateJoysticks(void)
{
#ifdef _GLFW_USE_LINUX_JOYSTICKS
int i;
// Close any opened joysticks
for (i = 0; i <= GLFW_JOYSTICK_LAST; i++)
{
if (_glfwJoy[i].Present)
{
close(_glfwJoy[i].fd);
free(_glfwJoy[i].Axis);
free(_glfwJoy[i].Button);
_glfwJoy[i].Present = GL_FALSE;
}
}
#endif // _GLFW_USE_LINUX_JOYSTICKS
}
//========================================================================
// Empty joystick event queue
//========================================================================
static void pollJoystickEvents(void)
{
#ifdef _GLFW_USE_LINUX_JOYSTICKS
struct js_event e;
int i;
// Get joystick events for all GLFW joysticks
for (i = 0; i <= GLFW_JOYSTICK_LAST; i++)
{
// Is the stick present?
if (_glfwJoy[i].Present)
{
// Read all queued events (non-blocking)
while (read(_glfwJoy[i].fd, &e, sizeof(struct js_event)) > 0)
{
// We don't care if it's an init event or not
e.type &= ~JS_EVENT_INIT;
// Check event type
switch (e.type)
{
case JS_EVENT_AXIS:
_glfwJoy[i].Axis[e.number] = (float) e.value / 32767.0f;
// We need to change the sign for the Y axes, so that
// positive = up/forward, according to the GLFW spec.
if (e.number & 1)
_glfwJoy[i].Axis[e.number] = -_glfwJoy[i].Axis[e.number];
break;
case JS_EVENT_BUTTON:
_glfwJoy[i].Button[e.number] =
e.value ? GLFW_PRESS : GLFW_RELEASE;
break;
default:
break;
}
}
}
}
#endif // _GLFW_USE_LINUX_JOYSTICKS
}
//////////////////////////////////////////////////////////////////////////
////// GLFW platform API //////
//////////////////////////////////////////////////////////////////////////
//========================================================================
// Determine joystick capabilities
//========================================================================
int _glfwPlatformGetJoystickParam(int joy, int param)
{
if (!_glfwJoy[joy].Present)
{
// TODO: Figure out if this is an error
return 0;
}
switch (param)
{
case GLFW_PRESENT:
return GL_TRUE;
case GLFW_AXES:
return _glfwJoy[joy].NumAxes;
case GLFW_BUTTONS:
return _glfwJoy[joy].NumButtons;
default:
break;
}
return 0;
}
//========================================================================
// Get joystick axis positions
//========================================================================
int _glfwPlatformGetJoystickPos(int joy, float* pos, int numaxes)
{
int i;
if (!_glfwJoy[joy].Present)
{
// TODO: Figure out if this is an error
return 0;
}
// Update joystick state
pollJoystickEvents();
// Does the joystick support less axes than requested?
if (_glfwJoy[joy].NumAxes < numaxes)
numaxes = _glfwJoy[joy].NumAxes;
// Copy axis positions from internal state
for (i = 0; i < numaxes; i++)
pos[i] = _glfwJoy[joy].Axis[i];
return numaxes;
}
//========================================================================
// Get joystick button states
//========================================================================
int _glfwPlatformGetJoystickButtons(int joy, unsigned char* buttons,
int numbuttons)
{
int i;
if (!_glfwJoy[joy].Present)
{
// TODO: Figure out if this is an error
return 0;
}
// Update joystick state
pollJoystickEvents();
// Does the joystick support less buttons than requested?
if (_glfwJoy[joy].NumButtons < numbuttons)
numbuttons = _glfwJoy[joy].NumButtons;
// Copy button states from internal state
for (i = 0; i < numbuttons; i++)
buttons[i] = _glfwJoy[joy].Button[i];
return numbuttons;
}