🔒 Locked

Vertex Array Question

Started by Kris2456 Oct 16, 2004 at 6:53 AM 2 replies 600+ views

Original Post

Oct 16, 2004 at 6:53 AM

Hello, i am working on a .OBJ file loader so i get the hang of model loading. I plan to use vertex arrays in my model loader so that things are drawn faster, but theres one thing i dont understand. Heres my problem: I have two functions, one for loading the file, and one for drawing. The one that loads packs the data into a vertex array, and the one that draws, well... draws it. To enable arrays i have to use glEnableClientState(). So in my load function i want to have:


//in load function
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_COLOR_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);

...Pack stuff into array....

glDisableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_COLOR_ARRAY);
glDisableClientState(GL_TEXTURE_COORD_ARRAY);



//In draw function
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_COLOR_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);

...Draw stuff from array....

glDisableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_COLOR_ARRAY);
glDisableClientState(GL_TEXTURE_COORD_ARRAY);

Its just that im not sure if disabling the client state before drawing will work. I've never used arrays before. So is it possible?

CRACK123

Oct 16, 2004 at 8:58 AM

You should do the rendering totaly in render/draw function in my opinion.

void Draw(){    glEnableClientState(GL_VERTEX_ARRAY);    glVertexPointer(...);    glEnableClientState(GL_NORMAL_ARRAY);    glNormalPointer(...);    glEnableClientState(GL_TEXTURE_COORD_ARRAY);    glTexCoordPointer(...);    glDrawElements(....);        glDisableClientState(GL_VERTEX_ARRAY);    glDisableClientState(GL_NORMAL_ARRAY);    glDisableClientState(GL_TEXTURE_COORD_ARRAY);}

In load function just build the vertices/normals/textures etc. No need to call glEnableClientState or glDisableClientState.

Kris2456

Author

Kris2456

Oct 16, 2004 at 10:21 AM

Wouldnt that be a lot more proccessing?

zedzeek

164

zedzeek

Oct 16, 2004 at 3:05 PM

these commands //in load function
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_COLOR_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);

...Pack stuff into array....

glDisableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_COLOR_ARRAY);
glDisableClientState(GL_TEXTURE_COORD_ARRAY);

only make a difference if youre drawing something thus dont stick them in the loading code

Topic Locked

This topic has been locked by a moderator. New replies are not allowed.