EEVEE: Lookdev: Add support for partially blurred background

This is using the GGX probe as background. This has the drawback of
having the resolution choosed in the indirect lighting setting.
The blurring is not really high-quality.

The pros is that it has a simple implementation and is fast to evaluate.

This patch also fades the background alpha to make overlay engine draw the
default background color in the correct color space. Removing one colorspace
hack.

Reviewed By: jbakker

Differential Revision: https://developer.blender.org/D6895

1 files changed, 2 insertions, 1 deletions

diff --git a/source/blender/draw/engines/eevee/eevee_private.h b/source/blender/draw/engines/eevee/eevee_private.h
index dfe3dc5a538..a2ed0a16d89 100644
--- a/source/blender/draw/engines/eevee/eevee_private.h
+++ b/source/blender/draw/engines/eevee/eevee_private.h
@@ -987,6 +987,7 @@ struct GPUShader *EEVEE_shaders_probe_filter_visibility_sh_get(void);
 struct GPUShader *EEVEE_shaders_probe_grid_fill_sh_get(void);
 struct GPUShader *EEVEE_shaders_probe_planar_downsample_sh_get(void);
 struct GPUShader *EEVEE_shaders_default_studiolight_sh_get(void);
+struct GPUShader *EEVEE_shaders_background_studiolight_sh_get(void);
 struct GPUShader *EEVEE_shaders_probe_cube_display_sh_get(void);
 struct GPUShader *EEVEE_shaders_probe_grid_display_sh_get(void);
 struct GPUShader *EEVEE_shaders_probe_planar_display_sh_get(void);
@@ -1196,9 +1197,9 @@ void EEVEE_render_update_passes(struct RenderEngine *engine,
 
 /** eevee_lookdev.c */
 void EEVEE_lookdev_cache_init(EEVEE_Data *vedata,
+                              EEVEE_ViewLayerData *sldata,
                               DRWShadingGroup **grp,
                               DRWPass *pass,
-                              float background_alpha,
                               struct World *world,
                               EEVEE_LightProbesInfo *pinfo);
 void EEVEE_lookdev_draw(EEVEE_Data *vedata);