add first person demo

1 files changed, 16 insertions, 14 deletions

diff --git a/src/glm/mat4.c b/src/glm/mat4.c
index 02ef047..5197891 100644
--- a/src/glm/mat4.c
+++ b/src/glm/mat4.c
@@ -9,8 +9,13 @@ int mat4_set(lua_State *L);
 int mat4_get(lua_State *L);
 int mat4_identity(lua_State *L);
 
+const char *mat4_tname = "glm.mat4";
+
 void setup_mat4(lua_State *L, int glm_tbl)
 {
+	luaL_newmetatable(L, mat4_tname);
+	lua_pop(L, 1);
+
 	int tbl = hs_create_table(L,
 		hs_str_cfunc("mat4", mat4_create),
 		hs_str_cfunc("mat4_set", mat4_set),
@@ -26,37 +31,34 @@ void setup_mat4(lua_State *L, int glm_tbl)
 int mat4_create(lua_State *L)
 {
 	lua_newuserdata(L, 16*sizeof(float));
+	luaL_getmetatable(L, mat4_tname);
+	lua_setmetatable(L, -2);
 	return 1;
 }
 
 
 int mat4_set(lua_State *L)
 {
-	void *ptr;
-	lua_Integer index;
-	lua_Number value;
-	hs_parse_args(L, hs_user(ptr), hs_int(index), hs_num(value));
-	array_set(L, 16, ptr, index, value);
+	float *matrix = luaL_checkudata(L, 1, mat4_tname);
+	int index = luaL_checkinteger(L, 2);
+	float value = luaL_checknumber(L, 3);
+	array_set(L, 16, matrix, index, value);
 	return 0;
 }
 
 
 int mat4_get(lua_State *L)
 {
-	void *ptr;
-	lua_Integer index;
-	hs_parse_args(L, hs_user(ptr), hs_int(index));
-	array_get(L, 16, ptr, index);
+	float *matrix = luaL_checkudata(L, 1, mat4_tname);
+	int index = luaL_checkinteger(L, 2);
+	array_get(L, 16, matrix, index);
 	return 1;
 }
 
 
 int mat4_identity(lua_State *L)
 {
-	void *ptr;
-	hs_parse_args(L, hs_user(ptr));
-	mat4 *m = ptr;
-
-	glm_mat4_identity(*m);
+	void *m = luaL_checkudata(L, 1, mat4_tname);
+	glm_mat4_identity(m);
 	return 0;
 }