OpenGL superbible 5th edition. Triangle.cpp

Question

I've recently started learning OpenGl through the SB fifth edition, unfortunately got stuck right at the first example they provide.

Here's the code:

#include <GLTools.h>
#include <GLShaderManager.h>
#include <GL/glew.h>
#include <GL/glut.h>


GLShaderManager shaderManager;
GLBatch triangleBatch;
void ChangeSize(GLsizei w, GLsizei h);

void ChangeSize(int w, int h){
    glViewport(0,0,w,h);
}

void SetupRC(){
    //background
    glClearColor(0.0f, 0.0f, 1.0f, 1.0f);


    shaderManager.InitializeStockShaders();

    GLfloat vVerts[] = { -0.5f, 0.0f, 0.0f,
                          0.5f, 0.0f, 0.0f,
                          0.0f, 0.5f, 0.0f};


    triangleBatch.Begin(GL_TRIANGLES, 3);
    triangleBatch.CopyVertexData3f(vVerts);
    triangleBatch.End();

}

void RenderScene(void){

    glClear(GL_COLOR_BUFFER_BIT |GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);

    GLfloat vRed[] = {1.0f, 0.0f, 0.0f, 1.0f};
    shaderManager.UseStockShader(GLT_SHADER_IDENTITY, vRed);
    triangleBatch.Draw();


    glutSwapBuffers();
}


int main(int argc, char* argv[])
{
    //gltSetWorkingDirectory(argv[0]);
    glutInit(&argc,argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH | GLUT_STENCIL);


    glutInitWindowSize(800,600);
    glutCreateWindow("Triangle");


    glutReshapeFunc(ChangeSize);
    //
    glutDisplayFunc(RenderScene);

    GLenum err=glewInit();

    if(GLEW_OK != err) {
        fprintf(stderr, "GLEW error: %s\n", glewGetErrorString(err));
        return 1;
    }

    SetupRC();

    glutMainLoop();
    return 0;
}    

Though, I don't think the problem lies in the code because I've simply copy pasted it from the book. I've added the libraries included in the book's contents and also installed freeglut. So now he finds all the headers I need however there is a huge list of issues not related to triangle.cpp in itself, when I try to build. Here are some:

1>c:\users\whatever\desktop\sb5\src\gltools\include\gltools.h(183): warning C4800: 'int' : forcing value to bool 'true' or 'false' (performance warning)
1>c:\users\whatever\desktop\sb5\src\gltools\include\gltools.h(183): error C2059: syntax error : ')'
1>c:\users\whatever\desktop\sb5\src\gltools\include\gltools.h(184): error C2146: syntax error : missing ')' before identifier 'width'
1>c:\users\whatever\desktop\sb5\src\gltools\include\gltools.h(184): error C2182: 'gltGenerateOrtho2DMat' : illegal use of type 'void'
1>c:\users\whatever\desktop\sb5\src\gltools\include\gltools.h(184): error C2059: syntax error : ')'
1>c:\users\whatever\desktop\sb5\src\gltools\include\gl\glew.h(234): error C2378: 'GLuint' : redefinition; symbol cannot be overloaded with a typedef
1>          c:\users\whatever\desktop\sb5\src\gltools\include\gltools.h(177) : see declaration of 'GLuint'
1>c:\users\whatever\desktop\sb5\src\gltools\include\gl\glew.h(235): error C2378: 'GLint' : redefinition; symbol cannot be overloaded with a typedef
1>c:\users\whatever\desktop\sb5\src\gltools\include\gltools.h(162) : see declaration of 'GLint'
1>c:\users\whatever\desktop\sb5\src\gltools\include\gl\glew.h(238): error C2378: 'GLbyte' : redefinition; symbol cannot be overloaded with a typedef
1>          c:\users\whatever\desktop\sb5\src\gltools\include\gltools.h(153) : see declaration of 'GLbyte'
1>c:\users\whatever\desktop\sb5\src\gltools\include\gl\glew.h(804): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\whatever\desktop\sb5\src\gltools\include\gl\glew.h(804): error C2143: syntax error : missing ',' before '*'
1>c:\users\whatever\desktop\sb5\src\gltools\include\gl\glew.h(805): error C2146: syntax error : missing ')' before identifier 'i'
1>c:\users\whatever\desktop\sb5\src\gltools\include\gl\glew.h(805): warning C4229: anachronism used : modifiers on data are ignored
1>c:\users\whatever\desktop\sb5\src\gltools\include\gl\glew.h(805): error C2182: 'glArrayElement' : illegal use of type 'void'
1>c:\users\whatever\desktop\sb5\src\gltools\include\gl\glew.h(805): error C2491: 'glArrayElement' : definition of dllimport data not allowed
1>c:\users\whatever\desktop\sb5\src\gltools\include\gl\glew.h(805): error C2059: syntax error : ')'
1>c:\users\whatever\desktop\sb5\src\gltools\include\gl\glew.h(807): error C2061: syntax error : identifier 'GLuint'
1>c:\users\whatever\desktop\sb5\src\gltools\include\gl\glew.h(810): error C2146: syntax error : missing ')' before identifier 'list'
1>c:\users\whatever\desktop\sb5\src\gltools\include\gl\glew.h(810): warning C4229: anachronism used : modifiers on data are ignored
1>c:\users\whatever\desktop\sb5\src\gltools\include\gl\glew.h(810): error C2182: 'glCallList' : illegal use of type 'void'
1>c:\users\whatever\desktop\sb5\src\gltools\include\gl\glew.h(810): error C2491: 'glCallList' : definition of dllimport data not allowed
1>c:\users\whatever\desktop\sb5\src\gltools\include\gl\glew.h(810): error C2059: syntax error : ')'
1>c:\users\whatever\desktop\sb5\src\gltools\include\gl\glew.h(817): error C2146: syntax error : missing ')' before identifier 's'
1>c:\users\whatever\desktop\sb5\src\gltools\include\gl\glew.h(817): warning C4229: anachronism used : modifiers on data are ignored
1>c:\users\whatever\desktop\sb5\src\gltools\include\gl\glew.h(817): error C2182: 'glClearStencil' : illegal use of type 'void'
1>c:\users\whatever\desktop\sb5\src\gltools\include\gl\glew.h(817): error C2491:     'glClearStencil' : definition of dllimport data not allowed

I really can't make anything out of this. It looks as if the errors are in the header themselves. Like these there are hundred more and from other header files. I hope I was explicit enough with the problem I'm trying to expose. If something was not clear please feel free to ask. I'll try to be less vague

Also, I'm using Microsoft Visual C++ 2010.

Answer 1

Since you're working on Windows, you will have to include windows.h before gl.h. I'm not sure about the other headers you've included, but make sure check for that. A different order will usually cause these warnings and errors to appear.