Hey.

I've been trying to get my rendering working but I'm sure I'm missing something and I can't see what I'm doing wrong here..

struct Model_OBJ
{
   vector<GLfloat> vertices;
   vector<GLushort> elements;

   GLuint vbo_vertices;
   GLuint ibo;
};

Init:

glGenBuffers(1,&Model[i].ibo);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER,Model[i].ibo);
glBufferData(GL_ELEMENT_ARRAY_BUFFER,Model[i].elements.size() * sizeof(GLushort),Model[i].elements.data(),GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER,0);
		
glGenBuffers(1,&Model[i].vbo_vertices);
glBindBuffer(GL_ARRAY_BUFFER,Model[i].vbo_vertices);
glBufferData(GL_ARRAY_BUFFER,Model[i].vertices.size() * sizeof(GLfloat),Model[i].vertices.data(),GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER,0);

Render: this doesn't draw the model

void CCore::DrawModel(Model_OBJ model, float x, float y, float z)
{
...
   glBindBuffer(GL_ELEMENT_ARRAY_BUFFER,model.ibo);

   glBindBuffer(GL_ARRAY_BUFFER,model.vbo_vertices);
   glEnableClientState(GL_VERTEX_ARRAY);
   glVertexPointer(3,GL_FLOAT,0,&model.vertices.front());

   glDrawElements(GL_TRIANGLES,model.elements.size(),GL_UNSIGNED_SHORT,NULL);

   glDisableClientState(GL_VERTEX_ARRAY);
   glBindBuffer(GL_ARRAY_BUFFER,0);

   glBindBuffer(GL_ELEMENT_ARRAY_BUFFER,0);
...
}

Render (alternative): this draws the model

void CCore::DrawModel(Model_OBJ model, float x, float y, float z)
{
...
   glBindBuffer(GL_ELEMENT_ARRAY_BUFFER,model.ibo);

   //glBindBuffer(GL_ARRAY_BUFFER,model.vbo_vertices);
   glEnableClientState(GL_VERTEX_ARRAY);
   glVertexPointer(3,GL_FLOAT,0,&model.vertices.front());

   glDrawElements(GL_TRIANGLES,model.elements.size(),GL_UNSIGNED_SHORT,NULL);

   glDisableClientState(GL_VERTEX_ARRAY);
   //glBindBuffer(GL_ARRAY_BUFFER,0);

   glBindBuffer(GL_ELEMENT_ARRAY_BUFFER,0);
...
}

Am I storing the VBO data somehow wrong? I've googled alot but I can't figure out what's the problem.

Can I ask you why are you using the fixed functionality? (glEnableClientState...)

My guess is binding another buffer without doing anything with the previous buffer would just elminate your indicies which you try to use through glDrawElements.

Try moving the first binding before you the call to glDrawElements.

Can I ask you why are you using the fixed functionality? (glEnableClientState...)

My guess is binding another buffer without doing anything with the previous buffer would just elminate your indicies which you try to use through glDrawElements.

Try moving the first binding before you the call to glDrawElements.

Didn't cross my mind tbh, I copied stuff from my old project.. haven't been programming in a long long time...

I'll try that when I get a chance, thanks

Thanks for the reply, I double checked .data() and .front() and got it working with:

void CCore::DrawModel(Model_OBJ model, float x, float y, float z)
{
...
   glBindBuffer(GL_ARRAY_BUFFER,model.vbo_vertices);
   glEnableClientState(GL_VERTEX_ARRAY);
   glVertexPointer(3,GL_FLOAT,0,0);
   // instead of
   // glVertexPointer(3,GL_FLOAT,0,&model.vertices.front());

   glBindBuffer(GL_ELEMENT_ARRAY_BUFFER,model.ibo);
   glDrawElements(GL_TRIANGLES,model.elements.size(),GL_UNSIGNED_SHORT,NULL);

   glDisableClientState(GL_VERTEX_ARRAY);
   glBindBuffer(GL_ARRAY_BUFFER,0);

   glBindBuffer(GL_ELEMENT_ARRAY_BUFFER,0);
...
}