13 files changed, 173 insertions, 18 deletions
diff --git a/include/backend/drm/renderer.h b/include/backend/drm/renderer.h
index 510abe43..575758de 100644
--- a/include/backend/drm/renderer.h
+++ b/include/backend/drm/renderer.h
@@ -52,5 +52,6 @@ struct gbm_bo *get_drm_surface_front(struct wlr_drm_surface *surf);
 void post_drm_surface(struct wlr_drm_surface *surf);
 struct gbm_bo *copy_drm_surface_mgpu(struct wlr_drm_surface *dest,
 	struct gbm_bo *src);
+bool export_drm_bo(struct gbm_bo *bo, struct wlr_dmabuf_attributes *attribs);
 
 #endif
diff --git a/include/render/gles2.h b/include/render/gles2.h
index 99beff29..67d4e9f5 100644
--- a/include/render/gles2.h
+++ b/include/render/gles2.h
@@ -25,6 +25,14 @@ struct wlr_gles2_pixel_format {
 	bool has_alpha;
 };
 
+struct wlr_gles2_tex_shader {
+	GLuint program;
+	GLint proj;
+	GLint invert_y;
+	GLint tex;
+	GLint alpha;
+};
+
 struct wlr_gles2_renderer {
 	struct wlr_renderer wlr_renderer;
 
@@ -32,11 +40,19 @@ struct wlr_gles2_renderer {
 	const char *exts_str;
 
 	struct {
-		GLuint quad;
-		GLuint ellipse;
-		GLuint tex_rgba;
-		GLuint tex_rgbx;
-		GLuint tex_ext;
+		struct {
+			GLuint program;
+			GLint proj;
+			GLint color;
+		} quad;
+		struct {
+			GLuint program;
+			GLint proj;
+			GLint color;
+		} ellipse;
+		struct wlr_gles2_tex_shader tex_rgba;
+		struct wlr_gles2_tex_shader tex_rgbx;
+		struct wlr_gles2_tex_shader tex_ext;
 	} shaders;
 
 	uint32_t viewport_width, viewport_height;
diff --git a/include/rootston/desktop.h b/include/rootston/desktop.h
index bb7d2084..dfe070ca 100644
--- a/include/rootston/desktop.h
+++ b/include/rootston/desktop.h
@@ -45,6 +45,7 @@ struct roots_desktop {
 	struct wlr_xdg_shell *xdg_shell;
 	struct wlr_gamma_control_manager *gamma_control_manager;
 	struct wlr_screenshooter *screenshooter;
+	struct wlr_export_dmabuf_manager_v1 *export_dmabuf_manager_v1;
 	struct wlr_server_decoration_manager *server_decoration_manager;
 	struct wlr_primary_selection_device_manager *primary_selection_device_manager;
 	struct wlr_idle *idle;
diff --git a/include/wlr/backend/session.h b/include/wlr/backend/session.h
index 4d04b363..1cf41939 100644
--- a/include/wlr/backend/session.h
+++ b/include/wlr/backend/session.h
@@ -25,8 +25,12 @@ struct wlr_session {
 	struct wl_signal session_signal;
 	bool active;
 
+	/*
+	 * 0 if virtual terminals are not supported
+	 * i.e. seat != "seat0"
+	 */
 	unsigned vtnr;
-	char seat[8];
+	char seat[256];
 
 	struct udev *udev;
 	struct udev_monitor *mon;
diff --git a/include/wlr/interfaces/wlr_output.h b/include/wlr/interfaces/wlr_output.h
index 7ecc7551..8f87408a 100644
--- a/include/wlr/interfaces/wlr_output.h
+++ b/include/wlr/interfaces/wlr_output.h
@@ -23,6 +23,8 @@ struct wlr_output_impl {
 	void (*set_gamma)(struct wlr_output *output,
 		uint32_t size, uint16_t *r, uint16_t *g, uint16_t *b);
 	uint32_t (*get_gamma_size)(struct wlr_output *output);
+	bool (*export_dmabuf)(struct wlr_output *output,
+		struct wlr_dmabuf_attributes *attribs);
 };
 
 void wlr_output_init(struct wlr_output *output, struct wlr_backend *backend,
diff --git a/include/wlr/render/dmabuf.h b/include/wlr/render/dmabuf.h
index 2e13fe75..78f8c2eb 100644
--- a/include/wlr/render/dmabuf.h
+++ b/include/wlr/render/dmabuf.h
@@ -1,6 +1,8 @@
 #ifndef WLR_RENDER_DMABUF_H
 #define WLR_RENDER_DMABUF_H
 
+#include <stdint.h>
+
 // So we don't have to pull in linux specific drm headers
 #ifndef DRM_FORMAT_MOD_INVALID
 #define DRM_FORMAT_MOD_INVALID ((1ULL<<56) - 1)
@@ -26,4 +28,9 @@ struct wlr_dmabuf_attributes {
 	int fd[WLR_DMABUF_MAX_PLANES];
 };
 
+/**
+ * Closes all file descriptors in the DMA-BUF attributes.
+ */
+void wlr_dmabuf_attributes_finish(struct wlr_dmabuf_attributes *attribs);
+
 #endif
diff --git a/include/wlr/render/egl.h b/include/wlr/render/egl.h
index 0f591d60..6b887f4f 100644
--- a/include/wlr/render/egl.h
+++ b/include/wlr/render/egl.h
@@ -18,9 +18,10 @@ struct wlr_egl {
 	struct {
 		bool bind_wayland_display_wl;
 		bool buffer_age_ext;
-		bool image_dmabuf_import_modifiers_ext;
-		bool image_dmabuf_import_ext;
 		bool image_base_khr;
+		bool image_dma_buf_export_mesa;
+		bool image_dmabuf_import_ext;
+		bool image_dmabuf_import_modifiers_ext;
 		bool swap_buffers_with_damage_ext;
 		bool swap_buffers_with_damage_khr;
 	} exts;
@@ -80,6 +81,10 @@ int wlr_egl_get_dmabuf_formats(struct wlr_egl *egl, int **formats);
 int wlr_egl_get_dmabuf_modifiers(struct wlr_egl *egl, int format,
 	uint64_t **modifiers);
 
+bool wlr_egl_export_image_to_dmabuf(struct wlr_egl *egl, EGLImageKHR image,
+	int32_t width, int32_t height, uint32_t flags,
+	struct wlr_dmabuf_attributes *attribs);
+
 /**
  * Destroys an EGL image created with the given wlr_egl.
  */
diff --git a/include/wlr/render/interface.h b/include/wlr/render/interface.h
index 80788858..fb427c89 100644
--- a/include/wlr/render/interface.h
+++ b/include/wlr/render/interface.h
@@ -60,6 +60,8 @@ struct wlr_texture_impl {
 		enum wl_shm_format wl_fmt, uint32_t stride, uint32_t width,
 		uint32_t height, uint32_t src_x, uint32_t src_y, uint32_t dst_x,
 		uint32_t dst_y, const void *data);
+	bool (*to_dmabuf)(struct wlr_texture *texture,
+		struct wlr_dmabuf_attributes *attribs);
 	void (*destroy)(struct wlr_texture *texture);
 };
 
diff --git a/include/wlr/render/wlr_texture.h b/include/wlr/render/wlr_texture.h
index c1633820..785f4fc6 100644
--- a/include/wlr/render/wlr_texture.h
+++ b/include/wlr/render/wlr_texture.h
@@ -48,6 +48,9 @@ bool wlr_texture_write_pixels(struct wlr_texture *texture,
 	uint32_t src_x, uint32_t src_y, uint32_t dst_x, uint32_t dst_y,
 	const void *data);
 
+bool wlr_texture_to_dmabuf(struct wlr_texture *texture,
+	struct wlr_dmabuf_attributes *attribs);
+
 /**
  * Destroys this wlr_texture.
  */
diff --git a/include/wlr/types/wlr_buffer.h b/include/wlr/types/wlr_buffer.h
new file mode 100644
index 00000000..eabc8b51
--- /dev/null
+++ b/include/wlr/types/wlr_buffer.h
@@ -0,0 +1,63 @@
+#ifndef WLR_TYPES_WLR_BUFFER_H
+#define WLR_TYPES_WLR_BUFFER_H
+
+#include <pixman.h>
+#include <wayland-server.h>
+
+/**
+ * A client buffer.
+ */
+struct wlr_buffer {
+	/**
+	 * The buffer resource, if any. Will be NULL if the client destroys it.
+	 */
+	struct wl_resource *resource;
+	/**
+	 * The buffer's texture, if any. A buffer will not have a texture if the
+	 * client destroys the buffer before it has been released.
+	 */
+	struct wlr_texture *texture;
+	bool released;
+	size_t n_refs;
+
+	struct wl_listener resource_destroy;
+};
+
+struct wlr_renderer;
+
+/**
+ * Check if a resource is a wl_buffer resource.
+ */
+bool wlr_resource_is_buffer(struct wl_resource *resource);
+/**
+ * Get the size of a wl_buffer resource.
+ */
+bool wlr_buffer_get_resource_size(struct wl_resource *resource,
+	struct wlr_renderer *renderer, int *width, int *height);
+
+/**
+ * Upload a buffer to the GPU and reference it.
+ */
+struct wlr_buffer *wlr_buffer_create(struct wlr_renderer *renderer,
+	struct wl_resource *resource);
+/**
+ * Reference the buffer.
+ */
+struct wlr_buffer *wlr_buffer_ref(struct wlr_buffer *buffer);
+/**
+ * Unreference the buffer. After this call, `buffer` may not be accessed
+ * anymore.
+ */
+void wlr_buffer_unref(struct wlr_buffer *buffer);
+/**
+ * Try to update the buffer's content. On success, returns the updated buffer
+ * and destroys the provided `buffer`. On error, `buffer` is intact and NULL is
+ * returned.
+ *
+ * Fails if there's more than one reference to the buffer or if the texture
+ * isn't mutable.
+ */
+struct wlr_buffer *wlr_buffer_apply_damage(struct wlr_buffer *buffer,
+	struct wl_resource *resource, pixman_region32_t *damage);
+
+#endif
diff --git a/include/wlr/types/wlr_export_dmabuf_v1.h b/include/wlr/types/wlr_export_dmabuf_v1.h
new file mode 100644
index 00000000..a094b3de
--- /dev/null
+++ b/include/wlr/types/wlr_export_dmabuf_v1.h
@@ -0,0 +1,37 @@
+#ifndef WLR_TYPES_WLR_EXPORT_DMABUF_V1_H
+#define WLR_TYPES_WLR_EXPORT_DMABUF_V1_H
+
+#include <wayland-server.h>
+#include <wlr/render/dmabuf.h>
+
+struct wlr_export_dmabuf_manager_v1;
+
+struct wlr_export_dmabuf_frame_v1 {
+	struct wl_resource *resource;
+	struct wlr_export_dmabuf_manager_v1 *manager;
+	struct wl_list link;
+
+	struct wlr_dmabuf_attributes attribs;
+	struct wlr_output *output;
+
+	struct wl_listener output_swap_buffers;
+};
+
+struct wlr_export_dmabuf_manager_v1 {
+	struct wl_global *global;
+	struct wl_list resources;
+	struct wl_list frames;
+
+	struct wl_listener display_destroy;
+
+	struct {
+		struct wl_signal destroy;
+	} events;
+};
+
+struct wlr_export_dmabuf_manager_v1 *wlr_export_dmabuf_manager_v1_create(
+	struct wl_display *display);
+void wlr_export_dmabuf_manager_v1_destroy(
+	struct wlr_export_dmabuf_manager_v1 *manager);
+
+#endif
diff --git a/include/wlr/types/wlr_output.h b/include/wlr/types/wlr_output.h
index cef3fc5d..158d174e 100644
--- a/include/wlr/types/wlr_output.h
+++ b/include/wlr/types/wlr_output.h
@@ -6,6 +6,7 @@
 #include <time.h>
 #include <wayland-server.h>
 #include <wayland-util.h>
+#include <wlr/types/wlr_linux_dmabuf.h>
 
 struct wlr_output_mode {
 	uint32_t flags; // enum wl_output_mode
@@ -81,7 +82,7 @@ struct wlr_output {
 	struct {
 		struct wl_signal frame;
 		struct wl_signal needs_swap;
-		struct wl_signal swap_buffers;
+		struct wl_signal swap_buffers; // wlr_output_event_swap_buffers
 		struct wl_signal enable;
 		struct wl_signal mode;
 		struct wl_signal scale;
@@ -107,6 +108,12 @@ struct wlr_output {
 	void *data;
 };
 
+struct wlr_output_event_swap_buffers {
+	struct wlr_output *output;
+	struct timespec *when;
+	pixman_region32_t *damage;
+};
+
 struct wlr_surface;
 
 void wlr_output_enable(struct wlr_output *output, bool enable);
@@ -162,6 +169,8 @@ void wlr_output_schedule_frame(struct wlr_output *output);
 void wlr_output_set_gamma(struct wlr_output *output,
 	uint32_t size, uint16_t *r, uint16_t *g, uint16_t *b);
 uint32_t wlr_output_get_gamma_size(struct wlr_output *output);
+bool wlr_output_export_dmabuf(struct wlr_output *output,
+	struct wlr_dmabuf_attributes *attribs);
 void wlr_output_set_fullscreen_surface(struct wlr_output *output,
 	struct wlr_surface *surface);
 struct wlr_output *wlr_output_from_resource(struct wl_resource *resource);
diff --git a/include/wlr/types/wlr_surface.h b/include/wlr/types/wlr_surface.h
index 526e4e2c..46588f0a 100644
--- a/include/wlr/types/wlr_surface.h
+++ b/include/wlr/types/wlr_surface.h
@@ -8,11 +8,6 @@
 #include <wayland-server.h>
 #include <wlr/types/wlr_output.h>
 
-struct wlr_frame_callback {
-	struct wl_resource *resource;
-	struct wl_list link;
-};
-
 #define WLR_SURFACE_INVALID_BUFFER 1
 #define WLR_SURFACE_INVALID_SURFACE_DAMAGE 2
 #define WLR_SURFACE_INVALID_BUFFER_DAMAGE 4
@@ -69,13 +64,16 @@ struct wlr_subsurface {
 struct wlr_surface {
 	struct wl_resource *resource;
 	struct wlr_renderer *renderer;
-	struct wlr_texture *texture;
+	/**
+	 * The surface's buffer, if any. A surface has an attached buffer when it
+	 * commits with a non-null buffer in its pending state. A surface will not
+	 * have a buffer if it has never committed one, has committed a null buffer,
+	 * or something went wrong with uploading the buffer.
+	 */
+	struct wlr_buffer *buffer;
 	struct wlr_surface_state *current, *pending;
 	const char *role; // the lifetime-bound role or null
 
-	float buffer_to_surface_matrix[9];
-	float surface_to_buffer_matrix[9];
-
 	struct {
 		struct wl_signal commit;
 		struct wl_signal new_subsurface;
@@ -125,6 +123,13 @@ int wlr_surface_set_role(struct wlr_surface *surface, const char *role,
 bool wlr_surface_has_buffer(struct wlr_surface *surface);
 
 /**
+ * Get the texture of the buffer currently attached to this surface. Returns
+ * NULL if no buffer is currently attached or if something went wrong with
+ * uploading the buffer.
+ */
+struct wlr_texture *wlr_surface_get_texture(struct wlr_surface *surface);
+
+/**
  * Create a new subsurface resource with the provided new ID. If `resource_list`
  * is non-NULL, adds the subsurface's resource to the list.
  */