1 files changed, 52 insertions, 0 deletions
diff --git a/source/blender/compositor/realtime_compositor/cached_resources/COM_symmetric_blur_weights.hh b/source/blender/compositor/realtime_compositor/cached_resources/COM_symmetric_blur_weights.hh
new file mode 100644
index 00000000000..05d3c7c6f3e
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+++ b/source/blender/compositor/realtime_compositor/cached_resources/COM_symmetric_blur_weights.hh
@@ -0,0 +1,52 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#pragma once
+
+#include <cstdint>
+
+#include "BLI_math_vec_types.hh"
+
+#include "GPU_shader.h"
+#include "GPU_texture.h"
+
+#include "COM_cached_resource.hh"
+
+namespace blender::realtime_compositor {
+
+/* ------------------------------------------------------------------------------------------------
+ * Symmetric Blur Weights Key.
+ */
+class SymmetricBlurWeightsKey {
+ public:
+  int type;
+  float2 radius;
+
+  SymmetricBlurWeightsKey(int type, float2 radius);
+
+  uint64_t hash() const;
+};
+
+bool operator==(const SymmetricBlurWeightsKey &a, const SymmetricBlurWeightsKey &b);
+
+/* -------------------------------------------------------------------------------------------------
+ * Symmetric Blur Weights.
+ *
+ * A cached resource that computes and caches a 2D GPU texture containing the weights of the filter
+ * of the given type and radius. The filter is assumed to be symmetric, because the filter
+ * functions are evaluated on the normalized distance to the center. Consequently, only the upper
+ * right quadrant are computed and the shader takes that into consideration. */
+class SymmetricBlurWeights : public CachedResource {
+ private:
+  GPUTexture *texture_ = nullptr;
+
+ public:
+  SymmetricBlurWeights(int type, float2 radius);
+
+  ~SymmetricBlurWeights();
+
+  void bind_as_texture(GPUShader *shader, const char *texture_name) const;
+
+  void unbind_as_texture() const;
+};
+
+}  // namespace blender::realtime_compositor