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decompose perspective near and far values

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This commit is contained in:
Recep Aslantas
2017-11-23 17:16:29 +03:00
parent 39e1c35c79
commit 1907ba1046
1 changed files with 40 additions and 0 deletions
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40
include/cglm/cam.h
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@@ -281,4 +281,44 @@ glm_lookat(vec3 eye,
dest[3][3] = 1.0f; dest[3][3] = 1.0f;
} }
/*!
* @brief decomposes near and far values of perspective projection.
* z stands for z axis (near / far axis)
*
* @param[in] proj perspective projection matrix
* @param[out] near near
* @param[out] far far
*/
CGLM_INLINE
void
glm_persp_decomp_z(mat4 proj,
float * __restrict near,
float * __restrict far) {
*near = proj[3][2] / (proj[3][3] - 1);
*far = proj[3][2] / (proj[3][3] + 1);
}
/*!
* @brief decomposes far value of perspective projection.
*
* @param[in] proj perspective projection matrix
* @param[out] far far
*/
CGLM_INLINE
void
glm_persp_decomp_far(mat4 proj, float * __restrict far) {
*far = proj[3][2] / (proj[3][3] + 1);
}
/*!
* @brief decomposes near value of perspective projection.
*
* @param[in] proj perspective projection matrix
* @param[out] near near
*/
CGLM_INLINE
void
glm_persp_decomp_near(mat4 proj, float * __restrict near) {
*near = proj[3][2] / (proj[3][3] - 1);
}
#endif /* cglm_vcam_h */ #endif /* cglm_vcam_h */