#ifndef _GLUSHADERLIBRARY_HPP
#define _GLUSHADERLIBRARY_HPP
/*-------------------------------------------------------------------------
 * drawElements Quality Program OpenGL ES Utilities
 * ------------------------------------------------
 *
 * Copyright 2015 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 Shader .test file utilities.
 *//*--------------------------------------------------------------------*/

#include "gluDefs.hpp"
#include "gluVarType.hpp"
#include "gluShaderProgram.hpp"
#include "tcuTestCase.hpp"

#include <string>
#include <vector>

namespace glu
{
namespace sl
{

enum CaseType
{
	CASETYPE_COMPLETE = 0,		//!< Has all shaders specified separately.
	CASETYPE_VERTEX_ONLY,		//!< "Both" case, vertex shader sub case.
	CASETYPE_FRAGMENT_ONLY,		//!< "Both" case, fragment shader sub case.

	CASETYPE_LAST
};

enum ExpectResult
{
	EXPECT_PASS = 0,
	EXPECT_COMPILE_FAIL,
	EXPECT_LINK_FAIL,
	EXPECT_COMPILE_LINK_FAIL,
	EXPECT_VALIDATION_FAIL,
	EXPECT_BUILD_SUCCESSFUL,

	EXPECT_LAST
};

enum OutputType
{
	OUTPUT_RESULT = 0,
	OUTPUT_COLOR,

	OUTPUT_LAST
};

struct Value
{
	union Element
	{
		float		float32;
		deInt32		int32;
		deInt32		bool32;
	};

	VarType					type;
	std::string				name;
	std::vector<Element>	elements;		// Scalar values (variable.varType.getScalarSize() * #values).
};

struct ValueBlock
{
	std::vector<Value>		inputs;
	std::vector<Value>		outputs;
	std::vector<Value>		uniforms;
};

enum CapabilityType
{
	CAPABILITY_LIMIT = 0,
	CAPABILITY_FLAG,

	CAPABILITY_LAST
};

enum CapabilityFlag
{
	CAPABILITY_FULL_GLSL_ES_100_SUPPORT,
	CAPABILITY_ONLY_GLSL_ES_100_SUPPORT, // only ES2, no ES3 capability
	CAPABILITY_EXACTLY_ONE_DRAW_BUFFER	 // gl_MaxDrawBuffers is exactly 1
};

struct RequiredCapability
{
	CapabilityType			type;

	union
	{
		CapabilityFlag		flagName;
		deUint32			enumName;
	};

	int						referenceValue;

	RequiredCapability (CapabilityFlag flagName_)
		: type				(CAPABILITY_FLAG)
		, flagName			(flagName_)
		, referenceValue	(0) // not used
	{
	}

	RequiredCapability (deUint32 enumName_, int referenceValue_)
		: type				(CAPABILITY_LIMIT)
		, enumName			(enumName_)
		, referenceValue	(referenceValue_)
	{
	}
};

struct RequiredExtension
{
	std::vector<std::string>	alternatives;		// One or more extensions, at least one (but not all) must be supported
	deUint32					effectiveStages;	// Bitfield of shader stages requiring this extension

	RequiredExtension (const std::vector<std::string>&	alternatives_,
					   deUint32							effectiveStages_)
		: alternatives		(alternatives_)
		, effectiveStages	(effectiveStages_)
	{
	}

		RequiredExtension (const std::string&	extension,
						   deUint32				effectiveStages_)
		: effectiveStages	(effectiveStages_)
	{
		alternatives.push_back(extension);
	}

	RequiredExtension (void)
		: effectiveStages	(0u)
	{
	}
};

struct ProgramSpecification
{
	glu::ProgramSources				sources;
	std::vector<RequiredExtension>	requiredExtensions;
	deUint32						activeStages;	// Has an effect only if sources.separable == true, must be 0 otherwise

	ProgramSpecification (void)
		: activeStages(0u)
	{
	}
};

struct ShaderCaseSpecification
{
	CaseType							caseType;
	ExpectResult						expectResult;
	OutputType							outputType;
	DataType							outputFormat;
	glu::GLSLVersion					targetVersion;

	std::vector<RequiredCapability>		requiredCaps;

	ValueBlock							values;
	std::vector<ProgramSpecification>	programs;

	ShaderCaseSpecification (void)
		: caseType				(CASETYPE_LAST)
		, expectResult			(EXPECT_LAST)
		, outputType			(OUTPUT_RESULT)
		, outputFormat			(TYPE_LAST)
		, targetVersion			(glu::GLSL_VERSION_LAST)
	{
	}
};

bool	isValid		(const ValueBlock& block);
bool	isValid		(const ShaderCaseSpecification& spec);

bool	isCapabilityRequired(CapabilityFlag capabilityFlag, const ShaderCaseSpecification& spec);

class ShaderCaseFactory
{
public:
	virtual ~ShaderCaseFactory () {}
	virtual tcu::TestCaseGroup*	createGroup	(const std::string& name, const std::string& description, const std::vector<tcu::TestNode*>& children) = 0;
	virtual tcu::TestCase*		createCase	(const std::string& name, const std::string& description, const ShaderCaseSpecification& spec) = 0;
};

std::vector<tcu::TestNode*>		parseFile	(const tcu::Archive& archive, const std::string& filename, ShaderCaseFactory* caseFactory);

// Specialization utilties

struct ProgramSpecializationParams
{
	const ShaderCaseSpecification&			caseSpec;
	const std::vector<RequiredExtension>	requiredExtensions;	// Extensions, must be resolved to single ext per entry
	const int								maxPatchVertices;	// Used by tess shaders only

	ProgramSpecializationParams (const ShaderCaseSpecification&			caseSpec_,
								 const std::vector<RequiredExtension>&	requiredExtensions_,
								 int									maxPatchVertices_)
		: caseSpec				(caseSpec_)
		, requiredExtensions	(requiredExtensions_)
		, maxPatchVertices		(maxPatchVertices_)
	{
	}
};

void			genCompareFunctions			(std::ostringstream& stream, const ValueBlock& valueBlock, bool useFloatTypes);
std::string		injectExtensionRequirements	(const std::string& baseCode, const std::vector<RequiredExtension>& extensions, ShaderType shaderType);

// Other utilities

void			dumpValues					(tcu::TestLog& log, const ValueBlock& values, int arrayNdx);

} // sl
} // glu

#endif // _GLUSHADERLIBRARY_HPP