AlphaImage* AlphaImage::CreateMipmap ()
{
if (w == 1 && h == 1)
return 0;
int nw = w/2;
int nh = h/2;
if (!nw) { nw = 1; }
if (!nh) { nh = 1; }
AlphaImage *mipmap = SAFE_NEW AlphaImage;
mipmap->Alloc (nw,nh);
// Scale X&Y
if (w > 1 && h > 1) {
for (int y=0;y<nh;y++)
for (int x=0;x<nw;x++)
mipmap->at (x,y) = (at(x*2,y*2) + at(x*2+1,y*2) + at(x*2, y*2+1) + at(x*2+1,y*2+1)) * 0.25f;
} else if (w == 1 && h > 1) { // Scale Y only
for (int y=0;y<nh;y++)
for (int x=0;x<nw;x++)
mipmap->at (x,y) = (at(x,y*2) + at(x, y*2+1)) * 0.5f;
} else { // if (w > 1 && h == 1) {
for (int y=0;y<nh;y++) // Scale X only
for (int x=0;x<nw;x++)
mipmap->at (x,y) = (at(x*2,y) + at(x*2+1, y)) * 0.5f;
}
return mipmap;
}
void TerrainTexture::Load (const TdfParser *tdf, Heightmap *heightmap, TQuad *quadtree, const vector<QuadMap*>& qmaps, Config *cfg, ILoadCallback *cb, LightingInfo *li)
{
string basepath="MAP\\TERRAIN\\";
if (cb) cb->PrintMsg (" parsing texture stages...");
if (!GLEW_ARB_multitexture)
throw std::runtime_error ("No multitexture avaiable");
if (!GLEW_ARB_texture_env_combine)
throw std::runtime_error ("Texture env combine extension not avaiable");
heightmapW = heightmap->w;
tdfParser = tdf;
shaderDef.Parse(*tdf, cfg->useBumpMaps);
shaderDef.useShadowMapping = cfg->useShadowMaps;
optimizeEpsilon = atof(tdf->SGetValueDef ("0.04", basepath + "LayerOptimizeConst").c_str());
if (optimizeEpsilon < 0.0f) optimizeEpsilon = 0.0f;
// Load textures
map<string, BaseTexture*> nametbl;
if (cb) cb->PrintMsg (" loading textures and blendmaps...");
bool hasBumpmaps = false;
for (int a=0;a<shaderDef.stages.size();a++)
{
ShaderDef::Stage* st = &shaderDef.stages [a];
// Already loaded?
if (nametbl.find (st->sourceName) == nametbl.end())
nametbl[st->sourceName] = LoadImageSource(st->sourceName, basepath, heightmap, cb, cfg);
st->source = nametbl[st->sourceName];
std::string bm;
if (tdf->SGetValue (bm, basepath + st->sourceName + "\\Bumpmap"))
hasBumpmaps = true;
}
if (cfg->useBumpMaps && hasBumpmaps)
{
for (int a=0;a<shaderDef.normalMapStages.size();a++)
{
ShaderDef::Stage* st = &shaderDef.normalMapStages [a];
string name = st->sourceName;
if (st->operation != ShaderDef::Alpha)
name += "_BM"; // make it unique, this whole naming thing is very hackish though..
// Already loaded?
if (nametbl.find (name) == nametbl.end()) {
// load a bumpmap unless it's an alpha operation
st->source = LoadImageSource(st->sourceName, basepath,
heightmap, cb, cfg, st->operation != ShaderDef::Alpha);
if (!st->source) {
if (!flatBumpmap) {
flatBumpmap = TiledTexture::CreateFlatBumpmap();
textures.push_back (flatBumpmap);
}
st->source = flatBumpmap;
}
st->sourceName = st->source->name;
nametbl[st->sourceName] = st->source;
}
st->source = nametbl[st->sourceName];
}
}
else cfg->useBumpMaps = false;
// Generate blendmap mipmaps
deque<AlphaImage*>* bmMipmaps = SAFE_NEW deque<AlphaImage*>[blendMaps.size()];
GenerateInfo gi;
gi.bmMipmaps = bmMipmaps;
if (cb) { cb->PrintMsg (" generating blendmap mipmaps..."); }
for (int a=0;a<blendMaps.size();a++) {
Blendmap *bm = blendMaps[a];
AlphaImage *cur = bm->image;
bm->image = 0;
do {
bmMipmaps[a].push_front (cur);
cur = cur->CreateMipmap ();
} while (cur);
for (int c=0;c<bmMipmaps[a].size();c++)
if (bmMipmaps[a][c]->w == QUAD_W) {
gi.testlod.push_back (c);
break;
}
}
if (cb) cb->PrintMsg (" loading blendmaps into OpenGL...");
// Convert to textures
for (int a=0;a<blendMaps.size();a++) {
AlphaImage *bm = bmMipmaps[a].back();
// Save image
if (blendMaps[a]->generatorInfo) {
char fn[32];
SNPRINTF (fn,32, "blendmap%d.jpg", a);
remove(fn);
bm->Save (fn);
}
// Upload
glGenTextures (1, &blendMaps[a]->id);
glBindTexture (GL_TEXTURE_2D, blendMaps[a]->id);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
if (cfg->anisotropicFiltering > 0.0f)
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, cfg->anisotropicFiltering);
deque<AlphaImage*>& mipmaps = bmMipmaps[a];
for (int d=0;d<mipmaps.size();d++) {
AlphaImage *lod = mipmaps[mipmaps.size()-d-1];
glTexImage2D (GL_TEXTURE_2D, d, GL_ALPHA, lod->w, lod->h, 0, GL_ALPHA, GL_FLOAT, lod->data);
}
blendMaps[a]->image = 0;
}
// Create texture application object
if (!cfg->forceFallbackTexturing && GLEW_ARB_fragment_shader && GLEW_ARB_vertex_shader &&
GLEW_ARB_shader_objects && GLEW_ARB_shading_language_100) {
shaderHandler = SAFE_NEW GLSLShaderHandler;
} else {
// texture_env_combine as fallback
shaderHandler = SAFE_NEW TexEnvSetupHandler;
}
// Calculate shadows
if (cfg->useStaticShadow) {
if (cb) cb->PrintMsg(" calculating lightmap");
lightmap = SAFE_NEW Lightmap(heightmap, 2, 1,li);
}
// see how lighting should be implemented, based on config and avaiable textures
InstantiateShaders(cfg, cb);
if (cb) { cb->PrintMsg (" initializing terrain node shaders..."); }
CreateTexProg (quadtree, &gi);
shaderHandler->EndBuild();
// count passes
maxPasses = 0;
for (map<uint, RenderSetupCollection*>::iterator mi=gi.nodesetup.begin();mi!=gi.nodesetup.end();++mi) {
for (int i = 0; i < mi->second->renderSetup.size(); i++) {
RenderSetup *rs = mi->second->renderSetup[i];
if (rs->passes.size () > maxPasses) {
maxPasses = rs->passes.size();
}
}
texNodeSetup.push_back (mi->second);
}
if (cb) cb->PrintMsg (" deleting temporary blendmap data...");
// Free blendmap mipmap images
for (int a=0;a<blendMaps.size();a++) {
for (deque<AlphaImage*>::iterator i=bmMipmaps[a].begin();i!=bmMipmaps[a].end();++i) {
delete *i;
}
}
delete[] bmMipmaps;
if (cfg->useShadowMaps) {
shadowMapParams = SAFE_NEW ShadowMapParams;
}
}
void Blendmap::Generate(Heightmap* rootHm, int lodLevel, float hmScale, float hmOffset)
{
const Heightmap* heightmap = rootHm->GetLevel(-lodLevel);
// Allocate the blendmap image
AlphaImage* bm = new AlphaImage;
bm->Alloc(heightmap->w-1, heightmap->h-1); // texture dimensions have to be power-of-two
Blendmap::GeneratorInfo* gi = generatorInfo;
// Calculate blend factors using the function parameters and heightmap input:
for (int y=0;y<bm->h;y++)
{
for (int x=0;x<bm->w;x++)
{
const float h = (heightmap->atSynced(x, y) - hmOffset) / hmScale;
float factor=1.0f;
if(h < gi->minHeight - gi->minHeightFuzzy) {
bm->at(x,y) = 0.0f;
continue;
} else if (gi->minHeightFuzzy > 0.0f && h < gi->minHeight + gi->minHeightFuzzy)
factor = (h - (gi->minHeight - gi->minHeightFuzzy)) / (2.0f * gi->minHeightFuzzy);
if(h > gi->maxHeight + gi->maxHeightFuzzy) {
bm->at (x,y) = 0.0f;
continue;
} else if (gi->maxHeightFuzzy > 0.0f && h > gi->maxHeight - gi->maxHeightFuzzy)
factor *= ((gi->maxHeight + gi->maxHeightFuzzy) - h) / (2.0f * gi->maxHeightFuzzy);
float norm_y = 0.0f;
if (heightmap->normalData) {
const uchar* cnorm = heightmap->GetNormal(x, y);
norm_y = cnorm[1] / 255.0f * 2.0f - 1.0f;
if (norm_y > 1.0f) norm_y = 1.0f;
} else {
Vector3 tangent, binormal;
CalculateTangents(heightmap, x,y,tangent,binormal);
Vector3 normal = tangent.cross(binormal);
normal.ANormalize();
norm_y = normal.y;
}
// flatness=dotproduct of surface normal with up vector
float slope = 1.0f - fabs(norm_y);
if (slope < gi->minSlope - gi->minSlopeFuzzy) {
bm->at(x,y) = 0.0f;
continue;
} else if (gi->minSlopeFuzzy > 0.0f && slope < gi->minSlope + gi->minSlopeFuzzy)
factor *= (h - (gi->minSlope - gi->minSlopeFuzzy)) / ( 2.0f * gi->minSlopeFuzzy);
if (slope > gi->maxSlope + gi->maxSlopeFuzzy) {
bm->at(x,y) = 0.0f;
continue;
} else if (gi->maxSlopeFuzzy > 0.0f && slope > gi->maxSlope - gi->maxSlopeFuzzy)
factor *= ((gi->maxSlope + gi->maxSlopeFuzzy) - h) / (2.0f * gi->maxSlopeFuzzy);
factor *= gi->coverage;
factor *= (rand() < gi->noise * RAND_MAX) ? 0.0f : 1.0f;
bm->at(x,y) = factor;
}
}
BlendmapFilter(bm);
image = bm;
}
