framework2

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/*
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 *  ContrastPass.h
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 *
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 *  Copyright (c) 2013, satcy, http://satcy.net
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 *  All rights reserved. 
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 *  
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 *  Redistribution and use in source and binary forms, with or without 
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 *  modification, are permitted provided that the following conditions are met: 
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 *  
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 *  * Redistributions of source code must retain the above copyright notice, 
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 *    this list of conditions and the following disclaimer. 
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 *  * Redistributions in binary form must reproduce the above copyright 
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 *    notice, this list of conditions and the following disclaimer in the 
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 *    documentation and/or other materials provided with the distribution. 
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 *  * Neither the name of Neil Mendoza nor the names of its contributors may be used 
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 *    to endorse or promote products derived from this software without 
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 *    specific prior written permission. 
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 *  
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 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
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 *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
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 *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
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 *  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 
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 *  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
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 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
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 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
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 *  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
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 *  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
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 *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
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 *  POSSIBILITY OF SUCH DAMAGE. 
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 *
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 */
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#include "ContrastPass.h"
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#include "ofMain.h"
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namespace itg
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{
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    ContrastPass::ContrastPass(const ofVec2f& aspect, bool arb, float contrast, float brightness) :
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        contrast(contrast), brightness(brightness), RenderPass(aspect, arb, "contrast")
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    {
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        multiple = 1.0f;
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        string fragShaderSrc = STRINGIFY(uniform sampler2D tex0;
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                                         uniform float contrast;
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                                         uniform float brightness;
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                                         uniform float multiple;
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                                         void main(){
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                                             vec4 color = texture2D(tex0,gl_TexCoord[0].st);
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                                             float p = 0.3 *color.g + 0.59*color.r + 0.11*color.b;
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                                             p = p * brightness;
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                                             vec4 color2 = vec4(p,p,p,1.0);
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                                             color *= color2;
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                                             color *= vec4(multiple,multiple,multiple,1.0);
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                                             color = mix( vec4(1.0,1.0,1.0,1.0),color,contrast);
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                                             gl_FragColor =  vec4(color.r , color.g, color.b, 1.0);
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                                         }
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                                         );
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        shader.setupShaderFromSource(GL_FRAGMENT_SHADER, fragShaderSrc);
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        shader.linkProgram();
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    }
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    void ContrastPass::render(ofFbo& readFbo, ofFbo& writeFbo)
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    {
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        writeFbo.begin();
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        ofClear(0, 0, 0, 255);
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        shader.begin();
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        shader.setUniformTexture("tex0", readFbo, 0);
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        shader.setUniform1f("contrast", contrast);
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        shader.setUniform1f("brightness", brightness);
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        shader.setUniform1f("multiple", multiple);
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        texturedQuad(0, 0, writeFbo.getWidth(), writeFbo.getHeight());
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        shader.end();
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        writeFbo.end();
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    }
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}