EEVEE-Next: Motion Blur new implementation

The new implementation leverage compute shaders to reduce the
number of passes and complexity.

The max blur amount is now detected automatically, replacing the property
in the render panel by a simple checkbox.

The dilation algorithm has also been rewritten from scratch into a 1 pass
algorithm that does the dilation more efficiently and more precisely.

Some differences with the old implementation can be observed in areas with
complex motion.

1 files changed, 6 insertions, 1 deletions

diff --git a/source/blender/draw/engines/eevee_next/eevee_velocity.hh b/source/blender/draw/engines/eevee_next/eevee_velocity.hh
index 826cd631a96..01b8a5fb8c1 100644
--- a/source/blender/draw/engines/eevee_next/eevee_velocity.hh
+++ b/source/blender/draw/engines/eevee_next/eevee_velocity.hh
@@ -56,6 +56,8 @@ class VelocityModule {
   int3 object_steps_usage = int3(0);
   /** Buffer of all #VelocityIndex used in this frame. Indexed by draw manager resource id. */
   VelocityIndexBuf indirection_buf;
+  /** Frame time at which each steps were evaluated. */
+  float3 step_time;
 
   /**
    * Copies of camera data. One for previous and one for next time step.
@@ -78,7 +80,6 @@ class VelocityModule {
     }
     for (CameraDataBuf *&step_buf : camera_steps) {
       step_buf = new CameraDataBuf();
-      /*  */
     }
   };
 
@@ -112,6 +113,10 @@ class VelocityModule {
   void bind_resources(DRWShadingGroup *grp);
 
   bool camera_has_motion() const;
+  bool camera_changed_projection() const;
+
+  /* Returns frame time difference between two steps. */
+  float step_time_delta_get(eVelocityStep start, eVelocityStep end) const;
 
  private:
   bool object_has_velocity(const Object *ob);