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initial commit. This is icculus version 5542b94cae02a6333845854bbbd1abe0a259f1a4

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fgenesis 2011-08-03 22:05:33 +02:00
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BBGE/QuadTrail.cpp Normal file
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/*
Copyright (C) 2007, 2010 - Bit-Blot
This file is part of Aquaria.
Aquaria is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "QuadTrail.h"
#include <assert.h>
QuadTrail::QuadTrail(int maxPoints, float pointDist)
: RenderObject(), maxPoints(maxPoints), pointDist(pointDist), numPoints(0)
{
quadTrailAlphaEffect = QTAE_NORMAL;
cull = false;
repeatTexture = 1;
lifeRate = 0.5;
}
void QuadTrail::addPoint(const Vector &point)
{
if (numPoints > 0)
{
if ((points.back().point - point).isLength2DIn(pointDist))
{
backOffset = point - points.back().point;
return;
}
}
QuadTrailPoint p;
p.point = point;
points.push_back(p);
numPoints++;
if (numPoints >= maxPoints)
points.pop_front();
backOffset.x = 0;
backOffset.y = 0;
}
void QuadTrail::onRender()
{
if (numPoints < 2) return;
#ifdef BBGE_BUILD_OPENGL
glDisable(GL_CULL_FACE);
int c = 0;
Vector p, diff, dl, dr;
Vector lastPoint;
const float texScale = texture ? float(numPoints*pointDist)/texture->width : 1.0f;
glBegin(GL_QUAD_STRIP);
for (Points::iterator i = points.begin(); i != points.end(); i++)
{
if (quadTrailAlphaEffect == QTAE_NORMAL)
{
glColor4f(1, 1, 1, (*i).life);
}
if (c == 0)
{
lastPoint = (*i).point;
c++;
continue;
}
p = (*i).point;
if (c == numPoints-1)
p += backOffset;
diff = p - lastPoint;
//possible opt here
if (texture)
diff.setLength2D(texture->width*0.5f);
else
diff.setLength2D(32);
dl = diff.getPerpendicularLeft();
dr = diff.getPerpendicularRight();
glTexCoord2f(0, (float(c)/numPoints)*texScale);
glVertex2f(p.x+dl.x, p.y+dl.y);
glTexCoord2f(1, (float(c+1)/numPoints)*texScale);
glVertex2f(p.x+dr.x, p.y+dr.y);
c++;
lastPoint = (*i).point;
}
glEnd();
glBindTexture(GL_TEXTURE_2D, 0);
glPointSize(4);
glColor4f(0, 1, 0, 0.5);
glBegin(GL_POINTS);
for (Points::iterator i = points.begin(); i != points.end(); i++)
{
glVertex2f((*i).point.x, (*i).point.y);
}
glEnd();
#endif
}
void QuadTrail::onUpdate(float dt)
{
RenderObject::onUpdate(dt);
for (Points::iterator i = points.begin(); i != points.end(); i++)
{
(*i).life -= dt * lifeRate;
if ((*i).life <= 0)
(*i).life = 0;
}
}