__builtin_clz with parameter 0 has undefined value. When
using -O3 optimizing this would result to too large next
power of two value.
Fix is to check if passed value is 1 and modify formula
for that case.
MACRO_SWITCH is applied to samplers but not renderbuffers. This commit
fixes incorrect rendering to large and small mipmaps where the large ones
are macrotiled and the small ones are not and both are emitted
in the same CS.
Note that this is still disabled by default (rework of texture transfers
is next).
This serves several purposes:
- disable caching in situations were is it useless or undesired
- share caches among all trees
- simplify purging the cache (when it's a single location)
- move the cache out of the tree, since that slows downs IDEs considerably
To retain previous behavior just define do
export SCONS_CACHE_DIR=$PWD/build/cache
before invoking scons.
I have more plans for this than mere debugging -- it will be an helper
to provide human readible representations of all gallium state for
the python state tracker.
This is a quick-fix for the time being...
The per-face mipmap LOD computation was invalid at cube edges. In
mip_filter_nearest/linear() we were trying to compute LOD using
texcoords that were sometimes indexes into different cube faces.
The subtraction used to compute the partial derivatives basically
gave random values, so the LOD was unpredictable. This fix simply
uses the same cube face for all four pixels in the quad. The per-
face texcoords all reference the same cube face so the partial
deriviates are computed properly.
A more elaborate fix would involve computing the LOD at the same
time as we choose the cube faces. But for now, this solution works
well and allows the piglit/cubemap test to pass.
(cherry picked from commit 1ff9cd5079)
For GL_ARB_fragment_coord_conventions.
This only applies to gl_FragCoord and controls pixel center origin and
pixel center integer. For example:
layout (origin_upper_left, pixel_center_integer) varying vec4 gl_FragCoord;
This features introduces the idea of re-declaring variables with a changed
type. This may also apply to arrays in some cases but that's not
implemented at this time.
