services/surfaceflinger/RenderEngine/RenderEngine.cpp - third_party/android/platform/frameworks/native - Git at Google

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

 #include "RenderEngine.h"
 #include "GLES10RenderEngine.h"
 #include "GLES11RenderEngine.h"
 #include "GLES20RenderEngine.h"
 #include "GLExtensions.h"
 #include "Mesh.h"

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

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

 static bool findExtension(const char* exts, const char* name) {
     if (!exts)
         return false;
     size_t len = strlen(name);

     const char* pos = exts;
     while ((pos = strstr(pos, name)) != NULL) {
         if (pos[len] == '\0' || pos[len] == ' ')
             return true;
         pos += len;
     }

     return false;
 }

 RenderEngine* RenderEngine::create(EGLDisplay display, int hwcFormat) {
     // EGL_ANDROIDX_no_config_context is an experimental extension with no
     // written specification. It will be replaced by something more formal.
     // SurfaceFlinger is using it to allow a single EGLContext to render to
     // both a 16-bit primary display framebuffer and a 32-bit virtual display
     // framebuffer.
     //
     // The code assumes that ES2 or later is available if this extension is
     // supported.
     EGLConfig config = EGL_NO_CONFIG;
     if (!findExtension(
             eglQueryStringImplementationANDROID(display, EGL_EXTENSIONS),
             "EGL_ANDROIDX_no_config_context")) {
         config = chooseEglConfig(display, hwcFormat);
     }

     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");
     }

     // Also create our EGLContext
     EGLint contextAttributes[] = {
             EGL_CONTEXT_CLIENT_VERSION, contextClientVersion,      // MUST be first
 #ifdef EGL_IMG_context_priority
 #ifdef HAS_CONTEXT_PRIORITY
 #warning "using EGL_IMG_context_priority"
             EGL_CONTEXT_PRIORITY_LEVEL_IMG, EGL_CONTEXT_PRIORITY_HIGH_IMG,
 #endif
 #endif
             EGL_NONE, EGL_NONE
     };
     EGLContext ctxt = eglCreateContext(display, config, NULL, contextAttributes);

     // 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);
     }
     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");

     GLExtensions& extensions(GLExtensions::getInstance());
     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

     RenderEngine* engine = NULL;
     switch (version) {
     case GLES_VERSION_1_0:
         engine = new GLES10RenderEngine();
         break;
     case GLES_VERSION_1_1:
         engine = new GLES11RenderEngine();
         break;
     case GLES_VERSION_2_0:
     case GLES_VERSION_3_0:
         engine = new GLES20RenderEngine();
         break;
     }
     engine->setEGLHandles(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.getExtension());
     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;
 }

 RenderEngine::RenderEngine() : mEGLConfig(NULL), mEGLContext(EGL_NO_CONTEXT) {
 }

 RenderEngine::~RenderEngine() {
 }

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

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

 EGLContext RenderEngine::getEGLContext() const {
     return mEGLContext;
 }

 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::flush() {
     glFlush();
 }

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

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

 RenderEngine::BindImageAsFramebuffer::BindImageAsFramebuffer(
         RenderEngine& engine, EGLImageKHR image) : mEngine(engine)
 {
     mEngine.bindImageAsFramebuffer(image, &mTexName, &mFbName, &mStatus);

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

 RenderEngine::BindImageAsFramebuffer::~BindImageAsFramebuffer() {
     // back to main framebuffer
     mEngine.unbindFramebuffer(mTexName, mFbName);
 }

 status_t RenderEngine::BindImageAsFramebuffer::getStatus() const {
     return mStatus == GL_FRAMEBUFFER_COMPLETE_OES ? NO_ERROR : BAD_VALUE;
 }

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

 static status_t selectConfigForAttribute(EGLDisplay dpy, EGLint const* attrs,
         EGLint attribute, EGLint wanted, EGLConfig* outConfig) {
     EGLint numConfigs = -1, n = 0;
     eglGetConfigs(dpy, NULL, 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) {};
         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, value);
             }
         }
         operator EGLint () const { return v.mList[attribute]; }
     };
 public:
     EGLAttributeVector() {
         mList.add(EGL_NONE, EGL_NONE);
     }
     void remove(EGLint attribute) {
         if (attribute != EGL_NONE) {
             mList.removeItem(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;
         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) {
     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");
             }
         }
     }

     // 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;
 }

 // ---------------------------------------------------------------------------
 }; // 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 <cutils/log.h>
	#include <ui/Rect.h>
	#include <ui/Region.h>

	#include "RenderEngine.h"
	#include "GLES10RenderEngine.h"
	#include "GLES11RenderEngine.h"
	#include "GLES20RenderEngine.h"
	#include "GLExtensions.h"
	#include "Mesh.h"

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

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

	static bool findExtension(const char* exts, const char* name) {
	if (!exts)
	return false;
	size_t len = strlen(name);

	const char* pos = exts;
	while ((pos = strstr(pos, name)) != NULL) {
	if (pos[len] == '\0' \|\| pos[len] == ' ')
	return true;
	pos += len;
	}

	return false;
	}

	RenderEngine* RenderEngine::create(EGLDisplay display, int hwcFormat) {
	// EGL_ANDROIDX_no_config_context is an experimental extension with no
	// written specification. It will be replaced by something more formal.
	// SurfaceFlinger is using it to allow a single EGLContext to render to
	// both a 16-bit primary display framebuffer and a 32-bit virtual display
	// framebuffer.
	//
	// The code assumes that ES2 or later is available if this extension is
	// supported.
	EGLConfig config = EGL_NO_CONFIG;
	if (!findExtension(
	eglQueryStringImplementationANDROID(display, EGL_EXTENSIONS),
	"EGL_ANDROIDX_no_config_context")) {
	config = chooseEglConfig(display, hwcFormat);
	}

	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");
	}

	// Also create our EGLContext
	EGLint contextAttributes[] = {
	EGL_CONTEXT_CLIENT_VERSION, contextClientVersion, // MUST be first
	#ifdef EGL_IMG_context_priority
	#ifdef HAS_CONTEXT_PRIORITY
	#warning "using EGL_IMG_context_priority"
	EGL_CONTEXT_PRIORITY_LEVEL_IMG, EGL_CONTEXT_PRIORITY_HIGH_IMG,
	#endif
	#endif
	EGL_NONE, EGL_NONE
	};
	EGLContext ctxt = eglCreateContext(display, config, NULL, contextAttributes);

	// 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);
	}
	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");

	GLExtensions& extensions(GLExtensions::getInstance());
	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

	RenderEngine* engine = NULL;
	switch (version) {
	case GLES_VERSION_1_0:
	engine = new GLES10RenderEngine();
	break;
	case GLES_VERSION_1_1:
	engine = new GLES11RenderEngine();
	break;
	case GLES_VERSION_2_0:
	case GLES_VERSION_3_0:
	engine = new GLES20RenderEngine();
	break;
	}
	engine->setEGLHandles(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.getExtension());
	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;
	}

	RenderEngine::RenderEngine() : mEGLConfig(NULL), mEGLContext(EGL_NO_CONTEXT) {
	}

	RenderEngine::~RenderEngine() {
	}

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

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

	EGLContext RenderEngine::getEGLContext() const {
	return mEGLContext;
	}

	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::flush() {
	glFlush();
	}

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

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

	RenderEngine::BindImageAsFramebuffer::BindImageAsFramebuffer(
	RenderEngine& engine, EGLImageKHR image) : mEngine(engine)
	{
	mEngine.bindImageAsFramebuffer(image, &mTexName, &mFbName, &mStatus);

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

	RenderEngine::BindImageAsFramebuffer::~BindImageAsFramebuffer() {
	// back to main framebuffer
	mEngine.unbindFramebuffer(mTexName, mFbName);
	}

	status_t RenderEngine::BindImageAsFramebuffer::getStatus() const {
	return mStatus == GL_FRAMEBUFFER_COMPLETE_OES ? NO_ERROR : BAD_VALUE;
	}

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

	static status_t selectConfigForAttribute(EGLDisplay dpy, EGLint const* attrs,
	EGLint attribute, EGLint wanted, EGLConfig* outConfig) {
	EGLint numConfigs = -1, n = 0;
	eglGetConfigs(dpy, NULL, 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) {};
	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, value);
	}
	}
	operator EGLint () const { return v.mList[attribute]; }
	};
	public:
	EGLAttributeVector() {
	mList.add(EGL_NONE, EGL_NONE);
	}
	void remove(EGLint attribute) {
	if (attribute != EGL_NONE) {
	mList.removeItem(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;
	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) {
	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");
	}
	}
	}

	// 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;
	}

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