/*-------------------------------------------------------------------------
 * drawElements Quality Program EGL Module
 * ---------------------------------------
 *
 * Copyright 2014 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.
 *
 *//*!
 * \file
 * \brief Android-specific operations.
 *//*--------------------------------------------------------------------*/

#include "teglAndroidUtil.hpp"

#include "deStringUtil.hpp"
#include "tcuTextureUtil.hpp"
#include "gluTextureUtil.hpp"
#include "glwEnums.hpp"
#include "eglwLibrary.hpp"
#include "eglwEnums.hpp"

namespace deqp
{
namespace egl
{
namespace Image
{

using std::string;
using de::MovePtr;
using tcu::PixelBufferAccess;
using tcu::TextureFormat;
using tcu::Texture2D;
using eglu::AttribMap;
using namespace glw;
using namespace eglw;

#if (DE_OS != DE_OS_ANDROID)

MovePtr<ImageSource> createAndroidNativeImageSource	(GLenum format)
{
	return createUnsupportedImageSource("Not Android platform", format);
}

#else // DE_OS == DE_OS_ANDROID

namespace
{

#if defined(__ANDROID_API_O__) && (DE_ANDROID_API >= __ANDROID_API_O__)
#	include <sys/system_properties.h>
#	include <android/hardware_buffer.h>
#	include "deDynamicLibrary.hpp"
#	define BUILT_WITH_ANDROID_HARDWARE_BUFFER 1
#endif

#if defined(__ANDROID_API_P__) && (DE_ANDROID_API >= __ANDROID_API_P__)
#	define BUILT_WITH_ANDROID_P_HARDWARE_BUFFER 1
#endif

deInt32 androidGetSdkVersion (void)
{
	static deInt32 sdkVersion = -1;
	if (sdkVersion < 0)
	{
		char value[128] = {0};
		__system_property_get("ro.build.version.sdk", value);
		sdkVersion = static_cast<deInt32>(strtol(value, DE_NULL, 10));
		printf("SDK Version is %d\n", sdkVersion);
	}
	return sdkVersion;
}

typedef int		(*pfnAHardwareBuffer_allocate)(const AHardwareBuffer_Desc* desc, AHardwareBuffer** outBuffer);
typedef void	(*pfnAHardwareBuffer_describe)(const AHardwareBuffer* buffer, AHardwareBuffer_Desc* outDesc);
typedef void	(*pfnAHardwareBuffer_acquire)(AHardwareBuffer* buffer);
typedef void	(*pfnAHardwareBuffer_release)(AHardwareBuffer* buffer);
typedef int		(*pfnAHardwareBuffer_isSupported)(const AHardwareBuffer_Desc* desc);

struct AhbFunctions
{
	pfnAHardwareBuffer_allocate		allocate;
	pfnAHardwareBuffer_describe		describe;
	pfnAHardwareBuffer_acquire		acquire;
	pfnAHardwareBuffer_release		release;
	pfnAHardwareBuffer_isSupported	isSupported;
};

AhbFunctions ahbFunctions;

bool ahbFunctionsLoaded (AhbFunctions* pAhbFunctions)
{
	static bool ahbApiLoaded = false;
	if (ahbApiLoaded ||
			((pAhbFunctions->allocate != DE_NULL) &&
			 (pAhbFunctions->describe != DE_NULL) &&
			 (pAhbFunctions->acquire  != DE_NULL) &&
			 (pAhbFunctions->release  != DE_NULL) &&
			 (pAhbFunctions->isSupported  != DE_NULL)))
	{
		ahbApiLoaded = true;
		return true;
	}
	return false;
}

bool loadAhbDynamicApis (deInt32 sdkVersion)
{
	if (sdkVersion >= __ANDROID_API_O__)
	{
		if (!ahbFunctionsLoaded(&ahbFunctions))
		{
			static de::DynamicLibrary libnativewindow("libnativewindow.so");
			ahbFunctions.allocate = reinterpret_cast<pfnAHardwareBuffer_allocate>(libnativewindow.getFunction("AHardwareBuffer_allocate"));
			ahbFunctions.describe = reinterpret_cast<pfnAHardwareBuffer_describe>(libnativewindow.getFunction("AHardwareBuffer_describe"));
			ahbFunctions.acquire  = reinterpret_cast<pfnAHardwareBuffer_acquire>(libnativewindow.getFunction("AHardwareBuffer_acquire"));
			ahbFunctions.release  = reinterpret_cast<pfnAHardwareBuffer_release>(libnativewindow.getFunction("AHardwareBuffer_release"));
			ahbFunctions.isSupported  = reinterpret_cast<pfnAHardwareBuffer_isSupported>(libnativewindow.getFunction("AHardwareBuffer_isSupported"));

			return ahbFunctionsLoaded(&ahbFunctions);
		}
		else
		{
			return true;
		}
	}

	return false;
}

AHardwareBuffer_Format getPixelFormat (GLenum format)
{
	switch (format)
	{
		case GL_RGB565:				return AHARDWAREBUFFER_FORMAT_R5G6B5_UNORM;
		case GL_RGB8:				return AHARDWAREBUFFER_FORMAT_R8G8B8_UNORM;
		case GL_RGBA8:				return AHARDWAREBUFFER_FORMAT_R8G8B8A8_UNORM;
		case GL_DEPTH_COMPONENT16:	return AHARDWAREBUFFER_FORMAT_D16_UNORM;
		case GL_DEPTH_COMPONENT24:	return AHARDWAREBUFFER_FORMAT_D24_UNORM;
		case GL_DEPTH24_STENCIL8:	return AHARDWAREBUFFER_FORMAT_D24_UNORM_S8_UINT;
		case GL_DEPTH_COMPONENT32F:	return AHARDWAREBUFFER_FORMAT_D32_FLOAT;
		case GL_DEPTH32F_STENCIL8:	return AHARDWAREBUFFER_FORMAT_D32_FLOAT_S8_UINT;
		case GL_RGB10_A2:			return AHARDWAREBUFFER_FORMAT_R10G10B10A2_UNORM;
		case GL_RGBA16F:			return AHARDWAREBUFFER_FORMAT_R16G16B16A16_FLOAT;
		case GL_STENCIL_INDEX8:		return AHARDWAREBUFFER_FORMAT_S8_UINT;

		default:					TCU_THROW(NotSupportedError, "Texture format unsupported by Android");
	}
}

class AndroidNativeClientBuffer : public ClientBuffer
{
public:
						AndroidNativeClientBuffer	(const Library& egl, GLenum format);
						~AndroidNativeClientBuffer	(void);
	EGLClientBuffer		get							(void) const;
	void				lock						(void** data);
	void				unlock						(void);

private:
	const Library&		m_egl;
	AHardwareBuffer*	m_hardwareBuffer;
};

AndroidNativeClientBuffer::AndroidNativeClientBuffer (const Library& egl, GLenum format)
	: m_egl(egl)
{
	//deInt32 sdkVersion = checkAnbApiBuild();
	deInt32 sdkVersion = androidGetSdkVersion();
#if defined(BUILT_WITH_ANDROID_P_HARDWARE_BUFFER)
	// When testing AHB on Android-P and newer the CTS must be compiled against API28 or newer.
	DE_TEST_ASSERT(sdkVersion >= 28); /*__ANDROID_API_P__ */
#else
	// When testing AHB on Android-O and newer the CTS must be compiled against API26 or newer.
	DE_TEST_ASSERT(sdkVersion >= 26); /* __ANDROID_API_O__ */
#endif // !defined(BUILT_WITH_ANDROID_P_HARDWARE_BUFFER)

	if (sdkVersion >= __ANDROID_API_O__)
	{
#if defined(BUILT_WITH_ANDROID_HARDWARE_BUFFER)
		if (!loadAhbDynamicApis(sdkVersion))
		{
			// Couldn't load Android AHB system APIs.
			DE_TEST_ASSERT(false);
		}
#else
		// Invalid Android AHB APIs configuration. Please check the instructions on how to build NDK for Android.
		DE_TEST_ASSERT(false);
#endif // defined(BUILT_WITH_ANDROID_HARDWARE_BUFFER)
	}

	AHardwareBuffer_Desc hbufferdesc = {
		64u,
		64u,
		1u,		// number of images
		getPixelFormat(format),
		AHARDWAREBUFFER_USAGE_CPU_READ_OFTEN	|
		AHARDWAREBUFFER_USAGE_CPU_WRITE_RARELY	|
		AHARDWAREBUFFER_USAGE_GPU_SAMPLED_IMAGE	|
		AHARDWAREBUFFER_USAGE_GPU_FRAMEBUFFER,
		0u,		// Stride in pixels, ignored for AHardwareBuffer_allocate()
		0u,		// Initialize to zero, reserved for future use
		0u		// Initialize to zero, reserved for future use
	};

	if (!ahbFunctions.isSupported(&hbufferdesc))
		TCU_THROW(NotSupportedError, "Texture format unsupported");

	ahbFunctions.allocate(&hbufferdesc, &m_hardwareBuffer);
}

AndroidNativeClientBuffer::~AndroidNativeClientBuffer (void)
{
	ahbFunctions.release(m_hardwareBuffer);
}

EGLClientBuffer AndroidNativeClientBuffer::get (void) const
{
	typedef EGLW_APICALL EGLClientBuffer (EGLW_APIENTRY* eglGetNativeClientBufferANDROIDFunc) (const struct AHardwareBuffer *buffer);
	return ((eglGetNativeClientBufferANDROIDFunc)m_egl.getProcAddress("eglGetNativeClientBufferANDROID"))(m_hardwareBuffer);
}

void AndroidNativeClientBuffer::lock(void** data)
{
	const int status = AHardwareBuffer_lock(m_hardwareBuffer, AHARDWAREBUFFER_USAGE_CPU_WRITE_RARELY, -1, DE_NULL, data);

	if (status != 0)
		TCU_FAIL(("AHardwareBuffer_lock failed with error: " + de::toString(status)).c_str());
}

void AndroidNativeClientBuffer::unlock(void)
{
	const int status = AHardwareBuffer_unlock(m_hardwareBuffer, DE_NULL);

	if (status != 0)
		TCU_FAIL(("AHardwareBuffer_unlock failed with error: " + de::toString(status)).c_str());
}

class AndroidNativeImageSource : public ImageSource
{
public:
							AndroidNativeImageSource	(GLenum format) : m_format(format) {}
							~AndroidNativeImageSource	(void);
	MovePtr<ClientBuffer>	createBuffer				(const Library& egl, const glw::Functions&, Texture2D*) const;
	string					getRequiredExtension		(void) const { return "EGL_ANDROID_get_native_client_buffer"; }
	EGLImageKHR				createImage					(const Library& egl, EGLDisplay dpy, EGLContext ctx, EGLClientBuffer clientBuffer) const;
	GLenum					getEffectiveFormat			(void) const { return m_format; }

protected:
	GLenum					m_format;
};

AndroidNativeImageSource::~AndroidNativeImageSource (void)
{
}

MovePtr<ClientBuffer> AndroidNativeImageSource::createBuffer (const Library& egl, const glw::Functions&, Texture2D* ref) const
{
	MovePtr<AndroidNativeClientBuffer> buffer (new AndroidNativeClientBuffer(egl, m_format));

	if (ref != DE_NULL)
	{
		const TextureFormat	texFormat	= glu::mapGLInternalFormat(m_format);
		void*				bufferData	= DE_NULL;

		*ref = Texture2D(texFormat, 64, 64);
		ref->allocLevel(0);
		tcu::fillWithComponentGradients(ref->getLevel(0),
										tcu::Vec4(0.0f, 0.0f, 0.0f, 0.0f),
										tcu::Vec4(1.0f, 1.0f, 1.0f, 1.0f));
        buffer->lock(&bufferData);
		{
			PixelBufferAccess nativeBuffer(texFormat, 64, 64, 1, bufferData);
			tcu::copy(nativeBuffer, ref->getLevel(0));
		}
        buffer->unlock();
	}
	return MovePtr<ClientBuffer>(buffer);
}

EGLImageKHR AndroidNativeImageSource::createImage (const Library& egl, EGLDisplay dpy, EGLContext, EGLClientBuffer clientBuffer) const
{
	static const EGLint	attribs[]	= { EGL_IMAGE_PRESERVED_KHR, EGL_TRUE, EGL_NONE };
	const EGLImageKHR	image		= egl.createImageKHR(dpy, EGL_NO_CONTEXT, EGL_NATIVE_BUFFER_ANDROID, clientBuffer, attribs);

	EGLU_CHECK_MSG(egl, "eglCreateImageKHR()");
	return image;
}

} // anonymous

MovePtr<ImageSource> createAndroidNativeImageSource	(GLenum format)
{
	try
	{
		return MovePtr<ImageSource>(new AndroidNativeImageSource(format));
	}
	catch (const std::runtime_error& exc)
	{
		return createUnsupportedImageSource(string("Android native buffers unsupported: ") + exc.what(), format);
	}
}

#endif // DE_OS == DE_OS_ANDROID

} // Image
} // egl
} // deqp