src/OpenGL/libEGL/Config.cpp - SwiftShader - Git at Google

 // Copyright 2016 The SwiftShader Authors. All Rights Reserved.
 //
 // 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.

 // Config.cpp: Implements the egl::Config class, describing the format, type
 // and size for an egl::Surface. Implements EGLConfig and related functionality.
 // [EGL 1.4] section 3.4 page 15.

 #include "Config.h"

 #include "common/debug.h"

 #include <EGL/eglext.h>
 #if defined(__ANDROID__) && !defined(ANDROID_NDK_BUILD)
 #include <system/graphics.h>
 #endif

 #include <string.h>
 #include <algorithm>
 #include <cstring>
 #include <vector>
 #include <map>

 using namespace std;

 namespace egl
 {

 Config::Config(sw::Format displayFormat, EGLint minInterval, EGLint maxInterval, sw::Format renderTargetFormat, sw::Format depthStencilFormat, EGLint multiSample)
 	: mRenderTargetFormat(renderTargetFormat), mDepthStencilFormat(depthStencilFormat), mMultiSample(multiSample)
 {
 	mBindToTextureRGB = EGL_FALSE;
 	mBindToTextureRGBA = EGL_FALSE;

 	// Initialize to a high value to lower the preference of formats for which there's no native support
 	mNativeVisualID = 0x7FFFFFFF;

 	switch(renderTargetFormat)
 	{
 	case sw::FORMAT_A1R5G5B5:
 		mRedSize = 5;
 		mGreenSize = 5;
 		mBlueSize = 5;
 		mAlphaSize = 1;
 		break;
 	case sw::FORMAT_A2R10G10B10:
 		mRedSize = 10;
 		mGreenSize = 10;
 		mBlueSize = 10;
 		mAlphaSize = 2;
 		break;
 	case sw::FORMAT_A8R8G8B8:
 		mRedSize = 8;
 		mGreenSize = 8;
 		mBlueSize = 8;
 		mAlphaSize = 8;
 		mBindToTextureRGBA = EGL_TRUE;
 		#if defined(__ANDROID__) && !defined(ANDROID_NDK_BUILD)
 			mNativeVisualID = HAL_PIXEL_FORMAT_BGRA_8888;
 		#else
 			mNativeVisualID = 2;   // Arbitrary; prefer over ABGR
 		#endif
 		break;
 	case sw::FORMAT_A8B8G8R8:
 		mRedSize = 8;
 		mGreenSize = 8;
 		mBlueSize = 8;
 		mAlphaSize = 8;
 		mBindToTextureRGBA = EGL_TRUE;
 		#if defined(__ANDROID__) && !defined(ANDROID_NDK_BUILD)
 			mNativeVisualID = HAL_PIXEL_FORMAT_RGBA_8888;
 		#endif
 		break;
 	case sw::FORMAT_R5G6B5:
 		mRedSize = 5;
 		mGreenSize = 6;
 		mBlueSize = 5;
 		mAlphaSize = 0;
 		#if defined(__ANDROID__) && !defined(ANDROID_NDK_BUILD)
 			mNativeVisualID = HAL_PIXEL_FORMAT_RGB_565;
 		#endif
 		break;
 	case sw::FORMAT_X8R8G8B8:
 		mRedSize = 8;
 		mGreenSize = 8;
 		mBlueSize = 8;
 		mAlphaSize = 0;
 		mBindToTextureRGB = EGL_TRUE;
 		#if defined(__ANDROID__) && !defined(ANDROID_NDK_BUILD)
 			mNativeVisualID = 0x1FF;   // HAL_PIXEL_FORMAT_BGRX_8888
 		#else
 			mNativeVisualID = 1;   // Arbitrary; prefer over XBGR
 		#endif
 		break;
 	case sw::FORMAT_X8B8G8R8:
 		mRedSize = 8;
 		mGreenSize = 8;
 		mBlueSize = 8;
 		mAlphaSize = 0;
 		mBindToTextureRGB = EGL_TRUE;
 		#if defined(__ANDROID__) && !defined(ANDROID_NDK_BUILD)
 			mNativeVisualID = HAL_PIXEL_FORMAT_RGBX_8888;
 		#endif
 		break;
 	default:
 		UNREACHABLE(renderTargetFormat);
 	}

 	mLuminanceSize = 0;
 	mBufferSize = mRedSize + mGreenSize + mBlueSize + mLuminanceSize + mAlphaSize;
 	mAlphaMaskSize = 0;
 	mColorBufferType = EGL_RGB_BUFFER;
 	mConfigCaveat = EGL_NONE;
 	mConfigID = 0;
 	mConformant = EGL_OPENGL_ES_BIT | EGL_OPENGL_ES2_BIT | EGL_OPENGL_ES3_BIT;

 	switch(depthStencilFormat)
 	{
 	case sw::FORMAT_NULL:
 		mDepthSize = 0;
 		mStencilSize = 0;
 		break;
 //	case sw::FORMAT_D16_LOCKABLE:
 //		mDepthSize = 16;
 //		mStencilSize = 0;
 //		break;
 	case sw::FORMAT_D32:
 		mDepthSize = 32;
 		mStencilSize = 0;
 		break;
 //	case sw::FORMAT_D15S1:
 //		mDepthSize = 15;
 //		mStencilSize = 1;
 //		break;
 	case sw::FORMAT_D24S8:
 		mDepthSize = 24;
 		mStencilSize = 8;
 		break;
 	case sw::FORMAT_D24X8:
 		mDepthSize = 24;
 		mStencilSize = 0;
 		break;
 //	case sw::FORMAT_D24X4S4:
 //		mDepthSize = 24;
 //		mStencilSize = 4;
 //		break;
 	case sw::FORMAT_D16:
 		mDepthSize = 16;
 		mStencilSize = 0;
 		break;
 //	case sw::FORMAT_D32F_LOCKABLE:
 //		mDepthSize = 32;
 //		mStencilSize = 0;
 //		break;
 //	case sw::FORMAT_D24FS8:
 //		mDepthSize = 24;
 //		mStencilSize = 8;
 //		break;
 	default:
 		UNREACHABLE(depthStencilFormat);
 	}

 	mLevel = 0;
 	mMatchNativePixmap = EGL_NONE;
 	mMaxPBufferWidth = 4096;
 	mMaxPBufferHeight = 4096;
 	mMaxPBufferPixels = mMaxPBufferWidth * mMaxPBufferHeight;
 	mMaxSwapInterval = maxInterval;
 	mMinSwapInterval = minInterval;
 	mNativeRenderable = EGL_FALSE;
 	mNativeVisualType = 0;
 	mRenderableType = EGL_OPENGL_ES_BIT | EGL_OPENGL_ES2_BIT | EGL_OPENGL_ES3_BIT;
 	mSampleBuffers = (multiSample > 0) ? 1 : 0;
 	mSamples = multiSample;
 	mSurfaceType = EGL_PBUFFER_BIT | EGL_WINDOW_BIT | EGL_SWAP_BEHAVIOR_PRESERVED_BIT | EGL_MULTISAMPLE_RESOLVE_BOX_BIT;
 	mTransparentType = EGL_NONE;
 	mTransparentRedValue = 0;
 	mTransparentGreenValue = 0;
 	mTransparentBlueValue = 0;

 	// Although we could support any format as an Android HWComposer compatible config by converting when necessary,
 	// the intent of EGL_ANDROID_framebuffer_target is to prevent any copies or conversions.
 	mFramebufferTargetAndroid = (displayFormat == renderTargetFormat) ? EGL_TRUE : EGL_FALSE;
 	mRecordableAndroid = EGL_TRUE;
 }

 EGLConfig Config::getHandle() const
 {
 	return (EGLConfig)(size_t)mConfigID;
 }

 // This ordering determines the config ID
 bool CompareConfig::operator()(const Config &x, const Config &y) const
 {
 	#define SORT_SMALLER(attribute)                \
 		if(x.attribute != y.attribute)             \
 		{                                          \
 			return x.attribute < y.attribute;      \
 		}

 	static_assert(EGL_NONE < EGL_SLOW_CONFIG && EGL_SLOW_CONFIG < EGL_NON_CONFORMANT_CONFIG, "");
 	SORT_SMALLER(mConfigCaveat);

 	static_assert(EGL_RGB_BUFFER < EGL_LUMINANCE_BUFFER, "");
 	SORT_SMALLER(mColorBufferType);

 	SORT_SMALLER(mRedSize);
 	SORT_SMALLER(mGreenSize);
 	SORT_SMALLER(mBlueSize);
 	SORT_SMALLER(mAlphaSize);

 	SORT_SMALLER(mBufferSize);
 	SORT_SMALLER(mSampleBuffers);
 	SORT_SMALLER(mSamples);
 	SORT_SMALLER(mDepthSize);
 	SORT_SMALLER(mStencilSize);
 	SORT_SMALLER(mAlphaMaskSize);
 	SORT_SMALLER(mNativeVisualType);
 	SORT_SMALLER(mNativeVisualID);

 	#undef SORT_SMALLER

 	// Strict ordering requires sorting all non-equal fields above
 	assert(memcmp(&x, &y, sizeof(Config)) == 0);

 	return false;
 }

 // Function object used by STL sorting routines for ordering Configs according to [EGL] section 3.4.1 page 24.
 class SortConfig
 {
 public:
 	explicit SortConfig(const EGLint *attribList);

 	bool operator()(const Config *x, const Config *y) const;

 private:
 	EGLint wantedComponentsSize(const Config *config) const;

 	bool mWantRed;
 	bool mWantGreen;
 	bool mWantBlue;
 	bool mWantAlpha;
 	bool mWantLuminance;
 };

 SortConfig::SortConfig(const EGLint *attribList)
 	: mWantRed(false), mWantGreen(false), mWantBlue(false), mWantAlpha(false), mWantLuminance(false)
 {
 	// [EGL] section 3.4.1 page 24
 	// Sorting rule #3: by larger total number of color bits,
 	// not considering components that are 0 or don't-care.
 	for(const EGLint *attr = attribList; attr[0] != EGL_NONE; attr += 2)
 	{
 		// When multiple instances of the same attribute are present, last wins.
 		bool isSpecified = attr[1] && attr[1] != EGL_DONT_CARE;
 		switch(attr[0])
 		{
 			case EGL_RED_SIZE:       mWantRed = isSpecified;       break;
 			case EGL_GREEN_SIZE:     mWantGreen = isSpecified;     break;
 			case EGL_BLUE_SIZE:      mWantBlue = isSpecified;      break;
 			case EGL_ALPHA_SIZE:     mWantAlpha = isSpecified;     break;
 			case EGL_LUMINANCE_SIZE: mWantLuminance = isSpecified; break;
 		}
 	}
 }

 EGLint SortConfig::wantedComponentsSize(const Config *config) const
 {
 	EGLint total = 0;

 	if(mWantRed)       total += config->mRedSize;
 	if(mWantGreen)     total += config->mGreenSize;
 	if(mWantBlue)      total += config->mBlueSize;
 	if(mWantAlpha)     total += config->mAlphaSize;
 	if(mWantLuminance) total += config->mLuminanceSize;

 	return total;
 }

 bool SortConfig::operator()(const Config *x, const Config *y) const
 {
 	#define SORT_SMALLER(attribute)                \
 		if(x->attribute != y->attribute)           \
 		{                                          \
 			return x->attribute < y->attribute;    \
 		}

 	static_assert(EGL_NONE < EGL_SLOW_CONFIG && EGL_SLOW_CONFIG < EGL_NON_CONFORMANT_CONFIG, "");
 	SORT_SMALLER(mConfigCaveat);

 	static_assert(EGL_RGB_BUFFER < EGL_LUMINANCE_BUFFER, "");
 	SORT_SMALLER(mColorBufferType);

 	// By larger total number of color bits, only considering those that are requested to be > 0.
 	EGLint xComponentsSize = wantedComponentsSize(x);
 	EGLint yComponentsSize = wantedComponentsSize(y);
 	if(xComponentsSize != yComponentsSize)
 	{
 		return xComponentsSize > yComponentsSize;
 	}

 	SORT_SMALLER(mBufferSize);
 	SORT_SMALLER(mSampleBuffers);
 	SORT_SMALLER(mSamples);
 	SORT_SMALLER(mDepthSize);
 	SORT_SMALLER(mStencilSize);
 	SORT_SMALLER(mAlphaMaskSize);
 	SORT_SMALLER(mNativeVisualType);
 	SORT_SMALLER(mConfigID);

 	#undef SORT_SMALLER

 	return false;
 }

 ConfigSet::ConfigSet()
 {
 }

 void ConfigSet::add(sw::Format displayFormat, EGLint minSwapInterval, EGLint maxSwapInterval, sw::Format renderTargetFormat, sw::Format depthStencilFormat, EGLint multiSample)
 {
 	Config conformantConfig(displayFormat, minSwapInterval, maxSwapInterval, renderTargetFormat, depthStencilFormat, multiSample);
 	mSet.insert(conformantConfig);
 }

 size_t ConfigSet::size() const
 {
 	return mSet.size();
 }

 bool ConfigSet::getConfigs(EGLConfig *configs, const EGLint *attribList, EGLint configSize, EGLint *numConfig)
 {
 	vector<const Config*> passed;
 	passed.reserve(mSet.size());

 	/* Conformance expects for multiple instances of the same attribute that the
 	 * last instance `wins`. Reduce the attribute list first to comply with
 	 * this.
 	 */
 	/* TODO: C++11: unordered_map would be fine here */
 	map<EGLint, EGLint> attribs;
 	const EGLint *attribute = attribList;
 	while (attribute[0] != EGL_NONE)
 	{
 		attribs[attribute[0]] = attribute[1];
 		attribute += 2;
 	}

 	for(Iterator config = mSet.begin(); config != mSet.end(); config++)
 	{
 		bool match = true;
 		bool caveatMatch = (config->mConfigCaveat == EGL_NONE);
 		for (map<EGLint, EGLint>::iterator attribIt = attribs.begin(); attribIt != attribs.end(); attribIt++)
 		{
 			if(attribIt->second != EGL_DONT_CARE)
 			{
 				switch(attribIt->first)
 				{
 				case EGL_BUFFER_SIZE:                match = config->mBufferSize >= attribIt->second;                           break;
 				case EGL_ALPHA_SIZE:                 match = config->mAlphaSize >= attribIt->second;                            break;
 				case EGL_BLUE_SIZE:                  match = config->mBlueSize >= attribIt->second;                             break;
 				case EGL_GREEN_SIZE:                 match = config->mGreenSize >= attribIt->second;                            break;
 				case EGL_RED_SIZE:                   match = config->mRedSize >= attribIt->second;                              break;
 				case EGL_DEPTH_SIZE:                 match = config->mDepthSize >= attribIt->second;                            break;
 				case EGL_STENCIL_SIZE:               match = config->mStencilSize >= attribIt->second;                          break;
 				case EGL_CONFIG_CAVEAT:              match = config->mConfigCaveat == (EGLenum)attribIt->second;                break;
 				case EGL_CONFIG_ID:                  match = config->mConfigID == attribIt->second;                             break;
 				case EGL_LEVEL:                      match = config->mLevel >= attribIt->second;                                break;
 				case EGL_NATIVE_RENDERABLE:          match = config->mNativeRenderable == (EGLBoolean)attribIt->second;         break;
 				case EGL_NATIVE_VISUAL_TYPE:         match = config->mNativeVisualType == attribIt->second;                     break;
 				case EGL_SAMPLES:                    match = config->mSamples >= attribIt->second;                              break;
 				case EGL_SAMPLE_BUFFERS:             match = config->mSampleBuffers >= attribIt->second;                        break;
 				case EGL_SURFACE_TYPE:               match = (config->mSurfaceType & attribIt->second) == attribIt->second;     break;
 				case EGL_TRANSPARENT_TYPE:           match = config->mTransparentType == (EGLenum)attribIt->second;             break;
 				case EGL_TRANSPARENT_BLUE_VALUE:     match = config->mTransparentBlueValue == attribIt->second;                 break;
 				case EGL_TRANSPARENT_GREEN_VALUE:    match = config->mTransparentGreenValue == attribIt->second;                break;
 				case EGL_TRANSPARENT_RED_VALUE:      match = config->mTransparentRedValue == attribIt->second;                  break;
 				case EGL_BIND_TO_TEXTURE_RGB:        match = config->mBindToTextureRGB == (EGLBoolean)attribIt->second;         break;
 				case EGL_BIND_TO_TEXTURE_RGBA:       match = config->mBindToTextureRGBA == (EGLBoolean)attribIt->second;        break;
 				case EGL_MIN_SWAP_INTERVAL:          match = config->mMinSwapInterval == attribIt->second;                      break;
 				case EGL_MAX_SWAP_INTERVAL:          match = config->mMaxSwapInterval == attribIt->second;                      break;
 				case EGL_LUMINANCE_SIZE:             match = config->mLuminanceSize >= attribIt->second;                        break;
 				case EGL_ALPHA_MASK_SIZE:            match = config->mAlphaMaskSize >= attribIt->second;                        break;
 				case EGL_COLOR_BUFFER_TYPE:          match = config->mColorBufferType == (EGLenum)attribIt->second;             break;
 				case EGL_RENDERABLE_TYPE:            match = (config->mRenderableType & attribIt->second) == attribIt->second;  break;
 				case EGL_MATCH_NATIVE_PIXMAP:        match = false; UNIMPLEMENTED();                                            break;
 				case EGL_CONFORMANT:                 match = (config->mConformant & attribIt->second) == attribIt->second;      break;
 				case EGL_RECORDABLE_ANDROID:         match = config->mRecordableAndroid == (EGLBoolean)attribIt->second;        break;
 				case EGL_FRAMEBUFFER_TARGET_ANDROID: match = config->mFramebufferTargetAndroid == (EGLBoolean)attribIt->second; break;

 				// Ignored attributes
 				case EGL_MAX_PBUFFER_WIDTH:
 				case EGL_MAX_PBUFFER_HEIGHT:
 				case EGL_MAX_PBUFFER_PIXELS:
 				case EGL_NATIVE_VISUAL_ID:
 					break;

 				default:
 					*numConfig = 0;
 					return false;
 				}

 				if(!match)
 				{
 					break;
 				}
 			}

 			if(attribIt->first == EGL_CONFIG_CAVEAT)
 			{
 				caveatMatch = match;
 			}
 		}

 		if(match && caveatMatch)   // We require the caveats to be NONE or the requested flags
 		{
 			passed.push_back(&*config);
 		}
 	}

 	if(configs)
 	{
 		sort(passed.begin(), passed.end(), SortConfig(attribList));

 		EGLint index;
 		for(index = 0; index < configSize && index < static_cast<EGLint>(passed.size()); index++)
 		{
 			configs[index] = passed[index]->getHandle();
 		}

 		*numConfig = index;
 	}
 	else
 	{
 		*numConfig = static_cast<EGLint>(passed.size());
 	}

 	return true;
 }

 const egl::Config *ConfigSet::get(EGLConfig configHandle)
 {
 	for(Iterator config = mSet.begin(); config != mSet.end(); config++)
 	{
 		if(config->getHandle() == configHandle)
 		{
 			return &(*config);
 		}
 	}

 	return nullptr;
 }
 }
	// Copyright 2016 The SwiftShader Authors. All Rights Reserved.
	//
	// 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.

	// Config.cpp: Implements the egl::Config class, describing the format, type
	// and size for an egl::Surface. Implements EGLConfig and related functionality.
	// [EGL 1.4] section 3.4 page 15.

	#include "Config.h"

	#include "common/debug.h"

	#include <EGL/eglext.h>
	#if defined(__ANDROID__) && !defined(ANDROID_NDK_BUILD)
	#include <system/graphics.h>
	#endif

	#include <string.h>
	#include <algorithm>
	#include <cstring>
	#include <vector>
	#include <map>

	using namespace std;

	namespace egl
	{

	Config::Config(sw::Format displayFormat, EGLint minInterval, EGLint maxInterval, sw::Format renderTargetFormat, sw::Format depthStencilFormat, EGLint multiSample)
	: mRenderTargetFormat(renderTargetFormat), mDepthStencilFormat(depthStencilFormat), mMultiSample(multiSample)
	{
	mBindToTextureRGB = EGL_FALSE;
	mBindToTextureRGBA = EGL_FALSE;

	// Initialize to a high value to lower the preference of formats for which there's no native support
	mNativeVisualID = 0x7FFFFFFF;

	switch(renderTargetFormat)
	{
	case sw::FORMAT_A1R5G5B5:
	mRedSize = 5;
	mGreenSize = 5;
	mBlueSize = 5;
	mAlphaSize = 1;
	break;
	case sw::FORMAT_A2R10G10B10:
	mRedSize = 10;
	mGreenSize = 10;
	mBlueSize = 10;
	mAlphaSize = 2;
	break;
	case sw::FORMAT_A8R8G8B8:
	mRedSize = 8;
	mGreenSize = 8;
	mBlueSize = 8;
	mAlphaSize = 8;
	mBindToTextureRGBA = EGL_TRUE;
	#if defined(__ANDROID__) && !defined(ANDROID_NDK_BUILD)
	mNativeVisualID = HAL_PIXEL_FORMAT_BGRA_8888;
	#else
	mNativeVisualID = 2; // Arbitrary; prefer over ABGR
	#endif
	break;
	case sw::FORMAT_A8B8G8R8:
	mRedSize = 8;
	mGreenSize = 8;
	mBlueSize = 8;
	mAlphaSize = 8;
	mBindToTextureRGBA = EGL_TRUE;
	#if defined(__ANDROID__) && !defined(ANDROID_NDK_BUILD)
	mNativeVisualID = HAL_PIXEL_FORMAT_RGBA_8888;
	#endif
	break;
	case sw::FORMAT_R5G6B5:
	mRedSize = 5;
	mGreenSize = 6;
	mBlueSize = 5;
	mAlphaSize = 0;
	#if defined(__ANDROID__) && !defined(ANDROID_NDK_BUILD)
	mNativeVisualID = HAL_PIXEL_FORMAT_RGB_565;
	#endif
	break;
	case sw::FORMAT_X8R8G8B8:
	mRedSize = 8;
	mGreenSize = 8;
	mBlueSize = 8;
	mAlphaSize = 0;
	mBindToTextureRGB = EGL_TRUE;
	#if defined(__ANDROID__) && !defined(ANDROID_NDK_BUILD)
	mNativeVisualID = 0x1FF; // HAL_PIXEL_FORMAT_BGRX_8888
	#else
	mNativeVisualID = 1; // Arbitrary; prefer over XBGR
	#endif
	break;
	case sw::FORMAT_X8B8G8R8:
	mRedSize = 8;
	mGreenSize = 8;
	mBlueSize = 8;
	mAlphaSize = 0;
	mBindToTextureRGB = EGL_TRUE;
	#if defined(__ANDROID__) && !defined(ANDROID_NDK_BUILD)
	mNativeVisualID = HAL_PIXEL_FORMAT_RGBX_8888;
	#endif
	break;
	default:
	UNREACHABLE(renderTargetFormat);
	}

	mLuminanceSize = 0;
	mBufferSize = mRedSize + mGreenSize + mBlueSize + mLuminanceSize + mAlphaSize;
	mAlphaMaskSize = 0;
	mColorBufferType = EGL_RGB_BUFFER;
	mConfigCaveat = EGL_NONE;
	mConfigID = 0;
	mConformant = EGL_OPENGL_ES_BIT \| EGL_OPENGL_ES2_BIT \| EGL_OPENGL_ES3_BIT;

	switch(depthStencilFormat)
	{
	case sw::FORMAT_NULL:
	mDepthSize = 0;
	mStencilSize = 0;
	break;
	// case sw::FORMAT_D16_LOCKABLE:
	// mDepthSize = 16;
	// mStencilSize = 0;
	// break;
	case sw::FORMAT_D32:
	mDepthSize = 32;
	mStencilSize = 0;
	break;
	// case sw::FORMAT_D15S1:
	// mDepthSize = 15;
	// mStencilSize = 1;
	// break;
	case sw::FORMAT_D24S8:
	mDepthSize = 24;
	mStencilSize = 8;
	break;
	case sw::FORMAT_D24X8:
	mDepthSize = 24;
	mStencilSize = 0;
	break;
	// case sw::FORMAT_D24X4S4:
	// mDepthSize = 24;
	// mStencilSize = 4;
	// break;
	case sw::FORMAT_D16:
	mDepthSize = 16;
	mStencilSize = 0;
	break;
	// case sw::FORMAT_D32F_LOCKABLE:
	// mDepthSize = 32;
	// mStencilSize = 0;
	// break;
	// case sw::FORMAT_D24FS8:
	// mDepthSize = 24;
	// mStencilSize = 8;
	// break;
	default:
	UNREACHABLE(depthStencilFormat);
	}

	mLevel = 0;
	mMatchNativePixmap = EGL_NONE;
	mMaxPBufferWidth = 4096;
	mMaxPBufferHeight = 4096;
	mMaxPBufferPixels = mMaxPBufferWidth * mMaxPBufferHeight;
	mMaxSwapInterval = maxInterval;
	mMinSwapInterval = minInterval;
	mNativeRenderable = EGL_FALSE;
	mNativeVisualType = 0;
	mRenderableType = EGL_OPENGL_ES_BIT \| EGL_OPENGL_ES2_BIT \| EGL_OPENGL_ES3_BIT;
	mSampleBuffers = (multiSample > 0) ? 1 : 0;
	mSamples = multiSample;
	mSurfaceType = EGL_PBUFFER_BIT \| EGL_WINDOW_BIT \| EGL_SWAP_BEHAVIOR_PRESERVED_BIT \| EGL_MULTISAMPLE_RESOLVE_BOX_BIT;
	mTransparentType = EGL_NONE;
	mTransparentRedValue = 0;
	mTransparentGreenValue = 0;
	mTransparentBlueValue = 0;

	// Although we could support any format as an Android HWComposer compatible config by converting when necessary,
	// the intent of EGL_ANDROID_framebuffer_target is to prevent any copies or conversions.
	mFramebufferTargetAndroid = (displayFormat == renderTargetFormat) ? EGL_TRUE : EGL_FALSE;
	mRecordableAndroid = EGL_TRUE;
	}

	EGLConfig Config::getHandle() const
	{
	return (EGLConfig)(size_t)mConfigID;
	}

	// This ordering determines the config ID
	bool CompareConfig::operator()(const Config &x, const Config &y) const
	{
	#define SORT_SMALLER(attribute) \
	if(x.attribute != y.attribute) \
	{ \
	return x.attribute < y.attribute; \
	}

	static_assert(EGL_NONE < EGL_SLOW_CONFIG && EGL_SLOW_CONFIG < EGL_NON_CONFORMANT_CONFIG, "");
	SORT_SMALLER(mConfigCaveat);

	static_assert(EGL_RGB_BUFFER < EGL_LUMINANCE_BUFFER, "");
	SORT_SMALLER(mColorBufferType);

	SORT_SMALLER(mRedSize);
	SORT_SMALLER(mGreenSize);
	SORT_SMALLER(mBlueSize);
	SORT_SMALLER(mAlphaSize);

	SORT_SMALLER(mBufferSize);
	SORT_SMALLER(mSampleBuffers);
	SORT_SMALLER(mSamples);
	SORT_SMALLER(mDepthSize);
	SORT_SMALLER(mStencilSize);
	SORT_SMALLER(mAlphaMaskSize);
	SORT_SMALLER(mNativeVisualType);
	SORT_SMALLER(mNativeVisualID);

	#undef SORT_SMALLER

	// Strict ordering requires sorting all non-equal fields above
	assert(memcmp(&x, &y, sizeof(Config)) == 0);

	return false;
	}

	// Function object used by STL sorting routines for ordering Configs according to [EGL] section 3.4.1 page 24.
	class SortConfig
	{
	public:
	explicit SortConfig(const EGLint *attribList);

	bool operator()(const Config x, const Config y) const;

	private:
	EGLint wantedComponentsSize(const Config *config) const;

	bool mWantRed;
	bool mWantGreen;
	bool mWantBlue;
	bool mWantAlpha;
	bool mWantLuminance;
	};

	SortConfig::SortConfig(const EGLint *attribList)
	: mWantRed(false), mWantGreen(false), mWantBlue(false), mWantAlpha(false), mWantLuminance(false)
	{
	// [EGL] section 3.4.1 page 24
	// Sorting rule #3: by larger total number of color bits,
	// not considering components that are 0 or don't-care.
	for(const EGLint *attr = attribList; attr[0] != EGL_NONE; attr += 2)
	{
	// When multiple instances of the same attribute are present, last wins.
	bool isSpecified = attr[1] && attr[1] != EGL_DONT_CARE;
	switch(attr[0])
	{
	case EGL_RED_SIZE: mWantRed = isSpecified; break;
	case EGL_GREEN_SIZE: mWantGreen = isSpecified; break;
	case EGL_BLUE_SIZE: mWantBlue = isSpecified; break;
	case EGL_ALPHA_SIZE: mWantAlpha = isSpecified; break;
	case EGL_LUMINANCE_SIZE: mWantLuminance = isSpecified; break;
	}
	}
	}

	EGLint SortConfig::wantedComponentsSize(const Config *config) const
	{
	EGLint total = 0;

	if(mWantRed) total += config->mRedSize;
	if(mWantGreen) total += config->mGreenSize;
	if(mWantBlue) total += config->mBlueSize;
	if(mWantAlpha) total += config->mAlphaSize;
	if(mWantLuminance) total += config->mLuminanceSize;

	return total;
	}

	bool SortConfig::operator()(const Config x, const Config y) const
	{
	#define SORT_SMALLER(attribute) \
	if(x->attribute != y->attribute) \
	{ \
	return x->attribute < y->attribute; \
	}

	static_assert(EGL_NONE < EGL_SLOW_CONFIG && EGL_SLOW_CONFIG < EGL_NON_CONFORMANT_CONFIG, "");
	SORT_SMALLER(mConfigCaveat);

	static_assert(EGL_RGB_BUFFER < EGL_LUMINANCE_BUFFER, "");
	SORT_SMALLER(mColorBufferType);

	// By larger total number of color bits, only considering those that are requested to be > 0.
	EGLint xComponentsSize = wantedComponentsSize(x);
	EGLint yComponentsSize = wantedComponentsSize(y);
	if(xComponentsSize != yComponentsSize)
	{
	return xComponentsSize > yComponentsSize;
	}

	SORT_SMALLER(mBufferSize);
	SORT_SMALLER(mSampleBuffers);
	SORT_SMALLER(mSamples);
	SORT_SMALLER(mDepthSize);
	SORT_SMALLER(mStencilSize);
	SORT_SMALLER(mAlphaMaskSize);
	SORT_SMALLER(mNativeVisualType);
	SORT_SMALLER(mConfigID);

	#undef SORT_SMALLER

	return false;
	}

	ConfigSet::ConfigSet()
	{
	}

	void ConfigSet::add(sw::Format displayFormat, EGLint minSwapInterval, EGLint maxSwapInterval, sw::Format renderTargetFormat, sw::Format depthStencilFormat, EGLint multiSample)
	{
	Config conformantConfig(displayFormat, minSwapInterval, maxSwapInterval, renderTargetFormat, depthStencilFormat, multiSample);
	mSet.insert(conformantConfig);
	}

	size_t ConfigSet::size() const
	{
	return mSet.size();
	}

	bool ConfigSet::getConfigs(EGLConfig configs, const EGLint attribList, EGLint configSize, EGLint *numConfig)
	{
	vector<const Config*> passed;
	passed.reserve(mSet.size());

	/* Conformance expects for multiple instances of the same attribute that the
	* last instance `wins`. Reduce the attribute list first to comply with
	* this.
	*/
	/* TODO: C++11: unordered_map would be fine here */
	map<EGLint, EGLint> attribs;
	const EGLint *attribute = attribList;
	while (attribute[0] != EGL_NONE)
	{
	attribs[attribute[0]] = attribute[1];
	attribute += 2;
	}

	for(Iterator config = mSet.begin(); config != mSet.end(); config++)
	{
	bool match = true;
	bool caveatMatch = (config->mConfigCaveat == EGL_NONE);
	for (map<EGLint, EGLint>::iterator attribIt = attribs.begin(); attribIt != attribs.end(); attribIt++)
	{
	if(attribIt->second != EGL_DONT_CARE)
	{
	switch(attribIt->first)
	{
	case EGL_BUFFER_SIZE: match = config->mBufferSize >= attribIt->second; break;
	case EGL_ALPHA_SIZE: match = config->mAlphaSize >= attribIt->second; break;
	case EGL_BLUE_SIZE: match = config->mBlueSize >= attribIt->second; break;
	case EGL_GREEN_SIZE: match = config->mGreenSize >= attribIt->second; break;
	case EGL_RED_SIZE: match = config->mRedSize >= attribIt->second; break;
	case EGL_DEPTH_SIZE: match = config->mDepthSize >= attribIt->second; break;
	case EGL_STENCIL_SIZE: match = config->mStencilSize >= attribIt->second; break;
	case EGL_CONFIG_CAVEAT: match = config->mConfigCaveat == (EGLenum)attribIt->second; break;
	case EGL_CONFIG_ID: match = config->mConfigID == attribIt->second; break;
	case EGL_LEVEL: match = config->mLevel >= attribIt->second; break;
	case EGL_NATIVE_RENDERABLE: match = config->mNativeRenderable == (EGLBoolean)attribIt->second; break;
	case EGL_NATIVE_VISUAL_TYPE: match = config->mNativeVisualType == attribIt->second; break;
	case EGL_SAMPLES: match = config->mSamples >= attribIt->second; break;
	case EGL_SAMPLE_BUFFERS: match = config->mSampleBuffers >= attribIt->second; break;
	case EGL_SURFACE_TYPE: match = (config->mSurfaceType & attribIt->second) == attribIt->second; break;
	case EGL_TRANSPARENT_TYPE: match = config->mTransparentType == (EGLenum)attribIt->second; break;
	case EGL_TRANSPARENT_BLUE_VALUE: match = config->mTransparentBlueValue == attribIt->second; break;
	case EGL_TRANSPARENT_GREEN_VALUE: match = config->mTransparentGreenValue == attribIt->second; break;
	case EGL_TRANSPARENT_RED_VALUE: match = config->mTransparentRedValue == attribIt->second; break;
	case EGL_BIND_TO_TEXTURE_RGB: match = config->mBindToTextureRGB == (EGLBoolean)attribIt->second; break;
	case EGL_BIND_TO_TEXTURE_RGBA: match = config->mBindToTextureRGBA == (EGLBoolean)attribIt->second; break;
	case EGL_MIN_SWAP_INTERVAL: match = config->mMinSwapInterval == attribIt->second; break;
	case EGL_MAX_SWAP_INTERVAL: match = config->mMaxSwapInterval == attribIt->second; break;
	case EGL_LUMINANCE_SIZE: match = config->mLuminanceSize >= attribIt->second; break;
	case EGL_ALPHA_MASK_SIZE: match = config->mAlphaMaskSize >= attribIt->second; break;
	case EGL_COLOR_BUFFER_TYPE: match = config->mColorBufferType == (EGLenum)attribIt->second; break;
	case EGL_RENDERABLE_TYPE: match = (config->mRenderableType & attribIt->second) == attribIt->second; break;
	case EGL_MATCH_NATIVE_PIXMAP: match = false; UNIMPLEMENTED(); break;
	case EGL_CONFORMANT: match = (config->mConformant & attribIt->second) == attribIt->second; break;
	case EGL_RECORDABLE_ANDROID: match = config->mRecordableAndroid == (EGLBoolean)attribIt->second; break;
	case EGL_FRAMEBUFFER_TARGET_ANDROID: match = config->mFramebufferTargetAndroid == (EGLBoolean)attribIt->second; break;

	// Ignored attributes
	case EGL_MAX_PBUFFER_WIDTH:
	case EGL_MAX_PBUFFER_HEIGHT:
	case EGL_MAX_PBUFFER_PIXELS:
	case EGL_NATIVE_VISUAL_ID:
	break;

	default:
	*numConfig = 0;
	return false;
	}

	if(!match)
	{
	break;
	}
	}

	if(attribIt->first == EGL_CONFIG_CAVEAT)
	{
	caveatMatch = match;
	}
	}

	if(match && caveatMatch) // We require the caveats to be NONE or the requested flags
	{
	passed.push_back(&*config);
	}
	}

	if(configs)
	{
	sort(passed.begin(), passed.end(), SortConfig(attribList));

	EGLint index;
	for(index = 0; index < configSize && index < static_cast<EGLint>(passed.size()); index++)
	{
	configs[index] = passed[index]->getHandle();
	}

	*numConfig = index;
	}
	else
	{
	*numConfig = static_cast<EGLint>(passed.size());
	}

	return true;
	}

	const egl::Config *ConfigSet::get(EGLConfig configHandle)
	{
	for(Iterator config = mSet.begin(); config != mSet.end(); config++)
	{
	if(config->getHandle() == configHandle)
	{
	return &(*config);
	}
	}

	return nullptr;
	}
	}