1 files changed, 48 insertions, 0 deletions
diff --git a/source/blender/draw/engines/eevee_next/shaders/eevee_motion_blur_lib.glsl b/source/blender/draw/engines/eevee_next/shaders/eevee_motion_blur_lib.glsl
new file mode 100644
index 00000000000..436fd01795a
--- /dev/null
+++ b/source/blender/draw/engines/eevee_next/shaders/eevee_motion_blur_lib.glsl
@@ -0,0 +1,48 @@
+
+
+/* -------------------------------------------------------------------- */
+/** \name Tile indirection packing
+ * \{ */
+
+#define MotionPayload uint
+
+/* Store velocity magnitude in the MSB to be able to use it with atomicMax operations. */
+MotionPayload motion_blur_tile_indirection_pack_payload(vec2 motion, uvec2 payload)
+{
+  /* NOTE: Clamp to 16383 pixel velocity. After that, it is tile position that determine the tile
+   * to dilate over. */
+  uint velocity = min(uint(ceil(length(motion))), 0x3FFFu);
+  /* Designed for 512x512 tiles max. */
+  return (velocity << 18u) | ((payload.x & 0x1FFu) << 9u) | (payload.y & 0x1FFu);
+}
+
+/* Return thread index. */
+ivec2 motion_blur_tile_indirection_pack_payload(uint data)
+{
+  return ivec2((data >> 9u) & 0x1FFu, data & 0x1FFu);
+}
+
+uint motion_blur_tile_indirection_index(uint motion_step, uvec2 tile)
+{
+  uint index = tile.x;
+  index += tile.y * MOTION_BLUR_MAX_TILE;
+  index += motion_step * MOTION_BLUR_MAX_TILE * MOTION_BLUR_MAX_TILE;
+  return index;
+}
+
+#define MOTION_PREV 0u
+#define MOTION_NEXT 1u
+
+#define motion_blur_tile_indirection_store(table_, step_, tile, payload_) \
+  if (true) { \
+    uint index = motion_blur_tile_indirection_index(step_, tile); \
+    atomicMax(table_[index], payload_); \
+  }
+
+#define motion_blur_tile_indirection_load(table_, step_, tile_, result_) \
+  if (true) { \
+    uint index = motion_blur_tile_indirection_index(step_, tile_); \
+    result_ = motion_blur_tile_indirection_pack_payload(table_[index]); \
+  }
+
+/** \} */