Game Engine Architecture

258 5. Engine Support Systems

(define-exportanim-walk-fast

(new simple-animation

:name "walk"

:speed 2.0

)

)

(define-exportanim-jump

(new simple-animation

:name "jump"

:fade-in-seconds 0.1

:fade-out-seconds 0.1

)

)

This Scheme code would generate the following C/C++ header fi le:

simple-animation.h

// WARNING: This file was automatically generated from

// Scheme. Do not hand-edit.

struct SimpleAnimation

{

const char* m_name;

float m_speed;

float m_fadeInSeconds;

float m_fadeOutSeconds;

};

In-game, the data can be read by calling the LookupSymbol() function, which

is templated on the data type returned, as follows:

#include "simple-animation.h"

void someFunction()

{

SimpleAnimation* pWalkAnim

= LookupSymbol<SimpleAnimation*>("anim-walk");

SimpleAnimation* pFastWalkAnim

= LookupSymbol<SimpleAnimation*>(

" anim-walk-fast");

SimpleAnimation* pJumpAnim

= LookupSymbol<SimpleAnimation*>("anim-jump");

// use the data here...

}