Texturing gives me horribly slow framerates. Why?

OpenGL OpenGL: Basic Coding
1

Hi,

I have an AMD Thunderbird 900MHz, ATI Rage Fury 128 AGP (32Mb), and 96Mb PC100 RAM. When I texture some triangles in OpenGL (using Nehe’s code), my framerate drops horrifically. I have a theory that maybe it’s not being sent to video memory… any ideas on this? Why is it so slow?

2

The pixelformat might not be accelerated, if so you’re getting software rendering. Try switching to 16bit colour.

3

it does sound like u have software unacceleration try glGetString( GL_VENDOR )

4

I’m using 16 bit colour. My card does run 32 bit colour nice and quick though usually…

I’ve never used glGetString before, how can I display it?

5

char *str = glGetString( GL_VENDOR );
printf("%s
", str );

6

I think you gotta use char *str = (char *)glGetString( GL_VENDOR ) at least I have to for c++. But performance does tank when you use textures, especially if you use large textures. If you have blending etc on it’ll tank it even more.

7

Just to make sure that you aren’t making one of the common early mistakes, you aren’t by chance calling glTexImage2D every frame, are you?