From 0d819f2b9a71e862bce8799c6b0c1304e62219b3 Mon Sep 17 00:00:00 2001
From: hachem <im@hachem.wtf>
Date: Fri, 22 Aug 2025 12:24:05 +0200
Subject: [add]: add HDRI

---
 src/Core/HDRIManager.cpp | 64 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/Core/HDRIManager.h   | 46 ++++++++++++++++++++++++++++++++++
 2 files changed, 110 insertions(+)
 create mode 100644 src/Core/HDRIManager.cpp
 create mode 100644 src/Core/HDRIManager.h

(limited to 'src/Core')

diff --git a/src/Core/HDRIManager.cpp b/src/Core/HDRIManager.cpp
new file mode 100644
index 0000000..6e420a6
--- /dev/null
+++ b/src/Core/HDRIManager.cpp
@@ -0,0 +1,64 @@
+#include "HDRIManager.h"
+#include <filesystem>
+
+namespace Donut
+{
+    Ref<CubemapTexture> HDRIManager::LoadHDRI(const std::string& path)
+    {
+        auto it = m_HDRICache.find(path);
+        if (it != m_HDRICache.end())
+        {
+            DONUT_INFO("HDRI already cached: {}", path);
+            return it->second;
+        }
+
+        DONUT_INFO("Loading HDRI: {}", path);
+        auto hdri = CubemapTexture::CreateFromHDRI(path);
+        
+        if (hdri)
+        {
+            m_HDRICache[path] = hdri;
+            DONUT_INFO("Successfully loaded and cached HDRI: {}", path);
+        }
+        else
+            DONUT_ERROR("Failed to load HDRI: {}", path);
+
+        return hdri;
+    }
+
+    void HDRIManager::SetCurrentHDRI(const std::string& path)
+    {
+        auto hdri = LoadHDRI(path);
+        if (hdri)
+        {
+            m_CurrentHDRI = hdri;
+            DONUT_INFO("Set current HDRI to: {}", path);
+        }
+        else
+            DONUT_ERROR("Failed to set current HDRI: {}", path);
+    }
+
+    std::string HDRIManager::GetHDRIName(const std::string& path) const
+    {
+        std::filesystem::path filePath(path);
+        std::string filename = filePath.stem().string();
+        std::string name = filename;
+        
+        for (size_t i = 0; i < name.length(); ++i)
+        {
+            if (name[i] == '_')
+                name[i] = ' ';
+            else if (i == 0 || name[i-1] == ' ')
+                name[i] = std::toupper(name[i]);
+        }
+        
+        return name;
+    }
+
+    void HDRIManager::ClearCache()
+    {
+        m_HDRICache.clear();
+        m_CurrentHDRI.reset();
+        DONUT_INFO("HDRI cache cleared");
+    }
+};
diff --git a/src/Core/HDRIManager.h b/src/Core/HDRIManager.h
new file mode 100644
index 0000000..ebefb3a
--- /dev/null
+++ b/src/Core/HDRIManager.h
@@ -0,0 +1,46 @@
+#pragma once
+
+#include "Core/Log.h"
+#include "Rendering/Texture.h"
+
+#include <string>
+#include <unordered_map>
+#include <memory>
+
+namespace Donut
+{
+    class HDRIManager
+    {
+    public:
+        static HDRIManager& Get()
+        {
+            static HDRIManager instance;
+            return instance;
+        }
+
+        Ref<CubemapTexture> LoadHDRI(const std::string& path);
+        Ref<CubemapTexture> GetCurrentHDRI() const { return m_CurrentHDRI; }
+        
+        void SetCurrentHDRI(const std::string& path);
+        const std::vector<std::string>& GetAvailableHDRI() const { return m_AvailableHDRI; }
+        std::string GetHDRIName(const std::string& path)   const;
+        void ClearCache();
+    private:
+         HDRIManager() = default;
+        ~HDRIManager() = default;
+
+        HDRIManager(const HDRIManager&)            = delete;
+        HDRIManager& operator=(const HDRIManager&) = delete;
+
+        std::unordered_map<std::string, Ref<CubemapTexture>> m_HDRICache;
+        
+        Ref<CubemapTexture> m_CurrentHDRI;
+        
+        std::vector<std::string> m_AvailableHDRI = 
+        {
+            "Assets/HDRI/HDR_blue_nebulae-1.hdr",
+            "Assets/HDRI/HDR_subdued_blue_nebulae.hdr",
+            "Assets/HDRI/HDR_subdued_multi_nebulae.hdr"
+        };
+    };
+};
-- 
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