1 files changed, 58 insertions, 0 deletions
diff --git a/source/blender/draw/engines/eevee_next/shaders/eevee_velocity_resolve_comp.glsl b/source/blender/draw/engines/eevee_next/shaders/eevee_velocity_resolve_comp.glsl
new file mode 100644
index 00000000000..b68b2eaf117
--- /dev/null
+++ b/source/blender/draw/engines/eevee_next/shaders/eevee_velocity_resolve_comp.glsl
@@ -0,0 +1,58 @@
+
+/**
+ * Fullscreen pass that compute motion vector for static geometry.
+ * Animated geometry has already written correct motion vectors.
+ */
+
+#pragma BLENDER_REQUIRE(common_view_lib.glsl)
+#pragma BLENDER_REQUIRE(eevee_velocity_lib.glsl)
+
+#define is_valid_output(img_) (imageSize(img_).x > 1)
+
+void main()
+{
+  ivec2 texel = ivec2(gl_GlobalInvocationID.xy);
+  vec4 motion = imageLoad(velocity_view_img, texel);
+
+  bool pixel_has_valid_motion = (motion.x != VELOCITY_INVALID);
+  float depth = texelFetch(depth_tx, texel, 0).r;
+  bool is_background = (depth == 1.0f);
+
+  vec2 uv = vec2(texel) * drw_view.viewport_size_inverse;
+  vec3 P_next, P_prev, P_curr;
+
+  if (pixel_has_valid_motion) {
+    /* Animated geometry. View motion already computed during prepass. Convert only to camera. */
+    // P_prev = get_world_space_from_depth(uv + motion.xy, 0.5);
+    // P_curr = get_world_space_from_depth(uv, 0.5);
+    // P_next = get_world_space_from_depth(uv + motion.zw, 0.5);
+    return;
+  }
+  else if (is_background) {
+    /* NOTE: Use viewCameraVec to avoid imprecision if camera is far from origin. */
+    vec3 vV = viewCameraVec(get_view_space_from_depth(uv, 1.0));
+    vec3 V = transform_direction(ViewMatrixInverse, vV);
+    /* Background has no motion under camera translation. Translate view vector with the camera. */
+    /* WATCH(fclem): Might create precision issues. */
+    P_next = camera_next.viewinv[3].xyz + V;
+    P_curr = camera_curr.viewinv[3].xyz + V;
+    P_prev = camera_prev.viewinv[3].xyz + V;
+  }
+  else {
+    /* Static geometry. No translation in world space. */
+    P_curr = get_world_space_from_depth(uv, depth);
+    P_prev = P_curr;
+    P_next = P_curr;
+  }
+
+  vec4 vel_camera, vel_view;
+  velocity_camera(P_prev, P_curr, P_next, vel_camera, vel_view);
+
+  if (in_texture_range(texel, depth_tx)) {
+    imageStore(velocity_view_img, texel, vel_view);
+
+    if (is_valid_output(velocity_camera_img)) {
+      imageStore(velocity_camera_img, texel, vel_camera);
+    }
+  }
+}