[Mesa-dev] [PATCH] meta: Add GLSL variant of _mesa_meta_GenerateMipmap() function

[Brian Paul]

On 08/28/2012 12:14 AM, Anuj Phogat wrote:
> This reduces the overhead of using the fixed function internally
> in the driver.
>
> Note: ARB_fragment_shader is not present in intel->gen<  4. I'll send
> out a separate patch to avoid enabling _mesa_meta_GenerateMipmap() in
> those chips.
> No regressions observed in all.tests with this patch. Need more testing
> for integer textures.

A recent ARB bug report points out that linear filtering is not 
supported for integer textures.  And thus, there's some question about 
what to do for automatic mipmap generation of integer textures.  It 
doesn't always make sense to average four integer texels to produce a 
new one.

I'll monitor the bug and see what the ARB decides on.  We might wind 
up just raising GL_INVALID_OPERATION.

-Brian