📒 笔记文档

int main(int argc, char **argv)
{
	/* open the drm device */
	open("/dev/dri/card0");

	/* get crtc/encoder/connector id */
	drmModeGetResources(...);

	/* get connector for display mode */
	drmModeGetConnector(...);

	/* create a dumb-buffer */
	drmIoctl(DRM_IOCTL_MODE_CREATE_DUMB);

	/* bind the dumb-buffer to an FB object */
	drmModeAddFB(...);

	/* map the dumb buffer for userspace drawing */
	drmIoctl(DRM_IOCTL_MODE_MAP_DUMB);
	mmap(...);

	/* start display */
	drmModeSetCrtc(crtc_id, fb_id, connector_id, mode);
}