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Mgv7: Add optional floatlands, disabled by default
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@paramat
paramat committed Nov 15, 2016
1 parent 5fd1ef9 commit bc3980e
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Showing 4 changed files with 221 additions and 68 deletions.
24 changes: 20 additions & 4 deletions builtin/settingtypes.txt
View file
Expand Up @@ -963,23 +963,39 @@ mgv6_np_apple_trees (Mapgen v6 apple trees noise parameters) noise_params 0, 1,
[***Mapgen v7]

# Map generation attributes specific to Mapgen v7.
# The 'ridges' flag controls the rivers.
# The 'ridges' flag enables the rivers.
# Floatlands are currently experimental and subject to change.
# Flags that are not specified in the flag string are not modified from the default.
# Flags starting with 'no' are used to explicitly disable them.
mgv7_spflags (Mapgen v7 flags) flags mountains,ridges mountains,ridges,nomountains,noridges
mgv7_spflags (Mapgen v7 flags) flags mountains,ridges mountains,ridges,floatlands,nomountains,noridges,nofloatlands

# Controls width of tunnels, a smaller value creates wider tunnels.
mgv7_cave_width (Mapgen v7 cave width) float 0.2

# Controls the density of floatland mountain terrain.
# Is an offset added to the 'np_mountain' noise value.
mgv7_float_mount_density (Mapgen v7 floatland mountain density) float 0.6

# Typical maximum height, above and below midpoint, of floatland mountain terrain.
mgv7_float_mount_height (Mapgen v7 floatland mountain height) float 128.0

# Y-level of floatland midpoint and lake surface.
mgv7_floatland_level (Mapgen v7 floatland level) int 1280

# Y-level to which floatland shadows extend.
mgv7_shadow_limit (Mapgen v7 shadow limit) int 1024

mgv7_np_terrain_base (Mapgen v7 terrain base noise parameters) noise_params 4, 70, (600, 600, 600), 82341, 5, 0.6, 2.0
mgv7_np_terrain_alt (Mapgen v7 terrain altitude noise parameters) noise_params 4, 25, (600, 600, 600), 5934, 5, 0.6, 2.0
mgv7_np_terrain_persist (Mapgen v7 terrain persistation noise parameters) noise_params 0.6, 0.1, (2000, 2000, 2000), 539, 3, 0.6, 2.0
mgv7_np_height_select (Mapgen v7 height select noise parameters) noise_params -8, 16, (500, 500, 500), 4213, 6, 0.7, 2.0
mgv7_np_filler_depth (Mapgen v7 filler depth noise parameters) noise_params 0, 1.2, (150, 150, 150), 261, 3, 0.7, 2.0
mgv7_np_mount_height (Mapgen v7 mount height noise parameters) noise_params 256, 112, (1000, 1000, 1000), 72449, 3, 0.6, 2.0
mgv7_np_ridge_uwater (Mapgen v7 ridge water noise parameters) noise_params 0, 1, (1000, 1000, 1000), 85039, 5, 0.6, 2.0
mgv7_np_ridge_uwater (Mapgen v7 river course noise parameters) noise_params 0, 1, (1000, 1000, 1000), 85039, 5, 0.6, 2.0
mgv7_np_floatland_base (Mapgen v7 floatland base terrain noise parameters) noise_params -0.6, 1.5, (600, 600, 600), 114, 5, 0.6, 2.0
mgv7_np_float_base_height (Mapgen v7 floatland base terrain height noise parameters) noise_params 48, 24, (300, 300, 300), 907, 4, 0.7, 2.0
mgv7_np_mountain (Mapgen v7 mountain noise parameters) noise_params -0.6, 1, (250, 350, 250), 5333, 5, 0.63, 2.0
mgv7_np_ridge (Mapgen v7 ridge noise parameters) noise_params 0, 1, (100, 100, 100), 6467, 4, 0.75, 2.0
mgv7_np_ridge (Mapgen v7 river channel wall noise parameters) noise_params 0, 1, (100, 100, 100), 6467, 4, 0.75, 2.0
mgv7_np_cave1 (Mapgen v7 cave1 noise parameters) noise_params 0, 12, (61, 61, 61), 52534, 3, 0.5, 2.0
mgv7_np_cave2 (Mapgen v7 cave2 noise parameters) noise_params 0, 12, (67, 67, 67), 10325, 3, 0.5, 2.0

Expand Down
29 changes: 27 additions & 2 deletions minetest.conf.example
View file
Expand Up @@ -1239,16 +1239,35 @@
#### Mapgen v7

# Map generation attributes specific to Mapgen v7.
# The 'ridges' flag controls the rivers.
# The 'ridges' flag enables the rivers.
# Floatlands are currently experimental and subject to change.
# Flags that are not specified in the flag string are not modified from the default.
# Flags starting with 'no' are used to explicitly disable them.
# type: flags possible values: mountains, ridges, nomountains, noridges
# type: flags possible values: mountains, ridges, floatlands,
# nomountains, noridges, nofloatlands
# mgv7_spflags = mountains,ridges

# Controls width of tunnels, a smaller value creates wider tunnels.
# type: float
# mgv7_cave_width = 0.2

# Controls the density of floatland mountain terrain.
# Is an offset added to the 'np_mountain' noise value.
# type: float
# mgv7_float_mount_density = 0.6

# Typical maximum height, above and below midpoint, of floatland mountain terrain.
# type: float
# mgv7_float_mount_height = 128.0

# Y-level of floatland midpoint and lake surface.
# type: int
# mgv7_floatland_level = 1280

# Y-level to which floatland shadows extend.
# type: int
# mgv7_shadow_limit = 1024

# type: noise_params
# mgv7_np_terrain_base = 4, 70, (600, 600, 600), 82341, 5, 0.6, 2.0

Expand All @@ -1270,6 +1289,12 @@
# type: noise_params
# mgv7_np_ridge_uwater = 0, 1, (1000, 1000, 1000), 85039, 5, 0.6, 2.0

# type: noise_params
# mgv7_np_floatland_base = -0.6, 1.5, (600, 600, 600), 114, 5, 0.6, 2.0

# type: noise_params
# mgv7_np_float_base_height = 48, 24, (300, 300, 300), 907, 4, 0.7, 2.0

# type: noise_params
# mgv7_np_mountain = -0.6, 1, (250, 350, 250), 5333, 5, 0.63, 2.0

Expand Down
212 changes: 153 additions & 59 deletions src/mapgen_v7.cpp
View file
Expand Up @@ -41,9 +41,10 @@ with this program; if not, write to the Free Software Foundation, Inc.,


FlagDesc flagdesc_mapgen_v7[] = {
{"mountains", MGV7_MOUNTAINS},
{"ridges", MGV7_RIDGES},
{NULL, 0}
{"mountains", MGV7_MOUNTAINS},
{"ridges", MGV7_RIDGES},
{"floatlands", MGV7_FLOATLANDS},
{NULL, 0}
};


Expand All @@ -53,17 +54,23 @@ FlagDesc flagdesc_mapgen_v7[] = {
MapgenV7::MapgenV7(int mapgenid, MapgenV7Params *params, EmergeManager *emerge)
: MapgenBasic(mapgenid, params, emerge)
{
this->spflags = params->spflags;
this->cave_width = params->cave_width;
this->spflags = params->spflags;
this->cave_width = params->cave_width;
this->float_mount_density = params->float_mount_density;
this->float_mount_height = params->float_mount_height;
this->floatland_level = params->floatland_level;
this->shadow_limit = params->shadow_limit;

//// Terrain noise
noise_terrain_base = new Noise(&params->np_terrain_base, seed, csize.X, csize.Z);
noise_terrain_alt = new Noise(&params->np_terrain_alt, seed, csize.X, csize.Z);
noise_terrain_persist = new Noise(&params->np_terrain_persist, seed, csize.X, csize.Z);
noise_height_select = new Noise(&params->np_height_select, seed, csize.X, csize.Z);
noise_filler_depth = new Noise(&params->np_filler_depth, seed, csize.X, csize.Z);
noise_mount_height = new Noise(&params->np_mount_height, seed, csize.X, csize.Z);
noise_ridge_uwater = new Noise(&params->np_ridge_uwater, seed, csize.X, csize.Z);
noise_terrain_base = new Noise(&params->np_terrain_base, seed, csize.X, csize.Z);
noise_terrain_alt = new Noise(&params->np_terrain_alt, seed, csize.X, csize.Z);
noise_terrain_persist = new Noise(&params->np_terrain_persist, seed, csize.X, csize.Z);
noise_height_select = new Noise(&params->np_height_select, seed, csize.X, csize.Z);
noise_filler_depth = new Noise(&params->np_filler_depth, seed, csize.X, csize.Z);
noise_mount_height = new Noise(&params->np_mount_height, seed, csize.X, csize.Z);
noise_ridge_uwater = new Noise(&params->np_ridge_uwater, seed, csize.X, csize.Z);
noise_floatland_base = new Noise(&params->np_floatland_base, seed, csize.X, csize.Z);
noise_float_base_height = new Noise(&params->np_float_base_height, seed, csize.X, csize.Z);

//// 3d terrain noise
// 1-up 1-down overgeneration
Expand All @@ -84,65 +91,85 @@ MapgenV7::~MapgenV7()
delete noise_filler_depth;
delete noise_mount_height;
delete noise_ridge_uwater;
delete noise_floatland_base;
delete noise_float_base_height;
delete noise_mountain;
delete noise_ridge;
}


MapgenV7Params::MapgenV7Params()
{
spflags = MGV7_MOUNTAINS | MGV7_RIDGES;
cave_width = 0.2;

np_terrain_base = NoiseParams(4, 70, v3f(600, 600, 600), 82341, 5, 0.6, 2.0);
np_terrain_alt = NoiseParams(4, 25, v3f(600, 600, 600), 5934, 5, 0.6, 2.0);
np_terrain_persist = NoiseParams(0.6, 0.1, v3f(2000, 2000, 2000), 539, 3, 0.6, 2.0);
np_height_select = NoiseParams(-8, 16, v3f(500, 500, 500), 4213, 6, 0.7, 2.0);
np_filler_depth = NoiseParams(0, 1.2, v3f(150, 150, 150), 261, 3, 0.7, 2.0);
np_mount_height = NoiseParams(256, 112, v3f(1000, 1000, 1000), 72449, 3, 0.6, 2.0);
np_ridge_uwater = NoiseParams(0, 1, v3f(1000, 1000, 1000), 85039, 5, 0.6, 2.0);
np_mountain = NoiseParams(-0.6, 1, v3f(250, 350, 250), 5333, 5, 0.63, 2.0);
np_ridge = NoiseParams(0, 1, v3f(100, 100, 100), 6467, 4, 0.75, 2.0);
np_cave1 = NoiseParams(0, 12, v3f(61, 61, 61), 52534, 3, 0.5, 2.0);
np_cave2 = NoiseParams(0, 12, v3f(67, 67, 67), 10325, 3, 0.5, 2.0);
spflags = MGV7_MOUNTAINS | MGV7_RIDGES;
cave_width = 0.2;
float_mount_density = 0.6;
float_mount_height = 128.0;
floatland_level = 1280;
shadow_limit = 1024;

np_terrain_base = NoiseParams(4, 70, v3f(600, 600, 600), 82341, 5, 0.6, 2.0);
np_terrain_alt = NoiseParams(4, 25, v3f(600, 600, 600), 5934, 5, 0.6, 2.0);
np_terrain_persist = NoiseParams(0.6, 0.1, v3f(2000, 2000, 2000), 539, 3, 0.6, 2.0);
np_height_select = NoiseParams(-8, 16, v3f(500, 500, 500), 4213, 6, 0.7, 2.0);
np_filler_depth = NoiseParams(0, 1.2, v3f(150, 150, 150), 261, 3, 0.7, 2.0);
np_mount_height = NoiseParams(256, 112, v3f(1000, 1000, 1000), 72449, 3, 0.6, 2.0);
np_ridge_uwater = NoiseParams(0, 1, v3f(1000, 1000, 1000), 85039, 5, 0.6, 2.0);
np_floatland_base = NoiseParams(-0.6, 1.5, v3f(600, 600, 600), 114, 5, 0.6, 2.0);
np_float_base_height = NoiseParams(48, 24, v3f(300, 300, 300), 907, 4, 0.7, 2.0);
np_mountain = NoiseParams(-0.6, 1, v3f(250, 350, 250), 5333, 5, 0.63, 2.0);
np_ridge = NoiseParams(0, 1, v3f(100, 100, 100), 6467, 4, 0.75, 2.0);
np_cave1 = NoiseParams(0, 12, v3f(61, 61, 61), 52534, 3, 0.5, 2.0);
np_cave2 = NoiseParams(0, 12, v3f(67, 67, 67), 10325, 3, 0.5, 2.0);
}


void MapgenV7Params::readParams(const Settings *settings)
{
settings->getFlagStrNoEx("mgv7_spflags", spflags, flagdesc_mapgen_v7);
settings->getFloatNoEx("mgv7_cave_width", cave_width);

settings->getNoiseParams("mgv7_np_terrain_base", np_terrain_base);
settings->getNoiseParams("mgv7_np_terrain_alt", np_terrain_alt);
settings->getNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
settings->getNoiseParams("mgv7_np_height_select", np_height_select);
settings->getNoiseParams("mgv7_np_filler_depth", np_filler_depth);
settings->getNoiseParams("mgv7_np_mount_height", np_mount_height);
settings->getNoiseParams("mgv7_np_ridge_uwater", np_ridge_uwater);
settings->getNoiseParams("mgv7_np_mountain", np_mountain);
settings->getNoiseParams("mgv7_np_ridge", np_ridge);
settings->getNoiseParams("mgv7_np_cave1", np_cave1);
settings->getNoiseParams("mgv7_np_cave2", np_cave2);
settings->getFlagStrNoEx("mgv7_spflags", spflags, flagdesc_mapgen_v7);
settings->getFloatNoEx("mgv7_cave_width", cave_width);
settings->getFloatNoEx("mgv7_float_mount_density", float_mount_density);
settings->getFloatNoEx("mgv7_float_mount_height", float_mount_height);
settings->getS16NoEx("mgv7_floatland_level", floatland_level);
settings->getS16NoEx("mgv7_shadow_limit", shadow_limit);

settings->getNoiseParams("mgv7_np_terrain_base", np_terrain_base);
settings->getNoiseParams("mgv7_np_terrain_alt", np_terrain_alt);
settings->getNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
settings->getNoiseParams("mgv7_np_height_select", np_height_select);
settings->getNoiseParams("mgv7_np_filler_depth", np_filler_depth);
settings->getNoiseParams("mgv7_np_mount_height", np_mount_height);
settings->getNoiseParams("mgv7_np_ridge_uwater", np_ridge_uwater);
settings->getNoiseParams("mgv7_np_floatland_base", np_floatland_base);
settings->getNoiseParams("mgv7_np_float_base_height", np_float_base_height);
settings->getNoiseParams("mgv7_np_mountain", np_mountain);
settings->getNoiseParams("mgv7_np_ridge", np_ridge);
settings->getNoiseParams("mgv7_np_cave1", np_cave1);
settings->getNoiseParams("mgv7_np_cave2", np_cave2);
}


void MapgenV7Params::writeParams(Settings *settings) const
{
settings->setFlagStr("mgv7_spflags", spflags, flagdesc_mapgen_v7, U32_MAX);
settings->setFloat("mgv7_cave_width", cave_width);

settings->setNoiseParams("mgv7_np_terrain_base", np_terrain_base);
settings->setNoiseParams("mgv7_np_terrain_alt", np_terrain_alt);
settings->setNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
settings->setNoiseParams("mgv7_np_height_select", np_height_select);
settings->setNoiseParams("mgv7_np_filler_depth", np_filler_depth);
settings->setNoiseParams("mgv7_np_mount_height", np_mount_height);
settings->setNoiseParams("mgv7_np_ridge_uwater", np_ridge_uwater);
settings->setNoiseParams("mgv7_np_mountain", np_mountain);
settings->setNoiseParams("mgv7_np_ridge", np_ridge);
settings->setNoiseParams("mgv7_np_cave1", np_cave1);
settings->setNoiseParams("mgv7_np_cave2", np_cave2);
settings->setFlagStr("mgv7_spflags", spflags, flagdesc_mapgen_v7, U32_MAX);
settings->setFloat("mgv7_cave_width", cave_width);
settings->setFloat("mgv7_float_mount_density", float_mount_density);
settings->setFloat("mgv7_float_mount_height", float_mount_height);
settings->setS16("mgv7_floatland_level", floatland_level);
settings->setS16("mgv7_shadow_limit", shadow_limit);

settings->setNoiseParams("mgv7_np_terrain_base", np_terrain_base);
settings->setNoiseParams("mgv7_np_terrain_alt", np_terrain_alt);
settings->setNoiseParams("mgv7_np_terrain_persist", np_terrain_persist);
settings->setNoiseParams("mgv7_np_height_select", np_height_select);
settings->setNoiseParams("mgv7_np_filler_depth", np_filler_depth);
settings->setNoiseParams("mgv7_np_mount_height", np_mount_height);
settings->setNoiseParams("mgv7_np_ridge_uwater", np_ridge_uwater);
settings->setNoiseParams("mgv7_np_floatland_base", np_floatland_base);
settings->setNoiseParams("mgv7_np_float_base_height", np_float_base_height);
settings->setNoiseParams("mgv7_np_mountain", np_mountain);
settings->setNoiseParams("mgv7_np_ridge", np_ridge);
settings->setNoiseParams("mgv7_np_cave1", np_cave1);
settings->setNoiseParams("mgv7_np_cave2", np_cave2);
}


Expand Down Expand Up @@ -249,9 +276,13 @@ void MapgenV7::makeChunk(BlockMakeData *data)

updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);

// Limit floatland shadow
bool propagate_shadow = !((spflags & MGV7_FLOATLANDS) &&
node_min.Y <= shadow_limit && node_max.Y >= shadow_limit);

if (flags & MG_LIGHT)
calcLighting(node_min - v3s16(0, 1, 0), node_max + v3s16(0, 1, 0),
full_node_min, full_node_max);
full_node_min, full_node_max, propagate_shadow);

//setLighting(node_min - v3s16(1, 0, 1) * MAP_BLOCKSIZE,
// node_max + v3s16(1, 0, 1) * MAP_BLOCKSIZE, 0xFF);
Expand Down Expand Up @@ -313,6 +344,47 @@ bool MapgenV7::getMountainTerrainFromMap(int idx_xyz, int idx_xz, s16 y)
}


bool MapgenV7::getFloatlandMountainFromMap(int idx_xyz, int idx_xz, s16 y)
{
float density_gradient =
-pow(fabs((float)(y - floatland_level) / float_mount_height), 0.8f);
float floatn = noise_mountain->result[idx_xyz] + float_mount_density;

return floatn + density_gradient >= 0.0f;
}


void MapgenV7::floatBaseExtentFromMap(s16 *float_base_min, s16 *float_base_max, int idx_xz)
{
// '+1' to avoid a layer of stone at y = MAX_MAP_GENERATION_LIMIT
s16 base_min = MAX_MAP_GENERATION_LIMIT + 1;
s16 base_max = MAX_MAP_GENERATION_LIMIT;

float n_base = noise_floatland_base->result[idx_xz];
if (n_base > 0.0f) {
float n_base_height =
MYMAX(noise_float_base_height->result[idx_xz], 0.0f);
float amp = n_base * n_base_height;
float ridge = n_base_height / 3.0f;
base_min = floatland_level - amp / 2.0f;

if (amp > ridge * 2.0f) {
// Lake bed
base_max = floatland_level - (amp - ridge * 2.0f) / 2.0f;
} else {
// Hills and ridges
float diff = fabs(amp - ridge) / ridge;
// Smooth ridges using the 'smoothstep function'
float smooth_diff = diff * diff * (3.0f - 2.0f * diff);
base_max = floatland_level + ridge - smooth_diff * ridge;
}
}

*float_base_min = base_min;
*float_base_max = base_max;
}


int MapgenV7::generateTerrain()
{
MapNode n_air(CONTENT_AIR);
Expand All @@ -327,11 +399,19 @@ int MapgenV7::generateTerrain()
noise_terrain_alt->perlinMap2D(node_min.X, node_min.Z, persistmap);
noise_height_select->perlinMap2D(node_min.X, node_min.Z);

if (spflags & MGV7_MOUNTAINS) {
if ((spflags & MGV7_MOUNTAINS) || (spflags & MGV7_FLOATLANDS)) {
noise_mountain->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
}

if (spflags & MGV7_MOUNTAINS) {
noise_mount_height->perlinMap2D(node_min.X, node_min.Z);
}

if (spflags & MGV7_FLOATLANDS) {
noise_floatland_base->perlinMap2D(node_min.X, node_min.Z);
noise_float_base_height->perlinMap2D(node_min.X, node_min.Z);
}

//// Place nodes
v3s16 em = vm->m_area.getExtent();
s16 stone_surface_max_y = -MAX_MAP_GENERATION_LIMIT;
Expand All @@ -340,10 +420,16 @@ int MapgenV7::generateTerrain()
for (s16 z = node_min.Z; z <= node_max.Z; z++)
for (s16 x = node_min.X; x <= node_max.X; x++, index2d++) {
s16 surface_y = baseTerrainLevelFromMap(index2d);

if (surface_y > stone_surface_max_y)
stone_surface_max_y = surface_y;

// Get extent of floatland base terrain
// '+1' to avoid a layer of stone at y = MAX_MAP_GENERATION_LIMIT
s16 float_base_min = MAX_MAP_GENERATION_LIMIT + 1;
s16 float_base_max = MAX_MAP_GENERATION_LIMIT;
if (spflags & MGV7_FLOATLANDS)
floatBaseExtentFromMap(&float_base_min, &float_base_max, index2d);

u32 vi = vm->m_area.index(x, node_min.Y - 1, z);
u32 index3d = (z - node_min.Z) * zstride_1u1d + (x - node_min.X);

Expand All @@ -356,8 +442,16 @@ int MapgenV7::generateTerrain()
vm->m_data[vi] = n_stone; // Mountain terrain
if (y > stone_surface_max_y)
stone_surface_max_y = y;
} else if ((spflags & MGV7_FLOATLANDS) &&
((y >= float_base_min && y <= float_base_max) ||
getFloatlandMountainFromMap(index3d, index2d, y))) {
vm->m_data[vi] = n_stone; // Floatland terrain
stone_surface_max_y = node_max.Y;
} else if (y <= water_level) {
vm->m_data[vi] = n_water;
vm->m_data[vi] = n_water; // Ground level water
} else if ((spflags & MGV7_FLOATLANDS) &&
(y >= float_base_max && y <= floatland_level)) {
vm->m_data[vi] = n_water; // Floatland water
} else {
vm->m_data[vi] = n_air;
}
Expand All @@ -373,7 +467,7 @@ int MapgenV7::generateTerrain()

void MapgenV7::generateRidgeTerrain()
{
if (node_max.Y < water_level - 16)
if ((node_max.Y < water_level - 16) || (node_max.Y > shadow_limit))
return;

noise_ridge->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
Expand Down

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