#ifndef MATRIXLIB_H
#define MATRIXLIB_H
+#ifndef M_PI
+#define M_PI 3.14159265358979323846 // matches value in gcc v2 math.h
+#endif
+
typedef struct matrix4x4_s
{
float m[4][4];
}
matrix4x4_t;
+extern const matrix4x4_t identitymatrix;
+
// functions for manipulating 4x4 matrices
// copy a matrix4x4
// creates a matrix that does the opposite of the matrix provided
// only supports translate, rotate, scale (not scale3) matrices
void Matrix4x4_Invert_Simple (matrix4x4_t *out, const matrix4x4_t *in1);
+// creates a matrix that does the same rotation and translation as the matrix
+// provided, but no uniform scaling, does not support scale3 matrices
+void Matrix4x4_Normalize (matrix4x4_t *out, matrix4x4_t *in1);
// creates an identity matrix
// (a matrix which does nothing)
// creates a matrix4x4 from a set of 3D vectors for axial directions, and translate
void Matrix4x4_FromVectors(matrix4x4_t *out, const float vx[3], const float vy[3], const float vz[3], const float t[3]);
+// blends two matrices together, at a given percentage (blend controls percentage of in2)
+void Matrix4x4_Blend (matrix4x4_t *out, const matrix4x4_t *in1, const matrix4x4_t *in2, float blend);
+
// transforms a 3D vector through a matrix4x4
void Matrix4x4_Transform (const matrix4x4_t *in, const float v[3], float out[3]);
// transforms a 4D vector through a matrix4x4
// immediately applies a Scale3 to the matrix
void Matrix4x4_ConcatScale3 (matrix4x4_t *out, float x, float y, float z);
+// extracts origin vector (translate) from matrix
+void Matrix4x4_OriginFromMatrix (const matrix4x4_t *in, float *out);
+// extracts scaling factor from matrix (only works for uniform scaling)
+float Matrix4x4_ScaleFromMatrix (const matrix4x4_t *in);
+
#endif