[video output=day021 member=cmuratori stream_platform=twitch stream_username=handmade_hero project=code template=code021_template.html title="Loading Game Code Dynamically" vod_platform=youtube id=WMSBRk5WG58 annotator=schme annotator=Kelimion]
[1:29][Intro to the episode]
[3:06][About implementing and using a scripting languages]
[6:15][Benefits of loading game code dynamically]
[8:29][Starting on dynamic code loading]
[11:38][Separating platform and game code to different translation units]
[15:56][Getting functions from game dll to the platform executable]
[24:29][Getting Functions from platform executable to the game dll]
[31:00][Searching compiler flags for building a dll]
[35:18][Dll main]
[40:08][Exporting functions from a dll]
[47:27][Loading and unloading the game dll on the fly]
[50:17][Moving local persist variables from the dll to game_state]
[52:31][Avoid locking the dll to allow rewriting]
[1:02:00][Episode recap]
[1:03:37][Q&A][:speech]
[1:03:51][-LD to build a dll and removing incremental building]
[1:06:23][Question: We have small code right now. How does dynamic linking and compiling to an exe work with huge games that are multiple gigs?]
[1:07:39][Casey spoils tomorrows stream by telling people not to spoil it]
[1:08:00][Short recap on loops]
[1:10:28][Question: Do you recommend playing around with dll files, or are they mainly used in specific cases?]
[1:11:05][Question: Can someone now create a dummy handmade.dll and use it to intercept the GameUpdateAndRender function to get a pointer to game memory and change stuff. Is security something you will cover in a later stream?]
[1:13:34][Question: We've got a tiny application right now so if code takes minutes to compile, how are we going to do what we just did?]
[1:16:08][Question: Would you be able to load the dll yourself using ReadFile() and implement getProcAddress() as well, assuming there's an easy way to make the memory executable like mmap()]
[1:18:16][Question: Is this technique still possible without using passing of the large memory blob between the dll and the exe?]
[1:21:00][Question: Does the dll prevent the compiler from inlining?]
[1:21:47][Question: How are we going to implement dll's on Linux/Mac?]
[1:23:02][Question: Are you ever going to write the platform layers for other platforms on the stream in the far future?]
[1:24:02][Question: Is the process roughly the same for doing the Linux equivalent of sharing libraries?]
[1:25:42][Question: Your #define typedef magic kinda bugs me, in that it hides the arguments/return type away from the implementation. How much of a win is having the signature in one place?]
[1:26:54][Question: How does Windows manage memory in a dll? Is there a dll process page? Where are variables made/the statics stored? How is heap managed when allocated from a dll?]
[1:37:14][Question: Doesn't Windows know \[who called it\] by the instruction pointers leading up to the VirtualAlloc() call?]
[/video]