Patrice Mandin wrote:
> Hello,
>
> fbo_firecube does not work for me, because on nv30, color and
> depth/stencil buffers must have same size. fbo_firecube asks a
> GL_DEPTH_COMPONENT16 for depth, and attach it to a 32 bits color
> buffer, which thus fails.
>
> Not valid for nv30 (and lower hardware I think):
> - 32 bits color buffer with 16 bits depth
> - 16 bits color buffer with 24 depth +8 stencil
> However, I could have
> - 16 bits color buffer with 16 bits depth
Mmmm, OK. Some other hardware supports mixing depths (such as 32-bit
RGBA + 16-bit Z). Also note that GL_ARB_framebuffer_object relaxed
the requirement that all color buffers need to be the same
format/depth so we might want to expose that feature someday.
I guess we need a way to ask the driver if it can support mixed
depths. The most flexible thing would be a new function such as
boolean
pipe_context::validate_framebuffer(struct pipe_context *pipe,
const struct
pipe_framebuffer_state *fb);
to ask the driver if the given framebuffer configuration is usable.
I'd hold off on that for now.
In the mean time, we could be more restrictive in
st_validate_framebuffer() and require all surfaces be of the same
depth. Want to try that?
Or, in the nv driver, only support 32-bit or 16-bit surfaces depending
on the screen depth.
The other issue in this case is that fbo_firecube.c should be calling
glCheckFramebufferStatus() to see if the FBO it builds is OK. If it
fails, we should try another FBO combination. I can fix that.
> glxinfo lists only the correct combinations (in the GLXFBConfig
> section), i.e. 32 bits color buffer with either 0/0 for depth/stencil
> or 24/8.
>
> In st_cb_fbo, Mesa only check if a format is valid for a given buffer.
> I did not find anywhere if there is a check for the combination of the
> color and depth/stencil buffers.
>
> I have already a patch ready, which simply enforce using a buffer with
> same number of bits as the context front buffer. I would like to know
> if there would be a better solution.
>
-Brian
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