Clean up Noise macros

minetest · Dec 11, 2014 · fb80a7c · fb80a7c
1 parent c07f15e
commit fb80a7c
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Showing 5 changed files with 108 additions and 67 deletions.
diff --git a/src/mapgen_v5.cpp b/src/mapgen_v5.cpp
@@ -202,7 +202,7 @@ int MapgenV5::getGroundLevelAtPoint(v2s16 p) {
 
 	s16 level = -31000;
 	for (s16 y = search_top; y >= search_base; y--) {
-		float n_ground = NoisePerlin3DEased(&noise_ground->np, p.X, y, p.Y, seed);
+		float n_ground = NoisePerlin3D(&noise_ground->np, p.X, y, p.Y, seed);
 		if(n_ground * f > y - h) {
 			if(y >= search_top - 7)
 				break;

diff --git a/src/mapgen_v6.cpp b/src/mapgen_v6.cpp
@@ -246,13 +246,13 @@ float MapgenV6::baseTerrainLevelFromNoise(v2s16 p) {
 	if (flags & MG_FLAT)
 		return water_level;
 
-	float terrain_base   = NoisePerlin2DPosOffset(&noise_terrain_base->np,
+	float terrain_base   = NoisePerlin2D_PO(&noise_terrain_base->np,
 							p.X, 0.5, p.Y, 0.5, seed);
-	float terrain_higher = NoisePerlin2DPosOffset(&noise_terrain_higher->np,
+	float terrain_higher = NoisePerlin2D_PO(&noise_terrain_higher->np,
 							p.X, 0.5, p.Y, 0.5, seed);
-	float steepness      = NoisePerlin2DPosOffset(&noise_steepness->np,
+	float steepness      = NoisePerlin2D_PO(&noise_steepness->np,
 							p.X, 0.5, p.Y, 0.5, seed);
-	float height_select  = NoisePerlin2DNoTxfmPosOffset(&noise_height_select->np,
+	float height_select  = NoisePerlin2D_PO(&noise_height_select->np,
 							p.X, 0.5, p.Y, 0.5, seed);
 
 	return baseTerrainLevel(terrain_base, terrain_higher,
@@ -547,36 +547,16 @@ void MapgenV6::calculateNoise() {
 	int x = node_min.X;
 	int z = node_min.Z;
 
-	// Need to adjust for the original implementation's +.5 offset...
 	if (!(flags & MG_FLAT)) {
-		noise_terrain_base->perlinMap2D(
-			x + 0.5 * noise_terrain_base->np.spread.X,
-			z + 0.5 * noise_terrain_base->np.spread.Z);
-
-		noise_terrain_higher->perlinMap2D(
-			x + 0.5 * noise_terrain_higher->np.spread.X,
-			z + 0.5 * noise_terrain_higher->np.spread.Z);
-
-		noise_steepness->perlinMap2D(
-			x + 0.5 * noise_steepness->np.spread.X,
-			z + 0.5 * noise_steepness->np.spread.Z);
-
-		noise_height_select->perlinMap2D(
-			x + 0.5 * noise_height_select->np.spread.X,
-			z + 0.5 * noise_height_select->np.spread.Z);
-
-		noise_mud->perlinMap2D(
-			x + 0.5 * noise_mud->np.spread.X,
-			z + 0.5 * noise_mud->np.spread.Z);
+		noise_terrain_base->perlinMap2D_PO(x, 0.5, z, 0.5);
+		noise_terrain_higher->perlinMap2D_PO(x, 0.5, z, 0.5);
+		noise_steepness->perlinMap2D_PO(x, 0.5, z, 0.5);
+		noise_height_select->perlinMap2D_PO(x, 0.5, z, 0.5);
+		noise_mud->perlinMap2D_PO(x, 0.5, z, 0.5);
 	}
 
-	noise_beach->perlinMap2D(
-		x + 0.2 * noise_beach->np.spread.X,
-		z + 0.7 * noise_beach->np.spread.Z);
-
-	noise_biome->perlinMap2D(
-		x + 0.6 * noise_biome->np.spread.X,
-		z + 0.2 * noise_biome->np.spread.Z);
+	noise_beach->perlinMap2D_PO(x, 0.2, z, 0.7);
+	noise_biome->perlinMap2D_PO(x, 0.6, z, 0.2);
 }
 
 

diff --git a/src/mapgen_v7.cpp b/src/mapgen_v7.cpp
@@ -173,7 +173,7 @@ int MapgenV7::getGroundLevelAtPoint(v2s16 p) {
 
 	// Ridge/river terrain calculation
 	float width = 0.3;
-	float uwatern = NoisePerlin2DNoTxfm(&noise_ridge_uwater->np, p.X, p.Y, seed) * 2;
+	float uwatern = NoisePerlin2D(&noise_ridge_uwater->np, p.X, p.Y, seed) * 2;
 	// actually computing the depth of the ridge is much more expensive;
 	// if inside a river, simply guess
 	if (uwatern >= -width && uwatern <= width)

diff --git a/src/noise.cpp b/src/noise.cpp
@@ -314,7 +314,60 @@ float contour(float v)
 }
 
 
-///////////////////////// [ New perlin stuff ] ////////////////////////////
+///////////////////////// [ New noise ] ////////////////////////////
+
+
+float NoisePerlin2D(NoiseParams *np, float x, float y, int seed)
+{
+	float a = 0;
+	float f = 1.0;
+	float g = 1.0;
+
+	x /= np->spread.X;
+	y /= np->spread.Y;
+	seed += np->seed;
+
+	for (size_t i = 0; i < np->octaves; i++) {
+		float noiseval = noise2d_gradient(x * f, y * f, seed + i,
+			np->flags & (NOISE_FLAG_DEFAULTS | NOISE_FLAG_EASED));
+
+		if (np->flags & NOISE_FLAG_ABSVALUE)
+			noiseval = fabs(noiseval);
+
+		a += g * noiseval;
+		f *= np->lacunarity;
+		g *= np->persist;
+	}
+
+	return np->offset + a * np->scale;
+}
+
+
+float NoisePerlin3D(NoiseParams *np, float x, float y, float z, int seed)
+{
+	float a = 0;
+	float f = 1.0;
+	float g = 1.0;
+
+	x /= np->spread.X;
+	y /= np->spread.Y;
+	z /= np->spread.Z;
+	seed += np->seed;
+
+	for (size_t i = 0; i < np->octaves; i++) {
+		float noiseval = noise3d_gradient(x * f, y * f, z * f, seed + i,
+			np->flags & NOISE_FLAG_EASED);
+
+		if (np->flags & NOISE_FLAG_ABSVALUE)
+			noiseval = fabs(noiseval);
+
+		a += g * noiseval;
+		f *= np->lacunarity;
+		g *= np->persist;
+	}
+
+	return np->offset + a * np->scale;
+}
 
 
 Noise::Noise(NoiseParams *np_, int seed, int sx, int sy, int sz)

diff --git a/src/noise.h b/src/noise.h
@@ -151,13 +151,54 @@ class Noise {
 	float *perlinMap2D(float x, float y, float *persistence_map=NULL);
 	float *perlinMap3D(float x, float y, float z, float *persistence_map=NULL);
 
+	inline float *perlinMap2D_PO(float x, float xoff, float y, float yoff,
+		float *persistence_map=NULL)
+	{
+		return perlinMap2D(
+			x + xoff * np.spread.X,
+			y + yoff * np.spread.Y,
+			persistence_map);
+	}
+
+	inline float *perlinMap3D_PO(float x, float xoff, float y, float yoff,
+		float z, float zoff, float *persistence_map=NULL)
+	{
+		return perlinMap3D(
+			x + xoff * np.spread.X,
+			y + yoff * np.spread.Y,
+			z + zoff * np.spread.Z,
+			persistence_map);
+	}
+
 private:
 	void allocBuffers();
 	void resizeNoiseBuf(bool is3d);
 	void updateResults(float g, float *gmap, float *persistence_map, size_t bufsize);
 
 };
 
+float NoisePerlin2D(NoiseParams *np, float x, float y, int seed);
+float NoisePerlin3D(NoiseParams *np, float x, float y, float z, int seed);
+
+inline float NoisePerlin2D_PO(NoiseParams *np, float x, float xoff,
+	float y, float yoff, int seed)
+{
+	return NoisePerlin2D(np,
+		x + xoff * np->spread.X,
+		y + yoff * np->spread.Y,
+		seed);
+}
+
+inline float NoisePerlin3D_PO(NoiseParams *np, float x, float xoff,
+	float y, float yoff, float z, float zoff, int seed)
+{
+	return NoisePerlin3D(np,
+		x + xoff * np->spread.X,
+		y + yoff * np->spread.Y,
+		z + zoff * np->spread.Z,
+		seed);
+}
+
 // Return value: -1 ... 1
 float noise2d(int x, int y, int seed);
 float noise3d(int x, int y, int z, int seed);
@@ -184,38 +225,5 @@ inline float easeCurve(float t)
 
 float contour(float v);
 
-#define NoisePerlin2D(np, x, y, s) \
-		((np)->offset + (np)->scale * noise2d_perlin( \
-		(float)(x) / (np)->spread.X, \
-		(float)(y) / (np)->spread.Y, \
-		(s) + (np)->seed, (np)->octaves, (np)->persist))
-
-#define NoisePerlin2DNoTxfm(np, x, y, s) \
-		(noise2d_perlin( \
-		(float)(x) / (np)->spread.X, \
-		(float)(y) / (np)->spread.Y, \
-		(s) + (np)->seed, (np)->octaves, (np)->persist))
-
-#define NoisePerlin2DPosOffset(np, x, xoff, y, yoff, s) \
-		((np)->offset + (np)->scale * noise2d_perlin( \
-		(float)(xoff) + (float)(x) / (np)->spread.X, \
-		(float)(yoff) + (float)(y) / (np)->spread.Y, \
-		(s) + (np)->seed, (np)->octaves, (np)->persist))
-
-#define NoisePerlin2DNoTxfmPosOffset(np, x, xoff, y, yoff, s) \
-		(noise2d_perlin( \
-		(float)(xoff) + (float)(x) / (np)->spread.X, \
-		(float)(yoff) + (float)(y) / (np)->spread.Y, \
-		(s) + (np)->seed, (np)->octaves, (np)->persist))
-
-#define NoisePerlin3D(np, x, y, z, s) ((np)->offset + (np)->scale * \
-		noise3d_perlin((float)(x) / (np)->spread.X, (float)(y) / (np)->spread.Y, \
-		(float)(z) / (np)->spread.Z, (s) + (np)->seed, (np)->octaves, (np)->persist))
-
-#define NoisePerlin3DEased(np, x, y, z, s) ((np)->offset + (np)->scale * \
-		noise3d_perlin((float)(x) / (np)->spread.X, (float)(y) / (np)->spread.Y, \
-		(float)(z) / (np)->spread.Z, (s) + (np)->seed, (np)->octaves, \
-		(np)->persist, true))
-
 #endif