doxygen/html/_terrain_8cpp_source.html

 /*  Project Starshatter 4.5

-         Destroyer Studios LLC

-         Copyright � 1997-2005. All Rights Reserved.

-

-         SUBSYSTEM:    Stars.exe

-         FILE:         Terrain.cpp

-         AUTHOR:       John DiCamillo

-

-

-         OVERVIEW

-         ========

- */

-

- #include "MemDebug.h"

- #include "Terrain.h"

- #include "TerrainApron.h"

- #include "TerrainClouds.h"

- #include "TerrainLayer.h"

- #include "TerrainPatch.h"

- #include "TerrainRegion.h"

- #include "Water.h"

-

- #include "CameraView.h"

- #include "Projector.h"

- #include "Scene.h"

- #include "Bitmap.h"

- #include "DataLoader.h"

- #include "Game.h"

- #include "MachineInfo.h"

-

- // +--------------------------------------------------------------------+

-

- int   Terrain::detail_level      = 3; // default = MEDIUM DETAIL

-

- const int PATCH_SIZE             = 16;

-

- // +--------------------------------------------------------------------+

-

- Terrain::Terrain(TerrainRegion* trgn)

- : region(trgn), patches(0), water_patches(0), water(0),

- aprons(0), clouds(0), terrain_normals(0)

- {

-         detail_frame      = 0;

-         datapath          = "Galaxy/";

-         terrain_texture   = 0;

-         apron_texture     = 0;

-         water_texture     = 0;

-

-         for (int i = 0; i < 2; i++) {

-                 cloud_texture[i] = 0;

-                 shade_texture[i] = 0;

-                 noise_texture[i] = 0;

-         }

-

-         if (region) {

-                 scale    = region->LateralScale();

-                 mtnscale = region->MountainScale();

-

-                 ListIter<TerrainLayer> iter = region->GetLayers();

-                 while (++iter) {

-                         TerrainLayer* orig = iter.value();

-                         TerrainLayer* copy = new(__FILE__,__LINE__) TerrainLayer;

-                         *copy = *orig;

-                         layers.append(copy);

-                 }

-

-                 layers.sort();

-         }

-

-         else {

-                 scale    = 1;

-                 mtnscale = 1;

-         }

- }

-

- // +--------------------------------------------------------------------+

-

- Terrain::~Terrain()

- {

-         int i, j;

-

-         if (patches)

-         for (i = 0; i < subdivisions; i++)

-         for (j = 0; j < subdivisions; j++)

-         GRAPHIC_DESTROY(patches[i*subdivisions+j]);

-

-         if (water_patches)

-         for (i = 0; i < subdivisions; i++)

-         for (j = 0; j < subdivisions; j++)

-         GRAPHIC_DESTROY(water_patches[i*subdivisions+j]);

-

-         if (aprons)

-         for (i = 0; i < 8; i++)

-         GRAPHIC_DESTROY(aprons[i]);

-

-         if (clouds)

-         for (i = 0; i < nclouds; i++)

-         GRAPHIC_DESTROY(clouds[i]);

-

-         if (water)

-         for (i = 0; i < 6; i++)

-         delete water[i];

-

-         delete [] aprons;

-         delete [] clouds;

-         delete [] patches;

-         delete [] water;

-         delete [] terrain_normals;

-

-         terrain_patch.ClearImage();

-         terrain_apron.ClearImage();

-

-         layers.destroy();

- }

-

- // +--------------------------------------------------------------------+

-

- void

- Terrain::BuildTerrain()

- {

-         DataLoader* loader = DataLoader::GetLoader();

-         loader->SetDataPath(datapath);

-         loader->LoadBitmap( region->PatchName(),     terrain_patch);

-         loader->LoadBitmap( region->ApronName(),     terrain_apron);

-         loader->LoadTexture(region->PatchTexture(),  terrain_texture);

-         loader->LoadTexture(region->ApronTexture(),  apron_texture);

-         if (region->WaterTexture().length()) {

-                 loader->LoadTexture(region->WaterTexture(),  water_texture);

-

-                 if (region->EnvironmentTexture(0).length() > 0) {

-                         loader->LoadTexture(region->EnvironmentTexture(0), env_texture[0]);

-                         loader->LoadTexture(region->EnvironmentTexture(1), env_texture[1]);

-                         loader->LoadTexture(region->EnvironmentTexture(2), env_texture[2]);

-                         loader->LoadTexture(region->EnvironmentTexture(3), env_texture[3]);

-                         loader->LoadTexture(region->EnvironmentTexture(4), env_texture[4]);

-                         loader->LoadTexture(region->EnvironmentTexture(5), env_texture[5]);

-                 }

-         }

-

-         loader->LoadTexture(region->CloudsHigh(),    cloud_texture[0], Bitmap::BMP_TRANSLUCENT);

-         loader->LoadTexture(region->CloudsLow(),     cloud_texture[1], Bitmap::BMP_TRANSLUCENT);

-         loader->LoadTexture(region->ShadesLow(),     shade_texture[1], Bitmap::BMP_TRANSLUCENT);

-

-         if (region->DetailTexture0().length())

-         loader->LoadTexture(region->DetailTexture0(),noise_texture[0], Bitmap::BMP_TRANSLUCENT, false, true);

-

-         if (region->DetailTexture1().length())

-         loader->LoadTexture(region->DetailTexture1(),noise_texture[1], Bitmap::BMP_TRANSLUCENT, false, true);

-

-         subdivisions   = terrain_patch.Width() / PATCH_SIZE;

-         patch_size     = terrain_patch.Width() / subdivisions;

-

-         BuildNormals();

-

-         int     i, j;

-         int     ntiles = terrain_patch.Width()/2 * terrain_patch.Height()/2;

-         double  dx     = scale * patch_size;

-         double  dz     = scale * patch_size;

-         double  offset = -subdivisions/2;

-

-         if (water_texture) {

-                 water = new(__FILE__,__LINE__) Water*[6];

-                 for (i = 0; i < 6; i++) {

-                         water[i] = new(__FILE__,__LINE__) Water();

-                         int n = (1<<i) + 1;

-                         water[i]->Init(n, (float) (scale*patch_size), 90.0f);

-                 }

-         }

-

-         // load tile textures:

-         for (i = 0; i < layers.size(); i++) {

-                 TerrainLayer* layer = layers.at(i);

-

-                 if (i < layers.size()-1)

-                 layer->max_height = layers.at(i+1)->min_height;

-                 else

-                 layer->max_height = 1e6;

-

-                 if (layer->tile_name.length())

-                 loader->LoadTexture(layer->tile_name, layer->tile_texture);

-

-                 if (layer->detail_name.length())

-                 loader->LoadTexture(layer->detail_name, layer->detail_texture);

-         }

-

-         patches = new(__FILE__,__LINE__) TerrainPatch*[subdivisions*subdivisions];

-

-         if (water_texture)

-         water_patches = new(__FILE__,__LINE__) TerrainPatch*[subdivisions*subdivisions];

-

-         for (i = 0; i < subdivisions; i++) {

-                 for (j = 0; j < subdivisions; j++) {

-                         int j1 = subdivisions - j;

-                         Rect rect(j * patch_size, i * patch_size, patch_size, patch_size);

-                         Point p1((j1 + offset  )*dx, 0,        (i + offset  )*dz);

-                         Point p2((j1 + offset+1)*dx, mtnscale, (i + offset+1)*dz);

-

-                         int index = i*subdivisions+j;

-                         patches[index] = new(__FILE__,__LINE__) TerrainPatch(this, &terrain_patch, rect, p1, p2);

-

-                         if (water_texture && patches[index]->MinHeight() < 3)

-                         water_patches[index] = new(__FILE__,__LINE__) TerrainPatch(this, rect, p1, p2, 30);

-

-                         else if (water_patches != 0)

-                         water_patches[index] = 0;

-                 }

-         }

-

-         int a      = 0;

-         dx     = scale * terrain_patch.Width();

-         dz     = scale * terrain_patch.Height();

-         offset = -3.0/2;

-         double xoffset = offset + 1.0/16.0;

-

-         aprons = new(__FILE__,__LINE__) TerrainApron*[8];

-

-         for (i = 0; i < 3; i++) {

-                 for (j = 0; j < 3; j++) {

-                         int j1 = 2 - j;

-                         if (i != 1 || j1 != 1) {

-                                 Rect rect(j * subdivisions, i * subdivisions, subdivisions, subdivisions);

-                                 Point p1((j1 + xoffset  )*dx, 0,        (i + offset  )*dz);

-                                 Point p2((j1 + xoffset+1)*dx, mtnscale, (i + offset+1)*dz);

-

-                                 aprons[a++] = new(__FILE__,__LINE__) TerrainApron(this, &terrain_apron, rect, p1, p2);

-                         }

-                 }

-         }

-

-         Weather::STATE state = region->GetWeather().State();

-

-         if (state == Weather::HIGH_CLOUDS || state == Weather::MODERATE_CLOUDS) {

-                 double altitude = region->CloudAltHigh();

-                 nclouds = 9;

-

-                 if (state == Weather::MODERATE_CLOUDS)

-                 nclouds *= 2;

-

-                 clouds = new(__FILE__,__LINE__) TerrainClouds*[nclouds];

-

-                 a = 0;

-                 for (i = 0; i < 3; i++) {

-                         for (j = 0; j < 3; j++) {

-                                 clouds[a] = new(__FILE__,__LINE__) TerrainClouds(this, 0);

-

-                                 double xloc = (j-1) * 75000 + (rand()/32768.0 - 0.5) * 50000;

-                                 double yloc = (i-1) * 75000 + (rand()/32768.0 - 0.5) * 50000;

-

-                                 clouds[a]->MoveTo(Point(xloc, altitude, yloc));

-                                 a++;

-                         }

-                 }

-

-                 if (state == Weather::MODERATE_CLOUDS) {

-                         altitude = region->CloudAltLow();

-

-                         for (i = 0; i < 3; i++) {

-                                 for (j = 0; j < 3; j++) {

-                                         clouds[a] = new(__FILE__,__LINE__) TerrainClouds(this, 1);

-

-                                         double xloc = (j-1) * 75000 + (rand()/32768.0 - 0.5) * 50000;

-                                         double yloc = (i-1) * 75000 + (rand()/32768.0 - 0.5) * 50000;

-

-                                         clouds[a]->MoveTo(Point(xloc, altitude, yloc));

-                                         a++;

-                                 }

-                         }

-                 }

-         }

- }

-

- // +--------------------------------------------------------------------+

-

- void

- Terrain::BuildNormals()

- {

-         if (terrain_normals) {

-                 delete [] terrain_normals;

-                 terrain_normals = 0;

-         }

-

-         int    i, x, y;

-

-         int    w      = terrain_patch.Width();

-         int    h      = terrain_patch.Height();

-         Color* pix    = terrain_patch.HiPixels();

-         BYTE*  alt    = new(__FILE__,__LINE__) BYTE[h*w];

-         int    nverts = w * h;

-         double scale  = region->MountainScale() / (region->LateralScale() * 2.0);

-

-         terrain_normals = new(__FILE__,__LINE__) Vec3B[nverts];

-

-         ZeroMemory(terrain_normals, sizeof(Vec3B) * nverts);

-

-         for (i = 0; i < w; i++) {

-                 alt            [          i] = 0;

-                 alt            [(h-1)*w + i] = 0;

-                 terrain_normals[          i] = Vec3B(128,128,255);

-                 terrain_normals[(h-1)*w + i] = Vec3B(128,128,255);

-         }

-

-         for (i = 0; i < h; i++) {

-                 alt            [i*w        ] = 0;

-                 alt            [i*w + (w-1)] = 0;

-                 terrain_normals[i*w        ] = Vec3B(128,128,255);

-                 terrain_normals[i*w + (w-1)] = Vec3B(128,128,255);

-         }

-

-         for (y = 1; y < h-1; y++) {

-                 for (x = 1; x < w-1; x++) {

-                         alt[y*w+x] = (BYTE) pix[y*w+x].Red();

-                 }

-         }

-

-         for (y = 1; y < h-1; y++) {

-                 for (x = 1; x < w-1; x++) {

-                         double dx = (alt[y*w     + (x-1)] - alt[y*w     + (x+1)]) * scale +

-                         (alt[(y-1)*w + (x-1)] - alt[(y-1)*w + (x+1)]) * scale * 0.5 +

-                         (alt[(y+1)*w + (x-1)] - alt[(y+1)*w + (x+1)]) * scale * 0.5;

-

-                         double dy = (alt[(y-1)*w + x    ] - alt[(y+1)*w + x    ]) * scale +

-                         (alt[(y-1)*w + (x-1)] - alt[(y+1)*w + (x-1)]) * scale * 0.5 +

-                         (alt[(y-1)*w + (x+1)] - alt[(y+1)*w + (x+1)]) * scale * 0.5;

-

-                         Point norm(dx,dy,1);

-                         norm.Normalize();

-

-                         Vec3B* tnorm = &terrain_normals[y*w + x];

-

-                         tnorm->x = (BYTE) (norm.x * 127 + 128);

-                         tnorm->y = (BYTE) (norm.y * 127 + 128);

-                         tnorm->z = (BYTE) (norm.z * 127 + 128);

-

-                         double foo = dx/dy;

-                 }

-         }

-

-         delete [] alt;

- }

-

- // +--------------------------------------------------------------------+

-

- void

- Terrain::Activate(Scene& scene)

- {

-         int i, j;

-

-         StarSystem* system = region->System();

-         if (system)

-         datapath = system->GetDataPath();

-

-         region->GetWeather().Update();

-

-         if (!patches)

-         BuildTerrain();

-

-         if (patches) {

-                 for (i = 0; i < subdivisions; i++)

-                 for (j = 0; j < subdivisions; j++)

-                 if (patches[i*subdivisions+j])

-                 scene.AddGraphic(patches[i*subdivisions+j]);

-         }

-

-         if (water_patches) {

-                 for (i = 0; i < subdivisions; i++)

-                 for (j = 0; j < subdivisions; j++)

-                 if (water_patches[i*subdivisions+j])

-                 scene.AddGraphic(water_patches[i*subdivisions+j]);

-         }

-

-         if (aprons) {

-                 for (i = 0; i < 8; i++)

-                 if (aprons[i])

-                 scene.AddGraphic(aprons[i]);

-         }

-

-         if (clouds) {

-                 for (i = 0; i < nclouds; i++)

-                 if (clouds[i])

-                 scene.AddGraphic(clouds[i]);

-         }

- }

-

- void

- Terrain::Deactivate(Scene& scene)

- {

-         int i, j;

-

-         if (patches) {

-                 for (i = 0; i < subdivisions; i++) {

-                         for (j = 0; j < subdivisions; j++) {

-                                 TerrainPatch* p = patches[i*subdivisions+j];

-

-                                 if (p) {

-                                         p->DeletePrivateData();

-                                         scene.DelGraphic(p);

-                                 }

-                         }

-                 }

-         }

-

-         if (water_patches) {

-                 for (i = 0; i < subdivisions; i++) {

-                         for (j = 0; j < subdivisions; j++) {

-                                 TerrainPatch* p = water_patches[i*subdivisions+j];

-

-                                 if (p) {

-                                         p->DeletePrivateData();

-                                         scene.DelGraphic(p);

-                                 }

-                         }

-                 }

-         }

-

-         if (aprons) {

-                 for (i = 0; i < 8; i++)

-                 if (aprons[i])

-                 scene.DelGraphic(aprons[i]);

-         }

-

-         if (clouds) {

-                 for (i = 0; i < nclouds; i++)

-                 if (clouds[i])

-                 scene.DelGraphic(clouds[i]);

-         }

-

-         StarSystem* system = region->System();

-

-         // restore sunlight color and brightness on exit:

-         if (system) {

-                 system->RestoreTrueSunColor();

-         }

- }

-

- // +--------------------------------------------------------------------+

-

- void

- Terrain::ExecFrame(double seconds)

- {

-         if (water) {

-                 for (int i = 0; i < 6; i++) {

-                         if (water[i])

-                         water[i]->CalcWaves(seconds);

-                 }

-         }

- }

-

- // +--------------------------------------------------------------------+

-

- void

- Terrain::SelectDetail(Projector* projector)

- {

-         if (!patches)

-         return;

-

-         if (detail_frame >= Game::Frame())

-         return;

-

-         // compute detail map:

-         int  x, z;

-

-         for (z = 0; z < subdivisions; z++) {

-                 for (x = 0; x < subdivisions; x++) {

-                         TerrainPatch*  patch    = patches[z*subdivisions + x];

-                         int            ndetail  = 0;

-                         Point          loc      = patch->Location();

-                         float          radius   = patch->Radius();

-

-                         if (loc.length() < 2*radius) {

-                                 ndetail = detail_level;

-                         }

-

-                         else {

-                                 double threshold = 4; //16;

-

-                                 for (int level = 1; level <= detail_level; level++) {

-                                         double feature_size = radius / (1 << level);

-

-                                         if (projector->ApparentRadius(loc, (float) feature_size) > threshold)

-                                         ndetail = level;

-                                 }

-                         }

-

-                         patch->SetDetailLevel(ndetail);

-

-                         if (water_patches) {

-                                 patch = water_patches[z*subdivisions + x];

-                                 if (patch)

-                                 patch->SetDetailLevel(ndetail);

-                         }

-                 }

-         }

-

-         // compute fog fade level:

-         double hour  = region->DayPhase();

-

-         if (hour < 12)

-         fog_fade = (hour)  / 12.0;

-         else

-         fog_fade = (24-hour) / 12.0;

-

-         fog_fade = fog_fade * (1-region->HazeFade()) + region->HazeFade();

-

-         detail_frame = Game::Frame();

- }

-

- // +--------------------------------------------------------------------+

-

- double

- Terrain::Height(double x, double y) const

- {

-         double h = 0;

-

-         if (patches) {

-                 int ix = (int) floor(x / (patch_size * scale));

-                 int iy = (int) floor(y / (patch_size * scale));

-

-                 double px = x - ix * patch_size * scale;

-                 double py = y - iy * patch_size * scale;

-

-                 ix = subdivisions/2 - ix;

-                 iy = subdivisions/2 + iy;

-

-                 TerrainPatch* patch = 0;

-

-                 if (ix >= 0 && ix < subdivisions &&

-                                 iy >= 0 && iy < subdivisions)

-                 patch = patches[iy*subdivisions+ix];

-

-                 if (patch)

-                 h = patch->Height(px, py);

-         }

-

-         if (water_patches && h < 30)

-         h = 30;

-

-         return h;

- }

-

- // +--------------------------------------------------------------------+

-

- void

- Terrain::SetDetailLevel(int detail)

- {

-         if (detail >= 1 && detail <= 4) {

-

-                 // limit detail on low memory machines:

-                 if (detail > 3 && MachineInfo::GetTotalRam() < 64)

-                 detail = 3;

-

-                 detail_level = detail;

-         }

- }

-

- // +--------------------------------------------------------------------+

-

- bool

- Terrain::IsFirstPatch(TerrainPatch* p) const

- {

-         return (patches && *patches == p);

- }

-