precision highp float;
precision highp int;

#define PI 3.141592653589793

attribute vec3 position;

// DYNAMIC LIST OF ATTRIBUTES IN USE
#define NUM_ATTRIBUTES

attribute float attribute_0;

uniform float uAttribute_w[NUM_ATTRIBUTES];      // composite weight
uniform vec3  uAttribute_gbc[NUM_ATTRIBUTES];    // gamma, brightness, contrast
uniform vec2  uAttribute_range[NUM_ATTRIBUTES];  // 

// filter



uniform mat4 modelMatrix;
uniform mat4 modelViewMatrix;
uniform mat4 projectionMatrix;
uniform mat4 viewMatrix;
uniform mat4 uViewInv;

uniform sampler2D gradient;
uniform sampler2D classificationLUT;

varying vec3 vColor;

vec4 getColor(float value, int index){

	vec2 range = uAttribute_range[index];
	vec3 gbc = uAttribute_gbc[index];
	float gamma = gbc.x;
	float brightness = gbc.y;
	float contrast = gbc.z;

	float w = (intensity - range.x) / (range.y - range.x);
	w = pow(w, gamma);
	w = w + brightness;
	w = (w - 0.5) * getContrastFactor(contrast) + 0.5;
	w = clamp(w, 0.0, 1.0);

	return w;
}

vec4 getColor(vec4 value, int index){

	vec4 color = value;

	vec3 gbc = uAttribute_gbc[index];
	float gamma = gbc.x;
	float brightness = gbc.y;
	float contrast = gbc.z;

	color = pow(color, vec3(gamma));
	color = color + brightness;
	color = (color - 0.5) * getContrastFactor(contrast) + 0.5;
	color = clamp(color, 0.0, 1.0);

	return color;
}

vec4 getColor(){

	

}


void main() {
	vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );

	gl_Position = projectionMatrix * mvPosition;

	gl_PointSize = 2.0;

	// COLOR
	vColor = getColor();

}