Fix from hell

src/main/java/me/cortex/nvidium/managers/SectionManager.java

@@ -63,12 +63,17 @@ public void uploadChunkBuildResult(ChunkBuildOutput result) {
 
         int terrainAddress;
         {
-            //If the section had terrain data associated with it, free it
-            if ((terrainAddress = this.section2terrain.remove(sectionKey)) != -1) {
+            //Attempt to reuse the same memory
+            terrainAddress = this.section2terrain.get(sectionKey);
+            if (terrainAddress != -1 && !this.terrainAreana.canReuse(terrainAddress, output.quads())) {
+                this.section2terrain.remove(sectionKey);
                 this.terrainAreana.free(terrainAddress);
+                terrainAddress = -1;
+            }
+            if (terrainAddress == -1) {
+                terrainAddress = this.terrainAreana.allocQuads(output.quads());
             }
 
-            terrainAddress = this.terrainAreana.allocQuads(output.quads());
             this.section2terrain.put(sectionKey, terrainAddress);
 
             long geometryUpload = terrainAreana.upload(uploadStream, terrainAddress);

src/main/java/me/cortex/nvidium/util/BufferArena.java

@@ -79,4 +79,8 @@ public float getFragmentation() {
         long expected = totalQuads * vertexFormatSize * 4;
         return (float) ((double)expected/getMemoryUsed());
     }
+
+    public boolean canReuse(int addr, int quads) {
+        return this.segments.getSize(addr) == quads;
+    }
 }

src/main/java/me/cortex/nvidium/util/UploadingBufferStream.java

@@ -40,6 +40,15 @@ public UploadingBufferStream(RenderDevice device, int frames, long size) {
         segments.setLimit(size);
         buffer = device.createClientMappedBuffer(size);//Fixes an off by one in the limit testing of the segment buffer
         TickableManager.register(this);
+
+        //FIXME: this is a rediculous hack cause i cannot find the root issue
+        // it seems like the first time something is uploaded it borks completely
+        // or something, maybe its just some vertex data overruning or something
+        // cause if i dont do this the first 16 bytes are set to 0 when the stream gets uploaded
+        var dummy = device.createDeviceOnlyMappedBuffer(256);
+        this.getUpload(dummy, 0, 256);
+        this.commit();
+        dummy.delete();
     }
 
     private long caddr = -1;