* Do MTL feature check for Depth Clamping
(cherry picked from commit ae6e83c3b2e695918ffcd8bbf7ce3a1b32e2b36e)
# Conflicts:
# wgpu-hal/src/metal/adapter.rs
* make feature support check conform
* clean code
* avoid same featureset checks multiple times
* cargo fmt'ed
* enable CLEAR_COMMANDS feature for all adapters
* replaced fill_buffer with clear_buffer (minus variable value)
* Improve clear buffer/texture test
and remove unused clear-buffer.ron test
* renamed clear_image to clear_texture
* skeleton for new wgpu-hal clear_texture
* clear_texture implementation for vulkan
* clear_texture now restricts usage
* clear_texture implementation for dx12
* Implemented clear_texture for Metal backend
* Clean up GLES clear_buffer and leave note on how to implement clear_texture in the future
* fix linux compilation & formatting issues
* comment & namespace fixes
* Extent3d has now a simple mipmap calculating function
Fix incorrect use of texture.size in clear_texture for metal/dx12
Fix incorrect mip/layer ranges in clear_texture for metal/dx12
* hal/metal: support Features::NON_FILL_POLYGON_MODE
* Document Metal support for NON_FILL_POLYGON_MODE
* Split Features::NON_FILL_POLYGON_MODE in two
Adds two new features: `LINE_POLYGON_MODE` and `POINT_POLYGON_MODE`.
Allows metal to support `PolygonMode::Line` while not being required to
support `PolygonMode::Point`.
* Formatting
* Rename {LINE,POINT}_POLYGON_MODE to POLYGON_MODE_{LINE,POINT}
The backend panics while trying to process uniform global variables
when the variable's name is not found in the emitted ReflectionInfo.
This patch converts the panicking line into an explicit check, and
ignores the corresponding global variable if the name iis not found.
Resolves#1803
