program.cpp

   1 #include "program.hpp"
   2 #include <fstream>
   3 #include <sstream>
   4 #include <iostream>
   5
   6 using namespace std;
   7
   8 void attachShader(GLuint progId, string filePath, GLenum type) {
   9         GLuint shader = glCreateShader(type);
  10
  11         if (!shader) {
  12                 cerr << "error creating shader" << endl;
  13                 exit(1);
  14         }
  15
  16         ifstream file(filePath);
  17         stringstream buffer;
  18         buffer << file.rdbuf();
  19         string str = buffer.str();
  20         const char* contents = str.c_str();
  21
  22         glShaderSource(shader, 1, (const GLchar**)&contents, NULL);
  23         glCompileShader(shader);
  24         GLint success;
  25         glGetShaderiv(shader, GL_COMPILE_STATUS, &success);
  26         if (!success) {
  27                 GLchar log[1024];
  28                 glGetShaderInfoLog(shader, 1024, NULL, log);
  29                 fprintf(stderr, "error: %s\n", log);
  30                 exit(1);
  31         }
  32         glAttachShader(progId, shader);
  33 }
  34
  35 Program::Program(const string vertexShader, const string fragmentShader) {
  36         progId = glCreateProgram();
  37
  38         attachShader(progId, vertexShader, GL_VERTEX_SHADER);
  39         attachShader(progId, fragmentShader, GL_FRAGMENT_SHADER);
  40
  41         glLinkProgram(progId);
  42         GLint success = 0;
  43         glGetProgramiv(progId, GL_LINK_STATUS, &success);
  44         if (!success) {
  45                 GLchar log[1024];
  46                 glGetProgramInfoLog(progId, sizeof(log), NULL, log);
  47                 fprintf(stderr, "error linking: %s\n", log);
  48                 exit(1);
  49         }
  50 }
  51
  52 void Program::validate() const {
  53         glValidateProgram(progId);
  54
  55         GLint success;
  56         glGetProgramiv(progId, GL_VALIDATE_STATUS, &success);
  57         if (!success) {
  58                 GLchar log[1024];
  59                 glGetProgramInfoLog(progId, sizeof(log), NULL, log);
  60                 fprintf(stderr, "error: %s\n", log);
  61                 exit(1);
  62         }
  63 }
  64