message: Cull mode for shadow pass
  Fixes
diff: /*
  * Vulkan Example - Shadow mapping for directional light sources
  *
  -* Copyright (C) 2016 by Sascha Willems - www.saschawillems.de
  +* Copyright (C) 2016-2022 by Sascha Willems - www.saschawillems.de
  *
  * This code is licensed under the MIT license (MIT) (http://opensource.org/licenses/MIT)
  */
  @@ -492,7 +492,8 @@ public:
  pipelineCI.stageCount = 1;
  // No blend attachment states (no color attachments used)
  colorBlendStateCI.attachmentCount = 0;
  - // Cull front faces
  + // Disable culling, so all faces contribute to shadows
  + rasterizationStateCI.cullMode = VK_CULL_MODE_NONE;
  depthStencilStateCI.depthCompareOp = VK_COMPARE_OP_LESS_OR_EQUAL;
  // Enable depth bias
  rasterizationStateCI.depthBiasEnable = VK_TRUE;
  