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().
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Paramat
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@ -192,7 +192,7 @@ void MapgenCarpathianParams::writeParams(Settings *settings) const
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}
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///////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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// Lerp function
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@ -212,7 +212,7 @@ float MapgenCarpathian::getSteps(float noise)
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}
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///////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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void MapgenCarpathian::makeChunk(BlockMakeData *data)
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@ -298,7 +298,7 @@ void MapgenCarpathian::makeChunk(BlockMakeData *data)
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}
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///////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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int MapgenCarpathian::getSpawnLevelAtPoint(v2s16 p)
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@ -338,14 +338,15 @@ float MapgenCarpathian::terrainLevelAtPoint(s16 x, s16 z)
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float hill2 = getLerp(height3, height4, mnt_var);
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float hill3 = getLerp(height3, height2, mnt_var);
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float hill4 = getLerp(height1, height4, mnt_var);
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float hilliness = std::fmax(std::fmin(hill1, hill2), std::fmin(hill3, hill4));
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float hilliness =
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std::fmax(std::fmin(hill1, hill2), std::fmin(hill3, hill4));
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// Rolling hills
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float hill_mnt = hilliness * pow(n_hills, 2.f);
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float hills = pow(hter, 3.f) * hill_mnt;
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// Ridged mountains
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float ridge_mnt = hilliness * (1.f - fabs(n_ridge_mnt));
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float ridge_mnt = hilliness * (1.f - std::fabs(n_ridge_mnt));
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float ridged_mountains = pow(rter, 3.f) * ridge_mnt;
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// Step (terraced) mountains
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@ -364,7 +365,7 @@ float MapgenCarpathian::terrainLevelAtPoint(s16 x, s16 z)
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}
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///////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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int MapgenCarpathian::generateTerrain()
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@ -373,10 +374,6 @@ int MapgenCarpathian::generateTerrain()
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MapNode mn_stone(c_stone);
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MapNode mn_water(c_water_source);
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s16 stone_surface_max_y = -MAX_MAP_GENERATION_LIMIT;
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u32 index2d = 0;
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u32 index3d = 0;
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// Calculate noise for terrain generation
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noise_base->perlinMap2D(node_min.X, node_min.Z);
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noise_height1->perlinMap2D(node_min.X, node_min.Z);
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@ -392,70 +389,81 @@ int MapgenCarpathian::generateTerrain()
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noise_mnt_var->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
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//// Place nodes
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for (s16 z = node_min.Z; z <= node_max.Z; z++) {
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for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
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u32 vi = vm->m_area.index(node_min.X, y, z);
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for (s16 x = node_min.X; x <= node_max.X;
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x++, vi++, index2d++, index3d++) {
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if (vm->m_data[vi].getContent() != CONTENT_IGNORE)
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continue;
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const v3s16 &em = vm->m_area.getExtent();
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s16 stone_surface_max_y = -MAX_MAP_GENERATION_LIMIT;
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u32 index2d = 0;
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// Base terrain
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float ground = noise_base->result[index2d];
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for (s16 z = node_min.Z; z <= node_max.Z; z++)
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for (s16 x = node_min.X; x <= node_max.X; x++, index2d++) {
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// Base terrain
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float ground = noise_base->result[index2d];
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// Gradient & shallow seabed
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s32 grad = (y < water_level) ? grad_wl + (water_level - y) * 3 : 1 - y;
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// Hill/Mountain height (hilliness)
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float height1 = noise_height1->result[index2d];
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float height2 = noise_height2->result[index2d];
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float height3 = noise_height3->result[index2d];
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float height4 = noise_height4->result[index2d];
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// Hill/Mountain height (hilliness)
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float height1 = noise_height1->result[index2d];
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float height2 = noise_height2->result[index2d];
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float height3 = noise_height3->result[index2d];
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float height4 = noise_height4->result[index2d];
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float mnt_var = noise_mnt_var->result[index3d];
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// Combine height noises and apply 3D variation
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float hill1 = getLerp(height1, height2, mnt_var);
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float hill2 = getLerp(height3, height4, mnt_var);
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float hill3 = getLerp(height3, height2, mnt_var);
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float hill4 = getLerp(height1, height4, mnt_var);
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// 'hilliness' determines whether hills/mountains are
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// small or large
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float hilliness = std::fmax(std::fmin(hill1, hill2), std::fmin(hill3, hill4));
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// Rolling hills
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float hterabs = std::fabs(noise_hills_terrain->result[index2d]);
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float n_hills = noise_hills->result[index2d];
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float hill_mnt = hterabs * hterabs * hterabs * n_hills * n_hills;
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// Rolling hills
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float hter = noise_hills_terrain->result[index2d];
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float n_hills = noise_hills->result[index2d];
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float hill_mnt = hilliness * pow(n_hills, 2.f);
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float hills = pow(fabs(hter), 3.f) * hill_mnt;
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// Ridged mountains
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float rterabs = std::fabs(noise_ridge_terrain->result[index2d]);
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float n_ridge_mnt = noise_ridge_mnt->result[index2d];
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float ridge_mnt = rterabs * rterabs * rterabs *
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(1.f - std::fabs(n_ridge_mnt));
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// Ridged mountains
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float rter = noise_ridge_terrain->result[index2d];
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float n_ridge_mnt = noise_ridge_mnt->result[index2d];
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float ridge_mnt = hilliness * (1.f - fabs(n_ridge_mnt));
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float ridged_mountains = pow(fabs(rter), 3.f) * ridge_mnt;
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// Step (terraced) mountains
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float sterabs = std::fabs(noise_step_terrain->result[index2d]);
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float n_step_mnt = noise_step_mnt->result[index2d];
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float step_mnt = sterabs * sterabs * sterabs * getSteps(n_step_mnt);
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// Step (terraced) mountains
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float ster = noise_step_terrain->result[index2d];
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float n_step_mnt = noise_step_mnt->result[index2d];
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float step_mnt = hilliness * getSteps(n_step_mnt);
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float step_mountains = pow(fabs(ster), 3.f) * step_mnt;
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// Initialise 3D noise index and voxelmanip index to column base
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u32 index3d = (z - node_min.Z) * zstride_1u1d + (x - node_min.X);
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u32 vi = vm->m_area.index(x, node_min.Y - 1, z);
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// Final terrain level
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float mountains = hills + ridged_mountains + step_mountains;
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float surface_level = ground + mountains + grad;
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for (s16 y = node_min.Y - 1; y <= node_max.Y + 1;
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y++,
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index3d += ystride,
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VoxelArea::add_y(em, vi, 1)) {
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if (vm->m_data[vi].getContent() != CONTENT_IGNORE)
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continue;
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if (y < surface_level) {
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vm->m_data[vi] = mn_stone; // Stone
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if (y > stone_surface_max_y)
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stone_surface_max_y = y;
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} else if (y <= water_level) {
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vm->m_data[vi] = mn_water; // Sea water
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} else {
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vm->m_data[vi] = mn_air; // Air
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}
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// Combine height noises and apply 3D variation
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float mnt_var = noise_mnt_var->result[index3d];
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float hill1 = getLerp(height1, height2, mnt_var);
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float hill2 = getLerp(height3, height4, mnt_var);
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float hill3 = getLerp(height3, height2, mnt_var);
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float hill4 = getLerp(height1, height4, mnt_var);
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// 'hilliness' determines whether hills/mountains are
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// small or large
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float hilliness =
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std::fmax(std::fmin(hill1, hill2), std::fmin(hill3, hill4));
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float hills = hill_mnt * hilliness;
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float ridged_mountains = ridge_mnt * hilliness;
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float step_mountains = step_mnt * hilliness;
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// Gradient & shallow seabed
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s32 grad = (y < water_level) ? grad_wl + (water_level - y) * 3 :
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1 - y;
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// Final terrain level
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float mountains = hills + ridged_mountains + step_mountains;
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float surface_level = ground + mountains + grad;
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if (y < surface_level) {
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vm->m_data[vi] = mn_stone; // Stone
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if (y > stone_surface_max_y)
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stone_surface_max_y = y;
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} else if (y <= water_level) {
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vm->m_data[vi] = mn_water; // Sea water
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} else {
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vm->m_data[vi] = mn_air; // Air
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}
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index2d -= ystride;
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}
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index2d += ystride;
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}
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return stone_surface_max_y;
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