This removes the old `DrawEngineType` and use the new `DrawEngine`
virtual class instead.
This removes a lot of boilerplate functions that were only there for
legacy reason.
To this end, some engines that were based on static functions have been
refactored into `Instance` classes. This was particularly cumbersome
for the Grease pencil engine which needed some more refactoring.
The `Engine` class that is in each namespace is a workaround to isolate
the internal implementation (i.e. the `Instance`) to the engine
modules. Without this, the whole engine is getting included in each
compile unit that includes the `Instance` class. Eventually, if we get
rid of these intricate dependencies, we could remove the `Engine` class.
Pull Request: https://projects.blender.org/blender/blender/pulls/136001
This refactor part of `draw_manager_c.cc` to make it more understandable
and less bug prone.
- Splits the context handing to `draw_gpu_context.cc`
- Rename `draw_manager_c.cc` to `draw_context.cc`
- Merge `DRWContextState` into `DRWContext`
- Merge lots of static functions into `DRWContext` to avoid global access
- Deduplicate code between entry point functions
- Move context init logic to `DRWContext` constructor
- Move resource init logic to `DRWContext::acquire_data`
- Move extraction `TaskGraph` out of `DRWContext`
- Reduce / centralize complexity of enabling draw engines
- Reduce the amount of `drw_get` calls
- Remove unused code
Pull Request: https://projects.blender.org/blender/blender/pulls/135821
Before we start porting image engine to the new drawing manager
we should do some cleanups.
- Use similar namespace as other draw engines (`blender::image_engine`)
- Switched InstanceData and Instance
- Reduce parameters as drawing mode can access Instance.
- Remove some templates to improve readability.
Pull Request: https://projects.blender.org/blender/blender/pulls/131146
