We need a way to specify the type of minification filter
used to downsample mipmap levels.
The old util_gen_mipmap() retains its behaviour and uses
LINEAR filter.
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.
Previously the constant color blend factor was compiled into the
generated code. This meant that the code had to be regenerated each
time the constant color was changed. This doesn't fit with the model
used in Gallium.
As-is, the code could be better. The constant color is loaded for
every quad processed, even if it is not used. Also, if a lot of (1-x)
blend factors are used, 1.0 will be loaded and reloaded into registers
many times.
If only glUniform is called between two renderings, the const buffers weren't
getting updated. Need to set the _NEW_PROGRAM flag in st_upload_constants()
as that's the dirty flag set by glUniform.
Fixes glean tapi2 test.
At this time there are no optimizations for directly blitting between
buffer objects and surfaces (always go through mappings).
glean pbo test passes now
