Added compare options to samplers for shadow sampling. (#83)

* Added compare options to samplers for shadow sampling.

* Corrected comment on BlockingTransferHelper::uploadImage (we do support mip/layer now)

---------

Co-authored-by: petr.kiyashko <petr.kiyashko@gaijin.team>

Author: JackOfBlades232

etna/include/etna/BlockingTransferHelper.hpp

@@ -61,7 +61,7 @@ class BlockingTransferHelper
     OneShotCmdMgr& cmd_mgr, std::span<std::byte> dst, const Buffer& src, std::uint32_t offset);
 
 
-  // NOTE: uploads only mip 0 and layer 0 for now and doesn't support 3D images
+  // NOTE: for now doesn't support 3D images
   void uploadImage(
     OneShotCmdMgr& cmd_mgr,
     Image& dst,

etna/include/etna/Sampler.hpp

@@ -21,6 +21,8 @@ class Sampler
     std::string_view name;
     float minLod = 0.0f;
     float maxLod = VK_LOD_CLAMP_NONE;
+    bool compareEnable = false;
+    vk::CompareOp compareOp = vk::CompareOp::eLessOrEqual;
   };
 
   explicit Sampler(CreateInfo info);

etna/source/Sampler.cpp

@@ -17,9 +17,10 @@ Sampler::Sampler(CreateInfo info)
     .addressModeW = info.addressMode,
     .mipLodBias = 0.0f,
     .maxAnisotropy = 1.0f,
+    .compareEnable = static_cast<vk::Bool32>(info.compareEnable),
+    .compareOp = info.compareOp,
     .minLod = info.minLod,
     .maxLod = info.maxLod,
-    .borderColor = vk::BorderColor::eFloatOpaqueWhite,
   };
   sampler = unwrap_vk_result(etna::get_context().getDevice().createSamplerUnique(createInfo));
   etna::set_debug_name(sampler.get(), info.name.data());