Looks good to me. For the series
Reviewed-by: Nicolai Hähnle <nicolai.haeh...@amd.com>
On 12.06.2017 21:55, Brian Paul wrote:
I've since discovered the fragment shader sample mask system value (which
corresponds to gl_SampleMaskIn).
v2: It's a system value, not a shader input.
---
src/gallium/docs/source/tgsi.rst | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/src/gallium/docs/source/tgsi.rst b/src/gallium/docs/source/tgsi.rst
index 5c2bd29..9cc397b 100644
--- a/src/gallium/docs/source/tgsi.rst
+++ b/src/gallium/docs/source/tgsi.rst
@@ -3328,10 +3328,17 @@ the center of the fragment.
TGSI_SEMANTIC_SAMPLEMASK
""""""""""""""""""""""""
-For fragment shaders, this semantic label indicates that an output contains
-the sample mask used to disable further sample processing. The output's
-type is uint[4] but only the X component is used (i.e. gl_SampleMask[0]).
-Each bit corresponds to one sample position (up to 32x MSAA is supported).
+For fragment shaders, this semantic label can be applied to either a
+shader system value input or output.
+
+For a system value, the sample mask indicates the set of samples covered by
+the current primitive. If MSAA is not enabled, the value is (1, 0, 0, 0).
+
+For an output, the sample mask is used to disable further sample processing.
+
+For both, the register type is uint[4] but only the X component is used
+(i.e. gl_SampleMask[0]). Each bit corresponds to one sample position (up
+to 32x MSAA is supported).
TGSI_SEMANTIC_INVOCATIONID
""""""""""""""""""""""""""
--
Lerne, wie die Welt wirklich ist,
Aber vergiss niemals, wie sie sein sollte.
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