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/**
* Functions for choosing and opening/loading device drivers.
*/
#include <assert.h>
#include <string.h>
#include <dlfcn.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"
#if defined(_EGL_PLATFORM_X)
#include "eglx.h"
#elif defined(_EGL_PLATFORM_WINDOWS)
/* XXX to do */
#elif defined(_EGL_PLATFORM_WINCE)
/* XXX to do */
#endif
const char *DefaultDriverName = ":0";
const char *SysFS = "/sys/class";
/**
* Given a card number, use sysfs to determine the DRI driver name.
*/
static const char *
_eglChooseDRMDriver(int card)
{
#if 0
return _eglstrdup("libEGLdri");
#else
char path[2000], driverName[2000];
FILE *f;
int length;
snprintf(path, sizeof(path), "%s/drm/card%d/dri_library_name", SysFS, card);
f = fopen(path, "r");
if (!f)
return NULL;
fgets(driverName, sizeof(driverName), f);
fclose(f);
if ((length = strlen(driverName)) > 1) {
/* remove the trailing newline from sysfs */
driverName[length - 1] = '\0';
strncat(driverName, "_dri", sizeof(driverName));
return _eglstrdup(driverName);
}
else {
return NULL;
}
#endif
}
/**
* Determine/return the name of the driver to use for the given _EGLDisplay.
*
* Try to be clever and determine if nativeDisplay is an Xlib Display
* ptr or a string (naming a driver or screen number, etc).
*
* If the first character is ':' we interpret it as a screen or card index
* number (i.e. ":0" or ":1", etc)
* Else if the first character is '!' we interpret it as specific driver name
* (i.e. "!r200" or "!i830".
*
* Whatever follows ':' is copied and put into dpy->DriverArgs.
*
* The caller may free() the returned string.
*/
const char *
_eglChooseDriver(_EGLDisplay *dpy)
{
const char *displayString = (const char *) dpy->NativeDisplay;
const char *driverName = NULL;
if (!displayString) {
/* choose a default */
displayString = DefaultDriverName;
}
/* extract default DriverArgs = whatever follows ':' */
if (displayString[0] == '!' ||
displayString[0] == ':') {
const char *args = strchr(displayString, ':');
if (args)
dpy->DriverArgs = _eglstrdup(args + 1);
}
/* determine driver name now */
if (displayString && displayString[0] == ':' &&
(displayString[1] >= '0' && displayString[1] <= '9') &&
!displayString[2]) {
int card = atoi(displayString + 1);
driverName = _eglChooseDRMDriver(card);
}
else if (displayString && displayString[0] == '!') {
/* use user-specified driver name */
driverName = _eglstrdup(displayString + 1);
/* truncate driverName at ':' if present */
{
char *args = strchr(driverName, ':');
if (args) {
*args = 0;
}
}
}
else {
/* NativeDisplay is not a string! */
#if defined(_EGL_PLATFORM_X)
driverName = _xeglChooseDriver(dpy);
#elif defined(_EGL_PLATFORM_WINDOWS)
/* XXX to do */
driverName = _weglChooseDriver(dpy);
#elif defined(_EGL_PLATFORM_WINCE)
/* XXX to do */
#endif
}
return driverName;
}
/**
* Open/load the named driver and call its bootstrap function: _eglMain().
* By the time this function is called, the dpy->DriverName should have
* been determined.
*
* \return new _EGLDriver object.
*/
_EGLDriver *
_eglOpenDriver(_EGLDisplay *dpy, const char *driverName, const char *args)
{
_EGLDriver *drv;
_EGLMain_t mainFunc;
void *lib;
char driverFilename[1000];
assert(driverName);
/* XXX also prepend a directory path??? */
sprintf(driverFilename, "%s.so", driverName);
_eglLog(_EGL_DEBUG, "dlopen(%s)", driverFilename);
lib = dlopen(driverFilename, RTLD_NOW);
if (!lib) {
_eglLog(_EGL_WARNING, "Could not open %s (%s)",
driverFilename, dlerror());
return NULL;
}
mainFunc = (_EGLMain_t) dlsym(lib, "_eglMain");
if (!mainFunc) {
_eglLog(_EGL_WARNING, "_eglMain not found in %s", driverFilename);
dlclose(lib);
return NULL;
}
drv = mainFunc(dpy, args);
if (!drv) {
dlclose(lib);
return NULL;
}
/* with a recurvise open you want the inner most handle */
if (!drv->LibHandle)
drv->LibHandle = lib;
else
dlclose(lib);
drv->Display = dpy;
return drv;
}
EGLBoolean
_eglCloseDriver(_EGLDriver *drv, EGLDisplay dpy)
{
void *handle = drv->LibHandle;
EGLBoolean b;
_eglLog(_EGL_INFO, "Closing driver");
/*
* XXX check for currently bound context/surfaces and delete them?
*/
b = drv->API.Terminate(drv, dpy);
dlclose(handle);
return b;
}
/**
* Given a display handle, return the _EGLDriver for that display.
*/
_EGLDriver *
_eglLookupDriver(EGLDisplay dpy)
{
_EGLDisplay *d = _eglLookupDisplay(dpy);
if (d)
return d->Driver;
else
return NULL;
}
/**
* 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.WaitGL = _eglWaitGL;
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 */
}
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