We now validate the passed in profile, and return the selected profile
from 'Context3D.profile'. We don't yet alter the available
registers/textures based on the profile.
After some testing, and looking at OpenFL, I believe I've
determined the correct behavior for AGAL sampling:
Each time a Context3D.setProgram or Context3D.setSamplerStateAt
call is made, the sampler config for the used texture slot(s)
is updated with the new wrapping/filter behavior. For setProgram,
this comes from all of the 'tex' opcodes used within the program.
However, when the 'ignoresampler' flag is set in a 'tex' opcode,
the setProgram call does *not* override the existing sampler config.
As a result, that program will sample with the behavior determined
by the most recent setSamplerStateAt or setProgram call involving
the used texture slot(s).
Previously, we were always overriding the opcode sampler config
with the values from Context3D.setSamplerStateAt. However, I didn't
realize that the order of the calls matter, so none of my tests ended
up observing the effect of 'ignoresampler'.
We now need to process AGAL bytecode twice - a quick initial
parse to determine the sampler configs (which need to be updated
when we call 'setProgram'), and a second time when to build the
Naga module (which needs to wait until we have the vertex attributes
available, which can be changed by ActionScript after setting
the program).
This is our first non-rgba texture format (it uses Bc3RgbaUnorm).
ATF files store these textures in a very convoluted way - fortunately,
the 'dds2atf' tool is open-source, which allowed me to figure out
how to decode the texture back to a DXT5/DXT1 texture.
Since wgpu hasn't yet released a version with this feature, I manually
backported it to the 0.17 branch.
This doesn't work on Windows (HLSL), but works on all other platforms.
Some experimentation with Pixel Bender Studio shows
that Opcode::Loop has a 23-byte payload. I haven't tried to
figure out how to interpet the payload yet, but we can now
skip over the opcode instead of bailing out entirely.