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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 struc- ture 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 configura- tion. A CRTC is simply an object that can scan out a framebuffer to a dis- play 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 con- nectors 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 con- tain 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 drmModeFreeRe- sources(3). REPORTING BUGS Bugs in this function should be reported to <https://gitlab.freedesktop.org/mesa/libdrm/-/issues> SEE ALSO drm(7), drm-kms(7), drmModeGetFB(3), drmModeAddFB(3), drmModeAddFB2(3), dr- mModeRmFB(3), drmModeDirtyFB(3), drmModeGetCrtc(3), drmModeSetCrtc (3), dr- mModeGetEncoder (3), drmModeGetConnector(3) September 2012 DRMMODEGETRESOURCES(3)
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | REPORTING BUGS | SEE ALSO
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