Hey,

I wanted to use the vertex buffer array or object from OpenGl, but I can't get it to work.

This is what I do:

I create a widget and setup the opengl stuff.

Qt Code: 
  1. void Gui::GLWidget::initializeGL(){
  2.     glShadeModel(GL_SMOOTH);							// Enable Smooth Shading
  3.     glClearColor(0.0f, 0.0f, 0.0f, 0.5f);				// Black Background
  4.     glClearDepth(1.0f);									// Depth Buffer Setup
  5.     glEnable(GL_DEPTH_TEST);							// Enables Depth Testing
  6.     glDepthFunc(GL_LEQUAL);								// The Type Of Depth Testing To Do
  7.     glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);	// Really Nice Perspective Calculations
  8.  
  9.     GLfloat LightAmbient[]= { 0.5f, 0.5f, 0.5f, 1.0f };
  10.     GLfloat LightDiffuse[]= { 1.0f, 1.0f, 1.0f, 1.0f };
  11.     GLfloat LightPosition[]= { 0.0f, 0.0f, 2.0f, 1.0f };
  12.  
  13.     glLightfv(GL_LIGHT1, GL_AMBIENT, LightAmbient);				// Setup The Ambient Light
  14.     glLightfv(GL_LIGHT1, GL_DIFFUSE, LightDiffuse);
  15.     glLightfv(GL_LIGHT1, GL_POSITION,LightPosition);
  16.  
  17.     glEnable(GL_LIGHT1);
  18.     glEnable(GL_CULL_FACE);
  19.     glCullFace(GL_BACK);
  20. }
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Then I paint the stuff in here:

Qt Code: 
  1. void Gui::GLWidget::paintGL(){
  2.     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);	// Clear Screen And Depth Buffer
  3.     glLoadIdentity();									// Reset The Current Modelview Matrix
  4.     glTranslatef(0.0, 0.0, -30.0);						// Move Left 1.5 Units And Into The Screen 6.0
  5.  
  6.     world->render();
  7. }
  8.  
  9. void Bfe::World::render(){
  10.     qreal timeElapsed = ((qreal)time.elapsed() / 1000.0);
  11.     time.restart();
  12.  
  13.     camera->render();
  14.  
  15.     heightMap->render(wireFrame);
  16.  
  17.     for(QVector<Render::RenderObject *>::Iterator i = objects.begin(); i < objects.end(); i++)
  18.     {
  19.         (*i)->render();
  20.     }
  21. }
  22.  
  23. //I start rendering the objects with my for loop, which is one cube at the moment. But it doesn't draw
  24.  
  25. Render::Cube::Cube(){
  26.     //Create the object matrix
  27.     // cube ///////////////////////////////////////////////////////////////////////
  28.     //    v6----- v5
  29.     //   /|      /|
  30.     //  v1------v0|
  31.     //  | |     | |
  32.     //  | |v7---|-|v4
  33.     //  |/      |/
  34.     //  v2------v3
  35.     //
  36.     //
  37.     // TODO: Vertex Array doesn't work yet!
  38.  
  39.     // vertex coords array
  40.     GLfloat vertices[] =  {1,1,1,  -1,1,1,  -1,-1,1,  1,-1,1,        // v0-v1-v2-v3
  41.                 1,1,1,  1,-1,1,  1,-1,-1,  1,1,-1,        // v0-v3-v4-v5
  42.                 1,1,1,  1,1,-1,  -1,1,-1,  -1,1,1,        // v0-v5-v6-v1
  43.                 -1,1,1,  -1,1,-1,  -1,-1,-1,  -1,-1,1,    // v1-v6-v7-v2
  44.                 -1,-1,-1,  1,-1,-1,  1,-1,1,  -1,-1,1,    // v7-v4-v3-v2
  45.                  1,-1,-1,  -1,-1,-1,  -1,1,-1,  1,1,-1};   // v4-v7-v6-v5
  46.     this->vertices = &vertices[0];
  47.     // normal array
  48.     GLfloat normals[] = {0,0,1,  0,0,1,  0,0,1,  0,0,1,             // v0-v1-v2-v3
  49.                          1,0,0,  1,0,0,  1,0,0, 1,0,0,              // v0-v3-v4-v5
  50.                          0,1,0,  0,1,0,  0,1,0, 0,1,0,              // v0-v5-v6-v1
  51.                          -1,0,0,  -1,0,0, -1,0,0,  -1,0,0,          // v1-v6-v7-v2
  52.                          0,-1,0,  0,-1,0,  0,-1,0,  0,-1,0,         // v7-v4-v3-v2
  53.                          0,0,-1,  0,0,-1,  0,0,-1,  0,0,-1};        // v4-v7-v6-v5
  54.     this->normals = &normals[0];
  55.  
  56.     // color array
  57.     GLfloat colors[] = {1,1,1,  1,1,0,  1,0,0,  1,0,1,              // v0-v1-v2-v3
  58.                         1,1,1,  1,0,1,  0,0,1,  0,1,1,              // v0-v3-v4-v5
  59.                         1,1,1,  0,1,1,  0,1,0,  1,1,0,              // v0-v5-v6-v1
  60.                         1,1,0,  0,1,0,  0,0,0,  1,0,0,              // v1-v6-v7-v2
  61.                         0,0,0,  0,0,1,  1,0,1,  1,0,0,              // v7-v4-v3-v2
  62.                         0,0,1,  0,0,0,  0,1,0,  0,1,1};             // v4-v7-v6-v5
  63.     this->colors = &colors[0];
  64.  
  65. }
  66.  
  67. void Render::Cube::render(){
  68.     glEnableClientState(GL_NORMAL_ARRAY);
  69.     glEnableClientState(GL_COLOR_ARRAY);
  70.     glEnableClientState(GL_VERTEX_ARRAY);
  71.  
  72.     glNormalPointer(GL_FLOAT, 0, normals);
  73.     glColorPointer(3, GL_FLOAT, 0, colors);
  74.     glVertexPointer(3, GL_FLOAT, 0, vertices);
  75.  
  76.         glPushMatrix();
  77.             // rotate + half the size, else the cube is somewhat under the ground
  78.             glTranslatef(position.x(), position.y() + 1, position.z());
  79.  
  80.             glDrawArrays(GL_FLOAT, 0, 24);
  81.  
  82.         glPopMatrix();
  83.  
  84.     glDisableClientState(GL_NORMAL_ARRAY);
  85.     glDisableClientState(GL_COLOR_ARRAY);
  86.     glDisableClientState(GL_VERTEX_ARRAY);
  87.  
  88. }
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Can anyone give me a heads-up on what I'm doing wrong?

Also, can anyone tell me if and how I can use a vertex buffer object?