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https://github.com/glfw/glfw.git
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342 lines
11 KiB
C
342 lines
11 KiB
C
//========================================================================
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// GLFW - An OpenGL framework
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// Platform: X11/GLX
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// API version: 3.0
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// WWW: http://www.glfw.org/
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//------------------------------------------------------------------------
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// Copyright (c) 2002-2006 Marcus Geelnard
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// Copyright (c) 2006-2010 Camilla Berglund <elmindreda@elmindreda.org>
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//
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// This software is provided 'as-is', without any express or implied
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// warranty. In no event will the authors be held liable for any damages
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// arising from the use of this software.
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//
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// Permission is granted to anyone to use this software for any purpose,
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// including commercial applications, and to alter it and redistribute it
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// freely, subject to the following restrictions:
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//
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// 1. The origin of this software must not be misrepresented; you must not
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// claim that you wrote the original software. If you use this software
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// in a product, an acknowledgment in the product documentation would
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// be appreciated but is not required.
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//
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// 2. Altered source versions must be plainly marked as such, and must not
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// be misrepresented as being the original software.
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//
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// 3. This notice may not be removed or altered from any source
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// distribution.
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//
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//========================================================================
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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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//************************************************************************
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//**** GLFW internal functions ****
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//************************************************************************
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#ifdef _GLFW_USE_LINUX_JOYSTICKS
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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 <fcntl.h>
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#include <errno.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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// Initialize joystick interface
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//========================================================================
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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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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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{
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// Pick joystick base name
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switch (k)
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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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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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}
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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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// Close all opened joystick handles
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//========================================================================
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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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{
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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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_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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}
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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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//**** Platform implementation functions ****
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//************************************************************************
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//========================================================================
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// Determine joystick capabilities
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//========================================================================
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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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return 0;
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switch (param)
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{
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case GLFW_PRESENT:
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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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case GLFW_BUTTONS:
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return _glfwJoy[joy].NumButtons;
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default:
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break;
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}
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return 0;
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}
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//========================================================================
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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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{
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int i;
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if (!_glfwJoy[joy].Present)
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return 0;
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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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// 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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return numaxes;
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}
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//========================================================================
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// Get joystick button states
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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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{
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int i;
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if (!_glfwJoy[joy].Present)
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return 0;
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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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// 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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return numbuttons;
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}
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