void CGrassDrawer::DrawFarBillboards(const std::vector<GrassStruct*>& inviewFarGrass)
{
// update far grass blocks
if (updateBillboards) {
updateBillboards = false;
for_mt(0, inviewFarGrass.size(), [&](const int i){
GrassStruct& g = *inviewFarGrass[i];
if (!g.va) {
//TODO vertex arrays need to be send each frame to the gpu, that's slow. switch to VBOs.
CVertexArray* va = new CVertexArray;
g.va = va;
g.lastDist = -1; // force a recreate
}
const float distSq = GetCamDistOfGrassBlock((g.posX + 0.5f) * grassBlockSize, (g.posZ + 0.5f) * grassBlockSize, true);
if (distSq == g.lastDist)
return;
bool inAlphaRange1 = ( distSq < Square(maxDetailedDist + 128.f * 1.5f)) || ( distSq > Square(maxGrassDist - 128.f));
bool inAlphaRange2 = (g.lastDist < Square(maxDetailedDist + 128.f * 1.5f)) || (g.lastDist > Square(maxGrassDist - 128.f));
if (!inAlphaRange1 && (inAlphaRange1 == inAlphaRange2)) {
return;
}
g.lastDist = distSq;
CVertexArray* va = g.va;
va->Initialize();
for (int y2 = g.posZ * grassBlockSize; y2 < (g.posZ + 1) * grassBlockSize; ++y2) {
for (int x2 = g.posX * grassBlockSize; x2 < (g.posX + 1) * grassBlockSize; ++x2) {
if (!grassMap[y2 * mapDims.mapx / grassSquareSize + x2]) {
continue;
}
const float dist = GetCamDistOfGrassBlock(x2, y2);
auto* va_tn = va->GetTypedVertexArray<VA_TYPE_TN>(numTurfs * 4);
DrawBillboard(x2, y2, dist, va_tn);
}
}
});
}
// render far grass blocks
for (const GrassStruct* g: inviewFarGrass) {
g->va->DrawArrayTN(GL_QUADS);
}
}
void DrawQuad(int x, int y) {
const float distSq = GetCamDistOfGrassBlock((x + 0.5f) * grassBlockSize, (y + 0.5f) * grassBlockSize, true);
if (distSq > Square(gd->maxGrassDist))
return;
if (abs(x - cx) <= gd->detailedBlocks && abs(y - cy) <= gd->detailedBlocks) {
return DrawDetailQuad(x, y);
}
DrawFarQuad(x, y);
}
void CGrassBlockDrawer::DrawDetailQuad(const int x, const int y)
{
const float maxDetailedDist = gd->maxDetailedDist;
// blocks close to the camera
for (int y2 = y * grassBlockSize; y2 < (y + 1) * grassBlockSize; ++y2) {
for (int x2 = x * grassBlockSize; x2 < (x + 1) * grassBlockSize; ++x2) {
if (!gd->grassMap[y2 * gs->mapx / grassSquareSize + x2]) {
continue;
}
rng.Seed(y2 * gs->mapx / grassSquareSize + x2);
const float dist = GetCamDistOfGrassBlock(x2, y2, false);
const float rdist = 1.0f + rng.RandFloat() * 0.5f;
//TODO instead of adding grass turfs depending on their distance to the camera,
// there should be a fixed sized pool for mesh & billboard turfs
// and then we fill these pools with _preference_ for close distance turfs.
// So when a map has only less turfs, render them independent of the cam distance as mesh.
// -> see Ravaged_2
if (dist < (maxDetailedDist + 128.f * rdist)) {
// close grass (render as mesh)
CGrassDrawer::InviewNearGrass iv;
iv.dist = dist;
iv.x = x2;
iv.y = y2;
inviewGrass.push_back(iv);
}
if (dist > maxDetailedDist) {
// near but not close, save for later drawing
CGrassDrawer::InviewNearGrass iv;
iv.dist = dist;
iv.x = x2;
iv.y = y2;
inviewNearGrass.push_back(iv);
}
}
}
}
static const bool GrassSort(const CGrassDrawer::GrassStruct* a, const CGrassDrawer::GrassStruct* b) {
const float distA = GetCamDistOfGrassBlock((a->posX + 0.5f) * grassBlockSize, (a->posZ + 0.5f) * grassBlockSize, true);
const float distB = GetCamDistOfGrassBlock((b->posX + 0.5f) * grassBlockSize, (b->posZ + 0.5f) * grassBlockSize, true);
return (distA > distB);
}
