wlroots/include/backend/drm/drm.h

#ifndef DRM_H
#define DRM_H

#include <stdbool.h>
#include <stdint.h>
#include <xf86drmMode.h>
#include <EGL/egl.h>
#include <gbm.h>

struct wlr_drm_renderer {
	int fd;

	// Currently here so that rendering has access to the event queue.
	// Ideally this is will be removed later once the way events are
	// handled is changed.
	struct wlr_drm_backend *backend;

	struct gbm_device *gbm;
	struct {
		EGLDisplay disp;
		EGLConfig conf;
		EGLContext context;
	} egl;
};

bool wlr_drm_renderer_init(struct wlr_drm_renderer *renderer,
		struct wlr_drm_backend *backend, int fd);
void wlr_drm_renderer_free(struct wlr_drm_renderer *renderer);

enum wlr_drm_display_state {
	DRM_DISP_INVALID,
	DRM_DISP_DISCONNECTED,
	DRM_DISP_NEEDS_MODESET,
	DRM_DISP_CONNECTED,
};

struct wlr_drm_display {
	enum wlr_drm_display_state state;
	uint32_t connector;
	char name[16];

	size_t num_modes;
	drmModeModeInfo *modes;
	drmModeModeInfo *active_mode;

	uint32_t width;
	uint32_t height;

	uint32_t crtc;
	drmModeCrtc *old_crtc;

	struct wlr_drm_renderer *renderer;
	struct gbm_surface *gbm;
	EGLSurface *egl;

	bool pageflip_pending;
	bool cleanup;
};

bool wlr_drm_display_modeset(struct wlr_drm_backend *backend,
		struct wlr_drm_display *disp, const char *str);
void wlr_drm_display_free(struct wlr_drm_display *disp, bool restore);

void wlr_drm_display_begin(struct wlr_drm_display *disp);
void wlr_drm_display_end(struct wlr_drm_display *disp);

void wlr_drm_scan_connectors(struct wlr_drm_backend *backend);
void wlr_drm_event(int fd);

#endif