WaterManager.cpp

Go to the documentation of this file.

/* Copyright (C) 2013 Wildfire Games.
 * This file is part of 0 A.D.
 *
 * 0 A.D. 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.
 *
 * 0 A.D. 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 0 A.D.  If not, see <http://www.gnu.org/licenses/>.
 */

/*
 * Water settings (speed, height) and texture management
 */

#include "precompiled.h"

#include "graphics/Terrain.h"
#include "graphics/TextureManager.h"

#include "lib/bits.h"
#include "lib/timer.h"
#include "lib/tex/tex.h"
#include "lib/res/graphics/ogl_tex.h"

#include "maths/MathUtil.h"
#include "maths/Vector2D.h"

#include "ps/Game.h"
#include "ps/World.h"

#include "renderer/WaterManager.h"
#include "renderer/Renderer.h"

#include "simulation2/Simulation2.h"
#include "simulation2/components/ICmpWaterManager.h"
#include "simulation2/components/ICmpRangeManager.h"


///////////////////////////////////////////////////////////////////////////////////////////////
// WaterManager implementation


///////////////////////////////////////////////////////////////////
// Construction/Destruction
WaterManager::WaterManager()
{
    // water
    m_RenderWater = false; // disabled until textures are successfully loaded
    m_WaterHeight = 5.0f;
    m_WaterColor = CColor(0.3f, 0.35f, 0.7f, 1.0f);
    m_WaterFullDepth = 5.0f;
    m_WaterMaxAlpha = 1.0f;
    m_WaterAlphaOffset = -0.05f;
    m_SWaterTrans = 0;
    m_TWaterTrans = 0;
    m_SWaterSpeed = 0.0015f;
    m_TWaterSpeed = 0.0015f;
    m_SWaterScrollCounter = 0;
    m_TWaterScrollCounter = 0;
    m_WaterCurrentTex = 0;
    m_ReflectionTexture = 0;
    m_RefractionTexture = 0;
    m_ReflectionTextureSize = 0;
    m_RefractionTextureSize = 0;
    m_WaterTexTimer = 0.0;
    m_Shininess = 150.0f;
    m_SpecularStrength = 0.6f;
    m_Waviness = 8.0f;
    m_ReflectionTint = CColor(0.28f, 0.3f, 0.59f, 1.0f);
    m_ReflectionTintStrength = 0.0f;
    m_WaterTint = CColor(0.28f, 0.3f, 0.59f, 1.0f);
    m_Murkiness = 0.45f;
    m_RepeatPeriod = 16.0f;
    m_WaveX = NULL;
    m_WaveZ = NULL;
    m_DistanceToShore = NULL;
    m_FoamFactor = NULL;

    m_WaterNormal = false;
    m_WaterRealDepth = false;
    m_WaterFoam = false;
    m_WaterCoastalWaves = false;
    m_WaterRefraction = false;
    m_WaterReflection = false;
    m_WaterShadows = false;
    
    m_NeedsReloading = false;
    m_NeedInfoUpdate = true;
    
    m_VBWaves = NULL;
    m_VBWavesIndices = NULL;

    m_depthTT = 0;
    m_waveTT = 0;

    m_MapSize = 0;
    
    m_updatei0 = 0;
    m_updatej0 = 0;
    m_updatei1 = 0;
    m_updatej1 = 0;
}

WaterManager::~WaterManager()
{
    // Cleanup if the caller messed up
    UnloadWaterTextures();
    delete[] m_WaveX;
    delete[] m_WaveZ;
    delete[] m_DistanceToShore;
    delete[] m_FoamFactor;
    
    glDeleteTextures(1, &m_depthTT);
    glDeleteTextures(1, &m_waveTT);
    
    if (m_VBWaves) g_VBMan.Release(m_VBWaves);
    if (m_VBWavesIndices) g_VBMan.Release(m_VBWavesIndices);

}


///////////////////////////////////////////////////////////////////
// Progressive load of water textures
int WaterManager::LoadWaterTextures()
{
    // TODO: this doesn't need to be progressive-loading any more
    // (since texture loading is async now)

    // TODO: add a member variable and setter for this. (can't make this
    // a parameter because this function is called via delay-load code)
    static const wchar_t* const water_type = L"default";

    wchar_t pathname[PATH_MAX];

    // Load diffuse grayscale images (for non-fancy water)
    for (size_t i = 0; i < ARRAY_SIZE(m_WaterTexture); ++i)
    {
        swprintf_s(pathname, ARRAY_SIZE(pathname), L"art/textures/animated/water/%ls/diffuse%02d.dds", water_type, (int)i+1);
        CTextureProperties textureProps(pathname);
        textureProps.SetWrap(GL_REPEAT);

        CTexturePtr texture = g_Renderer.GetTextureManager().CreateTexture(textureProps);
        texture->Prefetch();
        m_WaterTexture[i] = texture;
    }

    // Load normalmaps (for fancy water)
    for (size_t i = 0; i < ARRAY_SIZE(m_NormalMap); ++i)
    {
        swprintf_s(pathname, ARRAY_SIZE(pathname), L"art/textures/animated/water/%ls/normal%02d.dds", water_type, (int)i+1);
        CTextureProperties textureProps(pathname);
        textureProps.SetWrap(GL_REPEAT);
        textureProps.SetMaxAnisotropy(4);
        
        CTexturePtr texture = g_Renderer.GetTextureManager().CreateTexture(textureProps);
        texture->Prefetch();
        m_NormalMap[i] = texture;
    }
    // Load foam (for fancy water)
    {
        CTextureProperties textureProps("art/textures/terrain/types/water/foam.png");
        textureProps.SetWrap(GL_REPEAT);
        
        CTexturePtr texture = g_Renderer.GetTextureManager().CreateTexture(textureProps);
        texture->Prefetch();
        m_Foam = texture;
    }
    // Load waves (for fancy water)
    {
        CTextureProperties textureProps("art/textures/terrain/types/water/shore_wave.png");
        textureProps.SetWrap(GL_REPEAT);
        
        CTexturePtr texture = g_Renderer.GetTextureManager().CreateTexture(textureProps);
        texture->Prefetch();
        m_Wave = texture;
    }
    // Set the size to the largest power of 2 that is <= to the window height, so
    // the reflection/refraction images will fit within the window
    // (alternative: use FBO's, which can have arbitrary size - but do we need
    // the reflection/refraction textures to be that large?)
    int size = (int)round_up_to_pow2((unsigned)g_Renderer.GetHeight());
    if(size > g_Renderer.GetHeight()) size /= 2;
    m_ReflectionTextureSize = size;
    m_RefractionTextureSize = size;

    // Create reflection texture
    glGenTextures(1, &m_ReflectionTexture);
    glBindTexture(GL_TEXTURE_2D, m_ReflectionTexture);
    glTexImage2D( GL_TEXTURE_2D, 0, GL_RGB,
        (GLsizei)m_ReflectionTextureSize, (GLsizei)m_ReflectionTextureSize,
        0,  GL_RGB, GL_UNSIGNED_BYTE, 0);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_MIRRORED_REPEAT);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_MIRRORED_REPEAT);
    
    // Create refraction texture
    glGenTextures(1, &m_RefractionTexture);
    glBindTexture(GL_TEXTURE_2D, m_RefractionTexture);
    glTexImage2D( GL_TEXTURE_2D, 0, GL_RGB, 
        (GLsizei)m_RefractionTextureSize, (GLsizei)m_RefractionTextureSize,
        0,  GL_RGB, GL_UNSIGNED_BYTE, 0);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_MIRRORED_REPEAT);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_MIRRORED_REPEAT);

    // Enable rendering, now that we've succeeded this far
    m_RenderWater = true;

    return 0;
}


///////////////////////////////////////////////////////////////////
// Unload water textures
void WaterManager::UnloadWaterTextures()
{
    for(size_t i = 0; i < ARRAY_SIZE(m_WaterTexture); i++)
    {
        m_WaterTexture[i].reset();
    }


    for(size_t i = 0; i < ARRAY_SIZE(m_NormalMap); i++)
    {
        m_NormalMap[i].reset();
    }
}

///////////////////////////////////////////////////////////////////
// Create information about the terrain and wave vertices.
void WaterManager::CreateSuperfancyInfo(CSimulation2* simulation)
{
    if (m_VBWaves)
    {
        g_VBMan.Release(m_VBWaves);
        m_VBWaves = NULL;
    }
    if (m_VBWavesIndices)
    {
        g_VBMan.Release(m_VBWavesIndices);
        m_VBWavesIndices = NULL;
    }

    CTerrain* terrain = g_Game->GetWorld()->GetTerrain();
    
    CmpPtr<ICmpWaterManager> cmpWaterManager(*simulation, SYSTEM_ENTITY);
    if (!cmpWaterManager)
        return; // REALLY shouldn't happen and will most likely crash.

    // Using this to get some more optimization on circular maps
    CmpPtr<ICmpRangeManager> cmpRangeManager(*simulation, SYSTEM_ENTITY);
    if (!cmpRangeManager)
        return;
    bool circular = cmpRangeManager->GetLosCircular();
    float mSize = m_MapSize*m_MapSize;
    float halfSize = (m_MapSize/2.0);

    // Warning: this won't work with multiple water planes
    m_WaterHeight = cmpWaterManager->GetExactWaterLevel(0,0);
    
    // Get the square we want to work on.
    i32 Xstart = clamp(m_updatei0, 0, (i32)m_MapSize-1);
    i32 Xend = clamp(m_updatei1, 0, (i32)m_MapSize-1);
    i32 Zstart = clamp(m_updatej0, 0, (i32)m_MapSize-1);
    i32 Zend = clamp(m_updatej1, 0, (i32)m_MapSize-1);

    if (m_WaveX == NULL)
    {
        m_WaveX = new float[m_MapSize*m_MapSize];
        m_WaveZ = new float[m_MapSize*m_MapSize];
        m_DistanceToShore = new float[m_MapSize*m_MapSize];
        m_FoamFactor = new float[m_MapSize*m_MapSize];
    }

    u16* heightmap = terrain->GetHeightMap();
    
    // some temporary stuff for wave intensity
    // not really used too much right now.
    //u8* waveForceHQ = new u8[mapSize*mapSize];

    // used to cache terrain normals since otherwise we'd recalculate them a lot (I'm blurring the "normal" map).
    // this might be updated to actually cache in the terrain manager but that's not for now.
    CVector3D* normals = new CVector3D[m_MapSize*m_MapSize];

    
    // taken out of the bottom loop, blurs the normal map
    // To remove if below is reactivated
    ssize_t blurZstart = Zstart-4 < 0 ? 0 : Zstart - 4;
    ssize_t blurZend = Zend+4 >= (ssize_t)m_MapSize ? (ssize_t)m_MapSize-1 : Zend + 4;
    ssize_t blurXstart = Xstart-4 < 0 ? 0 : Xstart - 4;
    ssize_t blurXend = Xend+4 >= (ssize_t)m_MapSize ? (ssize_t)m_MapSize-1 : Xend + 4;
    for (ssize_t j = blurZstart; j < blurZend; ++j)
    {
        for (ssize_t i = blurXstart; i < blurXend; ++i)
        {
            normals[j*m_MapSize + i] = terrain->CalcExactNormal(((float)i)*4.0f,((float)j)*4.0f);
        }
    }
    // TODO: reactivate?
    /*
    // calculate wave force (not really used right now)
    // and puts into "normals" the terrain normal at that point
    // so as to avoid recalculating terrain normals too often.
    for (ssize_t i = 0; i < mapSize; ++i)
    {
        for (ssize_t j = 0; j < mapSize; ++j)
        {
            normals[j*mapSize + i] = terrain->CalcExactNormal(((float)i)*4.0f,((float)j)*4.0f);
            if (circular && (i-halfSize)*(i-halfSize)+(j-halfSize)*(j-halfSize) > mSize)
            {
                waveForceHQ[j*mapSize + i] = 255;
                continue;
            }
            u8 color = 0;
            for (int v = 0; v <= 18; v += 3){
                if (j-v >= 0 && i-v >= 0 && heightmap[(j-v)*mapSize + i-v] > waterHeightInu16)
                {
                    if (color == 0)
                        color = 5;
                    else
                        color++;
                }
            }
            waveForceHQ[j*mapSize + i] = 255 - color * 40;
        }
    }
     */
    // this creates information for waves and stores it in float arrays. PatchRData then puts it in the vertex info for speed.
    for (ssize_t j = Zstart; j < Zend; ++j)
    {
        for (ssize_t i = Xstart; i < Xend; ++i)
        {
            if (circular && (i-halfSize)*(i-halfSize)+(j-halfSize)*(j-halfSize) > mSize)
            {
                m_WaveX[j*m_MapSize + i] = 0.0f;
                m_WaveZ[j*m_MapSize + i] = 0.0f;
                m_DistanceToShore[j*m_MapSize + i] = 100;
                m_FoamFactor[j*m_MapSize + i] = 0.0f;
                continue;
            }
            float depth = m_WaterHeight - heightmap[j*m_MapSize + i]*HEIGHT_SCALE;
            int distanceToShore = 10000;
            
            // calculation of the distance to the shore.
            // TODO: this is fairly dumb, though it returns a good result
            // Could be sped up a fair bit.
            if (depth >= 0)
            {
                // check in the square around.
                for (int yy = -5; yy <= 5; ++yy)
                {
                    for (int xx = -5; xx <= 5; ++xx)
                    {
                        if (i+xx >= 0 && i + xx < (long)m_MapSize)
                            if (j + yy >= 0 && j + yy < (long)m_MapSize)
                            {
                                float hereDepth = m_WaterHeight - heightmap[(j+yy)*m_MapSize + (i+xx)]*HEIGHT_SCALE;
                                if (hereDepth < 0 && xx*xx + yy*yy < distanceToShore)
                                    distanceToShore = xx*xx + yy*yy;
                            }
                    }
                }
                // refine the calculation if we're close enough
                if (distanceToShore < 9)
                {
                    for (float yy = -2.5f; yy <= 2.5f; ++yy)
                    {
                        for (float xx = -2.5f; xx <= 2.5f; ++xx)
                        {
                            float hereDepth = m_WaterHeight - terrain->GetExactGroundLevel( (i+xx)*4, (j+yy)*4 );
                            if (hereDepth < 0 && xx*xx + yy*yy < distanceToShore)
                                distanceToShore = xx*xx + yy*yy;
                        }
                    }
                }
            }
            else
            {
                for (int yy = -2; yy <= 2; ++yy)
                {
                    for (int xx = -2; xx <= 2; ++xx)
                    {
                        float hereDepth = m_WaterHeight - terrain->GetVertexGroundLevel(i+xx, j+yy);
                        if (hereDepth > 0)
                            distanceToShore = 0;
                    }
                }
                
            }
            // speedup with default values for land squares
            if (distanceToShore == 10000)
            {
                m_WaveX[j*m_MapSize + i] = 0.0f;
                m_WaveZ[j*m_MapSize + i] = 0.0f;
                m_DistanceToShore[j*m_MapSize + i] = 100;
                m_FoamFactor[j*m_MapSize + i] = 0.0f;
                continue;
            }
            // We'll compute the normals and the "water raise", to know about foam
            // Normals are a pretty good calculation but it's slow since we normalize so much.
            CVector3D normal;
            int waterRaise = 0;
            for (int yy = -4; yy <= 4; yy += 2)
            {
                for (int xx = -4; xx <= 4; xx += 2) // every 2 tile is good enough.
                {
                    if (j+yy < (long)m_MapSize && i+xx < (long)m_MapSize && i+xx >= 0 && j+yy >= 0)
                        normal += normals[(j+yy)*m_MapSize + (i+xx)];
                    if (terrain->GetVertexGroundLevel(i+xx,j+yy) < heightmap[j*m_MapSize + i]*HEIGHT_SCALE)
                        waterRaise += heightmap[j*m_MapSize + i]*HEIGHT_SCALE - terrain->GetVertexGroundLevel(i+xx,j+yy);
                }
            }
            // normalizes the terrain info to avoid foam moving at too different speeds.
            normal *= 0.012345679f;
            normal[1] = 0.1f;
            normal = normal.Normalized();

            m_WaveX[j*m_MapSize + i] = normal[0];
            m_WaveZ[j*m_MapSize + i] = normal[2];
            // distance is /5.0 to be a [0,1] value.

            m_DistanceToShore[j*m_MapSize + i] = sqrtf(distanceToShore)/5.0f; // TODO: this can probably be cached as I'm integer here.

            // computing the amount of foam I want

            depth = clamp(depth,0.0f,10.0f);
            float foamAmount = (waterRaise/255.0f) * (1.0f - depth/10.0f) /** (waveForceHQ[j*m_MapSize+i]/255.0f)*/ * (m_Waviness/8.0f);
            foamAmount += clamp(m_Waviness/2.0f - distanceToShore,0.0f,m_Waviness/2.0f)/(m_Waviness/2.0f) * clamp(m_Waviness/9.0f,0.3f,1.0f);
            foamAmount = foamAmount > 1.0f ? 1.0f: foamAmount;
            
            m_FoamFactor[j*m_MapSize + i] = foamAmount;
        }
    }

    delete[] normals;
    //delete[] waveForceHQ;
    
    // TODO: The rest should be cleaned up
    
    // okay let's create the waves squares. i'll divide the map in arbitrary squares
    // For each of these squares, check if waves are needed.
    // If yes, look for the best positionning (in order to have a nice blending with the shore)
    // Then clean-up: remove squares that are too close to each other
    
    std::vector<CVector2D> waveSquares;
    
    int size = 8;   // I think this is the size of the squares.
    for (size_t j = 0; j < m_MapSize/size; ++j)
    {
        for (size_t i = 0; i < m_MapSize/size; ++i)
        {
            int landTexel = 0;
            int waterTexel = 0;
            CVector3D avnormal (0.0f,0.0f,0.0f);
            CVector2D landPosition(0.0f,0.0f);
            CVector2D waterPosition(0.0f,0.0f);
            for (int yy = 0; yy < size; ++yy)
            {
                for (int xx = 0; xx < size; ++xx)
                {
                    if (terrain->GetVertexGroundLevel(i*size+xx,j*size+yy) > m_WaterHeight)
                    {
                        landTexel++;
                        landPosition += CVector2D(i*size+xx,j*size+yy);
                    }
                    else
                    {
                        waterPosition += CVector2D(i*size+xx,j*size+yy);
                        waterTexel++;
                        avnormal += terrain->CalcExactNormal( (i*size+xx)*4.0f,(j*size+yy)*4.0f);
                    }
                }
            }
            if (landTexel < size/2)
                continue;

            landPosition /= landTexel;
            waterPosition /= waterTexel;
            
            avnormal[1] = 1.0f;
            avnormal.Normalize();
            avnormal[1] = 0.0f;
            
            // this should help ensure that the shore is pretty flat.
            if (avnormal.Length() <= 0.2f)
                continue;
            
            // To get the best position for squares, I start at the mean "ocean" position
            // And step by step go to the mean "land" position. I keep the position where I change from water to land.
            // If this never happens, the square is scrapped.
            if (terrain->GetExactGroundLevel(waterPosition.X*4.0f,waterPosition.Y*4.0f) > m_WaterHeight)
                continue;
            
            CVector2D squarePos(-1,-1);
            for (u8 i = 0; i < 40; i++)
            {
                squarePos = landPosition * (i/40.0f) + waterPosition * (1.0f-(i/40.0f));
                if (terrain->GetExactGroundLevel(squarePos.X*4.0f,squarePos.Y*4.0f) > m_WaterHeight)
                    break;
            }
            if (squarePos.X == -1)
                continue;
            
            u8 enter = 1;
            // okaaaaaay. Got a square. Check for proximity.
            for (unsigned long i = 0; i < waveSquares.size(); i++)
            {
                if ( CVector2D(waveSquares[i]-squarePos).LengthSquared() < 80) {
                    enter = 0;
                    break;
                }
            }
            if (enter == 1)
                waveSquares.push_back(squarePos);
        }
    }
    
    // Actually create the waves' meshes.
    std::vector<SWavesVertex> waves_vertex_data;
    std::vector<GLushort> waves_indices;
    
    // loop through each square point. Look in the square around it, calculate the normal
    // create the square.
    for (unsigned long i = 0; i < waveSquares.size(); i++)
    {
        CVector2D pos(waveSquares[i]);
        
        CVector3D avgnorm(0.0f,0.0f,0.0f);
        for (int yy = -size/2; yy < size/2; ++yy)
        {
            for (int xx = -size/2; xx < size/2; ++xx)
            {
                avgnorm += terrain->CalcExactNormal((pos.X+xx)*4.0f,(pos.Y+yy)*4.0f);
            }
        }
        avgnorm[1] = 0.1f;
        // okay crank out a square.
        // we have the direction of the square. We'll get the perpendicular vector too
        CVector2D perp(-avgnorm[2],avgnorm[0]);
        perp = perp.Normalized();
        avgnorm = avgnorm.Normalized();
        
        SWavesVertex vertex[4];
        vertex[0].m_Position = CVector3D(pos.X + perp.X*(size/2.2f) - avgnorm[0]*1.0f, 0.0f,pos.Y + perp.Y*(size/2.2f) - avgnorm[2]*1.0f);
        vertex[0].m_Position *= 4.0f;
        vertex[0].m_Position.Y = m_WaterHeight + 1.0f;
        vertex[0].m_UV[1] = 1;
        vertex[0].m_UV[0] = 0;
        
        vertex[1].m_Position = CVector3D(pos.X - perp.X*(size/2.2f) - avgnorm[0]*1.0f, 0.0f,pos.Y - perp.Y*(size/2.2f) - avgnorm[2]*1.0f);
        vertex[1].m_Position *= 4.0f;
        vertex[1].m_Position.Y = m_WaterHeight + 1.0f;
        vertex[1].m_UV[1] = 1;
        vertex[1].m_UV[0] = 1;
        
        vertex[3].m_Position = CVector3D(pos.X + perp.X*(size/2.2f) + avgnorm[0]*(size/1.5f), 0.0f,pos.Y + perp.Y*(size/2.2f) + avgnorm[2]*(size/1.5f));
        vertex[3].m_Position *= 4.0f;
        vertex[3].m_Position.Y = m_WaterHeight + 1.0f;
        vertex[3].m_UV[1] = 0;
        vertex[3].m_UV[0] = 0;
        
        vertex[2].m_Position = CVector3D(pos.X - perp.X*(size/2.2f) + avgnorm[0]*(size/1.5f), 0.0f,pos.Y - perp.Y*(size/2.2f) + avgnorm[2]*(size/1.5f));
        vertex[2].m_Position *= 4.0f;
        vertex[2].m_Position.Y = m_WaterHeight + 1.0f;
        vertex[2].m_UV[1] = 0;
        vertex[2].m_UV[0] = 1;
        
        waves_indices.push_back(waves_vertex_data.size());
        waves_vertex_data.push_back(vertex[0]);
        waves_indices.push_back(waves_vertex_data.size());
        waves_vertex_data.push_back(vertex[1]);
        waves_indices.push_back(waves_vertex_data.size());
        waves_vertex_data.push_back(vertex[2]);
        waves_indices.push_back(waves_vertex_data.size());
        waves_vertex_data.push_back(vertex[3]);
    }

    // no vertex buffers if no data generated
    if (waves_indices.empty())
        return;

    // waves
    // allocate vertex buffer
    m_VBWaves = g_VBMan.Allocate(sizeof(SWavesVertex), waves_vertex_data.size(), GL_STATIC_DRAW, GL_ARRAY_BUFFER);
    m_VBWaves->m_Owner->UpdateChunkVertices(m_VBWaves, &waves_vertex_data[0]);

    // Construct indices buffer
    m_VBWavesIndices = g_VBMan.Allocate(sizeof(GLushort), waves_indices.size(), GL_STATIC_DRAW, GL_ELEMENT_ARRAY_BUFFER);
    m_VBWavesIndices->m_Owner->UpdateChunkVertices(m_VBWavesIndices, &waves_indices[0]);
}

////////////////////////////////////////////////////////////////////////
// This will always recalculate for now
void WaterManager::SetMapSize(size_t size)
{
    // TODO: Im' blindly trusting the user here.
    m_MapSize = size;
    m_NeedInfoUpdate = true;
    m_updatei0 = 0;
    m_updatei1 = size;
    m_updatej0 = 0;
    m_updatej1 = size;
    
    SAFE_ARRAY_DELETE(m_WaveX);
    SAFE_ARRAY_DELETE(m_WaveZ);
    SAFE_ARRAY_DELETE(m_DistanceToShore);
    SAFE_ARRAY_DELETE(m_FoamFactor);
}

////////////////////////////////////////////////////////////////////////
// This will set the bools properly
void WaterManager::UpdateQuality()
{
    if (g_Renderer.GetOptionBool(CRenderer::OPT_WATERNORMAL) != m_WaterNormal) {
        m_WaterNormal = g_Renderer.GetOptionBool(CRenderer::OPT_WATERNORMAL);
        m_NeedsReloading = true;
    }
    if (g_Renderer.GetOptionBool(CRenderer::OPT_WATERREALDEPTH) != m_WaterRealDepth) {
        m_WaterRealDepth = g_Renderer.GetOptionBool(CRenderer::OPT_WATERREALDEPTH);
        m_NeedsReloading = true;
    }
    if (g_Renderer.GetOptionBool(CRenderer::OPT_WATERFOAM) != m_WaterFoam) {
        m_WaterFoam = g_Renderer.GetOptionBool(CRenderer::OPT_WATERFOAM);
        m_NeedsReloading = true;
        m_NeedInfoUpdate = true;
    }
    if (g_Renderer.GetOptionBool(CRenderer::OPT_WATERCOASTALWAVES) != m_WaterCoastalWaves) {
        m_WaterCoastalWaves = g_Renderer.GetOptionBool(CRenderer::OPT_WATERCOASTALWAVES);
        m_NeedsReloading = true;
        m_NeedInfoUpdate = true;
    }
    if (g_Renderer.GetOptionBool(CRenderer::OPT_WATERREFRACTION) != m_WaterRefraction) {
        m_WaterRefraction = g_Renderer.GetOptionBool(CRenderer::OPT_WATERREFRACTION);
        m_NeedsReloading = true;
    }
    if (g_Renderer.GetOptionBool(CRenderer::OPT_WATERREFLECTION) != m_WaterReflection) {
        m_WaterReflection = g_Renderer.GetOptionBool(CRenderer::OPT_WATERREFLECTION);
        m_NeedsReloading = true;
    }
    if (g_Renderer.GetOptionBool(CRenderer::OPT_WATERSHADOW) != m_WaterShadows) {
        m_WaterShadows = g_Renderer.GetOptionBool(CRenderer::OPT_WATERSHADOW);
        m_NeedsReloading = true;
    }
}

bool WaterManager::WillRenderFancyWater()
{
    if (!g_Renderer.GetCapabilities().m_FragmentShader)
        return false;
    if (!m_RenderWater)
        return false;
    return true;
}