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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 "ImagingProjection.h"
#include "GLContext.h"
#include "OGLShader.h"
#include "../base/Exception.h"
namespace avg {
ImagingProjection::ImagingProjection(IntPoint size)
: m_Color(0, 0, 0, 0),
m_pVA(new VertexArray)
{
init(size, IntRect(IntPoint(0,0), size));
}
ImagingProjection::ImagingProjection(IntPoint srcSize, IntRect destRect)
: m_Color(0, 0, 0, 0),
m_pVA(new VertexArray)
{
init(srcSize, destRect);
}
ImagingProjection::~ImagingProjection()
{
}
void ImagingProjection::setColor(const Pixel32& color)
{
if (color != m_Color) {
m_Color = color;
init(m_SrcSize, m_DestRect);
}
}
void ImagingProjection::draw(const OGLShaderPtr& pShader)
{
IntPoint destSize = m_DestRect.size();
glViewport(0, 0, destSize.x, destSize.y);
pShader->setTransform(m_ProjMat);
m_pVA->draw();
}
void ImagingProjection::init(IntPoint srcSize, IntRect destRect)
{
m_SrcSize = srcSize;
m_DestRect = destRect;
FRect dest = destRect;
glm::vec2 p1(dest.tl.x/srcSize.x, dest.tl.y/srcSize.y);
glm::vec2 p3(dest.br.x/srcSize.x, dest.br.y/srcSize.y);
glm::vec2 p2(p1.x, p3.y);
glm::vec2 p4(p3.x, p1.y);
m_pVA->reset();
m_pVA->appendPos(p1, p1, m_Color);
m_pVA->appendPos(p2, p2, m_Color);
m_pVA->appendPos(p3, p3, m_Color);
m_pVA->appendPos(p4, p4, m_Color);
m_pVA->appendQuadIndexes(1,0,2,3);
IntPoint destSize = m_DestRect.size();
glm::mat4 projMat(glm::ortho(0.f, float(destSize.x), 0.f, float(destSize.y)));
glm::vec3 offset(-m_DestRect.tl.x, -m_DestRect.tl.y, 0);
glm::mat4 transform = glm::translate(projMat, offset);
glm::vec3 size(m_SrcSize.x, m_SrcSize.y, 1);
m_ProjMat = glm::scale(transform, size);
}
}
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