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DRMMODEGETRESOURCES(3)     Direct Rendering Manager     DRMMODEGETRESOURCES(3)


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)

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