Allow unbundling OpenXR (for Linux distros)

Copy XrMatrix4x4f_CreateProjectionFov to our OpenXRUtil, instead of relying
on a private header.

1 files changed, 21 insertions, 0 deletions

diff --git a/modules/openxr/openxr_util.h b/modules/openxr/openxr_util.h
index 8ad68c0b02..3f36ab9fca 100644
--- a/modules/openxr/openxr_util.h
+++ b/modules/openxr/openxr_util.h
@@ -44,6 +44,27 @@ public:
 	static String get_action_type_name(XrActionType p_action_type);
 	static String get_environment_blend_mode_name(XrEnvironmentBlendMode p_blend_mode);
 	static String make_xr_version_string(XrVersion p_version);
+
+	// Copied from OpenXR xr_linear.h private header, so we can still link against
+	// system-provided packages without relying on our `thirdparty` code.
+
+	// Column-major, pre-multiplied. This type does not exist in the OpenXR API and is provided for convenience.
+	typedef struct XrMatrix4x4f {
+		float m[16];
+	} XrMatrix4x4f;
+
+	typedef enum GraphicsAPI {
+		GRAPHICS_VULKAN,
+		GRAPHICS_OPENGL,
+		GRAPHICS_OPENGL_ES,
+		GRAPHICS_D3D
+	} GraphicsAPI;
+
+	static void XrMatrix4x4f_CreateProjection(XrMatrix4x4f *result, GraphicsAPI graphicsApi, const float tanAngleLeft,
+			const float tanAngleRight, const float tanAngleUp, float const tanAngleDown,
+			const float nearZ, const float farZ);
+	static void XrMatrix4x4f_CreateProjectionFov(XrMatrix4x4f *result, GraphicsAPI graphicsApi, const XrFovf fov,
+			const float nearZ, const float farZ);
 };
 
 #endif // OPENXR_UTIL_H