Update sort for small splat count (#420)

* Update splat sort for small splat count

Author: mkkellogg

src/worker/compile_wasm_no_simd.sh

@@ -1 +1 @@
-em++ -std=c++11 sorter_no_simd.cpp -Os -s WASM=1 -s SIDE_MODULE=2 -o sorter_no_simd.wasm -s IMPORTED_MEMORY=1 -s SHARED_MEMORY=1
+em++ -std=c++11 sorter_no_simd.cpp -Os -s WASM=1 -s SIDE_MODULE=2 -o sorter_no_simd.wasm -s IMPORTED_MEMORY=1 -s USE_PTHREADS=1

src/worker/sorter.cpp

@@ -24,6 +24,8 @@ EXTERN EMSCRIPTEN_KEEPALIVE void sortIndexes(unsigned int* indexes, void* center
     int maxDistance = -2147483640;
     int minDistance = 2147483640;
 
+    if (distanceMapRange > sortCount) distanceMapRange = sortCount;
+
     float fMVPTRow3[4]; 
     unsigned int sortStart = renderCount - sortCount;
     if (useIntegerSort) {

src/worker/sorter.wasm

@@ -23,6 +23,8 @@ EXTERN EMSCRIPTEN_KEEPALIVE void sortIndexes(unsigned int* indexes, void* center
     int maxDistance = -2147483640;
     int minDistance = 2147483640;
 
+    if (distanceMapRange > sortCount) distanceMapRange = sortCount;
+
     float fMVPTRow3[4];
     int iMVPTRow3[4];
     unsigned int sortStart = renderCount - sortCount;