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///////////////////////////////////////////////////////////////////////////////////////////////////
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// Copyright 2017 Leszek Koltunski //
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// //
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// This file is part of Distorted. //
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// //
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// Distorted is free software: you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation, either version 2 of the License, or //
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// (at your option) any later version. //
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// //
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// Distorted is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with Distorted. If not, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////////////////////
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package org.distorted.library.effect;
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import org.distorted.library.type.Data2D;
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import org.distorted.library.type.Data3D;
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import org.distorted.library.type.Data4D;
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///////////////////////////////////////////////////////////////////////////////////////////////////
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/**
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* Pull all points around the center of the Effect towards a line passing through the center
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* (that's if degree>=1) or push them away from the line (degree<=1).
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*
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* Note: this is not a fully 3D effect - the pinching is always within the XY plane; z coordinates
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* of all vertices remain unaffected. If someone wants a fully 3D Pinch effect, we'd probably need
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* to write another VertexEffectPinch3D with 2 more arguments (latitude and longitude angles defining
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* the plane the pinching works on).
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*/
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public class VertexEffectPinch extends VertexEffect
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{
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private Data2D mPinch;
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private Data3D mCenter;
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private Data4D mRegion;
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///////////////////////////////////////////////////////////////////////////////////////////////////
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/**
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* Only for use by the library itself.
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*
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* @y.exclude
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*/
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public boolean compute(float[] uniforms, int index, long currentDuration, long step )
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{
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mCenter.get(uniforms,index+CENTER_OFFSET,currentDuration,step);
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mRegion.get(uniforms,index+REGION_OFFSET,currentDuration,step);
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boolean ret = mPinch.get(uniforms,index,currentDuration,step);
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uniforms[index+1] = (float)(Math.PI*uniforms[index+1]/180);
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return ret;
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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// PUBLIC API
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///////////////////////////////////////////////////////////////////////////////////////////////////
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// Pull P=(v.x,v.y) towards the line that
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// a) passes through the center of the effect
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// b) forms angle defined in the 2nd interpolated value with the X-axis
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// with P' = P + (1-h)*dist(line to P)
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// when h>1 we are pushing points away from S: P' = P + (1/h-1)*dist(line to P)
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///////////////////////////////////////////////////////////////////////////////////////////////////
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/**
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* Have to call this before the shaders get compiled (i.e before Distorted.onCreate()) for the Effect to work.
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*/
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public static void enable()
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{
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addEffect(EffectName.PINCH,
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"vec3 center = vUniforms[effect+1].yzw; \n"
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+ "vec3 ps = center-v; \n"
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+ "float h = vUniforms[effect].x; \n"
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+ "float t = degree(vUniforms[effect+2],center,ps) * (1.0-h)/max(1.0,h); \n"
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+ "float angle = vUniforms[effect].y; \n"
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+ "vec2 dir = vec2(sin(angle),-cos(angle)); \n"
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+ "v.xy += t*dot(ps.xy,dir)*dir;"
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);
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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/**
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* Pull all points around the center of the Effect towards a line passing through the center
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* (that's if degree>=1) or push them away from the line (degree<=1)
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*
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* @param pinch The current degree of the Effect + angle the line forms with X-axis
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* @param center 3-dimensional Data that, at any given time, returns the Center of the Effect.
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* @param region Region that masks the Effect.
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*/
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public VertexEffectPinch(Data2D pinch, Data3D center, Data4D region)
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{
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super(EffectName.PINCH);
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mPinch = pinch;
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mCenter = center;
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mRegion = (region==null ? MAX_REGION : region);
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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/**
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* Pull all points around the center of the Effect towards a line passing through the center
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* (that's if degree>=1) or push them away from the line (degree<=1)
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*
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* @param pinch The current degree of the Effect + angle the line forms with X-axis
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* @param center 3-dimensional Data that, at any given time, returns the Center of the Effect.
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*/
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public VertexEffectPinch(Data2D pinch, Data3D center)
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{
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super(EffectName.PINCH);
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mPinch = pinch;
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mCenter = center;
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mRegion = MAX_REGION;
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}
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}
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