HTTP API: Allow binary downloads and headers (#8573)

[oweals/minetest.git] / src / util / numeric.cpp

diff --git a/src/util/numeric.cpp b/src/util/numeric.cpp
index ebc81185f3918b187a84fe461af24fe84cd83f43..1af3f66be8df9f096737e8a4809cf497688e905c 100644 (file)
--- a/src/util/numeric.cpp
+++ b/src/util/numeric.cpp
@@ -24,6 +24,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "noise.h" // PseudoRandom, PcgRandom
 #include "threading/mutex_auto_lock.h"
 #include <cstring>
+#include <cmath>
 
 
 // myrand
@@ -60,13 +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;
@@ -107,7 +108,7 @@ bool isBlockInSight(v3s16 blockpos_b, v3f camera_pos, v3f camera_dir,
 {
        // 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;
+       static constexpr const f32 block_max_radius = 0.866025403784f * MAP_BLOCKSIZE * BS;
 
        v3s16 blockpos_nodes = blockpos_b * MAP_BLOCKSIZE;
 
@@ -124,16 +125,16 @@ bool isBlockInSight(v3s16 blockpos_b, v3f camera_pos, v3f camera_dir,
        // Total distance
        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,
@@ -156,8 +157,55 @@ 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;
 }
+
+s16 adjustDist(s16 dist, float zoom_fov)
+{
+       // 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;
+
+       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);
+}