forked from Mirrorlandia_minetest/minetest
Mgcarpathian: Mapgen loop optimisations. fabs() -> std::fabs()
* Mgcarpathian: ZYX -> ZXY mapgen loop optimisation. * 'pow(n, 3)' to 'n * n * n' type optimisations. * fabs() -> std::fabs().
This commit is contained in:
Paramat
GitHub
parent
8f827ee680
commit
2c490dddc0
@ -192,7 +192,7 @@ void MapgenCarpathianParams::writeParams(Settings *settings) const
|
||||
}
|
||||
|
||||
|
||||
///////////////////////////////////////////////////////////////////////////////
|
||||
////////////////////////////////////////////////////////////////////////////////
|
||||
|
||||
|
||||
// Lerp function
|
||||
@ -212,7 +212,7 @@ float MapgenCarpathian::getSteps(float noise)
|
||||
}
|
||||
|
||||
|
||||
///////////////////////////////////////////////////////////////////////////////
|
||||
////////////////////////////////////////////////////////////////////////////////
|
||||
|
||||
|
||||
void MapgenCarpathian::makeChunk(BlockMakeData *data)
|
||||
@ -298,7 +298,7 @@ void MapgenCarpathian::makeChunk(BlockMakeData *data)
|
||||
}
|
||||
|
||||
|
||||
///////////////////////////////////////////////////////////////////////////////
|
||||
////////////////////////////////////////////////////////////////////////////////
|
||||
|
||||
|
||||
int MapgenCarpathian::getSpawnLevelAtPoint(v2s16 p)
|
||||
@ -338,14 +338,15 @@ float MapgenCarpathian::terrainLevelAtPoint(s16 x, s16 z)
|
||||
float hill2 = getLerp(height3, height4, mnt_var);
|
||||
float hill3 = getLerp(height3, height2, mnt_var);
|
||||
float hill4 = getLerp(height1, height4, mnt_var);
|
||||
float hilliness = std::fmax(std::fmin(hill1, hill2), std::fmin(hill3, hill4));
|
||||
float hilliness =
|
||||
std::fmax(std::fmin(hill1, hill2), std::fmin(hill3, hill4));
|
||||
|
||||
// Rolling hills
|
||||
float hill_mnt = hilliness * pow(n_hills, 2.f);
|
||||
float hills = pow(hter, 3.f) * hill_mnt;
|
||||
|
||||
// Ridged mountains
|
||||
float ridge_mnt = hilliness * (1.f - fabs(n_ridge_mnt));
|
||||
float ridge_mnt = hilliness * (1.f - std::fabs(n_ridge_mnt));
|
||||
float ridged_mountains = pow(rter, 3.f) * ridge_mnt;
|
||||
|
||||
// Step (terraced) mountains
|
||||
@ -364,7 +365,7 @@ float MapgenCarpathian::terrainLevelAtPoint(s16 x, s16 z)
|
||||
}
|
||||
|
||||
|
||||
///////////////////////////////////////////////////////////////////////////////
|
||||
////////////////////////////////////////////////////////////////////////////////
|
||||
|
||||
|
||||
int MapgenCarpathian::generateTerrain()
|
||||
@ -373,10 +374,6 @@ int MapgenCarpathian::generateTerrain()
|
||||
MapNode mn_stone(c_stone);
|
||||
MapNode mn_water(c_water_source);
|
||||
|
||||
s16 stone_surface_max_y = -MAX_MAP_GENERATION_LIMIT;
|
||||
u32 index2d = 0;
|
||||
u32 index3d = 0;
|
||||
|
||||
// Calculate noise for terrain generation
|
||||
noise_base->perlinMap2D(node_min.X, node_min.Z);
|
||||
noise_height1->perlinMap2D(node_min.X, node_min.Z);
|
||||
@ -392,52 +389,66 @@ int MapgenCarpathian::generateTerrain()
|
||||
noise_mnt_var->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
|
||||
|
||||
//// Place nodes
|
||||
for (s16 z = node_min.Z; z <= node_max.Z; z++) {
|
||||
for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
|
||||
u32 vi = vm->m_area.index(node_min.X, y, z);
|
||||
for (s16 x = node_min.X; x <= node_max.X;
|
||||
x++, vi++, index2d++, index3d++) {
|
||||
if (vm->m_data[vi].getContent() != CONTENT_IGNORE)
|
||||
continue;
|
||||
const v3s16 &em = vm->m_area.getExtent();
|
||||
s16 stone_surface_max_y = -MAX_MAP_GENERATION_LIMIT;
|
||||
u32 index2d = 0;
|
||||
|
||||
for (s16 z = node_min.Z; z <= node_max.Z; z++)
|
||||
for (s16 x = node_min.X; x <= node_max.X; x++, index2d++) {
|
||||
// Base terrain
|
||||
float ground = noise_base->result[index2d];
|
||||
|
||||
// Gradient & shallow seabed
|
||||
s32 grad = (y < water_level) ? grad_wl + (water_level - y) * 3 : 1 - y;
|
||||
|
||||
// Hill/Mountain height (hilliness)
|
||||
float height1 = noise_height1->result[index2d];
|
||||
float height2 = noise_height2->result[index2d];
|
||||
float height3 = noise_height3->result[index2d];
|
||||
float height4 = noise_height4->result[index2d];
|
||||
float mnt_var = noise_mnt_var->result[index3d];
|
||||
|
||||
// Rolling hills
|
||||
float hterabs = std::fabs(noise_hills_terrain->result[index2d]);
|
||||
float n_hills = noise_hills->result[index2d];
|
||||
float hill_mnt = hterabs * hterabs * hterabs * n_hills * n_hills;
|
||||
|
||||
// Ridged mountains
|
||||
float rterabs = std::fabs(noise_ridge_terrain->result[index2d]);
|
||||
float n_ridge_mnt = noise_ridge_mnt->result[index2d];
|
||||
float ridge_mnt = rterabs * rterabs * rterabs *
|
||||
(1.f - std::fabs(n_ridge_mnt));
|
||||
|
||||
// Step (terraced) mountains
|
||||
float sterabs = std::fabs(noise_step_terrain->result[index2d]);
|
||||
float n_step_mnt = noise_step_mnt->result[index2d];
|
||||
float step_mnt = sterabs * sterabs * sterabs * getSteps(n_step_mnt);
|
||||
|
||||
// Initialise 3D noise index and voxelmanip index to column base
|
||||
u32 index3d = (z - node_min.Z) * zstride_1u1d + (x - node_min.X);
|
||||
u32 vi = vm->m_area.index(x, node_min.Y - 1, z);
|
||||
|
||||
for (s16 y = node_min.Y - 1; y <= node_max.Y + 1;
|
||||
y++,
|
||||
index3d += ystride,
|
||||
VoxelArea::add_y(em, vi, 1)) {
|
||||
if (vm->m_data[vi].getContent() != CONTENT_IGNORE)
|
||||
continue;
|
||||
|
||||
// Combine height noises and apply 3D variation
|
||||
float mnt_var = noise_mnt_var->result[index3d];
|
||||
float hill1 = getLerp(height1, height2, mnt_var);
|
||||
float hill2 = getLerp(height3, height4, mnt_var);
|
||||
float hill3 = getLerp(height3, height2, mnt_var);
|
||||
float hill4 = getLerp(height1, height4, mnt_var);
|
||||
|
||||
// 'hilliness' determines whether hills/mountains are
|
||||
// small or large
|
||||
float hilliness = std::fmax(std::fmin(hill1, hill2), std::fmin(hill3, hill4));
|
||||
float hilliness =
|
||||
std::fmax(std::fmin(hill1, hill2), std::fmin(hill3, hill4));
|
||||
float hills = hill_mnt * hilliness;
|
||||
float ridged_mountains = ridge_mnt * hilliness;
|
||||
float step_mountains = step_mnt * hilliness;
|
||||
|
||||
// Rolling hills
|
||||
float hter = noise_hills_terrain->result[index2d];
|
||||
float n_hills = noise_hills->result[index2d];
|
||||
float hill_mnt = hilliness * pow(n_hills, 2.f);
|
||||
float hills = pow(fabs(hter), 3.f) * hill_mnt;
|
||||
|
||||
// Ridged mountains
|
||||
float rter = noise_ridge_terrain->result[index2d];
|
||||
float n_ridge_mnt = noise_ridge_mnt->result[index2d];
|
||||
float ridge_mnt = hilliness * (1.f - fabs(n_ridge_mnt));
|
||||
float ridged_mountains = pow(fabs(rter), 3.f) * ridge_mnt;
|
||||
|
||||
// Step (terraced) mountains
|
||||
float ster = noise_step_terrain->result[index2d];
|
||||
float n_step_mnt = noise_step_mnt->result[index2d];
|
||||
float step_mnt = hilliness * getSteps(n_step_mnt);
|
||||
float step_mountains = pow(fabs(ster), 3.f) * step_mnt;
|
||||
// Gradient & shallow seabed
|
||||
s32 grad = (y < water_level) ? grad_wl + (water_level - y) * 3 :
|
||||
1 - y;
|
||||
|
||||
// Final terrain level
|
||||
float mountains = hills + ridged_mountains + step_mountains;
|
||||
@ -453,9 +464,6 @@ int MapgenCarpathian::generateTerrain()
|
||||
vm->m_data[vi] = mn_air; // Air
|
||||
}
|
||||
}
|
||||
index2d -= ystride;
|
||||
}
|
||||
index2d += ystride;
|
||||
}
|
||||
|
||||
return stone_surface_max_y;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user