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/*******************************************************************************************
*
*   raylib [models] example - Load 3d model with animations and play them
*
*   This example has been created using raylib 2.5 (www.raylib.com)
*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
*
*   Copyright (c) 2019 Ramon Santamaria (@raysan5) and @culacant
*
********************************************************************************************/

#include "raylib.h"

#include <stdlib.h>

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

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

// NOTE: Textures MUST be loaded after Window initialization (OpenGL context is required)

Camera camera = { 0 };

Model model = { 0 };
Texture2D texture = { 0 };

Vector3 position = { 0.0f, 0.0f, 0.0f };

// Load animation data
int animsCount = 0;
ModelAnimation *anims = 0;
int animFrameCounter = 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 - model animation");

    // Define the camera to look into our 3d world
    camera.position = (Vector3){ 10.0f, 10.0f, 10.0f }; // Camera position
    camera.target = (Vector3){ 0.0f, 0.0f, 0.0f };      // Camera looking at point
    camera.up = (Vector3){ 0.0f, 1.0f, 0.0f };          // Camera up vector (rotation towards target)
    camera.fovy = 45.0f;                                // Camera field-of-view Y
    camera.type = CAMERA_PERSPECTIVE;                   // Camera mode type

    model = LoadModel("resources/guy/guy.iqm");         // Load the animated model mesh and basic data
    texture = LoadTexture("resources/guy/guytex.png");  // Load model texture and set material
    SetMaterialTexture(&model.materials[0], MAP_DIFFUSE, texture);  // Set model material map texture

    // Load animation data
    anims = LoadModelAnimations("resources/guy/guyanim.iqm", &animsCount);

    SetCameraMode(camera, CAMERA_FREE); // Set free camera mode

#if defined(PLATFORM_WEB)
    emscripten_set_main_loop(UpdateDrawFrame, 60, 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
    //--------------------------------------------------------------------------------------
    UnloadTexture(texture);     // Unload texture

	// Unload model animations data
    for (int i = 0; i < animsCount; i++) UnloadModelAnimation(anims[i]);
    RL_FREE(anims);

    UnloadModel(model);         // Unload model

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

    return 0;
}

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

    // Play animation when spacebar is held down
    if (IsKeyDown(KEY_SPACE))
    {
        animFrameCounter++;
        UpdateModelAnimation(model, anims[0], animFrameCounter);
        if (animFrameCounter >= anims[0].frameCount) animFrameCounter = 0;
    }
    //----------------------------------------------------------------------------------

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

        ClearBackground(RAYWHITE);

        BeginMode3D(camera);

            DrawModelEx(model, position, (Vector3){ 1.0f, 0.0f, 0.0f }, -90.0f, (Vector3){ 1.0f, 1.0f, 1.0f }, WHITE);

            for (int i = 0; i < model.boneCount; i++)
            {
                DrawCube(anims[0].framePoses[animFrameCounter][i].translation, 0.2f, 0.2f, 0.2f, RED);
            }

            DrawGrid(10, 1.0f);         // Draw a grid

        EndMode3D();

        DrawText("PRESS SPACE to PLAY MODEL ANIMATION", 10, 10, 20, MAROON);
        DrawText("(c) Guy IQM 3D model by @culacant", screenWidth - 200, screenHeight - 20, 10, GRAY);

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