Add dither functions (#11282) 599f58a196

* Add dither functions

* Update draw_raster_order_mesh.frag

* Update draw_raster_order_mesh.frag

* Update draw_raster_order_mesh.frag

* Cleaned up code

* Claaaaaaannnng

* Add to MSAA and clockwise

* More updates

* Add to atomic path

* Update draw_clockwise_atomic_path.glsl

* Claaaaannnngggg

* Add ditherScale and ditherBias to flush uniforms

* Add 4x4 bayer option

* Update common.glsl

* Added more atomic dithering

* Moved ditherScale and ditherpass to be passed in

* Clang

* clean up

* Add temporal animation on dither pattern (complement of odd frame)

* Add temporal dither as well as #Defines

* clang

* clang

* clang

* Move to shader misc flags

* clang

* clang

* Update specialization.glsl

* Fix atomic

* clang format

* fix cast to half

* Add selection of dither modes

* Clang format

* Address Chris' comments

* address more comments

* More updates

* Clang format

* Remoe lines

* Move to m_baselineShaderMiscFlags

* Move shader bits to pack to 2 instead of 3 bits

* Update gpu.hpp

* Handle VK

* Delete draw_clockwise_atomic_image_mesh.glsl

* Clang

* Address comments

* Update draw_mesh.frag

* Add GM

* Update VK

* clang format

* Update gpu.cpp

* Update dithertypes.cpp

* Update atomic_draw.glsl

* Update comparison for dither type

* clang format

* Address comments

* Update render_context.hpp

* More comments

* clang

* More comments

* More comments

* clang

* Update Gms

* GMS

* GMs

* Update background_shader_compiler.mm

* Update render_context_metal_impl.mm

* clang

* GM

* Change the dither code to be on a dynamic branch

* Removed all shader viariants for dithering

* Update common.glsl

* Remove branch on dither

* Add dither as a shader feature

* Update gpu.cpp

* Clang

* Clang

* VK

* Update dithertypes.cpp

* Clang gm

* Clang

* Update metal stuff

* Clang

* Update generate_draw_combinations.py

* Update generate_draw_combinations.py

* Update background_shader_compiler.mm

* Update render_context_metal_impl.mm

* Update render_context_metal_impl.mm

* Fix vertex

* Clang

* GMs

* Update gms

* Update draw_pipeline_vulkan.cpp

* More GMs

* Update gpu.hpp

* Update gms

* Update draw_pipeline_vulkan.cpp

* More GMs

* More GMs

* Update GMs

* Update dithertypes.cpp

* GMs

* Clang

* Update GMs

* GMS

* More gms

* Update gpu.hpp

* Address comments

* Clang

* Clang

* Update common.glsl

* Update common.glsl

* Fix metal

* clang

* Gms

* Update gpu.hpp

* gms

* gms

* goldens

* Update common.glsl

* whitespace

* Update gpu.hpp

* Update dithertypes.cpp

* Update GMS from master

* GMS

* Remove all dithertypes gm

* Clang

* Update GMs

Author: aliasbinman

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-d4355212e2f8e7358c4697525ab3b587cc8777ef
+599f58a196b7644d881014462fd26786eb9df27e