Performance will be OK (although not exceptional) with VTF on GT7800 as long as you use one of the two texture formats that are hardware-accelerated in the VS - GL_LUMINANCE32F_ARB and GL_RGBA32F_ARB. Make sure you stick to NEAREST though even with these to avoid the software fallback.
i know this might sound stupid but you mean to use my textures using :
glTexImage2D(GL_TEXTURE_2D, 0, type, width, height, 0, GL_RGBA32F_ARB, GL_UNSIGNED_BYTE, imageData);
??
because when i tried that the texture doesn’t get passed to down to program shader at all. =S
This didn’t work because your user data format is invalid.
glGetError() would have told you.
It should have been GL_RGBA.
The GL_RGBA32F_ARB belongs into the internalFormat parameter!