using Raylib;
using static Raylib.Raylib;
using static Raylib.CameraMode;
using static Raylib.TexmapIndex;

public partial class models_skybox
{
    /*******************************************************************************************
    *
    *   raylib [models] example - Skybox loading and drawing
    *
    *   This example has been created using raylib 1.8 (www.raylib.com)
    *   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
    *
    *   Copyright (c) 2017 Ramon Santamaria (@raysan5)
    *
    ********************************************************************************************/
    
    
    public static int Main()
    {
        // Initialization
        //--------------------------------------------------------------------------------------
        int screenWidth = 800;
        int screenHeight = 450;
    
        InitWindow(screenWidth, screenHeight, "raylib [models] example - skybox loading and drawing");
    
        // Define the camera to look into our 3d world
        Camera3D camera = new Camera3D(new Vector3( 1.0f, 1.0f, 1.0f ), new Vector3( 0.0f, 0.0f, 0.0f ), new Vector3( 0.0f, 1.0f, 0.0f ), 45.0f, 0 );
    
        // Load skybox model   
        Mesh cube = GenMeshCube(1.0f, 1.0f, 1.0f);
        Model skybox = LoadModelFromMesh(cube);
        
        // Load skybox shader and set required locations
        // NOTE: Some locations are automatically set at shader loading
        skybox.material.shader = LoadShader("resources/shaders/skybox.vs", "resources/shaders/skybox.fs");
        SetShaderValuei(skybox.material.shader, GetShaderLocation(skybox.material.shader, "environmentMap"), new int[]{ (int)MAP_CUBEMAP }, 1);
    
        // Load cubemap shader and setup required shader locations
        Shader shdrCubemap = LoadShader("resources/shaders/cubemap.vs", "resources/shaders/cubemap.fs");
        SetShaderValuei(shdrCubemap, GetShaderLocation(shdrCubemap, "equirectangularMap"), new int[]{ 0 }, 1);
        
        // Load HDR panorama (sphere) texture
        Texture2D texHDR = LoadTexture("resources/dresden_square.hdr");
        
        // Generate cubemap (texture with 6 quads-cube-mapping) from panorama HDR texture
        // NOTE: New texture is generated rendering to texture, shader computes the sphre->cube coordinates mapping
        skybox.material.maps[(int)MAP_CUBEMAP].texture = GenTextureCubemap(shdrCubemap, texHDR, 512);
        
        UnloadTexture(texHDR);      // Texture not required anymore, cubemap already generated
        UnloadShader(shdrCubemap);  // Unload cubemap generation shader, not required anymore
        
        SetCameraMode(camera, (int)CAMERA_FIRST_PERSON);  // Set a first person camera mode
    
        SetTargetFPS(60);                       // Set our game to run at 60 frames-per-second
        //--------------------------------------------------------------------------------------
    
        // Main game loop
        while (!WindowShouldClose())            // Detect window close button or ESC key
        {
            // Update
            //----------------------------------------------------------------------------------
            UpdateCamera(ref camera);              // Update camera
            //----------------------------------------------------------------------------------
    
            // Draw
            //----------------------------------------------------------------------------------
            BeginDrawing();
    
                ClearBackground(RAYWHITE);
    
                BeginMode3D(camera);
    
                    DrawModel(skybox, new Vector3(0, 0, 0), 1.0f, WHITE);
                    
                    DrawGrid(10, 1.0f);
    
                EndMode3D();
    
                DrawFPS(10, 10);
    
            EndDrawing();
            //----------------------------------------------------------------------------------
        }
    
        // De-Initialization
        //--------------------------------------------------------------------------------------
        UnloadModel(skybox);        // Unload skybox model (and textures)
    
        CloseWindow();              // Close window and OpenGL context
        //--------------------------------------------------------------------------------------
    
        return 0;
    }      
}