[Mesa-dev] [PATCH v2 0/5] panfrost: Add support for TXS instructions

[Boris Brezillon]

Hello,

TXS is needed to support the OpenGL textureSize() function but not only.
TXS instructions are also used by nir_lower_tex() to lower a RECT
texture sampling into a 2D one, which I wanted to have working to test
gallium-hud on panfrost.

Note that I decided to add a new generic lowering step to
nir_lower_tex() to lower a TXS(LOD) instruction into
max(1, TXS(0) >> LOD), which is what V3D is doing internally and would
be duplicated in the panfrost driver if we go for a non-generic
approach (see patch 2 for more details).
Let me know if you think that's preferable to have this logic moved to
the panfrost driver.

Regards,

Boris

Changes in v2:
* Drop the patch adding nir_imm_ivec3()
* Rework the emit_tex() logic to avoid duplicate the switch(texop)
  statement
* Split options for the first and second tex lowering passes

Boris Brezillon (5):
  nir/lower_tex: Add a way to lower TXS(non-0-LOD) instructions
  panfrost: Make the sysval logic more generic
  panfrost: Move sysval upload logic out of panfrost_emit_for_draw()
  panfrost: Prepare things to support non-native texture ops
  panfrost: Add support for TXS instructions

 src/compiler/nir/nir.h                        |   6 +
 src/compiler/nir/nir_lower_tex.c              |  46 +++++++
 .../panfrost/midgard/midgard_compile.c        | 125 ++++++++++++------
 .../panfrost/midgard/midgard_compile.h        |  12 +-
 src/gallium/drivers/panfrost/pan_context.c    |  96 +++++++++++---
 5 files changed, 226 insertions(+), 59 deletions(-)

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2.20.1