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#include "glt_viewport.h"
/*! \file
\ingroup GLT
$Id: viewport.cpp,v 1.13 2002/10/11 08:33:12 nigels Exp $
$Log: viewport.cpp,v $
Revision 1.13 2002/10/11 08:33:12 nigels
Added GLint *() operator
Added resize to (image-space) bounding box
Revision 1.12 2002/10/09 15:09:38 nigels
Added RCS Id and Log tags
*/
#include "glt_texture.h"
#include "glt_error.h"
#include "glt_bbox.h"
#include <cstring>
#include <iostream>
using namespace std;
GltViewport::GltViewport(bool getIt)
{
memset(_viewport,0,sizeof(_viewport));
if (getIt)
get();
}
GltViewport::GltViewport(const GltViewport &viewport)
{
memcpy(_viewport,viewport._viewport,sizeof(_viewport));
}
GltViewport::GltViewport(const GLint x,const GLint y,const GLint width,const GLint height)
{
set(x,y,width,height);
}
GltViewport::~GltViewport()
{
}
GltViewport &
GltViewport::operator=(const GltViewport &viewport)
{
memcpy(_viewport,viewport._viewport,sizeof(_viewport));
return *this;
}
bool
GltViewport::operator==(const GltViewport &viewport) const
{
return memcmp(_viewport,viewport._viewport,sizeof(_viewport))==0;
}
bool
GltViewport::operator!=(const GltViewport &viewport) const
{
return memcmp(_viewport,viewport._viewport,sizeof(_viewport))!=0;
}
bool
GltViewport::valid() const
{
return x()>=0 && y()>=0 && width()>0 && height()>0;
}
void
GltViewport::get()
{
GLERROR(std::cerr);
glGetIntegerv(GL_VIEWPORT,(GLint *) _viewport);
GLERROR(std::cerr);
}
void
GltViewport::set() const
{
GLERROR(std::cerr);
glViewport(x(),y(),width(),height());
GLERROR(std::cerr);
}
void
GltViewport::set(const GLint width,const GLint height)
{
GltViewport::width() = width;
GltViewport::height() = height;
set();
}
void
GltViewport::set(const GLint x,const GLint y,const GLint width,const GLint height)
{
GltViewport::x() = x;
GltViewport::y() = y;
GltViewport::width() = width;
GltViewport::height() = height;
set();
}
//
GLint &GltViewport::x() { return _viewport[0]; }
GLint &GltViewport::y() { return _viewport[1]; }
GLint &GltViewport::width() { return _viewport[2]; }
GLint &GltViewport::height() { return _viewport[3]; }
const GLint &GltViewport::x() const { return _viewport[0]; }
const GLint &GltViewport::y() const { return _viewport[1]; }
const GLint &GltViewport::width() const { return _viewport[2]; }
const GLint &GltViewport::height() const { return _viewport[3]; }
const GLint GltViewport::pixels() const { return _viewport[2]*_viewport[3]; }
GltViewport::operator const GLint *() const { return _viewport; }
GltViewport::operator GLint *() { return _viewport; }
//
bool GltViewport::resize(const GLint width,const GLint height)
{
GltViewport::width() = width;
GltViewport::height() = height;
return valid();
}
bool GltViewport::resize(const GLint x,const GLint y,const GLint width,const GLint height)
{
GltViewport::x() = x;
GltViewport::y() = y;
GltViewport::width() = width;
GltViewport::height() = height;
return valid();
}
bool GltViewport::resize(const GltTexture &texture)
{
GltViewport::width() = texture.width();
GltViewport::height() = texture.height();
return valid();
}
bool GltViewport::resize(const BoundingBox &box)
{
GltViewport::x() = (GLint) floor(box.min().x());
GltViewport::y() = (GLint) floor(box.min().y());
GltViewport::width() = (GLint) ceil(box.width());
GltViewport::height() = (GLint) ceil(box.height());
return valid();
}
bool GltViewport::align(const GltHorizontalAlignment &align,const GltViewport &window)
{
switch (align)
{
case GLT_ALIGN_LEFT: x() = window.x(); break;
case GLT_ALIGN_HCENTER: x() = window.x() + ((window.width()-width())>>1); break;
case GLT_ALIGN_RIGHT: x() = window.x() + window.width()-width(); break;
}
return valid();
}
bool GltViewport::align(const GltVerticalAlignment &align,const GltViewport &window)
{
switch (align)
{
case GLT_ALIGN_TOP: y() = window.y() + window.height()-height(); break;
case GLT_ALIGN_VCENTER: y() = window.y() + ((window.height()-height())>>1); break;
case GLT_ALIGN_BOTTOM: y() = window.y(); break;
}
return valid();
}
bool GltViewport::shrink(const GLint w)
{
x() += w;
y() += w;
width() -= w<<1;
height() -= w<<1;
return true;
}
//
void GltViewport::drawQuad() const
{
const GLint x = width();
const GLint y = height();
glBegin(GL_QUADS);
glVertex2i(0,0);
glVertex2i(x,0);
glVertex2i(x,y);
glVertex2i(0,y);
glEnd();
}
void GltViewport::drawLines() const
{
const GLint x = width()-1;
const GLint y = height()-1;
glBegin(GL_LINE_LOOP);
glVertex2i(0,0);
glVertex2i(x,0);
glVertex2i(x,y);
glVertex2i(0,y);
glEnd();
}
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