XR: Fix for Viewport Denoising Artifacts

Addresses T76003. When using VR with Eevee and viewport denoising,
scene geometry could sometimes be occluded for one eye. Solution is
to use a separate GPUViewport/GPUOffscreen for each VR view instead
of reusing a single one for rendering.

Reviewed By: Julian Eisel, Clément Foucault

Differential Revision: http://developer.blender.org/D11858

1 files changed, 7 insertions, 1 deletions

diff --git a/source/blender/windowmanager/xr/intern/wm_xr_intern.h b/source/blender/windowmanager/xr/intern/wm_xr_intern.h
index 9bf63be61dd..24582388228 100644
--- a/source/blender/windowmanager/xr/intern/wm_xr_intern.h
+++ b/source/blender/windowmanager/xr/intern/wm_xr_intern.h
@@ -85,9 +85,15 @@ typedef struct wmXrRuntimeData {
   wmXrSessionExitFn exit_fn;
 } wmXrRuntimeData;
 
-typedef struct {
+typedef struct wmXrViewportPair {
+  struct wmXrViewportPair *next, *prev;
   struct GPUOffScreen *offscreen;
   struct GPUViewport *viewport;
+} wmXrViewportPair;
+
+typedef struct {
+  /* Offscreen buffers/viewports for each view. */
+  ListBase viewports; /* wmXrViewportPair */
 } wmXrSurfaceData;
 
 typedef struct wmXrDrawData {