This avoids issues with dereferencing stale cliprects around intel_draw_buffer
time. Additionally, take advantage of cliprects staying constant for FBOs and
DRI2, and emit cliprects in the batchbuffer instead of having to flush batch
each time they change.
Conflicts:
src/mesa/drivers/dri/intel/intel_span.c
src/mesa/main/fbobject.c
This converts the i915 driver to use the GEM interfaces for object management.
This lets us avoid duplicated code for doing so, including the depthstencil
paths that aren't covered by SpanRenderStart/Finish. Those paths were
missing the span funcs setup, leading to a null dereference in the fbotexture
demo.
The boolean that the server gives us for whether the region is tiled was
getting used as the enum for what tiling mode. Instead, guess the correct
tiling in screen setup.
Also, fix the Y-tiling pitch setup. The pitch to the next tile in Y is
32 scanlines, not 8.
It turns out that it's not just deviceID dependent, and there's some additional
undefined factor that determines the bit 6 swizzling. It's now controllable
with swizzle_mode=[012] until we get a response on how to automatically detect.
These fields are no longer indexed by shader output. Now, we just have
a simple array of renderbuffer pointers.
If the shader writes to gl_FragData[i], send those colors to the N
_ColorDrawBuffers. Otherwise, replicate the single gl_FragColor (or
the fixed-function color) to the N _ColorDrawBuffers.
A few more changes and simplifications can follow from this...
Putting the bufmgr in the screen is not thread-safe since the emit_reloc
changes. It also led to a significant performance hit from pthread usage
for the attempted thread-safety (up to 12% of a cpu spent on refcounting
protection in single-threaded 965). The motivation had been to allow
multi-context bufmgr sharing in classic mode, but it wasn't worth the cost.
