render: introduce wlr_renderer_bind_buffer

include/render/wlr_renderer.h

@@ -0,0 +1,8 @@
+#ifndef RENDER_WLR_RENDERER_H
+#define RENDER_WLR_RENDERER_H
+
+#include <wlr/render/wlr_renderer.h>
+
+bool wlr_renderer_bind_buffer(struct wlr_renderer *r, struct wlr_buffer *buffer);
+
+#endif

include/wlr/render/interface.h

@@ -30,6 +30,8 @@
 #include <wlr/render/dmabuf.h>
 
 struct wlr_renderer_impl {
+	bool (*bind_buffer)(struct wlr_renderer *renderer,
+		struct wlr_buffer *buffer);
 	void (*begin)(struct wlr_renderer *renderer, uint32_t width,
 		uint32_t height);
 	void (*end)(struct wlr_renderer *renderer);

include/wlr/render/wlr_renderer.h

@@ -21,6 +21,7 @@ enum wlr_renderer_read_pixels_flags {
 
 struct wlr_renderer_impl;
 struct wlr_drm_format_set;
+struct wlr_buffer;
 
 struct wlr_renderer {
 	const struct wlr_renderer_impl *impl;

render/wlr_renderer.c

@@ -7,6 +7,7 @@
 #include <wlr/types/wlr_matrix.h>
 #include <wlr/util/log.h>
 #include "util/signal.h"
+#include "render/wlr_renderer.h"
 
 void wlr_renderer_init(struct wlr_renderer *renderer,
 		const struct wlr_renderer_impl *impl) {
@@ -37,6 +38,15 @@ void wlr_renderer_destroy(struct wlr_renderer *r) {
 	}
 }
 
+bool wlr_renderer_bind_buffer(struct wlr_renderer *r,
+		struct wlr_buffer *buffer) {
+	assert(!r->rendering);
+	if (!r->impl->bind_buffer) {
+		return false;
+	}
+	return r->impl->bind_buffer(r, buffer);
+}
+
 void wlr_renderer_begin(struct wlr_renderer *r, uint32_t width, uint32_t height) {
 	assert(!r->rendering);