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mat4: helper for row * matrix * column

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This commit is contained in:
Recep Aslantas
2019-01-26 18:05:05 +03:00
parent 807d5589b4
commit 32ddf49756
5 changed files with 59 additions and 5 deletions
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4
include/cglm/call/mat4.h
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@@ -113,6 +113,10 @@ CGLM_EXPORT
void
glmc_mat4_swap_row(mat4 mat, int row1, int row2);
CGLM_EXPORT
float
glmc_mat4_rmc(vec4 r, mat4 m, vec4 c);
#ifdef __cplusplus
}
#endif

22
include/cglm/mat4.h
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@@ -677,4 +677,26 @@ glm_mat4_swap_row(mat4 mat, int row1, int row2) {
mat[3][row2] = tmp[3];
}
/*!
* @brief helper for R (row vector) * M (matrix) * C (column vector)
*
* rmc stands for Row * Matrix * Column
*
* the result is scalar because S * M = Matrix1x4 (row vector),
* then Matrix1x4 * Vec4 (column vector) = Matrix1x1 (Scalar)
*
* @param[in] r row vector or matrix1x4
* @param[in] m matrix4x4
* @param[in] c column vector or matrix4x1
*
* @return scalar value e.g. B(s)
*/
CGLM_INLINE
float
glm_mat4_rmc(vec4 r, mat4 m, vec4 c) {
vec4 tmp;
glm_mat4_mulv(m, r, tmp);
return glm_vec4_dot(c, tmp);
}
#endif /* cglm_mat_h */