New lightmapper

-Added LocalVector (needed it)
-Added stb_rect_pack (It's pretty cool, we could probably use it for other stuff too)
-Fixes and changes all around the place
-Added library for 128 bits fixed point (required for Delaunay3D)

thirdparty/oidn/core/autoencoder.h

@@ -0,0 +1,116 @@
+// ======================================================================== //
+// Copyright 2009-2019 Intel Corporation                                    //
+//                                                                          //
+// Licensed under the Apache License, Version 2.0 (the "License");          //
+// you may not use this file except in compliance with the License.         //
+// You may obtain a copy of the License at                                  //
+//                                                                          //
+//     http://www.apache.org/licenses/LICENSE-2.0                           //
+//                                                                          //
+// Unless required by applicable law or agreed to in writing, software      //
+// distributed under the License is distributed on an "AS IS" BASIS,        //
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. //
+// See the License for the specific language governing permissions and      //
+// limitations under the License.                                           //
+// ======================================================================== //
+
+#pragma once
+
+#include "filter.h"
+#include "network.h"
+#include "transfer_function.h"
+
+namespace oidn {
+
+  // --------------------------------------------------------------------------
+  // AutoencoderFilter - Direct-predicting autoencoder
+  // --------------------------------------------------------------------------
+
+  class AutoencoderFilter : public Filter
+  {
+  protected:
+    static constexpr int alignment       = 32;  // required spatial alignment in pixels (padding may be necessary)
+    static constexpr int receptiveField  = 222; // receptive field in pixels
+    static constexpr int overlap         = roundUp(receptiveField / 2, alignment); // required spatial overlap between tiles in pixels
+
+    static constexpr int estimatedBytesBase       = 16*1024*1024; // estimated base memory usage
+    static constexpr int estimatedBytesPerPixel8  = 889;          // estimated memory usage per pixel for K=8
+    static constexpr int estimatedBytesPerPixel16 = 2185;         // estimated memory usage per pixel for K=16
+
+    Image color;
+    Image albedo;
+    Image normal;
+    Image output;
+    bool hdr = false;
+    float hdrScale = std::numeric_limits<float>::quiet_NaN();
+    bool srgb = false;
+    int maxMemoryMB = 6000; // approximate maximum memory usage in MBs
+
+    int H = 0;          // image height
+    int W = 0;          // image width
+    int tileH = 0;      // tile height
+    int tileW = 0;      // tile width
+    int tileCountH = 1; // number of tiles in H dimension
+    int tileCountW = 1; // number of tiles in W dimension
+
+    std::shared_ptr<Executable> net;
+    std::shared_ptr<Node> inputReorder;
+    std::shared_ptr<Node> outputReorder;
+
+    struct
+    {
+      void* ldr         = nullptr;
+      void* ldr_alb     = nullptr;
+      void* ldr_alb_nrm = nullptr;
+      void* hdr         = nullptr;
+      void* hdr_alb     = nullptr;
+      void* hdr_alb_nrm = nullptr;
+    } weightData;
+
+    explicit AutoencoderFilter(const Ref<Device>& device);
+    virtual std::shared_ptr<TransferFunction> makeTransferFunc();
+
+  public:
+    void setImage(const std::string& name, const Image& data) override;
+    void set1i(const std::string& name, int value) override;
+    int get1i(const std::string& name) override;
+    void set1f(const std::string& name, float value) override;
+    float get1f(const std::string& name) override;
+
+    void commit() override;
+    void execute() override;
+
+  private:
+    void computeTileSize();
+
+    template<int K>
+    std::shared_ptr<Executable> buildNet();
+
+    bool isCommitted() const { return bool(net); }
+  };
+
+  // --------------------------------------------------------------------------
+  // RTFilter - Generic ray tracing denoiser
+  // --------------------------------------------------------------------------
+
+// Godot doesn't need Raytracing filters. Removing them saves space in the weights files.
+#if 0
+  class RTFilter : public AutoencoderFilter
+  {
+  public:
+    explicit RTFilter(const Ref<Device>& device);
+  };
+#endif
+
+  // --------------------------------------------------------------------------
+  // RTLightmapFilter - Ray traced lightmap denoiser
+  // --------------------------------------------------------------------------
+
+  class RTLightmapFilter : public AutoencoderFilter
+  {
+  public:
+    explicit RTLightmapFilter(const Ref<Device>& device);
+    std::shared_ptr<TransferFunction> makeTransferFunc() override;
+  };
+
+} // namespace oidn