#ifdef OPENGL_ES
#ifdef GL_FRAGMENT_PRECISION_HIGH
precision highp float;
#else
precision mediump float;
#endif
#endif

///////////////////////////////////////////////////////////
// Uniforms
uniform sampler2D u_texture;

///////////////////////////////////////////////////////////
// Varyings
varying vec2 v_texCoord;
varying vec4 v_color;


// alphareject
#if defined(TEXTURE_DISCARD_ALPHA)
uniform float u_alphaReject;
#endif

#if defined(MODULATE_COLOR)
uniform vec3 u_modulateColor;
#endif

#if defined(ADDITIVE_COLOR)
uniform vec3 u_additiveColor;
#endif

#if defined(BLEND_COLOR)
uniform vec4 u_blendColor;
#endif

#if defined(MODULATE_ALPHA)
uniform float u_modulateAlpha;
#endif

uniform vec4 u_fogcolor;
uniform vec4 u_fogparam; // .x, .y, .z, .w stand for fog density, fog start, fog end, fog type. fog type 0, no fog, fog type 1 linear fog, fog type 2 exp fog, fog type 3 exp2 fog
varying float v_fogFactor;              //fog factor


void main()
{
    gl_FragColor = v_color * texture2D(u_texture, v_texCoord);

    #if defined(TEXTURE_DISCARD_ALPHA)
	if (gl_FragColor.a < u_alphaReject)
		discard;
    #endif

		
    #if defined(MODULATE_COLOR)
		gl_FragColor.rgb *= u_modulateColor;
    #endif

    #if defined(ADDITIVE_COLOR)
		gl_FragColor.rgb += u_additiveColor;
    #endif

    #if defined(BLEND_COLOR)
		gl_FragColor.rgb = mix(gl_FragColor.rgb , u_blendColor.rgb , u_blendColor.a);
    #endif

    #if defined(MODULATE_ALPHA)
		gl_FragColor.a *= u_modulateAlpha;
    #endif

	#if defined(FOG)
	gl_FragColor.rgb = mix(u_fogcolor.rgb, gl_FragColor.rgb, v_fogFactor);
	#endif
}