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://bugs.freedesktop.org/enter_bug.cgi?product=DRI&component=libdrm under the "DRI"
       product, component "libdrm"

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)