NAME

       drmModeGetResources - retrieve current display configuration information

SYNOPSIS

       #include <xf86drm.h>

       #include <xf86drmMode.h>

       drmModeResPtr drmModeGetResources(int fd);

DESCRIPTION

       drmModeGetResources allocates, populates, and returns a drmModeRes structure containing information about
       the current display configuration. The structure contains the following fields:

          typedef struct _drmModeRes {
              int count_fbs;
              uint32_t *fbs;

              int count_crtcs;
              uint32_t *crtcs;

              int count_connectors;
              uint32_t *connectors;

              int count_encoders;
              uint32_t *encoders;

              uint32_t min_width, max_width;
              uint32_t min_height, max_height;
          } drmModeRes, *drmModeResPtr;

       The  count_fbs  and  fbs  fields  indicate  the  number of currently allocated framebuffer objects (i.e.,
       objects that can be attached to a given CRTC or sprite for display).

       The count_crtcs and crtcs fields list the available CRTCs in the  configuration.  A  CRTC  is  simply  an
       object  that can scan out a framebuffer to a display sink, and contains mode timing and relative position
       information. CRTCs drive encoders, which are responsible for converting the pixel stream into a  specific
       display protocol (e.g., MIPI or HDMI).

       The  count_connectors  and  connectors  fields list the available physical connectors on the system. Note
       that some of these may not be exposed from the chassis (e.g., LVDS or eDP). Connectors  are  attached  to
       encoders  and contain information about the attached display sink (e.g., width and height in mm, subpixel
       ordering, and various other properties).

       The count_encoders and encoders fields list the available encoders on the device.  Each  encoder  may  be
       associated with a CRTC, and may be used to drive a particular encoder.

       The  min_* and max_* fields indicate the maximum size of a framebuffer for this device (i.e., the scanout
       size limit).

RETURN VALUE

       drmModeGetResources returns a drmModeRes structure pointer on success,  NULL  on  failure.  The  returned
       structure must be freed with drmModeFreeResources(3).

REPORTING BUGS

       Bugs in this function should be reported to https://gitlab.freedesktop.org/mesa/drm/-/issues

SEE ALSO

       drm(7),     drm-kms(7),     drmModeGetFB(3),     drmModeAddFB(3),    drmModeAddFB2(3),    drmModeRmFB(3),
       drmModeDirtyFB(3), drmModeGetCrtc(3), drmModeSetCrtc (3), drmModeGetEncoder (3), drmModeGetConnector(3)

                                                 September 2012                           DRMMODEGETRESOURCES(3)