add basic 3d perspective

1 files changed, 30 insertions, 0 deletions

diff --git a/src/glm/camera.c b/src/glm/camera.c
new file mode 100644
index 0000000..7180b77
--- /dev/null
+++ b/src/glm/camera.c
@@ -0,0 +1,30 @@
+#include <lua.h>
+#include <honeysuckle.h>
+#include <cglm/cglm.h>
+#include "util/util.h"
+
+
+int perspective(lua_State *L);
+
+
+void setup_camera(lua_State *L, int glm_tbl)
+{
+	int tbl = hs_create_table(L,
+		hs_str_cfunc("perspective", perspective),
+	);
+
+	append_table(L, glm_tbl, tbl);
+	lua_pop(L, 1);
+}
+
+
+int perspective(lua_State *L)
+{
+	lua_Number fov, aspect, near, far;
+	void *dest_ptr;
+	hs_parse_args(L, hs_num(fov), hs_num(aspect), hs_num(near), hs_num(far), hs_user(dest_ptr));
+	mat4 *dest = dest_ptr;
+
+	glm_perspective(fov, aspect, near, far, *dest);
+	return 0;
+}