add unproject function

include/cglm/call/project.h

@@ -0,0 +1,29 @@
+/*
+ * Copyright (c), Recep Aslantas.
+ *
+ * MIT License (MIT), http://opensource.org/licenses/MIT
+ * Full license can be found in the LICENSE file
+ */
+
+#ifndef cglmc_project_h
+#define cglmc_project_h
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "../cglm.h"
+
+CGLM_EXPORT
+void
+glmc_unprojecti(mat4 invMat, vec4 vp, vec3 coord, vec3 dest);
+
+CGLM_EXPORT
+void
+glmc_unproject(mat4 m, vec2 vp, vec3 coord, vec3 dest);
+
+#ifdef __cplusplus
+}
+#endif
+#endif /* cglmc_project_h */
+
+