Fixes the following GLSL error on Mac OS X.
'=' :  assigning non-constant to 'const 3-component vector of float'

Jose should probably review this since he wrote the original code.

Avoid emitting fences when not needed.
Speeds up glReadPixels quite a bit when reading image row by row.

We weren't saving the per-scene texture references at the right point.

Fixes piglit cubemap segfault.  The segfault resulted from referencing
texture memory which was prematurely freed because of a missed reference
count.

Fixes fd.o bug 27276.

meta ops should work ok without kms.

Fixes piglit glsl-orangebook-ch06-bump, regressed with
4fc5732225

Since texture's can be shared by many contexts, the texture's sampler
view's context pointer might be invalid by time we delete the texture.

Prevent crashes/etc by setting the sampler view's context to be the
calling context before deleting it.  This should be safe as long as
all contexts which share the texture are using the same gallium driver.
That's a reasonable assumption since pipe_texture objects aren't
compatible between different drivers anyway.

To be consistent with other Mesa driver functions.

Just to be consistent.

This should hopefully fix a build failure reported by Chris Ball when
binutils-gold is used.

We still don't do proper min/mag filtering but this is better than just
sampling the base mipmap level all the time.

Fixes piglit depth-level-clamp test.  Fixes fd.o bug 27256.

This is a quick & dirty solution, but it works.  See comments in
the code for other ideas.

Fixes regressions/breakage seen in progs/xdemos/glxheads, etc. from commit
6632915e95.

_glapi_Context and _glapi_Dispatch have different constness between
TLS and non-TLS builds.

Currently the test link uses -lGL to define the glapi symbols.

This makes it impossible to build DRI drivers on systems without
Mesa installed and without building the libGL from the Mesa tree
first.

Some automated build systems trigger this problem.

This commit removes -lGL and instead adds a dummy implementation of
glapi to dri_test.c

This, along with Kristian's commit, should fix all known regressions
due to the addition of unresolved symbol checking.

The variable X_LIBS from AC_PATH_XTRA contains only the -L searchdir
parameter and not the -lX11 to link to Xlib. Use X11 prefixed build vars
for linking with Xlib to avoid the conflict.

Signed-off-by: Dan Nicholson <dbn.lists@gmail.com>

This will make sure we pick up libdrm_$(chipset).so from the right place.

We're still abusing the flags by putting them where our driver stores
ctx->NewState changes.  Making them into more restricted state change
flags would be a project for later.

Fixes a failure where calling intel_draw_buffer() too often would trip
up Mesa assertions about when Mesa state could get changed, when it hadn't.

Bug #27034.

On some systems, putting vertex and index buffers in VRAM instead of GART
memory eliminates massive graphics corruption which is otherwise present,
due to unclear causes.

This patch adds an environment variable that does that, along with helpful
messages.

It turns it on by default on G7x, as it is what I am seeing corruption
on and some other reports also seemed to pinpoint these cards.

Currently we allocate buffers in GART or VRAM at creation time.

However, when using swtnl, this results in reads from uncached
memory, which drastically impair performance.

So, for now, cause nouveau_screen.c to not pass any placement flags
to buffer creation, so that the buffers are moved later.

Previously libdrm itself did this, but was changed to not to do it.

This may introduce an extra copy in normal usage, but this currently
does not seem to introduce significant performance degradation.

This will be revisited when pipebuffer is integrated.

Note that for AGP systems, properly solving this may be complex
since currently there is no fast way of reading from GART/VRAM.

We will probably need to try mapping AGP as writethrough and, in
addition, make buffer creation more aware of future buffer usage.

Fixes a segfault when clearing a non-existent stencil buffer.

Using just mv may cause prompts on some systems/configurations.

Conflicts:

	Makefile
	src/gallium/state_trackers/glx/xlib/xm_api.c
	src/mesa/drivers/dri/intel/intel_blit.c
	src/mesa/drivers/dri/intel/intel_pixel_copy.c
	src/mesa/main/version.h

We had fast paths for PIPE_FUNC_LESS and LEQUAL before.  To satisfy
OpenGL invariance rules, all depth compare modes should produce the
same fragment Z values.

Fixes progs/demos/singlebuffer.c

This is a back-port of commit ef2664da6c
from master.

Currently we are continuously spewing messages about these variables
since we call debug_get_bool_option everytime we want to check their value.

This is annoying, slows things down due to terminal rerendering
and obscures useful messages.

This patch only calls debug_get_bool_option once and caches the result in a
static variable.

This patch re-emits the viewport state on framebuffer or rasterizer
change.

This seems to be necessary on nv3x, but the reason is not fully
understood.

It is quite likely that this isn't really the correct fix, but seems
to work, and makes nv3x much better.

This is a different approach to solving this problem that the patch
I previously posted, and unlike that, should not cause any problems.

Right now undefined symbols in DRI drivers will still allow the
build to succeed.

As a result, people modifying drivers they cannot test risk creating
unloadable drivers with no easy way of automatically avoiding it.

For instance, the modifications to nv50 for context transfers caused
such an issue recently.

Unfortunately, just adding -Wl,--no-undefined doesn't work, because
the DRI drivers depend on glapi symbols, but do not depend on
libGL.so.1

Adding -lGL is not the correct solution since DRI drivers are not loaded
just by libGL, but also by X and possibly by other clients.

So, this patch simply tries to build an executable linked to the DRI
driver and to libGL.
If the DRI driver contains any undefined symbols not satisfied by its
dependencies or by libGL, this will fail.

This solution does not alter the built drivers, and does not significantly
slow down the build process.

All classic DRI drivers as well as all the Gallium drivers with configure
options compiled successfully with this change.

Thanks to Xavier Chantry <chantry.xavier@gmail.com> and
Michel Daenzer <michel@daenzer.net> for helping with this.

Signed-off-by: Luca Barbieri <luca@luca-barbieri.com>
Acked-by: Brian Paul <brian.e.paul@gmail.com>

Add the Makefile of Gallium EGL drivers and demos using EGL to the
tarballs.

This can happen when an X window is destroyed behind our back.  We use
DRI2CopyRegion behind the scenes in many places (like flushing the fake
front to the real front) so we have to ignore X errors triggered in that
case.

The glean test cases trigger this consistently as they don't destroy the
GLX drawable nicely, they just destroy the X window.

This can happen when an X window is destroyed behind our back.  We use
DRI2CopyRegion behind the scenes in many places (like flushing the fake
front to the real front) so we have to ignore X errors triggered in that
case.

The glean test cases trigger this consistently as they don't destroy the
GLX drawable nicely, they just destroy the X window.