#if defined paraboloid_point_shape
	#extension GL_EXT_frag_depth : enable
#endif
#define PI 3.141592653589793



precision highp float;
precision highp int;

/*
#if defined(usePanoMap) 
    
    uniform samplerCube pano0Map;   //随便设置一个samplerCube去使用都会让点云消失
    uniform samplerCube pano1Map;
     
    uniform float progress;
    uniform float easeInOutRatio;

     
    uniform vec3 pano0Position;
    uniform mat4 pano0Matrix; 
    uniform vec3 pano1Position;
    uniform mat4 pano1Matrix;
    varying vec3 vWorldPosition0;
    varying vec3 vWorldPosition1;

#endif 
*/



//------------





uniform mat4 viewMatrix;
uniform mat4 uViewInv;
uniform mat4 uProjInv;
uniform vec3 cameraPosition;


uniform mat4 projectionMatrix;
//uniform float uOpacity;
varying float vOpacity; //add

uniform float blendHardness;
uniform float blendDepthSupplement;
uniform float fov;
uniform float uSpacing;
uniform float near;
uniform float far;
uniform float uPCIndex;
uniform float uScreenWidth;
uniform float uScreenHeight;

varying vec3	vColor;
varying float	vLogDepth;
varying vec3	vViewPosition;
varying float	vRadius;
varying float 	vPointSize;
varying vec3 	vPosition;


float specularStrength = 1.0;


vec2 getSamplerCoord( vec3 direction ) 
{
    direction = normalize(direction);
    float tx=atan(direction.x,-direction.y)/(PI*2.0)+0.5;
    float ty=acos(direction.z)/PI;

    return vec2(tx,ty);
}  




void main() {

    vec3 color = vColor;  
	 
    
    /*#if defined(usePanoMap) //加     经测试，即使全部写在fragment里也是无论pointsize多大都是一个点一个颜色，所以干脆写在vectex里
    
    
        vec4 colorFromPano0=textureCube(pano0Map,vWorldPosition0.xyz);
        vec4 colorFromPano1=textureCube(pano1Map,vWorldPosition1.xyz);
        
        color = mix(colorFromPano0,colorFromPano1,progress).xyz; 
        
        
        //float easeInOutRatio = 0.0;  //缓冲，渐变点云到贴图的颜色 
        if(progress < easeInOutRatio){
            float easeProgress = (easeInOutRatio - progress) / easeInOutRatio; 
            color = mix(color,vColor,easeProgress); 
        }else if(progress > 1.0 - easeInOutRatio){ 
            float easeProgress = (progress - (1.0 - easeInOutRatio) ) / easeInOutRatio; 
            color = mix(color,vColor,easeProgress); 
        }
        
        
    #else 
        color = vColor;
    #endif*/
   
   
    
	float depth = gl_FragCoord.z;

	#if defined(circle_point_shape) || defined(paraboloid_point_shape) 
		float u = 2.0 * gl_PointCoord.x - 1.0;
		float v = 2.0 * gl_PointCoord.y - 1.0;
	#endif
	
	#if defined(circle_point_shape) 
		float cc = u*u + v*v;
		if(cc > 1.0){
			discard;
		}
	#endif
	

 

	
 
    #if defined color_type_indices    //pick point recognize
		gl_FragColor = vec4(color, uPCIndex / 255.0);
	#else
		gl_FragColor = vec4(color, vOpacity);
	#endif
    
    
    
    
    
    
    
    

	#if defined paraboloid_point_shape
		float wi = 0.0 - ( u*u + v*v);
		vec4 pos = vec4(vViewPosition, 1.0);
		pos.z += wi * vRadius;
		float linearDepth = -pos.z;
		pos = projectionMatrix * pos;
		pos = pos / pos.w;
		float expDepth = pos.z;
		depth = (pos.z + 1.0) / 2.0;
		gl_FragDepthEXT = depth;
		
		#if defined(color_type_depth)
			color.r = linearDepth;
			color.g = expDepth;
		#endif
		
		#if defined(use_edl)
			gl_FragColor.a = log2(linearDepth);
		#endif
		
	#else
		#if defined(use_edl)
			gl_FragColor.a = vLogDepth;
		#endif
	#endif

	#if defined(weighted_splats)
		float distance = 2.0 * length(gl_PointCoord.xy - 0.5);
		float weight = max(0.0, 1.0 - distance);
		weight = pow(weight, 1.5);

		gl_FragColor.a = weight;
		gl_FragColor.xyz = gl_FragColor.xyz * weight;
	#endif

	//gl_FragColor = vec4(0.0, 0.7, 0.0, 1.0);
	
}