Blender Git Loki

Overlay: Don't always allocate the antialiasing buffer and draw background...

...in the main overlay buffer.

This is required if we do caching in the future.

DRW: ColorManagement: Fix ghosting with cycles.

DRW: ColorManagement: Fix viewport render pipeline

The final output needs to be merged in another buffer. So we still use
the offscreen buffer for that.

GPUViewport: Fix image uv editor.

GPUViewport: Add fallback colormanagment

Just assume sRGB display and no color correction.

DRW: Move color management to the GPUViewport

This moves the colormanagement step at the blitting step of the viewport.
This means the overlay (including gizmos) must all be rendered in a
separate buffer (meaning they are more or less properly color managed).

The draw manager sets the display transform to apply to the GPUViewport.

OCIO: Support overlay blending in linear colorspace in GLSL backend

This add the possibility for the caller to add an extra color texture
to composite on top of the main texture. The compositing is done in post
viewtransform linear space.

However, this means the caller needs to pass the proper color processor
to undo and apply the display transform.

DRW: Color Management: Rework code to accept new color transform needed

Overlay: Add other background types (checker and gradient)

Overlay: Cleanup Image background implementation

The background images are now rendered normally on a cleared
canvas. They then get masked by the render when the background
is drawn with a special blend mode.

DRW: Color Management: Do some rearangement of the draw code

This puts the color management functions inside one file.

We group all post transform drawing into DRW_draw_callbacks_post_scene.

Overlay: Fix background covering the outline

OCIO: Fix curve cache preventing curvemapping update

DRW: Remove DrawEngineType draw_background function

This moves all background duties to the overlay engine which does alpha
under drawing (sort of).

This means keeping transparency info through the whole pipeline.

For now I just updated workbench which surely still need some cleanups.

Only Solid background is reimplemented.

OCIO: Add back IMM hack

This is needed to avoid crash in some circumstances.

DRW: Move Color-Management handling to draw manager

This is first part of the color managmeent refactor.

The drawing of the overlays is done in a sRGB texture to retain some bits
of accuracy.

The transform is applied after the overlays blending for now.

There is much left to be done.

GPU: Add sRGB framebuffer support

Only enable GL_FRAMEBUFFER_SRGB on framebuffer objects as the main
framebuffer is likely to be srgb, and as of now we don't use linear
color for area texture.

GPUViewport: Cleanup and use always use RGBA16F

OpenColorIO: Improve/Cleanup Implementation

This split the shader cache into caches for Shader, Lut and CurveMapping.

This way we can have smoother updates when tweaking/animating the color
managment (i.e. exposure and gamma should only recompile the shader).

The curvemapping, predivide and dither options are no longer compile time
optimized but use uniforms. I did not measure any performance difference.

Cleanup: EEVEE: Move debug draw to eevee_renderpass.c