From: divverent <divverent@d7cf8633-e32d-0410-b094-e92efae38249>
Date: Fri, 29 Apr 2011 20:32:35 +0000 (+0000)
Subject: CL_RotateMoves: helper builtin for Xonotic for perfect warpzone prediction
X-Git-Tag: xonotic-v0.6.0~163^2~462
X-Git-Url: http://de.git.xonotic.org/?p=xonotic%2Fdarkplaces.git;a=commitdiff_plain;h=7c9b33c2b122a788bb81c3e1dd0bb172f9cdc706;ds=sidebyside

CL_RotateMoves: helper builtin for Xonotic for perfect warpzone prediction

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@11084 d7cf8633-e32d-0410-b094-e92efae38249
---

diff --git a/cl_input.c b/cl_input.c
index 1a0704d7..577df505 100644
--- a/cl_input.c
+++ b/cl_input.c
@@ -1697,6 +1697,25 @@ void CL_NewFrameReceived(int num)
 	cl.latestframenumsposition = (cl.latestframenumsposition + 1) % LATESTFRAMENUMS;
 }
 
+void CL_RotateMoves(const matrix4x4_t *m)
+{
+	// rotate viewangles in all previous moves
+	vec3_t v;
+	vec3_t f, r, u;
+	int i;
+	for (i = 0;i < CL_MAX_USERCMDS;i++)
+	{
+		if (cl.movecmd[i].sequence > cls.servermovesequence)
+		{
+			usercmd_t *c = &cl.movecmd[i];
+			AngleVectors(c->viewangles, f, r, u);
+			Matrix4x4_Transform(m, f, v); VectorCopy(v, f);
+			Matrix4x4_Transform(m, u, v); VectorCopy(v, u);
+			AnglesFromVectors(c->viewangles, f, u, false);
+		}
+	}
+}
+
 /*
 ==============
 CL_SendMove
diff --git a/client.h b/client.h
index af413434..11f9aa17 100644
--- a/client.h
+++ b/client.h
@@ -1836,5 +1836,8 @@ r_refdef_t;
 
 extern r_refdef_t r_refdef;
 
+// warpzone prediction hack (CSQC builtin)
+void CL_RotateMoves(const matrix4x4_t *m);
+
 #endif
 
diff --git a/clvm_cmds.c b/clvm_cmds.c
index 2beea3ce..ffcff83f 100644
--- a/clvm_cmds.c
+++ b/clvm_cmds.c
@@ -3990,6 +3990,44 @@ static void VM_CL_frameduration(void)
 		PRVM_G_FLOAT(OFS_RETURN) = model->animscenes[framenum].framecount / model->animscenes[framenum].framerate;
 }
 
+void VM_CL_RotateMoves(void)
+{
+	/*
+	 * Obscure builtin used by GAME_XONOTIC.
+	 *
+	 * Edits the input history of cl_movement by rotating all move commands
+	 * currently in the queue using the given transform.
+	 *
+	 * The vector passed is an "angles transform" as used by warpzonelib, i.e.
+	 * v_angle-like (non-inverted) euler angles that perform the rotation
+	 * of the space that is to be done.
+	 *
+	 * This is meant to be used as a fixangle replacement after passing
+	 * through a warpzone/portal: the client is told about the warp transform,
+	 * and calls this function in the same frame as the one on which the
+	 * client's origin got changed by the serverside teleport. Then this code
+	 * transforms the pre-warp input (which matches the empty space behind
+	 * the warp plane) into post-warp input (which matches the target area
+	 * of the warp). Also, at the same time, the client has to use
+	 * R_SetView to adjust VF_CL_VIEWANGLES according to the same transform.
+	 *
+	 * This together allows warpzone motion to be perfectly predicted by
+	 * the client!
+	 *
+	 * Furthermore, for perfect warpzone behaviour, the server side also
+	 * has to detect input the client sent before it received the origin
+	 * update, but after the warp occurred on the server, and has to adjust
+	 * input appropriately.
+	 */
+	matrix4x4_t m;
+	vec3_t v = {0, 0, 0};
+	vec3_t x, y, z;
+	VM_SAFEPARMCOUNT(1, VM_CL_RotateMoves);
+	AngleVectorsFLU(PRVM_G_VECTOR(OFS_PARM0), x, y, z);
+	Matrix4x4_FromVectors(&m, x, y, z, v);
+	CL_RotateMoves(&m);
+}
+
 //============================================================================
 
 // To create a almost working builtin file from this replace:
@@ -4638,6 +4676,12 @@ VM_setkeybind,						// #630 float(float key, string bind[, float bindmap]) setke
 VM_getbindmaps,						// #631 vector(void) getbindmap
 VM_setbindmaps,						// #632 float(vector bm) setbindmap
 NULL,							// #633
+NULL,							// #634
+NULL,							// #635
+NULL,							// #636
+NULL,							// #637
+VM_CL_RotateMoves,					// #638
+NULL,							// #639
 };
 
 const int vm_cl_numbuiltins = sizeof(vm_cl_builtins) / sizeof(prvm_builtin_t);
diff --git a/svvm_cmds.c b/svvm_cmds.c
index fc35514d..0efb61bf 100644
--- a/svvm_cmds.c
+++ b/svvm_cmds.c
@@ -27,6 +27,7 @@ const char *vm_sv_extensions =
 "DP_CSQC_BOXPARTICLES "
 "DP_CSQC_SPAWNPARTICLE "
 "DP_CSQC_QUERYRENDERENTITY "
+"DP_CSQC_ROTATEMOVES "
 "DP_CSQC_SETPAUSE "
 "DP_EF_ADDITIVE "
 "DP_EF_BLUE "