reduce allocations

Author: riccardobl

jme3-ios/src/main/java/com/jme3/renderer/ios/IosGL.java

@@ -84,6 +84,23 @@ private static void checkLimit(Buffer buffer) {
             throw new RendererException("Attempting to upload empty buffer (remaining = 0), that's an error");
         }
     }
+
+    private byte[] stringToCAscii(String value) {
+        if (tempByteArray.length < value.length() + 1) {
+            tempByteArray = new byte[value.length() + 1];
+        }
+
+        for (int i = 0; i < value.length(); i++) {
+            char ch = value.charAt(i);
+            if (ch > 0x7f) {
+                throw new IllegalArgumentException("GL names must be ASCII");
+            }
+            tempByteArray[i] = (byte) ch;
+        }
+
+        tempByteArray[value.length()] = 0;
+        return tempByteArray;
+    }
 
     @Override
     public void glActiveTexture(int texture) {
@@ -328,13 +345,7 @@ public void glGenQueries(int num, IntBuffer buff) {
 
     @Override
     public int glGetAttribLocation(int program, String name) {
-        byte[] bytes = name.getBytes(StandardCharsets.UTF_8);
-        if (tempByteArray.length < bytes.length + 1) {
-            tempByteArray = new byte[bytes.length + 1];
-        }
-        System.arraycopy(bytes, 0, tempByteArray, 0, bytes.length);
-        tempByteArray[bytes.length] = 0;
-        return GLES.glGetAttribLocation(program, tempByteArray);
+        return GLES.glGetAttribLocation(program, stringToCAscii(name));
     }
 
     @Override
@@ -465,13 +476,7 @@ public String glGetString(int name) {
 
     @Override
     public int glGetUniformLocation(int program, String name) {
-        byte[] bytes = name.getBytes(StandardCharsets.UTF_8);
-        if (tempByteArray.length < bytes.length + 1) {
-            tempByteArray = new byte[bytes.length + 1];
-        }
-        System.arraycopy(bytes, 0, tempByteArray, 0, bytes.length);
-        tempByteArray[bytes.length] = 0;
-        return GLES.glGetUniformLocation(program, tempByteArray);
+        return GLES.glGetUniformLocation(program, stringToCAscii(name));
     }
 
     @Override