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src/ui/IconManager.h

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+#pragma once
+
+#include <imgui.h>
+#include <string>
+#include <unordered_map>
+
+namespace UsdLayerManager {
+
+/// Symbolic icon names used throughout the UI.
+enum class Icon {
+    // Visibility
+    Eye,
+    EyeSlash,
+    // Reference state
+    Link,
+    LinkSlash,
+    // Prim types
+    Globe,        // PseudoRoot / World
+    Cube,         // Mesh / Subdiv
+    Camera,
+    Lightbulb,    // Light
+    FolderOpen,   // Scope
+    ObjectGroup,  // Xform
+    Swatchbook,   // Material
+    Code,         // Shader
+    LayerGroup,   // Model
+    CircleDot,    // Generic prim
+    // Viewport manipulator tools
+    ToolSelect,   // cursor / arrow-pointer
+    ToolMove,     // four-directional arrows
+    ToolRotate,   // circular arrows
+    ToolScale,    // expand/compress arrows
+    // Viewport display toggles
+    WorldSpace,   // globe / world coordinate space
+    LocalSpace,   // coordinate axes / local object space
+    Grid,         // ground grid toggle
+    Antialias,    // anti-aliasing toggle
+    // Viewport layout modes
+    LayoutSingle, // single viewport
+    LayoutHSplit, // two panels side-by-side
+    LayoutVSplit, // two panels top/bottom
+    LayoutQuad,   // four panels 2×2
+};
+
+/// Loads SVG files from disk, rasterizes them with NanoSVG, uploads them as
+/// OpenGL textures, and hands out ImTextureID handles for use with
+/// ImGui::Image() / ImGui::ImageButton().
+///
+/// Lifecycle: Initialize() after OpenGL is ready, Shutdown() before context
+/// is destroyed.  One global instance is owned by Application.
+class IconManager {
+public:
+    IconManager();
+    ~IconManager();
+
+    /// Load and rasterize all icons from the given directory.
+    /// @param iconDir   Path to the directory containing the .svg files.
+    /// @param sizePixels Rasterisation size in pixels (both axes).
+    bool Initialize(const std::string& iconDir, int sizePixels = 16);
+
+    /// Release all GPU textures.
+    void Shutdown();
+
+    /// Return the ImTextureID for the given icon.
+    /// Returns a 1×1 transparent fallback texture when the icon is missing.
+    ImTextureID Get(Icon icon) const;
+
+    /// Pixel size the icons were rasterised at.
+    int SizePixels() const { return m_sizePixels; }
+    ImVec2 SizeVec() const { return ImVec2(static_cast<float>(m_sizePixels),
+                                           static_cast<float>(m_sizePixels)); }
+
+private:
+    bool LoadSVG(Icon icon, const std::string& path);
+    void CreateFallback();
+
+    int m_sizePixels = 16;
+    ImTextureID m_fallback = ImTextureID_Invalid;
+    std::unordered_map<int, ImTextureID> m_textures; // key = (int)Icon
+};
+
+} // namespace UsdLayerManager