1 files changed, 61 insertions, 0 deletions
diff --git a/source/blender/compositor/realtime_compositor/cached_resources/COM_morphological_distance_feather_weights.hh b/source/blender/compositor/realtime_compositor/cached_resources/COM_morphological_distance_feather_weights.hh
new file mode 100644
index 00000000000..cd6827bdd6b
--- /dev/null
+++ b/source/blender/compositor/realtime_compositor/cached_resources/COM_morphological_distance_feather_weights.hh
@@ -0,0 +1,61 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#pragma once
+
+#include <cstdint>
+
+#include "GPU_shader.h"
+#include "GPU_texture.h"
+
+#include "COM_cached_resource.hh"
+
+namespace blender::realtime_compositor {
+
+/* ------------------------------------------------------------------------------------------------
+ * Morphological Distance Feather Key.
+ */
+class MorphologicalDistanceFeatherWeightsKey {
+ public:
+  int type;
+  float radius;
+
+  MorphologicalDistanceFeatherWeightsKey(int type, float radius);
+
+  uint64_t hash() const;
+};
+
+bool operator==(const MorphologicalDistanceFeatherWeightsKey &a,
+                const MorphologicalDistanceFeatherWeightsKey &b);
+
+/* -------------------------------------------------------------------------------------------------
+ * Morphological Distance Feather Weights.
+ *
+ * A cached resource that computes and caches 1D GPU textures containing the weights of the
+ * separable Gaussian filter of the given radius as well as an inverse distance falloff of the
+ * given type and radius. The weights and falloffs are symmetric, because the Gaussian and falloff
+ * functions are all even functions. Consequently, only the positive half of the filter is computed
+ * and the shader takes that into consideration. */
+class MorphologicalDistanceFeatherWeights : public CachedResource {
+ private:
+  GPUTexture *weights_texture_ = nullptr;
+  GPUTexture *distance_falloffs_texture_ = nullptr;
+
+ public:
+  MorphologicalDistanceFeatherWeights(int type, int radius);
+
+  ~MorphologicalDistanceFeatherWeights();
+
+  void compute_weights(int radius);
+
+  void compute_distance_falloffs(int type, int radius);
+
+  void bind_weights_as_texture(GPUShader *shader, const char *texture_name) const;
+
+  void unbind_weights_as_texture() const;
+
+  void bind_distance_falloffs_as_texture(GPUShader *shader, const char *texture_name) const;
+
+  void unbind_distance_falloffs_as_texture() const;
+};
+
+}  // namespace blender::realtime_compositor