//======================================================================== // GLFW - An OpenGL library // Platform: X11 // API version: 3.0 // WWW: http://www.glfw.org/ //------------------------------------------------------------------------ // Copyright (c) 2002-2006 Marcus Geelnard // Copyright (c) 2006-2010 Camilla Berglund // // This software is provided 'as-is', without any express or implied // warranty. In no event will the authors be held liable for any damages // arising from the use of this software. // // Permission is granted to anyone to use this software for any purpose, // including commercial applications, and to alter it and redistribute it // freely, subject to the following restrictions: // // 1. The origin of this software must not be misrepresented; you must not // claim that you wrote the original software. If you use this software // in a product, an acknowledgment in the product documentation would // be appreciated but is not required. // // 2. Altered source versions must be plainly marked as such, and must not // be misrepresented as being the original software. // // 3. This notice may not be removed or altered from any source // distribution. // //======================================================================== #include "internal.h" #ifdef _GLFW_USE_LINUX_JOYSTICKS #include #include #include #include #include #include #include #endif // _GLFW_USE_LINUX_JOYSTICKS //======================================================================== // Attempt to open the specified joystick device //======================================================================== static int openJoystickDevice(int joy, const char* path) { #ifdef _GLFW_USE_LINUX_JOYSTICKS char numAxes, numButtons; int fd, version; fd = open(path, O_RDONLY | O_NONBLOCK); if (fd == -1) return GL_FALSE; _glfwLibrary.X11.joystick[joy].fd = fd; // Verify that the joystick driver version is at least 1.0 ioctl(fd, JSIOCGVERSION, &version); if (version < 0x010000) { // It's an old 0.x interface (we don't support it) close(fd); return GL_FALSE; } ioctl(fd, JSIOCGAXES, &numAxes); _glfwLibrary.X11.joystick[joy].numAxes = (int) numAxes; ioctl(fd, JSIOCGBUTTONS, &numButtons); _glfwLibrary.X11.joystick[joy].numButtons = (int) numButtons; _glfwLibrary.X11.joystick[joy].axis = (float*) malloc(sizeof(float) * numAxes); if (_glfwLibrary.X11.joystick[joy].axis == NULL) { close(fd); _glfwSetError(GLFW_OUT_OF_MEMORY, NULL); return GL_FALSE; } _glfwLibrary.X11.joystick[joy].button = (unsigned char*) malloc(sizeof(char) * numButtons); if (_glfwLibrary.X11.joystick[joy].button == NULL) { free(_glfwLibrary.X11.joystick[joy].axis); close(fd); _glfwSetError(GLFW_OUT_OF_MEMORY, NULL); return GL_FALSE; } _glfwLibrary.X11.joystick[joy].present = GL_TRUE; #endif // _GLFW_USE_LINUX_JOYSTICKS return GL_TRUE; } //======================================================================== // Polls for and processes events for all present joysticks //======================================================================== static void pollJoystickEvents(void) { #ifdef _GLFW_USE_LINUX_JOYSTICKS int i; ssize_t result; struct js_event e; for (i = 0; i <= GLFW_JOYSTICK_LAST; i++) { if (!_glfwLibrary.X11.joystick[i].present) continue; // Read all queued events (non-blocking) for (;;) { errno = 0; result = read(_glfwLibrary.X11.joystick[i].fd, &e, sizeof(e)); if (errno == ENODEV) _glfwLibrary.X11.joystick[i].present = GL_FALSE; if (result == -1) break; // We don't care if it's an init event or not e.type &= ~JS_EVENT_INIT; switch (e.type) { case JS_EVENT_AXIS: _glfwLibrary.X11.joystick[i].axis[e.number] = (float) e.value / 32767.0f; // We need to change the sign for the Y axes, so that // positive = up/forward, according to the GLFW spec. if (e.number & 1) { _glfwLibrary.X11.joystick[i].axis[e.number] = -_glfwLibrary.X11.joystick[i].axis[e.number]; } break; case JS_EVENT_BUTTON: _glfwLibrary.X11.joystick[i].button[e.number] = e.value ? GLFW_PRESS : GLFW_RELEASE; break; default: break; } } } #endif // _GLFW_USE_LINUX_JOYSTICKS } ////////////////////////////////////////////////////////////////////////// ////// GLFW internal API ////// ////////////////////////////////////////////////////////////////////////// //======================================================================== // Initialize joystick interface //======================================================================== void _glfwInitJoysticks(void) { #ifdef _GLFW_USE_LINUX_JOYSTICKS int i, j, joy = 0; char path[20]; const char* bases[] = { "/dev/input/js", "/dev/js" }; for (i = 0; i < sizeof(bases) / sizeof(bases[0]); i++) { for (j = 0; j < 50; j++) { if (joy > GLFW_JOYSTICK_LAST) break; sprintf(path, "%s%i", bases[i], j); if (openJoystickDevice(joy, path)) joy++; } } #endif // _GLFW_USE_LINUX_JOYSTICKS } //======================================================================== // Close all opened joystick handles //======================================================================== void _glfwTerminateJoysticks(void) { #ifdef _GLFW_USE_LINUX_JOYSTICKS int i; for (i = 0; i <= GLFW_JOYSTICK_LAST; i++) { if (_glfwLibrary.X11.joystick[i].present) { close(_glfwLibrary.X11.joystick[i].fd); free(_glfwLibrary.X11.joystick[i].axis); free(_glfwLibrary.X11.joystick[i].button); _glfwLibrary.X11.joystick[i].present = GL_FALSE; } } #endif // _GLFW_USE_LINUX_JOYSTICKS } ////////////////////////////////////////////////////////////////////////// ////// GLFW platform API ////// ////////////////////////////////////////////////////////////////////////// //======================================================================== // Determine joystick capabilities //======================================================================== int _glfwPlatformGetJoystickParam(int joy, int param) { pollJoystickEvents(); if (!_glfwLibrary.X11.joystick[joy].present) return 0; switch (param) { case GLFW_PRESENT: return GL_TRUE; case GLFW_AXES: return _glfwLibrary.X11.joystick[joy].numAxes; case GLFW_BUTTONS: return _glfwLibrary.X11.joystick[joy].numButtons; default: _glfwSetError(GLFW_INVALID_ENUM, NULL); } return 0; } //======================================================================== // Get joystick axis positions //======================================================================== int _glfwPlatformGetJoystickAxes(int joy, float* axes, int numAxes) { int i; pollJoystickEvents(); if (!_glfwLibrary.X11.joystick[joy].present) return 0; if (_glfwLibrary.X11.joystick[joy].numAxes < numAxes) numAxes = _glfwLibrary.X11.joystick[joy].numAxes; for (i = 0; i < numAxes; i++) axes[i] = _glfwLibrary.X11.joystick[joy].axis[i]; return numAxes; } //======================================================================== // Get joystick button states //======================================================================== int _glfwPlatformGetJoystickButtons(int joy, unsigned char* buttons, int numButtons) { int i; pollJoystickEvents(); if (!_glfwLibrary.X11.joystick[joy].present) return 0; if (_glfwLibrary.X11.joystick[joy].numButtons < numButtons) numButtons = _glfwLibrary.X11.joystick[joy].numButtons; for (i = 0; i < numButtons; i++) buttons[i] = _glfwLibrary.X11.joystick[joy].button[i]; return numButtons; }