bazzite/spec_files/gamescope/external-rotation.patch

diff --git a/src/drm.cpp b/src/drm.cpp
index 42c67b9..628bfc9 100644
--- a/src/drm.cpp
+++ b/src/drm.cpp
@@ -521,6 +521,7 @@ bool g_bSupportsSyncObjs = false;
 
 extern gamescope::GamescopeModeGeneration g_eGamescopeModeGeneration;
 extern GamescopePanelOrientation g_DesiredInternalOrientation;
+extern GamescopePanelOrientation g_DesiredExternalOrientation;
 
 extern bool g_bForceDisableColorMgmt;
 
@@ -2008,6 +2009,10 @@ namespace gamescope
 		{
 			m_ChosenOrientation = g_DesiredInternalOrientation;
 		}
+		else if ( this->GetScreenType() == GAMESCOPE_SCREEN_TYPE_EXTERNAL && g_DesiredExternalOrientation != GAMESCOPE_PANEL_ORIENTATION_AUTO )
+		{
+			m_ChosenOrientation = g_DesiredExternalOrientation;
+		}
 		else
 		{
 			if ( this->GetProperties().panel_orientation )
diff --git a/src/main.cpp b/src/main.cpp
index 88c4c7c..2f5fc0a 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -121,6 +121,7 @@ const struct option *gamescope_options = (struct option[]){
 	{ "disable-xres", no_argument, nullptr, 'x' },
 	{ "fade-out-duration", required_argument, nullptr, 0 },
 	{ "force-orientation", required_argument, nullptr, 0 },
+	{ "force-external-orientation", required_argument, nullptr, 0 },
 	{ "force-windows-fullscreen", no_argument, nullptr, 0 },
 
 	{ "disable-color-management", no_argument, nullptr, 0 },
@@ -171,6 +172,7 @@ const char usage[] =
 	"  --xwayland-count               create N xwayland servers\n"
 	"  --prefer-vk-device             prefer Vulkan device for compositing (ex: 1002:7300)\n"
 	"  --force-orientation            rotate the internal display (left, right, normal, upsidedown)\n"
+	"  --force-external-orientation   rotate the external display (left, right, normal, upsidedown)\n"
 	"  --force-windows-fullscreen     force windows inside of gamescope to be the size of the nested display (fullscreen)\n"
 	"  --cursor-scale-height          if specified, sets a base output height to linearly scale the cursor against.\n"
 	"  --hdr-enabled                  enable HDR output (needs Gamescope WSI layer enabled for support from clients)\n"
@@ -267,6 +269,8 @@ bool g_bOutputHDREnabled = false;
 bool g_bFullscreen = false;
 bool g_bForceRelativeMouse = false;
 
+bool g_bExternalForced = false;
+
 bool g_bGrabbed = false;
 
 float g_mouseSensitivity = 1.0;
@@ -353,6 +357,27 @@ static GamescopePanelOrientation force_orientation(const char *str)
 	}
 }
 
+GamescopePanelOrientation g_DesiredExternalOrientation = GAMESCOPE_PANEL_ORIENTATION_AUTO;
+static GamescopePanelOrientation force_external_orientation(const char *str)
+{
+	if (strcmp(str, "normal") == 0) {
+		g_bExternalForced = true;
+		return GAMESCOPE_PANEL_ORIENTATION_0;
+	} else if (strcmp(str, "right") == 0) {
+		g_bExternalForced = true;
+		return GAMESCOPE_PANEL_ORIENTATION_270;
+	} else if (strcmp(str, "left") == 0) {
+		g_bExternalForced = true;
+		return GAMESCOPE_PANEL_ORIENTATION_90;
+	} else if (strcmp(str, "upsidedown") == 0) {
+		g_bExternalForced = true;
+		return GAMESCOPE_PANEL_ORIENTATION_180;
+	} else {
+		fprintf( stderr, "gamescope: invalid value for --force-external-orientation\n" );
+		exit(1);
+	}
+}
+
 static enum GamescopeUpscaleScaler parse_upscaler_scaler(const char *str)
 {
 	if (strcmp(str, "auto") == 0) {
@@ -648,6 +673,8 @@ int main(int argc, char **argv)
 					g_eGamescopeModeGeneration = parse_gamescope_mode_generation( optarg );
 				} else if (strcmp(opt_name, "force-orientation") == 0) {
 					g_DesiredInternalOrientation = force_orientation( optarg );
+				} else if (strcmp(opt_name, "force-external-orientation") == 0) {
+					g_DesiredExternalOrientation = force_external_orientation( optarg );
 				} else if (strcmp(opt_name, "sharpness") == 0 ||
 						   strcmp(opt_name, "fsr-sharpness") == 0) {
 					g_upscaleFilterSharpness = atoi( optarg );
diff --git a/src/main.hpp b/src/main.hpp
index 4e4e9a7..be9a9dd 100644
--- a/src/main.hpp
+++ b/src/main.hpp
@@ -28,6 +28,7 @@ extern bool g_bGrabbed;
 
 extern float g_mouseSensitivity;
 extern const char *g_sOutputName;
+extern bool g_bExternalForced;
 
 enum class GamescopeUpscaleFilter : uint32_t
 {
diff --git a/src/wlserver.cpp b/src/wlserver.cpp
index 9afaab7..b3f9f31 100644
--- a/src/wlserver.cpp
+++ b/src/wlserver.cpp
@@ -2130,6 +2130,32 @@ static void apply_touchscreen_orientation(double *x, double *y )
 			break;
 	}
 
+	// Rotate screen if it's forced with --force-external-orientation
+	if ( g_bExternalForced == true )
+	{
+		switch ( GetBackend()->GetConnector( gamescope::GAMESCOPE_SCREEN_TYPE_EXTERNAL )->GetCurrentOrientation() )
+		{
+			default:
+			case GAMESCOPE_PANEL_ORIENTATION_AUTO:
+			case GAMESCOPE_PANEL_ORIENTATION_0:
+				tx = *x;
+				ty = *y;
+				break;
+			case GAMESCOPE_PANEL_ORIENTATION_90:
+				tx = 1.0 - *y;
+				ty = *x;
+				break;
+			case GAMESCOPE_PANEL_ORIENTATION_180:
+				tx = 1.0 - *x;
+				ty = 1.0 - *y;
+				break;
+			case GAMESCOPE_PANEL_ORIENTATION_270:
+				tx = *y;
+				ty = 1.0 - *x;
+				break;
+		}
+	}
+
 	*x = tx;
 	*y = ty;
 }