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This removes quite a bit of code duplicated in the drivers.
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This should be moved into a gallium util lib (location tbd) so it can also
be used by the state tracker.
Then, remove the pipe->get/put_tile_rgba() functions.
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Add a 'CheckQuery()' driver callback to mesa to check query completion.
Make pipe_query an opaque type.
Rework softpipe queries, support overlapping occlusion queries.
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Something similar will return when geometry shaders are added, but for now
this interface is not required.
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Directly use struct pipe_buffer_handle for storage and struct pipe_surface for
(un)mapping.
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pipe->get_tex_surface() has to be used for access to texture image data.
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Early depth test is enabled when depth test is enabled and
alpha test is disabled and fragment shader does not write
depth.
The early-z is implemented by moving the depth test stage
just before the fragment shader stage and prepending it
with an earlyz stage, introduced with this commit.
The earlyz stage prepares the quad->outputs.depth for
the following depth test stage by interpolating Z position,
just as the fragment shader would do.
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Instead of using read/write_quad() functions, do framebuffer accesses via
get/put_tile(). A cache of tiles is used to avoid frequent get/put() calls.
Only implemented for color buffers right now.
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Build a buffer of contigous vertices and indices at the backend of our
software transformation/clipping path. This will become the mechanism
for emitting buffers of vertices to rasterization hardware.
This is similar to but not the same as the post-transform vertex cache.
In particular, these vertices are subject to clipping, culling, poly offset,
etc. The vertices emitted will all be used by hardware.
TODOs include the actual transformation to hardware vertex formats, moving
this out of softpipe to somewhere more useful and allowing >1 primitive to
share the generated VB.
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Not sure if finish() is the right interface yet.
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The state_tracker driver needs these to implement, eg. pixel buffer objects,
vertex buffer objects.
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Unfortunately means you can't just type make in softpipe any more.
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Each pipe driver will build to a .a library, as these will optionally
be included in the various DRI drivers (this will make more sense once
there is at least one hardware driver...). Not strictly necessary for
softpipe, but want to minimize the differences between it and
actual hw implementations.
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softpipe/state_tracker --> state_tracker/
softpipe/ --> pipe/
softpipe/generic --> pipe/softpipe/
I don't think pipe is a great name, but I disliked all the others too.
Luckily it's fairly easy to rename with git, so this can be revisited
later.
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