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a/util: Add u_device_get_view_pose helper function.

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I saw many, many exact copies of this function in the code: good to de-duplicate them.
This commit is contained in:
Ryan Pavlik 2021-04-26 15:28:12 -05:00 committed by Jakob Bornecrantz
parent 41ad1dcf99
commit 2adbde4673
2 changed files with 44 additions and 2 deletions
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27
src/xrt/auxiliary/util/u_device.c
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@ -1,9 +1,10 @@
// Copyright 2019-2020, Collabora, Ltd.
// Copyright 2019-2021, Collabora, Ltd.
// SPDX-License-Identifier: BSL-1.0
/*!
* @file
* @brief Misc helpers for device drivers.
* @author Jakob Bornecrantz <jakob@collabora.com>
* @author Ryan Pavlik <ryan.pavlik@collabora.com>
* @ingroup aux_util
*/
@ -395,3 +396,27 @@ u_device_setup_tracking_origins(struct xrt_device *head,
apply_offset(&right->tracking_origin->offset.position, global_tracking_origin_offset);
}
}
void
u_device_get_view_pose(const struct xrt_vec3 *eye_relation, uint32_t view_index, struct xrt_pose *out_pose)
{
struct xrt_pose pose = XRT_POSE_IDENTITY;
bool adjust = view_index == 0;
pose.position.x = eye_relation->x / 2.0f;
pose.position.y = eye_relation->y / 2.0f;
pose.position.z = eye_relation->z / 2.0f;
// Adjust for left/right while also making sure there aren't any -0.f.
if (pose.position.x > 0.0f && adjust) {
pose.position.x = -pose.position.x;
}
if (pose.position.y > 0.0f && adjust) {
pose.position.y = -pose.position.y;
}
if (pose.position.z > 0.0f && adjust) {
pose.position.z = -pose.position.z;
}
*out_pose = pose;
}

19
src/xrt/auxiliary/util/u_device.h
View file

@ -1,9 +1,10 @@
// Copyright 2019-2020, Collabora, Ltd.
// Copyright 2019-2021, Collabora, Ltd.
// SPDX-License-Identifier: BSL-1.0
/*!
* @file
* @brief Misc helpers for device drivers.
* @author Jakob Bornecrantz <jakob@collabora.com>
* @author Ryan Pavlik <ryan.pavlik@collabora.com>
* @ingroup aux_util
*/
@ -113,6 +114,22 @@ u_device_setup_tracking_origins(struct xrt_device *head,
struct xrt_device *right,
struct xrt_vec3 *global_tracking_origin_offset);
/*!
* Helper function for `get_view_pose` in an HMD driver.
*
* Takes in a translation from the left to right eye, and returns a center to left or right eye transform that assumes
* the eye relation is symmetrical around the tracked point ("center eye"). Knowing IPD is a subset of this: If you know
* IPD better than the overall Monado system, copy @p eye_relation and put your known IPD in @p real_eye_relation->x
*
* If you have rotation, apply it after calling this function.
*
* @param eye_relation 3D translation from left eye to right eye.
* @param view_index 0 for left, 1 for right.
* @param out_pose The output pose to populate. Will receive translation, with an identity rotation.
*/
void
u_device_get_view_pose(const struct xrt_vec3 *eye_relation, uint32_t view_index, struct xrt_pose *out_pose);
#ifdef __cplusplus
}
#endif