add if (SystemInfo.supportsAsyncGPUReadback) check to unitytile.cs el…

…evation methods for opengl support
mapbox · May 29, 2021 · 5c91bc1 · 5c91bc1
1 parent 07a1b2c
commit 5c91bc1
Showing 1 changed file with 45 additions and 2 deletions.
diff --git a/sdkproject/Assets/Mapbox/Unity/MeshGeneration/Data/UnityTile.cs b/sdkproject/Assets/Mapbox/Unity/MeshGeneration/Data/UnityTile.cs
@@ -172,6 +172,51 @@ public void SetHeightData(RasterTile rasterTile, float heightMultiplier = 1f, bo
 
 			var tileId = rasterTile.Id;
 
+			if (SystemInfo.supportsAsyncGPUReadback)
+			{
+				AsyncGpuReadbackForElevation(rasterTile, heightMultiplier, useRelative, callback, tileId);
+			}
+			else
+			{
+				SyncReadForElevation(rasterTile, heightMultiplier, useRelative, callback);
+			}
+		}
+
+		private void SyncReadForElevation(RasterTile rasterTile, float heightMultiplier, bool useRelative, Action<UnityTile> callback)
+		{
+			byte[] rgbData = rasterTile.Texture2D.GetRawTextureData();
+			//var rgbData = _heightTexture.GetRawTextureData<Color32>();
+			var relativeScale = useRelative ? _relativeScale : 1f;
+			var width = rasterTile.Texture2D.width;
+			for (float yy = 0; yy < _heightDataResolution; yy++)
+			{
+				for (float xx = 0; xx < _heightDataResolution; xx++)
+				{
+					var index = (((int) ((yy / _heightDataResolution) * width) * width) + (int) ((xx / _heightDataResolution) * width));
+
+					float r = rgbData[index * 4 + 1];
+					float g = rgbData[index * 4 + 2];
+					float b = rgbData[index * 4 + 3];
+					//var color = rgbData[index];
+					// float r = color.g;
+					// float g = color.b;
+					// float b = color.a;
+					//the formula below is the same as Conversions.GetAbsoluteHeightFromColor but it's inlined for performance
+					HeightData[(int) (yy * _heightDataResolution + xx)] = relativeScale * heightMultiplier * (-10000f + ((r * 65536f + g * 256f + b) * 0.1f));
+					//678 ==> 012345678
+					//345
+					//012
+				}
+			}
+
+			if (callback != null)
+			{
+				callback(this);
+			}
+		}
+
+		private void AsyncGpuReadbackForElevation(RasterTile rasterTile, float heightMultiplier, bool useRelative, Action<UnityTile> callback, CanonicalTileId tileId)
+		{
 			AsyncGPUReadback.Request(rasterTile.Texture2D, 0, (t) =>
 			{
 				if (CanonicalTileId != tileId || IsRecycled)
@@ -213,8 +258,6 @@ public void SetHeightData(RasterTile rasterTile, float heightMultiplier = 1f, bo
 					}
 				}
 
-
-
 				//tt.Apply();
 				if (callback != null)
 				{