Consider a texture call such as:
textureLod(s, coordinate, log2(...))
First, we begin setting up the sampler message by loading the texture
coordinates into MRFs, starting with m2. Then, we realize we need the
LOD, and go to compute it with:
ir->lod_info.lod->accept(this);
On Gen4-5, this will generate a SEND instruction to compute log2(),
loading the operand into m2, and clobbering our texcoord.
Similar issues exist on Gen6+. For example, nested texture calls:
textureLod(s1, c1, texture(s2, c2).x)
Any texturing call where evaluating the subexpression trees for LOD or
shadow comparitor would generate SEND instructions could potentially
break. In some cases (like register spilling), we get lucky and avoid
the issue by using non-overlapping MRF regions. But we shouldn't count
on that.
Fixes four Piglit test regressions on Gen4-5:
- glsl-fs-shadow2DGradARB-{01,04,07,cumulative}
NOTE: This is a candidate for stable release branches.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=52129
Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>
With the textureRect support and GL_CLAMP workarounds, it's grown
sufficiently that it deserves its own function. Separating it out
makes the original function much more readable.
Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>
Setting the texture offset bits in the message header involves very
specific hardware register descriptions. As such, I feel it's better
suited for the lower level "generate" layer that has direct access to
the weird register layouts, rather than at the fs_inst abstraction layer.
This also parallels the approach I took in the VS backend.
Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>
Use atom for sampler state. Does not provide new functionality
or fix any bug. Just a step toward full atom base r600g.
v2: Split seamless on r6xx/r7xx into it's own atom. Make sure it's
emited after sampler and with a pipeline flush before otherwise
it does not take effect.
Signed-off-by: Jerome Glisse <jglisse@redhat.com>
...to look like update_fragment_samplers() code, as with the previous
commit. The next step would be to merge the two functions.
Reviewed-by: José Fonseca <jfonseca@vmware.com>
Less code. And as with softpipe, if/when we consolidate the pipe_context
functions for binding sampler state, this will make the llvmpipe changes
trivial.
Reviewed-by: José Fonseca <jfonseca@vmware.com>
The functions for setting samplers and sampler views for vertex,
fragment and geometry shaders were nearly identical. Now they
use shared code.
In the future, if the pipe_context functions for setting samplers
and sampler views for vert/frag/geom/compute are combined, this
will make updating the softpipe driver a snap.
Reviewed-by: José Fonseca <jfonseca@vmware.com>
Combine separate arrays for vertex/fragment/geometry samplers, etc into
one array indexed by PIPE_SHADER_x.
This allows us to collapse separate code for vertex/fragment/geometry
state into loops over the shader stage. More to come.
Reviewed-by: José Fonseca <jfonseca@vmware.com>
Fixes dereference before null check defect reported by Coverity.
Signed-off-by: Vinson Lee <vlee@freedesktop.org>
Reviewed-by: Brian Paul <brianp@vmware.com>
Fixes uninitialized pointer read defect reported by Coverity.
Signed-off-by: Vinson Lee <vlee@freedesktop.org>
Reviewed-by: Brian Paul <brianp@vmware.com>
Fixes dereference before null check defect reported by Coverity.
Signed-off-by: Vinson Lee <vlee@freedesktop.org>
Reviewed-by: Marek Olšák <maraeo@gmail.com>
Merge the vertex/fragment versions of the cso_set/save/restore_samplers()
functions. Now we pass the shader stage (PIPE_SHADER_x) to the function
to indicate vertex/fragment/geometry samplers. For example:
cso_single_sampler(cso, PIPE_SHADER_FRAGMENT, unit, sampler);
This results in quite a bit of code reduction, fewer CSO functions and
support for geometry shaders.
Reviewed-by: Marek Olšák <maraeo@gmail.com>
Fixes uninitialized scalar variable defect reported by Coverity.
Signed-off-by: Vinson Lee <vlee@freedesktop.org>
Reviewed-by: Brian Paul <brianp@vmware.com>
