#ifndef _GLURENDERCONTEXT_HPP
#define _GLURENDERCONTEXT_HPP
/*-------------------------------------------------------------------------
 * drawElements Quality Program OpenGL ES Utilities
 * ------------------------------------------------
 *
 * 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 OpenGL ES rendering context.
 *//*--------------------------------------------------------------------*/

#include "tcuDefs.hpp"

namespace tcu
{
class CommandLine;
class Platform;
class RenderTarget;
}

namespace glw
{
class Functions;
class FunctionLoader;
}

namespace glu
{

class ContextType;
class ContextInfo;

enum Profile
{
	PROFILE_ES = 0,			//!< OpenGL ES
	PROFILE_CORE,			//!< OpenGL Core Profile
	PROFILE_COMPATIBILITY,	//!< OpenGL Compatibility Profile

	PROFILE_LAST
};

enum ContextFlags
{
	CONTEXT_ROBUST				= (1<<0),	//!< Robust context
	CONTEXT_DEBUG				= (1<<1),	//!< Debug context
	CONTEXT_FORWARD_COMPATIBLE	= (1<<2)	//!< Forward-compatible context
};

inline ContextFlags	operator| (ContextFlags a, ContextFlags b)	{ return ContextFlags((deUint32)a|(deUint32)b);	}
inline ContextFlags	operator& (ContextFlags a, ContextFlags b)	{ return ContextFlags((deUint32)a&(deUint32)b);	}
inline ContextFlags	operator~ (ContextFlags a)					{ return ContextFlags(~(deUint32)a);			}

/*--------------------------------------------------------------------*//*!
 * \brief Rendering API version and profile.
 *//*--------------------------------------------------------------------*/
class ApiType
{
public:
						ApiType			(void) : m_bits(pack(0, 0, PROFILE_LAST)) {}
						ApiType			(int major, int minor, Profile profile) : m_bits(pack(major, minor, profile)) {}

	int					getMajorVersion	(void) const	{ return int((m_bits>>MAJOR_SHIFT)			& ((1u<<MAJOR_BITS)-1u));	}
	int					getMinorVersion	(void) const	{ return int((m_bits>>MINOR_SHIFT)			& ((1u<<MINOR_BITS)-1u));	}
	Profile				getProfile		(void) const	{ return Profile((m_bits>>PROFILE_SHIFT)	& ((1u<<PROFILE_BITS)-1u));	}

	bool				operator==		(ApiType other) const	{ return m_bits == other.m_bits;						}
	bool				operator!=		(ApiType other) const	{ return m_bits != other.m_bits;						}

	// Shorthands
	static ApiType		es				(int major, int minor)	{ return ApiType(major, minor, PROFILE_ES);				}
	static ApiType		core			(int major, int minor)	{ return ApiType(major, minor, PROFILE_CORE);			}
	static ApiType		compatibility	(int major, int minor)	{ return ApiType(major, minor, PROFILE_COMPATIBILITY);	}

protected:
						ApiType			(deUint32 bits) : m_bits(bits) {}
	static ApiType		fromBits		(deUint32 bits)	{ return ApiType(bits);	}

	static deUint32		pack			(int major, int minor, Profile profile);

	deUint32			m_bits;

	enum
	{
		MAJOR_BITS		= 4,
		MINOR_BITS		= 4,
		PROFILE_BITS	= 2,
		TOTAL_API_BITS	= MAJOR_BITS+MINOR_BITS+PROFILE_BITS,

		MAJOR_SHIFT		= 0,
		MINOR_SHIFT		= MAJOR_SHIFT+MAJOR_BITS,
		PROFILE_SHIFT	= MINOR_SHIFT+MINOR_BITS
	};
};

inline deUint32 ApiType::pack (int major, int minor, Profile profile)
{
	deUint32 bits = 0;

	DE_ASSERT((deUint32(major) & ~((1<<MAJOR_BITS)-1)) == 0);
	DE_ASSERT((deUint32(minor) & ~((1<<MINOR_BITS)-1)) == 0);
	DE_ASSERT((deUint32(profile) & ~((1<<PROFILE_BITS)-1)) == 0);

	bits |= deUint32(major) << MAJOR_SHIFT;
	bits |= deUint32(minor) << MINOR_SHIFT;
	bits |= deUint32(profile) << PROFILE_SHIFT;

	return bits;
}

/*--------------------------------------------------------------------*//*!
 * \brief Rendering context type.
 *
 * ContextType differs from API type by adding context flags. They are
 * crucial in for example determining when GL core context supports
 * certain API version (forward-compatible bit).
 *
 * \note You should NEVER compare ContextTypes against each other, as
 *       you most likely don't want to take flags into account. For example
 *       the test code almost certainly doesn't want to check that you have
 *       EXACTLY ES3.1 context with debug, but without for example robustness.
 *//*--------------------------------------------------------------------*/
class ContextType : private ApiType
{
public:
						ContextType		(void) {}
						ContextType		(int major, int minor, Profile profile, ContextFlags flags = ContextFlags(0));
	explicit			ContextType		(ApiType apiType, ContextFlags flags = ContextFlags(0));

	ApiType				getAPI			(void) const	{ return ApiType::fromBits(m_bits & ((1u<<TOTAL_API_BITS)-1u));			}
	ContextFlags		getFlags		(void) const	{ return ContextFlags((m_bits>>FLAGS_SHIFT)	& ((1u<<FLAGS_BITS)-1u));	}

	using ApiType::getMajorVersion;
	using ApiType::getMinorVersion;
	using ApiType::getProfile;

protected:
	static deUint32		pack			(deUint32 apiBits, ContextFlags flags);

	enum
	{
		FLAGS_BITS			= 3,
		TOTAL_CONTEXT_BITS	= TOTAL_API_BITS+FLAGS_BITS,
		FLAGS_SHIFT			= TOTAL_API_BITS
	};
};

inline ContextType::ContextType (int major, int minor, Profile profile, ContextFlags flags)
	: ApiType(major, minor, profile)
{
	m_bits = pack(m_bits, flags);
}

inline ContextType::ContextType (ApiType apiType, ContextFlags flags)
	: ApiType(apiType)
{
	m_bits = pack(m_bits, flags);
}

inline deUint32 ContextType::pack (deUint32 apiBits, ContextFlags flags)
{
	deUint32 bits = apiBits;

	DE_ASSERT((deUint32(flags) & ~((1<<FLAGS_BITS)-1)) == 0);
	bits |= deUint32(flags) << FLAGS_SHIFT;

	return bits;
}

inline bool		isContextTypeES				(ContextType type)	{ return type.getAPI().getProfile() == PROFILE_ES;				}
inline bool		isContextTypeGLCore			(ContextType type)	{ return type.getAPI().getProfile() == PROFILE_CORE;			}
inline bool		isContextTypeGLCompatibility(ContextType type)	{ return type.getAPI().getProfile() == PROFILE_COMPATIBILITY;	}
bool			contextSupports				(ContextType ctxType, ApiType requiredApiType);

/*--------------------------------------------------------------------*//*!
 * \brief Rendering context abstraction.
 *//*--------------------------------------------------------------------*/
class RenderContext
{
public:
										RenderContext			(void) {}
	virtual								~RenderContext			(void) {}

	//! Get context type. Must match to type given to ContextFactory::createContext().
	virtual ContextType					getType					(void) const	= DE_NULL;

	//! Get GL function table. Should be filled with all core entry points for context type.
	virtual const glw::Functions&		getFunctions			(void) const	= DE_NULL;

	//! Get render target information.
	virtual const tcu::RenderTarget&	getRenderTarget			(void) const	= DE_NULL;

	//! Do post-render actions (swap buffers for example).
	virtual void						postIterate				(void)			= DE_NULL;

	//! Get default framebuffer.
	virtual deUint32					getDefaultFramebuffer	(void) const { return 0; }

private:
										RenderContext			(const RenderContext& other); // Not allowed!
	RenderContext&						operator=				(const RenderContext& other); // Not allowed!
};

// Utilities

RenderContext*		createDefaultRenderContext		(tcu::Platform& platform, const tcu::CommandLine& cmdLine, ApiType apiType);

void				initCoreFunctions				(glw::Functions* dst, const glw::FunctionLoader* loader, ApiType apiType);
void				initExtensionFunctions			(glw::Functions* dst, const glw::FunctionLoader* loader, ApiType apiType, int numExtensions, const char* const* extensions);

// \note initFunctions() and initExtensionFunctions() without explicit extension list
//		 use glGetString* to query list of extensions, so it needs current GL context.
void				initFunctions					(glw::Functions* dst, const glw::FunctionLoader* loader, ApiType apiType);
void				initExtensionFunctions			(glw::Functions* dst, const glw::FunctionLoader* loader, ApiType apiType);

} // glu

#endif // _GLURENDERCONTEXT_HPP