From 983d0be5920f43b281154a167693ceaad86d8da4 Mon Sep 17 00:00:00 2001
From: Matthew Wozniak <me@woz.blue>
Date: Sat, 16 Nov 2024 22:39:29 -0500
Subject: add 5288 support

---
 api.c | 39 ++++++++++++++++++++++-----------------
 1 file changed, 22 insertions(+), 17 deletions(-)

(limited to 'api.c')

diff --git a/api.c b/api.c
index f2be734..5ac08ee 100644
--- a/api.c
+++ b/api.c
@@ -33,6 +33,7 @@ struct audio_device **audio_device = 0;
 struct soundstate *snd = 0;
 void (*snd_recordbuffer)(void) = 0;
 void (*cbuf_addtext)(char *) = 0;
+bool steampipe = false;
 
 // This macro is Copyright 2024 Michael Smith under the same license as above.
 #define NEXT_INSN(p, tgt) do { \
@@ -46,7 +47,8 @@ void (*cbuf_addtext)(char *) = 0;
 
 // TODO: should this be split up?
 
-bool api_init(void) {
+bool api_init(bool _steampipe) {
+	steampipe = _steampipe;
 	void *engine_dll = os_dlhandle("engine");
 	createinterface_func engine_factory =
 		(createinterface_func)os_dlsym(engine_dll, "CreateInterface");
@@ -81,13 +83,13 @@ bool api_init(void) {
 	if (!cbuf_addtext) bail("couldn't find cbuf_addtext");
 
 	// find demoplayer
-	instr = (const u8 *)engclient->vt->is_playing_demo;
+	instr = steampipe ? (const u8 *)engclient->vt->steampipe_is_playing_demo :
+		(const u8 *)engclient->vt->is_playing_demo;
 	// CEngineClient::IsPlayingDemo is a wrapper around a demoplayer call
 	// The first thing it does should be load a ptr to demoplayer into ECX
 	if (instr[0] != X86_MOVRMW || instr[1] != X86_MODRM(0, 1, 5))
 		bail("couldn't get demoplayer");
 	demoplayer = **(struct demoplayer ***)(instr + 2);
-	debug("demoplayer = %p", (void *)demoplayer);
 
 	// find videomode
 	// CEngineAPI::SetEngineWindow calls videomode->SetGameWindow after
@@ -105,7 +107,6 @@ bool api_init(void) {
 		}
 		NEXT_INSN(p, "videomode");
 	}
-	debug("videomode = %p", (void *)videomode);
 
 	// find cl_movieinfo
 	{
@@ -129,7 +130,6 @@ bool api_init(void) {
 		if (instr[0] != X86_ALUMI8 || instr[1] != X86_MODRM(0, 7, 5))
 			bail("couldn't get movieinfo");
 		movieinfo = *(struct movieinfo **)(instr + 2);
-		debug("movieinfo = %p", (void *)movieinfo);
 	}
 	
 	// find SND_RecordBuffer... this is something!
@@ -138,15 +138,22 @@ bool api_init(void) {
 		struct concommand *snd_restart = cvar->vt->find_command(cvar, "snd_restart");
 		instr = (const u8 *)snd_restart->callback;
 		void *s_init = 0;
-		// S_Init is the 3rd call in Snd_Restart_f
+		// S_Init is called after setting snd_firsttime to true. Look for the
+		// second call after the mov
+		bool snd_firsttime_set = false;
 		int call_count = 0;
-		for (const u8 *p = instr; p - instr < 64;) {
-			if (*p == X86_CALL && ++call_count == 3)
+		for (const u8 *p = instr; p - instr < 80;) {
+			// mov byte ptr [snd_firsttime], 1
+			if (p[0] == X86_MOVMI8 && p[1] == 0x05 && p[6] == 1)
+				snd_firsttime_set = true;
+			if (p[0] == X86_CALL && snd_firsttime_set && ++call_count == 2) {
 				s_init = (void *)(p + 5 + *(i32 *)(p + 1));
+				break;
+			}
 			NEXT_INSN(p, "S_Init");
 		}
-		debug("S_Init = %p", (void *)s_init);
-		if (!s_init) bail("couldn't find S_Init");
+		if (!s_init)
+			bail("couldn't find S_Init");
 		// step 2: find g_AudioDevice in S_Init
 		// g_AudioDevice is the first variable assignment after the check for
 		// the -nosound command line arg. look for that.
@@ -162,8 +169,8 @@ bool api_init(void) {
 			}
 			NEXT_INSN(p, "g_AudioDevice");
 		}
-		debug("g_AudioDevice = %p", (void *)audio_device);
-		if (!audio_device) bail("couldn't get ptr to g_AudioDevice");
+		if (!audio_device)
+			bail("couldn't get ptr to g_AudioDevice");
 	}
 	return true;
 }
@@ -172,8 +179,9 @@ bool api_find_snd_recordbuffer(void) {
 	// continuation, we must do this part later
 	// step 3: Find S_TransferStereo16 in CAudioDirectSound::TransferSamples
 	void *transferstereo16 = 0;
-	const u8 *instr = (*audio_device)->vt->transfer_samples;
-	debug("CAudioDirectSound::TransferSamples = %p", (void *)instr);
+	const u8 *instr = steampipe ? 
+		(*audio_device)->vt->steampipe_transfer_samples :
+		(*audio_device)->vt->transfer_samples;
 	// S_TransferStereo16 is the 8th call in TransferSamples
 	int call_count = 0;
 	for (const u8 *p = instr; p - instr < 384 /* big func! */;) {
@@ -183,7 +191,6 @@ bool api_find_snd_recordbuffer(void) {
 	}
 	if (!transferstereo16)
 		bail("couldn't find transferstereo16");
-	debug("S_TransferStereo16 = %p", transferstereo16);
 	// step 4: find SND_RecordBuffer in S_TransferStereo16
 	// it should be the next call after an 'add ecx, ecx'
 	// We are also going to get Snd_WriteLinearBlastStereo16 to get some other
@@ -208,8 +215,6 @@ bool api_find_snd_recordbuffer(void) {
 	}
 	if (!snd_recordbuffer)
 		bail("couldn't find snd_recordbuffer");
-	debug("SND_RecordBuffer = %p", (void *)snd_recordbuffer);
-	debug("Snd_WriteLinearBlastStereo16 + 3 = %p", (void *)snd);
 	return true;
 }
 
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