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-rw-r--r--src/SetChunkData.cpp2
-rw-r--r--src/Tracer.cpp90
-rw-r--r--src/Tracer.h7
-rw-r--r--src/Vector3.h32
4 files changed, 88 insertions, 43 deletions
diff --git a/src/SetChunkData.cpp b/src/SetChunkData.cpp
index f2b58570d..c0ae31fd3 100644
--- a/src/SetChunkData.cpp
+++ b/src/SetChunkData.cpp
@@ -103,7 +103,7 @@ void cSetChunkData::CalculateHeightMap(void)
int index = cChunkDef::MakeIndexNoCheck(x, y, z);
if (m_BlockTypes[index] != E_BLOCK_AIR)
{
- m_HeightMap[x + z * cChunkDef::Width] = (HEIGHTTYPE)y;
+ m_HeightMap[x + z * cChunkDef::Width] = static_cast<HEIGHTTYPE>(y);
break;
}
} // for y
diff --git a/src/Tracer.cpp b/src/Tracer.cpp
index e604f4a5b..b6b0fd634 100644
--- a/src/Tracer.cpp
+++ b/src/Tracer.cpp
@@ -12,17 +12,32 @@
+const float FLOAT_EPSILON = 0.0001f; // TODO: Stash this in some header where it can be reused
+
+
+const std::array<const Vector3f, 6>& cTracer::m_NormalTable(void)
+{
+ static std::array<const Vector3f, 6>* table =
+ new std::array<const Vector3f, 6>
+ {
+ {
+ Vector3f(-1, 0, 0), // 1: -x
+ Vector3f( 0, 0, -1), // 2: -z
+ Vector3f( 1, 0, 0), // 3: +x
+ Vector3f( 0, 0, 1), // 4: +z
+ Vector3f( 0, 1, 0), // 5: +y
+ Vector3f( 0, -1, 0) // 6: -y
+ }
+ };
+
+ return *table;
+};
+
cTracer::cTracer(cWorld * a_World):
m_World(a_World)
{
- m_NormalTable[0].Set(-1, 0, 0);
- m_NormalTable[1].Set( 0, 0, -1);
- m_NormalTable[2].Set( 1, 0, 0);
- m_NormalTable[3].Set( 0, 0, 1);
- m_NormalTable[4].Set( 0, 1, 0);
- m_NormalTable[5].Set( 0, -1, 0);
}
@@ -37,7 +52,7 @@ cTracer::~cTracer()
-float cTracer::SigNum(float a_Num)
+int cTracer::SigNum(float a_Num)
{
if (a_Num < 0.f)
{
@@ -56,26 +71,28 @@ float cTracer::SigNum(float a_Num)
void cTracer::SetValues(const Vector3f & a_Start, const Vector3f & a_Direction)
{
+ // Since this method should only be called by Trace, zero length vectors should already have been taken care of
+ ASSERT(a_Direction.HasNonZeroLength());
+
// calculate the direction of the ray (linear algebra)
dir = a_Direction;
// decide which direction to start walking in
- step.x = (int) SigNum(dir.x);
- step.y = (int) SigNum(dir.y);
- step.z = (int) SigNum(dir.z);
+ step.x = SigNum(dir.x);
+ step.y = SigNum(dir.y);
+ step.z = SigNum(dir.z);
+
// normalize the direction vector
- if (dir.SqrLength() > 0.f)
- {
- dir.Normalize();
- }
+ dir.Normalize();
+
// how far we must move in the ray direction before
// we encounter a new voxel in x-direction
// same but y-direction
if (dir.x != 0.f)
{
- tDelta.x = 1 / fabs(dir.x);
+ tDelta.x = 1 / std::abs(dir.x);
}
else
{
@@ -83,7 +100,7 @@ void cTracer::SetValues(const Vector3f & a_Start, const Vector3f & a_Direction)
}
if (dir.y != 0.f)
{
- tDelta.y = 1 / fabs(dir.y);
+ tDelta.y = 1 / std::abs(dir.y);
}
else
{
@@ -91,44 +108,45 @@ void cTracer::SetValues(const Vector3f & a_Start, const Vector3f & a_Direction)
}
if (dir.z != 0.f)
{
- tDelta.z = 1 / fabs(dir.z);
+ tDelta.z = 1 / std::abs(dir.z);
}
else
{
tDelta.z = 0;
}
+
// start voxel coordinates
- pos.x = (int)floorf(a_Start.x);
- pos.y = (int)floorf(a_Start.y);
- pos.z = (int)floorf(a_Start.z);
+ pos.x = static_cast<int>(floorf(a_Start.x));
+ pos.y = static_cast<int>(floorf(a_Start.y));
+ pos.z = static_cast<int>(floorf(a_Start.z));
// calculate distance to first intersection in the voxel we start from
if (dir.x < 0)
{
- tMax.x = ((float)pos.x - a_Start.x) / dir.x;
+ tMax.x = (static_cast<float>(pos.x) - a_Start.x) / dir.x;
}
else
{
- tMax.x = (((float)pos.x + 1) - a_Start.x) / dir.x;
+ tMax.x = (static_cast<float>(pos.x + 1) - a_Start.x) / dir.x; // TODO: Possible division by zero
}
if (dir.y < 0)
{
- tMax.y = ((float)pos.y - a_Start.y) / dir.y;
+ tMax.y = (static_cast<float>(pos.y) - a_Start.y) / dir.y;
}
else
{
- tMax.y = (((float)pos.y + 1) - a_Start.y) / dir.y;
+ tMax.y = (static_cast<float>(pos.y + 1) - a_Start.y) / dir.y; // TODO: Possible division by zero
}
if (dir.z < 0)
{
- tMax.z = ((float)pos.z - a_Start.z) / dir.z;
+ tMax.z = (static_cast<float>(pos.z) - a_Start.z) / dir.z;
}
else
{
- tMax.z = (((float)pos.z + 1) - a_Start.z) / dir.z;
+ tMax.z = (static_cast<float>(pos.z + 1) - a_Start.z) / dir.z; // TODO: Possible division by zero
}
}
@@ -138,6 +156,11 @@ void cTracer::SetValues(const Vector3f & a_Start, const Vector3f & a_Direction)
bool cTracer::Trace(const Vector3f & a_Start, const Vector3f & a_Direction, int a_Distance, bool a_LineOfSight)
{
+ if (!a_Direction.HasNonZeroLength())
+ {
+ return false;
+ }
+
if ((a_Start.y < 0) || (a_Start.y >= cChunkDef::Height))
{
LOGD("%s: Start Y is outside the world (%.2f), not tracing.", __FUNCTION__, a_Start.y);
@@ -146,18 +169,18 @@ bool cTracer::Trace(const Vector3f & a_Start, const Vector3f & a_Direction, int
SetValues(a_Start, a_Direction);
- Vector3f End = a_Start + (dir * (float)a_Distance);
+ Vector3f End = a_Start + (dir * static_cast<float>(a_Distance));
if (End.y < 0)
{
- float dist = -a_Start.y / dir.y;
+ float dist = -a_Start.y / dir.y; // No division by 0 possible
End = a_Start + (dir * dist);
}
// end voxel coordinates
- end1.x = (int)floorf(End.x);
- end1.y = (int)floorf(End.y);
- end1.z = (int)floorf(End.z);
+ end1.x = static_cast<int>(floorf(End.x));
+ end1.y = static_cast<int>(floorf(End.y));
+ end1.z = static_cast<int>(floorf(End.z));
// check if first is occupied
if (pos.Equals(end1))
@@ -241,7 +264,7 @@ bool cTracer::Trace(const Vector3f & a_Start, const Vector3f & a_Direction, int
int Normal = GetHitNormal(a_Start, End, pos);
if (Normal > 0)
{
- HitNormal = m_NormalTable[Normal-1];
+ HitNormal = m_NormalTable()[Normal - 1];
}
return true;
}
@@ -295,8 +318,7 @@ int cTracer::intersect3D_SegmentPlane(const Vector3f & a_Origin, const Vector3f
float D = a_PlaneNormal.Dot(u); // dot(Pn.n, u);
float N = -(a_PlaneNormal.Dot(w)); // -dot(a_Plane.n, w);
- const float EPSILON = 0.0001f;
- if (fabs(D) < EPSILON)
+ if (std::abs(D) < FLOAT_EPSILON)
{
// segment is parallel to plane
if (N == 0.0)
diff --git a/src/Tracer.h b/src/Tracer.h
index ec87d449e..31531719f 100644
--- a/src/Tracer.h
+++ b/src/Tracer.h
@@ -3,6 +3,8 @@
#include "Vector3.h"
+#include <array>
+
@@ -61,10 +63,11 @@ private:
/// Return 1 through 6 for the following block faces, repectively: -x, -z, x, z, y, -y
int GetHitNormal( const Vector3f & start, const Vector3f & end, const Vector3i & a_BlockPos);
- float SigNum( float a_Num);
+ /// Signum function
+ int SigNum( float a_Num);
cWorld* m_World;
- Vector3f m_NormalTable[6];
+ static const std::array<const Vector3f, 6> & m_NormalTable(void);
Vector3f dir;
Vector3f tDelta;
diff --git a/src/Vector3.h b/src/Vector3.h
index c5431438e..c5a3f9f05 100644
--- a/src/Vector3.h
+++ b/src/Vector3.h
@@ -78,6 +78,20 @@ public:
);
}
+ inline bool HasNonZeroLength(void) const
+ {
+ #ifndef __GNUC__
+ #pragma clang diagnostics push
+ #pragma clang diagnostics ignored "-Wfloat-equal"
+ #endif
+
+ return ((x != 0) || (y != 0) || (z != 0));
+
+ #ifndef __GNUC__
+ #pragma clang diagnostics pop
+ #endif
+ }
+
inline double Length(void) const
{
return sqrt(static_cast<double>(x * x + y * y + z * z));
@@ -119,13 +133,19 @@ public:
inline bool Equals(const Vector3<T> & a_Rhs) const
{
- // Perform a bitwise comparison of the contents - we want to know whether this object is exactly equal
+ // Perform a strict comparison of the contents - we want to know whether this object is exactly equal
// To perform EPS-based comparison, use the EqualsEps() function
- return (
- (memcmp(&x, &a_Rhs.x, sizeof(x)) == 0) &&
- (memcmp(&y, &a_Rhs.y, sizeof(y)) == 0) &&
- (memcmp(&z, &a_Rhs.z, sizeof(z)) == 0)
- );
+
+ #ifndef __GNUC__
+ #pragma clang diagnostics push
+ #pragma clang diagnostics ignored "-Wfloat-equal"
+ #endif
+
+ return !((x != a_Rhs.x) || (y != a_Rhs.y) || (z != a_Rhs.z));
+
+ #ifndef __GNUC__
+ #pragma clang diagnostics pop
+ #endif
}
inline bool EqualsEps(const Vector3<T> & a_Rhs, T a_Eps) const
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-16 23:28:08 +0100