Resources are a main part of any game and ClanLib has a system that makes resources easy to use

Resources are a main part of any game and ClanLib has a system that makes resources easy to use. Let’s go back to the code from the first tutorial and modify it so that it uses resources.

First I will create a file “resources.scr” which contains the following

    section Surfaces

    {

                            my_surface = clanlib.tga (type=surface);

    }

The Resource Overview provides a good explanation of how to create a resource file but I will cover some basics here

    section Surfaces

You can separate your resources into different sections for easier organization. Sections may also have subsections.

    my_surface = clanlib.tga (type=surface);

Creates a resource called my_surface.

//main.h – has the definition for our main clanapp class

#include <ClanLib/core.h>

#include <ClanLib/application.h>

#include <ClanLib/display.h>

#include <ClanLib/gl.h>

class SimpleApp : public CL_ClanApplication

{

virtual int main(int, char**);

};

In main.h we will add a line defining a CL_ResourceManager who’s main job is to load resources and make them available to objects such as a CL_Surface

//main.cpp

#include “main.h”

int SimpleApp::main(int argc, char **argv)

{

//we need to set up all the different pieces

CL_SetupCore::init();

CL_SetupApplication::init();

CL_SetupDisplay::init();

CL_SetupGL::init();

//We need to create a window so people can see what we’re doing

CL_DisplayWindow window("A Simple ClanLib App", 640, 480, false, true);

//Tell Clanlib that we will be drawing in 2D

CL_Display::begin_2d();

CL_ResourceManager *myResourceManager = new CL_ResourceManager(“resources.scr”, false);

//Create a CL_Surface that we will load from file.

CL_Surface *Image = new CL_Surface(“Surfaces\my_Surfaces”, myResourceManager );

//let’s start our while loop and draw on the screen

//If escape was hit, we should quit

while(!CL_Keyboard::get_keycode(CL_KEY_ESCAPE))

{

//clear the screen to black

CL_Display::clear();

//Draw our image on the screen

Image->draw(150, 150);

//flip our screen so it draws it to the front buffer

CL_Display::flip();

//call keep_alive, the most important call in any loop

CL_System::keep_alive();

}

delete Image;

delete myResourceManager;

//Tell Clanlib that we are done drawing in 2D

CL_Display::end_2d();

CL_SetupCore::deinit();

CL_SetupApplication::deinit();

CL_SetupDisplay::deinit();

CL_SetupGL::deinit();

return 0;

}

SimpleApp app;

//Create and setup our resource manager to look at a file named “resources.scr”

myResourceManager = new CL_ResourceManager(“resources.scr”, false);

This creates a CL_ResourceManager that will load and parse the file “resources.scr”. This file is not a compressed file which is what the false parameter is.

Compressed files hold the resources and usually have the extension .dat files. Non-compressed files commonly have .scr extensions.

//Create a CL_Surface that we will load from file.

CL_Surface *Image = new CL_Surface(“Surfaces\my_Surfaces”, myResourceManager );

We load our surface now from the CL_ResourceManager instead of directly from disk. This specifies that we want to load the my_Surfaces CL_Surface from the Surfaces section.

Next we will do Sprites…