LandSurround.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 <GLEXT/GLStateExtension.h>
#include <GLEXT/GLInfo.h>
#include <client/ScorchedClient.h>
#include <graph/OptionsDisplay.h>
#include <landscape/Landscape.h>
#include <landscapemap/LandscapeMaps.h>
#include <landscapedef/LandscapeDefinition.h>
#include <landscapedef/LandscapeTex.h>
#include <land/LandSurround.h>
#include <sky/Sky.h>

LandSurround::LandSurround() :
        listNo_(0)
{

}

LandSurround::~LandSurround()
{

}

void LandSurround::draw(HeightMap &map, bool detail, bool lightMap)
{
        if (!listNo_)
        {
                glNewList(listNo_ = glGenLists(1), GL_COMPILE);
                        generateList(map,detail, lightMap);
                glEndList();
        }
        
        glCallList(listNo_);

        GLInfo::addNoTriangles(8);
}

void LandSurround::generate()
{
        if (listNo_) glDeleteLists(listNo_, 1);
        listNo_ = 0;
}

void LandSurround::generateVerts(HeightMap &map)
{
        int width = 1536 + map.getMapWidth();
        int height = 1536 + map.getMapHeight();
        Vector centre(map.getMapWidth() / 2, map.getMapHeight() / 2, 0);
        Vector offset(map.getMapWidth() + width, map.getMapHeight() + height, 0);

        Vector offset2(map.getMapWidth() / 2, map.getMapHeight() / 2, 0);
        hMapBoxVerts_[0] = Vector(centre[0] - offset2[0], centre[1] - offset2[1], 0.0f);
        hMapBoxVerts_[1] = Vector(centre[0] - offset2[0], centre[1] + offset2[1], 0.0f);
        hMapBoxVerts_[2] = Vector(centre[0] + offset2[0], centre[1] + offset2[1], 0.0f);
        hMapBoxVerts_[3] = Vector(centre[0] + offset2[0], centre[1] - offset2[1], 0.0f);

        Vector offset3(width + map.getMapWidth() * 2, height + map.getMapWidth() * 2, 0);
        hMapBoxVerts_[4] = Vector(centre[0] - offset3[0], centre[1] - offset3[1], 0.0f);
        hMapBoxVerts_[5] = Vector(centre[0] - offset3[0], centre[1] + offset3[1], 0.0f);
        hMapBoxVerts_[6] = Vector(centre[0] + offset3[0], centre[1] + offset3[1], 0.0f);
        hMapBoxVerts_[7] = Vector(centre[0] + offset3[0], centre[1] - offset3[1], 0.0f);

        hMapBoxVerts_[8] = Vector(centre[0] - offset2[0], centre[1] - offset3[1], 0.0f);
        hMapBoxVerts_[9] = Vector(centre[0] - offset2[0], centre[1] + offset3[1], 0.0f);
        hMapBoxVerts_[10] = Vector(centre[0] + offset2[0], centre[1] + offset3[1], 0.0f);
        hMapBoxVerts_[11] = Vector(centre[0] + offset2[0], centre[1] - offset3[1], 0.0f);

        hMapBoxVerts_[12] = Vector(centre[0] - offset3[0], centre[1] - offset2[1], 0.0f);
        hMapBoxVerts_[13] = Vector(centre[0] - offset3[0], centre[1] + offset2[1], 0.0f);
        hMapBoxVerts_[14] = Vector(centre[0] + offset3[0], centre[1] + offset2[1], 0.0f);
        hMapBoxVerts_[15] = Vector(centre[0] + offset3[0], centre[1] - offset2[1], 0.0f);
}

void LandSurround::generateList(HeightMap &map, bool detail, bool lightMap)
{
        generateVerts(map);

        const int dataOfs[8][4] = {
                {8,11,3,0},
                {1,2,10,9},
                {4,8,0,12},
                {11,7,15,3},
                {3,15,14,2},
                {2,14,6,10},
                {13,1,9,5},
                {12,0,1,13}
        };

        LandscapeTex &tex =
                *ScorchedClient::instance()->getLandscapeMaps().getDefinitions().getTex();
        Vector &ambient = tex.skyambience;
        Vector &diffuse = tex.skydiffuse;
        Vector &sunPos =
                Landscape::instance()->getSky().getSun().getPosition();
        Vector normal(0.0f, 0.0f, 1.0f);

        float width = float(Landscape::instance()->getGroundTexture().getWidth());
        float height = float(Landscape::instance()->getGroundTexture().getHeight());
        float texTileX = width / 16.0f;
        float texTileY = height / 16.0f;
        
        glBegin(GL_QUADS);
        for (int i=0; i<8; i++) 
        {
                for (int j=0; j<4; j++) 
                {
                        Vector pos = hMapBoxVerts_[dataOfs[i][j]];
                        Vector sunDirection = (sunPos - pos).Normalize();
                        float diffuseLightMult = 
                                (((normal.dotP(sunDirection)) / 2.0f) + 0.5f);                  
                        Vector light = diffuse * diffuseLightMult + ambient;
                        light[0] = MIN(1.0f, light[0]);
                        light[1] = MIN(1.0f, light[1]);
                        light[2] = MIN(1.0f, light[2]);

                        float texX = hMapBoxVerts_[dataOfs[i][j]][0] / width;
                        float texY = hMapBoxVerts_[dataOfs[i][j]][1] / height;

#ifdef SPLAT_MAP
                        glMultiTexCoord2fARB(GL_TEXTURE0_ARB, texX, texY);
#else
                        glMultiTexCoord2fARB(GL_TEXTURE0_ARB, texX * texTileX / 4.0f, texY * texTileY / 4.0f);
#endif
                        if (GLStateExtension::hasMultiTex())
                        {
                                glMultiTexCoord2fARB(GL_TEXTURE1_ARB, texX, texY);
                                if (GLStateExtension::getTextureUnits() > 2)
                                {
                                        glMultiTexCoord2fARB(GL_TEXTURE2_ARB, texX * texTileX, texY * texTileY);
                                }
                        }

                        if (lightMap) glColor3fv(light);
                        else glColor3f(1.0f, 1.0f, 1.0f);
                        glNormal3f(0.0f, 0.0f, 1.0f);
                        glVertex3fv(pos);
                }
        }
        glEnd();
}

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