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The code is now living in it's intended place as a pt middle end.
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Also add some util functions in pt_util.c
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Enable with TEST_FSE=t. Performs fetch from API-provided vertex buffers,
transformation with one of three (two working) hard-coded shaders, and
final emit to hardware vertices all in a single pass.
Currently only really useful for profiling in conjunction with SP_NO_RAST=t.
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When flushing/rendering, some stages (like AA line/point) need to set
pipe/driver state. Those driver functions often call draw_flush().
That leads to recursion.
Use new draw->suspend_flush flag to explicitly prevent that in the key places.
Remove the draw->vcache_flushing field.
Reuse draw->flushing as a debug/assertion var.
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Fixes broken polygon stipple, aaline, aapoint stages
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Also, provide a separate flag to say whether the driver can handle
clipping/rhw tasks, in addition to the API flag which indicates they
have already been done.
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This state is effectively private to the vertex processing part
of the draw module.
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This is now the drawing interface to the pipeline. No more
calling into pipeline.first->tri(), etc.
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This will at least allow us to make the initial gains to get decent
vertex performance much more quickly & with higher confidence of getting
it right.
At some later point can look again at code-generating all the
fetch/cliptest/viewport extras in the same block as the vertex shader.
For now, just need to get some decent baseline performance.
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of the vertices and not always have to use the maximum vertex
allocation size for them
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Also, implement support in the draw module. We were hardwiring these
to one for quite a long time...
Currently using a draw_set_edgeflags() function, may be better to push
the argument into the draw_arrays() function. TBD.
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Add facility for draw_vbuf.c to reset these vertex ids on flushes.
Pre-initialize vertex ids correctly.
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This handles the case where bypass_vs is set, but vertices need to go
through the pipeline for some reason - eg unfilled polygon mode.
Demonstrates how to drive the pipeline from inside one of these things.
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Also:
1. Added an identity_viewport flag to skip viewport transformation when it
has no effect. Might also add an explicit bypass_viewport flag someday.
2. Separate the code for computing clip codes and doing the viewport transform.
Predicate them separately.
Note: even if bypass_vs is set, we still look at the shader to determine the
number of inputs and outputs.
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The later follows the naming scheme of other limits.
Keep the old definition until all possible usage is updated.
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Trying to put a structure in place that we can actually optimize.
Initially just implementing a passthrough mode, this will fairly soon
replace all the vertex_cache/prim_queue/shader_queue stuff that's so
hard to understand...
Split the vertex processing into a couple of distinct stages:
- Frontend
- Prepares two lists of elements (fetch and draw) to be processed
by the next stage. This stage doesn't fetch or draw vertices, but
makes the decision which to draw. Multiple implementations of this
will implement different strategies, currently just a vcache
implementation.
- MiddleEnd
- Takes the list of fetch elements, fetches them, runs the vertex
shader, cliptest, viewport transform on them to produce a
linear array of vertex_header vertices.
- Passes that list of vertices, plus the draw_elements (which index
into that list) onto the backend
- Backend
- Either the existing primitive/clipping pipeline, or the vbuf_render
hardware backend provided by the driver.
Currently, the middle-end is the old passthrough code, and it build hardware
vertices, not vertex_header vertices as above. It may be that passthrough
is a special case in this respect.
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quads)
New draw_enable_point_sprites() function.
Fixes spriteblast.c demo
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Allows drivers that implement line stipple to turn off this drawing stage.
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