//
//  GLKEffectPropertyFog.h
//  GLKit
//
//  Copyright (c) 2011-2012 Apple Inc. All rights reserved.
//

#import <GLKit/GLKEffectProperty.h>

// Fog modes per the OpenGL ES 1.1 specification
typedef NS_ENUM(GLint, GLKFogMode)
{
    GLKFogModeExp=0,
    GLKFogModeExp2,
    GLKFogModeLinear
} NS_ENUM_AVAILABLE(10_8, 5_0);


/*
 GLKEffectPropertyFog

 GLKEffectPropertyFog allows specification of fog parameters and operation per the OpenGL ES 1.1 specification.
 Fog properties may be enabled or disabled through their enabled property.

 The default values of the properties of this class are as follows:

      enabled         GL_TRUE
      mode            GLKFogModeExp
      color           { 0.0, 0.0, 0.0, 0.0 }
      density         1.0
      start           0.0
      end             1.0
*/ 

@interface GLKEffectPropertyFog : GLKEffectProperty 
{
    @private
    
    GLboolean     _enabled;    // Switch fog on or off
    GLint         _mode;       // GLKFogMode as defined above
    GLKVector4    _color;      // Fog color
    GLfloat       _density;    // Fog density
    GLfloat       _start;      // Fog start boundary for GLKFogModeLinear
    GLfloat       _end;        // Fog end boundary for GLKFogModeLinear    
}

// Properties                                              // Default Value
@property (nonatomic, assign)    GLboolean     enabled;    // GL_FALSE
@property (nonatomic, assign)    GLint         mode;       // GLKFogModeExp
@property (nonatomic, assign)    GLKVector4    color;      // { 0.0, 0.0, 0.0, 0.0 }
@property (nonatomic, assign)    GLfloat       density;    // 1.0
@property (nonatomic, assign)    GLfloat       start;      // 0.0
@property (nonatomic, assign)    GLfloat       end;        // 1.0

@end