NormalRenderer.cc

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#include "NormalRenderer.hh"

#include <OpenFlipper/common/GlobalOptions.hh>
#include <OpenFlipper/BasePlugin/PluginFunctions.hh>
#include <ACG/GL/ShaderCache.hh>



// =================================================

class NormalFragmentModifier : public ACG::ShaderModifier
{
public:

  void modifyVertexIO( ACG::ShaderGenerator* _shader )
  {
    // request object space normals
    _shader->addDefine("SG_REQUEST_NORMALOS");
  }

  void modifyFragmentEndCode(QStringList* _code)
  {
    _code->push_back("#ifdef SG_INPUT_NORMALOS");
    _code->push_back("outFragment = vec4(normalize(SG_INPUT_NORMALOS) * 0.5 + vec3(0.5, 0.5, 0.5),1.0);");
    _code->push_back("#endif ");
  }

  static NormalFragmentModifier instance;
};


NormalFragmentModifier NormalFragmentModifier::instance;

// =================================================

NormalRenderer::NormalRenderer()
{
  ACG::ShaderProgGenerator::registerModifier(&NormalFragmentModifier::instance);
}


NormalRenderer::~NormalRenderer()
{
}


void NormalRenderer::initializePlugin()
{
  ACG::ShaderProgGenerator::setShaderDir(OpenFlipper::Options::shaderDirStr());
}

QString NormalRenderer::renderObjectsInfo(bool _outputShaderInfo) {
  std::vector<ACG::ShaderModifier*> modifiers;
  modifiers.push_back(&NormalFragmentModifier::instance);
  return dumpCurrentRenderObjectsToString(&sortedObjects_[0], _outputShaderInfo, &modifiers);
}

void NormalRenderer::render(ACG::GLState* _glState, Viewer::ViewerProperties& _properties)
{
  // collect renderobjects + prepare OpenGL state
  prepareRenderingPipeline(_glState, _properties.drawMode(), PluginFunctions::getSceneGraphRootNode());

  // render every object
  for (int i = 0; i < getNumRenderObjects(); ++i) {

    // Take original shader and modify the output to take only the normal as the color
    GLSL::Program* prog = ACG::ShaderCache::getInstance()->getProgram(&sortedObjects_[i]->shaderDesc, NormalFragmentModifier::instance);
    renderObject(sortedObjects_[i],prog);
  }

  // restore common opengl state
  // log window remains hidden otherwise
  finishRenderingPipeline();
}

QString NormalRenderer::checkOpenGL()
{
  if (!ACG::openGLVersion(3,2))
    return QString("Insufficient OpenGL Version! OpenGL 3.2 or higher required");

  QString missing("");
  if(!ACG::openGLVersion(1,5)) // extension is part of opengl spec since version 1.5
  {                            // i recommend removing this check in favor of restricting
                               // to a more modern version of opengl e.g. 2.1 should be minimum
    if ( !ACG::checkExtensionSupported("GL_ARB_vertex_buffer_object") )
        missing += "GL_ARB_vertex_buffer_object extension missing\n";
  }

#ifndef __APPLE__
  if ( !ACG::checkExtensionSupported("GL_ARB_vertex_program") )
    missing += "GL_ARB_vertex_program extension missing\n";
#endif

  return missing;
}