/*-------------------------------------------------------------------------
 * OpenGL Conformance Test Suite
 * -----------------------------
 *
 * Copyright (c) 2017 The Khronos Group Inc.
 *
 * 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  glcShaderConstExprTests.cpp
 * \brief Declares shader constant expressions tests.
 */ /*-------------------------------------------------------------------*/

#include "glcShaderConstExprTests.hpp"
#include "deMath.h"
#include "deSharedPtr.hpp"
#include "glsShaderExecUtil.hpp"
#include "gluContextInfo.hpp"
#include "gluShaderUtil.hpp"
#include "tcuFloat.hpp"
#include "tcuStringTemplate.hpp"
#include "tcuTestLog.hpp"
#include <map>

using namespace deqp::gls::ShaderExecUtil;

namespace glcts
{

namespace ShaderConstExpr
{

struct TestParams
{
	const char* name;
	const char* expression;

	glu::DataType inType;
	int			  minComponents;
	int			  maxComponents;

	glu::DataType outType;
	union {
		float outputFloat;
		int   outputInt;
	};
};

struct ShaderExecutorParams
{
	deqp::Context* context;

	std::string caseName;
	std::string source;

	glu::DataType outType;
	union {
		float outputFloat;
		int   outputInt;
	};
};

template <typename OutputType>
class ExecutorTestCase : public deqp::TestCase
{
public:
	ExecutorTestCase(deqp::Context& context, const char* name, glu::ShaderType shaderType, const ShaderSpec& shaderSpec,
					 OutputType expectedOutput);
	virtual ~ExecutorTestCase(void);
	virtual tcu::TestNode::IterateResult iterate(void);

protected:
	void validateOutput(de::SharedPtr<ShaderExecutor> executor);

	glu::ShaderType m_shaderType;
	ShaderSpec		m_shaderSpec;
	OutputType		m_expectedOutput;
};

template <typename OutputType>
ExecutorTestCase<OutputType>::ExecutorTestCase(deqp::Context& context, const char* name, glu::ShaderType shaderType,
											   const ShaderSpec& shaderSpec, OutputType expectedOutput)
	: deqp::TestCase(context, name, "")
	, m_shaderType(shaderType)
	, m_shaderSpec(shaderSpec)
	, m_expectedOutput(expectedOutput)
{
}

template <typename OutputType>
ExecutorTestCase<OutputType>::~ExecutorTestCase(void)
{
}

template <>
void ExecutorTestCase<float>::validateOutput(de::SharedPtr<ShaderExecutor> executor)
{
	float		result  = 0.0f;
	void* const outputs = &result;
	executor->execute(1, DE_NULL, &outputs);

	const float epsilon = 0.01f;
	if (de::abs(m_expectedOutput - result) > epsilon)
	{
		m_context.getTestContext().getLog()
			<< tcu::TestLog::Message << "Expected: " << m_expectedOutput << " ("
			<< tcu::toHex(tcu::Float32(m_expectedOutput).bits()) << ") but constant expresion returned: " << result
			<< " (" << tcu::toHex(tcu::Float32(result).bits()) << "), used " << epsilon << " epsilon for comparison"
			<< tcu::TestLog::EndMessage;
		m_testCtx.setTestResult(QP_TEST_RESULT_FAIL, "Fail");
		return;
	}

	m_testCtx.setTestResult(QP_TEST_RESULT_PASS, "Pass");
	return;
}

template <>
void ExecutorTestCase<int>::validateOutput(de::SharedPtr<ShaderExecutor> executor)
{
	int			result  = 0;
	void* const outputs = &result;
	executor->execute(1, DE_NULL, &outputs);

	if (result == m_expectedOutput)
	{
		m_testCtx.setTestResult(QP_TEST_RESULT_PASS, "Pass");
		return;
	}

	m_context.getTestContext().getLog() << tcu::TestLog::Message << "Expected: " << m_expectedOutput
										<< " but constant expresion returned: " << result << tcu::TestLog::EndMessage;
	m_testCtx.setTestResult(QP_TEST_RESULT_FAIL, "Fail");
}

template <typename OutputType>
tcu::TestNode::IterateResult ExecutorTestCase<OutputType>::iterate(void)
{
	de::SharedPtr<ShaderExecutor> executor(createExecutor(m_context.getRenderContext(), m_shaderType, m_shaderSpec));

	DE_ASSERT(executor.get());

	executor->log(m_context.getTestContext().getLog());

	try
	{
		if (!executor->isOk())
			TCU_FAIL("Compilation failed");

		executor->useProgram();

		validateOutput(executor);
	}
	catch (const tcu::NotSupportedError& e)
	{
		m_testCtx.getLog() << tcu::TestLog::Message << e.what() << tcu::TestLog::EndMessage;
		m_testCtx.setTestResult(QP_TEST_RESULT_NOT_SUPPORTED, e.getMessage());
	}
	catch (const tcu::TestError& e)
	{
		m_testCtx.getLog() << tcu::TestLog::Message << e.what() << tcu::TestLog::EndMessage;
		m_testCtx.setTestResult(QP_TEST_RESULT_FAIL, e.getMessage());
	}

	return tcu::TestNode::STOP;
}

template <typename OutputType>
void createTestCasesForAllShaderTypes(const ShaderExecutorParams& params, std::vector<tcu::TestNode*>& outputTests)
{
	DE_ASSERT(params.context);

	deqp::Context&   context	 = *(params.context);
	glu::ContextType contextType = context.getRenderContext().getType();

	ShaderSpec shaderSpec;
	shaderSpec.version = glu::getContextTypeGLSLVersion(contextType);
	shaderSpec.source  = params.source;
	shaderSpec.outputs.push_back(Symbol("out0", glu::VarType(params.outType, glu::PRECISION_HIGHP)));

	// Construct list of shaders for which tests can be created
	std::vector<glu::ShaderType> shaderTypes;

	if (glu::contextSupports(contextType, glu::ApiType::core(4, 3)))
	{
		shaderTypes.push_back(glu::SHADERTYPE_VERTEX);
		shaderTypes.push_back(glu::SHADERTYPE_FRAGMENT);
		shaderTypes.push_back(glu::SHADERTYPE_COMPUTE);
		shaderTypes.push_back(glu::SHADERTYPE_GEOMETRY);
		shaderTypes.push_back(glu::SHADERTYPE_TESSELLATION_CONTROL);
		shaderTypes.push_back(glu::SHADERTYPE_TESSELLATION_EVALUATION);
	}
	else if (glu::contextSupports(contextType, glu::ApiType::es(3, 2)))
	{
		shaderSpec.version = glu::GLSL_VERSION_320_ES;
		shaderTypes.push_back(glu::SHADERTYPE_GEOMETRY);
		shaderTypes.push_back(glu::SHADERTYPE_TESSELLATION_CONTROL);
		shaderTypes.push_back(glu::SHADERTYPE_TESSELLATION_EVALUATION);
	}
	else if (glu::contextSupports(contextType, glu::ApiType::es(3, 1)))
	{
		shaderSpec.version = glu::GLSL_VERSION_310_ES;
		shaderTypes.push_back(glu::SHADERTYPE_COMPUTE);
		shaderTypes.push_back(glu::SHADERTYPE_GEOMETRY);
		shaderTypes.push_back(glu::SHADERTYPE_TESSELLATION_CONTROL);
		shaderTypes.push_back(glu::SHADERTYPE_TESSELLATION_EVALUATION);
	}
	else
	{
		shaderTypes.push_back(glu::SHADERTYPE_VERTEX);
		shaderTypes.push_back(glu::SHADERTYPE_FRAGMENT);
	}

	shaderSpec.globalDeclarations += "precision highp float;\n";

	for (std::size_t typeIndex = 0; typeIndex < shaderTypes.size(); ++typeIndex)
	{
		glu::ShaderType shaderType = shaderTypes[typeIndex];
		std::string		caseName(params.caseName + '_' + getShaderTypeName(shaderType));

		outputTests.push_back(
			new ExecutorTestCase<OutputType>(context, caseName.c_str(), shaderType, shaderSpec, static_cast<OutputType>(params.outputFloat)));
	}
}

void createTests(deqp::Context& context, const TestParams* cases, int numCases, const char* shaderTemplateSrc,
				 const char* casePrefix, std::vector<tcu::TestNode*>& outputTests)
{
	const tcu::StringTemplate shaderTemplate(shaderTemplateSrc);
	const char*				  componentAccess[] = { "", ".y", ".z", ".w" };

	ShaderExecutorParams shaderExecutorParams;
	shaderExecutorParams.context = &context;

	for (int caseIndex = 0; caseIndex < numCases; caseIndex++)
	{
		const TestParams&   testCase	  = cases[caseIndex];
		const std::string   baseName	  = testCase.name;
		const int			minComponents = testCase.minComponents;
		const int			maxComponents = testCase.maxComponents;
		const glu::DataType inType		  = testCase.inType;
		const std::string   expression	= testCase.expression;

		// Check for presence of func(vec, scalar) style specialization,
		// use as gatekeeper for applying said specialization
		const bool alwaysScalar = expression.find("${MT}") != std::string::npos;

		std::map<std::string, std::string> shaderTemplateParams;
		shaderTemplateParams["CASE_BASE_TYPE"] = glu::getDataTypeName(testCase.outType);

		shaderExecutorParams.outType	 = testCase.outType;
		shaderExecutorParams.outputFloat = testCase.outputFloat;

		for (int component = minComponents - 1; component < maxComponents; component++)
		{
			// Get type name eg. float, vec2, vec3, vec4 (same for other primitive types)
			glu::DataType dataType = static_cast<glu::DataType>(inType + component);
			std::string   typeName = glu::getDataTypeName(dataType);

			// ${T} => final type, ${MT} => final type but with scalar version usable even when T is a vector
			std::map<std::string, std::string> expressionTemplateParams;
			expressionTemplateParams["T"]  = typeName;
			expressionTemplateParams["MT"] = typeName;

			const tcu::StringTemplate expressionTemplate(expression);

			// Add vector access to expression as needed
			shaderTemplateParams["CASE_EXPRESSION"] =
				expressionTemplate.specialize(expressionTemplateParams) + componentAccess[component];

			{
				// Add type to case name if we are generating multiple versions
				shaderExecutorParams.caseName = (casePrefix + baseName);
				if (minComponents != maxComponents)
					shaderExecutorParams.caseName += ("_" + typeName);

				shaderExecutorParams.source = shaderTemplate.specialize(shaderTemplateParams);
				if (shaderExecutorParams.outType == glu::TYPE_FLOAT)
					createTestCasesForAllShaderTypes<float>(shaderExecutorParams, outputTests);
				else
					createTestCasesForAllShaderTypes<int>(shaderExecutorParams, outputTests);
			}

			// Deal with functions that allways accept one ore more scalar parameters even when others are vectors
			if (alwaysScalar && component > 0)
			{
				shaderExecutorParams.caseName =
					casePrefix + baseName + "_" + typeName + "_" + glu::getDataTypeName(inType);

				expressionTemplateParams["MT"] = glu::getDataTypeName(inType);
				shaderTemplateParams["CASE_EXPRESSION"] =
					expressionTemplate.specialize(expressionTemplateParams) + componentAccess[component];

				shaderExecutorParams.source = shaderTemplate.specialize(shaderTemplateParams);
				if (shaderExecutorParams.outType == glu::TYPE_FLOAT)
					createTestCasesForAllShaderTypes<float>(shaderExecutorParams, outputTests);
				else
					createTestCasesForAllShaderTypes<int>(shaderExecutorParams, outputTests);
			}
		} // component loop
	}
}

} // namespace ShaderConstExpr

ShaderConstExprTests::ShaderConstExprTests(deqp::Context& context)
	: deqp::TestCaseGroup(context, "constant_expressions", "Constant expressions")
{
}

ShaderConstExprTests::~ShaderConstExprTests(void)
{
}

void ShaderConstExprTests::init(void)
{
	// Needed for autogenerating shader code for increased component counts
	DE_STATIC_ASSERT(glu::TYPE_FLOAT + 1 == glu::TYPE_FLOAT_VEC2);
	DE_STATIC_ASSERT(glu::TYPE_FLOAT + 2 == glu::TYPE_FLOAT_VEC3);
	DE_STATIC_ASSERT(glu::TYPE_FLOAT + 3 == glu::TYPE_FLOAT_VEC4);

	DE_STATIC_ASSERT(glu::TYPE_INT + 1 == glu::TYPE_INT_VEC2);
	DE_STATIC_ASSERT(glu::TYPE_INT + 2 == glu::TYPE_INT_VEC3);
	DE_STATIC_ASSERT(glu::TYPE_INT + 3 == glu::TYPE_INT_VEC4);

	DE_STATIC_ASSERT(glu::TYPE_UINT + 1 == glu::TYPE_UINT_VEC2);
	DE_STATIC_ASSERT(glu::TYPE_UINT + 2 == glu::TYPE_UINT_VEC3);
	DE_STATIC_ASSERT(glu::TYPE_UINT + 3 == glu::TYPE_UINT_VEC4);

	DE_STATIC_ASSERT(glu::TYPE_BOOL + 1 == glu::TYPE_BOOL_VEC2);
	DE_STATIC_ASSERT(glu::TYPE_BOOL + 2 == glu::TYPE_BOOL_VEC3);
	DE_STATIC_ASSERT(glu::TYPE_BOOL + 3 == glu::TYPE_BOOL_VEC4);

	// ${T} => final type, ${MT} => final type but with scalar version usable even when T is a vector
	const ShaderConstExpr::TestParams baseCases[] = {
		{ "radians",			"radians(${T} (90.0))",								glu::TYPE_FLOAT,	1,	4,	glu::TYPE_FLOAT,	{ deFloatRadians(90.0f) } },
		{ "degrees",			"degrees(${T} (2.0))",								glu::TYPE_FLOAT,	1,	4,	glu::TYPE_FLOAT,	{ deFloatDegrees(2.0f) } },
		{ "sin",				"sin(${T} (3.0))",									glu::TYPE_FLOAT,	1,	4,	glu::TYPE_FLOAT,	{ deFloatSin(3.0f) } },
		{ "cos",				"cos(${T} (3.2))",									glu::TYPE_FLOAT,	1,	4,	glu::TYPE_FLOAT,	{ deFloatCos(3.2f) } },
		{ "asin",				"asin(${T} (0.0))",									glu::TYPE_FLOAT,	1,	4,	glu::TYPE_FLOAT,	{ deFloatAsin(0.0f) } },
		{ "acos",				"acos(${T} (1.0))",									glu::TYPE_FLOAT,	1,	4,	glu::TYPE_FLOAT,	{ deFloatAcos(1.0f) } },
		{ "pow",				"pow(${T} (1.7), ${T} (3.5))",						glu::TYPE_FLOAT,	1,	4,	glu::TYPE_FLOAT,	{ deFloatPow(1.7f, 3.5f) } },
		{ "exp",				"exp(${T} (4.2))",									glu::TYPE_FLOAT,	1,	4,	glu::TYPE_FLOAT,	{ deFloatExp(4.2f) } },
		{ "log",				"log(${T} (42.12))",								glu::TYPE_FLOAT,	1,	4,	glu::TYPE_FLOAT,	{ deFloatLog(42.12f) } },
		{ "exp2",				"exp2(${T} (6.7))",									glu::TYPE_FLOAT,	1,	4,	glu::TYPE_FLOAT,	{ deFloatExp2(6.7f) } },
		{ "log2",				"log2(${T} (100.0))",								glu::TYPE_FLOAT,	1,	4,	glu::TYPE_FLOAT,	{ deFloatLog2(100.0f) } },
		{ "sqrt",				"sqrt(${T} (10.0))",								glu::TYPE_FLOAT,	1,	4,	glu::TYPE_FLOAT,	{ deFloatSqrt(10.0f) } },
		{ "inversesqrt",		"inversesqrt(${T} (10.0))",							glu::TYPE_FLOAT,	1,	4,	glu::TYPE_FLOAT,	{ deFloatRsq(10.0f) } },
		{ "abs",				"abs(${T} (-42))",									glu::TYPE_INT,		1,	4,	glu::TYPE_INT,		{ 42 } },
		{ "sign",				"sign(${T} (-18.0))",								glu::TYPE_FLOAT,	1,	4,	glu::TYPE_FLOAT,	{ -1.0f } },
		{ "floor",				"floor(${T} (37.3))",								glu::TYPE_FLOAT,	1,	4,	glu::TYPE_FLOAT,	{ deFloatFloor(37.3f) } },
		{ "trunc",				"trunc(${T} (-1.8))",								glu::TYPE_FLOAT,	1,	4,	glu::TYPE_FLOAT,	{ -1.0f } },
		{ "round",				"round(${T} (42.1))",								glu::TYPE_FLOAT,	1,	4,	glu::TYPE_FLOAT,	{ 42.0f } },
		{ "ceil",				"ceil(${T} (82.2))",								glu::TYPE_FLOAT,	1,	4,	glu::TYPE_FLOAT,	{ deFloatCeil(82.2f) } },
		{ "mod",				"mod(${T} (87.65), ${MT} (3.7))",					glu::TYPE_FLOAT,	1,	4,	glu::TYPE_FLOAT,	{ deFloatMod(87.65f, 3.7f) } },
		{ "min",				"min(${T} (12.3), ${MT} (32.1))",					glu::TYPE_FLOAT,	1,	4,	glu::TYPE_FLOAT,	{ 12.3f } },
		{ "max",				"max(${T} (12.3), ${MT} (32.1))",					glu::TYPE_FLOAT,	1,	4,	glu::TYPE_FLOAT,	{ 32.1f } },
		{ "clamp",				"clamp(${T} (42.1),	${MT} (10.0), ${MT} (15.0))",	glu::TYPE_FLOAT,	1,	4,	glu::TYPE_FLOAT,	{ 15.0f } },
		{ "length_float",		"length(1.0)",										glu::TYPE_FLOAT,	1,	1,	glu::TYPE_FLOAT,	{ 1.0f } },
		{ "length_vec2",		"length(vec2(1.0))",								glu::TYPE_FLOAT,	1,	1,	glu::TYPE_FLOAT,	{ deFloatSqrt(2.0f) } },
		{ "length_vec3",		"length(vec3(1.0))",								glu::TYPE_FLOAT,	1,	1,	glu::TYPE_FLOAT,	{ deFloatSqrt(3.0f) } },
		{ "length_vec4",		"length(vec4(1.0))",								glu::TYPE_FLOAT,	1,	1,	glu::TYPE_FLOAT,	{ deFloatSqrt(4.0f) } },
		{ "dot_float",			"dot(1.0, 1.0)",									glu::TYPE_FLOAT,	1,	1,	glu::TYPE_FLOAT,	{ 1.0f } },
		{ "dot_vec2",			"dot(vec2(1.0), vec2(1.0))",						glu::TYPE_FLOAT,	1,	1,	glu::TYPE_FLOAT,	{ 2.0f } },
		{ "dot_vec3",			"dot(vec3(1.0), vec3(1.0))",						glu::TYPE_FLOAT,	1,	1,	glu::TYPE_FLOAT,	{ 3.0f } },
		{ "dot_vec4",			"dot(vec4(1.0), vec4(1.0))",						glu::TYPE_FLOAT,	1,	1,	glu::TYPE_FLOAT,	{ 4.0f } },
		{ "normalize_float",	"normalize(1.0)",									glu::TYPE_FLOAT,	1,	1,	glu::TYPE_FLOAT,	{ 1.0f } },
		{ "normalize_vec2",		"normalize(vec2(1.0)).x",							glu::TYPE_FLOAT,	1,	1,	glu::TYPE_FLOAT,	{ deFloatRsq(2.0f) } },
		{ "normalize_vec3",		"normalize(vec3(1.0)).x",							glu::TYPE_FLOAT,	1,	1,	glu::TYPE_FLOAT,	{ deFloatRsq(3.0f) } },
		{ "normalize_vec4",		"normalize(vec4(1.0)).x",							glu::TYPE_FLOAT,	1,	1,	glu::TYPE_FLOAT,	{ deFloatRsq(4.0f) } },
	};

	const ShaderConstExpr::TestParams arrayCases[] = {
		{ "radians",			"radians(${T} (60.0))",							glu::TYPE_FLOAT,	1,	4,	glu::TYPE_INT,	{ deFloatRadians(60.0f) } },
		{ "degrees",			"degrees(${T} (0.11))",							glu::TYPE_FLOAT,	1,	4,	glu::TYPE_INT,	{ deFloatDegrees(0.11f) } },
		{ "sin",				"${T} (1.0) + sin(${T} (0.7))",					glu::TYPE_FLOAT,	1,	4,	glu::TYPE_INT,	{ 1.0f + deFloatSin(0.7f) } },
		{ "cos",				"${T} (1.0) + cos(${T} (0.7))",					glu::TYPE_FLOAT,	1,	4,	glu::TYPE_INT,	{ 1.0f + deFloatCos(0.7f) } },
		{ "asin",				"asin(${T} (0.9))",								glu::TYPE_FLOAT,	1,	4,	glu::TYPE_INT,	{ deFloatAsin(0.9f) } },
		{ "acos",				"acos(${T} (-0.5))",							glu::TYPE_FLOAT,	1,	4,	glu::TYPE_INT,	{ deFloatAcos(-0.5f) } },
		{ "pow",				"pow(${T} (2.0), ${T} (2.0))",					glu::TYPE_FLOAT,	1,	4,	glu::TYPE_INT,	{ deFloatPow(2.0f, 2.0f) } },
		{ "exp",				"exp(${T} (1.2))",								glu::TYPE_FLOAT,	1,	4,	glu::TYPE_INT,	{ deFloatExp(1.2f) } },
		{ "log",				"log(${T} (8.0))",								glu::TYPE_FLOAT,	1,	4,	glu::TYPE_INT,	{ deFloatLog(8.0f) } },
		{ "exp2",				"exp2(${T} (2.1))",								glu::TYPE_FLOAT,	1,	4,	glu::TYPE_INT,	{ deFloatExp2(2.1f) } },
		{ "log2",				"log2(${T} (9.0))",								glu::TYPE_FLOAT,	1,	4,	glu::TYPE_INT,	{ deFloatLog2(9.0) } },
		{ "sqrt",				"sqrt(${T} (4.5))",								glu::TYPE_FLOAT,	1,	4,	glu::TYPE_INT,	{ deFloatSqrt(4.5f) } },
		{ "inversesqrt",		"inversesqrt(${T} (0.26))",						glu::TYPE_FLOAT,	1,	4,	glu::TYPE_INT,	{ deFloatRsq(0.26f) } },
		{ "abs",				"abs(${T} (-2))",								glu::TYPE_INT,		1,	4,	glu::TYPE_INT,	{ 2 } },
		{ "sign",				"sign(${T} (18.0))",							glu::TYPE_FLOAT,	1,	4,	glu::TYPE_INT,	{ deFloatSign(18.0f) } },
		{ "floor",				"floor(${T} (3.3))",							glu::TYPE_FLOAT,	1,	4,	glu::TYPE_INT,	{ deFloatFloor(3.3f) } },
		{ "trunc",				"trunc(${T} (2.8))",							glu::TYPE_FLOAT,	1,	4,	glu::TYPE_INT,	{ 2 } },
		{ "round",				"round(${T} (2.2))",							glu::TYPE_FLOAT,	1,	4,	glu::TYPE_INT,	{ deFloatRound(2.2f) } },
		{ "ceil",				"ceil(${T} (2.2))",								glu::TYPE_FLOAT,	1,	4,	glu::TYPE_INT,	{ deFloatCeil(2.2f) } },
		{ "mod",				"mod(${T} (7.1), ${MT} (4.0))",					glu::TYPE_FLOAT,	1,	4,	glu::TYPE_INT,	{ deFloatMod(7.1f, 4.0f) } },
		{ "min",				"min(${T} (2.3), ${MT} (3.1))",					glu::TYPE_FLOAT,	1,	4,	glu::TYPE_INT,	{ deFloatMin(2.3f, 3.1f) } },
		{ "max",				"max(${T} (2.3), ${MT} (3.1))",					glu::TYPE_FLOAT,	1,	4,	glu::TYPE_INT,	{ deFloatMax(2.3f, 3.1f) } },
		{ "clamp",				"clamp(${T} (4.1),	${MT} (2.1), ${MT} (3.1))",	glu::TYPE_FLOAT,	1,	4,	glu::TYPE_INT,	{ 3 } },
		{ "length_float",		"length(2.1)",									glu::TYPE_FLOAT,	1,	1,	glu::TYPE_INT,	{ 2 } },
		{ "length_vec2",		"length(vec2(1.0))",							glu::TYPE_FLOAT,	1,	1,	glu::TYPE_INT,	{ deFloatSqrt(2.0f) } },
		{ "length_vec3",		"length(vec3(1.0))",							glu::TYPE_FLOAT,	1,	1,	glu::TYPE_INT,	{ deFloatSqrt(3.0f) } },
		{ "length_vec4",		"length(vec4(1.0))",							glu::TYPE_FLOAT,	1,	1,	glu::TYPE_INT,	{ deFloatSqrt(4.0f) } },
		{ "dot_float",			"dot(1.0, 1.0)",								glu::TYPE_FLOAT,	1,	1,	glu::TYPE_INT,	{ 1 } },
		{ "dot_vec2",			"dot(vec2(1.0), vec2(1.01))",					glu::TYPE_FLOAT,	1,	1,	glu::TYPE_INT,	{ 2 } },
		{ "dot_vec3",			"dot(vec3(1.0), vec3(1.1))",					glu::TYPE_FLOAT,	1,	1,	glu::TYPE_INT,	{ 3 } },
		{ "dot_vec4",			"dot(vec4(1.0), vec4(1.1))",					glu::TYPE_FLOAT,	1,	1,	glu::TYPE_INT,	{ 4 } },
		{ "normalize_float",	"${T} (1.0) + normalize(2.0)",					glu::TYPE_FLOAT,	1,	1,	glu::TYPE_INT,	{ 2 } },
		{ "normalize_vec2",		"${T} (1.0) + normalize(vec2(1.0)).x",			glu::TYPE_FLOAT,	1,	1,	glu::TYPE_INT,	{ 1.0f + deFloatRsq(2.0f) } },
		{ "normalize_vec3",		"${T} (1.0) + normalize(vec3(1.0)).x",			glu::TYPE_FLOAT,	1,	1,	glu::TYPE_INT,	{ 1.0f + deFloatRsq(3.0f) } },
		{ "normalize_vec4",		"${T} (1.0) + normalize(vec4(1.0)).x",			glu::TYPE_FLOAT,	1,	1,	glu::TYPE_INT,	{ 1.0f + deFloatRsq(4.0f) } },
	};

	const char* basicShaderTemplate = "const ${CASE_BASE_TYPE} cval = ${CASE_EXPRESSION};\n"
									  "out0 = cval;\n";

	std::vector<tcu::TestNode*> children;
	ShaderConstExpr::createTests(m_context, baseCases, DE_LENGTH_OF_ARRAY(baseCases), basicShaderTemplate, "basic_",
								 children);

	const char* arrayShaderTemplate = "float array[int(${CASE_EXPRESSION})];\n"
									  "out0 = array.length();\n";

	ShaderConstExpr::createTests(m_context, arrayCases, DE_LENGTH_OF_ARRAY(arrayCases), arrayShaderTemplate, "array_",
								 children);

	for (std::size_t i = 0; i < children.size(); i++)
		addChild(children[i]);
}

} // glcts