PostProcessor.cpp

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#include "PostProcessor.h"
#include "Texture.h"
#include "ngl/ShaderManager.h"
#include "sstream"

PostProcessor::PostProcessor(int _w, int _h, GLuint _vao):
                             m_screenQuad(0.0f, 0.0f, 0.5f, 1.0f),
                             m_width(_w),
                             m_height(_h),
                             m_fbo(_w,_h),
                             m_vao(_vao),
                             m_currentAttachment(0)
{
    Texture tmp("tmp");
    tmp.generateEmpty(_w, _h);
    m_fbo.create(tmp.id);
}

void PostProcessor::addEffect(const std::string &_effectName, Effect _e)
{
    m_effects.insert(std::pair<std::string, Effect>(_effectName, _e));
}

void PostProcessor::start()
{
    m_fbo.bind();

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
}

void PostProcessor::doEffect(const std::string &_effectName)
{
    m_fbo.bindTextureSlot(m_currentAttachment, m_effects[_effectName].getOutputId());
    m_fbo.activateTarget(m_currentAttachment);

    m_currentAttachment++;
    if(m_currentAttachment > 3)
        m_currentAttachment = 0;

    m_effects[_effectName].prepare();

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    m_screenQuad.draw(m_effects[_effectName].getShaderName(), m_vao);

    m_finalComposite = m_effects[_effectName].getOutputId();
}