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build texture transform matrix helper

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Recep Aslantas
2025-04-05 13:32:47 +03:00
parent ebc65782f8
commit 5fde20d65c
13 changed files with 191 additions and 1 deletions
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29
include/cglm/mat4.h
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@@ -44,6 +44,7 @@
CGLM_INLINE void glm_mat4_swap_row(mat4 mat, int row1, int row2);
CGLM_INLINE float glm_mat4_rmc(vec4 r, mat4 m, vec4 c);
CGLM_INLINE void glm_mat4_make(float * restrict src, mat4 dest);
CGLM_INLINE void glm_mat4_textrans(float sx, float sy, float rot, float tx, float ty, mat4 dest);
*/
#ifndef cglm_mat_h
@@ -799,4 +800,32 @@ glm_mat4_make(const float * __restrict src, mat4 dest) {
dest[2][3] = src[11]; dest[3][3] = src[15];
}
/*!
* @brief Create mat4 matrix from texture transform parameters
*
* @param[in] sx scale x
* @param[in] sy scale y
* @param[in] rot rotation in radians CCW/RH
* @param[in] tx translate x
* @param[in] ty translate y
* @param[out] dest texture transform matrix
*/
CGLM_INLINE
void
glm_mat4_textrans(float sx, float sy, float rot, float tx, float ty, mat4 dest) {
float c, s;
c = cosf(rot);
s = sinf(rot);
glm_mat4_identity(dest);
dest[0][0] = c * sx;
dest[0][1] = -s * sy;
dest[1][0] = s * sx;
dest[1][1] = c * sy;
dest[3][0] = tx;
dest[3][1] = ty;
}
#endif /* cglm_mat_h */