message: Raise sampler limit to 16.
  In practice this limits materials to 10 samplers since Filament uses 5
  for lights and skips 1 slot for the post-process sampler. This can
  probably be optimized.
diff: @@ -51,7 +51,7 @@ static_assert(BindingPoints::PER_MATERIAL_INSTANCE == BindingPoints::COUNT - 1,
  constexpr uint32_t ATTRIBUTE_INDEX_COUNT = 7;
  constexpr size_t MAX_ATTRIBUTE_BUFFERS_COUNT = 8; // FIXME: should match Driver::MAX_ATTRIBUTE_BUFFER_COUNT
  -constexpr size_t MAX_SAMPLER_COUNT = 8;
  +constexpr size_t MAX_SAMPLER_COUNT = 16; // Matches the Adreno Vulkan driver.
  // This value is limited by UBO size, ES3.0 only guarantees 16 KiB.
  // Values <= 256, use less CPU and GPU resources.
  