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367 lines
11 KiB
367 lines
11 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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// _glfwInitJoysticks() - 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, 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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{ |
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_glfwJoy[ i ].Present = GL_FALSE; |
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} |
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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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{ |
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_glfwJoy[ joy_count ].Axis[ n ] = 0.0f; |
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} |
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for( n = 0; n < _glfwJoy[ joy_count ].NumButtons; ++ n ) |
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{ |
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_glfwJoy[ joy_count ].Button[ n ] = GLFW_RELEASE; |
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} |
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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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// _glfwTerminateJoysticks() - 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 / |
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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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_glfwJoy[ i ].Axis[ e.number ] = |
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-_glfwJoy[ 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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_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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// _glfwPlatformGetJoystickParam() - 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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// Is joystick present? |
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if( !_glfwJoy[ joy ].Present ) |
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{ |
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return 0; |
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} |
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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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// _glfwPlatformGetJoystickPos() - 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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// Is joystick present? |
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if( !_glfwJoy[ joy ].Present ) |
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{ |
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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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{ |
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numaxes = _glfwJoy[ joy ].NumAxes; |
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} |
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// Copy axis positions from internal state |
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for( i = 0; i < numaxes; ++ i ) |
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{ |
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pos[ i ] = _glfwJoy[ joy ].Axis[ i ]; |
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} |
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return numaxes; |
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} |
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//======================================================================== |
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// _glfwPlatformGetJoystickButtons() - 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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// Is joystick present? |
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if( !_glfwJoy[ joy ].Present ) |
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{ |
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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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{ |
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numbuttons = _glfwJoy[ joy ].NumButtons; |
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} |
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// Copy button states from internal state |
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for( i = 0; i < numbuttons; ++ i ) |
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{ |
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buttons[ i ] = _glfwJoy[ joy ].Button[ i ]; |
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} |
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return numbuttons; |
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} |
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