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::zerowing-base=422

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This commit is contained in:
Rudolf Polzer
2011-01-11 14:39:55 +01:00
parent 6ce0c65e77
commit 94cb905da9
9 changed files with 1065 additions and 59 deletions
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54
libs/mathlib.h
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@@ -24,6 +24,7 @@ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
// mathlib.h
#include <math.h>
#include <float.h>
#ifdef __cplusplus
@@ -40,6 +41,12 @@ typedef vec_t vec3_t[3];
typedef vec_t vec5_t[5];
typedef vec_t vec4_t[4];
// Smallest positive value for vec_t such that 1.0 + VEC_SMALLEST_EPSILON_AROUND_ONE != 1.0.
// In the case of 32 bit floats (which is almost certainly the case), it's 0.00000011921.
// Don't forget that your epsilons should depend on the possible range of values,
// because for example adding VEC_SMALLEST_EPSILON_AROUND_ONE to 1024.0 will have no effect.
#define VEC_SMALLEST_EPSILON_AROUND_ONE FLT_EPSILON
#define SIDE_FRONT 0
#define SIDE_ON 2
#define SIDE_BACK 1
@@ -83,6 +90,9 @@ extern const vec3_t g_vec3_axis_z;
qboolean VectorCompare (const vec3_t v1, const vec3_t v2);
qboolean VectorIsOnAxis(vec3_t v);
qboolean VectorIsOnAxialPlane(vec3_t v);
vec_t VectorLength(const vec3_t v);
void VectorMA( const vec3_t va, vec_t scale, const vec3_t vb, vec3_t vc );
@@ -419,6 +429,50 @@ vec_t ray_intersect_plane(const ray_t* ray, const vec3_t normal, vec_t dist);
int plane_intersect_planes(const vec4_t plane1, const vec4_t plane2, const vec4_t plane3, vec3_t intersection);
////////////////////////////////////////////////////////////////////////////////
// Below is double-precision math stuff. This was initially needed by the new
// "base winding" code in q3map2 brush processing in order to fix the famous
// "disappearing triangles" issue. These definitions can be used wherever extra
// precision is needed.
////////////////////////////////////////////////////////////////////////////////
typedef double vec_accu_t;
typedef vec_accu_t vec3_accu_t[3];
// Smallest positive value for vec_accu_t such that 1.0 + VEC_ACCU_SMALLEST_EPSILON_AROUND_ONE != 1.0.
// In the case of 64 bit doubles (which is almost certainly the case), it's 0.00000000000000022204.
// Don't forget that your epsilons should depend on the possible range of values,
// because for example adding VEC_ACCU_SMALLEST_EPSILON_AROUND_ONE to 1024.0 will have no effect.
#define VEC_ACCU_SMALLEST_EPSILON_AROUND_ONE DBL_EPSILON
vec_accu_t VectorLengthAccu(const vec3_accu_t v);
// I have a feeling it may be safer to break these #define functions out into actual functions
// in order to avoid accidental loss of precision. For example, say you call
// VectorScaleAccu(vec3_t, vec_t, vec3_accu_t). The scale would take place in 32 bit land
// and the result would be cast to 64 bit, which would cause total loss of precision when
// scaling by a large factor.
//#define DotProductAccu(x, y) ((x)[0] * (y)[0] + (x)[1] * (y)[1] + (x)[2] * (y)[2])
//#define VectorSubtractAccu(a, b, c) ((c)[0] = (a)[0] - (b)[0], (c)[1] = (a)[1] - (b)[1], (c)[2] = (a)[2] - (b)[2])
//#define VectorAddAccu(a, b, c) ((c)[0] = (a)[0] + (b)[0], (c)[1] = (a)[1] + (b)[1], (c)[2] = (a)[2] + (b)[2])
//#define VectorCopyAccu(a, b) ((b)[0] = (a)[0], (b)[1] = (a)[1], (b)[2] = (a)[2])
//#define VectorScaleAccu(a, b, c) ((c)[0] = (b) * (a)[0], (c)[1] = (b) * (a)[1], (c)[2] = (b) * (a)[2])
//#define CrossProductAccu(a, b, c) ((c)[0] = (a)[1] * (b)[2] - (a)[2] * (b)[1], (c)[1] = (a)[2] * (b)[0] - (a)[0] * (b)[2], (c)[2] = (a)[0] * (b)[1] - (a)[1] * (b)[0])
//#define Q_rintAccu(in) ((vec_accu_t) floor(in + 0.5))
vec_accu_t DotProductAccu(const vec3_accu_t a, const vec3_accu_t b);
void VectorSubtractAccu(const vec3_accu_t a, const vec3_accu_t b, vec3_accu_t out);
void VectorAddAccu(const vec3_accu_t a, const vec3_accu_t b, vec3_accu_t out);
void VectorCopyAccu(const vec3_accu_t in, vec3_accu_t out);
void VectorScaleAccu(const vec3_accu_t in, vec_accu_t scaleFactor, vec3_accu_t out);
void CrossProductAccu(const vec3_accu_t a, const vec3_accu_t b, vec3_accu_t out);
vec_accu_t Q_rintAccu(vec_accu_t val);
void VectorCopyAccuToRegular(const vec3_accu_t in, vec3_t out);
void VectorCopyRegularToAccu(const vec3_t in, vec3_accu_t out);
vec_accu_t VectorNormalizeAccu(const vec3_accu_t in, vec3_accu_t out);
#ifdef __cplusplus
}
#endif