Wgpu

Changed:

* The backend selection is automatic by default. To force a backend, the `WGPU_BACKEND_TYPE` environment variable can be set to e.g. "Vulkan". It could be good to do this on Windows to prevent selection of DX12 for now.

Added:

* `adapter.properties` now has actual values, allowing inspection of the selected
GPU and backend.
* Added back support for filtering float32 textures by enabling a certain wgpu feature
by default.

Fixed:

* An error in the docs of `create_render_pipeline`.
* Vulkan backend is now forced to prevent DX12 being select and causing probems
because it's less mature.

This release uses a new version of wgpu-native which has changed quite a bit internally. There
is more validation (thus more restrictions). There are only a few changes to the API.
However, one big change is that shaders can now be provided as both SpirV and WGSL. Due to
the strict validation, most shaders compiled by PyShader are not usable anymore. We
recommend using WGSL instead.

Added:

* Added `GPUAdapter.properties` (the amount of information it contains will increase in the future).
* Added proper support for WGSL.

Changed:

* Renamed `renderpass.set_blend_color` -> `set_blend_constant`.
* Stricter validation of SpirV shaders.
* Float32 texture formats must now use a non-filtering sampler and texture-sample-type.
* Integer texture formats can no longer use a texture (use `textureLoad` instead).
* ... and more tighter restrictions.

Removed:

* The API concerning debug markers and groups is temporarily removed.
* Adapter and device features is temporarily removed.
* Adapter and device limits is temporarily removed.

- Crates:
- `wgpu-types`: common types between native and web targets
- `wgpu-core`: internal API for the native and remote wrappers
- Features:
- based on gfx-hal-0.5
- moved from Rendy to the new `gfx-memory` and `gfx-descriptor` crates
- passes are now recorded on the client side. The user is also responsible to keep all resources referenced in the pass up until it ends recording.
- coordinate system is changed to have Y up in the rendering space
- revised GPU lifetime tracking of all resources
- revised usage tracking logic
- all IDs are now non-zero
- Mailbox present mode
- Validation:
- active pipeline
- Fixes:
- lots of small API changes to closely match upstream WebGPU
- true read-only storage bindings
- unmapping dropped buffers
- better error messages on misused swapchain frames

wgpu-core-0.4.3 (2020-01-20)

- improved swap chain error handling

wgpu-core-0.4.2 (2019-12-15)

- fixed render pass transitions

wgpu-core-0.4.1 (2019-11-28)

- fixed depth/stencil transitions
- fixed dynamic offset iteration

- Platforms: removed OpenGL/WebGL support temporarily
- Features:
- based on gfx-hal-0.4 with the new swapchain model
- exposing adapters from all available backends on a system
- tracking of samplers
- cube map support with an example
- Validation:
- buffer and texture usage

wgpu-core-0.3.3 (2019-08-22)

- fixed instance creation on Windows

wgpu-core-0.3.1 (2019-08-21)

- fixed pipeline barriers that aren't transitions

- Platforms: experimental OpenGL/WebGL
- Crates:
- Rust API is moved out to [another repository](https://github.com/gfx-rs/wgpu-rs)
- Features:
- based on gfx-hal-0.3 with help of `rendy-memory` and `rendy-descriptor`
- type-system-assisted deadlock prevention (for locking internal structures)
- texture sub-resource tracking
- `raw-window-handle` integration instead of `winit`
- multisampling with an example
- indirect draws and dispatches
- stencil masks and reference values
- native "compute" example
- everything implements `Debug`
- Validation
- vertex/index/instance ranges at draw calls
- bing groups vs their expected layouts
- bind group buffer ranges
- required stencil reference, blend color

wgpu-core-0.2.6 (2019-04-04)

- fixed frame acquisition GPU waits

wgpu-core-0.2.5 (2019-03-31)

- fixed submission tracking
- added support for blend colors
- fixed bind group compatibility at the gfx-hal level
- validating the bind groups and blend colors

wgpu-core-0.2.3 (2019-03-20)

- fixed vertex format mapping
- fixed building with "empty" backend on Windows
- bumped the default descriptor pool size
- fixed host mapping alignments
- validating the uniform buffer offset