mirror of
https://github.com/gwm17/glfw.git
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305 lines
8.6 KiB
C
305 lines
8.6 KiB
C
//========================================================================
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// GLFW - An OpenGL library
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// Platform: X11
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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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#ifdef _GLFW_USE_LINUX_JOYSTICKS
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#include <linux/joystick.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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#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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ssize_t result;
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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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for (;;)
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{
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errno = 0;
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result = read(_glfwLibrary.X11.joystick[i].fd, &e, sizeof(e));
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if (errno == ENODEV)
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_glfwLibrary.X11.joystick[i].present = GL_FALSE;
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if (result < sizeof(e))
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break;
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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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//========================================================================
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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 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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"/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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if (joy > GLFW_JOYSTICK_LAST)
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break;
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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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}
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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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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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{
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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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_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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}
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//////////////////////////////////////////////////////////////////////////
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////// GLFW platform API //////
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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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pollJoystickEvents();
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if (!_glfwLibrary.X11.joystick[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 _glfwLibrary.X11.joystick[joy].numAxes;
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case GLFW_BUTTONS:
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return _glfwLibrary.X11.joystick[joy].numButtons;
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default:
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_glfwSetError(GLFW_INVALID_ENUM, NULL);
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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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pollJoystickEvents();
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if (!_glfwLibrary.X11.joystick[joy].present)
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return 0;
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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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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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}
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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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pollJoystickEvents();
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if (!_glfwLibrary.X11.joystick[joy].present)
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return 0;
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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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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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}
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