#ifndef _ESEXTCGEOMETRYSHADERADJACENCY_HPP
#define _ESEXTCGEOMETRYSHADERADJACENCY_HPP
/*-------------------------------------------------------------------------
 * 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
 */ /*-------------------------------------------------------------------*/

#include "../esextcTestCaseBase.hpp"

namespace glcts
{
/* Test Implementation of "Group 2" from CTS_EXT_geometry_shader. Description follows:
 *
 * 1. Make sure that draw calls properly accept and pass the "lines with
 *    adjacency" data to a geometry shader. The geometry shader should then
 *    forward adjacent line segments into one transform feedback buffer object
 *    and actual line segments into another one.
 *
 *    Category: API;
 *              Functional Test
 *
 *    Create a program object and a fragment, geometry and vertex shader
 *    objects, as well as a buffer object and a transform feedback object.
 *
 *    The vertex shader object can be boilerplate.
 *
 *    The geometry shader should define:
 *
 *    * output vec4 variable called out_adjacent_geometry;
 *    * output vec4 variable called out_geometry;
 *
 *    It should take lines_adjacency data and emit two adjacent line segments
 *    to out_adjacent_geometry variable and one "actual" line segment to
 *    out_geometry. Since there will be two adjacent segments and only one
 *    "actual" line segment, the missing line segment should use (0, 0, 0, 0)
 *    coordinates for its start/end points.
 *
 *    The fragment shader object can have a boilerplate implementation.
 *
 *    Compile the shaders, attach them to the program object, link the program
 *    object.
 *
 *    Generate and bind a vertex array object.
 *
 *    Initialize a buffer object (A) to have enough space to hold information
 *    for 3 coordinates * 4  vertex locations * 2 (output primitive
 *    type-specific data topology). The data should describe 4 lines (including
 *    adjacency data) that - as a whole - make a rectangle from (-1, -1, 0) to
 *    (1, 1, 0). The buffer data should then be bound to an attribute, whose
 *    index corresponds to location of the input in variable. Enable the vertex
 *    attribute array for this index.
 *
 *    Initialize a buffer object (B) to have enough space to hold result
 *    adjacent data information.
 *
 *    Initialize a buffer object (C) to have enough space to hold result
 *    geometry information.
 *
 *    Configure transform feedback so that it captures aforementioned data
 *    written by geometry shader and stores:
 *
 *    * values stored into out_adjacency_geometry in buffer object B;
 *    * values stored into out_geometry in buffer object C;
 *
 *    Use separate transform feedback mode. Enable transform feedback. Enable
 *    rasterizer discard mode.
 *
 *    Finally, issue a draw call in GL_LINES_ADJACENCY_EXT mode for 8 points.
 *
 *    Map the buffer objects to client space. The test is assumed to have
 *    passed if the mapped buffer objects contain correct data.
 *
 *    NOTE: This test should verify both arrayed and indexed draw calls work
 *    correctly.
 *
 *
 * 2. Make sure that draw calls properly accept and pass the "lines with
 *    adjacency" data to a vertex shader without the adjacency information,
 *    assuming there is no geometry shader defined for the pipeline.
 *
 *    Category: API;
 *              Functional Test.
 *
 *    Create a program object and a fragment and vertex shader object, as well
 *    as a buffer object and a transform feedback object.
 *
 *    The fragment shader object can have a boilerplate implementation.
 *
 *    The vertex shader object should define a single input vec3 variable
 *    called in_vertex and a single output vec3 variable called out_vertex. It
 *    should write data from in_vertex in an unchanged form to out_vertex.
 *
 *    Compile the shaders, attach them to the program object, link the program
 *    object.
 *
 *    Bind the vertex array object.
 *
 *    Initialize a buffer object to have enough space to hold information about
 *    3-component floating point-based 32 vertices. The data should represent 4
 *    lines (including adjacency data) that - as a whole - make a rectangle
 *    from (-1, -1, 0) to (1, 1, 0). The buffer data should then be bound to an
 *    attribute, whose index corresponds to location of the input in variable.
 *    Enable the vertex attribute array for this index..
 *
 *    Initialize another buffer object to have enough space to hold information
 *    about at most 32 vertices, each consisting of 3 floating-point components.
 *    Configure transform feed-back so that it captures data written by vertex
 *    shader output variable to this buffer object. Enable transform feedback.
 *    Enable rasterizer discard mode.
 *
 *    Finally, issue a draw call in GL_LINES_ADJACENCY_EXT mode for 8 points.
 *
 *    Map the buffer object to client space. The test is assumed to have passed
 *    if the result data corresponds to locations of 8 vertices making up the
 *    rectangle *without* the adjacency data.
 *
 *
 * 3. Make sure that draw calls properly accept and pass the "line strips with
 *    adjacency" data to a geometry shader, if there is one included in the
 *    pipeline.
 *
 *    Category: API;
 *              Functional Test.
 *
 *    Modify test case 2.1 accordingly to work on "line strips with adjacency"
 *    data instead of "lines with adjacency" data.
 *
 *
 * 4. Make sure that draw calls properly accept and pass the "line strips with
 *    adjacency" data to a vertex shader without the adjacency information,
 *    assuming there is no geometry shader defined for the pipeline.
 *
 *    Category: API;
 *              Functional Test.
 *
 *    Modify test case 2.2 accordingly to work on "line strips with adjacency"
 *    data instead of "lines with adjacency" data.
 *
 *
 * 5. Make sure that draw calls properly accept and pass the "triangles with
 *    adjacency" data to a geometry shader, if there is one included in the
 *    pipeline.
 *
 *    Category: API;
 *              Functional Test.
 *
 *    Modify test case 2.1 accordingly to work on "triangles with adjacency"
 *    data instead of "lines with adjacency" data.
 *
 *
 * 6. Make sure that draw calls properly accept and pass the "triangles with
 *    adjacency" data to a vertex shader without the adjacency information,
 *    assuming there is no geometry shader defined for the pipeline.
 *
 *    Category: API;
 *              Functional Test.
 *
 *    Modify test case 2.2 accordingly to work on "triangles with adjacency"
 *    data instead of "lines with adjacency" data
 *
 *
 * 7. Make sure that draw calls properly accept and pass the "triangle strips
 *    with adjacency" data to a geometry shader, if there is one included in
 *    the pipeline.
 *
 *    Category: API;
 *              Functional Test.
 *
 *    Modify test case 2.1 accordingly to work on "triangle strips with
 *    adjacency" data instead of "lines with adjacency" data.
 *
 *
 * 8. Make sure that draw calls properly accept and pass the "triangle strips
 *    with adjacency" data to a vertex shader without the adjacency information,
 *    assuming there is no geometry shader defined for the pipeline.
 *
 *    Category: API;
 *              Functional Test.
 *
 *    Modify test case 2.2 accordingly to work on "triangle strips with
 *    adjacency" data instead of "lines with adjacency" data.
 *
 **/

/* Helper class for storing point data */
struct AdjacencyGridPoint
{
	/* Public variables */
	glw::GLuint  index;
	glw::GLfloat x;
	glw::GLfloat y;
};

/* Helper class for storing line data */
struct AdjacencyGridLineSegment
{
	/* Public variables */
	AdjacencyGridPoint* m_point_end;
	AdjacencyGridPoint* m_point_end_adjacent;
	AdjacencyGridPoint* m_point_start;
	AdjacencyGridPoint* m_point_start_adjacent;
};

/* Helper class for storing strip data */
class AdjacencyGridStrip
{
public:
	/* Public metods */
	AdjacencyGridStrip();
	virtual ~AdjacencyGridStrip();

	/* Public variables */
	glw::GLuint			m_n_points;
	AdjacencyGridPoint* m_points;
};

/* Helper class for storing triangle data */
class AdjacencyGridTriangle
{
public:
	/* Public variables */
	AdjacencyGridPoint* m_vertex_x;
	AdjacencyGridPoint* m_vertex_x_adjacent;
	AdjacencyGridPoint* m_vertex_y;
	AdjacencyGridPoint* m_vertex_y_adjacent;
	AdjacencyGridPoint* m_vertex_z;
	AdjacencyGridPoint* m_vertex_z_adjacent;
};

/* Helper class for storing grid data */
class AdjacencyGrid
{
public:
	/* Public metods */
	AdjacencyGrid(void);
	virtual ~AdjacencyGrid(void);

	/* Public variables */
	AdjacencyGridLineSegment* m_line_segments;
	AdjacencyGridStrip		  m_line_strip;
	AdjacencyGridPoint*		  m_points;
	AdjacencyGridTriangle*	m_triangles;
	AdjacencyGridStrip		  m_triangle_strip;

	glw::GLuint m_n_points;
	glw::GLuint m_n_segments;
	glw::GLuint m_n_triangles;
};

/* Helper class for storing test data */
class AdjacencyTestData
{
public:
	/* Public metods */
	AdjacencyTestData(void);
	virtual ~AdjacencyTestData(void);

	/* Public variables */
	const char*	m_gs_code;
	glw::GLenum	m_mode;
	glw::GLuint	m_n_vertices;
	AdjacencyGrid* m_grid;
	glw::GLuint	m_geometry_bo_size;
	glw::GLuint	m_index_data_bo_size;
	glw::GLuint	m_vertex_data_bo_size;
	glw::GLfloat*  m_expected_adjacency_geometry;
	glw::GLfloat*  m_expected_geometry;
	glw::GLuint*   m_index_data;
	glw::GLenum	m_tf_mode;
	glw::GLfloat*  m_vertex_data;
};

/* Test class implementation */
class GeometryShaderAdjacency : public TestCaseBase
{
public:
	/* Public methods */
	GeometryShaderAdjacency(Context& context, const ExtParameters& extParams, const char* name, const char* description,
							AdjacencyTestData& testData);

	virtual ~GeometryShaderAdjacency()
	{
	}

	virtual void		  deinit(void);
	virtual IterateResult iterate(void);

protected:
	/* Protected methods */
	void		initTest(void);
	const char* getFragmentShaderCode();
	const char* getVertexShaderCode();

private:
	/* Private variables */
	glw::GLuint		   m_adjacency_geometry_bo_id;
	glw::GLuint		   m_fs_id;
	glw::GLuint		   m_geometry_bo_id;
	glw::GLuint		   m_gs_id;
	glw::GLuint		   m_index_data_bo_id;
	glw::GLuint		   m_vertex_data_bo_id;
	glw::GLuint		   m_po_id;
	AdjacencyTestData& m_test_data;
	glw::GLuint		   m_vao_id;
	glw::GLuint		   m_vs_id;

	/* Private constants */
	glw::GLuint  m_components_input;
	glw::GLfloat m_epsilon;
	glw::GLuint  m_position_attribute_location;
};

} // namespace glcts

#endif // _ESEXTCGEOMETRYSHADERADJACENCY_HPP