From 7bd1dba1d8370ea3353628198f38531de119e019 Mon Sep 17 00:00:00 2001
From: Jakob Bornecrantz <jakob@collabora.com>
Date: Sun, 20 Jun 2021 16:20:05 +0100
Subject: [PATCH] xrt: Add normalized sub-image offset and size in layer data

This makes the compositor not have to care about texture size.
---
 doc/changes/xrt/mr.847.md            |  2 ++
 src/xrt/include/xrt/xrt_compositor.h |  2 ++
 src/xrt/include/xrt/xrt_defines.h    | 10 ++++++++++
 3 files changed, 14 insertions(+)
 create mode 100644 doc/changes/xrt/mr.847.md

diff --git a/doc/changes/xrt/mr.847.md b/doc/changes/xrt/mr.847.md
new file mode 100644
index 000000000..6f43e0be3
--- /dev/null
+++ b/doc/changes/xrt/mr.847.md
@@ -0,0 +1,2 @@
+Send down sub-image offsets and sizes in normalised form, this makes it so that
+compositor does not need to track the size of swapchains.
diff --git a/src/xrt/include/xrt/xrt_compositor.h b/src/xrt/include/xrt/xrt_compositor.h
index eea69758a..1add40ff2 100644
--- a/src/xrt/include/xrt/xrt_compositor.h
+++ b/src/xrt/include/xrt/xrt_compositor.h
@@ -141,6 +141,8 @@ struct xrt_sub_image
 	uint32_t array_index;
 	//! The rectangle in the image to use
 	struct xrt_rect rect;
+	//! Normalized sub image coordinates and size.
+	struct xrt_normalized_rect norm_rect;
 };
 
 /*!
diff --git a/src/xrt/include/xrt/xrt_defines.h b/src/xrt/include/xrt/xrt_defines.h
index e400fb1a9..2902f6569 100644
--- a/src/xrt/include/xrt/xrt_defines.h
+++ b/src/xrt/include/xrt/xrt_defines.h
@@ -311,6 +311,16 @@ struct xrt_rect
 	struct xrt_size extent;
 };
 
+/*!
+ * Normalized image rectangle, coordinates and size in 0 .. 1 range.
+ *
+ * @ingroup xrt_iface math
+ */
+struct xrt_normalized_rect
+{
+	float x, y, w, h;
+};
+
 /*!
  * A pose composed of a position and orientation.
  *