Redesign wlr_texture

- Textures are now immutable (apart from those created from raw
  pixels), no more invalid textures
- Move all wl_drm stuff in wlr_renderer
- Most of wlr_texture fields are now private
- Remove some duplicated DMA-BUF code in the DRM backend
- Add more assertions
- Stride is now always given as bytes rather than pixels
- Drop wl_shm functions

Fun fact: this patch has been written 10,000 meters up in the air.

include/wlr/render/egl.h

@@ -46,37 +46,25 @@ void wlr_egl_finish(struct wlr_egl *egl);
  */
 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);
-
 /**
  * Creates an egl image from the given dmabuf attributes. Check usability
  * of the dmabuf with wlr_egl_check_import_dmabuf once first.
  */
 EGLImageKHR wlr_egl_create_image_from_dmabuf(struct wlr_egl *egl,
-		struct wlr_dmabuf_buffer_attribs *attributes);
+	struct wlr_dmabuf_buffer_attribs *attributes);
 
 /**
  * Try to import the given dmabuf. On success return true false otherwise.
  * If this succeeds the dmabuf can be used for rendering on a texture
  */
 bool wlr_egl_check_import_dmabuf(struct wlr_egl *egl,
-		struct wlr_dmabuf_buffer *dmabuf);
+	struct wlr_dmabuf_buffer *dmabuf);
 
 /**
  * Get the available dmabuf formats