CELL: finish fragment ops blending (except for unusual D3D modes)

- Added new "macro" functions spe_float_min() and spe_float_max()
  to rtasm_ppc_spe.{ch}.  These emit instructions that cause
  the minimum or maximum of each element in a vector of floats
  to be saved in the destination register.

- Major changes to cell_gen_fragment.c to implement all the blending
  modes (except for the mysterious D3D-based PIPE_BLENDFACTOR_SRC1_COLOR,
  PIPE_BLENDFACTOR_SRC1_ALPHA, PIPE_BLENDFACTOR_INV_SRC1_COLOR, and
  PIPE_BLENDFACTOR_INV_SRC1_ALPHA).

- Some revamping of code in cell_gen_fragment.c: use the new spe_float_min()
  and spe_float_max() functions (instead of expanding these calculations
  inline via macros); create and use an inline utility function for handling
  "optional" register allocation (for the {1,1,1,1} vector, and the
  blend color vectors) instead of expanding with macros; use the Float
  Multiply and Subtract (fnms) instruction to simplify and optimize many
  blending calculations.

1 files changed, 8 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/rtasm/rtasm_ppc_spe.h b/src/gallium/auxiliary/rtasm/rtasm_ppc_spe.h
index 2579045232..4ef05ea27d 100644
--- a/src/gallium/auxiliary/rtasm/rtasm_ppc_spe.h
+++ b/src/gallium/auxiliary/rtasm/rtasm_ppc_spe.h
@@ -322,6 +322,14 @@ spe_zero(struct spe_function *p, unsigned rT);
 extern void
 spe_splat_word(struct spe_function *p, unsigned rT, unsigned rA, int word);
 
+/** rT = float min(rA, rB) */
+extern void
+spe_float_min(struct spe_function *p, unsigned rT, unsigned rA, unsigned rB);
+
+/** rT = float max(rA, rB) */
+extern void
+spe_float_max(struct spe_function *p, unsigned rT, unsigned rA, unsigned rB);
+
 
 /* Floating-point instructions
  */