Change the behavior of cursor in stereoscopic mode to match the cursor position in the game (--cursor-wrap|--no-cursor-wrap)

2 files changed, 28 insertions, 10 deletions

diff --git a/README.md b/README.md
index 9190793..fc23ec8 100644
--- a/README.md
+++ b/README.md
@@ -42,9 +42,17 @@ killall -USR1 vr-video-player`
 
 You can launch vr-video-player without any arguments to show a list of all arguments:
 ```
-usage: vr-video-player [--flat] [--left-right|--right-left|--plane] [--stretch|--no-stretch] [--zoom zoom-level] [--cursor-scale scale] <window_id>
+usage: vr-video-player [--flat] [--left-right|--right-left|--plane] [--stretch|--no-stretch] [--zoom zoom-level] [--cursor-scale scale] [--cursor-wrap|--no-cursor-wrap] <window_id>
 ```
 
+Note: If the cursor position is weird and does not match what you are seeing in stereoscopic vr mode, then try running the vr video player with the --cursor-wrap option:
+
+--cursor-wrap and --no-cursor-wrap changes the behavior of the cursor in steroscopic mode. Usually in games the game view is mirrored but the cursor is not and the center of the
+game which is normally at the center moves to 1/4 and 3/4 of the window. With --cursor-wrap, the cursor position in VR will match the real position of the
+cursor relative to the window and with --no-cursor-wrap the cursor will match the position of the cursor as the game sees it.
+
+Note: --cursor-scale is set to 0 by default in 180 degrees stereoscopic mode and --no-cursor-wrap is set by default in --flat mode.
+
 # Games
 This vr video player can also be used to play games in VR to to get a 3D effect, and even for games that don't support VR.\
 For games such as Trine that have built-in side-by-side view, you can launch it with proton and there is a launch option for side-by-side view. Select this and when the game launches, get the X11 window id of the game
diff --git a/src/main.cpp b/src/main.cpp
index 4370a24..aa91167 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -314,6 +314,7 @@ private: // X compositor
 	float cursor_scale = 1.0f;
 	ViewMode view_mode = ViewMode::LEFT_RIGHT;
 	bool stretch = true;
+	bool cursor_wrap = true;
 
 	GLuint arrow_image_texture_id = 0;
 	stbi_uc *arrow_image_data = nullptr;
@@ -410,7 +411,7 @@ void dprintf( const char *fmt, ... )
 }
 
 static void usage() {
-	fprintf(stderr, "usage: vr-video-player [--flat] [--left-right|--right-left|--plane] [--stretch|--no-stretch] [--zoom zoom-level] [--cursor-scale scale] <window_id>\n");
+	fprintf(stderr, "usage: vr-video-player [--flat] [--left-right|--right-left|--plane] [--stretch|--no-stretch] [--zoom zoom-level] [--cursor-scale scale] [--cursor-wrap|--no-cursor-wrap] <window_id>\n");
 	exit(1);
 }
 
@@ -453,6 +454,7 @@ CMainApplication::CMainApplication( int argc, char *argv[] )
 	const char *view_mode_arg = nullptr;
 	bool zoom_set = false;
 	bool cursor_scale_set = false;
+	bool cursor_wrap_set = false;
 
 	for(int i = 1; i < argc; ++i) {
 		if(strcmp(argv[i], "--flat") == 0) {
@@ -501,12 +503,17 @@ CMainApplication::CMainApplication( int argc, char *argv[] )
 			stretch = true;
 		} else if(strcmp(argv[i], "--no-stretch") == 0) {
 			stretch = false;
+		} else if(strcmp(argv[i], "--cursor-wrap") == 0) {
+			cursor_wrap = true;
+			cursor_wrap_set = true;
+		} else if(strcmp(argv[i], "--no-cursor-wrap") == 0) {
+			cursor_wrap = false;
+			cursor_wrap_set = true;
 		} else if(argv[i][0] == '-') {
 			fprintf(stderr, "Invalid flag: %s\n", argv[i]);
 			usage();
 		} else {
 			if (strncmp(argv[i], "window:", 7) == 0) {
-				printf("window");
 				argv[i] += 7; // "window:".length
 			}
 			src_window_id = strtol(argv[i], nullptr, 0);
@@ -526,6 +533,10 @@ CMainApplication::CMainApplication( int argc, char *argv[] )
 		cursor_scale = 0.01f;
 	}
 
+	if(!cursor_wrap_set && projection_mode == ProjectionMode::FLAT) {
+		cursor_wrap = false;
+	}
+
 	printf("src window id: %ld, zoom: %f\n", src_window_id, zoom);
 
 	// other initialization tasks are done in BInit
@@ -2027,13 +2038,12 @@ void CMainApplication::RenderScene( vr::Hmd_Eye nEye )
 	m[0] = mouse_x / (float)window_width;
 	m[1] = mouse_y / (float)window_height;
 
-	if(view_mode != ViewMode::PLANE && m[0] >= 0.5f)
-		m[0] -= 0.5f;
-	/*
-	// TODO: Set this as an option?
-	if(view_mode != ViewMode::PLANE)
-		m[0] *= 0.5f;
-	*/
+	if(view_mode != ViewMode::PLANE) {
+		if(cursor_wrap && m[0] >= 0.5f)
+			m[0] -= 0.5f;
+		else if(!cursor_wrap)
+			m[0] *= 0.5f;
+	}
 
 	if( nEye == vr::Eye_Left )
 	{