mirror of https://github.com/glfw/glfw.git
Cleaned up Linux joystick code.
This commit is contained in:
Camilla Berglund
parent
2b6080fc20
commit
c28fb4ca0c
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@ -30,47 +30,128 @@
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#include "internal.h"
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//========================================================================
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// Note: Only Linux joystick input is supported at the moment. Other
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// systems will behave as if there are no joysticks connected.
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//========================================================================
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#ifdef _GLFW_USE_LINUX_JOYSTICKS
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#include <linux/joystick.h>
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//------------------------------------------------------------------------
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// Here are the Linux joystick driver v1.x interface definitions that we
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// use (we do not want to rely on <linux/joystick.h>):
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//------------------------------------------------------------------------
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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// Joystick event types
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#define JS_EVENT_BUTTON 0x01 /* button pressed/released */
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#define JS_EVENT_AXIS 0x02 /* joystick moved */
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#define JS_EVENT_INIT 0x80 /* initial state of device */
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// Joystick event structure
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struct js_event {
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unsigned int time; /* (u32) event timestamp in milliseconds */
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signed short value; /* (s16) value */
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unsigned char type; /* (u8) event type */
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unsigned char number; /* (u8) axis/button number */
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};
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// Joystick IOCTL commands
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#define JSIOCGVERSION _IOR('j', 0x01, int) /* get driver version (u32) */
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#define JSIOCGAXES _IOR('j', 0x11, char) /* get number of axes (u8) */
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#define JSIOCGBUTTONS _IOR('j', 0x12, char) /* get number of buttons (u8) */
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#endif // _GLFW_USE_LINUX_JOYSTICKS
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//========================================================================
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// Attempt to open the specified joystick device
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//========================================================================
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static int openJoystickDevice(int joy, const char* path)
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{
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#ifdef _GLFW_USE_LINUX_JOYSTICKS
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char numAxes, numButtons;
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int fd, version;
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fd = open(path, O_NONBLOCK);
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if (fd == -1)
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return GL_FALSE;
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_glfwLibrary.X11.joystick[joy].fd = fd;
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// Verify that the joystick driver version is at least 1.0
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ioctl(fd, JSIOCGVERSION, &version);
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if (version < 0x010000)
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{
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// It's an old 0.x interface (we don't support it)
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close(fd);
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return GL_FALSE;
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}
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ioctl(fd, JSIOCGAXES, &numAxes);
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_glfwLibrary.X11.joystick[joy].numAxes = (int) numAxes;
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ioctl(fd, JSIOCGBUTTONS, &numButtons);
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_glfwLibrary.X11.joystick[joy].numButtons = (int) numButtons;
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_glfwLibrary.X11.joystick[joy].axis =
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(float*) malloc(sizeof(float) * numAxes);
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if (_glfwLibrary.X11.joystick[joy].axis == NULL)
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{
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close(fd);
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_glfwSetError(GLFW_OUT_OF_MEMORY, NULL);
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return GL_FALSE;
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}
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_glfwLibrary.X11.joystick[joy].button =
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(unsigned char*) malloc(sizeof(char) * numButtons);
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if (_glfwLibrary.X11.joystick[joy].button == NULL)
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{
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free(_glfwLibrary.X11.joystick[joy].axis);
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close(fd);
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_glfwSetError(GLFW_OUT_OF_MEMORY, NULL);
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return GL_FALSE;
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}
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_glfwLibrary.X11.joystick[joy].present = GL_TRUE;
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#endif // _GLFW_USE_LINUX_JOYSTICKS
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return GL_TRUE;
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}
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//========================================================================
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// Polls for and processes events for all present joysticks
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//========================================================================
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static void pollJoystickEvents(void)
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{
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#ifdef _GLFW_USE_LINUX_JOYSTICKS
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int i;
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struct js_event e;
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for (i = 0; i <= GLFW_JOYSTICK_LAST; i++)
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{
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if (!_glfwLibrary.X11.joystick[i].present)
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continue;
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// Read all queued events (non-blocking)
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while (read(_glfwLibrary.X11.joystick[i].fd, &e, sizeof(e)) > 0)
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{
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// We don't care if it's an init event or not
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e.type &= ~JS_EVENT_INIT;
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switch (e.type)
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{
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case JS_EVENT_AXIS:
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_glfwLibrary.X11.joystick[i].axis[e.number] =
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(float) e.value / 32767.0f;
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// We need to change the sign for the Y axes, so that
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// positive = up/forward, according to the GLFW spec.
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if (e.number & 1)
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{
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_glfwLibrary.X11.joystick[i].axis[e.number] =
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-_glfwLibrary.X11.joystick[i].axis[e.number];
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}
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break;
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case JS_EVENT_BUTTON:
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_glfwLibrary.X11.joystick[i].button[e.number] =
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e.value ? GLFW_PRESS : GLFW_RELEASE;
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break;
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default:
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break;
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}
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}
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}
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#endif // _GLFW_USE_LINUX_JOYSTICKS
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}
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//////////////////////////////////////////////////////////////////////////
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////// GLFW internal API //////
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//////////////////////////////////////////////////////////////////////////
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@ -82,97 +163,24 @@ struct js_event {
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void _glfwInitJoysticks(void)
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{
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#ifdef _GLFW_USE_LINUX_JOYSTICKS
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int k, n, fd, joy_count;
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const char* joy_base_name;
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char joy_dev_name[20];
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int driver_version = 0x000800;
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char ret_data;
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#endif // _GLFW_USE_LINUX_JOYSTICKS
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int i;
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// Start by saying that there are no sticks
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for (i = 0; i <= GLFW_JOYSTICK_LAST; i++)
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_glfwJoy[i].Present = GL_FALSE;
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#ifdef _GLFW_USE_LINUX_JOYSTICKS
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// Try to open joysticks (nonblocking)
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joy_count = 0;
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for (k = 0; k <= 1 && joy_count <= GLFW_JOYSTICK_LAST; k++)
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int i, j, joy = 0;
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char path[20];
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const char* bases[] =
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{
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// Pick joystick base name
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switch (k)
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"/dev/input/js",
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"/dev/js"
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};
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for (i = 0; i < sizeof(bases) / sizeof(bases[0]); i++)
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{
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for (j = 0; j < 50; j++)
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{
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case 0:
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// USB joysticks
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joy_base_name = "/dev/input/js";
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if (joy > GLFW_JOYSTICK_LAST)
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break;
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case 1:
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// "Legacy" joysticks
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joy_base_name = "/dev/js";
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break;
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default:
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// This should never happen
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continue;
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}
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// Try to open a few of these sticks
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for (i = 0; i <= 50 && joy_count <= GLFW_JOYSTICK_LAST; i++)
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{
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sprintf(joy_dev_name, "%s%d", joy_base_name, i);
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fd = open(joy_dev_name, O_NONBLOCK);
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if (fd != -1)
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{
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// Remember fd
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_glfwJoy[joy_count].fd = fd;
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// Check that the joystick driver version is 1.0+
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ioctl(fd, JSIOCGVERSION, &driver_version);
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if (driver_version < 0x010000)
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{
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// It's an old 0.x interface (we don't support it)
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close(fd);
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continue;
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}
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// Get number of joystick axes
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ioctl(fd, JSIOCGAXES, &ret_data);
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_glfwJoy[joy_count].NumAxes = (int) ret_data;
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// Get number of joystick buttons
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ioctl(fd, JSIOCGBUTTONS, &ret_data);
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_glfwJoy[joy_count].NumButtons = (int) ret_data;
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// Allocate memory for joystick state
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_glfwJoy[joy_count].Axis =
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(float*) malloc(sizeof(float) *
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_glfwJoy[joy_count].NumAxes);
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if (_glfwJoy[joy_count].Axis == NULL)
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{
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close(fd);
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continue;
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}
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_glfwJoy[joy_count].Button =
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(unsigned char*) malloc(sizeof(char) *
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_glfwJoy[joy_count].NumButtons);
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if (_glfwJoy[joy_count].Button == NULL)
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{
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free(_glfwJoy[joy_count].Axis);
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close(fd);
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continue;
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}
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// Clear joystick state
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for (n = 0; n < _glfwJoy[joy_count].NumAxes; n++)
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_glfwJoy[joy_count].Axis[n] = 0.0f;
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for (n = 0; n < _glfwJoy[joy_count].NumButtons; n++)
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_glfwJoy[joy_count].Button[n] = GLFW_RELEASE;
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// The joystick is supported and connected
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_glfwJoy[joy_count].Present = GL_TRUE;
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joy_count++;
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}
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sprintf(path, "%s%i", bases[i], j);
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if (openJoystickDevice(joy, path))
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joy++;
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}
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}
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#endif // _GLFW_USE_LINUX_JOYSTICKS
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@ -185,72 +193,18 @@ void _glfwInitJoysticks(void)
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void _glfwTerminateJoysticks(void)
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{
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#ifdef _GLFW_USE_LINUX_JOYSTICKS
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int i;
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// Close any opened joysticks
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for (i = 0; i <= GLFW_JOYSTICK_LAST; i++)
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{
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if (_glfwJoy[i].Present)
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if (_glfwLibrary.X11.joystick[i].present)
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{
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close(_glfwJoy[i].fd);
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free(_glfwJoy[i].Axis);
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free(_glfwJoy[i].Button);
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close(_glfwLibrary.X11.joystick[i].fd);
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free(_glfwLibrary.X11.joystick[i].axis);
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free(_glfwLibrary.X11.joystick[i].button);
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_glfwJoy[i].Present = GL_FALSE;
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}
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}
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#endif // _GLFW_USE_LINUX_JOYSTICKS
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}
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//========================================================================
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// Empty joystick event queue
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//========================================================================
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static void pollJoystickEvents(void)
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{
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#ifdef _GLFW_USE_LINUX_JOYSTICKS
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struct js_event e;
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int i;
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// Get joystick events for all GLFW joysticks
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for (i = 0; i <= GLFW_JOYSTICK_LAST; i++)
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{
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// Is the stick present?
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if (_glfwJoy[i].Present)
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{
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// Read all queued events (non-blocking)
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while (read(_glfwJoy[i].fd, &e, sizeof(struct js_event)) > 0)
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{
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// We don't care if it's an init event or not
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e.type &= ~JS_EVENT_INIT;
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// Check event type
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switch (e.type)
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{
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case JS_EVENT_AXIS:
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_glfwJoy[i].Axis[e.number] = (float) e.value / 32767.0f;
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// We need to change the sign for the Y axes, so that
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// positive = up/forward, according to the GLFW spec.
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if (e.number & 1)
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_glfwJoy[i].Axis[e.number] = -_glfwJoy[i].Axis[e.number];
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break;
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case JS_EVENT_BUTTON:
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_glfwJoy[i].Button[e.number] =
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e.value ? GLFW_PRESS : GLFW_RELEASE;
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break;
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default:
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break;
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}
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}
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_glfwLibrary.X11.joystick[i].present = GL_FALSE;
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}
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}
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#endif // _GLFW_USE_LINUX_JOYSTICKS
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@ -267,11 +221,8 @@ static void pollJoystickEvents(void)
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int _glfwPlatformGetJoystickParam(int joy, int param)
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{
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if (!_glfwJoy[joy].Present)
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{
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// TODO: Figure out if this is an error
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if (!_glfwLibrary.X11.joystick[joy].present)
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return 0;
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}
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switch (param)
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{
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@ -279,10 +230,10 @@ int _glfwPlatformGetJoystickParam(int joy, int param)
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return GL_TRUE;
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case GLFW_AXES:
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return _glfwJoy[joy].NumAxes;
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return _glfwLibrary.X11.joystick[joy].numAxes;
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case GLFW_BUTTONS:
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return _glfwJoy[joy].NumButtons;
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return _glfwLibrary.X11.joystick[joy].numButtons;
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default:
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break;
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@ -296,28 +247,22 @@ int _glfwPlatformGetJoystickParam(int joy, int param)
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// Get joystick axis positions
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//========================================================================
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int _glfwPlatformGetJoystickPos(int joy, float* pos, int numaxes)
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int _glfwPlatformGetJoystickPos(int joy, float* pos, int numAxes)
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{
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int i;
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if (!_glfwJoy[joy].Present)
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{
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// TODO: Figure out if this is an error
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if (!_glfwLibrary.X11.joystick[joy].present)
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return 0;
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}
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// Update joystick state
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pollJoystickEvents();
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// Does the joystick support less axes than requested?
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if (_glfwJoy[joy].NumAxes < numaxes)
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numaxes = _glfwJoy[joy].NumAxes;
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if (_glfwLibrary.X11.joystick[joy].numAxes < numAxes)
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numAxes = _glfwLibrary.X11.joystick[joy].numAxes;
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// Copy axis positions from internal state
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for (i = 0; i < numaxes; i++)
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pos[i] = _glfwJoy[joy].Axis[i];
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for (i = 0; i < numAxes; i++)
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pos[i] = _glfwLibrary.X11.joystick[joy].axis[i];
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return numaxes;
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return numAxes;
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}
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@ -326,27 +271,21 @@ int _glfwPlatformGetJoystickPos(int joy, float* pos, int numaxes)
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//========================================================================
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int _glfwPlatformGetJoystickButtons(int joy, unsigned char* buttons,
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int numbuttons)
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int numButtons)
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{
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int i;
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if (!_glfwJoy[joy].Present)
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{
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// TODO: Figure out if this is an error
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if (!_glfwLibrary.X11.joystick[joy].present)
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return 0;
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}
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// Update joystick state
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pollJoystickEvents();
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// Does the joystick support less buttons than requested?
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if (_glfwJoy[joy].NumButtons < numbuttons)
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numbuttons = _glfwJoy[joy].NumButtons;
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if (_glfwLibrary.X11.joystick[joy].numButtons < numButtons)
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numButtons = _glfwLibrary.X11.joystick[joy].numButtons;
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// Copy button states from internal state
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for (i = 0; i < numbuttons; i++)
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buttons[i] = _glfwJoy[joy].Button[i];
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for (i = 0; i < numButtons; i++)
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buttons[i] = _glfwLibrary.X11.joystick[joy].button[i];
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return numbuttons;
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return numButtons;
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}
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@ -233,6 +233,15 @@ typedef struct _GLFWlibraryX11
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int status;
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} selection;
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struct {
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int present;
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int fd;
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int numAxes;
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int numButtons;
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float* axis;
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unsigned char* button;
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} joystick[GLFW_JOYSTICK_LAST + 1];
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} _GLFWlibraryX11;
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@ -269,19 +278,6 @@ typedef struct _GLFWlibraryGLX
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} _GLFWlibraryGLX;
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//------------------------------------------------------------------------
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// Joystick information & state
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//------------------------------------------------------------------------
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GLFWGLOBAL struct {
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int Present;
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int fd;
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int NumAxes;
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int NumButtons;
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float* Axis;
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unsigned char* Button;
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} _glfwJoy[GLFW_JOYSTICK_LAST + 1];
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//========================================================================
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// Prototypes for platform specific internal functions
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//========================================================================
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