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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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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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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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Based on a patch from Zack.
Basically, implement a new draw_arrays function that copies the incoming
user-vertices to the hardware vertex buffer, doing format/type conversion
as needed.
The vertex fetch/store code is totally temporary for now.
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This fixes a validation/code-path problem. Enabling the stage for the sake
of wide points also inadvertantly caused wide lines to be converted to tris
when we actually want them passed through, such as for the AA line stage.
This is just cleaner now.
Also, replace draw_convert_wide_lines() with draw_wide_line_threshold() as
was done for points. Allows for 1-pixel lines to be converted too if needed.
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