external/openglcts/modules/gl/gl4cShadingLanguage420PackTests.cpp

/*-------------------------------------------------------------------------
 * OpenGL Conformance Test Suite
 * -----------------------------
 *
 * Copyright (c) 2014-2016 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
 * \brief
 */ /*-------------------------------------------------------------------*/

/**
 * \file  gl4cShadingLanguage420PackTests.cpp
 * \brief Implements conformance tests for "Shading Language 420Pack" functionality.
 */ /*-------------------------------------------------------------------*/

#include "gl4cShadingLanguage420PackTests.hpp"

#include "gluContextInfo.hpp"
#include "gluDefs.hpp"
#include "glwEnums.hpp"
#include "glwFunctions.hpp"
#include "tcuTestLog.hpp"

#include <algorithm>
#include <iomanip>
#include <stdio.h>
#include <string.h>
#include <string>
#include <vector>

#define IS_DEBUG 0

using namespace glw;

namespace gl4cts
{

namespace GLSL420Pack
{
/** Check binding of uniform
 *
 * @param program          Program object
 * @param name             Array name
 * @param expected_binding Expected binding value
 *
 * @return true if binding is as expected, false otherwise
 **/
bool Utils::checkUniformBinding(Utils::program& program, const glw::GLchar* name, glw::GLint expected_binding)
{
	const GLint uniform_location = program.getUniformLocation(name);
	if (-1 == uniform_location)
	{
		TCU_FAIL("Uniform is inactive");
	}

	GLint binding = program.getUniform1i(uniform_location);

	return (expected_binding == binding);
}
/** Check binding of uniform array element at <index>
 *
 * @param program          Program object
 * @param name             Array name
 * @param index            Index
 * @param expected_binding Expected binding value
 *
 * @return true if binding is as expected, false otherwise
 **/
bool Utils::checkUniformArrayBinding(Utils::program& program, const glw::GLchar* name, glw::GLuint index,
									 glw::GLint expected_binding)
{
	GLchar buffer[64];
	sprintf(buffer, "%s[%d]", name, index);

	const GLint uniform_location = program.getUniformLocation(buffer);
	if (-1 == uniform_location)
	{
		TCU_FAIL("Uniform is inactive");
	}

	GLint binding = program.getUniform1i(uniform_location);

	return (expected_binding == binding);
}

/** Check if given qualifier is present in set
 *
 * @param qualifier  Specific qualifier
 * @param qualifiers Qualifiers' set
 *
 * @return true if qualifier is present, false otherwise
 **/
bool Utils::doesContainQualifier(Utils::QUALIFIERS qualifier, const Utils::qualifierSet& qualifiers)
{
	for (GLuint i = 0; i < qualifiers.size(); ++i)
	{
		if (qualifiers[i] == qualifier)
		{
			return true;
		}
	}

	return false;
}

/** Check if given stage supports specific qualifier
 *
 * @param stage     Shader stage
 * @param storage   Storage of variable
 * @param qualifier Qualifier
 *
 * @return true if qualifier can be used in given stage, false otherwise
 **/
bool Utils::doesStageSupportQualifier(Utils::SHADER_STAGES stage, Utils::VARIABLE_STORAGE storage,
									  Utils::QUALIFIERS qualifier)
{
	bool result = true;

	switch (stage)
	{
	case COMPUTE_SHADER:
		switch (qualifier)
		{
		case QUAL_NONE:
		case QUAL_UNIFORM:
		case QUAL_LOWP:
		case QUAL_MEDIUMP:
		case QUAL_HIGHP:
		case QUAL_INVARIANT:
			result = true;
			break;
		default:
			result = false;
			break;
		}
		break;
	case FRAGMENT_SHADER:
		if (QUAL_PATCH == qualifier)
		{
			result = false;
		}
		else if ((OUTPUT == storage) &&
				 ((QUAL_SMOOTH == qualifier) || (QUAL_NOPERSPECTIVE == qualifier) || (QUAL_FLAT == qualifier)))
		{
			result = false;
		}
		break;
	case VERTEX_SHADER:
		if (QUAL_PATCH == qualifier)
		{
			result = false;
		}
		else if ((INPUT == storage) &&
				 ((QUAL_SMOOTH == qualifier) || (QUAL_NOPERSPECTIVE == qualifier) || (QUAL_FLAT == qualifier) ||
				  (QUAL_INVARIANT == qualifier) || (QUAL_CENTROID == qualifier) || (QUAL_SAMPLE == qualifier)))
		{
			result = false;
		}
		break;
	case GEOMETRY_SHADER:
		if (QUAL_PATCH == qualifier)
		{
			result = false;
		}
		break;
	case TESS_CTRL_SHADER:
		if ((INPUT == storage) && (QUAL_PATCH == qualifier))
		{
			result = false;
		}
		break;
	case TESS_EVAL_SHADER:
		if ((OUTPUT == storage) && (QUAL_PATCH == qualifier))
		{
			result = false;
		}
		break;
	default:
		break;
	}

	return result;
}

/** Get string for qualifier
 *
 * @param qualifier Qualifier
 *
 * @return A string for given qualifier
 **/
const GLchar* Utils::getQualifierString(Utils::QUALIFIERS qualifier)
{
	const GLchar* result = 0;
	switch (qualifier)
	{
	case QUAL_NONE:
		result = "";
		break;
	case QUAL_CONST:
		result = "const";
		break;
	case QUAL_IN:
		result = "in";
		break;
	case QUAL_OUT:
		result = "out";
		break;
	case QUAL_INOUT:
		result = "inout";
		break;
	case QUAL_UNIFORM:
		result = "uniform";
		break;
	case QUAL_PATCH:
		result = "patch";
		break;
	case QUAL_CENTROID:
		result = "centroid";
		break;
	case QUAL_SAMPLE:
		result = "sample";
		break;
	case QUAL_FLAT:
		result = "flat";
		break;
	case QUAL_NOPERSPECTIVE:
		result = "noperspective";
		break;
	case QUAL_SMOOTH:
		result = "smooth";
		break;
	case QUAL_LOCATION:
		result = "layout (location = LOC_VALUE)";
		break;
	case QUAL_LOWP:
		result = "lowp";
		break;
	case QUAL_MEDIUMP:
		result = "mediump";
		break;
	case QUAL_HIGHP:
		result = "highp";
		break;
	case QUAL_PRECISE:
		result = "precise";
		break;
	case QUAL_INVARIANT:
		result = "invariant";
		break;
	default:
		TCU_FAIL("Invalid enum");
	};

	return result;
}

/** Returns a string with set of qualifiers.
 *
 * @param qualifiers Set of qualifiers
 *
 * @return String
 **/
std::string Utils::getQualifiersListString(const qualifierSet& qualifiers)
{
	static const GLchar* qualifier_list		   = "QUALIFIER QUALIFIER_LIST";
	const GLuint		 qualifier_list_length = static_cast<GLuint>(strlen(qualifier_list));

	/* Tokens */
	static const GLchar* token_qualifier = "QUALIFIER";
	static const GLchar* token_qual_list = "QUALIFIER_LIST";

	/* Variables */
	std::string list	 = token_qual_list;
	size_t		position = 0;

	/* Replace tokens */
	for (GLuint i = 0; i < qualifiers.size(); ++i)
	{
		Utils::replaceToken(token_qual_list, position, qualifier_list, list);
		position -= qualifier_list_length;

		const GLchar* qualifier_str = getQualifierString(qualifiers[i]);

		Utils::replaceToken(token_qualifier, position, qualifier_str, list);
	}

	Utils::replaceToken(token_qual_list, position, "", list);

	return list;
}

/** Prepare a set of qualifiers for given shader stage and variable storage.
 * Filters out not supported qualifiers from in_qualifiers
 *
 * @param in_qualifiers Origiranl set of qualifiers
 * @param stage         Shader stage
 * @param storage       Variable storage
 *
 * @return Set of qualifiers
 **/
Utils::qualifierSet Utils::prepareQualifiersSet(const qualifierSet& in_qualifiers, SHADER_STAGES stage,
												VARIABLE_STORAGE storage)
{
	qualifierSet result;

	for (GLuint i = 0; i < in_qualifiers.size(); ++i)
	{
		Utils::QUALIFIERS qualifier = in_qualifiers[i];

		if (false == doesStageSupportQualifier(stage, storage, qualifier))
		{
			continue;
		};

		/* Replace wrong storage qualifiers */
		if ((Utils::INPUT == storage) && ((Utils::QUAL_UNIFORM == qualifier) || (Utils::QUAL_OUT == qualifier)))
		{
			qualifier = QUAL_IN;
		}
		else if ((Utils::OUTPUT == storage) && ((Utils::QUAL_IN == qualifier) || (Utils::QUAL_UNIFORM == qualifier)))
		{
			qualifier = QUAL_OUT;
		}
		else if ((Utils::UNIFORM == storage) && ((Utils::QUAL_IN == qualifier) || (Utils::QUAL_OUT == qualifier)))
		{
			qualifier = QUAL_UNIFORM;
		}

		result.push_back(qualifier);
	}

	return result;
}

/** Get image type for given texture type
 *
 * @param type Texture type
 *
 * @return String representing sampler type
 **/
const GLchar* Utils::getImageType(Utils::TEXTURE_TYPES type)
{
	const GLchar* result = 0;

	switch (type)
	{
	case TEX_BUFFER:
		result = "imageBuffer";
		break;
	case TEX_2D:
		result = "image2D";
		break;
	case TEX_2D_RECT:
		result = "image2DRect";
		break;
	case TEX_2D_ARRAY:
		result = "image2DArray";
		break;
	case TEX_3D:
		result = "image3D";
		break;
	case TEX_CUBE:
		result = "imageCube";
		break;
	case TEX_1D:
		result = "image1D";
		break;
	case TEX_1D_ARRAY:
		result = "image1DArray";
		break;
	default:
		TCU_FAIL("Invalid enum");
	}

	return result;
}

/** Get number of coordinates required to address texture of given type
 *
 * @param type Type of texture
 *
 * @return Number of coordinates
 **/
GLuint Utils::getNumberOfCoordinates(Utils::TEXTURE_TYPES type)
{
	GLuint result = 0;

	switch (type)
	{
	case TEX_BUFFER:
		result = 1;
		break;
	case TEX_2D:
		result = 2;
		break;
	case TEX_2D_RECT:
		result = 2;
		break;
	case TEX_2D_ARRAY:
		result = 3;
		break;
	case TEX_3D:
		result = 3;
		break;
	case TEX_CUBE:
		result = 3;
		break;
	case TEX_1D:
		result = 1;
		break;
	case TEX_1D_ARRAY:
		result = 2;
		break;
	default:
		TCU_FAIL("Invalid enum");
	}

	return result;
}

/** Get sampler type for given texture type
 *
 * @param type Texture type
 *
 * @return String representing sampler type
 **/
const GLchar* Utils::getSamplerType(Utils::TEXTURE_TYPES type)
{
	const GLchar* result = 0;

	switch (type)
	{
	case TEX_BUFFER:
		result = "samplerBuffer";
		break;
	case TEX_2D:
		result = "sampler2D";
		break;
	case TEX_2D_RECT:
		result = "sampler2DRect";
		break;
	case TEX_2D_ARRAY:
		result = "sampler2DArray";
		break;
	case TEX_3D:
		result = "sampler3D";
		break;
	case TEX_CUBE:
		result = "samplerCube";
		break;
	case TEX_1D:
		result = "sampler1D";
		break;
	case TEX_1D_ARRAY:
		result = "sampler1DArray";
		break;
	default:
		TCU_FAIL("Invalid enum");
	}

	return result;
}

/** Get target for given texture type
 *
 * @param type Type of texture
 *
 * @return Target
 **/
GLenum Utils::getTextureTartet(Utils::TEXTURE_TYPES type)
{
	GLenum result = 0;

	switch (type)
	{
	case TEX_BUFFER:
		result = GL_TEXTURE_BUFFER;
		break;
	case TEX_2D:
		result = GL_TEXTURE_2D;
		break;
	case TEX_2D_RECT:
		result = GL_TEXTURE_RECTANGLE;
		break;
	case TEX_2D_ARRAY:
		result = GL_TEXTURE_2D_ARRAY;
		break;
	case TEX_3D:
		result = GL_TEXTURE_3D;
		break;
	case TEX_CUBE:
		result = GL_TEXTURE_CUBE_MAP;
		break;
	case TEX_1D:
		result = GL_TEXTURE_1D;
		break;
	case TEX_1D_ARRAY:
		result = GL_TEXTURE_1D_ARRAY;
		break;
	default:
		TCU_FAIL("Invalid enum");
	}

	return result;
}

/** Get name of given texture type
 *
 * @param type Texture type
 *
 * @return String representing name of texture type
 **/
const GLchar* Utils::getTextureTypeName(Utils::TEXTURE_TYPES type)
{
	const GLchar* result = 0;

	switch (type)
	{
	case TEX_BUFFER:
		result = "buffer";
		break;
	case TEX_2D:
		result = "2D";
		break;
	case TEX_2D_RECT:
		result = "2D rectangle";
		break;
	case TEX_2D_ARRAY:
		result = "2D array";
		break;
	case TEX_3D:
		result = "3D";
		break;
	case TEX_CUBE:
		result = "cube";
		break;
	case TEX_1D:
		result = "1D";
		break;
	case TEX_1D_ARRAY:
		result = "1D array";
		break;
	default:
		TCU_FAIL("Invalid enum");
	}

	return result;
}

/** Check if glsl support matrices for specific basic type
 *
 * @param type Basic type
 *
 * @return true if matrices of <type> are supported, false otherwise
 **/
bool Utils::doesTypeSupportMatrix(TYPES type)
{
	bool result = false;

	switch (type)
	{
	case FLOAT:
	case DOUBLE:
		result = true;
		break;
	case INT:
	case UINT:
		result = false;
		break;
	default:
		TCU_FAIL("Invliad enum");
	}

	return result;
}

/** Get string representing name of shader stage
 *
 * @param stage Shader stage
 *
 * @return String with name of shader stage
 **/
const glw::GLchar* Utils::getShaderStageName(Utils::SHADER_STAGES stage)
{
	const GLchar* result = 0;

	switch (stage)
	{
	case COMPUTE_SHADER:
		result = "compute";
		break;
	case VERTEX_SHADER:
		result = "vertex";
		break;
	case TESS_CTRL_SHADER:
		result = "tesselation control";
		break;
	case TESS_EVAL_SHADER:
		result = "tesselation evaluation";
		break;
	case GEOMETRY_SHADER:
		result = "geomtery";
		break;
	case FRAGMENT_SHADER:
		result = "fragment";
		break;
	default:
		TCU_FAIL("Invalid enum");
	}

	return result;
}

/** Get glsl name of specified type
 *
 * @param type      Basic type
 * @param n_columns Number of columns
 * @param n_rows    Number of rows
 *
 * @return Name of glsl type
 **/
const glw::GLchar* Utils::getTypeName(TYPES type, glw::GLuint n_columns, glw::GLuint n_rows)
{
	static const GLchar* float_lut[4][4] = {
		{ "float", "vec2", "vec3", "vec4" },
		{ 0, "mat2", "mat2x3", "mat2x4" },
		{ 0, "mat3x2", "mat3", "mat3x4" },
		{ 0, "mat4x2", "mat4x3", "mat4" },
	};

	static const GLchar* double_lut[4][4] = {
		{ "double", "dvec2", "dvec3", "dvec4" },
		{ 0, "dmat2", "dmat2x3", "dmat2x4" },
		{ 0, "dmat3x2", "dmat3", "dmat3x4" },
		{ 0, "dmat4x2", "dmat4x3", "dmat4" },
	};

	static const GLchar* int_lut[4] = { "int", "ivec2", "ivec3", "ivec4" };

	static const GLchar* uint_lut[4] = { "uint", "uvec2", "uvec3", "uvec4" };

	const GLchar* result = 0;

	if ((1 > n_columns) || (1 > n_rows) || (4 < n_columns) || (4 < n_rows))
	{
		return 0;
	}

	switch (type)
	{
	case FLOAT:
		result = float_lut[n_columns - 1][n_rows - 1];
		break;
	case DOUBLE:
		result = double_lut[n_columns - 1][n_rows - 1];
		break;
	case INT:
		result = int_lut[n_rows - 1];
		break;
	case UINT:
		result = uint_lut[n_rows - 1];
		break;
	default:
		TCU_FAIL("Invliad enum");
	}

	return result;
}

/** Get proper glUniformNdv routine for vectors with specified number of rows
 *
 * @param gl     GL functions
 * @param n_rows Number of rows
 *
 * @return Function address
 **/
Utils::uniformNdv Utils::getUniformNdv(const glw::Functions& gl, glw::GLuint n_rows)
{
	uniformNdv result = 0;

	switch (n_rows)
	{
	case 1:
		result = gl.uniform1dv;
		break;
	case 2:
		result = gl.uniform2dv;
		break;
	case 3:
		result = gl.uniform3dv;
		break;
	case 4:
		result = gl.uniform4dv;
		break;
	default:
		TCU_FAIL("Invalid number of rows");
	}

	return result;
}

/** Get proper glUniformNfv routine for vectors with specified number of rows
 *
 * @param gl     GL functions
 * @param n_rows Number of rows
 *
 * @return Function address
 **/
Utils::uniformNfv Utils::getUniformNfv(const glw::Functions& gl, glw::GLuint n_rows)
{
	uniformNfv result = 0;

	switch (n_rows)
	{
	case 1:
		result = gl.uniform1fv;
		break;
	case 2:
		result = gl.uniform2fv;
		break;
	case 3:
		result = gl.uniform3fv;
		break;
	case 4:
		result = gl.uniform4fv;
		break;
	default:
		TCU_FAIL("Invalid number of rows");
	}

	return result;
}

/** Get proper glUniformNiv routine for vectors with specified number of rows
 *
 * @param gl     GL functions
 * @param n_rows Number of rows
 *
 * @return Function address
 **/
Utils::uniformNiv Utils::getUniformNiv(const glw::Functions& gl, glw::GLuint n_rows)
{
	uniformNiv result = 0;

	switch (n_rows)
	{
	case 1:
		result = gl.uniform1iv;
		break;
	case 2:
		result = gl.uniform2iv;
		break;
	case 3:
		result = gl.uniform3iv;
		break;
	case 4:
		result = gl.uniform4iv;
		break;
	default:
		TCU_FAIL("Invalid number of rows");
	}

	return result;
}

/** Get proper glUniformNuiv routine for vectors with specified number of rows
 *
 * @param gl     GL functions
 * @param n_rows Number of rows
 *
 * @return Function address
 **/
Utils::uniformNuiv Utils::getUniformNuiv(const glw::Functions& gl, glw::GLuint n_rows)
{
	uniformNuiv result = 0;

	switch (n_rows)
	{
	case 1:
		result = gl.uniform1uiv;
		break;
	case 2:
		result = gl.uniform2uiv;
		break;
	case 3:
		result = gl.uniform3uiv;
		break;
	case 4:
		result = gl.uniform4uiv;
		break;
	default:
		TCU_FAIL("Invalid number of rows");
	}

	return result;
}

/** Get proper glUniformMatrixNdv routine for matrix with specified number of columns and rows
 *
 * @param gl     GL functions
 * @param n_rows Number of rows
 *
 * @return Function address
 **/
Utils::uniformMatrixNdv Utils::getUniformMatrixNdv(const glw::Functions& gl, glw::GLuint n_columns, glw::GLuint n_rows)
{
	uniformMatrixNdv result = 0;

	switch (n_columns)
	{
	case 2:
		switch (n_rows)
		{
		case 2:
			result = gl.uniformMatrix2dv;
			break;
		case 3:
			result = gl.uniformMatrix2x3dv;
			break;
		case 4:
			result = gl.uniformMatrix2x4dv;
			break;
		default:
			TCU_FAIL("Invalid number of rows");
		}
		break;
	case 3:
		switch (n_rows)
		{
		case 2:
			result = gl.uniformMatrix3x2dv;
			break;
		case 3:
			result = gl.uniformMatrix3dv;
			break;
		case 4:
			result = gl.uniformMatrix3x4dv;
			break;
		default:
			TCU_FAIL("Invalid number of rows");
		}
		break;
	case 4:
		switch (n_rows)
		{
		case 2:
			result = gl.uniformMatrix4x2dv;
			break;
		case 3:
			result = gl.uniformMatrix4x3dv;
			break;
		case 4:
			result = gl.uniformMatrix4dv;
			break;
		default:
			TCU_FAIL("Invalid number of rows");
		}
		break;
	default:
		TCU_FAIL("Invalid number of columns");
	}

	return result;
}

/** Get proper glUniformMatrixNfv routine for vectors with specified number of columns and rows
 *
 * @param gl     GL functions
 * @param n_rows Number of rows
 *
 * @return Function address
 **/
Utils::uniformMatrixNfv Utils::getUniformMatrixNfv(const glw::Functions& gl, glw::GLuint n_columns, glw::GLuint n_rows)
{
	uniformMatrixNfv result = 0;

	switch (n_columns)
	{
	case 2:
		switch (n_rows)
		{
		case 2:
			result = gl.uniformMatrix2fv;
			break;
		case 3:
			result = gl.uniformMatrix2x3fv;
			break;
		case 4:
			result = gl.uniformMatrix2x4fv;
			break;
		default:
			TCU_FAIL("Invalid number of rows");
		}
		break;
	case 3:
		switch (n_rows)
		{
		case 2:
			result = gl.uniformMatrix3x2fv;
			break;
		case 3:
			result = gl.uniformMatrix3fv;
			break;
		case 4:
			result = gl.uniformMatrix3x4fv;
			break;
		default:
			TCU_FAIL("Invalid number of rows");
		}
		break;
	case 4:
		switch (n_rows)
		{
		case 2:
			result = gl.uniformMatrix4x2fv;
			break;
		case 3:
			result = gl.uniformMatrix4x3fv;
			break;
		case 4:
			result = gl.uniformMatrix4fv;
			break;
		default:
			TCU_FAIL("Invalid number of rows");
		}
		break;
	default:
		TCU_FAIL("Invalid number of columns");
	}

	return result;
}

/** Prepare definition of input or output block's variable
 *
 * @param qualifiers    Set of qualifiers
 * @param type_name     Name of type
 * @param variable_name Meaningful part of variable name, eg. tex_coord
 *
 * @return Definition of variable
 **/
std::string Utils::getBlockVariableDefinition(const qualifierSet& qualifiers, const glw::GLchar* type_name,
											  const glw::GLchar* variable_name)
{
	/* Templates */
	static const GLchar* def_template = "QUALIFIER_LISTTYPE VARIABLE_NAME";

	/* Tokens */
	static const GLchar* token_type			 = "TYPE";
	static const GLchar* token_variable_name = "VARIABLE_NAME";
	static const GLchar* token_qual_list	 = "QUALIFIER_LIST";

	/* Variables */
	std::string variable_definition = def_template;
	size_t		position			= 0;

	/* Get qualifiers list */
	const std::string& list = getQualifiersListString(qualifiers);

	/* Replace tokens */
	Utils::replaceToken(token_qual_list, position, list.c_str(), variable_definition);
	Utils::replaceToken(token_type, position, type_name, variable_definition);
	Utils::replaceToken(token_variable_name, position, variable_name, variable_definition);

	/* Done */
	return variable_definition;
}

/** Prepare reference to input or output variable
 *
 * @param flavour       "Flavour" of variable
 * @param variable_name Meaningful part of variable name, eg. tex_coord
 * @param block_name    Name of block
 *
 * @return Reference to variable
 **/
std::string Utils::getBlockVariableReference(VARIABLE_FLAVOUR flavour, const glw::GLchar* variable_name,
											 const glw::GLchar* block_name)
{
	/* Templates */
	static const GLchar* ref_template		= "BLOCK_NAME.VARIABLE_NAME";
	static const GLchar* array_ref_template = "BLOCK_NAME[0].VARIABLE_NAME";
	static const GLchar* tcs_ref_template   = "BLOCK_NAME[gl_InvocationID].VARIABLE_NAME";

	/* Token */
	static const GLchar* token_block_name	= "BLOCK_NAME";
	static const GLchar* token_variable_name = "VARIABLE_NAME";

	/* Variables */
	std::string variable_definition;
	size_t		position = 0;

	/* Select variable reference template */
	switch (flavour)
	{
	case BASIC:
		variable_definition = ref_template;
		break;
	case ARRAY:
		variable_definition = array_ref_template;
		break;
	case INDEXED_BY_INVOCATION_ID:
		variable_definition = tcs_ref_template;
		break;
	default:
		variable_definition = ref_template;
		break;
	}

	/* Replace tokens */
	replaceAllTokens(token_block_name, block_name, variable_definition);
	replaceToken(token_variable_name, position, variable_name, variable_definition);

	/* Done */
	return variable_definition;
}

/** Prepare definition of input or output variable
 *
 * @param flavour       "Flavour" of variable
 * @param qualifiers    Set of qualifiers
 * @param type_name     Name of type
 * @param variable_name Meaningful part of variable name, eg. tex_coord
 *
 * @return Definition of variable
 **/
std::string Utils::getVariableDefinition(VARIABLE_FLAVOUR flavour, const qualifierSet& qualifiers,
										 const glw::GLchar* type_name, const glw::GLchar* variable_name)
{
	/* Templates */
	static const GLchar* def_template		= "QUALIFIER_LISTTYPE VARIABLE_NAME";
	static const GLchar* def_array_template = "QUALIFIER_LISTTYPE VARIABLE_NAME[]";

	/* Tokens */
	static const GLchar* token_type			 = "TYPE";
	static const GLchar* token_variable_name = "VARIABLE_NAME";
	static const GLchar* token_qual_list	 = "QUALIFIER_LIST";

	/* Variables */
	std::string variable_definition;
	size_t		position = 0;

	/* Select variable definition template */
	switch (flavour)
	{
	case BASIC:
		variable_definition = def_template;
		break;
	case ARRAY:
	case INDEXED_BY_INVOCATION_ID:
		variable_definition = def_array_template;
		break;
	default:
		TCU_FAIL("Invliad enum");
		break;
	}

	/* Get qualifiers list */
	const std::string& list = getQualifiersListString(qualifiers);

	/* Replace tokens */
	replaceToken(token_qual_list, position, list.c_str(), variable_definition);
	replaceToken(token_type, position, type_name, variable_definition);
	replaceToken(token_variable_name, position, variable_name, variable_definition);

	/* Done */
	return variable_definition;
}

/** Get "flavour" of variable
 *
 * @param stage      Shader stage
 * @param storage    Storage of variable
 * @param qualifiers Set of qualifiers for variable
 *
 * @return "Flavour" of variable
 **/
Utils::VARIABLE_FLAVOUR Utils::getVariableFlavour(SHADER_STAGES stage, VARIABLE_STORAGE storage,
												  const qualifierSet& qualifiers)
{
	VARIABLE_FLAVOUR result;

	if (UNIFORM == storage)
	{
		result = BASIC;
	}
	else
	{
		switch (stage)
		{
		case Utils::GEOMETRY_SHADER:
			if (Utils::INPUT == storage)
			{
				result = ARRAY;
			}
			else /* OUTPUT */
			{
				result = BASIC;
			}
			break;
		case Utils::TESS_EVAL_SHADER:
			if ((false == Utils::doesContainQualifier(Utils::QUAL_PATCH, qualifiers)) && (Utils::INPUT == storage))
			{
				result = ARRAY;
			}
			else /* OUTPUT */
			{
				result = BASIC;
			}
			break;
		case Utils::TESS_CTRL_SHADER:
			if ((true == Utils::doesContainQualifier(Utils::QUAL_PATCH, qualifiers)) && (Utils::OUTPUT == storage))
			{
				result = BASIC;
			}
			else
			{
				result = INDEXED_BY_INVOCATION_ID;
			}
			break;
		case Utils::VERTEX_SHADER:
		case Utils::FRAGMENT_SHADER:
			result = BASIC;
			break;
		default:
			TCU_FAIL("Invliad enum");
			break;
		}
	}

	return result;
}

/** Prepare name of input or output variable
 *
 * @param stage         Shader stage
 * @param storage       Storage of variable
 * @param variable_name Meaningful part of variable name, eg. tex_coord
 *
 * @return Name of variable
 **/
std::string Utils::getVariableName(SHADER_STAGES stage, VARIABLE_STORAGE storage, const glw::GLchar* variable_name)
{
	/* Variable name template */
	static const GLchar* variable_name_template = "PRECEEDING_PREFIX_VARIABLE_NAME";

	/* Tokens */
	static const GLchar* token_preceeding	= "PRECEEDING";
	static const GLchar* token_prefix		 = "PREFIX";
	static const GLchar* token_variable_name = "VARIABLE_NAME";

	static const GLchar* prefixes[Utils::STORAGE_MAX][Utils::SHADER_STAGES_MAX][2] = {
		/* COMPUTE,					VERTEX,				TCS,				TES,				GEOMETRY,			FRAGMENT					*/
		{ { "", "" },
		  { "in", "vs" },
		  { "vs", "tcs" },
		  { "tcs", "tes" },
		  { "tes", "gs" },
		  { "gs", "fs" } }, /* INPUT	*/
		{ { "", "" },
		  { "vs", "tcs" },
		  { "tcs", "tes" },
		  { "tes", "gs" },
		  { "gs", "fs" },
		  { "fs", "out" } }, /* OUTPUT	*/
		{ { "uni", "comp" },
		  { "uni", "vs" },
		  { "uni", "tcs" },
		  { "uni", "tes" },
		  { "uni", "gs" },
		  { "uni", "fs" } } /* UNIFORM	*/
	};

	/* Variables */
	const GLchar* preceeding = prefixes[storage][stage][0];
	const GLchar* prefix	 = prefixes[storage][stage][1];
	std::string   name		 = variable_name_template;
	size_t		  position   = 0;

	/* Replace tokens */
	Utils::replaceToken(token_preceeding, position, preceeding, name);
	Utils::replaceToken(token_prefix, position, prefix, name);
	Utils::replaceToken(token_variable_name, position, variable_name, name);

	/* Done */
	return name;
}

/** Prepare reference to input or output variable
 *
 * @param flavour       "Flavour" of variable
 * @param variable_name Meaningful part of variable name, eg. tex_coord
 *
 * @return Reference to variable
 **/
std::string Utils::getVariableReference(VARIABLE_FLAVOUR flavour, const glw::GLchar* variable_name)
{
	/* Templates */
	static const GLchar* ref_template		= "VARIABLE_NAME";
	static const GLchar* array_ref_template = "VARIABLE_NAME[0]";
	static const GLchar* tcs_ref_template   = "VARIABLE_NAME[gl_InvocationID]";

	/* Token */
	static const GLchar* token_variable_name = "VARIABLE_NAME";

	/* Variables */
	std::string variable_definition;
	size_t		position = 0;

	/* Select variable reference template */
	switch (flavour)
	{
	case BASIC:
		variable_definition = ref_template;
		break;
	case ARRAY:
		variable_definition = array_ref_template;
		break;
	case INDEXED_BY_INVOCATION_ID:
		variable_definition = tcs_ref_template;
		break;
	default:
		variable_definition = ref_template;
		break;
	}

	/* Replace token */
	Utils::replaceToken(token_variable_name, position, variable_name, variable_definition);

	/* Done */
	return variable_definition;
}

/** Prepare definition and reference string for block varaible
 *
 * @param in_stage         Shader stage
 * @param in_storage       Storage of variable
 * @param in_qualifiers    Set of qualifiers
 * @param in_type_name     Type name
 * @param in_variable_name Meaningful part of variable name, like "color"
 * @param in_block_name    Name of block, like "input"
 * @param out_definition   Definition string
 * @param out_reference    Reference string
 **/
void Utils::prepareBlockVariableStrings(Utils::SHADER_STAGES in_stage, Utils::VARIABLE_STORAGE in_storage,
										const Utils::qualifierSet& in_qualifiers, const glw::GLchar* in_type_name,
										const glw::GLchar* in_variable_name, const glw::GLchar* in_block_name,
										std::string& out_definition, std::string& out_reference)
{
	VARIABLE_FLAVOUR	flavour	= getVariableFlavour(in_stage, in_storage, in_qualifiers);
	const qualifierSet& qualifiers = prepareQualifiersSet(in_qualifiers, in_stage, in_storage);
	const std::string&  name	   = getVariableName(in_stage, in_storage, in_variable_name);

	out_definition = getBlockVariableDefinition(qualifiers, in_type_name, name.c_str());
	out_reference  = getBlockVariableReference(flavour, name.c_str(), in_block_name);
}

/** Prepare definition and reference string for block varaible
 *
 * @param in_stage         Shader stage
 * @param in_storage       Storage of variable
 * @param in_qualifiers    Set of qualifiers
 * @param in_type_name     Type name
 * @param in_variable_name Meaningful part of variable name, like "color"
 * @param out_definition   Definition string
 * @param out_reference    Reference string
 **/
void Utils::prepareVariableStrings(Utils::SHADER_STAGES in_stage, Utils::VARIABLE_STORAGE in_storage,
								   const Utils::qualifierSet& in_qualifiers, const glw::GLchar* in_type_name,
								   const glw::GLchar* in_variable_name, std::string& out_definition,
								   std::string& out_reference)
{
	VARIABLE_FLAVOUR	flavour	= getVariableFlavour(in_stage, in_storage, in_qualifiers);
	const qualifierSet& qualifiers = prepareQualifiersSet(in_qualifiers, in_stage, in_storage);
	const std::string&  name	   = getVariableName(in_stage, in_storage, in_variable_name);

	out_definition = getVariableDefinition(flavour, qualifiers, in_type_name, name.c_str());
	out_reference  = getVariableReference(flavour, name.c_str());
}

/** Returns string with UTF8 character for current test case
 *
 * @return String with UTF8 character
 **/
const GLchar* Utils::getUtf8Character(Utils::UTF8_CHARACTERS character)
{
	static const unsigned char two_bytes[]		 = { 0xd7, 0x84, 0x00 };
	static const unsigned char three_bytes[]	 = { 0xe3, 0x82, 0x81, 0x00 };
	static const unsigned char four_bytes[]		 = { 0xf0, 0x93, 0x83, 0x93, 0x00 };
	static const unsigned char five_bytes[]		 = { 0xfa, 0x82, 0x82, 0x82, 0x82, 0x00 };
	static const unsigned char six_bytes[]		 = { 0xfd, 0x82, 0x82, 0x82, 0x82, 0x82, 0x00 };
	static const unsigned char redundant_bytes[] = { 0xf2, 0x80, 0x80, 0x5e, 0x00 };

	const GLchar* result = 0;

	switch (character)
	{
	case TWO_BYTES:
		result = (const GLchar*)two_bytes;
		break;
	case THREE_BYTES:
		result = (const GLchar*)three_bytes;
		break;
	case FOUR_BYTES:
		result = (const GLchar*)four_bytes;
		break;
	case FIVE_BYTES:
		result = (const GLchar*)five_bytes;
		break;
	case SIX_BYTES:
		result = (const GLchar*)six_bytes;
		break;
	case REDUNDANT_ASCII:
		result = (const GLchar*)redundant_bytes;
		break;
	case EMPTY:
		result = "";
		break;
	default:
		TCU_FAIL("Invalid enum");
	}

	return result;
}
/** Check if extension is supported
 *
 * @param context        Test context
 * @param extension_name Name of extension
 *
 * @return true if extension is supported, false otherwise
 **/
bool Utils::isExtensionSupported(deqp::Context& context, const GLchar* extension_name)
{
	const std::vector<std::string>& extensions = context.getContextInfo().getExtensions();

	if (std::find(extensions.begin(), extensions.end(), extension_name) == extensions.end())
	{
		return false;
	}

	return true;
}

/** Check if GL context meets version requirements
 *
 * @param gl             Functions
 * @param required_major Minimum required MAJOR_VERSION
 * @param required_minor Minimum required MINOR_VERSION
 *
 * @return true if GL context version is at least as requested, false otherwise
 **/
bool Utils::isGLVersionAtLeast(const glw::Functions& gl, glw::GLint required_major, glw::GLint required_minor)
{
	glw::GLint major = 0;
	glw::GLint minor = 0;

	gl.getIntegerv(GL_MAJOR_VERSION, &major);
	gl.getIntegerv(GL_MINOR_VERSION, &minor);

	GLU_EXPECT_NO_ERROR(gl.getError(), "GetIntegerv");

	if (major > required_major)
	{
		/* Major is higher than required one */
		return true;
	}
	else if (major == required_major)
	{
		if (minor >= required_minor)
		{
			/* Major is equal to required one */
			/* Minor is higher than or equal to required one */
			return true;
		}
		else
		{
			/* Major is equal to required one */
			/* Minor is lower than required one */
			return false;
		}
	}
	else
	{
		/* Major is lower than required one */
		return false;
	}
}

/** Replace first occurance of <token> with <text> in <string> starting at <search_posistion>
 *
 * @param token           Token string
 * @param search_position Position at which find will start, it is updated to position at which replaced text ends
 * @param text            String that will be used as replacement for <token>
 * @param string          String to work on
 **/
void Utils::replaceToken(const glw::GLchar* token, size_t& search_position, const glw::GLchar* text,
						 std::string& string)
{
	const size_t text_length	= strlen(text);
	const size_t token_length   = strlen(token);
	const size_t token_position = string.find(token, search_position);

	string.replace(token_position, token_length, text, text_length);

	search_position = token_position + text_length;
}

/** Replace all occurances of <token> with <text> in <string>
 *
 * @param token           Token string
 * @param text            String that will be used as replacement for <token>
 * @param string          String to work on
 **/
void Utils::replaceAllTokens(const glw::GLchar* token, const glw::GLchar* text, std::string& string)
{
	const size_t text_length  = strlen(text);
	const size_t token_length = strlen(token);

	size_t search_position = 0;

	while (1)
	{
		const size_t token_position = string.find(token, search_position);

		if (std::string::npos == token_position)
		{
			break;
		}

		search_position = token_position + text_length;

		string.replace(token_position, token_length, text, text_length);
	}
}

/** Constructor
 *
 * @param context          Test context
 * @param test_name        Test name
 * @param test_description Test description
 **/
TestBase::TestBase(deqp::Context& context, const glw::GLchar* test_name, const glw::GLchar* test_description)
	: TestCase(context, test_name, test_description)
	, m_is_compute_shader_supported(false)
	, m_is_explicit_uniform_location(false)
	, m_is_shader_language_420pack(false)
{
	/* Nothing to be done here */
}

/** Execute test
 *
 * @return tcu::TestNode::CONTINUE after executing test case, tcu::TestNode::STOP otherwise
 **/
tcu::TestNode::IterateResult TestBase::iterate()
{
	/* GL entry points */
	const glw::Functions& gl = m_context.getRenderContext().getFunctions();

	/* Check extension support and version */
	m_is_explicit_uniform_location = Utils::isExtensionSupported(m_context, "GL_ARB_explicit_uniform_location");
	m_is_shader_language_420pack   = Utils::isExtensionSupported(m_context, "GL_ARB_shading_language_420pack");
	m_is_compute_shader_supported  = Utils::isGLVersionAtLeast(gl, 4, 3);

	/* Execute test */
	bool test_result = test();

	/* Set result */
	if (true == test_result)
	{
		m_context.getTestContext().setTestResult(QP_TEST_RESULT_PASS, "Pass");
	}
	else
	{
		m_context.getTestContext().setTestResult(QP_TEST_RESULT_FAIL, "Fail");
	}

	/* Done */
	return tcu::TestNode::STOP;
}

/** Basic implementation of getShaderSourceConfig method.
 *
 * @param out_n_parts     Number of source parts used by this test case
 * @param out_use_lengths If source lengths shall be provided to compiler
 **/
void TestBase::getShaderSourceConfig(glw::GLuint& out_n_parts, bool& out_use_lengths)
{
	out_n_parts		= 1;
	out_use_lengths = false;
}

/** Basic implementation of prepareNextTestCase method.
 *
 * @param test_case_index Index of test case
 *
 * @return true if index is -1 or 0, false otherwise
 **/
bool TestBase::prepareNextTestCase(GLuint test_case_index)
{
	if (((GLuint)-1 == test_case_index) || (0 == test_case_index))
	{
		return true;
	}
	else
	{
		return false;
	}
}

/** Basic implementation of prepareUniforms method
 *
 * @param ignored
 **/
void TestBase::prepareUniforms(Utils::program& /* program */)
{
	/* Nothing to be done */
}

/** Basic implementation of testInit method
 *
 * @return true if test can be executed, false otherwise
 **/
bool TestBase::testInit()
{
	return true;
}

/** Get layout specific for given stage
 *
 * @param stage Shader stage
 *
 * @return Stage specific part
 **/
const GLchar* TestBase::getStageSpecificLayout(Utils::SHADER_STAGES stage) const
{
	static const GLchar* stage_layout_geometry = "layout(points)                           in;\n"
												 "layout(triangle_strip, max_vertices = 4) out;\n";
	static const GLchar* stage_layout_tess_ctrl = "layout(vertices = 1)                     out;\n";
	static const GLchar* stage_layout_tess_eval = "layout(isolines, point_mode)             in;\n";

	const GLchar* result = "";

	switch (stage)
	{
	case Utils::GEOMETRY_SHADER:
		result = stage_layout_geometry;
		break;
	case Utils::TESS_CTRL_SHADER:
		result = stage_layout_tess_ctrl;
		break;
	case Utils::TESS_EVAL_SHADER:
		result = stage_layout_tess_eval;
		break;
	case Utils::VERTEX_SHADER:
	case Utils::FRAGMENT_SHADER:
	default:
		break;
	}

	return result;
}

/** Get "version" string
 *
 * @param stage           Shader stage, compute shader will use 430
 * @param use_version_400 Select if 400 or 420 should be used
 *
 * @return Version string
 **/
const GLchar* TestBase::getVersionString(Utils::SHADER_STAGES stage, bool use_version_400) const
{
	static const GLchar* version_400 = "#version 400\n"
									   "#extension GL_ARB_shading_language_420pack : require\n"
									   "#extension GL_ARB_separate_shader_objects : enable";
	static const GLchar* version_420 = "#version 420";
	static const GLchar* version_430 = "#version 430";

	const GLchar* result = "";

	if (Utils::COMPUTE_SHADER == stage)
	{
		result = version_430;
	}
	else if (true == use_version_400)
	{
		result = version_400;
	}
	else
	{
		result = version_420;
	}

	return result;
}

/** Initialize shaderSource instance, reserve storage and prepare shader source
 *
 * @param in_stage           Shader stage
 * @param in_use_version_400 If version 400 or 420 should be used
 * @param out_source         Shader source instance
 **/
void TestBase::initShaderSource(Utils::SHADER_STAGES in_stage, bool in_use_version_400, Utils::shaderSource& out_source)
{
	/* Shader source configuration */
	glw::GLuint n_parts		= 0;
	bool		use_lengths = false;

	getShaderSourceConfig(n_parts, use_lengths);

	out_source.m_parts.resize(n_parts);
	out_source.m_use_lengths = use_lengths;

	/* Request child class to prepare shader sources */
	prepareShaderSource(in_stage, in_use_version_400, out_source);

	/* Prepare source lengths */
	if (true == use_lengths)
	{
		for (GLuint i = 0; i < n_parts; ++i)
		{
			out_source.m_parts[i].m_length = static_cast<glw::GLint>(out_source.m_parts[i].m_code.length());

			out_source.m_parts[i].m_code.append("This should be ignored by compiler, as source length is provided");
		}
	}
	else
	{
		for (GLuint i = 0; i < n_parts; ++i)
		{
			out_source.m_parts[i].m_length = 0;
		}
	}
}

/** Execute test
 *
 * @return true if test pass, false otherwise
 **/
bool TestBase::test()
{
	bool   result		   = true;
	GLuint test_case_index = 0;

	/* Prepare test cases */
	testInit();

	/* GL entry points */
	const glw::Functions& gl = m_context.getRenderContext().getFunctions();

	/* Tesselation patch set up */
	gl.patchParameteri(GL_PATCH_VERTICES, 1);
	GLU_EXPECT_NO_ERROR(gl.getError(), "PatchParameteri");

	while (true == prepareNextTestCase(test_case_index))
	{
		bool case_result = true;

		/* Execute drawing case */
		if (false == testDrawArray(false))
		{
			case_result = false;
		}

		if (true == m_is_shader_language_420pack)
		{
			if (false == testDrawArray(true))
			{
				case_result = false;
			}
		}

		/* Execute compute shader case */
		if (true == m_is_compute_shader_supported)
		{
			if (false == testCompute())
			{
				case_result = false;
			}
		}

		/* Log failure */
		if (false == case_result)
		{
			m_context.getTestContext().getLog() << tcu::TestLog::Message << "Test case failed."
												<< tcu::TestLog::EndMessage;

			result = false;
		}

		/* Go to next test case */
		test_case_index += 1;
	}

	/* Done */
	return result;
}

int TestBase::maxImageUniforms(Utils::SHADER_STAGES stage) const
{
	const glw::Functions& gl = m_context.getRenderContext().getFunctions();
	GLint max_image_uniforms;

	switch (stage)
	{
	case Utils::COMPUTE_SHADER:
		gl.getIntegerv(GL_MAX_COMPUTE_IMAGE_UNIFORMS, &max_image_uniforms);
		break;
	case Utils::FRAGMENT_SHADER:
		gl.getIntegerv(GL_MAX_FRAGMENT_IMAGE_UNIFORMS, &max_image_uniforms);
		break;
	case Utils::GEOMETRY_SHADER:
		gl.getIntegerv(GL_MAX_GEOMETRY_IMAGE_UNIFORMS, &max_image_uniforms);
		break;
	case Utils::TESS_CTRL_SHADER:
		gl.getIntegerv(GL_MAX_TESS_CONTROL_IMAGE_UNIFORMS, &max_image_uniforms);
		break;
	case Utils::TESS_EVAL_SHADER:
		gl.getIntegerv(GL_MAX_TESS_EVALUATION_IMAGE_UNIFORMS, &max_image_uniforms);
		break;
	case Utils::VERTEX_SHADER:
		gl.getIntegerv(GL_MAX_VERTEX_IMAGE_UNIFORMS, &max_image_uniforms);
		break;
	default:
		TCU_FAIL("Invalid enum");
		break;
	}
	return max_image_uniforms;
}

/** Constructor
 *
 * @param context          Test context
 * @param test_name        Name of test
 * @param test_description Description of test
 **/
APITestBase::APITestBase(deqp::Context& context, const glw::GLchar* test_name, const glw::GLchar* test_description)
	: TestBase(context, test_name, test_description)
{
	/* Nothing to be done here */
}

/** Execute test with compute shader
 *
 * @return true if test pass, false otherwise
 **/
bool APITestBase::testCompute()
{
	/* GL objects */
	Utils::program program(m_context);

	/* Shaders */
	Utils::shaderSource compute_shader;
	initShaderSource(Utils::COMPUTE_SHADER, false, compute_shader);

	/* Check if test support compute shaders */
	if (true == compute_shader.m_parts[0].m_code.empty())
	{
		return true;
	}

	/* Build program */
	try
	{
		program.build(compute_shader, 0 /* fragment shader */, 0 /* geometry shader */,
					  0 /* tesselation control shader */, 0 /* tesselation evaluation shader */, 0 /* vertex shader */,
					  0 /* varying names */, 0 /* n varying names */, false);
	}
	catch (Utils::shaderCompilationException& exc)
	{
		/* Something wrong with compilation, test case failed */
		tcu::MessageBuilder message = m_context.getTestContext().getLog() << tcu::TestLog::Message;

		message << "Shader compilation failed. Error message: " << exc.m_error_message;

		Utils::program::printShaderSource(exc.m_shader_source, message);

		message << tcu::TestLog::EndMessage;

		return false;
	}
	catch (Utils::programLinkageException& exc)
	{
		/* Something wrong with linking, test case failed */
		m_context.getTestContext().getLog() << tcu::TestLog::Message
											<< "Program linking failed. Error message: " << exc.m_error_message
											<< tcu::TestLog::EndMessage;
		return false;
	}

	/* Set current program */
	program.use();

	/* Return result of verification */
	return checkResults(program);
}

/** Execute test with VS, TCS, TES, GS and FS
 *
 * @param use_version_400 Select if 400 or 420 should be used
 *
 * @return true if test pass, false otherwise
 **/
bool APITestBase::testDrawArray(bool use_version_400)
{
	/* GL objects */
	Utils::program program(m_context);

	/* Shaders */
	Utils::shaderSource fragment_data;
	Utils::shaderSource geometry_data;
	Utils::shaderSource tess_ctrl_data;
	Utils::shaderSource tess_eval_data;
	Utils::shaderSource vertex_data;

	initShaderSource(Utils::FRAGMENT_SHADER, use_version_400, fragment_data);
	initShaderSource(Utils::GEOMETRY_SHADER, use_version_400, geometry_data);
	initShaderSource(Utils::TESS_CTRL_SHADER, use_version_400, tess_ctrl_data);
	initShaderSource(Utils::TESS_EVAL_SHADER, use_version_400, tess_eval_data);
	initShaderSource(Utils::VERTEX_SHADER, use_version_400, vertex_data);

	/* Build program */
	try
	{
		program.build(0 /* compute shader */, fragment_data, geometry_data, tess_ctrl_data, tess_eval_data, vertex_data,
					  0 /* varying names */, 0 /* n varying names */, false);
	}
	catch (Utils::shaderCompilationException& exc)
	{
		/* Something wrong with compilation, test case failed */
		tcu::MessageBuilder message = m_context.getTestContext().getLog() << tcu::TestLog::Message;

		message << "Shader compilation failed. Error message: " << exc.m_error_message;

		Utils::program::printShaderSource(exc.m_shader_source, message);

		message << tcu::TestLog::EndMessage;

		return false;
	}
	catch (Utils::programLinkageException& exc)
	{
		/* Something wrong with linking, test case failed */
		m_context.getTestContext().getLog() << tcu::TestLog::Message
											<< "Program linking failed. Error message: " << exc.m_error_message
											<< tcu::TestLog::EndMessage;
		return false;
	}

	/* Set current program */
	program.use();

	/* Return result of verification */
	return checkResults(program);
}

/* Constants used by GLSLTestBase */
const glw::GLenum GLSLTestBase::m_color_texture_internal_format = GL_RGBA8;
const glw::GLenum GLSLTestBase::m_color_texture_format			= GL_RGBA;
const glw::GLenum GLSLTestBase::m_color_texture_type			= GL_UNSIGNED_BYTE;
const glw::GLuint GLSLTestBase::m_color_texture_width			= 16;
const glw::GLuint GLSLTestBase::m_color_texture_height			= 16;

/** Constructor
 *
 * @param context          Test context
 * @param test_name        Test name
 * @param test_description Test description
 **/
GLSLTestBase::GLSLTestBase(deqp::Context& context, const glw::GLchar* test_name, const glw::GLchar* test_description)
	: TestBase(context, test_name, test_description)
{
	/* Nothing to be done here */
}

/** Basic implementation of prepareSourceTexture method.
 *
 * @param ignored Texture instance
 *
 * @return 0
 **/
const GLchar* GLSLTestBase::prepareSourceTexture(Utils::texture&)
{
	return 0;
}

/** Basic implementation of prepareVertexBuffer method.
 *
 * @param ignored Program instance
 * @param ignored Buffer instance
 * @param vao     VertexArray instance
 *
 * @return 0
 **/
void GLSLTestBase::prepareVertexBuffer(const Utils::program&, Utils::buffer&, Utils::vertexArray& vao)
{
	vao.generate();
	vao.bind();
}

/** Basic implementation of verifyAdditionalResults
 *
 * @return true
 **/
bool GLSLTestBase::verifyAdditionalResults() const
{
	return true;
}

/** Basic implementation of releaseResource method
 *
 * @param ignored
 **/
void GLSLTestBase::releaseResource()
{
	/* Nothing to be done */
}

/** Bind texture to first image unit and set image uniform to that unit
 *
 * @param program      Program object
 * @param texture      Texture object
 * @param uniform_name Name of image uniform
 **/
void GLSLTestBase::bindTextureToimage(Utils::program& program, Utils::texture& texture,
									  const glw::GLchar* uniform_name) const
{
	/* GL entry points */
	const glw::Functions& gl = m_context.getRenderContext().getFunctions();

	gl.bindImageTexture(0 /* unit */, texture.m_id, 0 /* level */, GL_FALSE /* layered */, 0 /* layer */, GL_WRITE_ONLY,
						GL_RGBA8);
	GLU_EXPECT_NO_ERROR(gl.getError(), "BindImageTexture");

	GLint location = program.getUniformLocation(uniform_name);
	gl.uniform1i(location, 0);
	GLU_EXPECT_NO_ERROR(gl.getError(), "Uniform1i");
}

/** Bind texture to first texture unit and set sampler uniform to that unit
 *
 * @param program      Program object
 * @param texture      Texture object
 * @param uniform_name Name of sampler uniform
 **/
void GLSLTestBase::bindTextureToSampler(Utils::program& program, Utils::texture& texture,
										const glw::GLchar* uniform_name) const
{
	/* GL entry points */
	const glw::Functions& gl = m_context.getRenderContext().getFunctions();

	gl.activeTexture(GL_TEXTURE0);
	GLU_EXPECT_NO_ERROR(gl.getError(), "ActiveTexture");

	texture.bind();

	GLint location = program.getUniformLocation(uniform_name);
	gl.uniform1i(location, 0);
	GLU_EXPECT_NO_ERROR(gl.getError(), "Uniform1i");
}

/** Check contents of texture. It is expected that it will be filled with green color
 *
 * @param color_texture Texture that will be verified
 *
 * @return true if texture is all green, false otherwise
 **/
bool GLSLTestBase::checkResults(Utils::texture& color_texture) const
{
	static const GLuint		 green_color	   = 0xff00ff00;
	const GLuint			 texture_data_size = m_color_texture_width * m_color_texture_height;
	std::vector<glw::GLuint> texture_data;

	texture_data.resize(texture_data_size);

	color_texture.get(m_color_texture_format, m_color_texture_type, &texture_data[0]);

	for (GLuint i = 0; i < texture_data_size; ++i)
	{
		if (green_color != texture_data[i])
		{
			m_context.getTestContext().getLog() << tcu::TestLog::Message << "Invalid texel: " << std::setbase(16)
												<< std::setfill('0') << std::setw(8) << texture_data[i]
												<< " at index: " << i << tcu::TestLog::EndMessage;

			return false;
		}
	}

	return verifyAdditionalResults();
}

/** Prepare framebuffer with texture used as attachment
 *
 * @param framebuffer   Framebuffer
 * @param color_texture Textue used as color attachment 0
 **/
void GLSLTestBase::prepareFramebuffer(Utils::framebuffer& framebuffer, Utils::texture& color_texture) const
{
	framebuffer.generate();

	color_texture.create(m_color_texture_width, m_color_texture_height, m_color_texture_internal_format);

	framebuffer.attachTexture(GL_COLOR_ATTACHMENT0, color_texture.m_id, m_color_texture_width, m_color_texture_height);

	framebuffer.clearColor(0.0f, 0.0f, 0.0f, 0.0f);
	framebuffer.clear(GL_COLOR_BUFFER_BIT);
}

/** Prepare texture and bind it to image uniform
 *
 * @param framebuffer   Framebuffer
 * @param color_texture Textue used as color attachment 0
 **/
void GLSLTestBase::prepareImage(Utils::program& program, Utils::texture& color_texture) const
{
	color_texture.create(m_color_texture_width, m_color_texture_height, m_color_texture_internal_format);

	bindTextureToimage(program, color_texture, "uni_image");
}

/** Execute test with compute shader
 *
 * @return true if test pass, false otherwise
 **/
bool GLSLTestBase::testCompute()
{
	/* Test Result */
	bool result = true;

	/* GL objects */
	Utils::texture color_tex(m_context);
	Utils::program program(m_context);
	Utils::texture source_tex(m_context);

	/* Shaders */
	Utils::shaderSource compute_shader;
	initShaderSource(Utils::COMPUTE_SHADER, false, compute_shader);

	/* Check if test support compute shaders */
	if (true == compute_shader.m_parts[0].m_code.empty())
	{
		return true;
	}

	/* Build program */
	try
	{
		program.build(compute_shader, 0 /* fragment shader */, 0 /* geometry shader */,
					  0 /* tesselation control shader */, 0 /* tesselation evaluation shader */, 0 /* vertex shader */,
					  0 /* varying names */, 0 /* n varying names */, false);
	}
	catch (Utils::shaderCompilationException& exc)
	{
		/* Something wrong with compilation, test case failed */
		tcu::MessageBuilder message = m_context.getTestContext().getLog() << tcu::TestLog::Message;

		message << "Shader compilation failed. Error message: " << exc.m_error_message;

		Utils::program::printShaderSource(exc.m_shader_source, message);

		message << tcu::TestLog::EndMessage;

		return false;
	}
	catch (Utils::programLinkageException& exc)
	{
		/* Something wrong with linking, test case failed */
		m_context.getTestContext().getLog() << tcu::TestLog::Message
											<< "Program linking failed. Error message: " << exc.m_error_message
											<< tcu::TestLog::EndMessage;
		return false;
	}

/* Log shaders, for debugging */
#if IS_DEBUG
	{
		tcu::MessageBuilder message = m_context.getTestContext().getLog() << tcu::TestLog::Message;

		Utils::program::printShaderSource(compute_shader, message);

		message << tcu::TestLog::EndMessage;
	}
#endif /* IS_DEBUG */

	/* Set current program */
	program.use();

	/* Prepare image unit */
	prepareImage(program, color_tex);

	/* Test specific preparation of source texture */
	const GLchar* sampler_name = prepareSourceTexture(source_tex);
	if (0 != sampler_name)
	{
		bindTextureToSampler(program, source_tex, sampler_name);
	}

	/* Set up uniforms */
	prepareUniforms(program);

	/* GL entry points */
	const glw::Functions& gl = m_context.getRenderContext().getFunctions();

	/* Draw */
	gl.dispatchCompute(m_color_texture_width, m_color_texture_height, 1);
	GLU_EXPECT_NO_ERROR(gl.getError(), "DispatchCompute");

	/* Return result of verification */
	result = checkResults(color_tex);

	/* Release extra resource for the test */
	releaseResource();

	return result;
}

/** Execute test with draw array operation
 *
 * @param use_version_400 Select if 400 or 420 should be used
 *
 * @return true if test pass, false otherwise
 **/
bool GLSLTestBase::testDrawArray(bool use_version_400)
{
	/* Test Result */
	bool result = true;

	/* GL objects */
	Utils::texture	 color_tex(m_context);
	Utils::framebuffer framebuffer(m_context);
	Utils::program	 program(m_context);
	Utils::texture	 source_tex(m_context);
	Utils::vertexArray vao(m_context);
	Utils::buffer	  vertex_buffer(m_context);

	/* Shaders */
	Utils::shaderSource fragment_data;
	Utils::shaderSource geometry_data;
	Utils::shaderSource tess_ctrl_data;
	Utils::shaderSource tess_eval_data;
	Utils::shaderSource vertex_data;

	initShaderSource(Utils::FRAGMENT_SHADER, use_version_400, fragment_data);
	initShaderSource(Utils::GEOMETRY_SHADER, use_version_400, geometry_data);
	initShaderSource(Utils::TESS_CTRL_SHADER, use_version_400, tess_ctrl_data);
	initShaderSource(Utils::TESS_EVAL_SHADER, use_version_400, tess_eval_data);
	initShaderSource(Utils::VERTEX_SHADER, use_version_400, vertex_data);

	/* Build program */
	try
	{
		program.build(0 /* compute shader */, fragment_data, geometry_data, tess_ctrl_data, tess_eval_data, vertex_data,
					  0 /* varying names */, 0 /* n varying names */, false);
	}
	catch (Utils::shaderCompilationException& exc)
	{
		/* Something wrong with compilation, test case failed */
		tcu::MessageBuilder message = m_context.getTestContext().getLog() << tcu::TestLog::Message;

		message << "Shader compilation failed. Error message: " << exc.m_error_message;

		Utils::program::printShaderSource(exc.m_shader_source, message);

		message << tcu::TestLog::EndMessage;

		return false;
	}
	catch (Utils::programLinkageException& exc)
	{
		/* Something wrong with linking, test case failed */
		m_context.getTestContext().getLog() << tcu::TestLog::Message
											<< "Program linking failed. Error message: " << exc.m_error_message
											<< tcu::TestLog::EndMessage;
		return false;
	}

/* Log shaders, for debugging */
#if IS_DEBUG
	{
		const Utils::shaderSource* data[] = { &vertex_data, &tess_ctrl_data, &tess_eval_data, &geometry_data,
											  &fragment_data };

		tcu::MessageBuilder message = m_context.getTestContext().getLog() << tcu::TestLog::Message;

		for (GLuint i = 0; i < 5; ++i)
		{
			Utils::program::printShaderSource(*data[i], message);
		}

		message << tcu::TestLog::EndMessage;
	}
#endif /* IS_DEBUG */

	/* Test specific preparation of vertex buffer and vao*/
	prepareVertexBuffer(program, vertex_buffer, vao);

	/* Set current program */
	program.use();

	/* Prepare framebuffer */
	prepareFramebuffer(framebuffer, color_tex);

	/* Test specific preparation of source texture */
	const GLchar* sampler_name = prepareSourceTexture(source_tex);
	if (0 != sampler_name)
	{
		bindTextureToSampler(program, source_tex, sampler_name);
	}

	/* Set up uniforms */
	prepareUniforms(program);

	/* GL entry points */
	const glw::Functions& gl = m_context.getRenderContext().getFunctions();

	/* Draw */
	gl.drawArrays(GL_PATCHES, 0 /* first */, 1 /* count */);
	GLU_EXPECT_NO_ERROR(gl.getError(), "DrawArrays");

	/* Return result of verification */
	result = checkResults(color_tex);

	/* Release extra resource for the test */
	releaseResource();

	return result;
}

/** Constructor
 *
 * @param context          Test context
 * @param test_name        Test name
 * @param test_description Test description
 **/
NegativeTestBase::NegativeTestBase(deqp::Context& context, const glw::GLchar* test_name,
								   const glw::GLchar* test_description)
	: TestBase(context, test_name, test_description)
{
	/* Nothing to be done here */
}

/** Execute test with compute shader
 *
 * @return true if test pass, false otherwise
 **/
bool NegativeTestBase::testCompute()
{
	/* GL objects */
	Utils::program program(m_context);

	/* Shaders */
	Utils::shaderSource conmpute_data;
	initShaderSource(Utils::COMPUTE_SHADER, false, conmpute_data);

	/* Build program */
	try
	{
		program.build(conmpute_data /* compute shader */, 0 /* fragment shader */, 0 /* geometry shader */,
					  0 /* tesselation control shader */, 0 /* tesselation evaluation shader */, 0 /* vertex shader */,
					  0 /* varying names */, 0 /* n varying names */, false);
	}
	catch (Utils::shaderCompilationException& exc)
	{
		/* Compilation failed, as expected. Verify that reason of failure is as expected */
		m_context.getTestContext().getLog() << tcu::TestLog::Message
											<< "Shader compilation error message: " << exc.m_error_message
											<< tcu::TestLog::EndMessage;
		return true;
	}
	catch (Utils::programLinkageException& exc)
	{
		/* Something wrong with linking, test case failed */
		m_context.getTestContext().getLog() << tcu::TestLog::Message
											<< "Program linking failed. Error message: " << exc.m_error_message
											<< tcu::TestLog::EndMessage;
		return true;
	}

	/* Build process succeded */
	return false;
}

/** Execute test with draw array operation
 *
 * @param use_version_400 Select if 400 or 420 should be used
 *
 * @return true if test pass, false otherwise
 **/
bool NegativeTestBase::testDrawArray(bool use_version_400)
{
	/* GL objects */
	Utils::program program(m_context);

	/* Shaders */
	Utils::shaderSource fragment_data;
	Utils::shaderSource geometry_data;
	Utils::shaderSource tess_ctrl_data;
	Utils::shaderSource tess_eval_data;
	Utils::shaderSource vertex_data;

	initShaderSource(Utils::FRAGMENT_SHADER, use_version_400, fragment_data);
	initShaderSource(Utils::GEOMETRY_SHADER, use_version_400, geometry_data);
	initShaderSource(Utils::TESS_CTRL_SHADER, use_version_400, tess_ctrl_data);
	initShaderSource(Utils::TESS_EVAL_SHADER, use_version_400, tess_eval_data);
	initShaderSource(Utils::VERTEX_SHADER, use_version_400, vertex_data);

	/* Build program */
	try
	{
		program.build(0 /* compute shader */, fragment_data, geometry_data, tess_ctrl_data, tess_eval_data, vertex_data,
					  0 /* varying names */, 0 /* n varying names */, false);
	}
	catch (Utils::shaderCompilationException& exc)
	{
		/* Compilation failed, as expected. Verify that reason of failure is as expected */
		m_context.getTestContext().getLog() << tcu::TestLog::Message
											<< "Shader compilation error message: " << exc.m_error_message
											<< tcu::TestLog::EndMessage;
		return true;
	}
	catch (Utils::programLinkageException& exc)
	{
		/* Something wrong with linking, test case failed */
		m_context.getTestContext().getLog() << tcu::TestLog::Message
											<< "Program linking failed. Error message: " << exc.m_error_message
											<< tcu::TestLog::EndMessage;
		return true;
	}

	/* Build process succeded */
	return false;
}

/* Constants used by BindingImageTest */
const GLuint BindingImageTest::m_width		 = 16;
const GLuint BindingImageTest::m_green_color = 0xff00ff00;
const GLuint BindingImageTest::m_height		 = 16;
const GLuint BindingImageTest::m_depth		 = 6;

/** Constructor
 *
 * @param context Test context
 **/
BindingImageTest::BindingImageTest(deqp::Context& context, const glw::GLchar* test_name,
								   const glw::GLchar* test_description)
	: GLSLTestBase(context, test_name, test_description)
{
	/* Nothing to be done */
}

/** Prepare buffer, filled with given color
 *
 * @param buffer Buffer object
 * @param color  Color
 **/
void BindingImageTest::prepareBuffer(Utils::buffer& buffer, GLuint color)
{
	std::vector<GLuint> texture_data;
	texture_data.resize(m_width);

	buffer.generate(GL_TEXTURE_BUFFER);

	for (GLuint i = 0; i < texture_data.size(); ++i)
	{
		texture_data[i] = color;
	}

	buffer.update(m_width * sizeof(GLuint), &texture_data[0], GL_STATIC_DRAW);
}

/** Prepare texture of given type filled with given color and bind to specified image unit
 *
 * @param texture      Texture
 * @param buffer       Buffer
 * @param texture_type Type of texture
 * @param color        Color
 **/
void BindingImageTest::prepareTexture(Utils::texture& texture, const Utils::buffer& buffer,
									  Utils::TEXTURE_TYPES texture_type, GLuint color, GLuint unit)
{
	std::vector<GLuint> texture_data;
	texture_data.resize(m_width * m_height * m_depth);

	GLboolean is_layered = GL_FALSE;

	for (GLuint i = 0; i < texture_data.size(); ++i)
	{
		texture_data[i] = color;
	}

	if (Utils::TEX_BUFFER != texture_type)
	{
		texture.create(m_width, m_height, m_depth, GL_RGBA8, texture_type);

		texture.update(m_width, m_height, m_depth, GL_RGBA, GL_UNSIGNED_BYTE, &texture_data[0]);
	}
	else
	{
		buffer.bind();

		texture.createBuffer(GL_RGBA8, buffer.m_id);
	}

	switch (texture_type)
	{
	case Utils::TEX_1D_ARRAY:
	case Utils::TEX_2D_ARRAY:
	case Utils::TEX_3D:
	case Utils::TEX_CUBE:
		is_layered = GL_TRUE;
		break;
	default:
		break;
	}

	const glw::Functions& gl = m_context.getRenderContext().getFunctions();

	gl.bindImageTexture(unit, texture.m_id, 0 /* level */, is_layered /* layered */, 0 /* layer */, GL_READ_WRITE,
						GL_RGBA8);
	GLU_EXPECT_NO_ERROR(gl.getError(), "BindImageTexture");
}

/** Verifies that texel at offset 0 is green
 *
 * @param buffer Buffer object
 *
 * @return true if texel at offset 0 is green, false otherwise
 **/
bool BindingImageTest::verifyBuffer(const Utils::buffer& buffer) const
{
	GLuint* data = (GLuint*)buffer.map(GL_READ_ONLY);

	GLuint color = data[0];

	buffer.unmap();

	return (m_green_color == color);
}

/** Verifies that texel at offset 0 is green
 *
 * @param buffer Buffer object
 *
 * @return true if texel at offset 0 is green, false otherwise
 **/
bool BindingImageTest::verifyTexture(const Utils::texture& texture) const
{
	static const GLuint texture_data_size = m_width * m_height * m_depth;

	std::vector<glw::GLuint> texture_data;
	texture_data.resize(texture_data_size);

	texture.get(GL_RGBA, GL_UNSIGNED_BYTE, &texture_data[0]);

	GLuint color = texture_data[0];

	return (m_green_color == color);
}

/* Constants used by LineContinuationTest */
const GLuint  LineContinuationTest::m_n_repetitions			   = 20;
const GLchar* LineContinuationTest::m_texture_coordinates_name = "texture_coordinates";

/** Constructor
 *
 * @param context Test context
 **/
LineContinuationTest::LineContinuationTest(deqp::Context& context) : GLSLTestBase(context, "line_continuation", "desc")
{
	/* Nothing to be done here */
}

/** Overwrite getShaderSourceConfig method
 *
 * @param out_n_parts     Number of source parts used by this test case
 * @param out_use_lengths If source lengths shall be provided to compiler
 **/
void LineContinuationTest::getShaderSourceConfig(GLuint& out_n_parts, bool& out_use_lengths)
{
	out_n_parts		= (true == isShaderMultipart()) ? 2 : 1;
	out_use_lengths = useSourceLengths();
}

/** Set up next test case
 *
 * @param test_case_index Index of next test case
 *
 * @return false if there is no more test cases, true otherwise
 **/
bool LineContinuationTest::prepareNextTestCase(glw::GLuint test_case_index)
{
	static const testCase test_cases[] = { { ASSIGNMENT_BEFORE_OPERATOR, ONCE, UNIX },
										   { ASSIGNMENT_BEFORE_OPERATOR, ONCE, DOS },
										   { ASSIGNMENT_BEFORE_OPERATOR, MULTIPLE_TIMES, UNIX },
										   { ASSIGNMENT_BEFORE_OPERATOR, MULTIPLE_TIMES, DOS },
										   { ASSIGNMENT_AFTER_OPERATOR, ONCE, UNIX },
										   { ASSIGNMENT_AFTER_OPERATOR, ONCE, DOS },
										   { ASSIGNMENT_AFTER_OPERATOR, MULTIPLE_TIMES, UNIX },
										   { ASSIGNMENT_AFTER_OPERATOR, MULTIPLE_TIMES, DOS },
										   { VECTOR_VARIABLE_INITIALIZER, ONCE, UNIX },
										   { VECTOR_VARIABLE_INITIALIZER, ONCE, DOS },
										   { VECTOR_VARIABLE_INITIALIZER, MULTIPLE_TIMES, UNIX },
										   { VECTOR_VARIABLE_INITIALIZER, MULTIPLE_TIMES, DOS },
										   { TOKEN_INSIDE_FUNCTION_NAME, ONCE, UNIX },
										   { TOKEN_INSIDE_FUNCTION_NAME, ONCE, DOS },
										   { TOKEN_INSIDE_FUNCTION_NAME, MULTIPLE_TIMES, UNIX },
										   { TOKEN_INSIDE_FUNCTION_NAME, MULTIPLE_TIMES, DOS },
										   { TOKEN_INSIDE_TYPE_NAME, ONCE, UNIX },
										   { TOKEN_INSIDE_TYPE_NAME, ONCE, DOS },
										   { TOKEN_INSIDE_TYPE_NAME, MULTIPLE_TIMES, UNIX },
										   { TOKEN_INSIDE_TYPE_NAME, MULTIPLE_TIMES, DOS },
										   { TOKEN_INSIDE_VARIABLE_NAME, ONCE, UNIX },
										   { TOKEN_INSIDE_VARIABLE_NAME, ONCE, DOS },
										   { TOKEN_INSIDE_VARIABLE_NAME, MULTIPLE_TIMES, UNIX },
										   { TOKEN_INSIDE_VARIABLE_NAME, MULTIPLE_TIMES, DOS },
										   { PREPROCESSOR_TOKEN_INSIDE, ONCE, UNIX },
										   { PREPROCESSOR_TOKEN_INSIDE, ONCE, DOS },
										   { PREPROCESSOR_TOKEN_INSIDE, MULTIPLE_TIMES, UNIX },
										   { PREPROCESSOR_TOKEN_INSIDE, MULTIPLE_TIMES, DOS },
										   { PREPROCESSOR_TOKEN_BETWEEN, ONCE, UNIX },
										   { PREPROCESSOR_TOKEN_BETWEEN, ONCE, DOS },
										   { PREPROCESSOR_TOKEN_BETWEEN, MULTIPLE_TIMES, UNIX },
										   { PREPROCESSOR_TOKEN_BETWEEN, MULTIPLE_TIMES, DOS },
										   { COMMENT, ONCE, UNIX },
										   { COMMENT, ONCE, DOS },
										   { COMMENT, MULTIPLE_TIMES, UNIX },
										   { COMMENT, MULTIPLE_TIMES, DOS },
										   { SOURCE_TERMINATION_NULL, ONCE, UNIX },
										   { SOURCE_TERMINATION_NULL, ONCE, DOS },
										   { SOURCE_TERMINATION_NULL, MULTIPLE_TIMES, UNIX },
										   { SOURCE_TERMINATION_NULL, MULTIPLE_TIMES, DOS },
										   { SOURCE_TERMINATION_NON_NULL, ONCE, UNIX },
										   { SOURCE_TERMINATION_NON_NULL, ONCE, DOS },
										   { SOURCE_TERMINATION_NON_NULL, MULTIPLE_TIMES, UNIX },
										   { SOURCE_TERMINATION_NON_NULL, MULTIPLE_TIMES, DOS },
										   { PART_TERMINATION_NULL, ONCE, UNIX },
										   { PART_TERMINATION_NULL, ONCE, DOS },
										   { PART_TERMINATION_NULL, MULTIPLE_TIMES, UNIX },
										   { PART_TERMINATION_NULL, MULTIPLE_TIMES, DOS },
										   { PART_NEXT_TO_TERMINATION_NULL, ONCE, UNIX },
										   { PART_NEXT_TO_TERMINATION_NULL, ONCE, DOS },
										   { PART_NEXT_TO_TERMINATION_NULL, MULTIPLE_TIMES, UNIX },
										   { PART_NEXT_TO_TERMINATION_NULL, MULTIPLE_TIMES, DOS },
										   { PART_TERMINATION_NON_NULL, ONCE, UNIX },
										   { PART_TERMINATION_NON_NULL, ONCE, DOS },
										   { PART_TERMINATION_NON_NULL, MULTIPLE_TIMES, UNIX },
										   { PART_TERMINATION_NON_NULL, MULTIPLE_TIMES, DOS },
										   { PART_NEXT_TO_TERMINATION_NON_NULL, ONCE, UNIX },
										   { PART_NEXT_TO_TERMINATION_NON_NULL, ONCE, DOS },
										   { PART_NEXT_TO_TERMINATION_NON_NULL, MULTIPLE_TIMES, UNIX },
										   { PART_NEXT_TO_TERMINATION_NON_NULL, MULTIPLE_TIMES, DOS } };

	static const GLuint max_test_cases = sizeof(test_cases) / sizeof(testCase);

	if ((GLuint)-1 == test_case_index)
	{
		m_test_case.m_case = DEBUG_CASE;
	}
	else if (max_test_cases <= test_case_index)
	{
		return false;
	}
	else
	{
		m_test_case = test_cases[test_case_index];
	}

	m_context.getTestContext().getLog() << tcu::TestLog::Message
										<< "Test case: " << repetitionsToStr((REPETITIONS)m_test_case.m_repetitions)
										<< " line continuation, with "
										<< lineEndingsToStr((LINE_ENDINGS)m_test_case.m_line_endings)
										<< " line endings, is placed " << casesToStr((CASES)m_test_case.m_case)
										<< tcu::TestLog::EndMessage;

	return true;
}

/** Prepare source for given shader stage
 *
 * @param in_stage           Shader stage, compute shader will use 430
 * @param in_use_version_400 Select if 400 or 420 should be used
 * @param out_source         Prepared shader source instance
 **/
void LineContinuationTest::prepareShaderSource(Utils::SHADER_STAGES in_stage, bool in_use_version_400,
											   Utils::shaderSource& out_source)
{
	if (Utils::COMPUTE_SHADER == in_stage)
	{
		prepareComputShaderSource(out_source);
	}
	else
	{
		prepareShaderSourceForDraw(in_stage, in_use_version_400, out_source);
	}
}

/** Prepare compute shader source
 *
 * @param source Result shader source
 **/
void LineContinuationTest::prepareComputShaderSource(Utils::shaderSource& source)
{
	static const GLchar* shader_template_part_0 =
		"#version 430\n"
		"\n"
		"// Lorem ipsum dolor sit amCOMMENT_CASEet, consectetur adipiscing elit posuere.\n"
		"\n"
		"layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;\n"
		"\n"
		"/* Lorem ipsum dolor sit amet, conCOMMENT_CASEsectetur adipiscing elit posuere. */\n"
		"\n"
		"writeonly uniform image2D   uni_image;\n"
		"          uniform sampler2D uni_sampler;\n"
		"\n"
		"void funFUNCTION_CASEction(in veTYPE_CASEc4 in_vVARIABLE_CASEalue)\n"
		"{\n"
		"    imageStore(uni_image, ivec2(gl_GlobalInvocationID.xy), inVARIABLE_CASE_value);\n"
		"}\n"
		"\n"
		"#define SET_PREPROCESSOR_INSIDE_CASERESULT(XX) "
		"PREPROCESSOR_BETWEEN_CASEfuncFUNCTION_CASEtion(XPREPROCESSOR_INSIDE_CASEX)\n"
		"NEXT_TO_TERMINATION_CASE\nTERMINATION_CASE";

	static const GLchar* shader_template_part_1 =
		"void main()\n"
		"{\n"
		"    ivec2 coordinates   ASSIGNMENT_BEFORE_OPERATOR_CASE=ASSIGNMENT_AFTER_OPERATOR_CASE "
		"ivec2(gl_GlobalInvocationID.xy + ivec2(16, 16));\n"
		"    vec4 sampled_color = texelFetch(uni_sampler, coordinates, 0 /* lod */);\n"
		"    vec4 result        = vec4(0, 0VECTOR_VARIABLE_INITIALIZER_CASE, 0, 1);\n"
		"\n"
		"    if (vec4(0, 0, 1, 1) == sampled_color)\n"
		"    {\n"
		"        result = vecTYPE_CASE4(VECTOR_VARIABLE_INITIALIZER_CASE0, 1, 0, 1);\n"
		"    }\n"
		"    else\n"
		"    {\n"
		"        result = vec4(coordinates.xy, sampled_color.rg);\n"
		"    }\n"
		"\n"
		"    SET_RESULT(result);"
		"}\n";

	/* Init strings with templates and replace all CASE tokens */
	if (true == isShaderMultipart())
	{
		source.m_parts[0].m_code = shader_template_part_0;
		source.m_parts[1].m_code = shader_template_part_1;

		replaceAllCaseTokens(source.m_parts[0].m_code);
		replaceAllCaseTokens(source.m_parts[1].m_code);
	}
	else
	{
		source.m_parts[0].m_code = shader_template_part_0;
		source.m_parts[0].m_code.append(shader_template_part_1);

		replaceAllCaseTokens(source.m_parts[0].m_code);
	}
}

/** Prepare source for given shader stage
 *
 * @param stage           Shader stage, compute shader will use 430
 * @param use_version_400 Select if 400 or 420 should be used
 * @param source          Result shader sources
 **/
void LineContinuationTest::prepareShaderSourceForDraw(Utils::SHADER_STAGES stage, bool use_version_400,
													  Utils::shaderSource& source)
{
	/* Templates */
	static const GLchar* shader_template_part_0 =
		"VERSION\n"
		"\n"
		"// Lorem ipsum dolor sit amCOMMENT_CASEet, consectetur adipiscing elit posuere.\n"
		"\n"
		"STAGE_SPECIFIC\n"
		"\n"
		"/* Lorem ipsum dolor sit amet, conCOMMENT_CASEsectetur adipiscing elit posuere. */\n"
		"\n"
		"IN_COLOR_DEFINITION\n"
		"IN_TEXTURE_COORDINATES_DEFINITION\n"
		"OUT_COLOR_DEFINITION\n"
		"OUT_TEXTURE_COORDINATES_DEFINITION\n"
		"uniform sampler2D uni_sampler;\n"
		"\n"
		"void funFUNCTION_CASEction(in veTYPE_CASEc4 in_vVARIABLE_CASEalue)\n"
		"{\n"
		"    OUT_COLOR ASSIGNMENT_BEFORE_OPERATOR_CASE=ASSIGNMENT_AFTER_OPERATOR_CASE inVARIABLE_CASE_value;\n"
		"}\n"
		"\n"
		"#define SET_PREPROCESSOR_INSIDE_CASERESULT(XX) "
		"PREPROCESSOR_BETWEEN_CASEfuncFUNCTION_CASEtion(XPREPROCESSOR_INSIDE_CASEX)\n"
		"NEXT_TO_TERMINATION_CASE\nTERMINATION_CASE";

	static const GLchar* shader_template_part_1 =
		"void main()\n"
		"{\n"
		"    vec2 coordinates   = TEXTURE_COORDINATES;\n"
		"    vec4 sampled_color = texture(uni_sampler, coordinates);\n"
		"    vec4 result        = vec4(0, 0VECTOR_VARIABLE_INITIALIZER_CASE, 0, 1);\n"
		"\n"
		"    if (PASS_CONDITION)\n"
		"    {\n"
		"        result = vecTYPE_CASE4(VECTOR_VARIABLE_INITIALIZER_CASE0, 1, 0, 1);\n"
		"    }\n"
		"    else\n"
		"    {\n"
		"        result = vec4(coordinates.xy, sampled_color.rg);\n"
		"    }\n"
		"\n"
		"STORE_RESULTS"
		"}\n"
		"NEXT_TO_TERMINATION_CASE\nTERMINATION_CASE";

	static const GLchar* store_results_template = "    SET_RESULT(result);\n"
												  "    TEXTURE_COORDINATES = coordinates;\n";

	static const GLchar* store_results_tcs_template = "    SET_RESULT(result);\n"
													  "    TEXTURE_COORDINATES = coordinates;\n"
													  "    gl_TessLevelOuter[0] = 1.0;\n"
													  "    gl_TessLevelOuter[1] = 1.0;\n"
													  "    gl_TessLevelOuter[2] = 1.0;\n"
													  "    gl_TessLevelOuter[3] = 1.0;\n"
													  "    gl_TessLevelInner[0] = 1.0;\n"
													  "    gl_TessLevelInner[1] = 1.0;\n";

	static const GLchar* store_results_fs_template = "    SET_RESULT(result);\n";

	static const GLchar* store_results_gs_template = "    gl_Position = vec4(-1, -1, 0, 1);\n"
													 "    SET_RESULT(result);\n"
													 "    TEXTURE_COORDINATES = coordinates + vec2(-0.25, -0.25);\n"
													 "    EmitVertex();\n"
													 "    gl_Position = vec4(-1, 1, 0, 1);\n"
													 "    SET_RESULT(result);\n"
													 "    TEXTURE_COORDINATES = coordinates + vec2(-0.25, 0.25);\n"
													 "    EmitVertex();\n"
													 "    gl_Position = vec4(1, -1, 0, 1);\n"
													 "    SET_RESULT(result);\n"
													 "    TEXTURE_COORDINATES = coordinates + vec2(0.25, -0.25);\n"
													 "    EmitVertex();\n"
													 "    gl_Position = vec4(1, 1, 0, 1);\n"
													 "    SET_RESULT(result);\n"
													 "    TEXTURE_COORDINATES = coordinates + vec2(0.25, 0.25);\n"
													 "    EmitVertex();\n";

	static const GLchar* pass_condition_template = "(EXPECTED_VALUE == sampled_color) &&\n"
												   "        (vec4(0, 1, 0, 1) == IN_COLOR) ";

	static const GLchar* pass_condition_vs_template = "EXPECTED_VALUE == sampled_color";

	/* Tokens to be replaced with GLSL stuff */
	static const GLchar* token_version		  = "VERSION";
	static const GLchar* token_stage_specific = "STAGE_SPECIFIC";

	static const GLchar* token_in_color_definition		= "IN_COLOR_DEFINITION";
	static const GLchar* token_in_tex_coord_definition  = "IN_TEXTURE_COORDINATES_DEFINITION";
	static const GLchar* token_out_color_definition		= "OUT_COLOR_DEFINITION";
	static const GLchar* token_out_tex_coord_definition = "OUT_TEXTURE_COORDINATES_DEFINITION";

	static const GLchar* token_expected_value	  = "EXPECTED_VALUE";
	static const GLchar* token_texture_coordinates = "TEXTURE_COORDINATES";
	static const GLchar* token_in_color			   = "IN_COLOR";
	static const GLchar* token_out_color		   = "OUT_COLOR";

	static const GLchar* token_store_results  = "STORE_RESULTS";
	static const GLchar* token_pass_condition = "PASS_CONDITION";

	/* Name of variable and empty string*/
	static const GLchar* color_name = "color";
	static const GLchar* empty		= "";

	/* GLSL stuff */
	const GLchar* version				= getVersionString(stage, use_version_400);
	const GLchar* stage_specific_layout = getStageSpecificLayout(stage);
	const GLchar* expected_value		= getExpectedValueString();

	/* Qualifiers */
	Utils::qualifierSet in;
	Utils::qualifierSet out;
	in.push_back(Utils::QUAL_IN);
	out.push_back(Utils::QUAL_OUT);

	/* In/Out variables definitions and references */
	std::string in_tex_coord_reference;
	std::string out_tex_coord_reference;
	std::string in_color_reference;
	std::string out_color_reference;
	std::string in_tex_coord_definition;
	std::string out_tex_coord_definition;
	std::string in_color_definition;
	std::string out_color_definition;

	Utils::prepareVariableStrings(stage, Utils::INPUT, in, "vec2", m_texture_coordinates_name, in_tex_coord_definition,
								  in_tex_coord_reference);
	Utils::prepareVariableStrings(stage, Utils::OUTPUT, out, "vec2", m_texture_coordinates_name,
								  out_tex_coord_definition, out_tex_coord_reference);
	Utils::prepareVariableStrings(stage, Utils::INPUT, in, "vec4", color_name, in_color_definition, in_color_reference);
	Utils::prepareVariableStrings(stage, Utils::OUTPUT, out, "vec4", color_name, out_color_definition,
								  out_color_reference);

	in_tex_coord_definition.append(";");
	out_tex_coord_definition.append(";");
	in_color_definition.append(";");
	out_color_definition.append(";");

	/* Select pass condition and store results tempaltes */
	const GLchar* store_results  = store_results_template;
	const GLchar* pass_condition = pass_condition_template;

	switch (stage)
	{
	case Utils::FRAGMENT_SHADER:
		store_results = store_results_fs_template;
		break;
	case Utils::GEOMETRY_SHADER:
		store_results = store_results_gs_template;
		break;
	case Utils::TESS_CTRL_SHADER:
		store_results = store_results_tcs_template;
		break;
	case Utils::VERTEX_SHADER:
		pass_condition = pass_condition_vs_template;
		break;
	default:
		break;
	};
	const GLuint store_results_length  = static_cast<GLuint>(strlen(store_results));
	const GLuint pass_condition_length = static_cast<GLuint>(strlen(pass_condition));

	/* Init strings with templates and replace all CASE tokens */
	if (true == isShaderMultipart())
	{
		source.m_parts[0].m_code = shader_template_part_0;
		source.m_parts[1].m_code = shader_template_part_1;

		replaceAllCaseTokens(source.m_parts[0].m_code);
		replaceAllCaseTokens(source.m_parts[1].m_code);
	}
	else
	{
		source.m_parts[0].m_code = shader_template_part_0;
		source.m_parts[0].m_code.append(shader_template_part_1);

		replaceAllCaseTokens(source.m_parts[0].m_code);
	}

	/* Get memory for shader source parts */
	const bool   is_multipart		  = isShaderMultipart();
	size_t		 position			  = 0;
	std::string& shader_source_part_0 = source.m_parts[0].m_code;
	std::string& shader_source_part_1 = (true == is_multipart) ? source.m_parts[1].m_code : source.m_parts[0].m_code;

	/* Replace tokens */
	/* Part 0 */
	Utils::replaceToken(token_version, position, version, shader_source_part_0);

	Utils::replaceToken(token_stage_specific, position, stage_specific_layout, shader_source_part_0);

	if (Utils::VERTEX_SHADER != stage)
	{
		Utils::replaceToken(token_in_color_definition, position, in_color_definition.c_str(), shader_source_part_0);
	}
	else
	{
		Utils::replaceToken(token_in_color_definition, position, empty, shader_source_part_0);
	}
	Utils::replaceToken(token_in_tex_coord_definition, position, in_tex_coord_definition.c_str(), shader_source_part_0);
	Utils::replaceToken(token_out_color_definition, position, out_color_definition.c_str(), shader_source_part_0);
	if (Utils::FRAGMENT_SHADER == stage)
	{
		Utils::replaceToken(token_out_tex_coord_definition, position, empty, shader_source_part_0);
	}
	else
	{
		Utils::replaceToken(token_out_tex_coord_definition, position, out_tex_coord_definition.c_str(),
							shader_source_part_0);
	}

	Utils::replaceToken(token_out_color, position, out_color_reference.c_str(), shader_source_part_0);

	/* Part 1 */
	if (true == is_multipart)
	{
		position = 0;
	}

	Utils::replaceToken(token_texture_coordinates, position, in_tex_coord_reference.c_str(), shader_source_part_1);

	Utils::replaceToken(token_pass_condition, position, pass_condition, shader_source_part_1);
	position -= pass_condition_length;

	Utils::replaceToken(token_expected_value, position, expected_value, shader_source_part_1);
	if (Utils::VERTEX_SHADER != stage)
	{
		Utils::replaceToken(token_in_color, position, in_color_reference.c_str(), shader_source_part_1);
	}

	Utils::replaceToken(token_store_results, position, store_results, shader_source_part_1);
	position -= store_results_length;

	if (Utils::GEOMETRY_SHADER == stage)
	{
		for (GLuint i = 0; i < 4; ++i)
		{
			Utils::replaceToken(token_texture_coordinates, position, out_tex_coord_reference.c_str(),
								shader_source_part_1);
		}
	}
	else if (Utils::FRAGMENT_SHADER == stage)
	{
		/* Nothing to be done */
	}
	else
	{
		Utils::replaceToken(token_texture_coordinates, position, out_tex_coord_reference.c_str(), shader_source_part_1);
	}
}

/** Prepare texture
 *
 * @param texture Texutre to be created and filled with content
 *
 * @return Name of sampler uniform that should be used for the texture
 **/
const GLchar* LineContinuationTest::prepareSourceTexture(Utils::texture& texture)
{
	std::vector<GLuint> data;
	static const GLuint width	  = 64;
	static const GLuint height	 = 64;
	static const GLuint data_size  = width * height;
	static const GLuint blue_color = 0xffff0000;
	static const GLuint grey_color = 0xaaaaaaaa;

	data.resize(data_size);

	for (GLuint i = 0; i < data_size; ++i)
	{
		data[i] = grey_color;
	}

	for (GLuint y = 16; y < 48; ++y)
	{
		const GLuint line_offset = y * 64;

		for (GLuint x = 16; x < 48; ++x)
		{
			const GLuint pixel_offset = x + line_offset;

			data[pixel_offset] = blue_color;
		}
	}

	texture.create(width, height, GL_RGBA8);

	texture.update(width, height, 0 /* depth */, GL_RGBA, GL_UNSIGNED_BYTE, &data[0]);

	return "uni_sampler";
}

/** Prepare vertex buffer, vec2 tex_coord
 *
 * @param program Program object
 * @param buffer  Vertex buffer
 * @param vao     Vertex array object
 **/
void LineContinuationTest::prepareVertexBuffer(const Utils::program& program, Utils::buffer& buffer,
											   Utils::vertexArray& vao)
{
	std::string tex_coord_name = Utils::getVariableName(Utils::VERTEX_SHADER, Utils::INPUT, m_texture_coordinates_name);
	GLint		tex_coord_loc  = program.getAttribLocation(tex_coord_name.c_str());

	if (-1 == tex_coord_loc)
	{
		TCU_FAIL("Vertex attribute location is invalid");
	}

	vao.generate();
	vao.bind();

	buffer.generate(GL_ARRAY_BUFFER);

	GLfloat	data[]	= { 0.5f, 0.5f, 0.5f, 0.5f };
	GLsizeiptr data_size = sizeof(data);

	buffer.update(data_size, data, GL_STATIC_DRAW);

	/* GL entry points */
	const glw::Functions& gl = m_context.getRenderContext().getFunctions();

	/* Set up vao */
	gl.vertexAttribPointer(tex_coord_loc, 2 /* size */, GL_FLOAT /* type */, GL_FALSE /* normalized*/, 0 /* stride */,
						   0 /* offset */);
	GLU_EXPECT_NO_ERROR(gl.getError(), "VertexAttribPointer");

	/* Enable attribute */
	gl.enableVertexAttribArray(tex_coord_loc);
	GLU_EXPECT_NO_ERROR(gl.getError(), "EnableVertexAttribArray");
}

/** Get string describing test cases
 *
 * @param cases Test case
 *
 * @return String describing current test case
 **/
const GLchar* LineContinuationTest::casesToStr(CASES cases) const
{
	const GLchar* result = 0;
	switch (cases)
	{
	case ASSIGNMENT_BEFORE_OPERATOR:
		result = "just before assignment operator";
		break;
	case ASSIGNMENT_AFTER_OPERATOR:
		result = "just after assignment operator";
		break;
	case VECTOR_VARIABLE_INITIALIZER:
		result = "inside vector variable initializer";
		break;
	case TOKEN_INSIDE_FUNCTION_NAME:
		result = "inside function name";
		break;
	case TOKEN_INSIDE_TYPE_NAME:
		result = "inside type name";
		break;
	case TOKEN_INSIDE_VARIABLE_NAME:
		result = "inside variable name";
		break;
	case PREPROCESSOR_TOKEN_INSIDE:
		result = "inside preprocessor token";
		break;
	case PREPROCESSOR_TOKEN_BETWEEN:
		result = "between preprocessor token";
		break;
	case COMMENT:
		result = "inside comment";
		break;
	case SOURCE_TERMINATION_NULL:
		result = "just before null terminating source";
		break;
	case SOURCE_TERMINATION_NON_NULL:
		result = "as last character in source string, without null termination";
		break;
	case PART_TERMINATION_NULL:
		result = "just before null terminating part of source";
		break;
	case PART_NEXT_TO_TERMINATION_NULL:
		result = "just before last character in part of source";
		break;
	case PART_TERMINATION_NON_NULL:
		result = "as last character in part string, without null termination";
		break;
	case PART_NEXT_TO_TERMINATION_NON_NULL:
		result = "just before last character in part string, without null termination";
		break;
	case DEBUG_CASE: /* intended fall through */
	default:
		result = "nowhere at all. This is debug!";
		break;
	}

	return result;
}

/** Get expected value, blue color as vec4
 *
 * @return blue color
 **/
const GLchar* LineContinuationTest::getExpectedValueString() const
{
	return "vec4(0, 0, 1, 1)";
}

/** Get line continuation string, single or multiple \
         *
 * @return String
 **/
std::string LineContinuationTest::getLineContinuationString() const
{
	static const GLchar line_continuation_ending_dos[]  = { '\\', 0x0d, 0x0a, 0x00 };
	static const GLchar line_continuation_ending_unix[] = { '\\', 0x0a, 0x00 };

	std::string   result;
	const GLchar* selected_string;

	if (DOS == m_test_case.m_line_endings)
	{
		selected_string = line_continuation_ending_dos;
	}
	else
	{
		selected_string = line_continuation_ending_unix;
	}

	GLuint n_repetitions = (ONCE == m_test_case.m_repetitions) ? 1 : m_n_repetitions;

	for (GLuint i = 0; i < n_repetitions; ++i)
	{
		result.append(selected_string);
	}

	return result;
}

/** Decides if shader should consist of multiple parts for the current test case
 *
 * @return true if test case requires multiple parts, false otherwise
 **/
bool LineContinuationTest::isShaderMultipart() const
{
	bool result;

	switch (m_test_case.m_case)
	{
	case ASSIGNMENT_BEFORE_OPERATOR:
	case ASSIGNMENT_AFTER_OPERATOR:
	case VECTOR_VARIABLE_INITIALIZER:
	case TOKEN_INSIDE_FUNCTION_NAME:
	case TOKEN_INSIDE_TYPE_NAME:
	case TOKEN_INSIDE_VARIABLE_NAME:
	case PREPROCESSOR_TOKEN_INSIDE:
	case PREPROCESSOR_TOKEN_BETWEEN:
	case COMMENT:
	case SOURCE_TERMINATION_NULL:
	case SOURCE_TERMINATION_NON_NULL:
	default:
		result = false;
		break;
	case PART_TERMINATION_NULL:
	case PART_NEXT_TO_TERMINATION_NULL:
	case PART_TERMINATION_NON_NULL:
	case PART_NEXT_TO_TERMINATION_NON_NULL:
		result = true;
		break;
	};

	return result;
}

/** String describing line endings
 *
 * @param line_ending Line ending enum
 *
 * @return "unix" or "dos" strings
 **/
const GLchar* LineContinuationTest::lineEndingsToStr(LINE_ENDINGS line_ending) const
{
	const GLchar* result = 0;

	if (UNIX == line_ending)
	{
		result = "unix";
	}
	else
	{
		result = "dos";
	}

	return result;
}

/** String describing number of repetitions
 *
 * @param repetitions Repetitions enum
 *
 * @return "single" or "multiple" strings
 **/
const GLchar* LineContinuationTest::repetitionsToStr(REPETITIONS repetitions) const
{
	const GLchar* result = 0;

	if (ONCE == repetitions)
	{
		result = "single";
	}
	else
	{
		result = "multiple";
	}

	return result;
}

/** Replace all CASES tokens
 *
 * @param source String with shader template
 **/
void LineContinuationTest::replaceAllCaseTokens(std::string& source) const
{

	/* Tokens to be replaced with line continuation */
	static const GLchar* token_assignment_before_operator_case = "ASSIGNMENT_BEFORE_OPERATOR_CASE";
	static const GLchar* token_assignment_after_operator_case  = "ASSIGNMENT_AFTER_OPERATOR_CASE";
	static const