ADD: IBL added

src/core/ibl_manager.h

@@ -8,18 +8,17 @@ class EngineContext;
 struct IBLPaths
 {
     std::string specularCube; // .ktx2 (GPU-ready BC6H or R16G16B16A16)
-    std::string diffuseCube;  // .ktx2
-    std::string brdfLut2D;    // .ktx2 (BC5 RG UNORM or similar)
+    std::string diffuseCube; // .ktx2
+    std::string brdfLut2D; // .ktx2 (BC5 RG UNORM or similar)
 };
 
-// Minimal IBL asset owner with optional residency control.
 class IBLManager
 {
 public:
-    void init(EngineContext* ctx) { _ctx = ctx; }
+    void init(EngineContext *ctx) { _ctx = ctx; }
 
     // Load all three textures. Returns true when specular+diffuse (and optional LUT) are resident.
-    bool load(const IBLPaths& paths);
+    bool load(const IBLPaths &paths);
 
     // Release GPU memory and patch to fallbacks handled by the caller.
     void unload();
@@ -27,13 +26,22 @@ public:
     bool resident() const { return _spec.image != VK_NULL_HANDLE || _diff.image != VK_NULL_HANDLE; }
 
     AllocatedImage specular() const { return _spec; }
-    AllocatedImage diffuse()  const { return _diff; }
-    AllocatedImage brdf()     const { return _brdf; }
+    AllocatedImage diffuse() const { return _diff; }
+    AllocatedImage brdf() const { return _brdf; }
+    AllocatedBuffer shBuffer() const { return _shBuffer; }
+    bool hasSH() const { return _shBuffer.buffer != VK_NULL_HANDLE; }
+
+    // Descriptor set layout used by shaders (set=3)
+    VkDescriptorSetLayout descriptorLayout() const { return _iblSetLayout; }
+
+    // Build descriptor set layout without loading images (for early pipeline creation)
+    bool ensureLayout();
 
 private:
-    EngineContext* _ctx{nullptr};
+    EngineContext *_ctx{nullptr};
     AllocatedImage _spec{};
     AllocatedImage _diff{};
     AllocatedImage _brdf{};
+    VkDescriptorSetLayout _iblSetLayout = VK_NULL_HANDLE;
+    AllocatedBuffer _shBuffer{}; // 9*vec4 coefficients (RGB in .xyz)
 };
-