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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 "GPUShadowFilter.h"
#include "Bitmap.h"
#include "ShaderRegistry.h"
#include "OGLShader.h"
#include "ImagingProjection.h"
#include "../base/ObjectCounter.h"
#include "../base/MathHelper.h"
#include "../base/Exception.h"
#include <string.h>
#include <iostream>
#define SHADERID_HORIZ "horizshadow"
#define SHADERID_VERT "vertshadow"
using namespace std;
namespace avg {
GPUShadowFilter::GPUShadowFilter(const IntPoint& size, const glm::vec2& offset,
float stdDev, float opacity, const Pixel32& color)
: GPUFilter(SHADERID_HORIZ, true, false, 2)
{
ObjectCounter::get()->incRef(&typeid(*this));
GLContext::getCurrent()->ensureFullShaders("GPUShadowFilter");
setDimensions(size, stdDev, offset);
createShader(SHADERID_VERT);
setParams(offset, stdDev, opacity, color);
OGLShaderPtr pShader = getShader();
m_pHorizWidthParam = pShader->getParam<float>("u_Width");
m_pHorizRadiusParam = pShader->getParam<int>("u_Radius");
m_pHorizTextureParam = pShader->getParam<int>("u_Texture");
m_pHorizKernelTexParam = pShader->getParam<int>("u_KernelTex");
m_pHorizOffsetParam = pShader->getParam<glm::vec2>("u_Offset");
pShader = avg::getShader(SHADERID_VERT);
m_pVertWidthParam = pShader->getParam<float>("u_Width");
m_pVertRadiusParam = pShader->getParam<int>("u_Radius");
m_pVertTextureParam = pShader->getParam<int>("u_HBlurTex");
m_pVertKernelTexParam = pShader->getParam<int>("u_KernelTex");
m_pVertColorParam = pShader->getParam<Pixel32>("u_Color");
m_pVertOrigTexParam = pShader->getParam<int>("u_OrigTex");
m_pVertDestPosParam = pShader->getParam<glm::vec2>("u_DestPos");
m_pVertDestSizeParam = pShader->getParam<glm::vec2>("u_DestSize");
}
GPUShadowFilter::~GPUShadowFilter()
{
ObjectCounter::get()->decRef(&typeid(*this));
}
void GPUShadowFilter::setParams(const glm::vec2& offset, float stdDev, float opacity,
const Pixel32& color)
{
m_Offset = offset;
m_StdDev = stdDev;
m_Opacity = opacity;
m_Color = color;
m_pGaussCurveTex = calcBlurKernelTex(m_StdDev, m_Opacity, false);
setDimensions(getSrcSize(), stdDev, offset);
IntRect destRect2(IntPoint(0,0), getDestRect().size());
m_pProjection2 = ImagingProjectionPtr(new ImagingProjection(
getDestRect().size(), destRect2));
}
void GPUShadowFilter::applyOnGPU(GLTexturePtr pSrcTex)
{
int kernelWidth = m_pGaussCurveTex->getSize().x;
getFBO(1)->activate();
getShader()->activate();
m_pHorizWidthParam->set(float(kernelWidth));
m_pHorizRadiusParam->set((kernelWidth-1)/2);
m_pHorizTextureParam->set(0);
m_pHorizKernelTexParam->set(1);
IntPoint size = getSrcSize();
glm::vec2 texOffset(m_Offset.x/size.x, m_Offset.y/size.y);
m_pHorizOffsetParam->set(texOffset);
m_pGaussCurveTex->activate(GL_TEXTURE1);
draw(pSrcTex);
getFBO(0)->activate();
OGLShaderPtr pVShader = avg::getShader(SHADERID_VERT);
pVShader->activate();
m_pVertWidthParam->set(float(kernelWidth));
m_pVertRadiusParam->set((kernelWidth-1)/2);
m_pVertTextureParam->set(0);
m_pVertKernelTexParam->set(1);
m_pVertColorParam->set(m_Color);
pSrcTex->activate(GL_TEXTURE2);
m_pVertOrigTexParam->set(2);
FRect destRect = getRelDestRect();
m_pVertDestPosParam->set(destRect.tl);
m_pVertDestSizeParam->set(destRect.size());
getDestTex(1)->activate(GL_TEXTURE0);
m_pProjection2->draw(avg::getShader(SHADERID_VERT));
}
void GPUShadowFilter::setDimensions(IntPoint size, float stdDev, const glm::vec2& offset)
{
int radius = getBlurKernelRadius(stdDev);
IntPoint radiusOffset(radius, radius);
IntPoint intOffset(offset);
IntRect destRect(intOffset-radiusOffset, intOffset+size+radiusOffset+IntPoint(1,1));
destRect.expand(IntRect(IntPoint(0,0), size));
//TODO FIX OPENGLESV2
#ifndef AVG_ENABLE_EGL
GPUFilter::setDimensions(size, destRect, GL_CLAMP_TO_BORDER);
#endif
}
}
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