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authorWillian Henrique <wsimanbrazil@yahoo.com.br>2024-08-27 16:53:27 +0100
committerMichael Smith <mikesmiffy128@gmail.com>2024-08-29 23:08:03 +0100
commit455c8b09aaba197476d420e4442f2a5313638259 (patch)
tree261f98b71e8ef899760e27f6943c0c516dc5b6bc
parent98d046645644ff59718a46e2d2bbc6b5f4620b28 (diff)
Add basic server-side tracing functionality
Restricted to L4D for now due to known ABI compatibility issues on other branches. This should be easy to fix later when needed elsewhere. Committer's note: I've counted myself as a joint author and added a copyright notice to the .c file since this code is reasonably modified from the code bill originally wrote last year. but June of this year and , so I've gone ahead and corrected his copyright notice too, with permission.
-rwxr-xr-xcompile1
-rw-r--r--compile.bat1
-rw-r--r--src/trace.c101
-rw-r--r--src/trace.h60
4 files changed, 163 insertions, 0 deletions
diff --git a/compile b/compile
index 17a1ba4..328c08b 100755
--- a/compile
+++ b/compile
@@ -81,6 +81,7 @@ src="\
os.c
portalcolours.c
sst.c
+ trace.c
xhair.c
x86.c"
if [ "$dbg" = 1 ]; then src="$src \
diff --git a/compile.bat b/compile.bat
index ca632ed..a4a6a10 100644
--- a/compile.bat
+++ b/compile.bat
@@ -95,6 +95,7 @@ setlocal DisableDelayedExpansion
:+ portalcolours.c
:+ rinput.c
:+ sst.c
+:+ trace.c
:+ xhair.c
:+ x86.c
:: just tack these on, whatever (repeated condition because of expansion memes)
diff --git a/src/trace.c b/src/trace.c
new file mode 100644
index 0000000..0a301a7
--- /dev/null
+++ b/src/trace.c
@@ -0,0 +1,101 @@
+/*
+ * Copyright © 2023 Willian Henrique <wsimanbrazil@yahoo.com.br>
+ * Copyright © 2024 Michael Smith <mikesmiffy128@gmail.com>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+ * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+ * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+ * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+ * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "engineapi.h"
+#include "errmsg.h"
+#include "feature.h"
+#include "gametype.h"
+#include "intdefs.h"
+#include "trace.h"
+
+FEATURE()
+
+struct ray {
+ // these have type VectorAligned in the engine, which occupies 16 bytes
+ struct vec3f _Alignas(16) start, delta, startoff, extents;
+ // align to 16 since "extents" is supposed to occupy 16 bytes.
+ // TODO(compat): this member isn't in every engine branch
+ const float _Alignas(16) (*worldaxistransform)[3][4];
+ bool isray, isswept;
+};
+
+static void *srvtrace;
+
+DECL_VFUNC(void, TraceRay, 5, struct ray *, uint /*mask*/, void */*filter*/,
+ struct CGameTrace *)
+
+static inline bool nonzero(struct vec3f v) {
+ union { struct vec3f v; struct { unsigned int x, y, z; }; } u = {v};
+ return (u.x | u.y | u.z) << 1 != 0; // ignore sign bit
+}
+
+struct CGameTrace trace_line(struct vec3f start, struct vec3f end, uint mask,
+ void *filt) {
+ struct CGameTrace t;
+ struct vec3f delta = {end.x - start.x, end.y - start.y, end.z - start.z};
+ struct ray r = {
+ .isray = true,
+ .isswept = nonzero(delta),
+ .start = start,
+ .delta = delta
+ };
+ TraceRay(srvtrace, &r, mask, filt, &t);
+ return t;
+}
+
+struct CGameTrace trace_hull(struct vec3f start, struct vec3f end,
+ struct vec3f mins, struct vec3f maxs, uint mask, void *filt) {
+ struct CGameTrace t;
+ struct vec3f delta = {end.x - start.x, end.y - start.y, end.z - start.z};
+ struct vec3f extents = {
+ (maxs.x - mins.x) * 0.5f,
+ (maxs.y - mins.y) * 0.5f,
+ (maxs.z - mins.z) * 0.5f
+ };
+ struct ray r = {
+ // NOTE: could maybe hardcode this to false, but we copy engine logic
+ // just on the off chance we're tracing some insanely thin hull
+ .isray = (extents.x * extents.x + r.extents.y * r.extents.y +
+ extents.z * extents.z) < 1e-6,
+ .isswept = nonzero(delta),
+ .start = start,
+ .delta = delta,
+ .extents = extents,
+ .startoff = {
+ (mins.x + maxs.x) * -0.5f,
+ (mins.y + maxs.y) * -0.5f,
+ (mins.z + maxs.z) * -0.5f
+ }
+ };
+ TraceRay(srvtrace, &r, mask, filt, &t);
+ return t;
+}
+
+PREINIT {
+ // TODO(compat): restricting this to tested branches for now
+ return GAMETYPE_MATCHES(L4D);
+}
+
+INIT {
+ if (!(srvtrace = factory_engine("EngineTraceServer003", 0))) {
+ errmsg_errorx("couldn't get server-side tracing interface");
+ return false;
+ }
+ return true;
+}
+
+// vi: sw=4 ts=4 noet tw=80 cc=80
diff --git a/src/trace.h b/src/trace.h
new file mode 100644
index 0000000..82d2dac
--- /dev/null
+++ b/src/trace.h
@@ -0,0 +1,60 @@
+/*
+ * Copyright © 2023 Willian Henrique <wsimanbrazil@yahoo.com.br>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+ * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+ * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+ * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+ * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef INC_TRACE_H
+#define INC_TRACE_H
+
+#include "intdefs.h"
+#include "engineapi.h"
+
+struct CBaseTrace {
+ struct vec3f startpos, endpos;
+ struct {
+ struct vec3f normal;
+ float dist;
+ u8 type, signbits;
+ //u8 pad[2];
+ } plane; // surface normal at impact
+ float frac;
+ int contents;
+ ushort dispflags;
+ bool allsolid, startsolid;
+};
+
+struct CGameTrace {
+ struct CBaseTrace base;
+ float fracleftsolid;
+ struct {
+ const char *name;
+ short surfprops;
+ ushort flags;
+ } surf;
+ int hitgroup;
+ short physbone;
+ ushort worldsurfidx; // not in every branch, but doesn't break ABI
+ void *ent; // CBaseEntity (C_BaseEntity in client.dll)
+ int hitbox;
+};
+
+struct CGameTrace trace_line(struct vec3f start, struct vec3f end, uint mask,
+ void *filt);
+
+struct CGameTrace trace_hull(struct vec3f start, struct vec3f end,
+ struct vec3f mins, struct vec3f maxs, uint mask, void *filt);
+
+#endif
+
+// vi: sw=4 ts=4 noet tw=80 cc=80