Mesa (gallium-0.2): CELL: changes to generate SPU code for stenciling

[Robert Ellison]

Module: Mesa
Branch: gallium-0.2
Commit: afaa53040bd01ca86762e7d7b1a5a65810767921
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=afaa53040bd01ca86762e7d7b1a5a65810767921

Author: Robert Ellison <papillo at tungstengraphics.com>
Date:   Fri Oct  3 18:00:43 2008 -0600

CELL: changes to generate SPU code for stenciling

This set of code changes are for stencil code generation
support.  Both one-sided and two-sided stenciling are supported.
In addition to the raw code generation changes, these changes had
to be made elsewhere in the system:

- Added new "register set" feature to the SPE assembly generation.
  A "register set" is a way to allocate multiple registers and free
  them all at the same time, delegating register allocation management
  to the spe_function unit.  It's quite useful in complex register
  allocation schemes (like stenciling).

- Added and improved SPE macro calculations.
  These are operations between registers and unsigned integer
  immediates.  In many cases, the calculation can be performed
  with a single instruction; the macros will generate the
  single instruction if possible, or generate a register load
  and register-to-register operation if not.  These macro
  functions are: spe_load_uint() (which has new ways to
  load a value in a single instruction), spe_and_uint(),
  spe_xor_uint(), spe_compare_equal_uint(), and spe_compare_greater_uint().

- Added facing to fragment generation.  While rendering, the rasterizer
  needs to be able to determine front- and back-facing fragments, in order
  to correctly apply two-sided stencil.  That requires these changes:
  - Added front_winding field to the cell_command_render block, so that
    the state tracker could communicate to the rasterizer what it
    considered to be the front-facing direction.
  - Added fragment facing as an input to the fragment function.
  - Calculated facing is passed during emit_quad().

---

 src/gallium/auxiliary/rtasm/rtasm_ppc_spe.c        |  246 +++++-
 src/gallium/auxiliary/rtasm/rtasm_ppc_spe.h        |   41 +-
 src/gallium/drivers/cell/common.h                  |    1 +
 src/gallium/drivers/cell/ppu/cell_gen_fragment.c   |  881 +++++++++++++++++---
 src/gallium/drivers/cell/ppu/cell_render.c         |    1 +
 src/gallium/drivers/cell/ppu/cell_vbuf.c           |    1 +
 src/gallium/drivers/cell/spu/spu_main.h            |    3 +-
 src/gallium/drivers/cell/spu/spu_per_fragment_op.c |   19 +-
 src/gallium/drivers/cell/spu/spu_per_fragment_op.h |    3 +-
 src/gallium/drivers/cell/spu/spu_render.c          |    4 +-
 src/gallium/drivers/cell/spu/spu_tri.c             |   35 +-
 src/gallium/drivers/cell/spu/spu_tri.h             |    2 +-
 12 files changed, 1091 insertions(+), 146 deletions(-)

Diff:   http://cgit.freedesktop.org/mesa/mesa/diff/?id=afaa53040bd01ca86762e7d7b1a5a65810767921