* Don't force masked blending for transmission/volume materials
glTF lets you choose your own alpha mode when using the transmission
and volume material extensions. We were forcing the masked mode which
was incorrect, except to pass the standard tests.
* Update release notes
* minimal backend support for compute
- added api to dispatch a compute shader
- added api to create and bind a ssbo
- added api to read back a buffer
Only implemented in the gl backend
* Add a backend compute test suite
* basic support for compute shaders in matc
this is still very much work-in-progress.
We're not supporting images nor ssbo for now.
* rename UniformInterfaceBlock to BufferInterfaceBlock
* augment BufferInterfaceBlock to support ssbo features
- add support for std430
- add support for ssbo
- add support for variable-size array
- add support for memory qualifiers
* reformat MaterialBuilder
* material format: move subpasses outside of parameters
subpasses now are their own json property instead of being a
"parameter".
* refactor parameter() methods to match Buffer/SamplerInterfaceBlock
We're just shuffling the arguments.
* add support for buffers in .mat files
* filamat now generates buffer blocks (ssbo)
* take feature level into consideration when optimizing shaders
* don't store the 'uniform binding' chunk for level 2 materials
this includes some refactoring/cleanups of MaterialParser
* matinfo: fixes for compute
- separate subpasses from parameters
- don't attempt to print material properties
gltfio can now ask the material provider plugin which `Material` would
be used for a given set of requirements. Prior to this change, gltfio
could only create a new `MaterialInstance`.
This method is necessary to support an upcoming gltfio feature.
We no longer use the hardcoded objectUniform UBO name, instead, we
access the object uniforms through the new getObjectUniforms().
Because it's not possible to return a "Uniform Block" from a function
in GLSL, a large part of this change, is to replace the interface block
by a structure.
Note: getObjectUniforms() is not public, but it is used by gltfio to
access the userData field, which is also not public at the moment.
