raylib-cs/Examples/Models/SkyboxDemo.cs

/*******************************************************************************************
*
*   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)
*
********************************************************************************************/

using System.Numerics;
using static Raylib_cs.Raylib;

namespace Examples.Models;

public class SkyboxDemo
{
    public static int Main()
    {
        // Initialization
        //--------------------------------------------------------------------------------------
        const int screenWidth = 800;
        const 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();
        camera.Position = new Vector3(1.0f, 1.0f, 1.0f);
        camera.Target = new Vector3(4.0f, 1.0f, 4.0f);
        camera.Up = new Vector3(0.0f, 1.0f, 0.0f);
        camera.FovY = 45.0f;
        camera.Projection = CameraProjection.CAMERA_PERSPECTIVE;

        // 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
        Shader shader = LoadShader("resources/shaders/glsl330/skybox.vs", "resources/shaders/glsl330/skybox.fs");
        Raylib.SetMaterialShader(ref skybox, 0, ref shader);
        Raylib.SetShaderValue(
            shader,
            GetShaderLocation(shader, "environmentMap"),
            (int)MaterialMapIndex.MATERIAL_MAP_CUBEMAP,
            ShaderUniformDataType.SHADER_UNIFORM_INT
        );
        Raylib.SetShaderValue(
            shader,
            GetShaderLocation(shader, "vflipped"),
            1,
            ShaderUniformDataType.SHADER_UNIFORM_INT
        );

        // Load cubemap shader and setup required shader locations
        Shader shdrCubemap = LoadShader(
            "resources/shaders/glsl330/cubemap.vs",
            "resources/shaders/glsl330/cubemap.fs"
        );
        Raylib.SetShaderValue(
            shdrCubemap,
            GetShaderLocation(shdrCubemap, "equirectangularMap"),
            0,
            ShaderUniformDataType.SHADER_UNIFORM_INT
        );

        // Load HDR panorama (sphere) texture
        string panoFileName = "resources/dresden_square_2k.hdr";
        Texture2D panorama = LoadTexture(panoFileName);

        // 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
        // Texture2D cubemap = PBR.GenTextureCubemap(shdrCubemap, panorama, 1024, PIXELFORMAT_UNCOMPRESSED_R8G8B8A8);
        // Raylib.SetMaterialTexture(ref skybox, 0, MaterialMapIndex.MATERIAL_MAP_CUBEMAP, ref cubemap);
        // Texture not required anymore, cubemap already generated
        UnloadTexture(panorama);

        SetTargetFPS(60);
        //--------------------------------------------------------------------------------------

        // Main game loop
        while (!WindowShouldClose())
        {
            // Update
            //----------------------------------------------------------------------------------
            UpdateCamera(ref camera, CameraMode.CAMERA_FIRST_PERSON);

            // Load new cubemap texture on drag & drop
            if (IsFileDropped())
            {
                string[] files = Raylib.GetDroppedFiles();

                if (files.Length == 1)
                {
                    if (IsFileExtension(files[0], ".png;.jpg;.hdr;.bmp;.tga"))
                    {
                        // Unload cubemap texture and load new one
                        UnloadTexture(Raylib.GetMaterialTexture(ref skybox, 0, MaterialMapIndex.MATERIAL_MAP_CUBEMAP));
                        panorama = LoadTexture(files[0]);
                        panoFileName = files[0];

                        // Generate cubemap from panorama texture
                        // cubemap = PBR.GenTextureCubemap(shdrCubemap, panorama, 1024, PIXELFORMAT_UNCOMPRESSED_R8G8B8A8);
                        // Raylib.SetMaterialTexture(ref skybox, 0, MaterialMapIndex.MATERIAL_MAP_CUBEMAP, ref cubemap);
                        UnloadTexture(panorama);
                    }
                }
            }
            //----------------------------------------------------------------------------------

            // Draw
            //----------------------------------------------------------------------------------
            BeginDrawing();
            ClearBackground(Color.RAYWHITE);

            BeginMode3D(camera);
            DrawModel(skybox, new Vector3(0, 0, 0), 1.0f, Color.WHITE);
            DrawGrid(10, 1.0f);
            EndMode3D();

            DrawFPS(10, 10);
            EndDrawing();
            //----------------------------------------------------------------------------------
        }

        // De-Initialization
        //--------------------------------------------------------------------------------------
        UnloadModel(skybox);

        CloseWindow();
        //--------------------------------------------------------------------------------------

        return 0;
    }
}