From 1453334863205022b9d8a830cecf3ed01390a3cc Mon Sep 17 00:00:00 2001
From: quou <quou@disroot.org>
Date: Wed, 17 Jul 2024 20:26:29 +1000
Subject: raw mouse input

---
 3de.c    |  1 +
 Makefile |  2 +-
 plat.c   | 70 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 plat.h   |  2 ++
 4 files changed, 72 insertions(+), 3 deletions(-)

diff --git a/3de.c b/3de.c
index 5b5bcc3..23e4d13 100644
--- a/3de.c
+++ b/3de.c
@@ -72,6 +72,7 @@ int entrypoint(int argc, const char** argv, Arena* a) {
 		return error_out_of_memory;
 	}
 	preload_assets(&preload);
+	cfg_mouse(app, 0);
 	while (app->o) {
 		fps_begin(&f);
 		while (f.now >= f.next) {
diff --git a/Makefile b/Makefile
index 55499da..d183d38 100644
--- a/Makefile
+++ b/Makefile
@@ -4,7 +4,7 @@ linker = gcc
 cflags = -I./ -g -DDEBUG -Dplat_x11 -Dplat_x86 \
 -Dplat_posix -Dallocation_default_alignment=8 \
 -Wall -Wextra -pedantic -std=c90
-lflags = -lX11
+lflags = -lX11 -lXi
 int_dir = intermediate
 data_dir = data
 target = 3de
diff --git a/plat.c b/plat.c
index 09c9444..5fbfb19 100644
--- a/plat.c
+++ b/plat.c
@@ -256,6 +256,7 @@ int main(int argc, const char** argv) {
 
 #include <X11/Xlib.h>
 #include <X11/Xutil.h>
+#include <X11/extensions/XInput2.h>
 
 #include <stdlib.h>
 
@@ -264,6 +265,8 @@ typedef struct {
 	Window wi;
 	GC gc;
 	int w, h;
+	int rmx, rmy;
+	int ms;
 	unsigned long begin, end;
 	XImage* bb;
 	Colour* bbp;
@@ -425,8 +428,32 @@ void app_begin(App* a) {
 				i->h = mini(wa.height, max_pc_window_h);
 				break;
 			case MotionNotify:
-				a->mx = e.xmotion.x / a->s;
-				a->my = e.xmotion.y / a->s;
+				if (i->ms) {
+					a->mx = e.xmotion.x / a->s;
+					a->my = e.xmotion.y / a->s;
+				}
+				break;
+			case GenericEvent:
+				if (!i->ms) {
+					if (
+						XGetEventData(d, &e.xcookie) &&
+						e.xcookie.evtype == XI_RawMotion
+					) {
+						XIRawEvent* re = e.xcookie.data;
+						if (re->valuators.mask_len) {
+							const double* values = re->raw_values;
+							if (XIMaskIsSet(re->valuators.mask, 0)) {
+								i->rmx += (int)values[0];
+							}
+							if (XIMaskIsSet(re->valuators.mask, 1)) {
+								i->rmy += (int)values[1];
+							}
+							a->mx = i->rmx / a->s;
+							a->my = i->rmy / a->s;
+						}
+						XFreeEventData(d, &e.xcookie);
+					}
+				}
 				break;
 			default:
 				break;
@@ -496,4 +523,43 @@ void app_end(App* a) {
 	a->fps = 1000000000 / (i->end - i->begin);
 }
 
+void cfg_mouse(App* a, int show) {
+	App_Internal* i = (App_Internal*)(&a[1]);
+	Display* d = i->d;
+	Window w = i->wi;
+	i->ms = show;
+	if (show) {
+		XUndefineCursor(d, w);
+		XUngrabPointer(d, CurrentTime);
+	} else {
+		XColor c;
+		char bd[1] = { 0 };
+		Pixmap b = XCreateBitmapFromData(d, w, bd, 1, 1);
+		Cursor cur = XCreatePixmapCursor(d, b, b, &c, &c, 0, 0);
+		XIEventMask em;
+		unsigned char mask[XIMaskLen(XI_RawMotion)] = { 0 };
+		XDefineCursor(d, w, cur);
+		XGrabPointer(
+			d,
+			w,
+			1,
+			ButtonPressMask |
+			ButtonReleaseMask |
+			PointerMotionMask,
+			GrabModeAsync,
+			GrabModeAsync,
+			w,
+			None,
+			CurrentTime
+		);
+		em.deviceid = XIAllMasterDevices;
+		em.mask_len = sizeof(mask);
+		em.mask = mask;
+		XISetMask(mask, XI_RawMotion);
+		XISelectEvents(d, DefaultRootWindow(d), &em, 1);
+		i->rmx = a->mx;
+		i->rmy = a->my;
+	}
+}
+
 #endif
diff --git a/plat.h b/plat.h
index 419d7fe..a4e2758 100644
--- a/plat.h
+++ b/plat.h
@@ -78,4 +78,6 @@ void deinit_app(App* a);
 void app_begin(App* a);
 void app_end(App* a);
 
+void cfg_mouse(App* a, int show);
+
 #endif
-- 
cgit v1.2.3-54-g00ecf