GLuint GenSphereBumpmap()
{
GLuint id;
glGenTextures(1, &id);
glBindTexture(GL_TEXTURE_2D, id);
uchar img[3 * 64 * 64], *p = img;
for (int y = 0; y < 64; y++) {
for (int x = 0; x < 64; x++)
{
int sx = x - 32;
int sy = y - 32;
Vector3 n;
if (sx*sx + sy*sy < 32*32) {
const int sz = (int)sqrt(static_cast<float>(32 * 32 - sx*sx - sy*sy));
n = Vector3(sx, sy, sz);
n.ANormalize();
}
// compress it into a color
*(p++) = (uchar)(255 * (n.x * 0.5f + 0.5f));
*(p++) = (uchar)(255 * (n.y * 0.5f + 0.5f));
*(p++) = (uchar)(255 * (n.z * 0.5f + 0.5f));
}
}
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, 3, 64, 64, 0, GL_RGB, GL_UNSIGNED_BYTE, img);
SaveImage("sphere_bm.jpg", 3, GL_UNSIGNED_BYTE, 64, 64, img);
return id;
}
void RenderDataManager::InitializeNode(TQuad* q)
{
assert(!q->renderData);
QuadRenderData* rd = q->renderData = Allocate();
// Allocate vertex data space
const size_t vertexSize = q->GetVertexSize();
if (static_cast<int>(vertexSize) != rd->vertexSize) {
const size_t size = NUM_VERTICES * vertexSize;
if (rd->vertexBuffer.GetSize() != size) {
rd->vertexBuffer.Init(size);
}
rd->vertexSize = vertexSize;
}
// build the vertex buffer
Vector3* v = (Vector3*)rd->vertexBuffer.LockData();
uint vda = q->textureSetup->vertexDataReq; // vertex data requirements
const Heightmap* hm = roothm->GetLevel(q->depth); // get the right heightmap level
for (int y = q->hmPos.y; y <= (q->hmPos.y + QUAD_W); y++)
for (int x = q->hmPos.x; x <= (q->hmPos.x + QUAD_W); x++)
{
*(v++) = Vector3(x * hm->squareSize, hm->atSynced(x, y), y * hm->squareSize);
Vector3 tangent, binormal;
CalculateTangents(hm, x,y, tangent, binormal);
Vector3 normal = binormal.cross(tangent);
normal.ANormalize();
if (vda & VRT_Normal)
*(v++) = normal;
if (vda & VRT_TangentSpaceMatrix)
{
tangent.ANormalize();
binormal.ANormalize();
// orthonormal matrix, so inverse=transpose
// Take the inverse of the tangent space -> world space transformation
Vector3* tgs2ws = v;
tgs2ws[0] = Vector3(tangent.x, binormal.x, normal.x);
tgs2ws[1] = Vector3(tangent.y, binormal.y, normal.y);
tgs2ws[2] = Vector3(tangent.z, binormal.z, normal.z);
v += 3;
}
}
rd->vertexBuffer.UnlockData();
rd->SetQuad(q);
}
void Heightmap::GenerateNormals()
{
normalData = new uchar[3 * w * h];
uchar* cnorm = normalData;
for (int y = 0; y < h;y++)
for (int x = 0; x < w; x++) {
Vector3 tangent, binormal;
CalculateTangents(this, x, y, tangent, binormal);
Vector3 normal = binormal.cross(tangent);
normal.ANormalize();
*(cnorm++) = (uchar)((normal.x * 0.5f + 0.5f) * 255);
*(cnorm++) = (uchar)((normal.y * 0.5f + 0.5f) * 255);
*(cnorm++) = (uchar)((normal.z * 0.5f + 0.5f) * 255);
}
}
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;
}
Lightmap::Lightmap(Heightmap* orghm, int level, int shadowLevelDif, LightingInfo* li)
{
const spring_time startTicks = spring_gettime();
tilesize.x = orghm->w-1;
tilesize.y = orghm->h-1;
name = "lightmap";
const Heightmap* hm = NULL;
int w;
for(;;) {
hm = orghm->GetLevel(-level);
w = hm->w - 1;
GLint maxw;
glGetIntegerv(GL_MAX_TEXTURE_SIZE, &maxw);
if (w > maxw) level++;
else break;
}
shadowLevelDif = 0;
const Heightmap* shadowhm = orghm->GetLevel(-(level + shadowLevelDif));
int shadowScale= 1 << shadowLevelDif;
int shadowW = shadowhm->w - 1;
assert(w/shadowW == shadowScale);
//float org2c = w/float(orghm->w-1);
//float c2org = (float)(orghm->w-1)/w;
float* centerhm = new float[w*w];
Vector3* shading = new Vector3[w*w];
for (int y=0;y<w;y++)
for (int x=0;x<w;x++) {
centerhm[y*w+x] =/* hm->scale * */ 0.25f * ( (int)hm->atSynced(x, y)+ (int)hm->atSynced(x + 1, y) + (int)hm->atSynced(x, y + 1) + (int)hm->atSynced(x + 1, y + 1) ); //+ hm->offset;
shading[y*w + x] = li->ambient;
}
uchar* lightMap = new uchar[shadowW * shadowW];
for (std::vector<StaticLight>::const_iterator l = li->staticLights.begin(); l != li->staticLights.end(); ++l)
{
float lightx;
float lighty;
if (l->directional) {
lightx = l->position.x;
lighty = l->position.y;
} else {
lightx = (int)(l->position.x / shadowhm->squareSize);
lighty = (int)(l->position.z / shadowhm->squareSize);
}
CalculateShadows(lightMap, shadowW, lightx, lighty,
l->position.y, centerhm, w, shadowScale, l->directional);
for (int y = 0; y < w; y++)
{
for (int x = 0; x < w; x++)
{
if (!lightMap[(y*shadowW + x) / shadowScale])
continue;
Vector3 wp;
if (l->directional)
wp = l->position;
else
wp = l->position - Vector3((x + 0.5f) * hm->squareSize,centerhm[y*w + x], (y + 0.5f) * hm->squareSize);
const uchar* normal = hm->GetNormal(x, y);
Vector3 normv((2 * (int)normal[0] - 256)/255.0f, (2 * (int)normal[1] - 256)/255.0f, (2 * (int)normal[2] - 256)/255.0f);
wp.ANormalize();
float dot = wp.dot(normv);
if(dot < 0.0f) dot = 0.0f;
if(dot > 1.0f) dot = 1.0f;
dot *= lightMap[(y*shadowW + x) / shadowScale] * (1.0f / 255.0f);
shading[y*w + x] += l->color * dot;
}
}
}
delete[] lightMap;
glGenTextures(1, &shadingTex);
glBindTexture (GL_TEXTURE_2D, shadingTex);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
uchar* shadingTexData = new uchar[w*w*4];
for (int y = 0; y < w; y++) {
for (int x = 0; x < w; x++) {
shadingTexData[(y*w + x) * 4 + 0] = (uchar)(min(1.0f, shading[y*w + x].x) * 255);
shadingTexData[(y*w + x) * 4 + 1] = (uchar)(min(1.0f, shading[y*w + x].y) * 255);
shadingTexData[(y*w + x) * 4 + 2] = (uchar)(min(1.0f, shading[y*w + x].z) * 255);
shadingTexData[(y*w + x) * 4 + 3] = CReadMap::EncodeHeight(centerhm[w*y + x]);
}
}
SaveImage ("lightmap.png", 4, IL_UNSIGNED_BYTE, w, w, shadingTexData);
glBuildMipmaps(GL_TEXTURE_2D, 4, w, w, GL_RGBA, GL_UNSIGNED_BYTE, shadingTexData);
delete[] shadingTexData;
id = shadingTex;
delete[] shading;
delete[] centerhm;
const spring_duration numTicks = spring_gettime() - startTicks;
LOG("Lightmap generation: %2.3f seconds", spring_tomsecs(numTicks) * 0.001f);
}