add shader optimizer and reorder components

src/geometry/text_buffer.cpp

@@ -19,10 +19,13 @@ size_t TextVertexBuffer::add(int16_t x, int16_t y, float ox, float oy, uint16_t
     shorts[3] = round(oy * 64);
 
     uint8_t *ubytes = static_cast<uint8_t *>(data);
+    // a_data1
     ubytes[8] = tx / 4;
     ubytes[9] = ty / 4;
     ubytes[10] = labelminzoom * 10;
     ubytes[11] = minzoom * 10; // 1/10 zoom levels: z16 == 160.
+
+    // a_data2
     ubytes[12] = fmin(maxzoom, 25) * 10; // 1/10 zoom levels: z16 == 160.
     ubytes[13] = (int16_t)round(angle * angleFactor) % 256;
     ubytes[14] = util::max((int16_t)round(range[0] * angleFactor), (int16_t)0) % 256;