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Only poll requested joystick on Linux

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This also performs minor cleanup.
This commit is contained in:
Camilla Berglund 2015-12-10 14:07:42 +01:00
parent ee27930628
commit 8f0f1cf6c1
2 changed files with 72 additions and 77 deletions
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115
src/linux_joystick.c
View File

@ -51,6 +51,7 @@ static void openJoystickDevice(const char* path)
char axisCount, buttonCount;
char name[256];
int joy, fd, version;
_GLFWjoystickLinux* js;
for (joy = GLFW_JOYSTICK_1; joy <= GLFW_JOYSTICK_LAST; joy++)
{
@ -74,8 +75,6 @@ static void openJoystickDevice(const char* path)
if (fd == -1)
return;
_glfw.linux_js.js[joy].fd = fd;
// Verify that the joystick driver version is at least 1.0
ioctl(fd, JSIOCGVERSION, &version);
if (version < 0x010000)
@ -88,29 +87,28 @@ static void openJoystickDevice(const char* path)
if (ioctl(fd, JSIOCGNAME(sizeof(name)), name) < 0)
strncpy(name, "Unknown", sizeof(name));
_glfw.linux_js.js[joy].name = strdup(name);
_glfw.linux_js.js[joy].path = strdup(path);
js = _glfw.linux_js.js + joy;
js->name = strdup(name);
js->path = strdup(path);
js->fd = fd;
ioctl(fd, JSIOCGAXES, &axisCount);
_glfw.linux_js.js[joy].axisCount = (int) axisCount;
js->axisCount = (int) axisCount;
js->axes = calloc(axisCount, sizeof(float));
ioctl(fd, JSIOCGBUTTONS, &buttonCount);
_glfw.linux_js.js[joy].buttonCount = (int) buttonCount;
js->buttonCount = (int) buttonCount;
js->buttons = calloc(buttonCount, 1);
_glfw.linux_js.js[joy].axes = calloc(axisCount, sizeof(float));
_glfw.linux_js.js[joy].buttons = calloc(buttonCount, 1);
_glfw.linux_js.js[joy].present = GLFW_TRUE;
js->present = GLFW_TRUE;
#endif // __linux__
}
// Polls for and processes events for all present joysticks
// Polls for and processes events the specified joystick
//
static void pollJoystickEvents(void)
static GLFWbool pollJoystickEvents(_GLFWjoystickLinux* js)
{
#if defined(__linux__)
int i;
struct js_event e;
ssize_t offset = 0;
char buffer[16384];
@ -131,53 +129,41 @@ static void pollJoystickEvents(void)
offset += sizeof(struct inotify_event) + e->len;
}
for (i = 0; i <= GLFW_JOYSTICK_LAST; i++)
if (!js->present)
return GLFW_FALSE;
// Read all queued events (non-blocking)
for (;;)
{
if (!_glfw.linux_js.js[i].present)
continue;
struct js_event e;
// Read all queued events (non-blocking)
for (;;)
errno = 0;
if (read(js->fd, &e, sizeof(e)) < 0)
{
errno = 0;
if (read(_glfw.linux_js.js[i].fd, &e, sizeof(e)) < 0)
// Reset the joystick slot if the device was disconnected
if (errno == ENODEV)
{
if (errno == ENODEV)
{
// The joystick was disconnected
free(js->axes);
free(js->buttons);
free(js->name);
free(js->path);
free(_glfw.linux_js.js[i].axes);
free(_glfw.linux_js.js[i].buttons);
free(_glfw.linux_js.js[i].name);
free(_glfw.linux_js.js[i].path);
memset(&_glfw.linux_js.js[i], 0, sizeof(_glfw.linux_js.js[i]));
}
break;
memset(js, 0, sizeof(_GLFWjoystickLinux));
}
// We don't care if it's an init event or not
e.type &= ~JS_EVENT_INIT;
switch (e.type)
{
case JS_EVENT_AXIS:
_glfw.linux_js.js[i].axes[e.number] =
(float) e.value / 32767.0f;
break;
case JS_EVENT_BUTTON:
_glfw.linux_js.js[i].buttons[e.number] =
e.value ? GLFW_PRESS : GLFW_RELEASE;
break;
default:
break;
}
break;
}
// Clear the initial-state bit
e.type &= ~JS_EVENT_INIT;
if (e.type == JS_EVENT_AXIS)
js->axes[e.number] = (float) e.value / 32767.0f;
else if (e.type == JS_EVENT_BUTTON)
js->buttons[e.number] = e.value ? GLFW_PRESS : GLFW_RELEASE;
}
#endif // __linux__
return js->present;
}
@ -294,31 +280,36 @@ void _glfwTerminateJoysticks(void)
int _glfwPlatformJoystickPresent(int joy)
{
pollJoystickEvents();
return _glfw.linux_js.js[joy].present;
_GLFWjoystickLinux* js = _glfw.linux_js.js + joy;
return pollJoystickEvents(js);
}
const float* _glfwPlatformGetJoystickAxes(int joy, int* count)
{
pollJoystickEvents();
_GLFWjoystickLinux* js = _glfw.linux_js.js + joy;
if (!pollJoystickEvents(js))
return NULL;
*count = _glfw.linux_js.js[joy].axisCount;
return _glfw.linux_js.js[joy].axes;
*count = js->axisCount;
return js->axes;
}
const unsigned char* _glfwPlatformGetJoystickButtons(int joy, int* count)
{
pollJoystickEvents();
_GLFWjoystickLinux* js = _glfw.linux_js.js + joy;
if (!pollJoystickEvents(js))
return NULL;
*count = _glfw.linux_js.js[joy].buttonCount;
return _glfw.linux_js.js[joy].buttons;
*count = js->buttonCount;
return js->buttons;
}
const char* _glfwPlatformGetJoystickName(int joy)
{
pollJoystickEvents();
_GLFWjoystickLinux* js = _glfw.linux_js.js + joy;
if (!pollJoystickEvents(js))
return NULL;
return _glfw.linux_js.js[joy].name;
return js->name;
}

34
src/linux_joystick.h
View File

@ -29,32 +29,36 @@
#include <regex.h>
#define _GLFW_PLATFORM_LIBRARY_JOYSTICK_STATE \
_GLFWjoystickLinux linux_js
#define _GLFW_PLATFORM_LIBRARY_JOYSTICK_STATE _GLFWjoylistLinux linux_js
// Linux-specific joystick data
//
typedef struct _GLFWjoystickLinux
{
int present;
int fd;
float* axes;
int axisCount;
unsigned char* buttons;
int buttonCount;
char* name;
char* path;
} _GLFWjoystickLinux;
// Linux-specific joystick API data
//
typedef struct _GLFWjoystickLinux
typedef struct _GLFWjoylistLinux
{
struct
{
int present;
int fd;
float* axes;
int axisCount;
unsigned char* buttons;
int buttonCount;
char* name;
char* path;
} js[GLFW_JOYSTICK_LAST + 1];
_GLFWjoystickLinux js[GLFW_JOYSTICK_LAST + 1];
#if defined(__linux__)
int inotify;
int watch;
regex_t regex;
#endif /*__linux__*/
} _GLFWjoystickLinux;
} _GLFWjoylistLinux;
int _glfwInitJoysticks(void);