project function
@@ -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 */
