#ifndef _SKY_H
#define _SKY_H

/*=
Sky and environement boxes
1900
**/

// Introduction
/**
Skyboxes are mostly automated.

For now, Raydium will use ##BOXfront.tga##, ##BOXback.tga##, ##BOXleft.tga##,
##BOXright.tga##, ##BOXbottom.tga## and ##BOXtop.tga## and will draw a 
skybox only if fog is disabled (this is not for technical reasons, 
but only for realism, just think about it ;)... but you can force 
skybox with fog using ##raydium_sky_force## if you really want).
**/


__rayapi void raydium_sky_box_cache (void);
/**
As skybox texture are sometimes large files, you can pre-load skybox
with this function. If you don't do it, Raydium will load textures 
during the first frame of your application.
Calling this function will automatically define sky as a HDR emitter.
See HDR chapter for more information.
**/

__rayapi void raydium_sky_box_render (GLfloat x, GLfloat y, GLfloat z);
/**
Internal use.
**/

__rayapi void raydium_sky_sphere_render(GLfloat x, GLfloat y, GLfloat z, int detail);
/**
Internal use.
Calculates and draw the sphere. Also rotate it according the angles or orbit.
**/

//Atmosphere
/**
Atmosphere are series of effects that intend to make the sky and the atmosphere
of the game more realistic. As this is quite-beta state, only a orbital sky 
effect is available right now. 
To activate/deactivate this series of effects, you should use:
##raydium_sky_atmosphere_enable## and ##raydium_sky_atmosphere_disable## 
respectively.
If you need to check if the atmosphere is activated or not, use 
##raydium_sky_atmosphere_check##. The rest of the functions are internal 
and should not used by normal programs.
**/

__rayapi void raydium_sky_atmosphere_enable(void);
/**
turn on the use of atmosphere effects.
This one and _disable function a program should use, the other 
##raydium_sky_atmosphere_## are internal ones.
**/

__rayapi void raydium_sky_atmosphere_disable(void);
/**
turn off the use of atmosphere effects.
**/

__rayapi void raydium_sky_atmosphere_render(GLfloat x, GLfloat y, GLfloat z,int detail);
/**
Internal use. This internal function draws the atmosphere effects. Right 
now only draws a rotating sphere with a gradient of color (from black to white).
In a future, it will draw multiples layers of sky (with and without textures),
stars, satellites... Maybe rain and snow could be included here also.
**/

__rayapi signed char raydium_sky_atmosphere_check(void);
/**
This functions only check if the atmosphere features are been used. 
Returns 1 if they are used, else 0.
**/

#endif