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move extracting planes to camera header

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* since it related to view frustum / camera it should be in thie header or separate header called frustum.h
* update LICENSE to add authors of algorithm
This commit is contained in:
Recep Aslantas
2017-12-30 13:55:17 +03:00
parent d14627ac52
commit 99669a21a4
7 changed files with 60 additions and 43 deletions
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43
include/cglm/cam.h
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@@ -50,12 +50,14 @@
float * __restrict farVal);
CGLM_INLINE void glm_persp_decomp_far(mat4 proj, float * __restrict farVal);
CGLM_INLINE void glm_persp_decomp_near(mat4 proj, float *__restrict nearVal);
CGLM_INLINE void glm_extract_planes(mat4 m, vec4 dest[6]);
*/
#ifndef cglm_vcam_h
#define cglm_vcam_h
#include "common.h"
#include "plane.h"
/*!
* @brief set up perspective peprojection matrix
@@ -422,4 +424,45 @@ void
glm_persp_decomp_near(mat4 proj, float * __restrict nearVal) {
*nearVal = proj[3][2] / (proj[2][2] - 1);
}
/*!
* @brief extracts view frustum planes
*
* planes' space:
* 1- if m = proj: View Space
* 2- if m = projView: World Space
* 3- if m = MVP: Object Space
*
* You probably want to extract planes in world space so use projView as m
* Computing projView:
* glm_mat4_mul(proj, view, projView);
*
* Exracted planes order: [left, right, bottom, top, near, far]
*
* @param[in] m matrix (see brief)
* @param[out] dest exracted view frustum planes (see brief)
*/
CGLM_INLINE
void
glm_extract_planes(mat4 m, vec4 dest[6]) {
mat4 t;
glm_mat4_transpose_to(m, t);
glm_vec4_add(t[3], t[0], dest[0]); /* left */
glm_vec4_sub(t[3], t[0], dest[1]); /* right */
glm_vec4_add(t[3], t[1], dest[2]); /* bottom */
glm_vec4_sub(t[3], t[1], dest[3]); /* top */
glm_vec4_add(t[3], t[2], dest[4]); /* near */
glm_vec4_sub(t[3], t[2], dest[5]); /* far */
glm_plane_normalize(dest[0]);
glm_plane_normalize(dest[1]);
glm_plane_normalize(dest[2]);
glm_plane_normalize(dest[3]);
glm_plane_normalize(dest[4]);
glm_plane_normalize(dest[5]);
}
#endif /* cglm_vcam_h */