File Shader.cpp¶

#include <stdio.h>
#include <string>
#include <vector>
#include <iostream>
#include <fstream>
#include <algorithm>
#include <sstream>

#include <stdlib.h>
#include <string.h>

#include <GL/glew.h>

#include "Shader.hpp"
#include "utils/utils.h"
#include "AIAC/Log.h"

GLuint LoadShaders(const char * vertex_file_path,const char * fragment_file_path){

    assert(IsFileExist(vertex_file_path));
    assert(IsFileExist(fragment_file_path));

    // Create the shaders
    GLuint VertexShaderID = glCreateShader(GL_VERTEX_SHADER);
    GLuint FragmentShaderID = glCreateShader(GL_FRAGMENT_SHADER);

    // Read the Vertex Shader code from the file
    std::string VertexShaderCode;
    std::ifstream VertexShaderStream(vertex_file_path, std::ios::in);
    if(VertexShaderStream.is_open()){
        std::stringstream sstr;
        sstr << VertexShaderStream.rdbuf();
        VertexShaderCode = sstr.str();
        VertexShaderStream.close();
    }else{
        AIAC_ERROR("Impossible to open {0}. Are you in the right directory ? Don't forget to read the FAQ !\n", vertex_file_path);
        getchar();
        return 0;
    }

    // Read the Fragment Shader code from the file
    std::string FragmentShaderCode;
    std::ifstream FragmentShaderStream(fragment_file_path, std::ios::in);
    if(FragmentShaderStream.is_open()){
        std::stringstream sstr;
        sstr << FragmentShaderStream.rdbuf();
        FragmentShaderCode = sstr.str();
        FragmentShaderStream.close();
    }

    GLint Result = GL_FALSE;
    int InfoLogLength;


    // Compile Vertex Shader
    char const * VertexSourcePointer = VertexShaderCode.c_str();
    glShaderSource(VertexShaderID, 1, &VertexSourcePointer , NULL);
    glCompileShader(VertexShaderID);

    // Check Vertex Shader
    glGetShaderiv(VertexShaderID, GL_COMPILE_STATUS, &Result);
    glGetShaderiv(VertexShaderID, GL_INFO_LOG_LENGTH, &InfoLogLength);
    if ( InfoLogLength > 0 ){
        std::vector<char> VertexShaderErrorMessage(InfoLogLength+1);
        glGetShaderInfoLog(VertexShaderID, InfoLogLength, NULL, &VertexShaderErrorMessage[0]);
    }



    // Compile Fragment Shader
    char const * FragmentSourcePointer = FragmentShaderCode.c_str();
    glShaderSource(FragmentShaderID, 1, &FragmentSourcePointer , NULL);
    glCompileShader(FragmentShaderID);

    // Check Fragment Shader
    glGetShaderiv(FragmentShaderID, GL_COMPILE_STATUS, &Result);
    glGetShaderiv(FragmentShaderID, GL_INFO_LOG_LENGTH, &InfoLogLength);
    if ( InfoLogLength > 0 ){
        std::vector<char> FragmentShaderErrorMessage(InfoLogLength+1);
        glGetShaderInfoLog(FragmentShaderID, InfoLogLength, NULL, &FragmentShaderErrorMessage[0]);
        printf("%s\n", &FragmentShaderErrorMessage[0]);
    }

    // Link the program
    GLuint ProgramID = glCreateProgram();
    glAttachShader(ProgramID, VertexShaderID);
    glAttachShader(ProgramID, FragmentShaderID);
    glLinkProgram(ProgramID);

    // Check the program
    glGetProgramiv(ProgramID, GL_LINK_STATUS, &Result);
    glGetProgramiv(ProgramID, GL_INFO_LOG_LENGTH, &InfoLogLength);
    if ( InfoLogLength > 0 ){
        std::vector<char> ProgramErrorMessage(InfoLogLength+1);
        glGetProgramInfoLog(ProgramID, InfoLogLength, NULL, &ProgramErrorMessage[0]);
    }


    glDetachShader(ProgramID, VertexShaderID);
    glDetachShader(ProgramID, FragmentShaderID);

    glDeleteShader(VertexShaderID);
    glDeleteShader(FragmentShaderID);

    return ProgramID;
}