EEVEE-Next: Add Temporal-AntiAliasing

The improvements over the old implementation are:
- Improved history reprojection filter (catmull-rom)
- Use proper velocity for history reprojection.
- History clipping is now done in YCoCg color space using better algorithm.
- Velocity is dilated to keep correct edge anti-aliasing on moving objects.

As a result, the 3x3 blocks that made the image smoother in the previous
implementation are no longer visible is replaced by correct antialiasing.

This removes the velocity resolve pass in order to reduce the bandwidth
usage. The velocities are just resolved as they are loadded in the film
pass.

1 files changed, 6 insertions, 9 deletions

diff --git a/source/blender/draw/engines/eevee_next/eevee_view.cc b/source/blender/draw/engines/eevee_next/eevee_view.cc
index f4dba47721d..1a222dc4ebd 100644
--- a/source/blender/draw/engines/eevee_next/eevee_view.cc
+++ b/source/blender/draw/engines/eevee_next/eevee_view.cc
@@ -80,7 +80,6 @@ void ShadingView::sync()
 
   // dof_.sync(winmat_p, extent_);
   // mb_.sync(extent_);
-  velocity_.sync();
   // rt_buffer_opaque_.sync(extent_);
   // rt_buffer_refract_.sync(extent_);
   // inst_.hiz_back.view_sync(extent_);
@@ -103,18 +102,20 @@ void ShadingView::render()
 
   RenderBuffers &rbufs = inst_.render_buffers;
   rbufs.acquire(extent_, owner);
-  velocity_.acquire(extent_);
   combined_fb_.ensure(GPU_ATTACHMENT_TEXTURE(rbufs.depth_tx),
                       GPU_ATTACHMENT_TEXTURE(rbufs.combined_tx));
   prepass_fb_.ensure(GPU_ATTACHMENT_TEXTURE(rbufs.depth_tx),
-                     GPU_ATTACHMENT_TEXTURE(velocity_.view_vectors_get()));
+                     GPU_ATTACHMENT_TEXTURE(rbufs.vector_tx));
 
   update_view();
 
   DRW_stats_group_start(name_);
   DRW_view_set_active(render_view_);
 
-  float4 clear_velocity(VELOCITY_INVALID);
+  /* If camera has any motion, compute motion vector in the film pass. Otherwise, we avoid float
+   * precision issue by setting the motion of all static geometry to 0. */
+  float4 clear_velocity = float4(inst_.velocity.camera_has_motion() ? VELOCITY_INVALID : 0.0f);
+
   GPU_framebuffer_bind(prepass_fb_);
   GPU_framebuffer_clear_color(prepass_fb_, clear_velocity);
   /* Alpha stores transmittance. So start at 1. */
@@ -137,18 +138,14 @@ void ShadingView::render()
   // inst_.lights.debug_draw(view_fb_);
   // inst_.shadows.debug_draw(view_fb_);
 
-  velocity_.resolve(rbufs.depth_tx);
-
   // GPUTexture *final_radiance_tx = render_post(combined_tx_);
 
   inst_.film.accumulate(sub_view_);
 
   rbufs.release();
+  postfx_tx_.release();
 
   DRW_stats_group_end();
-
-  postfx_tx_.release();
-  velocity_.release();
 }
 
 GPUTexture *ShadingView::render_post(GPUTexture *input_tx)