> Questions:
>
> 1. Do texture maps always have to be the same width & height? And do
> they have to also be powers of 2?
The width and height need not be the same. Conventional OpenGL texturing is
limited to images with power-of-two dimensions and an optional 1-texel
border.
http://www.opengl.org//registry/specs/ARB/texture_non_power_of_two.txt
See Overview section.
> 2. Is there a list of VRAM and GL_MAX_TEXTURE_SIZE values for the
> most common graphics cards out there? Or, are there any "rules of
> thumb" which would suffice? I'm not looking for great detail, just
> something along the lines of "pretty much every graphics chip sold
> after 200X had at least Z total VRAM and supported NxN texture
> sizes". This will help me describe my "minimum systems requirements".
http://www.opengl.org/resources/faq/technical/texture.htm
See 21.130 What's the maximum size texture map my device will render
hardware accelerated?
HTH
Thomas C.
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