trimesh_desc_concat

src/luaapi.c

@@ -2287,6 +2287,67 @@ static int dagame_net_punch(lua_State *L) {
 	return 0;
 }
 
+static int dagame_mdl_desc_append(lua_State *L) {
+	float offsetX = lua_tonumber(L, 3);
+	float offsetY = lua_tonumber(L, 4);
+	float offsetZ = lua_tonumber(L, 5);
+	
+	lua_getfield(L, 1, "positions");
+	lua_getfield(L, 2, "positions");
+	
+		lua_len(L, -2);
+		lua_len(L, -2);
+			size_t bigPositions = lua_tointeger(L, -2);
+			size_t smallPositions = lua_tointeger(L, -1);
+		lua_pop(L, 2);
+		
+		for(size_t i = 1; i <= smallPositions; i += 3) {
+			lua_rawgeti(L, -1, i + 0);
+			lua_rawgeti(L, -2, i + 1);
+			lua_rawgeti(L, -3, i + 2);
+				float posX = lua_tonumber(L, -3) + offsetX;
+				float posY = lua_tonumber(L, -2) + offsetY;
+				float posZ = lua_tonumber(L, -1) + offsetZ;
+			lua_pop(L, 3);
+			
+			lua_pushnumber(L, posX);
+			lua_rawseti(L, -3, bigPositions + i + 0);
+			
+			lua_pushnumber(L, posY);
+			lua_rawseti(L, -3, bigPositions + i + 1);
+			
+			lua_pushnumber(L, posZ);
+			lua_rawseti(L, -3, bigPositions + i + 2);
+		}
+	
+	lua_pop(L, 2);
+	
+	lua_getfield(L, 1, "indices");
+	lua_getfield(L, 2, "indices");
+		
+		lua_len(L, -1);
+			size_t smallIndices = lua_tointeger(L, -1);
+		lua_pop(L, 1);
+		
+		lua_len(L, -2);
+			size_t bigIndices = lua_tointeger(L, -1);
+		lua_pop(L, 1);
+		
+		bigPositions /= 3;
+		
+		for(size_t i = 1; i <= smallIndices; i++) {
+			lua_rawgeti(L, -1, i);
+				size_t j = lua_tointeger(L, -1);
+			lua_pop(L, 1);
+			lua_pushinteger(L, j + bigPositions);
+			lua_rawseti(L, -3, ++bigIndices);
+		}
+	
+	lua_pop(L, 2);
+	
+	return 0;
+}
+
 #include<GLFW/glfw3.h>
 static int os_time(lua_State *L) {
 	lua_pushnumber(L, glfwGetTime() - LuaapiStartTime);
@@ -2408,6 +2469,9 @@ void luaapi_init() {
 		lua_pushcfunction(L, dagame_mdl);
 		lua_setfield(L, -2, "mdl");
 		
+		lua_pushcfunction(L, dagame_mdl_desc_append);
+		lua_setfield(L, -2, "trimesh_desc_concat");
+		
 		lua_pushcfunction(L, dagame_trimesh);
 		lua_setfield(L, -2, "trimesh");