/*******************************************************************************************
*
*   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"

#if defined(PLATFORM_WEB)
    #include <emscripten/emscripten.h>
#endif

//----------------------------------------------------------------------------------
// Global Variables Definition
//----------------------------------------------------------------------------------
const int screenWidth = 800;
const int screenHeight = 450;

// Define the camera to look into our 3d world
Camera camera = {{ 1.0f, 1.0f, 1.0f }, { 0.0f, 0.0f, 0.0f }, { 0.0f, 1.0f, 0.0f }, 45.0f };

Model skybox = { 0 };

//----------------------------------------------------------------------------------
// Module Functions Declaration
//----------------------------------------------------------------------------------
void UpdateDrawFrame(void);     // Update and Draw one frame

//----------------------------------------------------------------------------------
// Program Main Entry Point
//----------------------------------------------------------------------------------
int main(void)
{
    // Initialization
    //--------------------------------------------------------------------------------------
    InitWindow(screenWidth, screenHeight, "raylib [models] example - skybox loading and drawing");

    // Load skybox model
    Mesh cube = GenMeshCube(1.0f, 1.0f, 1.0f);
    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);

    Texture2D texHDR = LoadTexture("resources/pinetree.hdr");
    skybox.material.maps[MAP_CUBEMAP].texture = GenTextureCubemap(shdrCubemap, texHDR, 512);

    UnloadShader(shdrCubemap);  // Cubemap generation shader not required any more

    SetCameraMode(camera, CAMERA_ORBITAL);  // Set an orbital camera mode

#if defined(PLATFORM_WEB)
    emscripten_set_main_loop(UpdateDrawFrame, 0, 1);
#else
    SetTargetFPS(60);   // Set our game to run at 60 frames-per-second
    //--------------------------------------------------------------------------------------

    // Main game loop
    while (!WindowShouldClose())    // Detect window close button or ESC key
    {
        UpdateDrawFrame();
    }
#endif

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

    CloseWindow();              // Close window and OpenGL context
    //--------------------------------------------------------------------------------------

    return 0;
}

//----------------------------------------------------------------------------------
// Module Functions Definition
//----------------------------------------------------------------------------------
void UpdateDrawFrame(void)
{
    // Update
    //----------------------------------------------------------------------------------
    UpdateCamera(&camera);              // Update camera
    //----------------------------------------------------------------------------------

    // Draw
    //----------------------------------------------------------------------------------
    BeginDrawing();

        ClearBackground(RAYWHITE);

        BeginMode3D(camera);

            DrawModel(skybox, Vector3Zero(), 1.0f, WHITE);

            DrawGrid(10, 1.0f);

        EndMode3D();

        DrawFPS(10, 10);

    EndDrawing();
    //----------------------------------------------------------------------------------
}