PostProcessorGrayPlugin.cc 5.46 KB
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/*===========================================================================*\
*                                                                            *
*                              OpenFlipper                                   *
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 *           Copyright (c) 2001-2015, RWTH-Aachen University                 *
 *           Department of Computer Graphics and Multimedia                  *
 *                          All rights reserved.                             *
 *                            www.openflipper.org                            *
 *                                                                           *
 *---------------------------------------------------------------------------*
 * This file is part of OpenFlipper.                                         *
 *---------------------------------------------------------------------------*
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 * Redistribution and use in source and binary forms, with or without        *
 * modification, are permitted provided that the following conditions        *
 * are met:                                                                  *
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 * 1. Redistributions of source code must retain the above copyright notice, *
 *    this list of conditions and the following disclaimer.                  *
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 * 2. Redistributions in binary form must reproduce the above copyright      *
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 *    this software without specific prior written permission.               *
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS       *
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*                                                                            *
\*===========================================================================*/

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#include <ACG/GL/acg_glew.hh>
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#include "PostProcessorGrayPlugin.hh"

#include <ACG/GL/ScreenQuad.hh>

#include <OpenFlipper/BasePlugin/PluginFunctions.hh>

PostProcessorGrayscalePlugin::PostProcessorGrayscalePlugin() :
shader_(0)
{
}

PostProcessorGrayscalePlugin::~PostProcessorGrayscalePlugin()
{
  delete shader_;
}


QString PostProcessorGrayscalePlugin::postProcessorName() {
  return QString("Grayscale");
}

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QString PostProcessorGrayscalePlugin::checkOpenGL() {
  if (!ACG::openGLVersion(3, 0))
    return QString("Insufficient OpenGL Version! OpenGL 3.0 or higher required");

  return QString("");
}

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void PostProcessorGrayscalePlugin::postProcess(ACG::GLState* _glstate, const std::vector<const PostProcessorInput*>& _input, const PostProcessorOutput& _output) {
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  // ======================================================================================================
  // Load shader if needed
  // ======================================================================================================
  if (!shader_)
    shader_ = GLSL::loadProgram("Grayscale/screenquad.glsl", "Grayscale/gray.glsl");

  // ======================================================================================================
  // Bind input texture
  // ======================================================================================================

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//  glEnable(GL_TEXTURE_2D);
  _input[0]->bindColorTex(0);
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  // ======================================================================================================
  // Bind output FBO
  // ======================================================================================================

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  _output.bind();
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  // ======================================================================================================
  // Setup shader
  // ======================================================================================================

  shader_->use();
  shader_->setUniform("textureSampler", 0);

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  ACG::Vec2f texcoordOffset(1.0f / float(_input[0]->width), 1.0f / float(_input[0]->height));
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  shader_->setUniform("texcoordOffset", texcoordOffset);

  // ======================================================================================================
  // Execute
  // ======================================================================================================

  ACG::ScreenQuad::draw(shader_);


  shader_->disable();
}