Lots of undeclared identifiers related to OpenGL using GLFW

Question

I'm trying to set up an OpenGL project using GLFW in Visual c++ 2008 (Windows 7). I have added the GLFW include and library directories to the project's include and library paths, and I have put the following in additional dependencies:

GLFW.lib glu32.lib opengl32.lib

That is everything I need to do, isn't it? But when I try to compile any OpenGl program (except an extremely simple one that only clears the screen using glClear) I get a bunch of undeclared identifier and identifier not found erros. Any Idea why this can happen? Here is the complete error list:

1>Compiling...
1>main.cpp
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(9) : error C2146: syntax error : missing ';' before identifier 'VBO'
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(9) : error C2377: 'GLuint' : redefinition; typedef cannot be overloaded with any other symbol
1>        c:\program files\microsoft sdks\windows\v6.0a\include\gl\gl.h(52) : see declaration of 'GLuint'
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(9) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(43) : error C3861: 'glEnableVertexAttribArray': identifier not found
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(45) : error C2065: 'GL_ARRAY_BUFFER' : undeclared identifier
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(45) : error C3861: 'glBindBuffer': identifier not found
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(47) : error C3861: 'glVertexAttribPointer': identifier not found
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(55) : error C3861: 'glDisableVertexAttribArray': identifier not found
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(78) : error C3861: 'glGenBuffers': identifier not found
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(80) : error C2065: 'GL_ARRAY_BUFFER' : undeclared identifier
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(80) : error C3861: 'glBindBuffer': identifier not found
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(82) : error C2065: 'GL_ARRAY_BUFFER' : undeclared identifier
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(82) : error C2065: 'GL_STATIC_DRAW' : undeclared identifier
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(82) : error C3861: 'glBufferData': identifier not found
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(87) : error C2146: syntax error : missing ')' before identifier 'ShaderProgram'
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(87) : error C2182: 'AddShader' : illegal use of type 'void'
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(87) : error C2440: 'initializing' : cannot convert from 'Vector3f' to 'int'
1>        No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(87) : error C2059: syntax error : ')'
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(89) : error C2143: syntax error : missing ';' before '{'
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(89) : error C2447: '{' : missing function header (old-style formal list?)
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(144) : error C2146: syntax error : missing ';' before identifier 'ShaderProgram'
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(144) : error C2065: 'ShaderProgram' : undeclared identifier
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(144) : error C3861: 'glCreateProgram': identifier not found
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(148) : error C2065: 'ShaderProgram' : undeclared identifier
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(158) : error C2065: 'ShaderProgram' : undeclared identifier
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(158) : error C2065: 'GL_VERTEX_SHADER' : undeclared identifier
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(160) : error C2065: 'ShaderProgram' : undeclared identifier
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(160) : error C2065: 'GL_FRAGMENT_SHADER' : undeclared identifier
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(166) : error C2065: 'GLchar' : undeclared identifier
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(166) : error C2146: syntax error : missing ';' before identifier 'ErrorLog'
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(166) : error C2065: 'ErrorLog' : undeclared identifier
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(166) : error C2059: syntax error : '{'
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(166) : error C2143: syntax error : missing ';' before '{'
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(166) : error C2143: syntax error : missing ';' before '}'
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(170) : error C2065: 'ShaderProgram' : undeclared identifier
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(170) : error C3861: 'glLinkProgram': identifier not found
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(172) : error C2065: 'ShaderProgram' : undeclared identifier
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(172) : error C2065: 'GL_LINK_STATUS' : undeclared identifier
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(172) : error C3861: 'glGetProgramiv': identifier not found
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(176) : error C2065: 'ShaderProgram' : undeclared identifier
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(176) : error C2065: 'ErrorLog' : undeclared identifier
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(176) : error C2070: ''unknown-type'': illegal sizeof operand
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(176) : error C2065: 'ErrorLog' : undeclared identifier
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(176) : error C3861: 'glGetProgramInfoLog': identifier not found
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(178) : error C2065: 'ErrorLog' : undeclared identifier
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(186) : error C2065: 'ShaderProgram' : undeclared identifier
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(186) : error C3861: 'glValidateProgram': identifier not found
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(188) : error C2065: 'ShaderProgram' : undeclared identifier
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(188) : error C2065: 'GL_VALIDATE_STATUS' : undeclared identifier
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(188) : error C3861: 'glGetProgramiv': identifier not found
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(192) : error C2065: 'ShaderProgram' : undeclared identifier
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(192) : error C2065: 'ErrorLog' : undeclared identifier
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(192) : error C2070: ''unknown-type'': illegal sizeof operand
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(192) : error C2065: 'ErrorLog' : undeclared identifier
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(192) : error C3861: 'glGetProgramInfoLog': identifier not found
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(194) : error C2065: 'ErrorLog' : undeclared identifier
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(202) : error C2065: 'ShaderProgram' : undeclared identifier
1>c:\glfw-2.7.3\opengl ikasi\main.cpp(202) : error C3861: 'glUseProgram': identifier not found

EDIT: here is the whole program

#include <stdio.h>

#include <string.h>
#include <GL/glfw.h>

#include "math_3d.h"


GLuint VBO;



static const char* pVS = "                                                    \n\
#version 150                                                                  \n\
\n\
layout (location = 0) in vec3 Position;                                       \n\
\n\
void main()                                                                   \n\
{                                                                             \n\
gl_Position = vec4(0.5 * Position.x, 0.5 * Position.y, Position.z, 1.0);  \n\
}";


static const char* pFS = "                                                    \n\
#version 150                                                                  \n\
\n\
out vec4 FragColor;                                                           \n\
\n\
void main()                                                                   \n\
{                                                                             \n\
FragColor = vec4(1.0, 0.0, 0.0, 1.0);                                     \n\
}";


static void RenderSceneCB()

{

    glClear(GL_COLOR_BUFFER_BIT);



    glEnableVertexAttribArray(0);

    glBindBuffer(GL_ARRAY_BUFFER, VBO);

    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, 0);



    glDrawArrays(GL_TRIANGLES, 0, 3);



    glDisableVertexAttribArray(0);

    glfwSwapBuffers();

}




static void CreateVertexBuffer()

{

    Vector3f Vertices[3];

    Vertices[0] = Vector3f(-1.0f, -1.0f, 0.0f);

    Vertices[1] = Vector3f(1.0f, -1.0f, 0.0f);

    Vertices[2] = Vector3f(0.0f, 1.0f, 0.0f);



    glGenBuffers(1, &VBO);

glBindBuffer(GL_ARRAY_BUFFER, VBO);

glBufferData(GL_ARRAY_BUFFER, sizeof(Vertices), Vertices, GL_STATIC_DRAW);

}


static void AddShader(GLuint ShaderProgram, const char* pShaderText, GLenum ShaderType)

{

    GLuint ShaderObj = glCreateShader(ShaderType);



    if (ShaderObj == 0) {

        fprintf(stderr, "Error creating shader type %d\n", ShaderType);

        return ;

    }



    const GLchar* p[1];

    p[0] = pShaderText;

    GLint Lengths[1];

    Lengths[0]= strlen(pShaderText);

    glShaderSource(ShaderObj, 1, p, Lengths);

    glCompileShader(ShaderObj);

    GLint success;

    glGetShaderiv(ShaderObj, GL_COMPILE_STATUS, &success);

    if (!success) {

        GLchar InfoLog[1024];

        glGetShaderInfoLog(ShaderObj, 1024, NULL, InfoLog);

        fprintf(stderr, "Error compiling shader type %d: '%s'\n", ShaderType, InfoLog);

        return;

    }



    glAttachShader(ShaderProgram, ShaderObj);

}


static void CompileShaders()

{

    GLuint ShaderProgram = glCreateProgram();



    if (ShaderProgram == 0) {

        fprintf(stderr, "Error creating shader program\n");

        return;

    }



    AddShader(ShaderProgram, pVS, GL_VERTEX_SHADER);

    AddShader(ShaderProgram, pFS, GL_FRAGMENT_SHADER);



    GLint Success = 0;

    GLchar ErrorLog[1024] = { 0 };



    glLinkProgram(ShaderProgram);

    glGetProgramiv(ShaderProgram, GL_LINK_STATUS, &Success);

if (Success == 0) {

glGetProgramInfoLog(ShaderProgram, sizeof(ErrorLog), NULL, ErrorLog);

fprintf(stderr, "Error linking shader program: '%s'\n", ErrorLog);

        return;

}



    glValidateProgram(ShaderProgram);

    glGetProgramiv(ShaderProgram, GL_VALIDATE_STATUS, &Success);

    if (!Success) {

        glGetProgramInfoLog(ShaderProgram, sizeof(ErrorLog), NULL, ErrorLog);

        fprintf(stderr, "Invalid shader program: '%s'\n", ErrorLog);

        return;

    }



    glUseProgram(ShaderProgram);

}


int main(int argc, char** argv)

{

    glfwInit();

    glfwOpenWindowHint(GLFW_OPENGL_VERSION_MAJOR, 3);

    glfwOpenWindowHint(GLFW_OPENGL_VERSION_MINOR, 2);

    glfwOpenWindow(600, 600, 0, 0, 0, 0, 0, 0, GLFW_WINDOW);




    glClearColor(0.0f, 0.0f, 0.0f, 0.0f);



    CreateVertexBuffer();



    CompileShaders();



   while (1)

   {

       RenderSceneCB();

   }



    return 0;

}

EDIT 2: And here the math_3d.h header

#ifndef MATH_3D_H
#define MATH_3D_H


struct Vector3f
{
    float x;
    float y;
    float z;

    Vector3f()
    {
    }

    Vector3f(float _x, float _y, float _z)
    {
        x = _x;
        y = _y;
        z = _z;
    }
};

#endif  

Anni

The very first line is a syntax error that might very well ruin include statements after it. Fix that first and see what happens. It would also be good if you included at least the first part of your program that contain these lines. – Dilks

THank you! the first error corresponds to this line: GLuint VBO;, so I think it isn't actually a sintax error, but an error caused because It doesn't know what GLuint is. I'll update the question with the first part of the program. – Anni

What's hidden inside math_3d.h? Maybe something in there is malformed? The GLuint type is found by the compiler, read the errors carefully. – Dilks

Thanks again! It's a bit hard for me to understand the errors well, but I'll try reading them more carefully. I've updated the question with math_3d.h – Anni

Which version of OpenGL you are using. – Bushido

Answer 1

The problem is spelled out pretty clearly on the OpenGL Wiki's Getting Started page. Your problem is that you don't have a mechanism to load OpenGL functions, which is a necessary step in using OpenGL. You are strongly encouraged to use a library to do that.

Parasynthesis

Just adding some detail: the compilation errors are specifically caused by the Microsoft SDK GL/gl.h header file only supporting OpenGL up to and including version 1.1. – Finder

Approved. Sorry, I've been out and I haven't been able to approve the question until now – Anni

Same problem I tried using glew doesn't work. Example code: cs.lmu.edu/~ray/notes/openglexamples I was trying lit solids – Agnella