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

#include "raylib.h"

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
    Camera camera = [[ 1.0, 1.0, 1.0 ], [ 0.0, 0.0, 0.0 ], [ 0.0, 1.0, 0.0 ], 45.0, 0 ]

    # Load skybox model
    Mesh cube = GenMeshCube(1.0, 1.0, 1.0)
    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"), (int[1])[ 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"), (int[1])[ 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[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, 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(&camera)              # Update camera
        #----------------------------------------------------------------------------------

        # Draw
        #----------------------------------------------------------------------------------
        BeginDrawing()

            ClearBackground(RAYWHITE)

            BeginMode3D(camera)

                DrawModel(skybox, (Vector3)[0, 0, 0], 1.0, WHITE)
                
                DrawGrid(10, 1.0)

            EndMode3D()

            DrawFPS(10, 10)

        EndDrawing()
        #----------------------------------------------------------------------------------
    ]

    # De-Initialization
    #--------------------------------------------------------------------------------------
    UnloadModel(skybox)        # Unload skybox model (and textures)

    CloseWindow()              # Close window and OpenGL context
    #--------------------------------------------------------------------------------------

    return 0
]