Add ray-query hard shadow: TLAS/BLAS, descriptors and shader path

[fl0a1e]

Motivation

• Provide a minimal, non-intrusive path to compute hard shadows for the directional light using Vulkan Ray Query and acceleration structures.
• Enable required device extensions/features (buffer device address, acceleration structures, ray query) and build a static TLAS from the existing scene geometry for shader ray queries.

Description

• Enable device extensions in instance/device setup (GlfwGeneral.hpp) and enable the feature chain (VkPhysicalDeviceRayQueryFeaturesKHR → VkPhysicalDeviceAccelerationStructureFeaturesKHR → VkPhysicalDeviceBufferDeviceAddressFeatures) by attaching to VkDeviceCreateInfo::pNext (vkBase.h).
• Add a lightweight AS builder module RayTracingAS.hpp/.cpp that builds per-mesh BLAS and a single TLAS (static build, no per-frame updates) and exposes SceneAS::Tlas().
• Integrate TLAS into the lighting pass by adding a TLAS binding (binding = 9, VK_DESCRIPTOR_TYPE_ACCELERATION_STRUCTURE_KHR) to the lighting descriptor set layout/pool and updating UpdateLightingDescriptorSet() to write the TLAS while preserving all existing gbuffer/shadow/light bindings (main.cpp).
• Make geometry buffers shader-device-address capable and allocate with device-address flags so AS build can use device addresses, and add vertexCount tracking for BLAS inputs (main.cpp).
• Add CreateRayTracingAS() and call it after scene resources are created, and destroy the AS on exit (main.cpp).
• Shader changes in shaders/lighting.ps.hlsl: add [[vk::binding(9, 0)]] RaytracingAccelerationStructure sceneTLAS;, implement a RayQuery-based hard shadow function with a normal bias to avoid self-shadow acne, and guard it behind USE_RAYQUERY_SHADOW to allow A/B testing and fallback to the original shadow-map path.
• Add new files to the VS project and filters (easy_vulkan.vcxproj / .filters).

Testing

• Ran repository checks including git diff --check and git status which passed locally after edits and the change was committed (add ray query hard shadow path).
• Verified source-level integration via text search/inspection of modified files to ensure descriptor, feature, and shader wiring are present.
• Attempted to build with msbuild easy_vulkan.sln /p:Configuration=Debug /p:Platform=x64 but the container does not provide msbuild, so a full Visual Studio build could not be executed here; please build and run the project in Visual Studio 2022+ with the Vulkan SDK to validate runtime behavior and shader compilation.

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Codex Task