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move frustum related stuff to frustum header

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* create helpers macro which defines corner index
* func for get bounding box frustum
* add missing source to make file
* add more desc to glm_frustum_corners
This commit is contained in:
Recep Aslantas
2018-01-12 15:21:36 +03:00
parent 2b7994778d
commit 2349bbff31
9 changed files with 249 additions and 143 deletions
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112
include/cglm/cam.h
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@@ -541,116 +541,4 @@ glm_persp_sizes(mat4 proj, float fovy, vec4 dest) {
dest[2] = a * dest[3];
}
/*!
* @brief extracts view frustum planes
*
* planes' space:
* 1- if m = proj: View Space
* 2- if m = viewProj: World Space
* 3- if m = MVP: Object Space
*
* You probably want to extract planes in world space so use viewProj as m
* Computing viewProj:
* glm_mat4_mul(proj, view, viewProj);
*
* 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_frustum_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]);
}
/*!
* @brief extracts view frustum corners using clip-space coordinates
*
* corners' space:
* 1- if m = invViewProj: World Space
* 2- if m = invMVP: Object Space
*
* You probably want to extract corners in world space so use invViewProj
* Computing invViewProj:
* glm_mat4_mul(proj, view, viewProj);
* ...
* glm_mat4_inv(viewProj, invViewProj);
*
* @param[in] invMat matrix (see brief)
* @param[out] dest exracted view frustum corners (see brief)
*/
CGLM_INLINE
void
glm_frustum_corners(mat4 invMat, vec4 dest[8]) {
vec4 c[8];
vec4 csCoords[8] = {
{-1.0f, -1.0f, -1.0f, 1.0f},
{-1.0f, 1.0f, -1.0f, 1.0f},
{ 1.0f, -1.0f, -1.0f, 1.0f},
{ 1.0f, 1.0f, -1.0f, 1.0f},
{-1.0f, -1.0f, 1.0f, 1.0f},
{-1.0f, 1.0f, 1.0f, 1.0f},
{ 1.0f, -1.0f, 1.0f, 1.0f},
{ 1.0f, 1.0f, 1.0f, 1.0f}
};
glm_mat4_mulv(invMat, csCoords[0], c[0]);
glm_mat4_mulv(invMat, csCoords[1], c[1]);
glm_mat4_mulv(invMat, csCoords[2], c[2]);
glm_mat4_mulv(invMat, csCoords[3], c[3]);
glm_mat4_mulv(invMat, csCoords[4], c[4]);
glm_mat4_mulv(invMat, csCoords[5], c[5]);
glm_mat4_mulv(invMat, csCoords[6], c[6]);
glm_mat4_mulv(invMat, csCoords[7], c[7]);
glm_vec4_scale(c[1], 1.0f / c[1][3], dest[1]);
glm_vec4_scale(c[2], 1.0f / c[2][3], dest[2]);
glm_vec4_scale(c[3], 1.0f / c[3][3], dest[3]);
glm_vec4_scale(c[4], 1.0f / c[4][3], dest[4]);
glm_vec4_scale(c[5], 1.0f / c[5][3], dest[5]);
glm_vec4_scale(c[6], 1.0f / c[6][3], dest[6]);
glm_vec4_scale(c[7], 1.0f / c[7][3], dest[7]);
}
/*!
* @brief finds center of view frustum
*
* @param[in] corners view frustum corners
* @param[out] dest view frustum center
*/
CGLM_INLINE
void
glm_frustum_center(vec4 corners[8], vec4 dest) {
vec4 center;
glm_vec4_copy(corners[0], center);
glm_vec4_add(corners[1], center, center);
glm_vec4_add(corners[2], center, center);
glm_vec4_add(corners[3], center, center);
glm_vec4_add(corners[4], center, center);
glm_vec4_add(corners[5], center, center);
glm_vec4_add(corners[6], center, center);
glm_vec4_add(corners[7], center, center);
glm_vec4_scale(center, 0.125f, dest);
}
#endif /* cglm_vcam_h */