This PR implements dynamic viewport state for the Vulkan gpu backend.
By doing so, it fixes#130914.
The following high-level changes were made:
1. The pipeline pool no longer uses the viewport and scissor
states to identify graphics pipelines, only the number of viewports
and the number of scissors. Graphics pipelines are configured with
dynamic viewport and scissor states upon construction.
2. The desired viewport and scissor configurations for drawing are set
in the data of the draw nodes in the render graph.
3. The draw nodes use these viewport and scissors settings in
`build_commands`. If the viewport and scissor settings have changed
between nodes, then vkCmdSetViewport and vkCmdSetScissor commands
are sent to the command buffer.
4. Tests are updated to verify that set_viewport and set_scissor commands
are executed the correct number of times. (Also note that I needed to
#136987 in order to avoid skipping some Vulkan tests).
See the attached screencast for verification. The number of graphics pipelines
no longer grow when resizing the viewport.
Pull Request: https://projects.blender.org/blender/blender/pulls/137002
5cb2b04c5c