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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
#include <sal/config.h>
#include <epoxy/gl.h>
#include <basegfx/matrix/b2dhommatrix.hxx>
#include <basegfx/polygon/b2dpolygontriangulator.hxx>
#include <basegfx/polygon/b2dpolypolygon.hxx>
#include <basegfx/utils/tools.hxx>
#include <com/sun/star/rendering/ARGBColor.hpp>
#include "ogl_canvastools.hxx"
using namespace ::com::sun::star;
namespace oglcanvas
{
/// triangulates polygon before
void renderComplexPolyPolygon( const ::basegfx::B2DPolyPolygon& rPolyPoly )
{
::basegfx::B2DPolyPolygon aPolyPoly(rPolyPoly);
if( aPolyPoly.areControlPointsUsed() )
aPolyPoly = rPolyPoly.getDefaultAdaptiveSubdivision();
const ::basegfx::B2DRange& rBounds(aPolyPoly.getB2DRange());
const double nWidth=rBounds.getWidth();
const double nHeight=rBounds.getHeight();
const ::basegfx::triangulator::B2DTriangleVector rTriangulatedPolygon(
::basegfx::triangulator::triangulate(aPolyPoly));
for( auto const& rTriangulatedPolygonItem : rTriangulatedPolygon )
{
const::basegfx::triangulator::B2DTriangle& rCandidate(rTriangulatedPolygonItem);
glTexCoord2f(
rCandidate.getA().getX()/nWidth,
rCandidate.getA().getY()/nHeight);
glVertex2d(
rCandidate.getA().getX(),
rCandidate.getA().getY());
glTexCoord2f(
rCandidate.getB().getX()/nWidth,
rCandidate.getB().getY()/nHeight);
glVertex2d(
rCandidate.getB().getX(),
rCandidate.getB().getY());
glTexCoord2f(
rCandidate.getC().getX()/nWidth,
rCandidate.getC().getY()/nHeight);
glVertex2d(
rCandidate.getC().getX(),
rCandidate.getC().getY());
}
}
/** only use this for line polygons.
better not leave triangulation to OpenGL. also, ignores texturing
*/
void renderPolyPolygon( const ::basegfx::B2DPolyPolygon& rPolyPoly )
{
::basegfx::B2DPolyPolygon aPolyPoly(rPolyPoly);
if( aPolyPoly.areControlPointsUsed() )
aPolyPoly = rPolyPoly.getDefaultAdaptiveSubdivision();
for( sal_uInt32 i=0; i<aPolyPoly.count(); i++ )
{
glBegin(GL_LINE_STRIP);
const ::basegfx::B2DPolygon& rPolygon( aPolyPoly.getB2DPolygon(i) );
const sal_uInt32 nPts=rPolygon.count();
const sal_uInt32 nExtPts=nPts + int(rPolygon.isClosed());
for( sal_uInt32 j=0; j<nExtPts; j++ )
{
const ::basegfx::B2DPoint& rPt( rPolygon.getB2DPoint( j % nPts ) );
glVertex2d(rPt.getX(), rPt.getY());
}
glEnd();
}
}
void setupState( const ::basegfx::B2DHomMatrix& rTransform,
GLenum eSrcBlend,
GLenum eDstBlend,
const rendering::ARGBColor& rColor )
{
double aGLTransform[] =
{
rTransform.get(0,0), rTransform.get(1,0), 0, 0,
rTransform.get(0,1), rTransform.get(1,1), 0, 0,
0, 0, 1, 0,
rTransform.get(0,2), rTransform.get(1,2), 0, 1
};
glMultMatrixd(aGLTransform);
glEnable(GL_BLEND);
glBlendFunc(eSrcBlend, eDstBlend);
glColor4d(rColor.Red,
rColor.Green,
rColor.Blue,
rColor.Alpha);
// GL 1.2:
// glBlendEquation( GLenum mode );
// glBlendColor( GLclampf red, GLclampf green,GLclampf blue, GLclampf alpha );
// glConvolutionFilter1D
// glConvolutionFilter2D
// glSeparableFilter2D
}
void renderOSD( const std::vector<double>& rNumbers, double scale )
{
double y=4.0;
basegfx::B2DHomMatrix aTmp;
basegfx::B2DHomMatrix aScaleShear;
aScaleShear.shearX(-0.1);
aScaleShear.scale(scale,scale);
for(double rNumber : rNumbers)
{
aTmp.identity();
aTmp.translate(0,y);
y += 1.2*scale;
basegfx::B2DPolyPolygon aPoly=
basegfx::utils::number2PolyPolygon(rNumber,10,3);
aTmp=aTmp*aScaleShear;
aPoly.transform(aTmp);
glColor4f(0,1,0,1);
renderPolyPolygon(aPoly);
}
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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