Refactor EGL handling

include/wlr/backend.h

@@ -3,6 +3,7 @@
 
 #include <wayland-server.h>
 #include <wlr/backend/session.h>
+#include <wlr/egl.h>
 
 struct wlr_backend_impl;
 struct wlr_backend_state;
@@ -22,5 +23,6 @@ struct wlr_backend {
 struct wlr_backend *wlr_backend_autocreate(struct wl_display *display);
 bool wlr_backend_init(struct wlr_backend *backend);
 void wlr_backend_destroy(struct wlr_backend *backend);
+struct wlr_egl *wlr_backend_get_egl(struct wlr_backend *backend);
 
 #endif

include/wlr/backend/interface.h

@@ -3,12 +3,14 @@
 
 #include <stdbool.h>
 #include <wlr/backend.h>
+#include <wlr/egl.h>
 
 struct wlr_backend_state;
 
 struct wlr_backend_impl {
 	bool (*init)(struct wlr_backend_state *state);
 	void (*destroy)(struct wlr_backend_state *state);
+	struct wlr_egl *(*get_egl)(struct wlr_backend_state *state);
 };
 
 struct wlr_backend *wlr_backend_create(const struct wlr_backend_impl *impl,

include/wlr/egl.h

@@ -0,0 +1,75 @@
+#ifndef WLR_EGL_H
+#define WLR_EGL_H
+
+#include <EGL/egl.h>
+#include <EGL/eglext.h>
+#include <stdbool.h>
+
+struct wlr_egl {
+	EGLDisplay display;
+	EGLConfig config;
+	EGLContext context;
+
+	PFNEGLGETPLATFORMDISPLAYEXTPROC get_platform_display;
+	PFNEGLCREATEPLATFORMWINDOWSURFACEEXTPROC create_platform_window_surface;
+
+	PFNEGLCREATEIMAGEKHRPROC eglCreateImageKHR;
+	PFNEGLDESTROYIMAGEKHRPROC eglDestroyImageKHR;
+	PFNEGLQUERYWAYLANDBUFFERWL eglQueryWaylandBufferWL;
+	PFNEGLBINDWAYLANDDISPLAYWL eglBindWaylandDisplayWL;
+	PFNEGLUNBINDWAYLANDDISPLAYWL eglUnbindWaylandDisplayWL;
+
+	const char *egl_exts;
+	const char *gl_exts;
+
+	struct wl_display *wl_display;
+};
+
+// TODO: Allocate and return a wlr_egl
+/**
+ *  Initializes an egl context for the given platform and remote display.
+ * Will attempt to load all possibly required api functions.
+ */
+bool wlr_egl_init(struct wlr_egl *egl, EGLenum platform, void *display);
+
+/**
+ * Frees all related egl resources, makes the context not-current and
+ * unbinds a bound wayland display.
+ */
+void wlr_egl_free(struct wlr_egl *egl);
+
+/**
+ * Binds the given display to the egl instance.
+ * This will allow clients to create egl surfaces from wayland ones and render to it.
+ */
+bool wlr_egl_bind_display(struct wlr_egl *egl, struct wl_display *local_display);
+
+/**
+ * Refer to the eglQueryWaylandBufferWL extension function.
+ */
+bool wlr_egl_query_buffer(struct wlr_egl *egl, struct wl_resource *buf,
+	EGLint attrib, EGLint *value);
+
+/**
+ * Returns a surface for the given native window
+ * The window must match the remote display the wlr_egl was created with.
+ */
+EGLSurface wlr_egl_create_surface(struct wlr_egl *egl, void *window);
+
+/**
+ * Creates an egl image from the given client buffer and attributes.
+ */
+EGLImageKHR wlr_egl_create_image(struct wlr_egl *egl,
+		EGLenum target, EGLClientBuffer buffer, const EGLint *attribs);
+
+/**
+ * Destroys an egl image created with the given wlr_egl.
+ */
+bool wlr_egl_destroy_image(struct wlr_egl *egl, EGLImageKHR image);
+
+/**
+ * Returns a string for the last error ocurred with egl.
+ */
+const char *egl_error(void);
+
+#endif

include/wlr/render.h

@@ -43,6 +43,11 @@ void wlr_render_colored_ellipse(struct wlr_renderer *r,
  */
 const enum wl_shm_format *wlr_renderer_get_formats(
 		struct wlr_renderer *r, size_t *len);
+/**
+ * Returns true if this wl_buffer is a DRM buffer.
+ */
+bool wlr_renderer_buffer_is_drm(struct wlr_renderer *renderer,
+		struct wl_resource *buffer);
 /**
  * Destroys this wlr_renderer. Textures must be destroyed separately.
  */

include/wlr/render/gles2.h

@@ -1,8 +1,9 @@
 #ifndef _WLR_GLES2_RENDERER_H
 #define _WLR_GLES2_RENDERER_H
 #include <wlr/render.h>
+#include <wlr/backend.h>
 
 struct wlr_egl;
-struct wlr_renderer *wlr_gles2_renderer_init();
+struct wlr_renderer *wlr_gles2_renderer_init(struct wlr_backend *backend);
 
 #endif

include/wlr/render/interface.h

@@ -25,6 +25,8 @@ struct wlr_renderer_impl {
 		const float (*color)[4], const float (*matrix)[16]);
 	const enum wl_shm_format *(*formats)(
 		struct wlr_renderer_state *state, size_t *len);
+	bool (*buffer_is_drm)(struct wlr_renderer_state *state,
+		struct wl_resource *buffer);
 	void (*destroy)(struct wlr_renderer_state *state);
 };
 

include/wlr/types/wlr_surface.h

@@ -29,6 +29,7 @@ struct wlr_surface_state {
 
 struct wlr_surface {
 	struct wl_resource *resource;
+	struct wlr_renderer *renderer;
 	struct wlr_texture *texture;
 	struct wlr_surface_state current, pending;
 	const char *role; // the lifetime-bound role or null