SkyLine.cpp

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////////////////////////////////////////////////////////////////////////////////
//    Scorched3D (c) 2000-2009
//
//    This file is part of Scorched3D.
//
//    Scorched3D 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.
//
//    Scorched3D 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 Scorched3D; if not, write to the Free Software
//    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
////////////////////////////////////////////////////////////////////////////////

#include <GLEXT/GLState.h>
#include <sky/SkyLine.h>
#include <common/Defines.h>
#include <math.h>

SkyLine::SkyLine() :
        listNo_(0)
{
}

SkyLine::~SkyLine()
{
        clear();
}

void SkyLine::clear()
{
        if (listNo_) glDeleteLists(listNo_, 1);
        listNo_ = 0;
}

void SkyLine::draw(float radius, float radius2, float height)
{
        if (listNo_)
        {
                glCallList(listNo_);
        }
        else
        {
                glNewList(listNo_ = glGenLists(1), GL_COMPILE_AND_EXECUTE);
                        actualDraw(radius, radius2, height);
                glEndList();
        }
}

void SkyLine::actualDraw(float radius, float radius2, float height)
{
        GLState state(GLState::TEXTURE_ON | GLState::BLEND_ON | GLState::ALPHATEST_ON);

        glColor3f(1.0f, 1.0f, 1.0);
        glBegin(GL_QUAD_STRIP);
        for (float a=0.0f; a<=360.0f; a+=360.0f / 12)
        {
                float x = sinf(a / 180.0f * PI) * radius;
                float y = cosf(a / 180.0f * PI) * radius2;

                glTexCoord2f(a / 360.0f, 1.0f);
                glVertex3f(x, y, height);

                glTexCoord2f(a / 360.0f, 0.0f);
                glVertex3f(x, y, 0.0f);
        }
        glEnd();
}

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