mirror of
https://github.com/blendogames/quadrilateralcowboy.git
synced 2024-11-10 06:41:36 +00:00
385 lines
15 KiB
Text
385 lines
15 KiB
Text
|
|
NV-CONTROL X Extension - API specificiation v 1.6
|
|
|
|
|
|
1. INTRODUCTION
|
|
|
|
The NV-CONTROL X extension provides a mechanism for X clients to
|
|
query and set configuration parameters of the NVIDIA X driver.
|
|
State set by the NV-CONTROL X extension is assumed to be persistent
|
|
only for the current server generation.
|
|
|
|
Attributes are configurable on a per X screen basis, and some
|
|
attributes are also configurable on a per display device basis.
|
|
Addtionally, some attributes can only be queried, though most can
|
|
be both queried and modified. The NV-CONTROL extension provides
|
|
a mechanism to determine what values are valid for an attribute,
|
|
if an attribute is read-only, if it can be read and written, if it
|
|
requires a display device qualifier, and if the the attribute is
|
|
available on the specified X screen.
|
|
|
|
Finally, NV-CONTROL clients may also request to be notified when an
|
|
attribute is changed by any other NV-CONTROL client.
|
|
|
|
|
|
|
|
2. DISPLAY DEVICES
|
|
|
|
A "Display Device" refers to some piece of hardware capable of
|
|
displaying an image. Display devices are separated into the three
|
|
general categories: analog CRTs, digital flatpanels, and TVs.
|
|
Note that analog flatpanels fall under the category of analog CRTs.
|
|
|
|
The NVIDIA X driver allows multiple display devices to display
|
|
portions of the same X screen; this is configured through the
|
|
TwinView feature of the NVIDIA X driver. TwinView is described in
|
|
the Appendix on TwinView in the NVIDIA Linux driver text README file.
|
|
A consequence of TwinView is that an X screen does not necessarily
|
|
uniquely identify a display device.
|
|
|
|
While most attributes controlled by the NV-CONTROL X extension
|
|
apply to an entire X screen, some attributes can be controlled per
|
|
display device. When querying and assigning such attributes, the
|
|
particular display device is specified via a display device mask.
|
|
|
|
A "display device mask" is an unsigned 32 bit value that identifies
|
|
one or more display devices: the first 8 bits each identify a CRT, the
|
|
next 8 bits each identify a TV, and the next 8 each identify a DFP.
|
|
For example, 0x1 refers to CRT-0, 0x3 refers to CRT-0 and CRT-1,
|
|
0x10001 refers to CRT-0 and DFP-0, etc.
|
|
|
|
|
|
|
|
3. QUERYING THE EXTENSION
|
|
|
|
NV-CONTROL clients can query for the existence of the NV-CONTROL X
|
|
extension with:
|
|
|
|
Bool XNVCTRLQueryExtension (Display *dpy,
|
|
int *event_basep, int *error_basep);
|
|
|
|
This function returns True if the extension exists, and returns False
|
|
if the extension does not. It also returns the error and event bases.
|
|
The arguments are:
|
|
|
|
dpy - The connection to the X server.
|
|
event_basep - The returned event base. Currently, only one
|
|
extension specific event is defined.
|
|
error_basep - The returned error base. Currently, no extension
|
|
specific errors are defined.
|
|
|
|
The version of the NV-CONTROL extension can be queried with:
|
|
|
|
Bool XNVCTRLQueryVersion (Display *dpy, int *major, int *minor);
|
|
|
|
This function returns True if the extension exists, and returns
|
|
False if it does not. It also returns the major and minor version
|
|
numbers of the extension. The arguments are:
|
|
|
|
dpy - The connection to the X server.
|
|
major - The returned major version number of the extension.
|
|
minor - The returned minor version number of the extension.
|
|
|
|
|
|
You can determine if a particular X screen is controlled by the
|
|
NVIDIA X driver (and thus supports the NV-CONTROL X extension) with:
|
|
|
|
Bool XNVCTRLIsNvScreen (Display *dpy, int screen);
|
|
|
|
This function returns True if the specified screen is controlled by
|
|
the NVIDIA driver, and thus supports the NV-CONTROL X extension.
|
|
It returns False if the specified screen does not support the
|
|
NV-CONTROL X extension. The arguments are:
|
|
|
|
dpy - The connection to the X server.
|
|
screen - the X screen to query.
|
|
|
|
|
|
|
|
4. QUERYING VALID ATTRIBUTE VALUES
|
|
|
|
NV-CONTROL clients can query the valid values for any integer
|
|
attribute with:
|
|
|
|
Bool XNVCTRLQueryValidAttributeValues (Display *dpy,
|
|
int screen,
|
|
unsigned int display_mask,
|
|
unsigned int attribute,
|
|
NVCTRLAttributeValidValuesRec
|
|
*values);
|
|
|
|
This function returns True if the attribute exists on the specified
|
|
X screen, or False if the attribute is not available on the specified
|
|
X screen.
|
|
|
|
The arguments are:
|
|
|
|
dpy - The connection to the X server.
|
|
screen - the X screen to query.
|
|
display_mask - for attributes that can be controlled on a per
|
|
display device basis, the display_mask should
|
|
uniquely identify a single display device.
|
|
This argument is ignored for attributes that
|
|
apply to the entire X screen.
|
|
attribute - the integer attribute to query
|
|
values - the returned NVCTRLAttributeValidValuesRec structure.
|
|
|
|
The NVCTRLAttributeValidValuesRec structure is defined as:
|
|
|
|
typedef struct _NVCTRLAttributeValidValues {
|
|
int type;
|
|
union {
|
|
struct {
|
|
int min;
|
|
int max;
|
|
} range;
|
|
struct {
|
|
unsigned int ints;
|
|
} bits;
|
|
} u;
|
|
unsigned int permissions;
|
|
} NVCTRLAttributeValidValuesRec;
|
|
|
|
Where type can be one of:
|
|
|
|
#define ATTRIBUTE_TYPE_UNKNOWN 0
|
|
#define ATTRIBUTE_TYPE_INTEGER 1
|
|
#define ATTRIBUTE_TYPE_BITMASK 2
|
|
#define ATTRIBUTE_TYPE_BOOL 3
|
|
#define ATTRIBUTE_TYPE_RANGE 4
|
|
#define ATTRIBUTE_TYPE_INT_BITS 5
|
|
|
|
ATTRIBUTE_TYPE_INTEGER indicates that the attribute is an integer
|
|
value; any integer may be specified when setting this attribute.
|
|
|
|
ATTRIBUTE_TYPE_BITMASK indicates that the attribute is an integer
|
|
value, interpretted as a bitmask. This is the type, for example,
|
|
of the NV_CTRL_CONNECTED_DISPLAYS attribute.
|
|
|
|
ATTRIBUTE_TYPE_BOOL indicates that the attribute is a boolean;
|
|
valid values are 1 (on/true) and 0 (off/false).
|
|
|
|
ATTRIBUTE_TYPE_RANGE indicates that the attribute can have any
|
|
integer value between NVCTRLAttributeValidValues.u.range.min and
|
|
NVCTRLAttributeValidValues.u.range.max (inclusive).
|
|
|
|
ATTRIBUTE_TYPE_INT_BITS indicates that the attribute can
|
|
only have certain integer values, indicated by which bits in
|
|
NVCTRLAttributeValidValues.u.bits.ints are on (for example: if bit
|
|
0 is on, then 0 is a valid value; if bit 5 is on, then 5 is a valid
|
|
value, etc). This is the type, for example, of NV_CTRL_FSAA_MODE.
|
|
|
|
|
|
The permissions field in NVCTRLAttributeValidValuesRec is a bitmask
|
|
that can contain any of:
|
|
|
|
#define ATTRIBUTE_TYPE_READ 0x1
|
|
#define ATTRIBUTE_TYPE_WRITE 0x2
|
|
#define ATTRIBUTE_TYPE_DISPLAY 0x4
|
|
|
|
ATTRIBUTE_TYPE_READ indicates that the attribute is readable; in
|
|
general, all attributes will be readable.
|
|
|
|
ATTRIBUTE_TYPE_WRITE indicates that the attribute is writable;
|
|
attributes may not be writable for various reasons: they represent
|
|
static system information, they can only be changed by changing an
|
|
XF86Config option, etc.
|
|
|
|
ATTRIBUTE_TYPE_DISPLAY indicates that the attribute can be
|
|
controlled on a per display device basis, and thus
|
|
XNVCTRLQueryAttribute() and XNVCTRLSetAttribute() require that a
|
|
display device be specified.
|
|
|
|
The XNVCTRLQueryValidAttributeValues() function can cause the
|
|
following X protocol errors:
|
|
|
|
BadValue - The screen does not exist.
|
|
BadMatch - The NVIDIA driver is not present on that screen.
|
|
|
|
|
|
|
|
5. QUERYING ATTRIBUTE VALUES
|
|
|
|
NV-CONTROL clients can query the current value of an integer
|
|
attribute with:
|
|
|
|
Bool XNVCTRLQueryAttribute (Display *dpy,
|
|
int screen,
|
|
unsigned int display_mask,
|
|
unsigned int attribute,
|
|
int *value);
|
|
|
|
This function returns True if the attribute exists, and stores the
|
|
current attribute value in the memory pointed to by the value
|
|
argument. False is returned if the attribute does not exist on the
|
|
specified X screen.
|
|
|
|
The arguments are:
|
|
|
|
dpy - The connection to the X server.
|
|
screen - the X screen to query.
|
|
display_mask - if the attribute requires a display device,
|
|
then this indicates the display device to query;
|
|
this field is ignored if the attribute is not
|
|
display device specific. You can determine
|
|
if an attribute is display device specific by
|
|
querying the valid values and checking for the
|
|
ATTRIBUTE_TYPE_DISPLAY bit in the permissions
|
|
field.
|
|
attribute - the attribute to query.
|
|
value - the returned attribute value.
|
|
|
|
This function can cause the following X protocol errors:
|
|
|
|
BadValue - The screen does not exist.
|
|
BadMatch - The NVIDIA driver is not present on that screen.
|
|
|
|
|
|
NV-CONTROL clients can query the read-only string attributes with:
|
|
|
|
Bool XNVCTRLQueryStringAttribute (Display *dpy,
|
|
int screen,
|
|
unsigned int display_mask,
|
|
unsigned int attribute,
|
|
char **ptr);
|
|
|
|
This function returns True if the string attribute exists;
|
|
or it returns False if the string attribute does not exist. If
|
|
XNVCTRLQueryStringAttribute returns True, *ptr will point to an
|
|
allocated string containing the string attribute requested. It is
|
|
the caller's responsibility to free the string with XFree().
|
|
|
|
The arguments are:
|
|
|
|
dpy - The connection to the X server.
|
|
screen - the X screen to query.
|
|
display_mask - if the attribute requires a display device,
|
|
then this indicates the display device to query;
|
|
this field is ignored if the attribute is not
|
|
display device specific.
|
|
attribute - the string attribute to query
|
|
ptr - the returned allocated string
|
|
|
|
This function can cause the following X protocol errors:
|
|
|
|
BadValue - The screen does not exist.
|
|
BadMatch - The NVIDIA driver is not present on that screen.
|
|
BadAlloc - Insufficient resources to fulfill the request.
|
|
|
|
See NVCtrl.h (distributed in the src/libXNVCtrl/ directory of
|
|
the nvidia-settings source package) for a list of possible string
|
|
attributes.
|
|
|
|
|
|
|
|
6. ASSIGNING ATTRIBUTE VALUES
|
|
|
|
An integer attribute can be assigned a value with:
|
|
|
|
void XNVCTRLSetAttribute (Display *dpy,
|
|
int screen,
|
|
unsigned int display_mask,
|
|
unsigned int attribute,
|
|
int value);
|
|
|
|
This function sets the attribute to the given value. This function
|
|
does not have a return value. Note that, because it does not
|
|
return a value, XNVCTRLSetAttribute() only queues the request in
|
|
the X command stream. The command will not actually be sent to
|
|
the server until an X command that flushes the X command stream
|
|
(such as XFlush(), or any API command that queries a value from the
|
|
server) is called.
|
|
|
|
The arguments are:
|
|
|
|
dpy - The connection to the X server.
|
|
screen - the X screen to query.
|
|
display_mask - if the attribute requires a display device,
|
|
then this indicates the display device to set;
|
|
this field is ignored if the attribute is not
|
|
display device specific. You can determine
|
|
if an attribute is display device specific by
|
|
querying the valid values and checking for the
|
|
ATTRIBUTE_TYPE_DISPLAY bit in the permissions
|
|
field.
|
|
attribute - the attribute to set.
|
|
value - the value the attribute should be set to.
|
|
|
|
See NVCtrl.h (distributed in the src/libXNVCtrl/ directory of
|
|
the nvidia-settings source package) for a list of possible integer
|
|
attributes.
|
|
|
|
This function can cause the following X protocol errors:
|
|
|
|
BadMatch - The NVIDIA driver is not present on that screen.
|
|
BadValue - The screen does not exist, or an invalid value is
|
|
specified, or the attribute does not exist on the
|
|
specified X screen, or the attribute requires a
|
|
display device and display_mask does not uniquely
|
|
identify a display device.
|
|
|
|
Before calling XNVCTRLSetAttribute(), an NV-CONTROL client should
|
|
use XNVCTRLQueryAttribute() or XNVCTRLQueryValidAttributeValues()
|
|
to determine if the attribute exists on the specified X screen;
|
|
if the attribute does not exist and XNVCTRLSetAttribute()
|
|
is called for that attribute, then a BadValue X protocol error will
|
|
be triggered.
|
|
|
|
|
|
|
|
7. SELECTING EVENT NOTIFICATION
|
|
|
|
NV-CONTROL clients can enable NV-CONTROL events with:
|
|
|
|
Bool XNVCtrlSelectNotify (Display *dpy,
|
|
int screen,
|
|
int type,
|
|
Bool onoff);
|
|
|
|
This function returns True if the extension exists, or False if the
|
|
extension does not exist. The arguments are:
|
|
|
|
dpy - The connection to the X server.
|
|
screen - the X screen on which to enable events.
|
|
type - the type of event to enable; currently, the only NV-CONTROL
|
|
event type is ATTRIBUTE_CHANGED_EVENT.
|
|
onoff - whether to enable (True) or disable (False) receiving
|
|
this event type.
|
|
|
|
This function can cause the following X protocol errors:
|
|
|
|
BadValue - The screen does not exist.
|
|
BadMatch - The NVIDIA driver is not present on that screen.
|
|
|
|
When an NV-CONTROL client changes an integer attribute value, all
|
|
other NV-CONTROL clients with ATTRIBUTE_CHANGED_EVENT notificaion
|
|
enabled will receive an XEvent where XEvent.type is equal to:
|
|
|
|
event_base + ATTRIBUTE_CHANGED_EVENT
|
|
|
|
where event_base is the event base returned by
|
|
XNVCTRLQueryExtension(). The XEvent can then be cast as an
|
|
XNVCtrlAttributeChangedEvent structure:
|
|
|
|
typedef struct {
|
|
int type;
|
|
unsigned long serial;
|
|
Bool send_event; /* always FALSE, we don't allow send_events */
|
|
Display *display;
|
|
Time time;
|
|
int screen;
|
|
unsigned int display_mask;
|
|
unsigned int attribute;
|
|
int value;
|
|
} XNVCtrlAttributeChangedEvent;
|
|
|
|
The screen, display_mask, attribute, and value fields correspond to
|
|
the arguments passed to XNVCTRLSetAttribute().
|
|
|
|
|
|
|
|
8. NV-CONTROL EXTENSION HISTORY
|
|
|
|
1.0 - 1.5 NVIDIA Internal development versions
|
|
1.6 Initial public version
|
|
|