u_distortion_mesh.h

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// Copyright 2019, Collabora, Ltd.
// SPDX-License-Identifier: BSL-1.0
/*!
 * @file
 * @brief  Code to generate disortion meshes.
 * @author Jakob Bornecrantz <jakob@collabora.com>
 * @author Moshi Turner <moshiturner@protonmail.com>
 * @ingroup aux_distortion
 */
 
#pragma once
 
#include "xrt/xrt_device.h"
#include "xrt/xrt_defines.h"
 
#include "util/u_distortion.h"
 
 
#ifdef __cplusplus
extern "C" {
#endif
 
 
/*
 *
 * Panotools distortion
 *
 */
 
/*!
 * Values to create a distortion mesh from panotools values.
 *
 * @ingroup aux_distortion
 */
struct u_panotools_values
{
        //! Panotools universal distortion k (reverse order from OpenHMD).
        float distortion_k[5];
        //! Panotools post distortion scale, <r, g, b>.
        float aberration_k[3];
        //! Panotools warp scale.
        float scale;
        //! Center of the lens.
        struct xrt_vec2 lens_center;
        //! Viewport size.
        struct xrt_vec2 viewport_size;
};
 
/*!
 * Distortion correction implementation for Panotools distortion values.
 *
 * @ingroup aux_distortion
 */
bool
u_compute_distortion_panotools(struct u_panotools_values *values, float u, float v, struct xrt_uv_triplet *result);
 
 
/*
 *
 * Vive, Vive Pro & Index distortion
 *
 */
 
/*!
 * Values to create a distortion mesh from Vive configuration values.
 *
 * @ingroup aux_distortion
 */
struct u_vive_values
{
        float aspect_x_over_y;
        float grow_for_undistort;
 
        float undistort_r2_cutoff;
 
        //! r/g/b
        struct xrt_vec2 center[3];
 
        //! r/g/b, a/b/c/d
        float coefficients[3][4];
};
 
/*!
 * Distortion correction implementation for the Vive, Vive Pro, Valve Index
 * distortion values found in the HMD configuration.
 *
 * @ingroup aux_distortion
 */
bool
u_compute_distortion_vive(struct u_vive_values *values, float u, float v, struct xrt_uv_triplet *result);
 
 
/*
 *
 * Cardboard mesh distortion parameters.
 *
 */
 
/*!
 * Distortion correction implementation for the Cardboard devices.
 *
 * @ingroup aux_distortion
 */
bool
u_compute_distortion_cardboard(struct u_cardboard_distortion_values *values,
                               float u,
                               float v,
                               struct xrt_uv_triplet *result);
 
 
/*
 *
 * Values for North Star 2D/Polynomial distortion correction.
 *
 */
 
struct u_ns_p2d_values
{
        float x_coefficients_left[16];
        float x_coefficients_right[16];
        float y_coefficients_left[16];
        float y_coefficients_right[16];
        struct xrt_fov fov[2]; // left, right
        float ipd;
};
 
/*!
 * Distortion correction implementation for North Star 2D/Polynomial.
 *
 * @ingroup aux_distortion
 */
bool
u_compute_distortion_ns_p2d(struct u_ns_p2d_values *values, int view, float u, float v, struct xrt_uv_triplet *result);
 
/*
 *
 * Values for Moshi Turner's North Star distortion correction.
 *
 */
struct u_ns_meshgrid_values
{
        int number_of_ipds;
        float *ipds;
        int num_grid_points_u;
        int num_grid_points_v;
        struct xrt_vec2 *grid[2];
        struct xrt_fov fov[2]; // left, right
        float ipd;
};
 
/*!
 * Moshi Turner's North Star distortion correction implementation
 *
 * @ingroup aux_distortion
 */
bool
u_compute_distortion_ns_meshgrid(
    struct u_ns_meshgrid_values *values, int view, float u, float v, struct xrt_uv_triplet *result);
 
 
/*
 *
 * None distortion
 *
 */
 
/*!
 * Identity distortion correction sets all result coordinates to u,v.
 *
 * @ingroup aux_distortion
 */
bool
u_compute_distortion_none(float u, float v, struct xrt_uv_triplet *result);
 
/*!
 * Helper function for none distortion devices.
 *
 * @ingroup aux_distortion
 */
bool
u_distortion_mesh_none(struct xrt_device *xdev, uint32_t view, float u, float v, struct xrt_uv_triplet *result);
 
 
/*
 *
 * Mesh generation functions.
 *
 */
 
/*!
 * Given a @ref xrt_device generates meshes by calling
 * xdev->compute_distortion(), populates `xdev->hmd_parts.distortion.mesh` &
 * `xdev->hmd_parts.distortion.models`.
 *
 * @relatesalso xrt_device
 * @ingroup aux_distortion
 */
void
u_distortion_mesh_fill_in_compute(struct xrt_device *xdev);
 
/*!
 * Given a @ref xrt_device generates a no distortion mesh, populates
 * `xdev->hmd_parts.distortion.mesh` & `xdev->hmd_parts.distortion.models`.
 *
 * @relatesalso xrt_device
 * @ingroup aux_distortion
 */
void
u_distortion_mesh_fill_in_none(struct xrt_device *xdev);
 
/*!
 * Given a @ref xrt_device generates a no distortion mesh, also sets
 * `xdev->compute_distortion()` and populates `xdev->hmd_parts.distortion.mesh`
 * & `xdev->hmd_parts.distortion.models`.
 *
 * @relatesalso xrt_device
 * @ingroup aux_distortion
 */
void
u_distortion_mesh_set_none(struct xrt_device *xdev);
 
 
#ifdef __cplusplus
}
#endif