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/**
* Functions for choosing and opening/loading device drivers.
*/
#include <assert.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "eglconfig.h"
#include "eglcontext.h"
#include "egldefines.h"
#include "egldisplay.h"
#include "egldriver.h"
#include "eglglobals.h"
#include "egllog.h"
#include "eglmisc.h"
#include "eglmode.h"
#include "eglscreen.h"
#include "eglstring.h"
#include "eglsurface.h"
#include "eglimage.h"
#if defined(_EGL_PLATFORM_POSIX)
#include <dlfcn.h>
#include <sys/types.h>
#include <dirent.h>
#include <unistd.h>
#endif
/**
* Wrappers for dlopen/dlclose()
*/
#if defined(_EGL_PLATFORM_WINDOWS)
/* XXX Need to decide how to do dynamic name lookup on Windows */
static const char DefaultDriverName[] = "TBD";
typedef HMODULE lib_handle;
static HMODULE
open_library(const char *filename)
{
return LoadLibrary(filename);
}
static void
close_library(HMODULE lib)
{
FreeLibrary(lib);
}
static const char *
library_suffix(void)
{
return ".dll";
}
#elif defined(_EGL_PLATFORM_POSIX)
static const char DefaultDriverName[] = "egl_glx";
typedef void * lib_handle;
static void *
open_library(const char *filename)
{
return dlopen(filename, RTLD_LAZY);
}
static void
close_library(void *lib)
{
dlclose(lib);
}
static const char *
library_suffix(void)
{
return ".so";
}
#else /* _EGL_PLATFORM_NO_OS */
static const char DefaultDriverName[] = "builtin";
typedef void *lib_handle;
static INLINE void *
open_library(const char *filename)
{
return (void *) filename;
}
static INLINE void
close_library(void *lib)
{
}
static const char *
library_suffix(void)
{
return NULL;
}
#endif
#define NUM_PROBE_CACHE_SLOTS 8
static struct {
EGLint keys[NUM_PROBE_CACHE_SLOTS];
const void *values[NUM_PROBE_CACHE_SLOTS];
} _eglProbeCache;
/**
* Open the named driver and find its bootstrap function: _eglMain().
*/
static _EGLMain_t
_eglOpenLibrary(const char *driverPath, lib_handle *handle)
{
lib_handle lib;
_EGLMain_t mainFunc = NULL;
const char *error = "unknown error";
assert(driverPath);
_eglLog(_EGL_DEBUG, "dlopen(%s)", driverPath);
lib = open_library(driverPath);
#if defined(_EGL_PLATFORM_WINDOWS)
/* XXX untested */
if (lib)
mainFunc = (_EGLMain_t) GetProcAddress(lib, "_eglMain");
#elif defined(_EGL_PLATFORM_POSIX)
if (lib) {
union {
_EGLMain_t func;
void *ptr;
} tmp = { NULL };
/* direct cast gives a warning when compiled with -pedantic */
tmp.ptr = dlsym(lib, "_eglMain");
mainFunc = tmp.func;
if (!mainFunc)
error = dlerror();
}
else {
error = dlerror();
}
#else /* _EGL_PLATFORM_NO_OS */
/* must be the default driver name */
if (strcmp(driverPath, DefaultDriverName) == 0)
mainFunc = (_EGLMain_t) _eglMain;
else
error = "not builtin driver";
#endif
if (!lib) {
_eglLog(_EGL_WARNING, "Could not open driver %s (%s)",
driverPath, error);
if (!getenv("EGL_DRIVER"))
_eglLog(_EGL_WARNING,
"The driver can be overridden by setting EGL_DRIVER");
return NULL;
}
if (!mainFunc) {
_eglLog(_EGL_WARNING, "_eglMain not found in %s (%s)",
driverPath, error);
if (lib)
close_library(lib);
return NULL;
}
*handle = lib;
return mainFunc;
}
/**
* Load the named driver.
*/
static _EGLDriver *
_eglLoadDriver(const char *path, const char *args)
{
_EGLMain_t mainFunc;
lib_handle lib;
_EGLDriver *drv = NULL;
mainFunc = _eglOpenLibrary(path, &lib);
if (!mainFunc)
return NULL;
drv = mainFunc(args);
if (!drv) {
if (lib)
close_library(lib);
return NULL;
}
if (!drv->Name) {
_eglLog(_EGL_WARNING, "Driver loaded from %s has no name", path);
drv->Name = "UNNAMED";
}
drv->Path = _eglstrdup(path);
drv->Args = (args) ? _eglstrdup(args) : NULL;
if (!drv->Path || (args && !drv->Args)) {
if (drv->Path)
free((char *) drv->Path);
if (drv->Args)
free((char *) drv->Args);
drv->Unload(drv);
if (lib)
close_library(lib);
return NULL;
}
drv->LibHandle = lib;
return drv;
}
/**
* Match a display to a preloaded driver.
*
* The matching is done by finding the driver with the highest score.
*/
_EGLDriver *
_eglMatchDriver(_EGLDisplay *dpy)
{
_EGLDriver *best_drv = NULL;
EGLint best_score = -1, i;
/*
* this function is called after preloading and the drivers never change
* after preloading.
*/
for (i = 0; i < _eglGlobal.NumDrivers; i++) {
_EGLDriver *drv = _eglGlobal.Drivers[i];
EGLint score;
score = (drv->Probe) ? drv->Probe(drv, dpy) : 0;
if (score > best_score) {
if (best_drv) {
_eglLog(_EGL_DEBUG, "driver %s has higher score than %s",
drv->Name, best_drv->Name);
}
best_drv = drv;
best_score = score;
/* perfect match */
if (score >= 100)
break;
}
}
return best_drv;
}
/**
* A loader function for use with _eglPreloadForEach. The loader data is the
* filename of the driver. This function stops on the first valid driver.
*/
static EGLBoolean
_eglLoaderFile(const char *dir, size_t len, void *loader_data)
{
_EGLDriver *drv;
char path[1024];
const char *filename = (const char *) loader_data;
size_t flen = strlen(filename);
/* make a full path */
if (len + flen + 2 > sizeof(path))
return EGL_TRUE;
if (len) {
memcpy(path, dir, len);
path[len++] = '/';
}
memcpy(path + len, filename, flen);
len += flen;
path[len] = '\0';
drv = _eglLoadDriver(path, NULL);
/* fix the path and load again */
if (!drv && library_suffix()) {
const char *suffix = library_suffix();
size_t slen = strlen(suffix);
const char *p;
EGLBoolean need_suffix;
p = filename + flen - slen;
need_suffix = (p < filename || strcmp(p, suffix) != 0);
if (need_suffix && len + slen + 1 <= sizeof(path)) {
strcpy(path + len, suffix);
drv = _eglLoadDriver(path, NULL);
}
}
if (!drv)
return EGL_TRUE;
/* remember the driver and stop */
_eglGlobal.Drivers[_eglGlobal.NumDrivers++] = drv;
return EGL_FALSE;
}
/**
* A loader function for use with _eglPreloadForEach. The loader data is the
* pattern (prefix) of the files to look for.
*/
static EGLBoolean
_eglLoaderPattern(const char *dir, size_t len, void *loader_data)
{
#if defined(_EGL_PLATFORM_POSIX)
const char *prefix, *suffix;
size_t prefix_len, suffix_len;
DIR *dirp;
struct dirent *dirent;
char path[1024];
if (len + 2 > sizeof(path))
return EGL_TRUE;
if (len) {
memcpy(path, dir, len);
path[len++] = '/';
}
path[len] = '\0';
dirp = opendir(path);
if (!dirp)
return EGL_TRUE;
prefix = (const char *) loader_data;
prefix_len = strlen(prefix);
suffix = library_suffix();
suffix_len = (suffix) ? strlen(suffix) : 0;
while ((dirent = readdir(dirp))) {
_EGLDriver *drv;
size_t dirent_len = strlen(dirent->d_name);
const char *p;
/* match the prefix */
if (strncmp(dirent->d_name, prefix, prefix_len) != 0)
continue;
/* match the suffix */
if (suffix) {
p = dirent->d_name + dirent_len - suffix_len;
if (p < dirent->d_name || strcmp(p, suffix) != 0)
continue;
}
/* make a full path and load the driver */
if (len + dirent_len + 1 <= sizeof(path)) {
strcpy(path + len, dirent->d_name);
drv = _eglLoadDriver(path, NULL);
if (drv)
_eglGlobal.Drivers[_eglGlobal.NumDrivers++] = drv;
}
}
closedir(dirp);
return EGL_TRUE;
#else /* _EGL_PLATFORM_POSIX */
/* stop immediately */
return EGL_FALSE;
#endif
}
/**
* Run the preload function on each driver directory and return the number of
* drivers loaded.
*
* The process may end prematurely if the callback function returns false.
*/
static EGLint
_eglPreloadForEach(const char *search_path,
EGLBoolean (*loader)(const char *, size_t, void *),
void *loader_data)
{
const char *cur, *next;
size_t len;
EGLint num_drivers = _eglGlobal.NumDrivers;
cur = search_path;
while (cur) {
next = strchr(cur, ':');
len = (next) ? next - cur : strlen(cur);
if (!loader(cur, len, loader_data))
break;
cur = (next) ? next + 1 : NULL;
}
return (_eglGlobal.NumDrivers - num_drivers);
}
/**
* Return a list of colon-separated driver directories.
*/
static const char *
_eglGetSearchPath(void)
{
static const char *search_path;
#if defined(_EGL_PLATFORM_POSIX) || defined(_EGL_PLATFORM_WINDOWS)
if (!search_path) {
static char buffer[1024];
const char *p;
int ret;
p = getenv("EGL_DRIVERS_PATH");
#if defined(_EGL_PLATFORM_POSIX)
if (p && (geteuid() != getuid() || getegid() != getgid())) {
_eglLog(_EGL_DEBUG,
"ignore EGL_DRIVERS_PATH for setuid/setgid binaries");
p = NULL;
}
#endif /* _EGL_PLATFORM_POSIX */
if (p) {
ret = snprintf(buffer, sizeof(buffer),
"%s:%s", p, _EGL_DRIVER_SEARCH_DIR);
if (ret > 0 && ret < sizeof(buffer))
search_path = buffer;
}
}
if (!search_path)
search_path = _EGL_DRIVER_SEARCH_DIR;
#else
search_path = "";
#endif
return search_path;
}
/**
* Preload a user driver.
*
* A user driver can be specified by EGL_DRIVER.
*/
static EGLBoolean
_eglPreloadUserDriver(void)
{
const char *search_path = _eglGetSearchPath();
char *env;
env = getenv("EGL_DRIVER");
#if defined(_EGL_PLATFORM_POSIX)
if (env && strchr(env, '/')) {
search_path = "";
if ((geteuid() != getuid() || getegid() != getgid())) {
_eglLog(_EGL_DEBUG,
"ignore EGL_DRIVER for setuid/setgid binaries");
env = NULL;
}
}
#endif /* _EGL_PLATFORM_POSIX */
if (!env)
return EGL_FALSE;
if (!_eglPreloadForEach(search_path, _eglLoaderFile, (void *) env)) {
_eglLog(_EGL_WARNING, "EGL_DRIVER is set to an invalid driver");
return EGL_FALSE;
}
return EGL_TRUE;
}
/**
* Preload display drivers.
*
* Display drivers are a set of drivers that support a certain display system.
* The display system may be specified by EGL_DISPLAY.
*
* FIXME This makes libEGL a memory hog if an user driver is not specified and
* there are many display drivers.
*/
static EGLBoolean
_eglPreloadDisplayDrivers(void)
{
const char *dpy;
char prefix[32];
int ret;
dpy = getenv("EGL_DISPLAY");
if (!dpy || !dpy[0])
dpy = _EGL_DEFAULT_DISPLAY;
if (!dpy || !dpy[0])
return EGL_FALSE;
ret = snprintf(prefix, sizeof(prefix), "egl_%s_", dpy);
if (ret < 0 || ret >= sizeof(prefix))
return EGL_FALSE;
return (_eglPreloadForEach(_eglGetSearchPath(),
_eglLoaderPattern, (void *) prefix) > 0);
}
/**
* Preload the default driver.
*/
static EGLBoolean
_eglPreloadDefaultDriver(void)
{
return (_eglPreloadForEach(_eglGetSearchPath(),
_eglLoaderFile, (void *) DefaultDriverName) > 0);
}
/**
* Preload drivers.
*
* This function loads the driver modules and creates the corresponding
* _EGLDriver objects.
*/
EGLBoolean
_eglPreloadDrivers(void)
{
EGLBoolean loaded;
/* protect the preloading process */
_eglLockMutex(_eglGlobal.Mutex);
/* already preloaded */
if (_eglGlobal.NumDrivers) {
_eglUnlockMutex(_eglGlobal.Mutex);
return EGL_TRUE;
}
loaded = (_eglPreloadUserDriver() ||
_eglPreloadDisplayDrivers() ||
_eglPreloadDefaultDriver());
_eglUnlockMutex(_eglGlobal.Mutex);
return loaded;
}
/**
* Unload preloaded drivers.
*/
void
_eglUnloadDrivers(void)
{
EGLint i;
/* this is called at atexit time */
for (i = 0; i < _eglGlobal.NumDrivers; i++) {
_EGLDriver *drv = _eglGlobal.Drivers[i];
lib_handle handle = drv->LibHandle;
if (drv->Path)
free((char *) drv->Path);
if (drv->Args)
free((char *) drv->Args);
/* destroy driver */
if (drv->Unload)
drv->Unload(drv);
if (handle)
close_library(handle);
_eglGlobal.Drivers[i] = NULL;
}
_eglGlobal.NumDrivers = 0;
}
/**
* Plug all the available fallback routines into the given driver's
* dispatch table.
*/
void
_eglInitDriverFallbacks(_EGLDriver *drv)
{
/* If a pointer is set to NULL, then the device driver _really_ has
* to implement it.
*/
drv->API.Initialize = NULL;
drv->API.Terminate = NULL;
drv->API.GetConfigs = _eglGetConfigs;
drv->API.ChooseConfig = _eglChooseConfig;
drv->API.GetConfigAttrib = _eglGetConfigAttrib;
drv->API.CreateContext = _eglCreateContext;
drv->API.DestroyContext = _eglDestroyContext;
drv->API.MakeCurrent = _eglMakeCurrent;
drv->API.QueryContext = _eglQueryContext;
drv->API.CreateWindowSurface = _eglCreateWindowSurface;
drv->API.CreatePixmapSurface = _eglCreatePixmapSurface;
drv->API.CreatePbufferSurface = _eglCreatePbufferSurface;
drv->API.DestroySurface = _eglDestroySurface;
drv->API.QuerySurface = _eglQuerySurface;
drv->API.SurfaceAttrib = _eglSurfaceAttrib;
drv->API.BindTexImage = _eglBindTexImage;
drv->API.ReleaseTexImage = _eglReleaseTexImage;
drv->API.SwapInterval = _eglSwapInterval;
drv->API.SwapBuffers = _eglSwapBuffers;
drv->API.CopyBuffers = _eglCopyBuffers;
drv->API.QueryString = _eglQueryString;
drv->API.WaitClient = _eglWaitClient;
drv->API.WaitNative = _eglWaitNative;
#ifdef EGL_MESA_screen_surface
drv->API.ChooseModeMESA = _eglChooseModeMESA;
drv->API.GetModesMESA = _eglGetModesMESA;
drv->API.GetModeAttribMESA = _eglGetModeAttribMESA;
drv->API.GetScreensMESA = _eglGetScreensMESA;
drv->API.CreateScreenSurfaceMESA = _eglCreateScreenSurfaceMESA;
drv->API.ShowScreenSurfaceMESA = _eglShowScreenSurfaceMESA;
drv->API.ScreenPositionMESA = _eglScreenPositionMESA;
drv->API.QueryScreenMESA = _eglQueryScreenMESA;
drv->API.QueryScreenSurfaceMESA = _eglQueryScreenSurfaceMESA;
drv->API.QueryScreenModeMESA = _eglQueryScreenModeMESA;
drv->API.QueryModeStringMESA = _eglQueryModeStringMESA;
#endif /* EGL_MESA_screen_surface */
#ifdef EGL_VERSION_1_2
drv->API.CreatePbufferFromClientBuffer = _eglCreatePbufferFromClientBuffer;
#endif /* EGL_VERSION_1_2 */
#ifdef EGL_KHR_image_base
drv->API.CreateImageKHR = _eglCreateImageKHR;
drv->API.DestroyImageKHR = _eglDestroyImageKHR;
#endif /* EGL_KHR_image_base */
}
/**
* Invoke a callback function on each EGL search path.
*
* The first argument of the callback function is the name of the search path.
* The second argument is the length of the name.
*/
void
_eglSearchPathForEach(EGLBoolean (*callback)(const char *, size_t, void *),
void *callback_data)
{
const char *search_path = _eglGetSearchPath();
_eglPreloadForEach(search_path, callback, callback_data);
}
/**
* Set the probe cache at the given key.
*
* A key, instead of a _EGLDriver, is used to allow the probe cache to be share
* by multiple drivers.
*/
void
_eglSetProbeCache(EGLint key, const void *val)
{
EGLint idx;
for (idx = 0; idx < NUM_PROBE_CACHE_SLOTS; idx++) {
if (!_eglProbeCache.keys[idx] || _eglProbeCache.keys[idx] == key)
break;
}
assert(key > 0);
assert(idx < NUM_PROBE_CACHE_SLOTS);
_eglProbeCache.keys[idx] = key;
_eglProbeCache.values[idx] = val;
}
/**
* Return the probe cache at the given key.
*/
const void *
_eglGetProbeCache(EGLint key)
{
EGLint idx;
for (idx = 0; idx < NUM_PROBE_CACHE_SLOTS; idx++) {
if (!_eglProbeCache.keys[idx] || _eglProbeCache.keys[idx] == key)
break;
}
return (idx < NUM_PROBE_CACHE_SLOTS && _eglProbeCache.keys[idx] == key) ?
_eglProbeCache.values[idx] : NULL;
}
|