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594 jab 1 
/* ----------------------------------------------------------------------- *
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 * This file is part of GEL, http://www.imm.dtu.dk/GEL
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 * Copyright (C) the authors and DTU Informatics
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 * For license and list of authors, see ../../doc/intro.pdf
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 * ----------------------------------------------------------------------- */
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#include <iostream>
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#include <fstream>
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#include <string>
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#include "../GL/glew.h"
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#include "../GLGraphics/gel_glu.h"
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using namespace std;
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namespace GLGraphics
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{
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  void print_glsl_program_log(GLuint program)
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  {
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    GLint infoLog_length = 0;
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    glGetProgramiv(program, GL_INFO_LOG_LENGTH, &infoLog_length);
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    // Some drivers return 1 as infoLog_length when the infoLog is an empty string
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    if(infoLog_length > 1)
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    {
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      char* infoLog = new char[infoLog_length];
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      glGetProgramInfoLog(program, infoLog_length, 0, infoLog);
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      cerr << "InfoLog:" << endl << infoLog << endl << endl;
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      delete [] infoLog;
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    }
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  }
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502 jrf 31 
  void print_glsl_shader_log(GLuint shader)
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  {
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    GLint infoLog_length = 0;
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    glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &infoLog_length);
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    // Some drivers return 1 as infoLog_length when the infoLog is an empty string
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    if(infoLog_length > 1)
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    {
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      char* infoLog = new char[infoLog_length];
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      glGetShaderInfoLog(shader, infoLog_length, 0, infoLog);
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      cerr << "InfoLog:" << endl << infoLog << endl << endl;
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      delete [] infoLog;
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    }
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  }
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  bool check_glsl_shader(GLuint shader)
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  {
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    GLint status;
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    glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
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    return status == GL_TRUE;
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  }
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  const std::string read_glsl_source(const std::string& path, const std::string& file)
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  {
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    string fullpath = path + "/" + file;
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    ifstream is(fullpath.c_str(), ios::binary);
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    string str, contents;
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    while(getline(is,str))
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    {
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      contents += str;
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      contents += "\n";
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    }
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    return contents;
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  }
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  GLuint create_glsl_shader(GLuint stype, const std::string& src, bool print_log)
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  {
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    GLuint S = glCreateShader(stype);
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    const GLchar* src_cstr = src.c_str();
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    glShaderSource(S, 1, &src_cstr, 0);
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    glCompileShader(S);
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    if(print_log && !check_glsl_shader(S))
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    {
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      print_glsl_shader_log(S);
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      glDeleteShader(S);
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      return 0;
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    }
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    return S;
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  }
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373 jrf 82 
  GLuint create_glsl_shader(GLuint stype, const std::string& path, const std::string& file)
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  {
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    string str = read_glsl_source(path, file);
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    if(!str.empty())
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    {
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      GLuint shader = create_glsl_shader(stype, str, false);
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      if(!check_glsl_shader(shader))
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      {
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        cerr << path << file << endl;
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        print_glsl_shader_log(shader);
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        glDeleteShader(shader);
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        return 0;
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      }
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      return shader;
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    }
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    return 0;
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  }
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}