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.. _blend:
Blend
=====
This state controls blending of the final fragments into the target rendering
buffers.
Blend Factors
-------------
The blend factors largely follow the same pattern as their counterparts
in other modern and legacy drawing APIs.
XXX blurb about dual-source blends
Members
-------
independent_blend_enable
If enabled, blend state is different for each render target, and
for each render target set in the respective member of the rt array.
If disabled, blend state is the same for all render targets, and only
the first member of the rt array contains valid data.
logicop_enable
Enables logic ops. Cannot be enabled at the same time as blending, and
is always the same for all render targets.
logicop_func
The logic operation to use if logic ops are enabled. One of PIPE_LOGICOP.
dither
Whether dithering is enabled. Note: Dithering is implementation-dependent.
rt
Contains the per-rendertarget blend state.
Per-rendertarget Members
------------------------
blend_enable
If blending is enabled, perform a blend calculation according to blend
functions and source/destination factors. Otherwise, the incoming fragment
color gets passed unmodified (but colormask still applies).
rgb_func
The blend function to use for rgb channels. One of PIPE_BLEND.
rgb_src_factor
The blend source factor to use for rgb channels. One of PIPE_BLENDFACTOR.
rgb_dst_factor
The blend destination factor to use for rgb channels. One of PIPE_BLENDFACTOR.
alpha_func
The blend function to use for the alpha channel. One of PIPE_BLEND.
alpha_src_factor
The blend source factor to use for the alpha channel. One of PIPE_BLENDFACTOR.
alpha_dst_factor
The blend destination factor to use for alpha channel. One of PIPE_BLENDFACTOR.
colormask
Bitmask of which channels to write. Combination of PIPE_MASK bits.
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