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Diffstat (limited to 'src/gallium/docs/source/cso/blend.rst')
| -rw-r--r-- | src/gallium/docs/source/cso/blend.rst | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/src/gallium/docs/source/cso/blend.rst b/src/gallium/docs/source/cso/blend.rst index a3ccc671982..d97e3d32e92 100644 --- a/src/gallium/docs/source/cso/blend.rst +++ b/src/gallium/docs/source/cso/blend.rst @@ -24,6 +24,32 @@ performed on all enabled render targets. XXX do lops still apply if blend_enable isn't set? +For a source component `s` and destination component `d`, the logical +operations are defined as taking the bits of each channel of each component, +and performing one of the following operations per-channel: + +* ``CLEAR``: 0 +* ``NOR``: :math:`\lnot(s \lor d)` +* ``AND_INVERTED``: :math:`\lnot s \land d` +* ``COPY_INVERTED``: :math:`\lnot s` +* ``AND_REVERSE``: :math:`s \land \lnot d` +* ``INVERT``: :math:`\lnot d` +* ``XOR``: :math:`s \oplus d` +* ``NAND``: :math:`\lnot(s \land d)` +* ``AND``: :math:`s \land d` +* ``EQUIV``: :math:`\lnot(s \oplus d)` +* ``NOOP``: :math:`d` +* ``OR_INVERTED``: :math:`\lnot s \lor d` +* ``COPY``: :math:`s` +* ``OR_REVERSE``: :math:`s \lor \lnot d` +* ``OR``: :math:`s \lor d` +* ``SET``: 1 + +.. note:: + The logical operation names and definitions match those of the OpenGL API, + and are similar to the ROP2 and ROP3 definitions of GDI. This is + intentional, to ease transitions to Gallium. + Members ------- |