Split up mapgen.cpp

1 files changed, 161 insertions, 0 deletions

diff --git a/src/mg_ore.cpp b/src/mg_ore.cpp
new file mode 100644
index 000000000..c8d224dc6
--- /dev/null
+++ b/src/mg_ore.cpp
@@ -0,0 +1,161 @@
+/*
+Minetest
+Copyright (C) 2010-2014 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include "mg_ore.h"
+#include "mapgen.h"
+#include "util/numeric.h"
+#include "map.h"
+#include "log.h"
+
+
+FlagDesc flagdesc_ore[] = {
+	{"absheight",            OREFLAG_ABSHEIGHT},
+	{"scatter_noisedensity", OREFLAG_DENSITY},
+	{"claylike_nodeisnt",    OREFLAG_NODEISNT},
+	{NULL,                   0}
+};
+
+///////////////////////////////////////////////////////////////////////////////
+
+
+Ore *createOre(OreType type)
+{
+	switch (type) {
+	case ORE_SCATTER:
+		return new OreScatter;
+	case ORE_SHEET:
+		return new OreSheet;
+	//case ORE_CLAYLIKE: //TODO: implement this!
+	//	return new OreClaylike;
+	default:
+		return NULL;
+	}
+}
+
+
+Ore::~Ore()
+{
+	delete np;
+	delete noise;
+}
+
+
+void Ore::placeOre(Mapgen *mg, u32 blockseed, v3s16 nmin, v3s16 nmax)
+{
+	int in_range = 0;
+
+	in_range |= (nmin.Y <= height_max && nmax.Y >= height_min);
+	if (flags & OREFLAG_ABSHEIGHT)
+		in_range |= (nmin.Y >= -height_max && nmax.Y <= -height_min) << 1;
+	if (!in_range)
+		return;
+
+	int ymin, ymax;
+	if (in_range & ORE_RANGE_MIRROR) {
+		ymin = MYMAX(nmin.Y, -height_max);
+		ymax = MYMIN(nmax.Y, -height_min);
+	} else {
+		ymin = MYMAX(nmin.Y, height_min);
+		ymax = MYMIN(nmax.Y, height_max);
+	}
+	if (clust_size >= ymax - ymin + 1)
+		return;
+
+	nmin.Y = ymin;
+	nmax.Y = ymax;
+	generate(mg->vm, mg->seed, blockseed, nmin, nmax);
+}
+
+
+void OreScatter::generate(ManualMapVoxelManipulator *vm, int seed,
+	u32 blockseed, v3s16 nmin, v3s16 nmax)
+{
+	PseudoRandom pr(blockseed);
+	MapNode n_ore(c_ore, 0, ore_param2);
+
+	int volume = (nmax.X - nmin.X + 1) *
+				 (nmax.Y - nmin.Y + 1) *
+				 (nmax.Z - nmin.Z + 1);
+	int csize     = clust_size;
+	int orechance = (csize * csize * csize) / clust_num_ores;
+	int nclusters = volume / clust_scarcity;
+
+	for (int i = 0; i != nclusters; i++) {
+		int x0 = pr.range(nmin.X, nmax.X - csize + 1);
+		int y0 = pr.range(nmin.Y, nmax.Y - csize + 1);
+		int z0 = pr.range(nmin.Z, nmax.Z - csize + 1);
+
+		if (np && (NoisePerlin3D(np, x0, y0, z0, seed) < nthresh))
+			continue;
+
+		for (int z1 = 0; z1 != csize; z1++)
+		for (int y1 = 0; y1 != csize; y1++)
+		for (int x1 = 0; x1 != csize; x1++) {
+			if (pr.range(1, orechance) != 1)
+				continue;
+
+			u32 i = vm->m_area.index(x0 + x1, y0 + y1, z0 + z1);
+			if (!CONTAINS(c_wherein, vm->m_data[i].getContent()))
+				continue;
+
+			vm->m_data[i] = n_ore;
+		}
+	}
+}
+
+
+void OreSheet::generate(ManualMapVoxelManipulator *vm, int seed,
+	u32 blockseed, v3s16 nmin, v3s16 nmax)
+{
+	PseudoRandom pr(blockseed + 4234);
+	MapNode n_ore(c_ore, 0, ore_param2);
+
+	int max_height = clust_size;
+	int y_start = pr.range(nmin.Y, nmax.Y - max_height);
+
+	if (!noise) {
+		int sx = nmax.X - nmin.X + 1;
+		int sz = nmax.Z - nmin.Z + 1;
+		noise = new Noise(np, 0, sx, sz);
+	}
+	noise->seed = seed + y_start;
+	noise->perlinMap2D(nmin.X, nmin.Z);
+
+	int index = 0;
+	for (int z = nmin.Z; z <= nmax.Z; z++)
+	for (int x = nmin.X; x <= nmax.X; x++) {
+		float noiseval = noise->result[index++];
+		if (noiseval < nthresh)
+			continue;
+
+		int height = max_height * (1. / pr.range(1, 3));
+		int y0 = y_start + np->scale * noiseval; //pr.range(1, 3) - 1;
+		int y1 = y0 + height;
+		for (int y = y0; y != y1; y++) {
+			u32 i = vm->m_area.index(x, y, z);
+			if (!vm->m_area.contains(i))
+				continue;
+			if (!CONTAINS(c_wherein, vm->m_data[i].getContent()))
+				continue;
+
+			vm->m_data[i] = n_ore;
+		}
+	}
+}
+