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Added function to calculate rotated tangent frame.

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This commit is contained in:
Branimir Karadžić
2016-12-12 23:37:01 -08:00
parent 03e204cb25
commit 466c03d404
1 changed files with 38 additions and 0 deletions
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38
include/bx/fpumath.h
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@@ -341,6 +341,7 @@ namespace bx
_result[2] = 1.0f / _a[2];
}
/// Calculate tangent frame from normal.
inline void vec3TangentFrame(const float* __restrict _n, float* __restrict _t, float* __restrict _b)
{
const float nx = _n[0];
@@ -365,6 +366,24 @@ namespace bx
bx::vec3Cross(_b, _n, _t);
}
/// Calculate tangent frame from normal and angle.
inline void vec3TangentFrame(const float* __restrict _n, float _angle, float* __restrict _t, float* __restrict _b)
{
const float nx = _n[0];
const float ny = _n[1];
const float nz = _n[2];
const float sa = fsin(_angle);
const float ca = fcos(_angle);
const float omca = 1.0f - ca;
_t[0] = omca * nx * nx + ca;
_t[1] = omca * nx * ny - nz * sa;
_t[2] = omca * nx * nz + ny * sa;
bx::vec3Cross(_b, _n, _t);
}
inline void quatIdentity(float* _result)
{
_result[0] = 0.0f;
@@ -574,6 +593,25 @@ namespace bx
_result[15] = 1.0f;
}
inline void mtxFromNormal(float* __restrict _result, const float* __restrict _normal, float _angle, float _scale, const float* __restrict _pos)
{
float tangent[3];
float bitangent[3];
vec3TangentFrame(_normal, _angle, tangent, bitangent);
vec3Mul(&_result[ 0], bitangent, _scale);
vec3Mul(&_result[ 4], _normal, _scale);
vec3Mul(&_result[ 8], tangent, _scale);
_result[ 3] = 0.0f;
_result[ 7] = 0.0f;
_result[11] = 0.0f;
_result[12] = _pos[0];
_result[13] = _pos[1];
_result[14] = _pos[2];
_result[15] = 1.0f;
}
inline void mtxQuat(float* __restrict _result, const float* __restrict _quat)
{
const float x = _quat[0];