X-Git-Url: https://git.lizzy.rs/?a=blobdiff_plain;f=src%2Futil%2Fnumeric.cpp;h=99e4cfb5ce24d5804b4342058aa6bd8fecca272a;hb=a93712458b2f8914fdb43ec436c5caf908ba93b8;hp=12c91be913ff05ce3a2529781703998d0e40cf30;hpb=ae9b1aa1774aedca8f452514d9462c281e36773a;p=minetest.git

diff --git a/src/util/numeric.cpp b/src/util/numeric.cpp
index 12c91be91..99e4cfb5c 100644
--- a/src/util/numeric.cpp
+++ b/src/util/numeric.cpp
@@ -61,13 +61,13 @@ u64 murmur_hash_64_ua(const void *key, int len, unsigned int seed)
 	const int r = 47;
 	u64 h = seed ^ (len * m);
 
-	const u64 *data = (const u64 *)key;
-	const u64 *end = data + (len / 8);
+	const u8 *data = (const u8 *)key;
+	const u8 *end = data + (len / 8) * 8;
 
 	while (data != end) {
 		u64 k;
 		memcpy(&k, data, sizeof(u64));
-		data++;
+		data += sizeof(u64);
 
 		k *= m;
 		k ^= k >> r;
@@ -106,10 +106,6 @@ u64 murmur_hash_64_ua(const void *key, int len, unsigned int seed)
 bool isBlockInSight(v3s16 blockpos_b, v3f camera_pos, v3f camera_dir,
 		f32 camera_fov, f32 range, f32 *distance_ptr)
 {
-	// Maximum radius of a block.  The magic number is
-	// sqrt(3.0) / 2.0 in literal form.
-	const f32 block_max_radius = 0.866025403784 * MAP_BLOCKSIZE * BS;
-
 	v3s16 blockpos_nodes = blockpos_b * MAP_BLOCKSIZE;
 
 	// Block center position
@@ -123,25 +119,25 @@ bool isBlockInSight(v3s16 blockpos_b, v3f camera_pos, v3f camera_dir,
 	v3f blockpos_relative = blockpos - camera_pos;
 
 	// Total distance
-	f32 d = MYMAX(0, blockpos_relative.getLength() - block_max_radius);
+	f32 d = MYMAX(0, blockpos_relative.getLength() - BLOCK_MAX_RADIUS);
 
-	if(distance_ptr)
+	if (distance_ptr)
 		*distance_ptr = d;
 
 	// If block is far away, it's not in sight
-	if(d > range)
+	if (d > range)
 		return false;
 
 	// If block is (nearly) touching the camera, don't
 	// bother validating further (that is, render it anyway)
-	if(d == 0)
+	if (d == 0)
 		return true;
 
 	// Adjust camera position, for purposes of computing the angle,
 	// such that a block that has any portion visible with the
 	// current camera position will have the center visible at the
 	// adjusted postion
-	f32 adjdist = block_max_radius / cos((M_PI - camera_fov) / 2);
+	f32 adjdist = BLOCK_MAX_RADIUS / cos((M_PI - camera_fov) / 2);
 
 	// Block position relative to adjusted camera
 	v3f blockpos_adj = blockpos - (camera_pos - camera_dir * adjdist);
@@ -157,7 +153,7 @@ bool isBlockInSight(v3s16 blockpos_b, v3f camera_pos, v3f camera_dir,
 	// HOTFIX: use sligthly increased angle (+10%) to fix too agressive
 	// culling. Somebody have to find out whats wrong with the math here.
 	// Previous value: camera_fov / 2
-	if(cosangle < cos(camera_fov * 0.55))
+	if (cosangle < std::cos(camera_fov * 0.55f))
 		return false;
 
 	return true;
@@ -165,13 +161,47 @@ bool isBlockInSight(v3s16 blockpos_b, v3f camera_pos, v3f camera_dir,
 
 s16 adjustDist(s16 dist, float zoom_fov)
 {
-	// 1.775 ~= 72 * PI / 180 * 1.4, the default on the client
-	const float default_fov = 1.775f;
-	// heuristic cut-off for zooming
-	if (zoom_fov > default_fov / 2.0f)
+	// 1.775 ~= 72 * PI / 180 * 1.4, the default FOV on the client.
+	// The heuristic threshold for zooming is half of that.
+	static constexpr const float threshold_fov = 1.775f / 2.0f;
+	if (zoom_fov < 0.001f || zoom_fov > threshold_fov)
 		return dist;
 
-	// new_dist = dist * ((1 - cos(FOV / 2)) / (1-cos(zoomFOV /2))) ^ (1/3)
-	return round(dist * cbrt((1.0f - cos(default_fov / 2.0f)) /
-		(1.0f - cos(zoom_fov / 2.0f))));
+	return std::round(dist * std::cbrt((1.0f - std::cos(threshold_fov)) /
+		(1.0f - std::cos(zoom_fov / 2.0f))));
+}
+
+void setPitchYawRollRad(core::matrix4 &m, const v3f &rot)
+{
+	f64 a1 = rot.Z, a2 = rot.X, a3 = rot.Y;
+	f64 c1 = cos(a1), s1 = sin(a1);
+	f64 c2 = cos(a2), s2 = sin(a2);
+	f64 c3 = cos(a3), s3 = sin(a3);
+	f32 *M = m.pointer();
+
+	M[0] = s1 * s2 * s3 + c1 * c3;
+	M[1] = s1 * c2;
+	M[2] = s1 * s2 * c3 - c1 * s3;
+
+	M[4] = c1 * s2 * s3 - s1 * c3;
+	M[5] = c1 * c2;
+	M[6] = c1 * s2 * c3 + s1 * s3;
+
+	M[8] = c2 * s3;
+	M[9] = -s2;
+	M[10] = c2 * c3;
+}
+
+v3f getPitchYawRollRad(const core::matrix4 &m)
+{
+	const f32 *M = m.pointer();
+
+	f64 a1 = atan2(M[1], M[5]);
+	f32 c2 = std::sqrt((f64)M[10]*M[10] + (f64)M[8]*M[8]);
+	f32 a2 = atan2f(-M[9], c2);
+	f64 c1 = cos(a1);
+	f64 s1 = sin(a1);
+	f32 a3 = atan2f(s1*M[6] - c1*M[2], c1*M[0] - s1*M[4]);
+
+	return v3f(a2, a3, a1);
 }