GraphicalLandscapeMap.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 <landscape/GraphicalLandscapeMap.h>
#include <graph/OptionsDisplay.h>
#include <GLEXT/GLStateExtension.h>
#include <GLEXT/GLVertexBufferObject.h>

GraphicalLandscapeMap::GraphicalLandscapeMap() : 
        heightData_(0), bufferObject_(0), 
        width_(0), height_(0), bufferSizeBytes_(0)
{
}

GraphicalLandscapeMap::~GraphicalLandscapeMap()
{
        delete [] heightData_;
}

void GraphicalLandscapeMap::create(const int width, const int height)
{
        width_ = width; 
        height_ = height;

        delete [] heightData_;
        heightData_ = new HeightData[(width_ + 1) * (height_ + 1)];
        int patchVolume = (width_ + 1) * (height_ + 1);
        bufferSizeBytes_ = patchVolume * sizeof(GraphicalLandscapeMap::HeightData);

        if (GLStateExtension::hasVBO())
        {
                if (!bufferObject_ || bufferObject_->get_map_size() != bufferSizeBytes_) 
                {
                        delete bufferObject_;
                        bufferObject_ = new GLVertexBufferObject();
                        bufferObject_->init_data(bufferSizeBytes_, heightData_, GL_STATIC_DRAW);
                }
        }

        reset();
}

void GraphicalLandscapeMap::reset()
{
        HeightData *current = heightData_;

        int texTileX = width_ / 16;
        int texTileY = height_ / 16;

        for (int y=0; y<=height_; y++)
        {
                for (int x=0; x<=width_; x++)
                {
                        current->floatPosition[0] = float(x);
                        current->floatPosition[1] = float(y);
                        current->floatPosition[2] = 0.0f;

                        current->floatNormal[0] = 0.0f;
                        current->floatNormal[1] = 0.0f;
                        current->floatNormal[2] = 1.0f;

                        current->texCoord1x = float(x) / float(width_);
                        current->texCoord1y = float(y) / float(height_);

                        current->texCoord2x = float(x) / float(width_) * float(texTileX);
                        current->texCoord2y = float(y) / float(height_) * float(texTileY);

                        current++;
                }
        }
}

void GraphicalLandscapeMap::setHeight(int w, int h, float height)
{
        DIALOG_ASSERT(w >= 0 && h >= 0 && w<=width_ && h<=height_);

        HeightData &data = heightData_[(width_+1) * h + w];
        data.floatPosition[2] = height;
}

void GraphicalLandscapeMap::setNormal(int w, int h, Vector &normal)
{
        DIALOG_ASSERT(w >= 0 && h >= 0 && w<=width_ && h<=height_);

        HeightData &data = heightData_[(width_+1) * h + w];
        data.floatNormal = normal;
}

void GraphicalLandscapeMap::updateWholeBuffer()
{
        // Generate the VBO if any
        if (!GLStateExtension::hasVBO()) return;

        bufferObject_->init_data(bufferSizeBytes_, heightData_, GL_STATIC_DRAW);
}

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