diff options
Diffstat (limited to 'src/gallium/docs/source/tgsi.rst')
| -rw-r--r-- | src/gallium/docs/source/tgsi.rst | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/src/gallium/docs/source/tgsi.rst b/src/gallium/docs/source/tgsi.rst index ac0ea5413b3..7d5918fc4fe 100644 --- a/src/gallium/docs/source/tgsi.rst +++ b/src/gallium/docs/source/tgsi.rst @@ -433,7 +433,11 @@ This instruction replicates its result. dst = \cos{src.x} -.. opcode:: DDX - Derivative Relative To X +.. opcode:: DDX, DDX_FINE - Derivative Relative To X + +The fine variant is only used when ``PIPE_CAP_TGSI_FS_FINE_DERIVATIVE`` is +advertised. When it is, the fine version guarantees one derivative per row +while DDX is allowed to be the same for the entire 2x2 quad. .. math:: @@ -446,7 +450,11 @@ This instruction replicates its result. dst.w = partialx(src.w) -.. opcode:: DDY - Derivative Relative To Y +.. opcode:: DDY, DDY_FINE - Derivative Relative To Y + +The fine variant is only used when ``PIPE_CAP_TGSI_FS_FINE_DERIVATIVE`` is +advertised. When it is, the fine version guarantees one derivative per column +while DDY is allowed to be the same for the entire 2x2 quad. .. math:: |