asset_manager.hpp

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#pragma once
 
#include <unordered_map>
#include <string>
#include <memory>
#include <vector>
 
namespace solarsim {
    struct Mesh;
    struct Material;
    struct Shader;

    const std::vector<float> cube = {
        // positions          // normals
        // Front face
        -0.5f, -0.5f,  0.5f,  0.0f,  0.0f,  1.0f,
        0.5f, -0.5f,  0.5f,  0.0f,  0.0f,  1.0f,
        0.5f,  0.5f,  0.5f,  0.0f,  0.0f,  1.0f,
        0.5f,  0.5f,  0.5f,  0.0f,  0.0f,  1.0f,
        -0.5f,  0.5f,  0.5f,  0.0f,  0.0f,  1.0f,
        -0.5f, -0.5f,  0.5f,  0.0f,  0.0f,  1.0f,
 
        // Back face
        -0.5f, -0.5f, -0.5f,  0.0f,  0.0f, -1.0f,
        -0.5f,  0.5f, -0.5f,  0.0f,  0.0f, -1.0f,
        0.5f,  0.5f, -0.5f,  0.0f,  0.0f, -1.0f,
        0.5f,  0.5f, -0.5f,  0.0f,  0.0f, -1.0f,
        0.5f, -0.5f, -0.5f,  0.0f,  0.0f, -1.0f,
        -0.5f, -0.5f, -0.5f,  0.0f,  0.0f, -1.0f,
 
        // Left face
        -0.5f,  0.5f,  0.5f, -1.0f,  0.0f,  0.0f,
        -0.5f,  0.5f, -0.5f, -1.0f,  0.0f,  0.0f,
        -0.5f, -0.5f, -0.5f, -1.0f,  0.0f,  0.0f,
        -0.5f, -0.5f, -0.5f, -1.0f,  0.0f,  0.0f,
        -0.5f, -0.5f,  0.5f, -1.0f,  0.0f,  0.0f,
        -0.5f,  0.5f,  0.5f, -1.0f,  0.0f,  0.0f,
 
        // Right face
        0.5f,  0.5f,  0.5f,  1.0f,  0.0f,  0.0f,
        0.5f, -0.5f, -0.5f,  1.0f,  0.0f,  0.0f,
        0.5f,  0.5f, -0.5f,  1.0f,  0.0f,  0.0f,
        0.5f, -0.5f, -0.5f,  1.0f,  0.0f,  0.0f,
        0.5f,  0.5f,  0.5f,  1.0f,  0.0f,  0.0f,
        0.5f, -0.5f,  0.5f,  1.0f,  0.0f,  0.0f,
 
        // Top face
        -0.5f,  0.5f, -0.5f,  0.0f,  1.0f,  0.0f,
        -0.5f,  0.5f,  0.5f,  0.0f,  1.0f,  0.0f,
        0.5f,  0.5f,  0.5f,  0.0f,  1.0f,  0.0f,
        0.5f,  0.5f,  0.5f,  0.0f,  1.0f,  0.0f,
        0.5f,  0.5f, -0.5f,  0.0f,  1.0f,  0.0f,
        -0.5f,  0.5f, -0.5f,  0.0f,  1.0f,  0.0f,
 
        // Bottom face
        -0.5f, -0.5f, -0.5f,  0.0f, -1.0f,  0.0f,
        0.5f, -0.5f, -0.5f,  0.0f, -1.0f,  0.0f,
        0.5f, -0.5f,  0.5f,  0.0f, -1.0f,  0.0f,
        0.5f, -0.5f,  0.5f,  0.0f, -1.0f,  0.0f,
        -0.5f, -0.5f,  0.5f,  0.0f, -1.0f,  0.0f,
        -0.5f, -0.5f, -0.5f,  0.0f, -1.0f,  0.0f
    };

    class AssetManager {
        public:
            AssetManager(const AssetManager&) = delete;
            AssetManager& operator=(const AssetManager&) = delete;

            static AssetManager& get();

            std::shared_ptr<Mesh> LoadMesh(const std::string& meshID);

            std::shared_ptr<Material> LoadMaterial(const std::string& materialID);

            std::shared_ptr<Shader> LoadShader(const std::string& shaderID);
 
        private:
            std::unordered_map<std::string, std::shared_ptr<Material>> loadedMaterials;
            std::unordered_map<std::string, std::shared_ptr<Mesh>> loadedMeshes;
            std::unordered_map<std::string, std::shared_ptr<Shader>> loadedShaders;

            void generateSphere(std::vector<float>& vertices, std::vector<uint32_t>& indices, float radius=1.0f, int resolution=100);

            void generateGrid(std::vector<float>& vertices, std::vector<uint32_t>& indices, float spacing=20.0f, int extent=100);
 
            AssetManager() {}
            ~AssetManager() {}
    };
}