diff options
Diffstat (limited to 'redist')
-rw-r--r-- | redist/json_helpers.c | 4 | ||||
-rw-r--r-- | redist/linmath.c | 71 | ||||
-rw-r--r-- | redist/linmath.h | 7 |
3 files changed, 61 insertions, 21 deletions
diff --git a/redist/json_helpers.c b/redist/json_helpers.c index b7ccb40..4a3ba55 100644 --- a/redist/json_helpers.c +++ b/redist/json_helpers.c @@ -76,6 +76,7 @@ uint32_t JSON_STRING_LEN; char* load_file_to_mem(const char* path) { FILE * f = fopen( path, "r" ); + if (f==NULL) return NULL; fseek( f, 0, SEEK_END ); int len = ftell( f ); fseek( f, 0, SEEK_SET ); @@ -116,7 +117,10 @@ static uint16_t json_load_array(const char* JSON_STRING, jsmntok_t* tokens, uint void json_load_file(const char* path) { uint32_t i = 0; + char* JSON_STRING = load_file_to_mem(path); + if (JSON_STRING==NULL) return; + JSON_STRING_LEN = strlen(JSON_STRING); jsmn_parser parser; diff --git a/redist/linmath.c b/redist/linmath.c index dec7d64..37d8e7a 100644 --- a/redist/linmath.c +++ b/redist/linmath.c @@ -3,6 +3,7 @@ #include "linmath.h" #include <math.h> #include <float.h> +#include <string.h> void cross3d( FLT * out, const FLT * a, const FLT * b ) { @@ -152,7 +153,7 @@ FLT quatmagnitude( const FLT * q ) FLT quatinvsqmagnitude( const FLT * q ) { - return ((FLT)1.)/((q[0]*q[0])+(q[1]*q[1])+(q[2]*q[2])+(q[3]*q[3])); + return ((FLT)1.)/FLT_SQRT((q[0]*q[0])+(q[1]*q[1])+(q[2]*q[2])+(q[3]*q[3])); } @@ -168,17 +169,17 @@ void quattomatrix(FLT * matrix44, const FLT * qin) quatnormalize(q, qin); //Reduced calulation for speed - FLT xx = 2 * q[0] * q[0]; - FLT xy = 2 * q[0] * q[1]; - FLT xz = 2 * q[0] * q[2]; - FLT xw = 2 * q[0] * q[3]; + FLT xx = 2 * q[1] * q[1]; + FLT xy = 2 * q[1] * q[2]; + FLT xz = 2 * q[1] * q[3]; + FLT xw = 2 * q[1] * q[0]; - FLT yy = 2 * q[1] * q[1]; - FLT yz = 2 * q[1] * q[2]; - FLT yw = 2 * q[1] * q[3]; + FLT yy = 2 * q[2] * q[2]; + FLT yz = 2 * q[2] * q[3]; + FLT yw = 2 * q[2] * q[0]; - FLT zz = 2 * q[2] * q[2]; - FLT zw = 2 * q[2] * q[3]; + FLT zz = 2 * q[3] * q[3]; + FLT zw = 2 * q[3] * q[0]; //opengl major matrix44[0] = 1 - yy - zz; @@ -202,6 +203,40 @@ void quattomatrix(FLT * matrix44, const FLT * qin) matrix44[15] = 1; } + +void quatfrommatrix( FLT * q, const FLT * matrix44 ) +{ + //Algorithm from http://www.euclideanspace.com/maths/geometry/rotations/conversions/matrixToQuaternion/ + float tr = matrix44[0] + matrix44[5] + matrix44[10]; + + if (tr > 0) { + float S = sqrt(tr+1.0) * 2; // S=4*qw + q[0] = 0.25 * S; + q[1] = (matrix44[9] - matrix44[6]) / S; + q[2] = (matrix44[2] - matrix44[8]) / S; + q[3] = (matrix44[4] - matrix44[1]) / S; + } else if ((matrix44[0] > matrix44[5])&(matrix44[0] > matrix44[10])) { + float S = sqrt(1.0 + matrix44[0] - matrix44[5] - matrix44[10]) * 2; // S=4*qx + q[0] = (matrix44[9] - matrix44[6]) / S; + q[1] = 0.25 * S; + q[2] = (matrix44[1] + matrix44[4]) / S; + q[3] = (matrix44[2] + matrix44[8]) / S; + } else if (matrix44[5] > matrix44[10]) { + float S = sqrt(1.0 + matrix44[5] - matrix44[0] - matrix44[10]) * 2; // S=4*qy + q[0] = (matrix44[2] - matrix44[8]) / S; + q[1] = (matrix44[1] + matrix44[4]) / S; + q[2] = 0.25 * S; + q[3] = (matrix44[6] + matrix44[9]) / S; + } else { + float S = sqrt(1.0 + matrix44[10] - matrix44[0] - matrix44[5]) * 2; // S=4*qz + q[0] = (matrix44[4] - matrix44[1]) / S; + q[1] = (matrix44[2] + matrix44[8]) / S; + q[2] = (matrix44[6] + matrix44[9]) / S; + q[3] = 0.25 * S; + } +} + + void quattomatrix33(FLT * matrix33, const FLT * qin) { FLT q[4]; @@ -265,14 +300,9 @@ void quatadd( FLT * qout, const FLT * a, const FLT * b ) qout[3] = a[3] + b[3]; } -void quatrotateabout( FLT * qout, const FLT * a, const FLT * b ) +void quatrotateabout( FLT * qout, const FLT * q1, const FLT * q2 ) { - FLT q1[4]; - FLT q2[4]; - - quatnormalize( q1, a ); - quatnormalize( q2, b ); - + //NOTE: Does not normalize qout[0] = (q1[0]*q2[0])-(q1[1]*q2[1])-(q1[2]*q2[2])-(q1[3]*q2[3]); qout[1] = (q1[0]*q2[1])+(q1[1]*q2[0])+(q1[2]*q2[3])-(q1[3]*q2[2]); qout[2] = (q1[0]*q2[2])-(q1[1]*q2[3])+(q1[2]*q2[0])+(q1[3]*q2[1]); @@ -362,7 +392,7 @@ void quatrotatevector( FLT * vec3out, const FLT * quat, const FLT * vec3in ) vquat[3] = vec3in[2]; quatrotateabout( tquat, quat, vquat ); - quatgetreciprocal( qrecp, quat ); + quatgetconjugate( qrecp, quat ); quatrotateabout( vquat, tquat, qrecp ); vec3out[0] = vquat[1]; @@ -481,3 +511,8 @@ void quatfrom2vectors(FLT *q, const FLT *src, const FLT *dest) } +void matrix44copy(FLT * mout, const FLT * minm ) +{ + memcpy( mout, minm, sizeof( FLT ) * 16 ); +} + diff --git a/redist/linmath.h b/redist/linmath.h index caec281..676d182 100644 --- a/redist/linmath.h +++ b/redist/linmath.h @@ -7,8 +7,8 @@ #define DEFAULT_EPSILON 0.001 //For printf -#define PFTHREE(x) x[0], x[1], x[2] -#define PFFOUR(x) x[0], x[1], x[2], x[3] +#define PFTHREE(x) (x)[0], (x)[1], (x)[2] +#define PFFOUR(x) (x)[0], (x)[1], (x)[2], (x)[3] #define LINMATHPI ((FLT)3.141592653589) @@ -76,6 +76,7 @@ FLT quatmagnitude( const FLT * q ); FLT quatinvsqmagnitude( const FLT * q ); void quatnormalize( FLT * qout, const FLT * qin ); //Safe for in to be same as out. void quattomatrix( FLT * matrix44, const FLT * q ); +void quatfrommatrix( FLT * q, const FLT * matrix44 ); void quatgetconjugate( FLT * qout, const FLT * qin ); void quatgetreciprocal( FLT * qout, const FLT * qin ); void quatsub( FLT * qout, const FLT * a, const FLT * b ); @@ -103,7 +104,7 @@ void rotation_between_vecs_to_m3(Matrix3x3 *m, const FLT v1[3], const FLT v2[3]) Matrix3x3 inverseM33(const Matrix3x3 mat); - +void matrix44copy(FLT * mout, const FLT * minm ); 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