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338 lines
10 KiB
338 lines
10 KiB
//======================================================================== |
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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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joy_base_name = "/dev/input/js"; // USB sticks |
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break; |
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case 1: |
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joy_base_name = "/dev/js"; // "Legacy" sticks |
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break; |
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default: |
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continue; // (should never happen) |
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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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