EEVEE: Viewport Renderpasses

This patch will allow the user to select the EEVEE renderpass to be
shown in the viewport by default the combined pass will be shown.

Limitations:

* Viewport rendering stores the result in a `RenderResult`. RenderResult
  is not aware of the type of data it holds. In many places where RenderResult
  is used it is assumed that it stores a combined pass and the display+view
  transform are applied.

  I will propose to fix this in a future patch. But that is still being
  designed and discussed.

Reviewed By: fclem

Differential Revision: https://developer.blender.org/D6319

1 files changed, 3 insertions, 1 deletions

diff --git a/source/blender/draw/engines/eevee/eevee_temporal_sampling.c b/source/blender/draw/engines/eevee/eevee_temporal_sampling.c
index e5f89aab4d1..0f0b4a3e0a9 100644
--- a/source/blender/draw/engines/eevee/eevee_temporal_sampling.c
+++ b/source/blender/draw/engines/eevee/eevee_temporal_sampling.c
@@ -234,7 +234,9 @@ int EEVEE_temporal_sampling_init(EEVEE_ViewLayerData *UNUSED(sldata), EEVEE_Data
       view_is_valid = view_is_valid && (ED_screen_animation_no_scrub(wm) == NULL);
     }
 
-    effects->taa_total_sample = scene_eval->eevee.taa_samples;
+    effects->taa_total_sample = EEVEE_renderpasses_only_first_sample_pass_active(vedata) ?
+                                    1 :
+                                    scene_eval->eevee.taa_samples;
     MAX2(effects->taa_total_sample, 0);
 
     DRW_view_persmat_get(NULL, persmat, false);