add glfw library

1 files changed, 433 insertions, 0 deletions

diff --git a/libs/glfw-3.3.8/src/linux_joystick.c b/libs/glfw-3.3.8/src/linux_joystick.c
new file mode 100644
index 0000000..0894a72
--- /dev/null
+++ b/libs/glfw-3.3.8/src/linux_joystick.c
@@ -0,0 +1,433 @@
+//========================================================================
+// GLFW 3.3 Linux - www.glfw.org
+//------------------------------------------------------------------------
+// Copyright (c) 2002-2006 Marcus Geelnard
+// Copyright (c) 2006-2017 Camilla Löwy <elmindreda@glfw.org>
+//
+// 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.
+//
+//========================================================================
+// It is fine to use C99 in this file because it will not be built with VS
+//========================================================================
+
+#include "internal.h"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/inotify.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <dirent.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#ifndef SYN_DROPPED // < v2.6.39 kernel headers
+// Workaround for CentOS-6, which is supported till 2020-11-30, but still on v2.6.32
+#define SYN_DROPPED 3
+#endif
+
+// Apply an EV_KEY event to the specified joystick
+//
+static void handleKeyEvent(_GLFWjoystick* js, int code, int value)
+{
+    _glfwInputJoystickButton(js,
+                             js->linjs.keyMap[code - BTN_MISC],
+                             value ? GLFW_PRESS : GLFW_RELEASE);
+}
+
+// Apply an EV_ABS event to the specified joystick
+//
+static void handleAbsEvent(_GLFWjoystick* js, int code, int value)
+{
+    const int index = js->linjs.absMap[code];
+
+    if (code >= ABS_HAT0X && code <= ABS_HAT3Y)
+    {
+        static const char stateMap[3][3] =
+        {
+            { GLFW_HAT_CENTERED, GLFW_HAT_UP,       GLFW_HAT_DOWN },
+            { GLFW_HAT_LEFT,     GLFW_HAT_LEFT_UP,  GLFW_HAT_LEFT_DOWN },
+            { GLFW_HAT_RIGHT,    GLFW_HAT_RIGHT_UP, GLFW_HAT_RIGHT_DOWN },
+        };
+
+        const int hat = (code - ABS_HAT0X) / 2;
+        const int axis = (code - ABS_HAT0X) % 2;
+        int* state = js->linjs.hats[hat];
+
+        // NOTE: Looking at several input drivers, it seems all hat events use
+        //       -1 for left / up, 0 for centered and 1 for right / down
+        if (value == 0)
+            state[axis] = 0;
+        else if (value < 0)
+            state[axis] = 1;
+        else if (value > 0)
+            state[axis] = 2;
+
+        _glfwInputJoystickHat(js, index, stateMap[state[0]][state[1]]);
+    }
+    else
+    {
+        const struct input_absinfo* info = &js->linjs.absInfo[code];
+        float normalized = value;
+
+        const int range = info->maximum - info->minimum;
+        if (range)
+        {
+            // Normalize to 0.0 -> 1.0
+            normalized = (normalized - info->minimum) / range;
+            // Normalize to -1.0 -> 1.0
+            normalized = normalized * 2.0f - 1.0f;
+        }
+
+        _glfwInputJoystickAxis(js, index, normalized);
+    }
+}
+
+// Poll state of absolute axes
+//
+static void pollAbsState(_GLFWjoystick* js)
+{
+    for (int code = 0;  code < ABS_CNT;  code++)
+    {
+        if (js->linjs.absMap[code] < 0)
+            continue;
+
+        struct input_absinfo* info = &js->linjs.absInfo[code];
+
+        if (ioctl(js->linjs.fd, EVIOCGABS(code), info) < 0)
+            continue;
+
+        handleAbsEvent(js, code, info->value);
+    }
+}
+
+#define isBitSet(bit, arr) (arr[(bit) / 8] & (1 << ((bit) % 8)))
+
+// Attempt to open the specified joystick device
+//
+static GLFWbool openJoystickDevice(const char* path)
+{
+    for (int jid = 0;  jid <= GLFW_JOYSTICK_LAST;  jid++)
+    {
+        if (!_glfw.joysticks[jid].connected)
+            continue;
+        if (strcmp(_glfw.joysticks[jid].linjs.path, path) == 0)
+            return GLFW_FALSE;
+    }
+
+    _GLFWjoystickLinux linjs = {0};
+    linjs.fd = open(path, O_RDONLY | O_NONBLOCK);
+    if (linjs.fd == -1)
+        return GLFW_FALSE;
+
+    char evBits[(EV_CNT + 7) / 8] = {0};
+    char keyBits[(KEY_CNT + 7) / 8] = {0};
+    char absBits[(ABS_CNT + 7) / 8] = {0};
+    struct input_id id;
+
+    if (ioctl(linjs.fd, EVIOCGBIT(0, sizeof(evBits)), evBits) < 0 ||
+        ioctl(linjs.fd, EVIOCGBIT(EV_KEY, sizeof(keyBits)), keyBits) < 0 ||
+        ioctl(linjs.fd, EVIOCGBIT(EV_ABS, sizeof(absBits)), absBits) < 0 ||
+        ioctl(linjs.fd, EVIOCGID, &id) < 0)
+    {
+        _glfwInputError(GLFW_PLATFORM_ERROR,
+                        "Linux: Failed to query input device: %s",
+                        strerror(errno));
+        close(linjs.fd);
+        return GLFW_FALSE;
+    }
+
+    // Ensure this device supports the events expected of a joystick
+    if (!isBitSet(EV_KEY, evBits) || !isBitSet(EV_ABS, evBits))
+    {
+        close(linjs.fd);
+        return GLFW_FALSE;
+    }
+
+    char name[256] = "";
+
+    if (ioctl(linjs.fd, EVIOCGNAME(sizeof(name)), name) < 0)
+        strncpy(name, "Unknown", sizeof(name));
+
+    char guid[33] = "";
+
+    // Generate a joystick GUID that matches the SDL 2.0.5+ one
+    if (id.vendor && id.product && id.version)
+    {
+        sprintf(guid, "%02x%02x0000%02x%02x0000%02x%02x0000%02x%02x0000",
+                id.bustype & 0xff, id.bustype >> 8,
+                id.vendor & 0xff,  id.vendor >> 8,
+                id.product & 0xff, id.product >> 8,
+                id.version & 0xff, id.version >> 8);
+    }
+    else
+    {
+        sprintf(guid, "%02x%02x0000%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x00",
+                id.bustype & 0xff, id.bustype >> 8,
+                name[0], name[1], name[2], name[3],
+                name[4], name[5], name[6], name[7],
+                name[8], name[9], name[10]);
+    }
+
+    int axisCount = 0, buttonCount = 0, hatCount = 0;
+
+    for (int code = BTN_MISC;  code < KEY_CNT;  code++)
+    {
+        if (!isBitSet(code, keyBits))
+            continue;
+
+        linjs.keyMap[code - BTN_MISC] = buttonCount;
+        buttonCount++;
+    }
+
+    for (int code = 0;  code < ABS_CNT;  code++)
+    {
+        linjs.absMap[code] = -1;
+        if (!isBitSet(code, absBits))
+            continue;
+
+        if (code >= ABS_HAT0X && code <= ABS_HAT3Y)
+        {
+            linjs.absMap[code] = hatCount;
+            hatCount++;
+            // Skip the Y axis
+            code++;
+        }
+        else
+        {
+            if (ioctl(linjs.fd, EVIOCGABS(code), &linjs.absInfo[code]) < 0)
+                continue;
+
+            linjs.absMap[code] = axisCount;
+            axisCount++;
+        }
+    }
+
+    _GLFWjoystick* js =
+        _glfwAllocJoystick(name, guid, axisCount, buttonCount, hatCount);
+    if (!js)
+    {
+        close(linjs.fd);
+        return GLFW_FALSE;
+    }
+
+    strncpy(linjs.path, path, sizeof(linjs.path) - 1);
+    memcpy(&js->linjs, &linjs, sizeof(linjs));
+
+    pollAbsState(js);
+
+    _glfwInputJoystick(js, GLFW_CONNECTED);
+    return GLFW_TRUE;
+}
+
+#undef isBitSet
+
+// Frees all resources associated with the specified joystick
+//
+static void closeJoystick(_GLFWjoystick* js)
+{
+    _glfwInputJoystick(js, GLFW_DISCONNECTED);
+    close(js->linjs.fd);
+    _glfwFreeJoystick(js);
+}
+
+// Lexically compare joysticks by name; used by qsort
+//
+static int compareJoysticks(const void* fp, const void* sp)
+{
+    const _GLFWjoystick* fj = fp;
+    const _GLFWjoystick* sj = sp;
+    return strcmp(fj->linjs.path, sj->linjs.path);
+}
+
+
+//////////////////////////////////////////////////////////////////////////
+//////                       GLFW internal API                      //////
+//////////////////////////////////////////////////////////////////////////
+
+// Initialize joystick interface
+//
+GLFWbool _glfwInitJoysticksLinux(void)
+{
+    const char* dirname = "/dev/input";
+
+    _glfw.linjs.inotify = inotify_init1(IN_NONBLOCK | IN_CLOEXEC);
+    if (_glfw.linjs.inotify > 0)
+    {
+        // HACK: Register for IN_ATTRIB to get notified when udev is done
+        //       This works well in practice but the true way is libudev
+
+        _glfw.linjs.watch = inotify_add_watch(_glfw.linjs.inotify,
+                                              dirname,
+                                              IN_CREATE | IN_ATTRIB | IN_DELETE);
+    }
+
+    // Continue without device connection notifications if inotify fails
+
+    if (regcomp(&_glfw.linjs.regex, "^event[0-9]\\+$", 0) != 0)
+    {
+        _glfwInputError(GLFW_PLATFORM_ERROR, "Linux: Failed to compile regex");
+        return GLFW_FALSE;
+    }
+
+    int count = 0;
+
+    DIR* dir = opendir(dirname);
+    if (dir)
+    {
+        struct dirent* entry;
+
+        while ((entry = readdir(dir)))
+        {
+            regmatch_t match;
+
+            if (regexec(&_glfw.linjs.regex, entry->d_name, 1, &match, 0) != 0)
+                continue;
+
+            char path[PATH_MAX];
+
+            snprintf(path, sizeof(path), "%s/%s", dirname, entry->d_name);
+
+            if (openJoystickDevice(path))
+                count++;
+        }
+
+        closedir(dir);
+    }
+
+    // Continue with no joysticks if enumeration fails
+
+    qsort(_glfw.joysticks, count, sizeof(_GLFWjoystick), compareJoysticks);
+    return GLFW_TRUE;
+}
+
+// Close all opened joystick handles
+//
+void _glfwTerminateJoysticksLinux(void)
+{
+    int jid;
+
+    for (jid = 0;  jid <= GLFW_JOYSTICK_LAST;  jid++)
+    {
+        _GLFWjoystick* js = _glfw.joysticks + jid;
+        if (js->connected)
+            closeJoystick(js);
+    }
+
+    regfree(&_glfw.linjs.regex);
+
+    if (_glfw.linjs.inotify > 0)
+    {
+        if (_glfw.linjs.watch > 0)
+            inotify_rm_watch(_glfw.linjs.inotify, _glfw.linjs.watch);
+
+        close(_glfw.linjs.inotify);
+    }
+}
+
+void _glfwDetectJoystickConnectionLinux(void)
+{
+    if (_glfw.linjs.inotify <= 0)
+        return;
+
+    ssize_t offset = 0;
+    char buffer[16384];
+    const ssize_t size = read(_glfw.linjs.inotify, buffer, sizeof(buffer));
+
+    while (size > offset)
+    {
+        regmatch_t match;
+        const struct inotify_event* e = (struct inotify_event*) (buffer + offset);
+
+        offset += sizeof(struct inotify_event) + e->len;
+
+        if (regexec(&_glfw.linjs.regex, e->name, 1, &match, 0) != 0)
+            continue;
+
+        char path[PATH_MAX];
+        snprintf(path, sizeof(path), "/dev/input/%s", e->name);
+
+        if (e->mask & (IN_CREATE | IN_ATTRIB))
+            openJoystickDevice(path);
+        else if (e->mask & IN_DELETE)
+        {
+            for (int jid = 0;  jid <= GLFW_JOYSTICK_LAST;  jid++)
+            {
+                if (strcmp(_glfw.joysticks[jid].linjs.path, path) == 0)
+                {
+                    closeJoystick(_glfw.joysticks + jid);
+                    break;
+                }
+            }
+        }
+    }
+}
+
+
+//////////////////////////////////////////////////////////////////////////
+//////                       GLFW platform API                      //////
+//////////////////////////////////////////////////////////////////////////
+
+int _glfwPlatformPollJoystick(_GLFWjoystick* js, int mode)
+{
+    // Read all queued events (non-blocking)
+    for (;;)
+    {
+        struct input_event e;
+
+        errno = 0;
+        if (read(js->linjs.fd, &e, sizeof(e)) < 0)
+        {
+            // Reset the joystick slot if the device was disconnected
+            if (errno == ENODEV)
+                closeJoystick(js);
+
+            break;
+        }
+
+        if (e.type == EV_SYN)
+        {
+            if (e.code == SYN_DROPPED)
+                _glfw.linjs.dropped = GLFW_TRUE;
+            else if (e.code == SYN_REPORT)
+            {
+                _glfw.linjs.dropped = GLFW_FALSE;
+                pollAbsState(js);
+            }
+        }
+
+        if (_glfw.linjs.dropped)
+            continue;
+
+        if (e.type == EV_KEY)
+            handleKeyEvent(js, e.code, e.value);
+        else if (e.type == EV_ABS)
+            handleAbsEvent(js, e.code, e.value);
+    }
+
+    return js->connected;
+}
+
+void _glfwPlatformUpdateGamepadGUID(char* guid)
+{
+}
+