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//
// libavg - Media Playback Engine.
// Copyright (C) 2003-2014 Ulrich von Zadow
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
// Current versions can be found at www.libavg.de
//
#include "GPUChromaKeyFilter.h"
#include "Bitmap.h"
#include "ShaderRegistry.h"
#include "OGLShader.h"
#include "ImagingProjection.h"
#include "../base/ObjectCounter.h"
#include "../base/Exception.h"
#include <iostream>
#define SHADERID_CHROMAKEY "chromakey"
#define SHADERID_EROSION "chromakey_erosion"
using namespace std;
namespace avg {
GPUChromaKeyFilter::GPUChromaKeyFilter(const IntPoint& size, bool bStandalone)
: GPUFilter(SHADERID_CHROMAKEY, true, bStandalone, 2),
m_Color(0, 255, 0),
m_HTolerance(0.0),
m_STolerance(0.0),
m_LTolerance(0.0),
m_Softness(0.0),
m_Erosion(0),
m_SpillThreshold(0.0)
{
ObjectCounter::get()->incRef(&typeid(*this));
GLContext::getCurrent()->ensureFullShaders("GPUChromaKeyFilter");
setDimensions(size);
OGLShaderPtr pShader = getShader();
m_pTextureParam = pShader->getParam<int>("u_Texture");
m_pHKeyParam = pShader->getParam<float>("u_HKey");
m_pHToleranceParam = pShader->getParam<float>("u_HTolerance");
m_pHSoftToleranceParam = pShader->getParam<float>("u_HSoftTolerance");
m_pSKeyParam = pShader->getParam<float>("u_SKey");
m_pSToleranceParam = pShader->getParam<float>("u_STolerance");
m_pSSoftToleranceParam = pShader->getParam<float>("u_SSoftTolerance");
m_pLKeyParam = pShader->getParam<float>("u_LKey");
m_pLToleranceParam = pShader->getParam<float>("u_LTolerance");
m_pLSoftToleranceParam = pShader->getParam<float>("u_LSoftTolerance");
m_pSpillThresholdParam = pShader->getParam<float>("u_SpillThreshold");
m_pIsLastParam = pShader->getParam<int>("u_bIsLast");
createShader(SHADERID_EROSION);
pShader = avg::getShader(SHADERID_EROSION);
m_pErosionTextureParam= pShader->getParam<int>("u_Texture");
m_pErosionIsLastParam = pShader->getParam<int>("u_bIsLast");
m_pProjection2 = ImagingProjectionPtr(new ImagingProjection(size));
}
GPUChromaKeyFilter::~GPUChromaKeyFilter()
{
ObjectCounter::get()->decRef(&typeid(*this));
}
void GPUChromaKeyFilter::setParams(const Pixel32& color, float hTolerance,
float sTolerance, float lTolerance, float softness, int erosion,
float spillThreshold)
{
m_Color = color;
m_HTolerance = hTolerance;
m_STolerance = sTolerance;
m_LTolerance = lTolerance;
m_Softness = softness;
m_Erosion = erosion;
m_SpillThreshold = spillThreshold;
if (m_SpillThreshold <= m_HTolerance) {
m_SpillThreshold = m_HTolerance;
}
}
void GPUChromaKeyFilter::applyOnGPU(GLTexturePtr pSrcTex)
{
// Set up double-buffering
int curBufferIndex = m_Erosion%2;
getFBO(curBufferIndex)->activate();
getShader()->activate();
m_pTextureParam->set(0);
float h, s, l;
m_Color.toHSL(h, s, l);
m_pHKeyParam->set(h);
m_pHToleranceParam->set(m_HTolerance*360);
m_pHSoftToleranceParam->set((m_HTolerance+m_Softness)*360.0f);
m_pSKeyParam->set(s);
m_pSToleranceParam->set(m_STolerance);
m_pSSoftToleranceParam->set(m_STolerance+m_Softness);
m_pLKeyParam->set(l);
m_pLToleranceParam->set(m_LTolerance);
m_pLSoftToleranceParam->set(m_LTolerance+m_Softness);
m_pSpillThresholdParam->set(m_SpillThreshold*360);
m_pIsLastParam->set(int(m_Erosion==0));
draw(pSrcTex);
for (int i = 0; i < m_Erosion; ++i) {
curBufferIndex = (curBufferIndex+1)%2;
getFBO(curBufferIndex)->activate();
OGLShaderPtr pShader = avg::getShader(SHADERID_EROSION);
pShader->activate();
m_pErosionTextureParam->set(0);
m_pErosionIsLastParam->set(int(i==m_Erosion-1));
getDestTex((curBufferIndex+1)%2)->activate(GL_TEXTURE0);
m_pProjection2->draw(avg::getShader(SHADERID_EROSION));
}
}
}
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