Adding basic CBT Terrain implementation

res/shaders/terrain/Bisector.slang

@@ -0,0 +1,46 @@
+// Pointer to an invalid neighbor or index
+const static int INVALID_POINTER = 4294967295;
+
+// Possible culling state
+const static int BACK_FACE_CULLED =-3;
+const static int FRUSTUM_CULLED =-2;
+const static int TOO_SMALL =-1;
+const static int UNCHANGED_ELEMENT= 0;
+const static int BISECT_ELEMENT= 1;
+const static int SIMPLIFY_ELEMENT= 2;
+const static int MERGED_ELEMENT= 3;
+
+// Bisector flags
+const static int VISIBLE_BISECTOR = 0x1;
+const static int MODIFIED_BISECTOR = 0x2;
+
+struct BisectorData
+{
+    // Subvision that should be applied to this bisector
+    uint32_t subdivisionPattern;
+
+    // Allocated indices for this bisector
+    uint32_t indices[3];
+
+    // Neighbor that should be processed
+    uint32_t problematicNeighbor;
+
+    // State of this bisector (split, merge, etc)
+    uint32_t bisectorState;
+
+    // Visibility and modification flags of a bisector
+    uint32_t flags;
+
+    // ID used for the propagation
+    uint32_t propagationID;
+};
+
+uint heapIDDepth(uint64_t x)
+{
+    uint depth = 0;
+    while (x > 0u) {
+        ++depth;
+        x >>= 1u;
+    }
+    return depth;
+}