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Diffstat (limited to 'gfx/vr/service/osvr/ClientKit/DisplayC.h')
| -rw-r--r-- | gfx/vr/service/osvr/ClientKit/DisplayC.h | 506 |
1 files changed, 506 insertions, 0 deletions
diff --git a/gfx/vr/service/osvr/ClientKit/DisplayC.h b/gfx/vr/service/osvr/ClientKit/DisplayC.h new file mode 100644 index 0000000000..fb11ca6b53 --- /dev/null +++ b/gfx/vr/service/osvr/ClientKit/DisplayC.h @@ -0,0 +1,506 @@ +/** @file + @brief Header + + Must be c-safe! + + @date 2015 + + @author + Sensics, Inc. + <http://sensics.com/osvr> +*/ + +/* +// Copyright 2015 Sensics, Inc. +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. +*/ + +#ifndef INCLUDED_DisplayC_h_GUID_8658EDC9_32A2_49A2_5F5C_10F67852AE74 +#define INCLUDED_DisplayC_h_GUID_8658EDC9_32A2_49A2_5F5C_10F67852AE74 + +/* Internal Includes */ +#include <osvr/ClientKit/Export.h> +#include <osvr/Util/APIBaseC.h> +#include <osvr/Util/ReturnCodesC.h> +#include <osvr/Util/ClientOpaqueTypesC.h> +#include <osvr/Util/RenderingTypesC.h> +#include <osvr/Util/MatrixConventionsC.h> +#include <osvr/Util/Pose3C.h> +#include <osvr/Util/BoolC.h> +#include <osvr/Util/RadialDistortionParametersC.h> + +/* Library/third-party includes */ +/* none */ + +/* Standard includes */ +/* none */ + +OSVR_EXTERN_C_BEGIN +/** @addtogroup ClientKit + @{ + @name Display API + @{ +*/ + +/** @brief Opaque type of a display configuration. */ +typedef struct OSVR_DisplayConfigObject* OSVR_DisplayConfig; + +/** @brief Allocates a display configuration object populated with data from the + OSVR system. + + Before this call will succeed, your application will need to be correctly + and fully connected to an OSVR server. You may consider putting this call in + a loop alternating with osvrClientUpdate() until this call succeeds. + + Data provided by a display configuration object: + + - The logical display topology (number and relationship of viewers, eyes, + and surfaces), which remains constant throughout the life of the + configuration object. (A method of notification of change here is TBD). + - Pose data for viewers (not required for rendering) and pose/view data for + eyes (used for rendering) which is based on tracker data: if used, these + should be queried every frame. + - Projection matrix data for surfaces, which while in current practice may + be relatively unchanging, we are not guaranteeing them to be constant: + these should be queried every frame. + - Video-input-relative viewport size/location for a surface: would like this + to be variable, but probably not feasible. If you have input, please + comment on the dev mailing list. + - Per-surface distortion strategy priorities/availabilities: constant. Note + the following, though... + - Per-surface distortion strategy parameters: variable, request each frame. + (Could make constant with a notification if needed?) + + Important note: While most of this data is immediately available if you are + successful in getting a display config object, the pose-based data (viewer + pose, eye pose, eye view matrix) needs tracker state, so at least one (and in + practice, typically more) osvrClientUpdate() must be performed before a new + tracker report is available to populate that state. See + osvrClientCheckDisplayStartup() to query if all startup data is available. + + @todo Decide if relative viewport should be constant in a display config, + and update docs accordingly. + + @todo Decide if distortion params should be constant in a display config, + and update docs accordingly. + + @return OSVR_RETURN_FAILURE if invalid parameters were passed or some other + error occurred, in which case the output argument is unmodified. +*/ +OSVR_CLIENTKIT_EXPORT OSVR_ReturnCode +osvrClientGetDisplay(OSVR_ClientContext ctx, OSVR_DisplayConfig* disp); + +/** @brief Frees a display configuration object. The corresponding context must + still be open. + + If you fail to call this, it will be automatically called as part of + clean-up when the corresponding context is closed. + + @return OSVR_RETURN_FAILURE if a null config was passed, or if the given + display object was already freed. +*/ +OSVR_CLIENTKIT_EXPORT OSVR_ReturnCode +osvrClientFreeDisplay(OSVR_DisplayConfig disp); + +/** @brief Checks to see if a display is fully configured and ready, including + having received its first pose update. + + Once this first succeeds, it will continue to succeed for the lifetime of + the display config object, so it is not necessary to keep calling once you + get a successful result. + + @return OSVR_RETURN_FAILURE if a null config was passed, or if the given + display config object was otherwise not ready for full use. +*/ +OSVR_CLIENTKIT_EXPORT OSVR_ReturnCode +osvrClientCheckDisplayStartup(OSVR_DisplayConfig disp); + +/** @brief A display config can have one or more display inputs to pass pixels + over (HDMI/DVI connections, etc): retrieve the number of display inputs in + the current configuration. + + @param disp Display config object. + @param[out] numDisplayInputs Number of display inputs in the logical display + topology, **constant** throughout the active, valid lifetime of a display + config object. + + @sa OSVR_DisplayInputCount + + @return OSVR_RETURN_FAILURE if invalid parameters were passed, in + which case the output argument is unmodified. +*/ +OSVR_CLIENTKIT_EXPORT OSVR_ReturnCode osvrClientGetNumDisplayInputs( + OSVR_DisplayConfig disp, OSVR_DisplayInputCount* numDisplayInputs); + +/** @brief Retrieve the pixel dimensions of a given display input for a display + config + + @param disp Display config object. + @param displayInputIndex The zero-based index of the display input. + @param[out] width Width (in pixels) of the display input. + @param[out] height Height (in pixels) of the display input. + + The out parameters are **constant** throughout the active, valid lifetime of + a display config object. + + @sa OSVR_DisplayDimension + + @return OSVR_RETURN_FAILURE if invalid parameters were passed, in + which case the output arguments are unmodified. +*/ +OSVR_CLIENTKIT_EXPORT OSVR_ReturnCode osvrClientGetDisplayDimensions( + OSVR_DisplayConfig disp, OSVR_DisplayInputCount displayInputIndex, + OSVR_DisplayDimension* width, OSVR_DisplayDimension* height); + +/** @brief A display config can have one (or theoretically more) viewers: + retrieve the viewer count. + + @param disp Display config object. + @param[out] viewers Number of viewers in the logical display topology, + **constant** throughout the active, valid lifetime of a display config + object. + + @sa OSVR_ViewerCount + + @return OSVR_RETURN_FAILURE if invalid parameters were passed, in which case + the output argument is unmodified. +*/ +OSVR_CLIENTKIT_EXPORT OSVR_ReturnCode +osvrClientGetNumViewers(OSVR_DisplayConfig disp, OSVR_ViewerCount* viewers); + +/** @brief Get the pose of a viewer in a display config. + + Note that there may not necessarily be any surfaces rendered from this pose + (it's the unused "center" eye in a stereo configuration, for instance) so + only use this if it makes integration into your engine or existing + applications (not originally designed for stereo) easier. + + Will only succeed if osvrClientCheckDisplayStartup() succeeds. + + @return OSVR_RETURN_FAILURE if invalid parameters were passed or no pose was + yet available, in which case the pose argument is unmodified. +*/ +OSVR_CLIENTKIT_EXPORT OSVR_ReturnCode osvrClientGetViewerPose( + OSVR_DisplayConfig disp, OSVR_ViewerCount viewer, OSVR_Pose3* pose); + +/** @brief Each viewer in a display config can have one or more "eyes" which + have a substantially similar pose: get the count. + + @param disp Display config object. + @param viewer Viewer ID + @param[out] eyes Number of eyes for this viewer in the logical display + topology, **constant** throughout the active, valid lifetime of a display + config object + + @sa OSVR_EyeCount + + @return OSVR_RETURN_FAILURE if invalid parameters were passed, in which case + the output argument is unmodified. +*/ +OSVR_CLIENTKIT_EXPORT OSVR_ReturnCode osvrClientGetNumEyesForViewer( + OSVR_DisplayConfig disp, OSVR_ViewerCount viewer, OSVR_EyeCount* eyes); + +/** @brief Get the "viewpoint" for the given eye of a viewer in a display + config. + + Will only succeed if osvrClientCheckDisplayStartup() succeeds. + + @param disp Display config object + @param viewer Viewer ID + @param eye Eye ID + @param[out] pose Room-space pose (not relative to pose of the viewer) + + @return OSVR_RETURN_FAILURE if invalid parameters were passed or no pose was + yet available, in which case the pose argument is unmodified. +*/ +OSVR_CLIENTKIT_EXPORT OSVR_ReturnCode +osvrClientGetViewerEyePose(OSVR_DisplayConfig disp, OSVR_ViewerCount viewer, + OSVR_EyeCount eye, OSVR_Pose3* pose); + +/** @brief Get the view matrix (inverse of pose) for the given eye of a + viewer in a display config - matrix of **doubles**. + + Will only succeed if osvrClientCheckDisplayStartup() succeeds. + + @param disp Display config object + @param viewer Viewer ID + @param eye Eye ID + @param flags Bitwise OR of matrix convention flags (see @ref MatrixFlags) + @param[out] mat Pass a double[::OSVR_MATRIX_SIZE] to get the transformation + matrix from room space to eye space (not relative to pose of the viewer) + + @return OSVR_RETURN_FAILURE if invalid parameters were passed or no pose was + yet available, in which case the output argument is unmodified. +*/ +OSVR_CLIENTKIT_EXPORT OSVR_ReturnCode osvrClientGetViewerEyeViewMatrixd( + OSVR_DisplayConfig disp, OSVR_ViewerCount viewer, OSVR_EyeCount eye, + OSVR_MatrixConventions flags, double* mat); + +/** @brief Get the view matrix (inverse of pose) for the given eye of a + viewer in a display config - matrix of **floats**. + + Will only succeed if osvrClientCheckDisplayStartup() succeeds. + + @param disp Display config object + @param viewer Viewer ID + @param eye Eye ID + @param flags Bitwise OR of matrix convention flags (see @ref MatrixFlags) + @param[out] mat Pass a float[::OSVR_MATRIX_SIZE] to get the transformation + matrix from room space to eye space (not relative to pose of the viewer) + + @return OSVR_RETURN_FAILURE if invalid parameters were passed or no pose was + yet available, in which case the output argument is unmodified. +*/ +OSVR_CLIENTKIT_EXPORT OSVR_ReturnCode osvrClientGetViewerEyeViewMatrixf( + OSVR_DisplayConfig disp, OSVR_ViewerCount viewer, OSVR_EyeCount eye, + OSVR_MatrixConventions flags, float* mat); + +/** @brief Each eye of each viewer in a display config has one or more surfaces + (aka "screens") on which content should be rendered. + + @param disp Display config object + @param viewer Viewer ID + @param eye Eye ID + @param[out] surfaces Number of surfaces (numbered [0, surfaces - 1]) for the + given viewer and eye. **Constant** throughout the active, valid lifetime of + a display config object. + + @sa OSVR_SurfaceCount + + @return OSVR_RETURN_FAILURE if invalid parameters were passed, in which case + the output argument is unmodified. +*/ +OSVR_CLIENTKIT_EXPORT OSVR_ReturnCode osvrClientGetNumSurfacesForViewerEye( + OSVR_DisplayConfig disp, OSVR_ViewerCount viewer, OSVR_EyeCount eye, + OSVR_SurfaceCount* surfaces); + +/** @brief Get the dimensions/location of the viewport **within the display + input** for a surface seen by an eye of a viewer in a display config. (This + does not include other video inputs that may be on a single virtual desktop, + etc. or explicitly account for display configurations that use multiple + video inputs. It does not necessarily indicate that a viewport in the sense + of glViewport must be created with these parameters, though the parameter + order matches for convenience.) + + @param disp Display config object + @param viewer Viewer ID + @param eye Eye ID + @param surface Surface ID + @param[out] left Output: Distance in pixels from the left of the video input + to the left of the viewport. + @param[out] bottom Output: Distance in pixels from the bottom of the video + input to the bottom of the viewport. + @param[out] width Output: Width of viewport in pixels. + @param[out] height Output: Height of viewport in pixels. + + + @return OSVR_RETURN_FAILURE if invalid parameters were passed, in which case + the output arguments are unmodified. +*/ +OSVR_CLIENTKIT_EXPORT OSVR_ReturnCode +osvrClientGetRelativeViewportForViewerEyeSurface( + OSVR_DisplayConfig disp, OSVR_ViewerCount viewer, OSVR_EyeCount eye, + OSVR_SurfaceCount surface, OSVR_ViewportDimension* left, + OSVR_ViewportDimension* bottom, OSVR_ViewportDimension* width, + OSVR_ViewportDimension* height); + +/** @brief Get the index of the display input for a surface seen by an eye of a + viewer in a display config. + + This is the OSVR-assigned display input: it may not (and in practice, + usually will not) match any platform-specific display indices. This function + exists to associate surfaces with video inputs as enumerated by + osvrClientGetNumDisplayInputs(). + + @param disp Display config object + @param viewer Viewer ID + @param eye Eye ID + @param surface Surface ID + @param[out] displayInput Zero-based index of the display input pixels for + this surface are tranmitted over. + + This association is **constant** throughout the active, valid lifetime of a + display config object. + + @sa osvrClientGetNumDisplayInputs(), + osvrClientGetRelativeViewportForViewerEyeSurface() + + @return OSVR_RETURN_FAILURE if invalid parameters were passed, in which + case the output argument is unmodified. + */ +OSVR_CLIENTKIT_EXPORT OSVR_ReturnCode +osvrClientGetViewerEyeSurfaceDisplayInputIndex( + OSVR_DisplayConfig disp, OSVR_ViewerCount viewer, OSVR_EyeCount eye, + OSVR_SurfaceCount surface, OSVR_DisplayInputCount* displayInput); + +/** @brief Get the projection matrix for a surface seen by an eye of a viewer + in a display config. (double version) + + @param disp Display config object + @param viewer Viewer ID + @param eye Eye ID + @param surface Surface ID + @param near Distance from viewpoint to near clipping plane - must be + positive. + @param far Distance from viewpoint to far clipping plane - must be positive + and not equal to near, typically greater than near. + @param flags Bitwise OR of matrix convention flags (see @ref MatrixFlags) + @param[out] matrix Output projection matrix: supply an array of 16 + (::OSVR_MATRIX_SIZE) doubles. + + @return OSVR_RETURN_FAILURE if invalid parameters were passed, in which case + the output argument is unmodified. +*/ +OSVR_CLIENTKIT_EXPORT OSVR_ReturnCode +osvrClientGetViewerEyeSurfaceProjectionMatrixd( + OSVR_DisplayConfig disp, OSVR_ViewerCount viewer, OSVR_EyeCount eye, + OSVR_SurfaceCount surface, double near, double far, + OSVR_MatrixConventions flags, double* matrix); + +/** @brief Get the projection matrix for a surface seen by an eye of a viewer + in a display config. (float version) + + @param disp Display config object + @param viewer Viewer ID + @param eye Eye ID + @param surface Surface ID + @param near Distance to near clipping plane - must be nonzero, typically + positive. + @param far Distance to far clipping plane - must be nonzero, typically + positive and greater than near. + @param flags Bitwise OR of matrix convention flags (see @ref MatrixFlags) + @param[out] matrix Output projection matrix: supply an array of 16 + (::OSVR_MATRIX_SIZE) floats. + + @return OSVR_RETURN_FAILURE if invalid parameters were passed, in which case + the output argument is unmodified. +*/ +OSVR_CLIENTKIT_EXPORT OSVR_ReturnCode +osvrClientGetViewerEyeSurfaceProjectionMatrixf( + OSVR_DisplayConfig disp, OSVR_ViewerCount viewer, OSVR_EyeCount eye, + OSVR_SurfaceCount surface, float near, float far, + OSVR_MatrixConventions flags, float* matrix); + +/** @brief Get the clipping planes (positions at unit distance) for a surface + seen by an eye of a viewer + in a display config. + + This is only for use in integrations that cannot accept a fully-formulated + projection matrix as returned by + osvrClientGetViewerEyeSurfaceProjectionMatrixf() or + osvrClientGetViewerEyeSurfaceProjectionMatrixd(), and may not necessarily + provide the same optimizations. + + As all the planes are given at unit (1) distance, before passing these + planes to a consuming function in your application/engine, you will typically + divide them by your near clipping plane distance. + + @param disp Display config object + @param viewer Viewer ID + @param eye Eye ID + @param surface Surface ID + @param[out] left Distance to left clipping plane + @param[out] right Distance to right clipping plane + @param[out] bottom Distance to bottom clipping plane + @param[out] top Distance to top clipping plane + + @return OSVR_RETURN_FAILURE if invalid parameters were passed, in which case + the output arguments are unmodified. +*/ +OSVR_CLIENTKIT_EXPORT OSVR_ReturnCode +osvrClientGetViewerEyeSurfaceProjectionClippingPlanes( + OSVR_DisplayConfig disp, OSVR_ViewerCount viewer, OSVR_EyeCount eye, + OSVR_SurfaceCount surface, double* left, double* right, double* bottom, + double* top); + +/** @brief Determines if a surface seen by an eye of a viewer in a display + config requests some distortion to be performed. + + This simply reports true or false, and does not specify which kind of + distortion implementations have been parameterized for this display. For + each distortion implementation your application supports, you'll want to + call the corresponding priority function to find out if it is available. + + @param disp Display config object + @param viewer Viewer ID + @param eye Eye ID + @param surface Surface ID + @param[out] distortionRequested Output parameter: whether distortion is + requested. **Constant** throughout the active, valid lifetime of a display + config object. + + @return OSVR_RETURN_FAILURE if invalid parameters were passed, in which case + the output argument is unmodified. +*/ +OSVR_CLIENTKIT_EXPORT OSVR_ReturnCode +osvrClientDoesViewerEyeSurfaceWantDistortion(OSVR_DisplayConfig disp, + OSVR_ViewerCount viewer, + OSVR_EyeCount eye, + OSVR_SurfaceCount surface, + OSVR_CBool* distortionRequested); + +/** @brief Returns the priority/availability of radial distortion parameters for + a surface seen by an eye of a viewer in a display config. + + If osvrClientDoesViewerEyeSurfaceWantDistortion() reports false, then the + display does not request distortion of any sort, and thus neither this nor + any other distortion strategy priority function will report an "available" + priority. + + @param disp Display config object + @param viewer Viewer ID + @param eye Eye ID + @param surface Surface ID + @param[out] priority Output: the priority level. Negative values + (canonically OSVR_DISTORTION_PRIORITY_UNAVAILABLE) indicate this technique + not available, higher values indicate higher preference for the given + technique based on the device's description. **Constant** throughout the + active, valid lifetime of a display config object. + + @return OSVR_RETURN_FAILURE if invalid parameters were passed, in which case + the output argument is unmodified. +*/ +OSVR_CLIENTKIT_EXPORT OSVR_ReturnCode +osvrClientGetViewerEyeSurfaceRadialDistortionPriority( + OSVR_DisplayConfig disp, OSVR_ViewerCount viewer, OSVR_EyeCount eye, + OSVR_SurfaceCount surface, OSVR_DistortionPriority* priority); + +/** @brief Returns the radial distortion parameters, if known/requested, for a + surface seen by an eye of a viewer in a display config. + + Will only succeed if osvrClientGetViewerEyeSurfaceRadialDistortionPriority() + reports a non-negative priority. + + @param disp Display config object + @param viewer Viewer ID + @param eye Eye ID + @param surface Surface ID + @param[out] params Output: the parameters for radial distortion + + @return OSVR_RETURN_FAILURE if this surface does not have these parameters + described, or if invalid parameters were passed, in which case the output + argument is unmodified. +*/ +OSVR_CLIENTKIT_EXPORT OSVR_ReturnCode +osvrClientGetViewerEyeSurfaceRadialDistortion( + OSVR_DisplayConfig disp, OSVR_ViewerCount viewer, OSVR_EyeCount eye, + OSVR_SurfaceCount surface, OSVR_RadialDistortionParameters* params); + +/** @} + @} +*/ + +OSVR_EXTERN_C_END + +#endif |