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//////////////////////////////////////////////////////////////////////////////////////////////
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// Copyright 2016 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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precision lowp float;
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uniform sampler2D u_Texture; // The input texture.
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in vec3 v_Position; // Interpolated position for this fragment.
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in vec3 v_Normal; // Interpolated normal for this fragment.
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in vec2 v_TexCoordinate; // Interpolated texture coordinate per fragment.
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out vec4 fragColor; // The output color
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#if NUM_FRAGMENT>0
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uniform int fNumEffects; // total number of fragment effects
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uniform int fType[NUM_FRAGMENT]; // their types.
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uniform vec4 fUniforms[2*NUM_FRAGMENT]; // i-th effect is 2 consecutive vec4's: [2*i], [2*i+1]. First vec4 is the Interpolated values,
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// next describes the Region, i.e. area over which the effect is active.
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#if defined(SATURATION) || defined(SMOOTH_SATURATION)
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const vec3 LUMI = vec3( 0.2125, 0.7154, 0.0721 );
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#endif
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//////////////////////////////////////////////////////////////////////////////////////////////
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// CHROMA EFFECT
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#if defined(CHROMA) || defined(SMOOTH_CHROMA)
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void chroma(float degree, int effect, inout vec4 color)
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{
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color.rgb = mix(color.rgb, fUniforms[effect].yzw, degree*fUniforms[effect].x);
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}
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#endif
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//////////////////////////////////////////////////////////////////////////////////////////////
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// ALPHA EFFECT (change transparency level)
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#if defined(ALPHA) || defined(SMOOTH_ALPHA)
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void alpha(float degree, int effect, inout vec4 color)
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{
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color.a *= (degree*(fUniforms[effect].x-1.0)+1.0);
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}
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#endif
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//////////////////////////////////////////////////////////////////////////////////////////////
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// BRIGHTNESS EFFECT
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#if defined(BRIGHTNESS) || defined(SMOOTH_BRIGHTNESS)
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void brightness(float degree, int effect, inout vec4 color)
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{
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color.rgb = mix(vec3(0.0,0.0,0.0), color.rgb, degree*(fUniforms[effect].x-1.0)+1.0 );
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}
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#endif
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//////////////////////////////////////////////////////////////////////////////////////////////
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// CONTRAST EFFECT
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#if defined(CONTRAST) || defined(SMOOTH_CONTRAST)
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void contrast(float degree, int effect, inout vec4 color)
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{
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color.rgb = mix(vec3(0.5,0.5,0.5), color.rgb, degree*(fUniforms[effect].x-1.0)+1.0 );
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}
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#endif
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//////////////////////////////////////////////////////////////////////////////////////////////
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// SATURATION EFFECT
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#if defined(SATURATION) || defined(SMOOTH_SATURATION)
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void saturation(float degree, int effect, inout vec4 color)
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{
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float luminance = dot(LUMI,color.rgb);
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color.rgb = mix(vec3(luminance,luminance,luminance), color.rgb, degree*(fUniforms[effect].x-1.0)+1.0 );
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}
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#endif
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#endif // NUM_FRAGMENT>0
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//////////////////////////////////////////////////////////////////////////////////////////////
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void main()
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{
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vec4 pixel = texture(u_Texture,v_TexCoordinate);
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#if NUM_FRAGMENT>0
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vec2 diff;
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float pointDegree;
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int j=0;
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for(int i=0; i<fNumEffects; i++)
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{
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diff = (v_Position.xy - fUniforms[j+1].xy)/fUniforms[j+1].zw;
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pointDegree = max(0.0,1.0-dot(diff,diff));
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#ifdef CHROMA
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if( fType[i]==CHROMA ) chroma (sign(pointDegree),j,pixel); else
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#endif
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#ifdef SMOOTH_CHROMA
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if( fType[i]==SMOOTH_CHROMA ) chroma ( pointDegree ,j,pixel); else
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#endif
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#ifdef ALPHA
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if( fType[i]==ALPHA ) alpha (sign(pointDegree),j,pixel); else
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#endif
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#ifdef SMOOTH_ALPHA
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if( fType[i]==SMOOTH_ALPHA ) alpha ( pointDegree ,j,pixel); else
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#endif
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#ifdef BRIGHTNESS
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if( fType[i]==BRIGHTNESS ) brightness(sign(pointDegree),j,pixel); else
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#endif
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#ifdef SMOOTH_BRIGHTNESS
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if( fType[i]==SMOOTH_BRIGHTNESS ) brightness( pointDegree ,j,pixel); else
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#endif
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#ifdef CONTRAST
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if( fType[i]==CONTRAST ) contrast (sign(pointDegree),j,pixel); else
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#endif
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#ifdef SMOOTH_CONTRAST
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if( fType[i]==SMOOTH_CONTRAST ) contrast ( pointDegree ,j,pixel); else
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#endif
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#ifdef SATURATION
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if( fType[i]==SATURATION ) saturation(sign(pointDegree),j,pixel); else
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#endif
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#ifdef SMOOTH_SATURATION
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if( fType[i]==SMOOTH_SATURATION ) saturation( pointDegree ,j,pixel); else
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#endif
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{}
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j+=2;
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}
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#endif
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fragColor = vec4(pixel.rgb * (1.0 + 7.0*v_Normal.z) * 0.125, pixel.a);
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}
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