message: Repair FeedbackLoops test.
diff: @@ -47,7 +47,11 @@ void main() {
  static std::string fullscreenFs = R"(#version 450 core
  precision mediump int; precision highp float;
  layout(location = 0) out vec4 fragColor;
  -layout(location = 0) uniform sampler2D tex;
  +
  +// Filament's Vulkan backend requires a descriptor set index of 1 for all samplers.
  +// This parameter is ignored for other backends.
  +layout(location = 0, set = 1) uniform sampler2D tex;
  +
  uniform Params {
  highp float fbWidth;
  highp float fbHeight;
  @@ -144,7 +148,7 @@ TEST_F(BackendTest, FeedbackLoops) {
  // Create a RenderTarget for each miplevel.
  Handle<HwRenderTarget> renderTargets[kNumLevels];
  for (uint8_t level = 0; level < kNumLevels; level++) {
  - slog.i << "Level " << level << ": " <<
  + slog.i << "Level " << int(level) << ": " <<
  (kTexWidth >> level) << "x" << (kTexHeight >> level) << io::endl;
  renderTargets[level] = api.createRenderTarget( TargetBufferFlags::COLOR,
  kTexWidth >> level, kTexHeight >> level, 1, { texture, level, 0 }, {}, {});
  