SRM  v0.11.0-1
Simple Rendering Manager
SRMConnector

Display with associated rendering capabilities and modes. More...

Detailed Description

Display with associated rendering capabilities and modes.

An SRMConnector represents a screen where content is displayed, such as a laptop display, an HDMI monitor, and more.

Rendering

Each connector has its own dedicated rendering thread, which triggers common OpenGL events like initializeGL(), paintGL(), resizeGL() through an SRMConnectorInterface. You can initialize a connector using the srmConnectorInitialize() method.

Modes

Connectors usually support multiple display modes (SRMConnectorMode), which define their refresh rate and resolution.
These modes can be enumerated using srmConnectorGetModes() and selected using srmConnectorSetMode().

Enumerations

enum  SRM_PRESENTATION_TIME_FLAGS
 Bitmask of flags in an fb presentation. More...
 
enum  SRM_CONNECTOR_STATE
 Enumeration of connector states. More...
 
enum  SRM_CONNECTOR_SUBPIXEL
 Enumeration of connector subpixel layouts. More...
 
enum  SRM_CONNECTOR_CONTENT_TYPE
 Content type hint. More...
 

Functions

void srmConnectorSetUserData (SRMConnector *connector, void *userData)
 Sets the connector user data. More...
 
void * srmConnectorGetUserData (SRMConnector *connector)
 Retrieves the connector user data. More...
 
SRMDevicesrmConnectorGetDevice (SRMConnector *connector)
 Get the device this connector belongs to. More...
 
SRMDevicesrmConnectorGetRendererDevice (SRMConnector *connector)
 Retrieve the renderer device associated with the connector. More...
 
UInt32 srmConnectorGetID (SRMConnector *connector)
 Get the DRM connector ID. More...
 
SRM_CONNECTOR_STATE srmConnectorGetState (SRMConnector *connector)
 Get the current state of the connector. More...
 
UInt8 srmConnectorIsConnected (SRMConnector *connector)
 Check if the connector is connected. More...
 
UInt32 srmConnectorGetmmWidth (SRMConnector *connector)
 Get the physical width of the connector in millimeters. More...
 
UInt32 srmConnectorGetmmHeight (SRMConnector *connector)
 Get the physical height of the connector in millimeters. More...
 
UInt32 srmConnectorGetType (SRMConnector *connector)
 Get the DRM type of the connector. More...
 
const char * srmConnectorGetName (SRMConnector *connector)
 Get the name of the connector. More...
 
const char * srmConnectorGetManufacturer (SRMConnector *connector)
 Get the manufacturer of the connected display. More...
 
const char * srmConnectorGetModel (SRMConnector *connector)
 Get the model of the connected display. More...
 
const char * srmConnectorGetSerial (SRMConnector *connector)
 Get the serial number of the connected display. More...
 
SRMListsrmConnectorGetEncoders (SRMConnector *connector)
 Get a list of available connector encoders. More...
 
SRMListsrmConnectorGetModes (SRMConnector *connector)
 Get a list of available connector modes. More...
 
UInt8 srmConnectorHasHardwareCursor (SRMConnector *connector)
 Check if there is an available cursor plane for hardware cursor compositing. More...
 
UInt8 srmConnectorSetCursor (SRMConnector *connector, UInt8 *pixels)
 Set the pixels of the hardware cursor. More...
 
UInt8 srmConnectorSetCursorPos (SRMConnector *connector, Int32 x, Int32 y)
 Set the position of the hardware cursor relative to the connector's top-left origin. More...
 
SRMEncodersrmConnectorGetCurrentEncoder (SRMConnector *connector)
 Get the currently used encoder for the connector. More...
 
SRMCrtcsrmConnectorGetCurrentCrtc (SRMConnector *connector)
 Get the currently used CRT controller (CRTC) for the connector. More...
 
SRMPlanesrmConnectorGetCurrentPrimaryPlane (SRMConnector *connector)
 Get the currently used primary plane for the connector. More...
 
SRMPlanesrmConnectorGetCurrentCursorPlane (SRMConnector *connector)
 Get the currently used cursor plane for the connector. More...
 
SRMConnectorModesrmConnectorGetPreferredMode (SRMConnector *connector)
 Get the preferred connector mode. More...
 
SRMConnectorModesrmConnectorGetCurrentMode (SRMConnector *connector)
 Get the current connector mode. More...
 
UInt8 srmConnectorSetMode (SRMConnector *connector, SRMConnectorMode *mode)
 Sets the current mode of the connector. More...
 
UInt8 srmConnectorInitialize (SRMConnector *connector, SRMConnectorInterface *interface, void *userData)
 Initializes a connector, creating its rendering thread and invoking initializeGL() once initialized. More...
 
UInt8 srmConnectorRepaint (SRMConnector *connector)
 Schedules a new rendering frame. More...
 
void srmConnectorUninitialize (SRMConnector *connector)
 Uninitializes the connector. More...
 
UInt8 srmConnectorSuspend (SRMConnector *connector)
 Locks the rendering thread until srmConnectorResume() is called. More...
 
UInt8 srmConnectorResume (SRMConnector *connector)
 Unlocks the rendering thread if previously locked with srmConnectorSuspend(). More...
 
UInt32 srmConnectorGetFramebufferID (SRMConnector *connector)
 Retrieves the ID of the currently bound OpenGL framebuffer. More...
 
EGLContext srmConnectorGetContext (SRMConnector *connector)
 Retrieves the EGLContext associated with the rendering thread. More...
 
UInt32 srmConnectorGetCurrentBufferAge (SRMConnector *connector)
 Retrieves the age of the current buffer. More...
 
UInt32 srmConnectorGetCurrentBufferIndex (SRMConnector *connector)
 Returns the current framebuffer index. More...
 
UInt32 srmConnectorGetBuffersCount (SRMConnector *connector)
 Returns the number of framebuffers. More...
 
SRMBuffersrmConnectorGetBuffer (SRMConnector *connector, UInt32 bufferIndex)
 Returns the buffer of a specific framebuffer index, usable as a texture for rendering. More...
 
UInt8 srmConnectorHasBufferDamageSupport (SRMConnector *connector)
 Checks if the connector benefits from providing it damage information generated during the last paintGL() call. More...
 
UInt8 srmConnectorSetBufferDamage (SRMConnector *connector, SRMRect *rects, Int32 n)
 Notifies the connector of new damage generated during the last paintGL() call. More...
 
UInt8 srmConnectorSetBufferDamageBoxes (SRMConnector *connector, SRMBox *boxes, Int32 n)
 Notifies the connector of new damage generated during the last paintGL() call using boxes. More...
 
SRM_CONNECTOR_SUBPIXEL srmConnectorGetSubPixel (SRMConnector *connector)
 Get the subpixel layout associated with a connector. More...
 
UInt64 srmConnectorGetGammaSize (SRMConnector *connector)
 Gets the number of elements used to represent each RGB gamma correction curve. More...
 
UInt8 srmConnectorSetGamma (SRMConnector *connector, UInt16 *table)
 Sets the gamma correction curves for each RGB component. More...
 
UInt8 srmConnectorHasVSyncControlSupport (SRMConnector *connector)
 Checks if the driver supports the ability to turn off vsync. More...
 
UInt8 srmConnectorIsVSyncEnabled (SRMConnector *connector)
 Returns the current vsync status. More...
 
UInt8 srmConnectorEnableVSync (SRMConnector *connector, UInt8 enabled)
 Enable or disable vsync. More...
 
void srmConnectorSetRefreshRateLimit (SRMConnector *connector, Int32 hz)
 Sets the refresh rate limit when vsync is disabled. More...
 
Int32 srmConnectorGetRefreshRateLimit (SRMConnector *connector)
 Retrieves the current refresh rate limit when vsync is disabled. More...
 
clockid_t srmConnectorGetPresentationClock (SRMConnector *connector)
 Gets the clock ID used for the timestamps returned by srmConnectorGetPresentationTime(). More...
 
const SRMPresentationTimesrmConnectorGetPresentationTime (SRMConnector *connector)
 Retrieves information about how and when the current framebuffer displayed on the screen was presented. More...
 
void srmConnectorSetContentType (SRMConnector *connector, SRM_CONNECTOR_CONTENT_TYPE contentType)
 Sets a hint of the content type being displayed. More...
 
SRM_CONNECTOR_CONTENT_TYPE srmConnectorGetContentType (SRMConnector *connector)
 Gets the content type hint. More...
 
UInt8 srmConnectorSetCustomScanoutBuffer (SRMConnector *connector, SRMBuffer *buffer)
 Sets a custom scanout buffer for the primary plane. More...
 
UInt8 srmConnectorIsNonDesktop (SRMConnector *connector)
 Checks if the connector is not intended for desktop usage. More...
 

Typedef Documentation

◆ SRMConnector

typedef struct SRMConnectorStruct SRMConnector

Enumeration Type Documentation

◆ SRM_PRESENTATION_TIME_FLAGS

Bitmask of flags in an fb presentation.

These flags provide information about how the last framebuffer was presented on a connector display.

See also
SRMPresentationTime
Enumerator
SRM_PRESENTATION_TIME_FLAGS_VSYNC 

Presentation was vsync'd.

SRM_PRESENTATION_TIME_FLAGS_HW_CLOCK 

Hardware provided the presentation timestamp.

SRM_PRESENTATION_TIME_FLAGS_HW_COMPLETION 

Hardware signaled the start of the presentation.

◆ SRM_CONNECTOR_STATE

Enumeration of connector states.

Enumerator
SRM_CONNECTOR_STATE_UNINITIALIZED 

The connector is uninitialized.

SRM_CONNECTOR_STATE_INITIALIZED 

The connector is initialized.

SRM_CONNECTOR_STATE_UNINITIALIZING 

The connector is in the process of uninitializing.

SRM_CONNECTOR_STATE_INITIALIZING 

The connector is in the process of initializing.

SRM_CONNECTOR_STATE_CHANGING_MODE 

The connector is changing display mode.

SRM_CONNECTOR_STATE_REVERTING_MODE 

Special case when changing mode fails and reverts to its previous mode.

SRM_CONNECTOR_STATE_SUSPENDING 

The connector state is changing from initialized to suspended.

SRM_CONNECTOR_STATE_SUSPENDED 

The connector is suspended.

SRM_CONNECTOR_STATE_RESUMING 

The connector state is changing from suspended to initialized.

◆ SRM_CONNECTOR_SUBPIXEL

Enumeration of connector subpixel layouts.

This enumeration defines different subpixel layouts that can be associated with a connector. Subpixels are individual color elements that make up a pixel on a display. Understanding the subpixel layout is crucial for accurate color interpretation and display.

Enumerator
SRM_CONNECTOR_SUBPIXEL_UNKNOWN 

Unknown subpixel layout.

SRM_CONNECTOR_SUBPIXEL_HORIZONTAL_RGB 

Horizontal subpixel layout with RGB order.

Red, green, and blue subpixels are arranged horizontally.

SRM_CONNECTOR_SUBPIXEL_HORIZONTAL_BGR 

Horizontal subpixel layout with BGR order.

Blue, green, and red subpixels are arranged horizontally.

SRM_CONNECTOR_SUBPIXEL_VERTICAL_RGB 

Vertical subpixel layout with RGB order.

Red, green, and blue subpixels are arranged vertically.

SRM_CONNECTOR_SUBPIXEL_VERTICAL_BGR 

Vertical subpixel layout with BGR order.

Blue, green, and red subpixels are arranged vertically.

SRM_CONNECTOR_SUBPIXEL_NONE 

No specific subpixel layout.

The connector does not have a well-defined order for subpixels.

◆ SRM_CONNECTOR_CONTENT_TYPE

Content type hint.

This hint is utilized by certain hardware displays to adjust settings optimally based on the displayed content. For example, setting the SRM_CONNECTOR_CONTENT_TYPE_GAME hint may prompt the hardware to minimize latency.

Enumerator
SRM_CONNECTOR_CONTENT_TYPE_GRAPHICS 

Graphics.

SRM_CONNECTOR_CONTENT_TYPE_PHOTO 

Photo.

SRM_CONNECTOR_CONTENT_TYPE_VIDEO 

Video.

SRM_CONNECTOR_CONTENT_TYPE_GAME 

Game.

Function Documentation

◆ srmConnectorSetUserData()

void srmConnectorSetUserData ( SRMConnector connector,
void *  userData 
)

Sets the connector user data.

This function sets the user data associated with the given SRMConnector.

Note
This user data is distinct from the one passed in srmConnectorInitialize().
Parameters
connectorPointer to the SRMConnector whose user data is to be set.
userDataPointer to the user data to be associated with the connector.

◆ srmConnectorGetUserData()

void* srmConnectorGetUserData ( SRMConnector connector)

Retrieves the connector user data.

This function retrieves the user data associated with the given SRMConnector.

Note
This user data is distinct from the one passed in srmConnectorInitialize().
Parameters
connectorPointer to the SRMConnector from which to retrieve the user data.
Returns
Pointer to the user data associated with the connector.

◆ srmConnectorGetDevice()

SRMDevice* srmConnectorGetDevice ( SRMConnector connector)

Get the device this connector belongs to.

This function returns the device to which the connector belongs.

Parameters
connectorPointer to the SRMConnector for which to retrieve the device.
Returns
Pointer to the SRMDevice to which the connector belongs.
Note
The device may not always be the same as the renderer device.

◆ srmConnectorGetRendererDevice()

SRMDevice* srmConnectorGetRendererDevice ( SRMConnector connector)

Retrieve the renderer device associated with the connector.

This function returns the device responsible for rendering operations for the connector.

When the ITSELF rendering mode is used, this device is the same as the one obtained with srmConnectorGetDevice(). However, in the PRIME, DUMB or CPU modes, it differs.

Parameters
connectorPointer to the SRMConnector for which you want to obtain the renderer device.
Returns
Pointer to the SRMDevice responsible for rendering operations for the connector.
Note
Use this device when you need to access the OpenGL texture of a SRMBuffer with srmBufferGetTextureId().

◆ srmConnectorGetID()

UInt32 srmConnectorGetID ( SRMConnector connector)

Get the DRM connector ID.

This function returns the DRM connector ID associated with the connector.

Parameters
connectorPointer to the SRMConnector for which to retrieve the connector ID.
Returns
The DRM connector ID of the connector.

◆ srmConnectorGetState()

SRM_CONNECTOR_STATE srmConnectorGetState ( SRMConnector connector)

Get the current state of the connector.

This function returns the current state for the given SRMConnector.

Parameters
connectorPointer to the SRMConnector for which to retrieve the state.
Returns
The current rendering state (e.g., initialized, uninitialized, etc).

◆ srmConnectorIsConnected()

UInt8 srmConnectorIsConnected ( SRMConnector connector)

Check if the connector is connected.

This function checks whether the given SRMConnector is connected.

Note
Only connected connectors can be initialized. Calling srmConnectorInitialize() on a disconnected connector has no effect.
Parameters
connectorPointer to the SRMConnector to check for connection.
Returns
1 if the connector is connected, 0 otherwise.

◆ srmConnectorGetmmWidth()

UInt32 srmConnectorGetmmWidth ( SRMConnector connector)

Get the physical width of the connector in millimeters.

This function returns the physical width of the connector in millimeters.

Parameters
connectorPointer to the SRMConnector for which to retrieve the width.
Returns
The physical width of the connector in millimeters.

◆ srmConnectorGetmmHeight()

UInt32 srmConnectorGetmmHeight ( SRMConnector connector)

Get the physical height of the connector in millimeters.

This function returns the physical height of the connector in millimeters.

Parameters
connectorPointer to the SRMConnector for which to retrieve the height.
Returns
The physical height of the connector in millimeters.

◆ srmConnectorGetType()

UInt32 srmConnectorGetType ( SRMConnector connector)

Get the DRM type of the connector.

This function returns the DRM type associated with the connector (DRM_MODE_CONNECTOR_xx macros defined in drm_mode.h).

Parameters
connectorPointer to the SRMConnector for which to retrieve the type.
Returns
The DRM type of the connector.

◆ srmConnectorGetName()

const char* srmConnectorGetName ( SRMConnector connector)

Get the name of the connector.

The name is always unique, even across devices but could change after a reboot.

Returns
The name of the connector, e.g. HDMI-A-1 or "Unknown" if not available.

◆ srmConnectorGetManufacturer()

const char* srmConnectorGetManufacturer ( SRMConnector connector)

Get the manufacturer of the connected display.

Returns
The manufacturer name or "Unknown" if not available.

◆ srmConnectorGetModel()

const char* srmConnectorGetModel ( SRMConnector connector)

Get the model of the connected display.

Returns
The model name or "Unknown" if not available.

◆ srmConnectorGetSerial()

const char* srmConnectorGetSerial ( SRMConnector connector)

Get the serial number of the connected display.

Note
The serial number is unique and persistent across reboots.
Returns
The serial number of the connected display or NULL if not available.

◆ srmConnectorGetEncoders()

SRMList * srmConnectorGetEncoders ( SRMConnector connector)

Get a list of available connector encoders.

Returns
A list of available connector encoders (SRMEncoder).

This function returns a list of available encoders for the given SRMConnector.

Parameters
connectorPointer to the SRMConnector for which to retrieve the encoders.
Returns
A list of available connector encoders (SRMEncoder).

◆ srmConnectorGetModes()

SRMList * srmConnectorGetModes ( SRMConnector connector)

Get a list of available connector modes.

This function returns a list of available modes (resolutions and refresh rates) for the given SRMConnector.

Parameters
connectorPointer to the SRMConnector for which to retrieve the modes.
Returns
A list of available connector modes (SRMConnectorMode).

◆ srmConnectorHasHardwareCursor()

UInt8 srmConnectorHasHardwareCursor ( SRMConnector connector)

Check if there is an available cursor plane for hardware cursor compositing.

This function checks if there is an available cursor plane for hardware cursor compositing on the given SRMConnector.

Parameters
connectorPointer to the SRMConnector to check for hardware cursor support.
Returns
1 if hardware cursor support is available, 0 otherwise.

◆ srmConnectorSetCursor()

UInt8 srmConnectorSetCursor ( SRMConnector connector,
UInt8 pixels 
)

Set the pixels of the hardware cursor.

This function sets the pixels of the hardware cursor for the given SRMConnector.

The format of the buffer must be ARGB8888 with a size of 64x64 pixels. Passing NULL as the buffer hides the cursor.

Parameters
connectorPointer to the SRMConnector for which to set the hardware cursor.
pixelsPointer to the ARGB8888 pixel buffer for the cursor image.
Returns
1 if the hardware cursor was successfully set, 0 if an error occurred.

◆ srmConnectorSetCursorPos()

UInt8 srmConnectorSetCursorPos ( SRMConnector connector,
Int32  x,
Int32  y 
)

Set the position of the hardware cursor relative to the connector's top-left origin.

This function sets the position of the hardware cursor relative to the top-left origin of the connector.

Parameters
connectorPointer to the SRMConnector for which to set the cursor position.
xThe X-coordinate of the cursor's position.
yThe Y-coordinate of the cursor's position.
Returns
1 if the cursor position was successfully set, 0 if an error occurred.

◆ srmConnectorGetCurrentEncoder()

SRMEncoder* srmConnectorGetCurrentEncoder ( SRMConnector connector)

Get the currently used encoder for the connector.

This function returns the currently used SRMEncoder associated with the given SRMConnector.

Parameters
connectorPointer to the SRMConnector for which to retrieve the current encoder.
Returns
The currently used SRMEncoder for the connector.

◆ srmConnectorGetCurrentCrtc()

SRMCrtc* srmConnectorGetCurrentCrtc ( SRMConnector connector)

Get the currently used CRT controller (CRTC) for the connector.

This function returns the currently used SRMCrtc associated with the given SRMConnector.

Parameters
connectorPointer to the SRMConnector for which to retrieve the current CRTC.
Returns
The currently used SRMCrtc for the connector.

◆ srmConnectorGetCurrentPrimaryPlane()

SRMPlane* srmConnectorGetCurrentPrimaryPlane ( SRMConnector connector)

Get the currently used primary plane for the connector.

This function returns the currently used SRMPlane associated with the primary display plane for the given SRMConnector.

Parameters
connectorPointer to the SRMConnector for which to retrieve the current primary plane.
Returns
The currently used SRMPlane for the primary display.

◆ srmConnectorGetCurrentCursorPlane()

SRMPlane* srmConnectorGetCurrentCursorPlane ( SRMConnector connector)

Get the currently used cursor plane for the connector.

This function returns the currently used SRMPlane associated with the cursor display plane for the given SRMConnector.

Parameters
connectorPointer to the SRMConnector for which to retrieve the current cursor plane.
Returns
The currently used SRMPlane for the cursor display or NULL if not assigned.

◆ srmConnectorGetPreferredMode()

SRMConnectorMode* srmConnectorGetPreferredMode ( SRMConnector connector)

Get the preferred connector mode.

This function returns the preferred SRMConnectorMode for the given SRMConnector .
This mode typically has the higher resolution and refresh rate.

Parameters
connectorPointer to the SRMConnector for which to retrieve the preferred mode.
Returns
The preferred SRMConnectorMode for the connector.

◆ srmConnectorGetCurrentMode()

SRMConnectorMode* srmConnectorGetCurrentMode ( SRMConnector connector)

Get the current connector mode.

This function returns the current SRMConnectorMode for the given SRMConnector.

Parameters
connectorPointer to the SRMConnector for which to retrieve the current mode.
Returns
The current SRMConnectorMode for the connector.

◆ srmConnectorSetMode()

UInt8 srmConnectorSetMode ( SRMConnector connector,
SRMConnectorMode mode 
)

Sets the current mode of the connector.

This function sets the current mode of the given SRMConnector. You can use srmConnectorGetModes() to obtain a list of all available modes. If the connector is initialized the resizeGL() event is invoked.

Note
All connector use the srmConnectorGetPreferredMode() by default.
Warning
Do not call this function from any of the OpenGL events, as it may result in a deadlock.
Parameters
connectorPointer to the SRMConnector for which to set the mode.
modePointer to the SRMConnectorMode to set as the current mode.
Returns
1 if setting the mode is successful, 0 if an error occurs.

◆ srmConnectorInitialize()

UInt8 srmConnectorInitialize ( SRMConnector connector,
SRMConnectorInterface interface,
void *  userData 
)

Initializes a connector, creating its rendering thread and invoking initializeGL() once initialized.

This function initializes the given SRMConnector. After initialization, calling srmConnectorRepaint() schedules a new rendering frame, which invokes paintGL() followed by a pageFlipped() event.

Parameters
connectorPointer to the SRMConnector to initialize.
interfacePointer to the SRMConnectorInterface struct to handle events.
userDataPointer to user data to be associated with the connector.
Returns
1 if initialization is successful, 0 if an error occurs.
Warning
Make sure to correctly set up the SRMConnectorInterface to handle all its events, otherwise, it may crash.

◆ srmConnectorRepaint()

UInt8 srmConnectorRepaint ( SRMConnector connector)

Schedules a new rendering frame.

This function schedules a new rendering frame for the given SRMConnector. Calling this method multiple times during the same frame will not invoke paintGL() multiple times, only once. After each paintGL() event, this method must be called again to schedule a new frame.

Parameters
connectorPointer to the SRMConnector to schedule a new rendering frame.
Returns
1 if scheduling is successful, 0 if an error occurs.
Note
This function triggers paintGL() and pageFlipped() events in the rendering process.

◆ srmConnectorUninitialize()

void srmConnectorUninitialize ( SRMConnector connector)

Uninitializes the connector.

This function uninitializes the given SRMConnector, eventually calling uninitializeGL() once uninitialized.

Warning
Do not call this function from any of the OpenGL events, as it may result in a deadlock.
Parameters
connectorPointer to the SRMConnector to uninitialize.

◆ srmConnectorSuspend()

UInt8 srmConnectorSuspend ( SRMConnector connector)

Locks the rendering thread until srmConnectorResume() is called.

This function locks the rendering thread of the SRMConnector until srmConnectorResume() is called to unlock it.

Warning
Do not call this function from any of the OpenGL events, as it may result in a deadlock.
Parameters
connectorPointer to the SRMConnector to suspend.
Returns
1 if pausing is successful, 0 if an error occurs.

◆ srmConnectorResume()

UInt8 srmConnectorResume ( SRMConnector connector)

Unlocks the rendering thread if previously locked with srmConnectorSuspend().

This function unlocks the rendering thread of the SRMConnector if it was previously locked with srmConnectorSuspend().

Warning
Do not call this function from any of the OpenGL events, as it may result in a deadlock.
Parameters
connectorPointer to the SRMConnector to resume.
Returns
1 if resuming is successful, 0 if an error occurs.

◆ srmConnectorGetFramebufferID()

UInt32 srmConnectorGetFramebufferID ( SRMConnector connector)

Retrieves the ID of the currently bound OpenGL framebuffer.

◆ srmConnectorGetContext()

EGLContext srmConnectorGetContext ( SRMConnector connector)

Retrieves the EGLContext associated with the rendering thread.

Returns
The EGLContext of the rendering thread, or EGL_NO_CONTEXT if it is uninitialized.

◆ srmConnectorGetCurrentBufferAge()

UInt32 srmConnectorGetCurrentBufferAge ( SRMConnector connector)

Retrieves the age of the current buffer.

This function returns the age of the buffer as specified in the EGL_EXT_buffer_age extension specification.

◆ srmConnectorGetCurrentBufferIndex()

UInt32 srmConnectorGetCurrentBufferIndex ( SRMConnector connector)

Returns the current framebuffer index.

This function returns the index of the current framebuffer where the rendered content is stored during a paintGL() event.

Parameters
connectorPointer to the SRMConnector to query for the current framebuffer index.
Returns
The current framebuffer index.

◆ srmConnectorGetBuffersCount()

UInt32 srmConnectorGetBuffersCount ( SRMConnector connector)

Returns the number of framebuffers.

This function returns the number of framebuffers available for the given SRMConnector. The count may be 2 or 3, depending on the configuration (double or triple buffering).

The number of framebuffers can be modified by setting the SRM_RENDER_MODE_{ITSELF, PRIME, DUMB, CPU}_FB_COUNT environment variables.

Parameters
connectorPointer to the SRMConnector to query for the number of framebuffers.
Returns
The number of framebuffers.

◆ srmConnectorGetBuffer()

SRMBuffer* srmConnectorGetBuffer ( SRMConnector connector,
UInt32  bufferIndex 
)

Returns the buffer of a specific framebuffer index, usable as a texture for rendering.

This function returns the buffer of the specified framebuffer index of the given SRMConnector. This buffer can be used as a texture for rendering, but it may not always be supported. Always check if NULL is returned.

Additionally, note that the buffer may not always be shared among all GPUs. In such cases, calling srmBufferGetTextureID() may return 0.

Parameters
connectorPointer to the SRMConnector for which to retrieve the framebuffer buffer.
bufferIndexThe index of the framebuffer buffer to retrieve.
Returns
A pointer to the SRMBuffer if available, or NULL if not supported.

◆ srmConnectorHasBufferDamageSupport()

UInt8 srmConnectorHasBufferDamageSupport ( SRMConnector connector)

Checks if the connector benefits from providing it damage information generated during the last paintGL() call.

This function checks if the given SRMConnector benefits from receiving damage information generated during the last paintGL() call. Providing this information may improve performance, specifically when using DUMB or CPU render modes, as the connector will only copy the specified rectangles.

Parameters
connectorPointer to the SRMConnector to check for buffer damage support.
Returns
1 if the connector supports buffer damage notifications, 0 otherwise.

◆ srmConnectorSetBufferDamage()

UInt8 srmConnectorSetBufferDamage ( SRMConnector connector,
SRMRect rects,
Int32  n 
)

Notifies the connector of new damage generated during the last paintGL() call.

This function notifies the given SRMConnector of new damage areas generated during the last paintGL() call.
Providing this damage information can considerably improve performance when using the DUMB or CPU render modes, as the connector will only copy the specified region. The damage specified is only valid during the current frame and is cleared in the next frame.

Note
Use srmConnectorHasBufferDamageSupport() to determine whether the connector can benefit from providing this information.
Parameters
connectorPointer to the SRMConnector to notify of buffer damage.
rectsAn array of SRMRect structures representing the damaged area.
nThe number of rectangles in the array. Passing 0 unsets the current damage.
Returns
1 if the damage notification is successful, 0 if an error occurs.
Warning
It is important to ensure that the coordinates of the rectangles originate from the top-left corner of the framebuffer and do not extend beyond its boundaries to avoid segmentation errors.

◆ srmConnectorSetBufferDamageBoxes()

UInt8 srmConnectorSetBufferDamageBoxes ( SRMConnector connector,
SRMBox boxes,
Int32  n 
)

Notifies the connector of new damage generated during the last paintGL() call using boxes.

This method is analogous to srmConnectorSetBufferDamage(), but instead of SRMRect, it accepts SRMBox.

See also
srmConnectorSetBufferDamage().
Parameters
connectorPointer to the SRMConnector structure to notify of buffer damage.
boxesAn array of SRMBox structures representing the damaged areas.
nThe number of boxes in the array. Passing 0 unsets the current damage.
Returns
Returns 1 if the damage notification is successful, 0 if an error occurs.

◆ srmConnectorGetSubPixel()

SRM_CONNECTOR_SUBPIXEL srmConnectorGetSubPixel ( SRMConnector connector)

Get the subpixel layout associated with a connector.

This function retrieves the subpixel layout associated with a given connector. Subpixels are individual color elements that make up a pixel on a display, and the subpixel layout is crucial for accurate color interpretation and display. The returned value indicates how the red, green, and blue subpixels are arranged in relation to each other.

Note
The returned value is only meaningful when a display is connected. If the subpixel layout is unknown or not applicable, the method may return SRM_CONNECTOR_SUBPIXEL_UNKNOWN or SRM_CONNECTOR_SUBPIXEL_NONE, respectively.
Parameters
connectorPointer to the SRMConnector for which the subpixel layout is requested.
Returns
The subpixel layout associated with the connector.

◆ srmConnectorGetGammaSize()

UInt64 srmConnectorGetGammaSize ( SRMConnector connector)

Gets the number of elements used to represent each RGB gamma correction curve.

This function retrieves the number of elements (N) used to represent each RGB gamma correction curve, where N is the count of UInt16 elements for red, green, and blue curves.

Note
This method should only be called once the connector is assigned a CRTC, meaning after the connector is initialized. If called when uninitialized, it returns 0. If the connector is initialized and this method returns 0, it indicates that the driver does not support gamma correction.
Parameters
connectorPointer to the SRMConnector.
Returns
The number of elements used to represent each RGB gamma correction curve, or 0 if the connector is uninitialized or if the driver does not support gamma correction.

◆ srmConnectorSetGamma()

UInt8 srmConnectorSetGamma ( SRMConnector connector,
UInt16 table 
)

Sets the gamma correction curves for each RGB component.

This method allows you to set the gamma correction curves for each RGB component. The number of elements for each curve (N) should be obtained using srmConnectorGetGammaSize(). The table array should then have a size of 3 * N * sizeof(UInt16) bytes, with N UInt16 values for red, N for green, and N for blue, in that order. Each value of the curves can represent the full range of UInt16.

Note
This method must only be called after the connector is initialized. If the connector is uninitialized or the driver does not support gamma correction, the function returns 0.

The default gamma curves are linear.

Parameters
connectorPointer to the SRMConnector.
tablePointer to the array containing RGB curves for gamma correction.
Returns
On success, returns 1. On failure (uninitialized connector or no gamma correction support), returns 0.

◆ srmConnectorHasVSyncControlSupport()

UInt8 srmConnectorHasVSyncControlSupport ( SRMConnector connector)

Checks if the driver supports the ability to turn off vsync.

If the return value is 0, it indicates that vsync is always enabled.

Note
Disabling vsync for the atomic API is supported only starting from Linux version 6.8. If you wish to enforce the use of the legacy API, set the SRM_FORCE_LEGACY_API environment variable to 1.
Parameters
connectorThe SRMConnector instance.
Returns
1 if vsync control is supported, 0 otherwise.

◆ srmConnectorIsVSyncEnabled()

UInt8 srmConnectorIsVSyncEnabled ( SRMConnector connector)

Returns the current vsync status.

Returns 1 if vsync is enabled, 0 otherwise. V-Sync is enabled by default.

Parameters
connectorThe SRMConnector instance.
Returns
1 if vsync is enabled, 0 if not.

◆ srmConnectorEnableVSync()

UInt8 srmConnectorEnableVSync ( SRMConnector connector,
UInt8  enabled 
)

Enable or disable vsync.

Disabling vsync is only allowed if srmConnectorHasVSyncControlSupport() returns 1. VSync is enabled by default.

Note
Disabling vsync for the atomic API is supported only starting from Linux version 6.8. If you wish to enforce the use of the legacy API, set the SRM_FORCE_LEGACY_API environment variable to 1.
Parameters
connectorThe SRMConnector instance.
enabledSet to 1 to enable vsync, 0 to disable vsync.
Returns
1 if the vsync change was successful, 0 otherwise.

◆ srmConnectorSetRefreshRateLimit()

void srmConnectorSetRefreshRateLimit ( SRMConnector connector,
Int32  hz 
)

Sets the refresh rate limit when vsync is disabled.

This function allows controlling the refresh rate limit when vsync is disabled

Parameters
connectorA pointer to the SRMConnector instance for which the refresh rate limit is to be set.
hzThe desired refresh rate limit in hertz. If hz is less than 0, the refresh rate limit is disabled. If hz is 0, the maximum refresh rate will be approximately twice the current display mode refresh rate. The default value is 0.
Note
Using a value of 0 (twice the current mode refresh rate) provides a good balance between avoiding unnecessary undisplayed frames and achieving snappier response times.
See also
srmConnectorGetRefreshRateLimit() to retrieve the current refresh rate limit.
Warning
Disabling the limit may result in visual artifacts and could potentially impact performance.

◆ srmConnectorGetRefreshRateLimit()

Int32 srmConnectorGetRefreshRateLimit ( SRMConnector connector)

Retrieves the current refresh rate limit when vsync is disabled.

This function allows you to query the refresh rate limit that has been previously set using the srmConnectorSetRefreshRateLimit() function.

Parameters
connectorA pointer to the SRMConnector instance for which the refresh rate limit is to be retrieved.
Returns
The current refresh rate limit in hertz. If the refresh rate limit is disabled, the returned value will be less than 0. If the returned value is 0, means the limit is about twice the current display mode refresh rate.

◆ srmConnectorGetPresentationClock()

clockid_t srmConnectorGetPresentationClock ( SRMConnector connector)

Gets the clock ID used for the timestamps returned by srmConnectorGetPresentationTime().

The clock ID can be either CLOCK_MONOTONIC or CLOCK_REALTIME.

Parameters
connectorA pointer to the SRMConnector instance.
Returns
The clock ID used for timestamps.

◆ srmConnectorGetPresentationTime()

const SRMPresentationTime* srmConnectorGetPresentationTime ( SRMConnector connector)

Retrieves information about how and when the current framebuffer displayed on the screen was presented.

Parameters
connectorA pointer to the SRMConnector instance.
Returns
Pointer to the structure containing presentation time information, see SRMPresentationTime.

◆ srmConnectorSetContentType()

void srmConnectorSetContentType ( SRMConnector connector,
SRM_CONNECTOR_CONTENT_TYPE  contentType 
)

Sets a hint of the content type being displayed.

See also
SRM_CONNECTOR_CONTENT_TYPE
Note
The default value is SRM_CONNECTOR_CONTENT_TYPE_GRAPHICS
Parameters
connectorA pointer to the SRMConnector instance.
contentTypeThe content type hint.

◆ srmConnectorGetContentType()

SRM_CONNECTOR_CONTENT_TYPE srmConnectorGetContentType ( SRMConnector connector)

Gets the content type hint.

See also
srmConnectorSetContentType()
Parameters
connectorA pointer to the SRMConnector instance.

◆ srmConnectorSetCustomScanoutBuffer()

UInt8 srmConnectorSetCustomScanoutBuffer ( SRMConnector connector,
SRMBuffer buffer 
)

Sets a custom scanout buffer for the primary plane.

This function allows you to set a custom scanout buffer for the primary plane only during a single frame. It must called within a paintGL() event. Calling it outside a paintGL() will result in an error.

If successfully set, the current buffer index is not updated, and no OpenGL rendering operations should be performed within the paintGL() event. If not set again in subsequent frames, the connector's framebuffers are restored, and the current buffer index continues to be updated as usual.

Note
The size of the buffer must match the dimensions of the current connector's mode.

If successfully set, the internal reference counter of the buffer is increased, ensuring it remains scannable for at least the given frame even if it is destroyed.

Note
If SRM_DISABLE_CUSTOM_SCANOUT is set to 1, this function always return 0.
Parameters
connectorA pointer to the SRMConnector instance.
bufferThe buffer to scan, or NULL to restore the default connector framebuffers.
Returns
1 if the custom buffer will be scanned, 0 otherwise.

◆ srmConnectorIsNonDesktop()

UInt8 srmConnectorIsNonDesktop ( SRMConnector connector)

Checks if the connector is not intended for desktop usage.

Some connectors, such as VR headsets, set this property to 1 to indicate they are not meant for desktop use.

Returns
1 if not meant for desktop usage, 0 if meant for desktop or if disconnected.