3d-core-raub/js/objects/points.js

An extensible Node3D core for desktop applications

'use strict';

const Cloud = require('./cloud');


class Points extends Cloud {
	
	
	constructor(opts) {
		
		super(opts);
		
	}
	
	
	buildVert(opts) {
		return opts.vert || `
			${
	opts.attrs.size
		? 'attribute float size'
		: `float size = ${opts.size ? opts.size : '10.0'}`
};
			attribute vec3  color;
			varying   vec3  varColor;
			varying   vec2  varTcoord;
			varying   float varSize;
			
			uniform   float winh;
			
			${
	opts.inject && opts.inject.vert && opts.inject.vert.vars
		? opts.inject.vert.vars
		: ''
}
			
			void main() {
				
				${
	opts.inject && opts.inject.vert && opts.inject.vert.before
		? opts.inject.vert.before
		: ''
}
				
				varColor        = color;
				vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );
				gl_Position     = projectionMatrix * mvPosition;
				varSize         = size;
				gl_PointSize    = max(2.0, 2.0 * winh * varSize / length( mvPosition.xyz ));
				varTcoord       = position.xy;
				
				${
	opts.inject && opts.inject.vert && opts.inject.vert.after
		? opts.inject.vert.after
		: ''
}
				
			}
		`;
	}
	
	
	buildFrag(opts) {
		return opts.frag || `
			varying vec3  varColor;
			varying vec2  varTcoord;
			varying float varSize;
			
			${
	opts.inject && opts.inject.frag && opts.inject.frag.vars
		? opts.inject.frag.vars
		: ''
}
			
			void main() {
				
				${
	opts.inject && opts.inject.frag && opts.inject.frag.before
		? opts.inject.frag.before
		: ''
}
				
				float offs = length(gl_PointCoord.xy - vec2(0.5, 0.5));
				float dist = clamp(1.0 - 2.0 * offs, 0.0, 1.0) * 0.2 * varSize;
				dist = pow(dist, 5.0);
				gl_FragColor = vec4(varColor, dist);
				
				${
	opts.inject && opts.inject.frag && opts.inject.frag.after
		? opts.inject.frag.after
		: ''
}
				
			}
		`;
	}
	
	
}


module.exports = Points;