1 files changed, 69 insertions, 0 deletions
diff --git a/Source/Graphics/heightmap.h b/Source/Graphics/heightmap.h
new file mode 100644
index 00000000..7880d8cb
--- /dev/null
+++ b/Source/Graphics/heightmap.h
@@ -0,0 +1,69 @@
+//-----------------------------------------------------------------------------
+//           Name: heightmap.h
+//      Developer: Wolfire Games LLC
+//    Description: 
+//        License: Read below
+//-----------------------------------------------------------------------------
+//
+//
+//   Copyright 2022 Wolfire Games LLC
+//
+//   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 <Internal/integer.h>
+#include <Internal/modid.h>
+
+#include <string>
+#include <vector>
+
+class HeightmapImage
+{
+public:
+    enum HMScale {
+        DOWNSAMPLED = true,
+        ORIGINAL_RES = false
+    };
+    
+    HeightmapImage():width_(0),depth_(0),checksum_(0){}
+    
+    bool LoadData(const std::string& fileName, HMScale scaled);
+
+    float GetHeight(int x, int z) const;
+    float GetHeightXZ(float x, float z) const;
+
+    inline int32_t width() const {return width_;}
+    inline int32_t depth() const {return depth_;}
+    inline const std::string& path() const {return rel_path_;} 
+    inline uint16_t checksum() const {return checksum_;}
+
+    ModID modsource_;
+    
+private:
+    static const int kTerrainDimX = 1024;
+    static const int kTerrainDimY = 1024;
+    static const int kTerrainHeightScale = 32;
+    static const int kHMCacheVersion = 1;
+
+    bool ReadCacheFile(const std::string& path, uint16_t checksum);
+    void WriteCacheFile(const std::string& path);
+    bool LoadFromCacheIfAvailable(HMScale scaled);
+
+    int32_t width_;
+    int32_t depth_;
+    uint16_t checksum_;
+    std::vector<float> height_data_;
+    std::string rel_path_;
+};