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project function

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Recep Aslantas
2018-04-03 11:09:13 +03:00
parent 3399595dc2
commit 9f389ab8ec
1 changed files with 23 additions and 0 deletions
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23
include/cglm/project.h
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@@ -84,4 +84,27 @@ glm_unproject(mat4 m, vec4 vp, vec3 coord, vec4 dest) {
glm_unprojecti(inv, vp, coord, dest);
}
/*!
* @brief map object coordinates to window coordinates
*
* @param[in] pos object coordinates
* @param[in] m MVP matrix
* @param[in] vp viewport as [x, y, width, height]
* @param[out] dest projected coordinates
*/
CGLM_INLINE
void
glm_project(vec3 pos, mat4 m, vec4 vp, vec3 dest) {
vec4 pos4;
glm_vec4(pos, 1.0f, pos4);
glm_mat4_mulv(m, pos4, pos4);
glm_vec4_scale(pos4, 1.0f / pos4[3], pos4); /* pos = pos / pos.w */
dest[0] = (pos4[0] + 1.0f) * 0.5f * vp[2] + vp[0];
dest[1] = (pos4[1] + 1.0f) * 0.5f * vp[3] + vp[1];
dest[2] = (pos4[2] + 1.0f) * 0.5f;
}
#endif /* cglm_project_h */