diff options
| author | Ilia Mirkin <[email protected]> | 2014-08-14 00:04:41 -0400 |
|---|---|---|
| committer | Ilia Mirkin <[email protected]> | 2014-08-14 20:25:32 -0400 |
| commit | 8ee74ce50f980a15ab68ad40df702831ac8d68e0 (patch) | |
| tree | b37d94b92b53266bc97abaecfbb803898aa35dce /src/gallium/docs/source | |
| parent | 3fa384db0cbc903fa287017a1bbc8b032204c184 (diff) | |
gallium: add opcodes/cap for fine derivative support
Signed-off-by: Ilia Mirkin <[email protected]>
Reviewed-by: Marek Olšák <[email protected]> (v1)
Reviewed-by: Roland Scheidegger <[email protected]> (v1)
v2: Reuse opcode gaps as suggested by Marek
Diffstat (limited to 'src/gallium/docs/source')
| -rw-r--r-- | src/gallium/docs/source/screen.rst | 2 | ||||
| -rw-r--r-- | src/gallium/docs/source/tgsi.rst | 12 |
2 files changed, 12 insertions, 2 deletions
diff --git a/src/gallium/docs/source/screen.rst b/src/gallium/docs/source/screen.rst index 814e3aec69b..6fecc15d6b8 100644 --- a/src/gallium/docs/source/screen.rst +++ b/src/gallium/docs/source/screen.rst @@ -213,6 +213,8 @@ The integer capabilities: * ``PIPE_CAP_DRAW_INDIRECT``: Whether the driver supports taking draw arguments { count, instance_count, start, index_bias } from a PIPE_BUFFER resource. See pipe_draw_info. +* ``PIPE_CAP_TGSI_FS_FINE_DERIVATIVE``: Whether the fragment shader supports + the FINE versions of DDX/DDY. .. _pipe_capf: 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:: |