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Cleaned up Linux joystick code.

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This commit is contained in:
Camilla Berglund 2012-08-26 18:11:31 +02:00
parent 2b6080fc20
commit c28fb4ca0c
2 changed files with 159 additions and 224 deletions
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361
src/x11_joystick.c
View File

@ -30,47 +30,128 @@
#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
#include <linux/joystick.h>
//------------------------------------------------------------------------
// 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 <sys/types.h>
#include <sys/stat.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
//========================================================================
// Attempt to open the specified joystick device
//========================================================================
static int openJoystickDevice(int joy, const char* path)
{
#ifdef _GLFW_USE_LINUX_JOYSTICKS
char numAxes, numButtons;
int fd, version;
fd = open(path, O_NONBLOCK);
if (fd == -1)
return GL_FALSE;
_glfwLibrary.X11.joystick[joy].fd = fd;
// Verify that the joystick driver version is at least 1.0
ioctl(fd, JSIOCGVERSION, &version);
if (version < 0x010000)
{
// It's an old 0.x interface (we don't support it)
close(fd);
return GL_FALSE;
}
ioctl(fd, JSIOCGAXES, &numAxes);
_glfwLibrary.X11.joystick[joy].numAxes = (int) numAxes;
ioctl(fd, JSIOCGBUTTONS, &numButtons);
_glfwLibrary.X11.joystick[joy].numButtons = (int) numButtons;
_glfwLibrary.X11.joystick[joy].axis =
(float*) malloc(sizeof(float) * numAxes);
if (_glfwLibrary.X11.joystick[joy].axis == NULL)
{
close(fd);
_glfwSetError(GLFW_OUT_OF_MEMORY, NULL);
return GL_FALSE;
}
_glfwLibrary.X11.joystick[joy].button =
(unsigned char*) malloc(sizeof(char) * numButtons);
if (_glfwLibrary.X11.joystick[joy].button == NULL)
{
free(_glfwLibrary.X11.joystick[joy].axis);
close(fd);
_glfwSetError(GLFW_OUT_OF_MEMORY, NULL);
return GL_FALSE;
}
_glfwLibrary.X11.joystick[joy].present = GL_TRUE;
#endif // _GLFW_USE_LINUX_JOYSTICKS
return GL_TRUE;
}
//========================================================================
// Polls for and processes events for all present joysticks
//========================================================================
static void pollJoystickEvents(void)
{
#ifdef _GLFW_USE_LINUX_JOYSTICKS
int i;
struct js_event e;
for (i = 0; i <= GLFW_JOYSTICK_LAST; i++)
{
if (!_glfwLibrary.X11.joystick[i].present)
continue;
// Read all queued events (non-blocking)
while (read(_glfwLibrary.X11.joystick[i].fd, &e, sizeof(e)) > 0)
{
// We don't care if it's an init event or not
e.type &= ~JS_EVENT_INIT;
switch (e.type)
{
case JS_EVENT_AXIS:
_glfwLibrary.X11.joystick[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)
{
_glfwLibrary.X11.joystick[i].axis[e.number] =
-_glfwLibrary.X11.joystick[i].axis[e.number];
}
break;
case JS_EVENT_BUTTON:
_glfwLibrary.X11.joystick[i].button[e.number] =
e.value ? GLFW_PRESS : GLFW_RELEASE;
break;
default:
break;
}
}
}
#endif // _GLFW_USE_LINUX_JOYSTICKS
}
//////////////////////////////////////////////////////////////////////////
////// GLFW internal API //////
//////////////////////////////////////////////////////////////////////////
@ -82,97 +163,24 @@ struct js_event {
void _glfwInitJoysticks(void)
{
#ifdef _GLFW_USE_LINUX_JOYSTICKS
int k, n, fd, joy_count;
const 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++)
int i, j, joy = 0;
char path[20];
const char* bases[] =
{
// Pick joystick base name
switch (k)
"/dev/input/js",
"/dev/js"
};
for (i = 0; i < sizeof(bases) / sizeof(bases[0]); i++)
{
for (j = 0; j < 50; j++)
{
case 0:
// USB joysticks
joy_base_name = "/dev/input/js";
if (joy > GLFW_JOYSTICK_LAST)
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++;
}
sprintf(path, "%s%i", bases[i], j);
if (openJoystickDevice(joy, path))
joy++;
}
}
#endif // _GLFW_USE_LINUX_JOYSTICKS
@ -185,72 +193,18 @@ void _glfwInitJoysticks(void)
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)
if (_glfwLibrary.X11.joystick[i].present)
{
close(_glfwJoy[i].fd);
free(_glfwJoy[i].Axis);
free(_glfwJoy[i].Button);
close(_glfwLibrary.X11.joystick[i].fd);
free(_glfwLibrary.X11.joystick[i].axis);
free(_glfwLibrary.X11.joystick[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;
}
}
_glfwLibrary.X11.joystick[i].present = GL_FALSE;
}
}
#endif // _GLFW_USE_LINUX_JOYSTICKS
@ -267,11 +221,8 @@ static void pollJoystickEvents(void)
int _glfwPlatformGetJoystickParam(int joy, int param)
{
if (!_glfwJoy[joy].Present)
{
// TODO: Figure out if this is an error
if (!_glfwLibrary.X11.joystick[joy].present)
return 0;
}
switch (param)
{
@ -279,10 +230,10 @@ int _glfwPlatformGetJoystickParam(int joy, int param)
return GL_TRUE;
case GLFW_AXES:
return _glfwJoy[joy].NumAxes;
return _glfwLibrary.X11.joystick[joy].numAxes;
case GLFW_BUTTONS:
return _glfwJoy[joy].NumButtons;
return _glfwLibrary.X11.joystick[joy].numButtons;
default:
break;
@ -296,28 +247,22 @@ int _glfwPlatformGetJoystickParam(int joy, int param)
// Get joystick axis positions
//========================================================================
int _glfwPlatformGetJoystickPos(int joy, float* pos, int numaxes)
int _glfwPlatformGetJoystickPos(int joy, float* pos, int numAxes)
{
int i;
if (!_glfwJoy[joy].Present)
{
// TODO: Figure out if this is an error
if (!_glfwLibrary.X11.joystick[joy].present)
return 0;
}
// Update joystick state
pollJoystickEvents();
// Does the joystick support less axes than requested?
if (_glfwJoy[joy].NumAxes < numaxes)
numaxes = _glfwJoy[joy].NumAxes;
if (_glfwLibrary.X11.joystick[joy].numAxes < numAxes)
numAxes = _glfwLibrary.X11.joystick[joy].numAxes;
// Copy axis positions from internal state
for (i = 0; i < numaxes; i++)
pos[i] = _glfwJoy[joy].Axis[i];
for (i = 0; i < numAxes; i++)
pos[i] = _glfwLibrary.X11.joystick[joy].axis[i];
return numaxes;
return numAxes;
}
@ -326,27 +271,21 @@ int _glfwPlatformGetJoystickPos(int joy, float* pos, int numaxes)
//========================================================================
int _glfwPlatformGetJoystickButtons(int joy, unsigned char* buttons,
int numbuttons)
int numButtons)
{
int i;
if (!_glfwJoy[joy].Present)
{
// TODO: Figure out if this is an error
if (!_glfwLibrary.X11.joystick[joy].present)
return 0;
}
// Update joystick state
pollJoystickEvents();
// Does the joystick support less buttons than requested?
if (_glfwJoy[joy].NumButtons < numbuttons)
numbuttons = _glfwJoy[joy].NumButtons;
if (_glfwLibrary.X11.joystick[joy].numButtons < numButtons)
numButtons = _glfwLibrary.X11.joystick[joy].numButtons;
// Copy button states from internal state
for (i = 0; i < numbuttons; i++)
buttons[i] = _glfwJoy[joy].Button[i];
for (i = 0; i < numButtons; i++)
buttons[i] = _glfwLibrary.X11.joystick[joy].button[i];
return numbuttons;
return numButtons;
}

22
src/x11_platform.h
View File

@ -233,6 +233,15 @@ typedef struct _GLFWlibraryX11
int status;
} selection;
struct {
int present;
int fd;
int numAxes;
int numButtons;
float* axis;
unsigned char* button;
} joystick[GLFW_JOYSTICK_LAST + 1];
} _GLFWlibraryX11;
@ -269,19 +278,6 @@ typedef struct _GLFWlibraryGLX
} _GLFWlibraryGLX;
//------------------------------------------------------------------------
// Joystick information & state
//------------------------------------------------------------------------
GLFWGLOBAL struct {
int Present;
int fd;
int NumAxes;
int NumButtons;
float* Axis;
unsigned char* Button;
} _glfwJoy[GLFW_JOYSTICK_LAST + 1];
//========================================================================
// Prototypes for platform specific internal functions
//========================================================================