GLSLShader.cpp 15.8 KB
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/*******************************************************************************
* CGoGN: Combinatorial and Geometric modeling with Generic N-dimensional Maps  *
* version 0.1                                                                  *
* Copyright (C) 2009, IGG Team, LSIIT, University of Strasbourg                *
*                                                                              *
* This library is free software; you can redistribute it and/or modify it      *
* under the terms of the GNU Lesser General Public License as published by the *
* Free Software Foundation; either version 2.1 of the License, or (at your     *
* option) any later version.                                                   *
*                                                                              *
* This library is distributed in the hope that it will be useful, but WITHOUT  *
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or        *
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License  *
* for more details.                                                            *
*                                                                              *
* You should have received a copy of the GNU Lesser General Public License     *
* along with this library; if not, write to the Free Software Foundation,      *
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA.           *
*                                                                              *
* Web site: https://iggservis.u-strasbg.fr/CGoGN/                              *
* Contact information: cgogn@unistra.fr                                        *
*                                                                              *
*******************************************************************************/
#define EXPORTING 1

#include "Utils/GLSLShader.h"
#include <iostream>
#include <fstream>
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#include <vector>
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namespace CGoGN
{

namespace Utils
{

GLSLShader::GLSLShader()
{
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	m_vertex_shader_object = 0;
	m_fragment_shader_object = 0;
	m_geom_shader_object = 0;
	m_program_object = 0;
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}


bool GLSLShader::areGeometryShadersSupported()
{
	if ( ! glewGetExtension("GL_EXT_geometry_shader4")) return false;
	return true;
}

bool GLSLShader::areShadersSupported()
{
	if ( ! glewGetExtension("GL_ARB_vertex_shader")) return false;
	if ( ! glewGetExtension("GL_ARB_fragment_shader")) return false;
	if ( ! glewGetExtension("GL_ARB_shader_objects")) return false;
	if ( ! glewGetExtension("GL_ARB_shading_language_100")) return false;

	return true;
}


bool GLSLShader::areVBOSupported()
{
	if (!glewGetExtension("GL_ARB_vertex_buffer_object"))
		return false;
	return true;
}



char* GLSLShader::loadSourceFile(  const std::string& filename)
{
	std::ifstream	file;
	int				file_size;
	char*			shader_source;


	/*** opening file ***/
	file.open( filename.c_str() , std::ios::in | std::ios::binary );

	if( !file.good() )
	{
		std::cerr << "ERROR - GLSLShader::loadSourceFile() - unable to open the file " << filename << "." << std::endl;
		return NULL;
	}


	/*** reading file ***/
	try
	{
		/* get file size */
		file.seekg( 0, std::ios::end );
		file_size = file.tellg();
		file.seekg( 0, std::ios::beg );

		/* allocate shader source table */
		shader_source = new char [ file_size+1 ];

		/* read source file */
		file.read( shader_source, file_size );
		shader_source[ file_size ] = '\0';
	}
	catch( std::exception& io_exception )
	{
		std::cerr << "ERROR - GLSLShader::loadSourceFile() - " << io_exception.what() << std::endl;
		file.close();
		return NULL;
	}


	/*** termination ***/
	file.close();
	return shader_source;
}


bool GLSLShader::loadVertexShader(  const std::string& filename )
{
	bool	flag;
	char	*vertex_shader_source;


	vertex_shader_source = loadSourceFile( filename );

	if( !vertex_shader_source )
	{
		std::cerr << "ERROR - GLSLShader::loadVertexShader() - error occured while loading source file." << std::endl;
		return false;
	}


	flag = loadVertexShaderSourceString( vertex_shader_source );
	delete [] vertex_shader_source;


	return flag;
}


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bool GLSLShader::loadFragmentShader(const std::string& filename )
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{
	bool	flag;
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	char	*fragment_shader_source;
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	fragment_shader_source = loadSourceFile( filename );
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	if( !fragment_shader_source )
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	{
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		std::cerr << "ERROR - GLSLShader::loadFragmentShader() - error occured while loading source file." << std::endl;
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		return false;
	}


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	flag = loadFragmentShaderSourceString( fragment_shader_source );
	delete [] fragment_shader_source;
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	return flag;
}


bool GLSLShader::loadGeometryShader(const std::string& filename )
{
	bool	flag;
	char	*geom_shader_source;

	geom_shader_source = loadSourceFile( filename );



	if( !geom_shader_source )
	{
		std::cerr << "ERROR - GLSLShader::loadGeometryShader() - error occured while loading source file." << std::endl;
		return false;
	}

	flag = loadGeometryShaderSourceString( geom_shader_source );
	delete [] geom_shader_source;


	return flag;
}


bool GLSLShader::loadVertexShaderSourceString( const char *vertex_shader_source )
{
	int		status;
	char	*info_log;


	/*** create shader object ***/
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	m_vertex_shader_object = glCreateShaderObjectARB( GL_VERTEX_SHADER_ARB );
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	if( !m_vertex_shader_object )
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	{
		std::cerr << "ERROR - GLSLShader::loadVertexShader() - unable to create shader object." << std::endl;
		return false;
	}


	/*** load source file ***/
	if( !vertex_shader_source )
	{
		std::cerr << "ERROR - GLSLShader::loadVertexShader() - source string is empty." << std::endl;

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		glDeleteObjectARB( m_vertex_shader_object );
		m_vertex_shader_object = 0;
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		return false;
	}

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	glShaderSourceARB( m_vertex_shader_object, 1, (const char**)&vertex_shader_source, NULL );
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	/*** compile shader object ***/
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	glCompileShaderARB( m_vertex_shader_object );
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	glGetObjectParameterivARB( m_vertex_shader_object, GL_OBJECT_COMPILE_STATUS_ARB, &status );
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	if( !status )
	{
		std::cerr << "ERROR - GLshader::loadVertexShader() - error occured while compiling shader." << std::endl;
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		info_log = getInfoLog( m_vertex_shader_object );
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		std::cerr << "  COMPILATION " << info_log << std::endl;
		delete [] info_log;

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		glDeleteObjectARB( m_vertex_shader_object );
		m_vertex_shader_object = 0;
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		return false;
	}


	/*** termination ***/
	return true;
}


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bool GLSLShader::loadFragmentShaderSourceString( const char *fragment_shader_source )
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{
	int		status;
	char	*info_log;


	/*** create shader object ***/
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	m_fragment_shader_object = glCreateShaderObjectARB( GL_FRAGMENT_SHADER_ARB );
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	if( !m_fragment_shader_object )
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	{
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		std::cerr << "ERROR - GLSLShader::loadFragmentShader() - unable to create shader object." << std::endl;
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		return false;
	}


	/*** load source file ***/
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	if( !fragment_shader_source )
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	{
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		std::cerr << "ERROR - GLSLShader::loadFragmentShader() - source string is empty." << std::endl;
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		glDeleteObjectARB( m_fragment_shader_object );
		m_fragment_shader_object = 0;
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		return false;
	}

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	glShaderSourceARB( m_fragment_shader_object, 1, (const char**)&fragment_shader_source, NULL );
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	/*** compile shader object ***/
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	glCompileShaderARB( m_fragment_shader_object );
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	glGetObjectParameterivARB( m_fragment_shader_object, GL_OBJECT_COMPILE_STATUS_ARB, &status );
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	if( !status )
	{
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		std::cerr << "ERROR - GLshader::loadFragmentShader() - error occured while compiling shader." << std::endl;
		info_log = getInfoLog( m_fragment_shader_object );
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		std::cerr << "  COMPILATION " << info_log << std::endl;
		delete [] info_log;

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		glDeleteObjectARB( m_fragment_shader_object );
		m_fragment_shader_object = 0;
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		return false;
	}


	/*** termination ***/
	return true;
}



bool GLSLShader::loadGeometryShaderSourceString( const char *geom_shader_source )
{
	int		status;
	char	*info_log;


	/*** create shader object ***/
	// glCreateShaderObjectARB( GL_FRAGMENT_SHADER_ARB );
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	m_geom_shader_object = glCreateShader(GL_GEOMETRY_SHADER_EXT);
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	if( !m_geom_shader_object )
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	{
		std::cerr << "ERROR - GLSLShader::loadGeometryShader() - unable to create shader object." << std::endl;
		return false;
	}


	/*** load source file ***/
	if( !geom_shader_source )
	{
		std::cerr << "ERROR - GLSLShader::loadGeometryShader() - source string is empty." << std::endl;

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		glDeleteObjectARB( m_geom_shader_object );
		m_geom_shader_object = 0;
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		return false;
	}

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	glShaderSourceARB( m_geom_shader_object, 1, (const char**)&geom_shader_source, NULL );
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	/*** compile shader object ***/
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	glCompileShaderARB( m_geom_shader_object );
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	glGetObjectParameterivARB( m_geom_shader_object, GL_OBJECT_COMPILE_STATUS_ARB, &status );
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	if( !status )
	{
		std::cerr << "ERROR - GLshader::loadGeometryShader() - error occured while compiling shader." << std::endl;
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		info_log = getInfoLog( m_geom_shader_object );
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		std::cerr << "  COMPILATION " << info_log << std::endl;
		delete [] info_log;

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		glDeleteObjectARB( m_geom_shader_object );
		m_geom_shader_object = 0;
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		return false;
	}


	/*** termination ***/
	return true;
}


char* GLSLShader::getInfoLog( GLhandleARB obj )
{
	char	*info_log;
	int		info_log_length;
	int		length;


	glGetObjectParameterivARB( obj, GL_OBJECT_INFO_LOG_LENGTH_ARB, &info_log_length );

	info_log = new char [info_log_length];
	glGetInfoLogARB( obj, info_log_length, &length, info_log );


	return info_log;
}


bool GLSLShader::create(GLint inputGeometryPrimitive,GLint outputGeometryPrimitive)
{
	int		status;
	char	*info_log;


	/*** check if shaders are loaded ***/
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	if( !m_vertex_shader_object || !m_fragment_shader_object )
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	{
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		std::cerr << "ERROR - GLSLShader::create() - shaders are not defined." << std::endl;
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		return false;
	}


	/*** create program object ***/
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	m_program_object = glCreateProgramObjectARB();
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	if( !m_program_object )
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	{
		std::cerr << "ERROR - GLSLShader::create() - unable to create program object." << std::endl;
		return false;
	}


	/*** attach shaders to program object ***/
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	glAttachObjectARB( m_program_object, m_vertex_shader_object );
	glAttachObjectARB( m_program_object, m_fragment_shader_object );
	if (m_geom_shader_object)
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	{
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		glAttachObjectARB( m_program_object, m_geom_shader_object );
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		glProgramParameteriEXT(m_program_object,GL_GEOMETRY_INPUT_TYPE_EXT,inputGeometryPrimitive);
		glProgramParameteriEXT(m_program_object,GL_GEOMETRY_OUTPUT_TYPE_EXT,outputGeometryPrimitive);
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		int temp;
		glGetIntegerv(GL_MAX_GEOMETRY_OUTPUT_VERTICES_EXT,&temp);
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		glProgramParameteriEXT(m_program_object,GL_GEOMETRY_VERTICES_OUT_EXT,temp);
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	}


	/*** link program object ***/
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	glLinkProgramARB( m_program_object );
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	glGetObjectParameterivARB( m_program_object, GL_OBJECT_LINK_STATUS_ARB, &status );
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	if( !status )
	{
		std::cerr << "ERROR - GLSLShader::create() - error occured while linking shader program." << std::endl;
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		info_log = getInfoLog( m_program_object );
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		std::cerr << "  LINK " << info_log << std::endl;
		delete [] info_log;

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		glDetachObjectARB( m_program_object, m_vertex_shader_object );
		glDetachObjectARB( m_program_object, m_fragment_shader_object );
		if (m_geom_shader_object)
			glDetachObjectARB( m_program_object, m_geom_shader_object );
		glDeleteObjectARB( m_program_object );
		m_program_object = 0;
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		return false;
	}

	return true;
}


bool GLSLShader::bind()
{
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	if( m_program_object )
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	{
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		glUseProgramObjectARB( m_program_object );
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		return true;
	}
	else  return false;
}


void GLSLShader::unbind()
{
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	if( m_program_object )
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	{
		glUseProgramObjectARB( 0 );
	}
}


bool GLSLShader::isBinded()
{
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	return ( m_program_object && m_program_object == glGetHandleARB(GL_PROGRAM_OBJECT_ARB) );
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}


GLSLShader::~GLSLShader()
{
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	if( m_program_object )
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	{
		unbind();

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		if( m_vertex_shader_object )
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		{
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			glDetachObjectARB( m_program_object, m_vertex_shader_object );
			glDeleteObjectARB( m_vertex_shader_object );
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		}
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		if( m_fragment_shader_object )
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		{
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			glDetachObjectARB( m_program_object, m_fragment_shader_object );
			glDeleteObjectARB( m_fragment_shader_object );
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		}
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		if (m_geom_shader_object)
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		{
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			glDetachObjectARB( m_program_object, m_geom_shader_object );
			glDeleteObjectARB( m_geom_shader_object );
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		}

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		glDeleteObjectARB( m_program_object );
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	}
}


std::string GLSLShader::findFile(const std::string filename)
{
// cherche d'abord dans le repertoire courant
	std::ifstream file;
	file.open(filename.c_str(),std::ios::in );
	if (!file.fail())
	{
		file.close();
		return filename;
	}
	file.close();

// LA MACRO SHADERPATH contient le chemin du repertoire qui contient les fichiers textes
	std::string st(SHADERPATH);
	st.append(filename);

	std::ifstream file2; // on ne peut pas réutiliser file ????
	file2.open(st.c_str(),std::ios::in);
	if (!file2.fail())
	{
		file2.close();
		return st;
	}

	return filename;
}


bool GLSLShader::init()
{
	GLenum error = glewInit();

	if (error != GLEW_OK)
		std::cerr << "Error: " << glewGetErrorString(error) << std::endl;
	else
		std::cout << "Status: Using GLEW " << glewGetString(GLEW_VERSION) << std::endl;

	if (!areVBOSupported())
		std::cout << "VBO not supported !" << std::endl;

	if(!areShadersSupported()) {
		std::cout << "Shaders not supported !" << std::endl;
		return false;
	}
	return true; 
}

bool GLSLShader::loadShaders(const std::string& vs, const std::string& ps)
{
	std::string vss = findFile(vs);
	if(!loadVertexShader(vss)) return false;
	
	std::string pss = findFile(ps);
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	if(!loadFragmentShader(pss)) return false;
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	if(!create()) {
		std::cout << "Unable to create the shaders !" << std::endl;
		return false;
	}
	std::cout << "Shaders loaded (" << vs << "," << ps << ")" << std::endl;
	return true; 
}

bool GLSLShader::loadShaders(const std::string& vs, const std::string& ps, const std::string& gs, GLint inputGeometryPrimitive,GLint outputGeometryPrimitive)
{
	std::string vss = findFile(vs);
	if(!loadVertexShader(vss)) return false;

	std::string pss = findFile(ps);
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	if(!loadFragmentShader(pss)) return false;
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	std::string gss = findFile(gs);
	bool geomShaderLoaded = loadGeometryShader(gss);

	if (!geomShaderLoaded)
	{
		std::cerr << "Error while loading geometry shader" << std::endl;
	}


	if(!create(inputGeometryPrimitive,outputGeometryPrimitive))
	{
		std::cout << "Unable to create the shaders !" << std::endl;
		return false;
	}

	std::cout << "Shaders loaded (" << vs << "," << ps << "," << gs <<")" << std::endl;
	return true;
}

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bool GLSLShader::validateProgram()
{
	if(!m_program_object)
		return false;

	glValidateProgram(m_program_object);
	GLint Result = GL_FALSE;
	glGetProgramiv(m_program_object, GL_VALIDATE_STATUS, &Result);

	if(Result == GL_FALSE)
	{
		std::cout << "Validate program:" << std::endl;
		int InfoLogLength;
		glGetProgramiv(m_program_object, GL_INFO_LOG_LENGTH, &InfoLogLength);
		std::vector<char> Buffer(InfoLogLength);
		glGetProgramInfoLog(m_program_object, InfoLogLength, NULL, &Buffer[0]);
		std::cout <<  &(Buffer[0]) << std::endl;
		return false;
	}

	return true;
}

bool GLSLShader::checkProgram()
{
	GLint Result = GL_FALSE;
	glGetProgramiv(m_program_object, GL_LINK_STATUS, &Result);

	int InfoLogLength;
	glGetProgramiv(m_program_object, GL_INFO_LOG_LENGTH, &InfoLogLength);
	std::vector<char> Buffer(std::max(InfoLogLength, int(1)));
	glGetProgramInfoLog(m_program_object, InfoLogLength, NULL, &Buffer[0]);
	std::cout << &Buffer[0] << std::endl;

	return Result == GL_TRUE;
}

bool GLSLShader::checkShader(int shaderType)
{
	GLint Result = GL_FALSE;
	int InfoLogLength;
	GLhandleARB id;

	switch(shaderType)
	{
	case VERTEX_SHADER:
		id = m_vertex_shader_object;
		break;
	case FRAGMENT_SHADER:
		id = m_fragment_shader_object;
		break;
	case GEOMETRY_SHADER:
		id = m_geom_shader_object;
		break;
	default:
		std::cerr << "Error unkown shader type"<< std::endl;
		return false;
		break;
	}

	glGetShaderiv(id, GL_COMPILE_STATUS, &Result);
	glGetShaderiv(id, GL_INFO_LOG_LENGTH, &InfoLogLength);
	std::vector<char> Buffer(InfoLogLength);
	glGetShaderInfoLog(id, InfoLogLength, NULL, &Buffer[0]);
	std::cout << &Buffer[0] << std::endl;

	return Result == GL_TRUE;
}



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void GLSLShader::bindAttrib(unsigned int att, const char* name) const
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{
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	glBindAttribLocation(m_program_object,att,name);
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}



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} // namespace Utils
} // namespace CGoGN