services/surfaceflinger/RenderEngine/RenderEngine.cpp - android_frameworks_native - Gitiles

 /*
  * Copyright 2013 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.
  */

 #include <log/log.h>
 #include <ui/Rect.h>
 #include <ui/Region.h>

 #include "GLES20RenderEngine.h"
 #include "GLExtensions.h"
 #include "Image.h"
 #include "Mesh.h"
 #include "RenderEngine.h"

 #include <SurfaceFlinger.h>
 #include <vector>

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

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

 extern "C" EGLAPI const char* eglQueryStringImplementationANDROID(EGLDisplay dpy, EGLint name);

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

 RenderEngine::~RenderEngine() = default;

 namespace impl {

 std::unique_ptr<RenderEngine> RenderEngine::create(int hwcFormat, uint32_t featureFlags) {
     // initialize EGL for the default display
     EGLDisplay display = eglGetDisplay(EGL_DEFAULT_DISPLAY);
     if (!eglInitialize(display, nullptr, nullptr)) {
         LOG_ALWAYS_FATAL("failed to initialize EGL");
     }

     GLExtensions& extensions = GLExtensions::getInstance();
     extensions.initWithEGLStrings(eglQueryStringImplementationANDROID(display, EGL_VERSION),
                                   eglQueryStringImplementationANDROID(display, EGL_EXTENSIONS));

     // The code assumes that ES2 or later is available if this extension is
     // supported.
     EGLConfig config = EGL_NO_CONFIG;
     if (!extensions.hasNoConfigContext()) {
         config = chooseEglConfig(display, hwcFormat, /*logConfig*/ true);
     }

     EGLint renderableType = 0;
     if (config == EGL_NO_CONFIG) {
         renderableType = EGL_OPENGL_ES2_BIT;
     } else if (!eglGetConfigAttrib(display, config, EGL_RENDERABLE_TYPE, &renderableType)) {
         LOG_ALWAYS_FATAL("can't query EGLConfig RENDERABLE_TYPE");
     }
     EGLint contextClientVersion = 0;
     if (renderableType & EGL_OPENGL_ES2_BIT) {
         contextClientVersion = 2;
     } else if (renderableType & EGL_OPENGL_ES_BIT) {
         contextClientVersion = 1;
     } else {
         LOG_ALWAYS_FATAL("no supported EGL_RENDERABLE_TYPEs");
     }

     std::vector<EGLint> contextAttributes;
     contextAttributes.reserve(6);
     contextAttributes.push_back(EGL_CONTEXT_CLIENT_VERSION);
     contextAttributes.push_back(contextClientVersion);
     bool useContextPriority = overrideUseContextPriorityFromConfig(extensions.hasContextPriority());
     if (useContextPriority) {
         contextAttributes.push_back(EGL_CONTEXT_PRIORITY_LEVEL_IMG);
         contextAttributes.push_back(EGL_CONTEXT_PRIORITY_HIGH_IMG);
     }
     contextAttributes.push_back(EGL_NONE);

     EGLContext ctxt = eglCreateContext(display, config, nullptr, contextAttributes.data());

     // if can't create a GL context, we can only abort.
     LOG_ALWAYS_FATAL_IF(ctxt == EGL_NO_CONTEXT, "EGLContext creation failed");

     // now figure out what version of GL did we actually get
     // NOTE: a dummy surface is not needed if KHR_create_context is supported

     EGLConfig dummyConfig = config;
     if (dummyConfig == EGL_NO_CONFIG) {
         dummyConfig = chooseEglConfig(display, hwcFormat, /*logConfig*/ true);
     }
     EGLint attribs[] = {EGL_WIDTH, 1, EGL_HEIGHT, 1, EGL_NONE, EGL_NONE};
     EGLSurface dummy = eglCreatePbufferSurface(display, dummyConfig, attribs);
     LOG_ALWAYS_FATAL_IF(dummy == EGL_NO_SURFACE, "can't create dummy pbuffer");
     EGLBoolean success = eglMakeCurrent(display, dummy, dummy, ctxt);
     LOG_ALWAYS_FATAL_IF(!success, "can't make dummy pbuffer current");

     extensions.initWithGLStrings(glGetString(GL_VENDOR), glGetString(GL_RENDERER),
                                  glGetString(GL_VERSION), glGetString(GL_EXTENSIONS));

     GlesVersion version = parseGlesVersion(extensions.getVersion());

     // initialize the renderer while GL is current

     std::unique_ptr<RenderEngine> engine;
     switch (version) {
         case GLES_VERSION_1_0:
         case GLES_VERSION_1_1:
             LOG_ALWAYS_FATAL("SurfaceFlinger requires OpenGL ES 2.0 minimum to run.");
             break;
         case GLES_VERSION_2_0:
         case GLES_VERSION_3_0:
             engine = std::make_unique<GLES20RenderEngine>(featureFlags);
             break;
     }
     engine->setEGLHandles(display, config, ctxt);

     ALOGI("OpenGL ES informations:");
     ALOGI("vendor    : %s", extensions.getVendor());
     ALOGI("renderer  : %s", extensions.getRenderer());
     ALOGI("version   : %s", extensions.getVersion());
     ALOGI("extensions: %s", extensions.getExtensions());
     ALOGI("GL_MAX_TEXTURE_SIZE = %zu", engine->getMaxTextureSize());
     ALOGI("GL_MAX_VIEWPORT_DIMS = %zu", engine->getMaxViewportDims());

     eglMakeCurrent(display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
     eglDestroySurface(display, dummy);

     return engine;
 }

 bool RenderEngine::overrideUseContextPriorityFromConfig(bool useContextPriority) {
     OptionalBool ret;
     ISurfaceFlingerConfigs::getService()->useContextPriority([&ret](OptionalBool b) { ret = b; });
     if (ret.specified) {
         return ret.value;
     } else {
         return useContextPriority;
     }
 }

 RenderEngine::RenderEngine(uint32_t featureFlags)
       : mEGLDisplay(EGL_NO_DISPLAY),
         mEGLConfig(nullptr),
         mEGLContext(EGL_NO_CONTEXT),
         mFeatureFlags(featureFlags) {}

 RenderEngine::~RenderEngine() {
     eglMakeCurrent(mEGLDisplay, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
     eglTerminate(mEGLDisplay);
 }

 void RenderEngine::setEGLHandles(EGLDisplay display, EGLConfig config, EGLContext ctxt) {
     mEGLDisplay = display;
     mEGLConfig = config;
     mEGLContext = ctxt;
 }

 EGLDisplay RenderEngine::getEGLDisplay() const {
     return mEGLDisplay;
 }

 EGLConfig RenderEngine::getEGLConfig() const {
     return mEGLConfig;
 }

 bool RenderEngine::supportsImageCrop() const {
     return GLExtensions::getInstance().hasImageCrop();
 }

 bool RenderEngine::isCurrent() const {
     return mEGLDisplay == eglGetCurrentDisplay() && mEGLContext == eglGetCurrentContext();
 }

 std::unique_ptr<RE::Surface> RenderEngine::createSurface() {
     return std::make_unique<Surface>(*this);
 }

 std::unique_ptr<RE::Image> RenderEngine::createImage() {
     return std::make_unique<Image>(*this);
 }

 bool RenderEngine::setCurrentSurface(const android::RE::Surface& surface) {
     // Note: RE::Surface is an abstract interface. This implementation only ever
     // creates RE::impl::Surface's, so it is safe to just cast to the actual
     // type.
     return setCurrentSurface(static_cast<const android::RE::impl::Surface&>(surface));
 }

 bool RenderEngine::setCurrentSurface(const android::RE::impl::Surface& surface) {
     bool success = true;
     EGLSurface eglSurface = surface.getEGLSurface();
     if (eglSurface != eglGetCurrentSurface(EGL_DRAW)) {
         success = eglMakeCurrent(mEGLDisplay, eglSurface, eglSurface, mEGLContext) == EGL_TRUE;
         if (success && surface.getAsync()) {
             eglSwapInterval(mEGLDisplay, 0);
         }
     }

     return success;
 }

 void RenderEngine::resetCurrentSurface() {
     eglMakeCurrent(mEGLDisplay, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
 }

 base::unique_fd RenderEngine::flush() {
     if (!GLExtensions::getInstance().hasNativeFenceSync()) {
         return base::unique_fd();
     }

     EGLSyncKHR sync = eglCreateSyncKHR(mEGLDisplay, EGL_SYNC_NATIVE_FENCE_ANDROID, nullptr);
     if (sync == EGL_NO_SYNC_KHR) {
         ALOGW("failed to create EGL native fence sync: %#x", eglGetError());
         return base::unique_fd();
     }

     // native fence fd will not be populated until flush() is done.
     glFlush();

     // get the fence fd
     base::unique_fd fenceFd(eglDupNativeFenceFDANDROID(mEGLDisplay, sync));
     eglDestroySyncKHR(mEGLDisplay, sync);
     if (fenceFd == EGL_NO_NATIVE_FENCE_FD_ANDROID) {
         ALOGW("failed to dup EGL native fence sync: %#x", eglGetError());
     }

     return fenceFd;
 }

 bool RenderEngine::finish() {
     if (!GLExtensions::getInstance().hasFenceSync()) {
         ALOGW("no synchronization support");
         return false;
     }

     EGLSyncKHR sync = eglCreateSyncKHR(mEGLDisplay, EGL_SYNC_FENCE_KHR, nullptr);
     if (sync == EGL_NO_SYNC_KHR) {
         ALOGW("failed to create EGL fence sync: %#x", eglGetError());
         return false;
     }

     EGLint result = eglClientWaitSyncKHR(mEGLDisplay, sync, EGL_SYNC_FLUSH_COMMANDS_BIT_KHR,
                                          2000000000 /*2 sec*/);
     EGLint error = eglGetError();
     eglDestroySyncKHR(mEGLDisplay, sync);
     if (result != EGL_CONDITION_SATISFIED_KHR) {
         if (result == EGL_TIMEOUT_EXPIRED_KHR) {
             ALOGW("fence wait timed out");
         } else {
             ALOGW("error waiting on EGL fence: %#x", error);
         }
         return false;
     }

     return true;
 }

 bool RenderEngine::waitFence(base::unique_fd fenceFd) {
     if (!GLExtensions::getInstance().hasNativeFenceSync() ||
         !GLExtensions::getInstance().hasWaitSync()) {
         return false;
     }

     EGLint attribs[] = {EGL_SYNC_NATIVE_FENCE_FD_ANDROID, fenceFd, EGL_NONE};
     EGLSyncKHR sync = eglCreateSyncKHR(mEGLDisplay, EGL_SYNC_NATIVE_FENCE_ANDROID, attribs);
     if (sync == EGL_NO_SYNC_KHR) {
         ALOGE("failed to create EGL native fence sync: %#x", eglGetError());
         return false;
     }

     // fenceFd is now owned by EGLSync
     (void)fenceFd.release();

     // XXX: The spec draft is inconsistent as to whether this should return an
     // EGLint or void.  Ignore the return value for now, as it's not strictly
     // needed.
     eglWaitSyncKHR(mEGLDisplay, sync, 0);
     EGLint error = eglGetError();
     eglDestroySyncKHR(mEGLDisplay, sync);
     if (error != EGL_SUCCESS) {
         ALOGE("failed to wait for EGL native fence sync: %#x", error);
         return false;
     }

     return true;
 }

 void RenderEngine::checkErrors() const {
     do {
         // there could be more than one error flag
         GLenum error = glGetError();
         if (error == GL_NO_ERROR) break;
         ALOGE("GL error 0x%04x", int(error));
     } while (true);
 }

 RenderEngine::GlesVersion RenderEngine::parseGlesVersion(const char* str) {
     int major, minor;
     if (sscanf(str, "OpenGL ES-CM %d.%d", &major, &minor) != 2) {
         if (sscanf(str, "OpenGL ES %d.%d", &major, &minor) != 2) {
             ALOGW("Unable to parse GL_VERSION string: \"%s\"", str);
             return GLES_VERSION_1_0;
         }
     }

     if (major == 1 && minor == 0) return GLES_VERSION_1_0;
     if (major == 1 && minor >= 1) return GLES_VERSION_1_1;
     if (major == 2 && minor >= 0) return GLES_VERSION_2_0;
     if (major == 3 && minor >= 0) return GLES_VERSION_3_0;

     ALOGW("Unrecognized OpenGL ES version: %d.%d", major, minor);
     return GLES_VERSION_1_0;
 }

 void RenderEngine::fillRegionWithColor(const Region& region, uint32_t height, float red,
                                        float green, float blue, float alpha) {
     size_t c;
     Rect const* r = region.getArray(&c);
     Mesh mesh(Mesh::TRIANGLES, c * 6, 2);
     Mesh::VertexArray<vec2> position(mesh.getPositionArray<vec2>());
     for (size_t i = 0; i < c; i++, r++) {
         position[i * 6 + 0].x = r->left;
         position[i * 6 + 0].y = height - r->top;
         position[i * 6 + 1].x = r->left;
         position[i * 6 + 1].y = height - r->bottom;
         position[i * 6 + 2].x = r->right;
         position[i * 6 + 2].y = height - r->bottom;
         position[i * 6 + 3].x = r->left;
         position[i * 6 + 3].y = height - r->top;
         position[i * 6 + 4].x = r->right;
         position[i * 6 + 4].y = height - r->bottom;
         position[i * 6 + 5].x = r->right;
         position[i * 6 + 5].y = height - r->top;
     }
     setupFillWithColor(red, green, blue, alpha);
     drawMesh(mesh);
 }

 void RenderEngine::clearWithColor(float red, float green, float blue, float alpha) {
     glClearColor(red, green, blue, alpha);
     glClear(GL_COLOR_BUFFER_BIT);
 }

 void RenderEngine::setScissor(uint32_t left, uint32_t bottom, uint32_t right, uint32_t top) {
     glScissor(left, bottom, right, top);
     glEnable(GL_SCISSOR_TEST);
 }

 void RenderEngine::disableScissor() {
     glDisable(GL_SCISSOR_TEST);
 }

 void RenderEngine::genTextures(size_t count, uint32_t* names) {
     glGenTextures(count, names);
 }

 void RenderEngine::deleteTextures(size_t count, uint32_t const* names) {
     glDeleteTextures(count, names);
 }

 void RenderEngine::bindExternalTextureImage(uint32_t texName, const android::RE::Image& image) {
     // Note: RE::Image is an abstract interface. This implementation only ever
     // creates RE::impl::Image's, so it is safe to just cast to the actual type.
     return bindExternalTextureImage(texName, static_cast<const android::RE::impl::Image&>(image));
 }

 void RenderEngine::bindExternalTextureImage(uint32_t texName,
                                             const android::RE::impl::Image& image) {
     const GLenum target = GL_TEXTURE_EXTERNAL_OES;

     glBindTexture(target, texName);
     if (image.getEGLImage() != EGL_NO_IMAGE_KHR) {
         glEGLImageTargetTexture2DOES(target, static_cast<GLeglImageOES>(image.getEGLImage()));
     }
 }

 void RenderEngine::readPixels(size_t l, size_t b, size_t w, size_t h, uint32_t* pixels) {
     glReadPixels(l, b, w, h, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
 }

 void RenderEngine::dump(String8& result) {
     const GLExtensions& extensions = GLExtensions::getInstance();

     result.appendFormat("EGL implementation : %s\n", extensions.getEGLVersion());
     result.appendFormat("%s\n", extensions.getEGLExtensions());

     result.appendFormat("GLES: %s, %s, %s\n", extensions.getVendor(), extensions.getRenderer(),
                         extensions.getVersion());
     result.appendFormat("%s\n", extensions.getExtensions());
 }

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

 void RenderEngine::bindNativeBufferAsFrameBuffer(ANativeWindowBuffer* buffer,
                                                  RE::BindNativeBufferAsFramebuffer* bindHelper) {
     bindHelper->mImage = eglCreateImageKHR(mEGLDisplay, EGL_NO_CONTEXT, EGL_NATIVE_BUFFER_ANDROID,
                                            buffer, nullptr);
     if (bindHelper->mImage == EGL_NO_IMAGE_KHR) {
         bindHelper->mStatus = NO_MEMORY;
         return;
     }

     uint32_t glStatus;
     bindImageAsFramebuffer(bindHelper->mImage, &bindHelper->mTexName, &bindHelper->mFbName,
                            &glStatus);

     ALOGE_IF(glStatus != GL_FRAMEBUFFER_COMPLETE_OES, "glCheckFramebufferStatusOES error %d",
              glStatus);

     bindHelper->mStatus = glStatus == GL_FRAMEBUFFER_COMPLETE_OES ? NO_ERROR : BAD_VALUE;
 }

 void RenderEngine::unbindNativeBufferAsFrameBuffer(RE::BindNativeBufferAsFramebuffer* bindHelper) {
     if (bindHelper->mImage == EGL_NO_IMAGE_KHR) {
         return;
     }

     // back to main framebuffer
     unbindFramebuffer(bindHelper->mTexName, bindHelper->mFbName);
     eglDestroyImageKHR(mEGLDisplay, bindHelper->mImage);

     // Workaround for b/77935566 to force the EGL driver to release the
     // screenshot buffer
     setScissor(0, 0, 0, 0);
     clearWithColor(0.0, 0.0, 0.0, 0.0);
     disableScissor();
 }

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

 static status_t selectConfigForAttribute(EGLDisplay dpy, EGLint const* attrs, EGLint attribute,
                                          EGLint wanted, EGLConfig* outConfig) {
     EGLint numConfigs = -1, n = 0;
     eglGetConfigs(dpy, nullptr, 0, &numConfigs);
     EGLConfig* const configs = new EGLConfig[numConfigs];
     eglChooseConfig(dpy, attrs, configs, numConfigs, &n);

     if (n) {
         if (attribute != EGL_NONE) {
             for (int i = 0; i < n; i++) {
                 EGLint value = 0;
                 eglGetConfigAttrib(dpy, configs[i], attribute, &value);
                 if (wanted == value) {
                     *outConfig = configs[i];
                     delete[] configs;
                     return NO_ERROR;
                 }
             }
         } else {
             // just pick the first one
             *outConfig = configs[0];
             delete[] configs;
             return NO_ERROR;
         }
     }
     delete[] configs;
     return NAME_NOT_FOUND;
 }

 class EGLAttributeVector {
     struct Attribute;
     class Adder;
     friend class Adder;
     KeyedVector<Attribute, EGLint> mList;
     struct Attribute {
         Attribute() : v(0){};
         explicit Attribute(EGLint v) : v(v) {}
         EGLint v;
         bool operator<(const Attribute& other) const {
             // this places EGL_NONE at the end
             EGLint lhs(v);
             EGLint rhs(other.v);
             if (lhs == EGL_NONE) lhs = 0x7FFFFFFF;
             if (rhs == EGL_NONE) rhs = 0x7FFFFFFF;
             return lhs < rhs;
         }
     };
     class Adder {
         friend class EGLAttributeVector;
         EGLAttributeVector& v;
         EGLint attribute;
         Adder(EGLAttributeVector& v, EGLint attribute) : v(v), attribute(attribute) {}

     public:
         void operator=(EGLint value) {
             if (attribute != EGL_NONE) {
                 v.mList.add(Attribute(attribute), value);
             }
         }
         operator EGLint() const { return v.mList[attribute]; }
     };

 public:
     EGLAttributeVector() { mList.add(Attribute(EGL_NONE), EGL_NONE); }
     void remove(EGLint attribute) {
         if (attribute != EGL_NONE) {
             mList.removeItem(Attribute(attribute));
         }
     }
     Adder operator[](EGLint attribute) { return Adder(*this, attribute); }
     EGLint operator[](EGLint attribute) const { return mList[attribute]; }
     // cast-operator to (EGLint const*)
     operator EGLint const*() const { return &mList.keyAt(0).v; }
 };

 static status_t selectEGLConfig(EGLDisplay display, EGLint format, EGLint renderableType,
                                 EGLConfig* config) {
     // select our EGLConfig. It must support EGL_RECORDABLE_ANDROID if
     // it is to be used with WIFI displays
     status_t err;
     EGLint wantedAttribute;
     EGLint wantedAttributeValue;

     EGLAttributeVector attribs;
     if (renderableType) {
         attribs[EGL_RENDERABLE_TYPE] = renderableType;
         attribs[EGL_RECORDABLE_ANDROID] = EGL_TRUE;
         attribs[EGL_SURFACE_TYPE] = EGL_WINDOW_BIT | EGL_PBUFFER_BIT;
         attribs[EGL_FRAMEBUFFER_TARGET_ANDROID] = EGL_TRUE;
         attribs[EGL_RED_SIZE] = 8;
         attribs[EGL_GREEN_SIZE] = 8;
         attribs[EGL_BLUE_SIZE] = 8;
         attribs[EGL_ALPHA_SIZE] = 8;
         wantedAttribute = EGL_NONE;
         wantedAttributeValue = EGL_NONE;
     } else {
         // if no renderable type specified, fallback to a simplified query
         wantedAttribute = EGL_NATIVE_VISUAL_ID;
         wantedAttributeValue = format;
     }

     err = selectConfigForAttribute(display, attribs, wantedAttribute, wantedAttributeValue, config);
     if (err == NO_ERROR) {
         EGLint caveat;
         if (eglGetConfigAttrib(display, *config, EGL_CONFIG_CAVEAT, &caveat))
             ALOGW_IF(caveat == EGL_SLOW_CONFIG, "EGL_SLOW_CONFIG selected!");
     }

     return err;
 }

 EGLConfig RenderEngine::chooseEglConfig(EGLDisplay display, int format, bool logConfig) {
     status_t err;
     EGLConfig config;

     // First try to get an ES2 config
     err = selectEGLConfig(display, format, EGL_OPENGL_ES2_BIT, &config);
     if (err != NO_ERROR) {
         // If ES2 fails, try ES1
         err = selectEGLConfig(display, format, EGL_OPENGL_ES_BIT, &config);
         if (err != NO_ERROR) {
             // still didn't work, probably because we're on the emulator...
             // try a simplified query
             ALOGW("no suitable EGLConfig found, trying a simpler query");
             err = selectEGLConfig(display, format, 0, &config);
             if (err != NO_ERROR) {
                 // this EGL is too lame for android
                 LOG_ALWAYS_FATAL("no suitable EGLConfig found, giving up");
             }
         }
     }

     if (logConfig) {
         // print some debugging info
         EGLint r, g, b, a;
         eglGetConfigAttrib(display, config, EGL_RED_SIZE, &r);
         eglGetConfigAttrib(display, config, EGL_GREEN_SIZE, &g);
         eglGetConfigAttrib(display, config, EGL_BLUE_SIZE, &b);
         eglGetConfigAttrib(display, config, EGL_ALPHA_SIZE, &a);
         ALOGI("EGL information:");
         ALOGI("vendor    : %s", eglQueryString(display, EGL_VENDOR));
         ALOGI("version   : %s", eglQueryString(display, EGL_VERSION));
         ALOGI("extensions: %s", eglQueryString(display, EGL_EXTENSIONS));
         ALOGI("Client API: %s", eglQueryString(display, EGL_CLIENT_APIS) ?: "Not Supported");
         ALOGI("EGLSurface: %d-%d-%d-%d, config=%p", r, g, b, a, config);
     }

     return config;
 }

 void RenderEngine::primeCache() const {
     ProgramCache::getInstance().primeCache(mFeatureFlags & WIDE_COLOR_SUPPORT);
 }

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

 } // namespace impl
 } // namespace RE
 } // namespace android
	/*
	* Copyright 2013 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.
	*/

	#include <log/log.h>
	#include <ui/Rect.h>
	#include <ui/Region.h>

	#include "GLES20RenderEngine.h"
	#include "GLExtensions.h"
	#include "Image.h"
	#include "Mesh.h"
	#include "RenderEngine.h"

	#include <SurfaceFlinger.h>
	#include <vector>

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

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

	extern "C" EGLAPI const char* eglQueryStringImplementationANDROID(EGLDisplay dpy, EGLint name);

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

	RenderEngine::~RenderEngine() = default;

	namespace impl {

	std::unique_ptr<RenderEngine> RenderEngine::create(int hwcFormat, uint32_t featureFlags) {
	// initialize EGL for the default display
	EGLDisplay display = eglGetDisplay(EGL_DEFAULT_DISPLAY);
	if (!eglInitialize(display, nullptr, nullptr)) {
	LOG_ALWAYS_FATAL("failed to initialize EGL");
	}

	GLExtensions& extensions = GLExtensions::getInstance();
	extensions.initWithEGLStrings(eglQueryStringImplementationANDROID(display, EGL_VERSION),
	eglQueryStringImplementationANDROID(display, EGL_EXTENSIONS));

	// The code assumes that ES2 or later is available if this extension is
	// supported.
	EGLConfig config = EGL_NO_CONFIG;
	if (!extensions.hasNoConfigContext()) {
	config = chooseEglConfig(display, hwcFormat, /logConfig/ true);
	}

	EGLint renderableType = 0;
	if (config == EGL_NO_CONFIG) {
	renderableType = EGL_OPENGL_ES2_BIT;
	} else if (!eglGetConfigAttrib(display, config, EGL_RENDERABLE_TYPE, &renderableType)) {
	LOG_ALWAYS_FATAL("can't query EGLConfig RENDERABLE_TYPE");
	}
	EGLint contextClientVersion = 0;
	if (renderableType & EGL_OPENGL_ES2_BIT) {
	contextClientVersion = 2;
	} else if (renderableType & EGL_OPENGL_ES_BIT) {
	contextClientVersion = 1;
	} else {
	LOG_ALWAYS_FATAL("no supported EGL_RENDERABLE_TYPEs");
	}

	std::vector<EGLint> contextAttributes;
	contextAttributes.reserve(6);
	contextAttributes.push_back(EGL_CONTEXT_CLIENT_VERSION);
	contextAttributes.push_back(contextClientVersion);
	bool useContextPriority = overrideUseContextPriorityFromConfig(extensions.hasContextPriority());
	if (useContextPriority) {
	contextAttributes.push_back(EGL_CONTEXT_PRIORITY_LEVEL_IMG);
	contextAttributes.push_back(EGL_CONTEXT_PRIORITY_HIGH_IMG);
	}
	contextAttributes.push_back(EGL_NONE);

	EGLContext ctxt = eglCreateContext(display, config, nullptr, contextAttributes.data());

	// if can't create a GL context, we can only abort.
	LOG_ALWAYS_FATAL_IF(ctxt == EGL_NO_CONTEXT, "EGLContext creation failed");

	// now figure out what version of GL did we actually get
	// NOTE: a dummy surface is not needed if KHR_create_context is supported

	EGLConfig dummyConfig = config;
	if (dummyConfig == EGL_NO_CONFIG) {
	dummyConfig = chooseEglConfig(display, hwcFormat, /logConfig/ true);
	}
	EGLint attribs[] = {EGL_WIDTH, 1, EGL_HEIGHT, 1, EGL_NONE, EGL_NONE};
	EGLSurface dummy = eglCreatePbufferSurface(display, dummyConfig, attribs);
	LOG_ALWAYS_FATAL_IF(dummy == EGL_NO_SURFACE, "can't create dummy pbuffer");
	EGLBoolean success = eglMakeCurrent(display, dummy, dummy, ctxt);
	LOG_ALWAYS_FATAL_IF(!success, "can't make dummy pbuffer current");

	extensions.initWithGLStrings(glGetString(GL_VENDOR), glGetString(GL_RENDERER),
	glGetString(GL_VERSION), glGetString(GL_EXTENSIONS));

	GlesVersion version = parseGlesVersion(extensions.getVersion());

	// initialize the renderer while GL is current

	std::unique_ptr<RenderEngine> engine;
	switch (version) {
	case GLES_VERSION_1_0:
	case GLES_VERSION_1_1:
	LOG_ALWAYS_FATAL("SurfaceFlinger requires OpenGL ES 2.0 minimum to run.");
	break;
	case GLES_VERSION_2_0:
	case GLES_VERSION_3_0:
	engine = std::make_unique<GLES20RenderEngine>(featureFlags);
	break;
	}
	engine->setEGLHandles(display, config, ctxt);

	ALOGI("OpenGL ES informations:");
	ALOGI("vendor : %s", extensions.getVendor());
	ALOGI("renderer : %s", extensions.getRenderer());
	ALOGI("version : %s", extensions.getVersion());
	ALOGI("extensions: %s", extensions.getExtensions());
	ALOGI("GL_MAX_TEXTURE_SIZE = %zu", engine->getMaxTextureSize());
	ALOGI("GL_MAX_VIEWPORT_DIMS = %zu", engine->getMaxViewportDims());

	eglMakeCurrent(display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
	eglDestroySurface(display, dummy);

	return engine;
	}

	bool RenderEngine::overrideUseContextPriorityFromConfig(bool useContextPriority) {
	OptionalBool ret;
	ISurfaceFlingerConfigs::getService()->useContextPriority([&ret](OptionalBool b) { ret = b; });
	if (ret.specified) {
	return ret.value;
	} else {
	return useContextPriority;
	}
	}

	RenderEngine::RenderEngine(uint32_t featureFlags)
	: mEGLDisplay(EGL_NO_DISPLAY),
	mEGLConfig(nullptr),
	mEGLContext(EGL_NO_CONTEXT),
	mFeatureFlags(featureFlags) {}

	RenderEngine::~RenderEngine() {
	eglMakeCurrent(mEGLDisplay, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
	eglTerminate(mEGLDisplay);
	}

	void RenderEngine::setEGLHandles(EGLDisplay display, EGLConfig config, EGLContext ctxt) {
	mEGLDisplay = display;
	mEGLConfig = config;
	mEGLContext = ctxt;
	}

	EGLDisplay RenderEngine::getEGLDisplay() const {
	return mEGLDisplay;
	}

	EGLConfig RenderEngine::getEGLConfig() const {
	return mEGLConfig;
	}

	bool RenderEngine::supportsImageCrop() const {
	return GLExtensions::getInstance().hasImageCrop();
	}

	bool RenderEngine::isCurrent() const {
	return mEGLDisplay == eglGetCurrentDisplay() && mEGLContext == eglGetCurrentContext();
	}

	std::unique_ptr<RE::Surface> RenderEngine::createSurface() {
	return std::make_unique<Surface>(*this);
	}

	std::unique_ptr<RE::Image> RenderEngine::createImage() {
	return std::make_unique<Image>(*this);
	}

	bool RenderEngine::setCurrentSurface(const android::RE::Surface& surface) {
	// Note: RE::Surface is an abstract interface. This implementation only ever
	// creates RE::impl::Surface's, so it is safe to just cast to the actual
	// type.
	return setCurrentSurface(static_cast<const android::RE::impl::Surface&>(surface));
	}

	bool RenderEngine::setCurrentSurface(const android::RE::impl::Surface& surface) {
	bool success = true;
	EGLSurface eglSurface = surface.getEGLSurface();
	if (eglSurface != eglGetCurrentSurface(EGL_DRAW)) {
	success = eglMakeCurrent(mEGLDisplay, eglSurface, eglSurface, mEGLContext) == EGL_TRUE;
	if (success && surface.getAsync()) {
	eglSwapInterval(mEGLDisplay, 0);
	}
	}

	return success;
	}

	void RenderEngine::resetCurrentSurface() {
	eglMakeCurrent(mEGLDisplay, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
	}

	base::unique_fd RenderEngine::flush() {
	if (!GLExtensions::getInstance().hasNativeFenceSync()) {
	return base::unique_fd();
	}

	EGLSyncKHR sync = eglCreateSyncKHR(mEGLDisplay, EGL_SYNC_NATIVE_FENCE_ANDROID, nullptr);
	if (sync == EGL_NO_SYNC_KHR) {
	ALOGW("failed to create EGL native fence sync: %#x", eglGetError());
	return base::unique_fd();
	}

	// native fence fd will not be populated until flush() is done.
	glFlush();

	// get the fence fd
	base::unique_fd fenceFd(eglDupNativeFenceFDANDROID(mEGLDisplay, sync));
	eglDestroySyncKHR(mEGLDisplay, sync);
	if (fenceFd == EGL_NO_NATIVE_FENCE_FD_ANDROID) {
	ALOGW("failed to dup EGL native fence sync: %#x", eglGetError());
	}

	return fenceFd;
	}

	bool RenderEngine::finish() {
	if (!GLExtensions::getInstance().hasFenceSync()) {
	ALOGW("no synchronization support");
	return false;
	}

	EGLSyncKHR sync = eglCreateSyncKHR(mEGLDisplay, EGL_SYNC_FENCE_KHR, nullptr);
	if (sync == EGL_NO_SYNC_KHR) {
	ALOGW("failed to create EGL fence sync: %#x", eglGetError());
	return false;
	}

	EGLint result = eglClientWaitSyncKHR(mEGLDisplay, sync, EGL_SYNC_FLUSH_COMMANDS_BIT_KHR,
	2000000000 /2 sec/);
	EGLint error = eglGetError();
	eglDestroySyncKHR(mEGLDisplay, sync);
	if (result != EGL_CONDITION_SATISFIED_KHR) {
	if (result == EGL_TIMEOUT_EXPIRED_KHR) {
	ALOGW("fence wait timed out");
	} else {
	ALOGW("error waiting on EGL fence: %#x", error);
	}
	return false;
	}

	return true;
	}

	bool RenderEngine::waitFence(base::unique_fd fenceFd) {
	if (!GLExtensions::getInstance().hasNativeFenceSync() \|\|
	!GLExtensions::getInstance().hasWaitSync()) {
	return false;
	}

	EGLint attribs[] = {EGL_SYNC_NATIVE_FENCE_FD_ANDROID, fenceFd, EGL_NONE};
	EGLSyncKHR sync = eglCreateSyncKHR(mEGLDisplay, EGL_SYNC_NATIVE_FENCE_ANDROID, attribs);
	if (sync == EGL_NO_SYNC_KHR) {
	ALOGE("failed to create EGL native fence sync: %#x", eglGetError());
	return false;
	}

	// fenceFd is now owned by EGLSync
	(void)fenceFd.release();

	// XXX: The spec draft is inconsistent as to whether this should return an
	// EGLint or void. Ignore the return value for now, as it's not strictly
	// needed.
	eglWaitSyncKHR(mEGLDisplay, sync, 0);
	EGLint error = eglGetError();
	eglDestroySyncKHR(mEGLDisplay, sync);
	if (error != EGL_SUCCESS) {
	ALOGE("failed to wait for EGL native fence sync: %#x", error);
	return false;
	}

	return true;
	}

	void RenderEngine::checkErrors() const {
	do {
	// there could be more than one error flag
	GLenum error = glGetError();
	if (error == GL_NO_ERROR) break;
	ALOGE("GL error 0x%04x", int(error));
	} while (true);
	}

	RenderEngine::GlesVersion RenderEngine::parseGlesVersion(const char* str) {
	int major, minor;
	if (sscanf(str, "OpenGL ES-CM %d.%d", &major, &minor) != 2) {
	if (sscanf(str, "OpenGL ES %d.%d", &major, &minor) != 2) {
	ALOGW("Unable to parse GL_VERSION string: \"%s\"", str);
	return GLES_VERSION_1_0;
	}
	}

	if (major == 1 && minor == 0) return GLES_VERSION_1_0;
	if (major == 1 && minor >= 1) return GLES_VERSION_1_1;
	if (major == 2 && minor >= 0) return GLES_VERSION_2_0;
	if (major == 3 && minor >= 0) return GLES_VERSION_3_0;

	ALOGW("Unrecognized OpenGL ES version: %d.%d", major, minor);
	return GLES_VERSION_1_0;
	}

	void RenderEngine::fillRegionWithColor(const Region& region, uint32_t height, float red,
	float green, float blue, float alpha) {
	size_t c;
	Rect const* r = region.getArray(&c);
	Mesh mesh(Mesh::TRIANGLES, c * 6, 2);
	Mesh::VertexArray<vec2> position(mesh.getPositionArray<vec2>());
	for (size_t i = 0; i < c; i++, r++) {
	position[i * 6 + 0].x = r->left;
	position[i * 6 + 0].y = height - r->top;
	position[i * 6 + 1].x = r->left;
	position[i * 6 + 1].y = height - r->bottom;
	position[i * 6 + 2].x = r->right;
	position[i * 6 + 2].y = height - r->bottom;
	position[i * 6 + 3].x = r->left;
	position[i * 6 + 3].y = height - r->top;
	position[i * 6 + 4].x = r->right;
	position[i * 6 + 4].y = height - r->bottom;
	position[i * 6 + 5].x = r->right;
	position[i * 6 + 5].y = height - r->top;
	}
	setupFillWithColor(red, green, blue, alpha);
	drawMesh(mesh);
	}

	void RenderEngine::clearWithColor(float red, float green, float blue, float alpha) {
	glClearColor(red, green, blue, alpha);
	glClear(GL_COLOR_BUFFER_BIT);
	}

	void RenderEngine::setScissor(uint32_t left, uint32_t bottom, uint32_t right, uint32_t top) {
	glScissor(left, bottom, right, top);
	glEnable(GL_SCISSOR_TEST);
	}

	void RenderEngine::disableScissor() {
	glDisable(GL_SCISSOR_TEST);
	}

	void RenderEngine::genTextures(size_t count, uint32_t* names) {
	glGenTextures(count, names);
	}

	void RenderEngine::deleteTextures(size_t count, uint32_t const* names) {
	glDeleteTextures(count, names);
	}

	void RenderEngine::bindExternalTextureImage(uint32_t texName, const android::RE::Image& image) {
	// Note: RE::Image is an abstract interface. This implementation only ever
	// creates RE::impl::Image's, so it is safe to just cast to the actual type.
	return bindExternalTextureImage(texName, static_cast<const android::RE::impl::Image&>(image));
	}

	void RenderEngine::bindExternalTextureImage(uint32_t texName,
	const android::RE::impl::Image& image) {
	const GLenum target = GL_TEXTURE_EXTERNAL_OES;

	glBindTexture(target, texName);
	if (image.getEGLImage() != EGL_NO_IMAGE_KHR) {
	glEGLImageTargetTexture2DOES(target, static_cast<GLeglImageOES>(image.getEGLImage()));
	}
	}

	void RenderEngine::readPixels(size_t l, size_t b, size_t w, size_t h, uint32_t* pixels) {
	glReadPixels(l, b, w, h, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
	}

	void RenderEngine::dump(String8& result) {
	const GLExtensions& extensions = GLExtensions::getInstance();

	result.appendFormat("EGL implementation : %s\n", extensions.getEGLVersion());
	result.appendFormat("%s\n", extensions.getEGLExtensions());

	result.appendFormat("GLES: %s, %s, %s\n", extensions.getVendor(), extensions.getRenderer(),
	extensions.getVersion());
	result.appendFormat("%s\n", extensions.getExtensions());
	}

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

	void RenderEngine::bindNativeBufferAsFrameBuffer(ANativeWindowBuffer* buffer,
	RE::BindNativeBufferAsFramebuffer* bindHelper) {
	bindHelper->mImage = eglCreateImageKHR(mEGLDisplay, EGL_NO_CONTEXT, EGL_NATIVE_BUFFER_ANDROID,
	buffer, nullptr);
	if (bindHelper->mImage == EGL_NO_IMAGE_KHR) {
	bindHelper->mStatus = NO_MEMORY;
	return;
	}

	uint32_t glStatus;
	bindImageAsFramebuffer(bindHelper->mImage, &bindHelper->mTexName, &bindHelper->mFbName,
	&glStatus);

	ALOGE_IF(glStatus != GL_FRAMEBUFFER_COMPLETE_OES, "glCheckFramebufferStatusOES error %d",
	glStatus);

	bindHelper->mStatus = glStatus == GL_FRAMEBUFFER_COMPLETE_OES ? NO_ERROR : BAD_VALUE;
	}

	void RenderEngine::unbindNativeBufferAsFrameBuffer(RE::BindNativeBufferAsFramebuffer* bindHelper) {
	if (bindHelper->mImage == EGL_NO_IMAGE_KHR) {
	return;
	}

	// back to main framebuffer
	unbindFramebuffer(bindHelper->mTexName, bindHelper->mFbName);
	eglDestroyImageKHR(mEGLDisplay, bindHelper->mImage);

	// Workaround for b/77935566 to force the EGL driver to release the
	// screenshot buffer
	setScissor(0, 0, 0, 0);
	clearWithColor(0.0, 0.0, 0.0, 0.0);
	disableScissor();
	}

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

	static status_t selectConfigForAttribute(EGLDisplay dpy, EGLint const* attrs, EGLint attribute,
	EGLint wanted, EGLConfig* outConfig) {
	EGLint numConfigs = -1, n = 0;
	eglGetConfigs(dpy, nullptr, 0, &numConfigs);
	EGLConfig* const configs = new EGLConfig[numConfigs];
	eglChooseConfig(dpy, attrs, configs, numConfigs, &n);

	if (n) {
	if (attribute != EGL_NONE) {
	for (int i = 0; i < n; i++) {
	EGLint value = 0;
	eglGetConfigAttrib(dpy, configs[i], attribute, &value);
	if (wanted == value) {
	*outConfig = configs[i];
	delete[] configs;
	return NO_ERROR;
	}
	}
	} else {
	// just pick the first one
	*outConfig = configs[0];
	delete[] configs;
	return NO_ERROR;
	}
	}
	delete[] configs;
	return NAME_NOT_FOUND;
	}

	class EGLAttributeVector {
	struct Attribute;
	class Adder;
	friend class Adder;
	KeyedVector<Attribute, EGLint> mList;
	struct Attribute {
	Attribute() : v(0){};
	explicit Attribute(EGLint v) : v(v) {}
	EGLint v;
	bool operator<(const Attribute& other) const {
	// this places EGL_NONE at the end
	EGLint lhs(v);
	EGLint rhs(other.v);
	if (lhs == EGL_NONE) lhs = 0x7FFFFFFF;
	if (rhs == EGL_NONE) rhs = 0x7FFFFFFF;
	return lhs < rhs;
	}
	};
	class Adder {
	friend class EGLAttributeVector;
	EGLAttributeVector& v;
	EGLint attribute;
	Adder(EGLAttributeVector& v, EGLint attribute) : v(v), attribute(attribute) {}

	public:
	void operator=(EGLint value) {
	if (attribute != EGL_NONE) {
	v.mList.add(Attribute(attribute), value);
	}
	}
	operator EGLint() const { return v.mList[attribute]; }
	};

	public:
	EGLAttributeVector() { mList.add(Attribute(EGL_NONE), EGL_NONE); }
	void remove(EGLint attribute) {
	if (attribute != EGL_NONE) {
	mList.removeItem(Attribute(attribute));
	}
	}
	Adder operator[](EGLint attribute) { return Adder(*this, attribute); }
	EGLint operator[](EGLint attribute) const { return mList[attribute]; }
	// cast-operator to (EGLint const*)
	operator EGLint const*() const { return &mList.keyAt(0).v; }
	};

	static status_t selectEGLConfig(EGLDisplay display, EGLint format, EGLint renderableType,
	EGLConfig* config) {
	// select our EGLConfig. It must support EGL_RECORDABLE_ANDROID if
	// it is to be used with WIFI displays
	status_t err;
	EGLint wantedAttribute;
	EGLint wantedAttributeValue;

	EGLAttributeVector attribs;
	if (renderableType) {
	attribs[EGL_RENDERABLE_TYPE] = renderableType;
	attribs[EGL_RECORDABLE_ANDROID] = EGL_TRUE;
	attribs[EGL_SURFACE_TYPE] = EGL_WINDOW_BIT \| EGL_PBUFFER_BIT;
	attribs[EGL_FRAMEBUFFER_TARGET_ANDROID] = EGL_TRUE;
	attribs[EGL_RED_SIZE] = 8;
	attribs[EGL_GREEN_SIZE] = 8;
	attribs[EGL_BLUE_SIZE] = 8;
	attribs[EGL_ALPHA_SIZE] = 8;
	wantedAttribute = EGL_NONE;
	wantedAttributeValue = EGL_NONE;
	} else {
	// if no renderable type specified, fallback to a simplified query
	wantedAttribute = EGL_NATIVE_VISUAL_ID;
	wantedAttributeValue = format;
	}

	err = selectConfigForAttribute(display, attribs, wantedAttribute, wantedAttributeValue, config);
	if (err == NO_ERROR) {
	EGLint caveat;
	if (eglGetConfigAttrib(display, *config, EGL_CONFIG_CAVEAT, &caveat))
	ALOGW_IF(caveat == EGL_SLOW_CONFIG, "EGL_SLOW_CONFIG selected!");
	}

	return err;
	}

	EGLConfig RenderEngine::chooseEglConfig(EGLDisplay display, int format, bool logConfig) {
	status_t err;
	EGLConfig config;

	// First try to get an ES2 config
	err = selectEGLConfig(display, format, EGL_OPENGL_ES2_BIT, &config);
	if (err != NO_ERROR) {
	// If ES2 fails, try ES1
	err = selectEGLConfig(display, format, EGL_OPENGL_ES_BIT, &config);
	if (err != NO_ERROR) {
	// still didn't work, probably because we're on the emulator...
	// try a simplified query
	ALOGW("no suitable EGLConfig found, trying a simpler query");
	err = selectEGLConfig(display, format, 0, &config);
	if (err != NO_ERROR) {
	// this EGL is too lame for android
	LOG_ALWAYS_FATAL("no suitable EGLConfig found, giving up");
	}
	}
	}

	if (logConfig) {
	// print some debugging info
	EGLint r, g, b, a;
	eglGetConfigAttrib(display, config, EGL_RED_SIZE, &r);
	eglGetConfigAttrib(display, config, EGL_GREEN_SIZE, &g);
	eglGetConfigAttrib(display, config, EGL_BLUE_SIZE, &b);
	eglGetConfigAttrib(display, config, EGL_ALPHA_SIZE, &a);
	ALOGI("EGL information:");
	ALOGI("vendor : %s", eglQueryString(display, EGL_VENDOR));
	ALOGI("version : %s", eglQueryString(display, EGL_VERSION));
	ALOGI("extensions: %s", eglQueryString(display, EGL_EXTENSIONS));
	ALOGI("Client API: %s", eglQueryString(display, EGL_CLIENT_APIS) ?: "Not Supported");
	ALOGI("EGLSurface: %d-%d-%d-%d, config=%p", r, g, b, a, config);
	}

	return config;
	}

	void RenderEngine::primeCache() const {
	ProgramCache::getInstance().primeCache(mFeatureFlags & WIDE_COLOR_SUPPORT);
	}

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

	} // namespace impl
	} // namespace RE
	} // namespace android