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/*
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 *  LimbDarkeningPass.cpp
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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 "LimbDarkeningPass.h"
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namespace itg
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{
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    LimbDarkeningPass::LimbDarkeningPass(const ofVec2f& aspect,
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                                         bool arb,
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                                         float radialScale,
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                                         float brightness,
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                                         const ofVec3f & startColor,
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                                         const ofVec3f & endColor) :
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    radialScale(radialScale), brightness(brightness), startColor(startColor), endColor(endColor), RenderPass(aspect, arb, "limbdarkening")
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    {
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        string fragShaderSrc = STRINGIFY(
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            uniform sampler2D myTexture;
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            uniform float fAspect;
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            uniform vec3 startColor;
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            uniform vec3 endColor;
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            uniform float radialScale;//0. - 1.0 - 2.0
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            uniform float brightness;//0.-1.0, deff:2.5
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            void main() {
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                vec2 vUv = gl_TexCoord[0].st;
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                vec2 vSunPositionScreenSpace = vec2(0.5);
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                vec2 diff = vUv - vSunPositionScreenSpace;
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                // Correct for aspect ratio
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                diff.x *= fAspect;
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                float prop = length( diff ) / radialScale;
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                prop = clamp( 2.5 * pow( 1.0 - prop, 3.0 ), 0.0, 1.0 );
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                vec3 color = mix( startColor, endColor, 1.0 - prop );
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                vec4 base = texture2D(myTexture, vUv);
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                gl_FragColor = vec4(base.xyz * color, 1.0);
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            }
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        );
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        shader.setupShaderFromSource(GL_FRAGMENT_SHADER, "#version 110\n" + fragShaderSrc);
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        shader.linkProgram();
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    }
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    void LimbDarkeningPass::render(ofFbo& readFbo, ofFbo& writeFbo)
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    {
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        writeFbo.begin();
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        shader.begin();
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        shader.setUniformTexture("myTexture", readFbo.getTexture(), 0);
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        shader.setUniform1f("fAspect", 1);
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        shader.setUniform3f("startColor", 1, 1, 1);
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        shader.setUniform3f("endColor", 0, 0, 0);
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        shader.setUniform1f("radialScale", 1.2);
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        shader.setUniform1f("brightness", 2.5);
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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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}
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