opengl/libs/EGL/egl_display.cpp - LeafOS-Project/android_frameworks_native - Gitiles

 /*
  ** Copyright 2007, The Android Open Source Project
  **
  ** Licensed under the Apache License, Version 2.0 (the "License");
  ** you may not use this file except in compliance with the License.
  ** You may obtain a copy of the License at
  **
  **     http://www.apache.org/licenses/LICENSE-2.0
  **
  ** Unless required by applicable law or agreed to in writing, software
  ** distributed under the License is distributed on an "AS IS" BASIS,
  ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  ** See the License for the specific language governing permissions and
  ** limitations under the License.
  */

 #define __STDC_LIMIT_MACROS 1
 #define ATRACE_TAG ATRACE_TAG_GRAPHICS

 #include "egl_display.h"

 #include "../egl_impl.h"

 #include <private/EGL/display.h>

 #include "egl_cache.h"
 #include "egl_object.h"
 #include "egl_tls.h"
 #include "egl_trace.h"
 #include "Loader.h"
 #include <cutils/properties.h>

 #include <android/hardware/configstore/1.0/ISurfaceFlingerConfigs.h>
 #include <configstore/Utils.h>

 using namespace android::hardware::configstore;
 using namespace android::hardware::configstore::V1_0;

 // ----------------------------------------------------------------------------
 namespace android {
 // ----------------------------------------------------------------------------

 static char const * const sVendorString     = "Android";
 static char const * const sVersionString    = "1.4 Android META-EGL";
 static char const * const sClientApiString  = "OpenGL_ES";

 extern char const * const gBuiltinExtensionString;
 extern char const * const gExtensionString;

 extern void setGLHooksThreadSpecific(gl_hooks_t const *value);

 // ----------------------------------------------------------------------------

 static bool findExtension(const char* exts, const char* name, size_t nameLen) {
     if (exts) {
         for (const char* match = strstr(exts, name); match; match = strstr(match + nameLen, name)) {
             if (match[nameLen] == '\0' || match[nameLen] == ' ') {
                 return true;
             }
         }
     }
     return false;
 }

 int egl_get_init_count(EGLDisplay dpy) {
     egl_display_t* eglDisplay = egl_display_t::get(dpy);
     return eglDisplay ? eglDisplay->getRefsCount() : 0;
 }

 egl_display_t egl_display_t::sDisplay[NUM_DISPLAYS];

 egl_display_t::egl_display_t() :
     magic('_dpy'), finishOnSwap(false), traceGpuCompletion(false), refs(0), eglIsInitialized(false) {
 }

 egl_display_t::~egl_display_t() {
     magic = 0;
     egl_cache_t::get()->terminate();
 }

 egl_display_t* egl_display_t::get(EGLDisplay dpy) {
     uintptr_t index = uintptr_t(dpy)-1U;
     if (index >= NUM_DISPLAYS || !sDisplay[index].isValid()) {
         return nullptr;
     }
     return &sDisplay[index];
 }

 void egl_display_t::addObject(egl_object_t* object) {
     std::lock_guard<std::mutex> _l(lock);
     objects.insert(object);
 }

 void egl_display_t::removeObject(egl_object_t* object) {
     std::lock_guard<std::mutex> _l(lock);
     objects.erase(object);
 }

 bool egl_display_t::getObject(egl_object_t* object) const {
     std::lock_guard<std::mutex> _l(lock);
     if (objects.find(object) != objects.end()) {
         if (object->getDisplay() == this) {
             object->incRef();
             return true;
         }
     }
     return false;
 }

 EGLDisplay egl_display_t::getFromNativeDisplay(EGLNativeDisplayType disp) {
     if (uintptr_t(disp) >= NUM_DISPLAYS)
         return NULL;

     return sDisplay[uintptr_t(disp)].getDisplay(disp);
 }

 EGLDisplay egl_display_t::getDisplay(EGLNativeDisplayType display) {

     std::lock_guard<std::mutex> _l(lock);
     ATRACE_CALL();

     // get our driver loader
     Loader& loader(Loader::getInstance());

     egl_connection_t* const cnx = &gEGLImpl;
     if (cnx->dso && disp.dpy == EGL_NO_DISPLAY) {
         EGLDisplay dpy = cnx->egl.eglGetDisplay(display);
         disp.dpy = dpy;
         if (dpy == EGL_NO_DISPLAY) {
             loader.close(cnx->dso);
             cnx->dso = NULL;
         }
     }

     return EGLDisplay(uintptr_t(display) + 1U);
 }

 EGLBoolean egl_display_t::initialize(EGLint *major, EGLint *minor) {

     { // scope for refLock
         std::unique_lock<std::mutex> _l(refLock);
         refs++;
         if (refs > 1) {
             if (major != NULL)
                 *major = VERSION_MAJOR;
             if (minor != NULL)
                 *minor = VERSION_MINOR;
             while(!eglIsInitialized) {
                 refCond.wait(_l);
             }
             return EGL_TRUE;
         }
         while(eglIsInitialized) {
             refCond.wait(_l);
         }
     }

     { // scope for lock
         std::lock_guard<std::mutex> _l(lock);

         setGLHooksThreadSpecific(&gHooksNoContext);

         // initialize each EGL and
         // build our own extension string first, based on the extension we know
         // and the extension supported by our client implementation

         egl_connection_t* const cnx = &gEGLImpl;
         cnx->major = -1;
         cnx->minor = -1;
         if (cnx->dso) {
             EGLDisplay idpy = disp.dpy;
             if (cnx->egl.eglInitialize(idpy, &cnx->major, &cnx->minor)) {
                 //ALOGD("initialized dpy=%p, ver=%d.%d, cnx=%p",
                 //        idpy, cnx->major, cnx->minor, cnx);

                 // display is now initialized
                 disp.state = egl_display_t::INITIALIZED;

                 // get the query-strings for this display for each implementation
                 disp.queryString.vendor = cnx->egl.eglQueryString(idpy,
                         EGL_VENDOR);
                 disp.queryString.version = cnx->egl.eglQueryString(idpy,
                         EGL_VERSION);
                 disp.queryString.extensions = cnx->egl.eglQueryString(idpy,
                         EGL_EXTENSIONS);
                 disp.queryString.clientApi = cnx->egl.eglQueryString(idpy,
                         EGL_CLIENT_APIS);

             } else {
                 ALOGW("eglInitialize(%p) failed (%s)", idpy,
                         egl_tls_t::egl_strerror(cnx->egl.eglGetError()));
             }
         }

         // the query strings are per-display
         mVendorString = sVendorString;
         mVersionString = sVersionString;
         mClientApiString = sClientApiString;

         mExtensionString = gBuiltinExtensionString;

         bool wideColorBoardConfig =
                 getBool<ISurfaceFlingerConfigs, &ISurfaceFlingerConfigs::hasWideColorDisplay>(
                         false);

         // Add wide-color extensions if device can support wide-color
         if (wideColorBoardConfig) {
             mExtensionString.append(
                     "EGL_EXT_gl_colorspace_scrgb EGL_EXT_gl_colorspace_scrgb_linear "
                     "EGL_EXT_gl_colorspace_display_p3_linear EGL_EXT_gl_colorspace_display_p3 ");
         }

         char const* start = gExtensionString;
         do {
             // length of the extension name
             size_t len = strcspn(start, " ");
             if (len) {
                 // NOTE: we could avoid the copy if we had strnstr.
                 const std::string ext(start, len);
                 if (findExtension(disp.queryString.extensions, ext.c_str(), len)) {
                     mExtensionString.append(ext + " ");
                 }
                 // advance to the next extension name, skipping the space.
                 start += len;
                 start += (*start == ' ') ? 1 : 0;
             }
         } while (*start != '\0');

         egl_cache_t::get()->initialize(this);

         char value[PROPERTY_VALUE_MAX];
         property_get("debug.egl.finish", value, "0");
         if (atoi(value)) {
             finishOnSwap = true;
         }

         property_get("debug.egl.traceGpuCompletion", value, "0");
         if (atoi(value)) {
             traceGpuCompletion = true;
         }

         if (major != NULL)
             *major = VERSION_MAJOR;
         if (minor != NULL)
             *minor = VERSION_MINOR;
     }

     { // scope for refLock
         std::unique_lock<std::mutex> _l(refLock);
         eglIsInitialized = true;
         refCond.notify_all();
     }

     return EGL_TRUE;
 }

 EGLBoolean egl_display_t::terminate() {

     { // scope for refLock
         std::unique_lock<std::mutex> _rl(refLock);
         if (refs == 0) {
             /*
              * From the EGL spec (3.2):
              * "Termination of a display that has already been terminated,
              *  (...), is allowed, but the only effect of such a call is
              *  to return EGL_TRUE (...)
              */
             return EGL_TRUE;
         }

         // this is specific to Android, display termination is ref-counted.
         refs--;
         if (refs > 0) {
             return EGL_TRUE;
         }
     }

     EGLBoolean res = EGL_FALSE;

     { // scope for lock
         std::lock_guard<std::mutex> _l(lock);

         egl_connection_t* const cnx = &gEGLImpl;
         if (cnx->dso && disp.state == egl_display_t::INITIALIZED) {
             if (cnx->egl.eglTerminate(disp.dpy) == EGL_FALSE) {
                 ALOGW("eglTerminate(%p) failed (%s)", disp.dpy,
                         egl_tls_t::egl_strerror(cnx->egl.eglGetError()));
             }
             // REVISIT: it's unclear what to do if eglTerminate() fails
             disp.state = egl_display_t::TERMINATED;
             res = EGL_TRUE;
         }

         // Reset the extension string since it will be regenerated if we get
         // reinitialized.
         mExtensionString.clear();

         // Mark all objects remaining in the list as terminated, unless
         // there are no reference to them, it which case, we're free to
         // delete them.
         size_t count = objects.size();
         ALOGW_IF(count, "eglTerminate() called w/ %zu objects remaining", count);
         for (auto o : objects) {
             o->destroy();
         }

         // this marks all object handles are "terminated"
         objects.clear();
     }

     { // scope for refLock
         std::unique_lock<std::mutex> _rl(refLock);
         eglIsInitialized = false;
         refCond.notify_all();
     }

     return res;
 }

 void egl_display_t::loseCurrent(egl_context_t * cur_c)
 {
     if (cur_c) {
         egl_display_t* display = cur_c->getDisplay();
         if (display) {
             display->loseCurrentImpl(cur_c);
         }
     }
 }

 void egl_display_t::loseCurrentImpl(egl_context_t * cur_c)
 {
     // by construction, these are either 0 or valid (possibly terminated)
     // it should be impossible for these to be invalid
     ContextRef _cur_c(cur_c);
     SurfaceRef _cur_r(cur_c ? get_surface(cur_c->read) : NULL);
     SurfaceRef _cur_d(cur_c ? get_surface(cur_c->draw) : NULL);

     { // scope for the lock
         std::lock_guard<std::mutex> _l(lock);
         cur_c->onLooseCurrent();

     }

     // This cannot be called with the lock held because it might end-up
     // calling back into EGL (in particular when a surface is destroyed
     // it calls ANativeWindow::disconnect
     _cur_c.release();
     _cur_r.release();
     _cur_d.release();
 }

 EGLBoolean egl_display_t::makeCurrent(egl_context_t* c, egl_context_t* cur_c,
         EGLSurface draw, EGLSurface read, EGLContext /*ctx*/,
         EGLSurface impl_draw, EGLSurface impl_read, EGLContext impl_ctx)
 {
     EGLBoolean result;

     // by construction, these are either 0 or valid (possibly terminated)
     // it should be impossible for these to be invalid
     ContextRef _cur_c(cur_c);
     SurfaceRef _cur_r(cur_c ? get_surface(cur_c->read) : NULL);
     SurfaceRef _cur_d(cur_c ? get_surface(cur_c->draw) : NULL);

     { // scope for the lock
         std::lock_guard<std::mutex> _l(lock);
         if (c) {
             result = c->cnx->egl.eglMakeCurrent(
                     disp.dpy, impl_draw, impl_read, impl_ctx);
             if (result == EGL_TRUE) {
                 c->onMakeCurrent(draw, read);
             }
         } else {
             result = cur_c->cnx->egl.eglMakeCurrent(
                     disp.dpy, impl_draw, impl_read, impl_ctx);
             if (result == EGL_TRUE) {
                 cur_c->onLooseCurrent();
             }
         }
     }

     if (result == EGL_TRUE) {
         // This cannot be called with the lock held because it might end-up
         // calling back into EGL (in particular when a surface is destroyed
         // it calls ANativeWindow::disconnect
         _cur_c.release();
         _cur_r.release();
         _cur_d.release();
     }

     return result;
 }

 bool egl_display_t::haveExtension(const char* name, size_t nameLen) const {
     if (!nameLen) {
         nameLen = strlen(name);
     }
     return findExtension(mExtensionString.c_str(), name, nameLen);
 }

 // ----------------------------------------------------------------------------
 }; // namespace android
 // ----------------------------------------------------------------------------
	/*
	** Copyright 2007, The Android Open Source Project
	**
	** Licensed under the Apache License, Version 2.0 (the "License");
	** you may not use this file except in compliance with the License.
	** You may obtain a copy of the License at
	**
	** http://www.apache.org/licenses/LICENSE-2.0
	**
	** Unless required by applicable law or agreed to in writing, software
	** distributed under the License is distributed on an "AS IS" BASIS,
	** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	** See the License for the specific language governing permissions and
	** limitations under the License.
	*/

	#define __STDC_LIMIT_MACROS 1
	#define ATRACE_TAG ATRACE_TAG_GRAPHICS

	#include "egl_display.h"

	#include "../egl_impl.h"

	#include <private/EGL/display.h>

	#include "egl_cache.h"
	#include "egl_object.h"
	#include "egl_tls.h"
	#include "egl_trace.h"
	#include "Loader.h"
	#include <cutils/properties.h>

	#include <android/hardware/configstore/1.0/ISurfaceFlingerConfigs.h>
	#include <configstore/Utils.h>

	using namespace android::hardware::configstore;
	using namespace android::hardware::configstore::V1_0;

	// ----------------------------------------------------------------------------
	namespace android {
	// ----------------------------------------------------------------------------

	static char const * const sVendorString = "Android";
	static char const * const sVersionString = "1.4 Android META-EGL";
	static char const * const sClientApiString = "OpenGL_ES";

	extern char const * const gBuiltinExtensionString;
	extern char const * const gExtensionString;

	extern void setGLHooksThreadSpecific(gl_hooks_t const *value);

	// ----------------------------------------------------------------------------

	static bool findExtension(const char* exts, const char* name, size_t nameLen) {
	if (exts) {
	for (const char* match = strstr(exts, name); match; match = strstr(match + nameLen, name)) {
	if (match[nameLen] == '\0' \|\| match[nameLen] == ' ') {
	return true;
	}
	}
	}
	return false;
	}

	int egl_get_init_count(EGLDisplay dpy) {
	egl_display_t* eglDisplay = egl_display_t::get(dpy);
	return eglDisplay ? eglDisplay->getRefsCount() : 0;
	}

	egl_display_t egl_display_t::sDisplay[NUM_DISPLAYS];

	egl_display_t::egl_display_t() :
	magic('_dpy'), finishOnSwap(false), traceGpuCompletion(false), refs(0), eglIsInitialized(false) {
	}

	egl_display_t::~egl_display_t() {
	magic = 0;
	egl_cache_t::get()->terminate();
	}

	egl_display_t* egl_display_t::get(EGLDisplay dpy) {
	uintptr_t index = uintptr_t(dpy)-1U;
	if (index >= NUM_DISPLAYS \|\| !sDisplay[index].isValid()) {
	return nullptr;
	}
	return &sDisplay[index];
	}

	void egl_display_t::addObject(egl_object_t* object) {
	std::lock_guard<std::mutex> _l(lock);
	objects.insert(object);
	}

	void egl_display_t::removeObject(egl_object_t* object) {
	std::lock_guard<std::mutex> _l(lock);
	objects.erase(object);
	}

	bool egl_display_t::getObject(egl_object_t* object) const {
	std::lock_guard<std::mutex> _l(lock);
	if (objects.find(object) != objects.end()) {
	if (object->getDisplay() == this) {
	object->incRef();
	return true;
	}
	}
	return false;
	}

	EGLDisplay egl_display_t::getFromNativeDisplay(EGLNativeDisplayType disp) {
	if (uintptr_t(disp) >= NUM_DISPLAYS)
	return NULL;

	return sDisplay[uintptr_t(disp)].getDisplay(disp);
	}

	EGLDisplay egl_display_t::getDisplay(EGLNativeDisplayType display) {

	std::lock_guard<std::mutex> _l(lock);
	ATRACE_CALL();

	// get our driver loader
	Loader& loader(Loader::getInstance());

	egl_connection_t* const cnx = &gEGLImpl;
	if (cnx->dso && disp.dpy == EGL_NO_DISPLAY) {
	EGLDisplay dpy = cnx->egl.eglGetDisplay(display);
	disp.dpy = dpy;
	if (dpy == EGL_NO_DISPLAY) {
	loader.close(cnx->dso);
	cnx->dso = NULL;
	}
	}

	return EGLDisplay(uintptr_t(display) + 1U);
	}

	EGLBoolean egl_display_t::initialize(EGLint major, EGLint minor) {

	{ // scope for refLock
	std::unique_lock<std::mutex> _l(refLock);
	refs++;
	if (refs > 1) {
	if (major != NULL)
	*major = VERSION_MAJOR;
	if (minor != NULL)
	*minor = VERSION_MINOR;
	while(!eglIsInitialized) {
	refCond.wait(_l);
	}
	return EGL_TRUE;
	}
	while(eglIsInitialized) {
	refCond.wait(_l);
	}
	}

	{ // scope for lock
	std::lock_guard<std::mutex> _l(lock);

	setGLHooksThreadSpecific(&gHooksNoContext);

	// initialize each EGL and
	// build our own extension string first, based on the extension we know
	// and the extension supported by our client implementation

	egl_connection_t* const cnx = &gEGLImpl;
	cnx->major = -1;
	cnx->minor = -1;
	if (cnx->dso) {
	EGLDisplay idpy = disp.dpy;
	if (cnx->egl.eglInitialize(idpy, &cnx->major, &cnx->minor)) {
	//ALOGD("initialized dpy=%p, ver=%d.%d, cnx=%p",
	// idpy, cnx->major, cnx->minor, cnx);

	// display is now initialized
	disp.state = egl_display_t::INITIALIZED;

	// get the query-strings for this display for each implementation
	disp.queryString.vendor = cnx->egl.eglQueryString(idpy,
	EGL_VENDOR);
	disp.queryString.version = cnx->egl.eglQueryString(idpy,
	EGL_VERSION);
	disp.queryString.extensions = cnx->egl.eglQueryString(idpy,
	EGL_EXTENSIONS);
	disp.queryString.clientApi = cnx->egl.eglQueryString(idpy,
	EGL_CLIENT_APIS);

	} else {
	ALOGW("eglInitialize(%p) failed (%s)", idpy,
	egl_tls_t::egl_strerror(cnx->egl.eglGetError()));
	}
	}

	// the query strings are per-display
	mVendorString = sVendorString;
	mVersionString = sVersionString;
	mClientApiString = sClientApiString;

	mExtensionString = gBuiltinExtensionString;

	bool wideColorBoardConfig =
	getBool<ISurfaceFlingerConfigs, &ISurfaceFlingerConfigs::hasWideColorDisplay>(
	false);

	// Add wide-color extensions if device can support wide-color
	if (wideColorBoardConfig) {
	mExtensionString.append(
	"EGL_EXT_gl_colorspace_scrgb EGL_EXT_gl_colorspace_scrgb_linear "
	"EGL_EXT_gl_colorspace_display_p3_linear EGL_EXT_gl_colorspace_display_p3 ");
	}

	char const* start = gExtensionString;
	do {
	// length of the extension name
	size_t len = strcspn(start, " ");
	if (len) {
	// NOTE: we could avoid the copy if we had strnstr.
	const std::string ext(start, len);
	if (findExtension(disp.queryString.extensions, ext.c_str(), len)) {
	mExtensionString.append(ext + " ");
	}
	// advance to the next extension name, skipping the space.
	start += len;
	start += (*start == ' ') ? 1 : 0;
	}
	} while (*start != '\0');

	egl_cache_t::get()->initialize(this);

	char value[PROPERTY_VALUE_MAX];
	property_get("debug.egl.finish", value, "0");
	if (atoi(value)) {
	finishOnSwap = true;
	}

	property_get("debug.egl.traceGpuCompletion", value, "0");
	if (atoi(value)) {
	traceGpuCompletion = true;
	}

	if (major != NULL)
	*major = VERSION_MAJOR;
	if (minor != NULL)
	*minor = VERSION_MINOR;
	}

	{ // scope for refLock
	std::unique_lock<std::mutex> _l(refLock);
	eglIsInitialized = true;
	refCond.notify_all();
	}

	return EGL_TRUE;
	}

	EGLBoolean egl_display_t::terminate() {

	{ // scope for refLock
	std::unique_lock<std::mutex> _rl(refLock);
	if (refs == 0) {
	/*
	* From the EGL spec (3.2):
	* "Termination of a display that has already been terminated,
	* (...), is allowed, but the only effect of such a call is
	* to return EGL_TRUE (...)
	*/
	return EGL_TRUE;
	}

	// this is specific to Android, display termination is ref-counted.
	refs--;
	if (refs > 0) {
	return EGL_TRUE;
	}
	}

	EGLBoolean res = EGL_FALSE;

	{ // scope for lock
	std::lock_guard<std::mutex> _l(lock);

	egl_connection_t* const cnx = &gEGLImpl;
	if (cnx->dso && disp.state == egl_display_t::INITIALIZED) {
	if (cnx->egl.eglTerminate(disp.dpy) == EGL_FALSE) {
	ALOGW("eglTerminate(%p) failed (%s)", disp.dpy,
	egl_tls_t::egl_strerror(cnx->egl.eglGetError()));
	}
	// REVISIT: it's unclear what to do if eglTerminate() fails
	disp.state = egl_display_t::TERMINATED;
	res = EGL_TRUE;
	}

	// Reset the extension string since it will be regenerated if we get
	// reinitialized.
	mExtensionString.clear();

	// Mark all objects remaining in the list as terminated, unless
	// there are no reference to them, it which case, we're free to
	// delete them.
	size_t count = objects.size();
	ALOGW_IF(count, "eglTerminate() called w/ %zu objects remaining", count);
	for (auto o : objects) {
	o->destroy();
	}

	// this marks all object handles are "terminated"
	objects.clear();
	}

	{ // scope for refLock
	std::unique_lock<std::mutex> _rl(refLock);
	eglIsInitialized = false;
	refCond.notify_all();
	}

	return res;
	}

	void egl_display_t::loseCurrent(egl_context_t * cur_c)
	{
	if (cur_c) {
	egl_display_t* display = cur_c->getDisplay();
	if (display) {
	display->loseCurrentImpl(cur_c);
	}
	}
	}

	void egl_display_t::loseCurrentImpl(egl_context_t * cur_c)
	{
	// by construction, these are either 0 or valid (possibly terminated)
	// it should be impossible for these to be invalid
	ContextRef _cur_c(cur_c);
	SurfaceRef _cur_r(cur_c ? get_surface(cur_c->read) : NULL);
	SurfaceRef _cur_d(cur_c ? get_surface(cur_c->draw) : NULL);

	{ // scope for the lock
	std::lock_guard<std::mutex> _l(lock);
	cur_c->onLooseCurrent();

	}

	// This cannot be called with the lock held because it might end-up
	// calling back into EGL (in particular when a surface is destroyed
	// it calls ANativeWindow::disconnect
	_cur_c.release();
	_cur_r.release();
	_cur_d.release();
	}

	EGLBoolean egl_display_t::makeCurrent(egl_context_t* c, egl_context_t* cur_c,
	EGLSurface draw, EGLSurface read, EGLContext /ctx/,
	EGLSurface impl_draw, EGLSurface impl_read, EGLContext impl_ctx)
	{
	EGLBoolean result;

	// by construction, these are either 0 or valid (possibly terminated)
	// it should be impossible for these to be invalid
	ContextRef _cur_c(cur_c);
	SurfaceRef _cur_r(cur_c ? get_surface(cur_c->read) : NULL);
	SurfaceRef _cur_d(cur_c ? get_surface(cur_c->draw) : NULL);

	{ // scope for the lock
	std::lock_guard<std::mutex> _l(lock);
	if (c) {
	result = c->cnx->egl.eglMakeCurrent(
	disp.dpy, impl_draw, impl_read, impl_ctx);
	if (result == EGL_TRUE) {
	c->onMakeCurrent(draw, read);
	}
	} else {
	result = cur_c->cnx->egl.eglMakeCurrent(
	disp.dpy, impl_draw, impl_read, impl_ctx);
	if (result == EGL_TRUE) {
	cur_c->onLooseCurrent();
	}
	}
	}

	if (result == EGL_TRUE) {
	// This cannot be called with the lock held because it might end-up
	// calling back into EGL (in particular when a surface is destroyed
	// it calls ANativeWindow::disconnect
	_cur_c.release();
	_cur_r.release();
	_cur_d.release();
	}

	return result;
	}

	bool egl_display_t::haveExtension(const char* name, size_t nameLen) const {
	if (!nameLen) {
	nameLen = strlen(name);
	}
	return findExtension(mExtensionString.c_str(), name, nameLen);
	}

	// ----------------------------------------------------------------------------
	}; // namespace android
	// ----------------------------------------------------------------------------