NVidia: 4096^2 FBO not working on GF7950GTX

[skynet]

I'm creating a GL_RGBA16F texture, 4096*4096, mipmapped.

After that, for each mipmap level, I'm creating a FBO and attach the level to the FBO.
This works for all levels down to level 1.
However, for level 0 (4096x4096), glCheckFramebufferStatus suddenly returns GL_FRAMEBUFFER_UNSUPPORTED.

GL_MAX_TEXTURE_SIZE is 4096
GL_MAX_RENDERBUFFERS_IZE is 4096
GL_MAX_VIEWPORT_DIMS is 4096x4096

So, I'm assuming a bug in the driver.
This was tested on a machine with Forceware 258.96 installed on a WinXP64 machine. The gfx card is a GF7950GTX (512MB)

[malexander]

Just curious if a GL_RGBA8 texture works. Perhaps it's size of the buffer, in bytes, that's causing the unsupported error (128MB).

[kRogue]

4096x4096 at GL_RGBA16F = 8*16MB =256MB which is half the total VRAM you have, might be that there is just not 256MB left.. though I'd think the creation of the texture memory would have failed... did you check for GL errors after each glTexImage2D call?

[Alfonse Reinheart]

4096*4096*8 is 128MB, not 256.

[kRogue]

Oops, indeed it it which makes the error caused by out of memory not terribly likely.

[skynet]

Update:
GL_RGBA8 works with 4096x4096 right away
GL_RGBA16F works up to (and including) 3872x3872; any size above will result in GL_FRAMEBUFFER_UNSUPPORTED

Disclaimer: by "works" I mean, it will create the texture and all its mipmap levels and attaching level 0 to an FBO results in GL_FRAMEBUFFER_COMPLETE.