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weston/libweston/linux-dmabuf.h

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/*
* Copyright © 2014, 2015 Collabora, Ltd.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef WESTON_LINUX_DMABUF_H
#define WESTON_LINUX_DMABUF_H
#include <stdint.h>
#define MAX_DMABUF_PLANES 4
struct linux_dmabuf_buffer;
typedef void (*dmabuf_user_data_destroy_func)(
struct linux_dmabuf_buffer *buffer);
struct dmabuf_attributes {
int32_t width;
int32_t height;
uint32_t format;
uint32_t flags; /* enum zlinux_buffer_params_flags */
int n_planes;
int fd[MAX_DMABUF_PLANES];
uint32_t offset[MAX_DMABUF_PLANES];
uint32_t stride[MAX_DMABUF_PLANES];
uint64_t modifier[MAX_DMABUF_PLANES];
};
struct linux_dmabuf_buffer {
struct wl_resource *buffer_resource;
struct wl_resource *params_resource;
struct weston_compositor *compositor;
struct dmabuf_attributes attributes;
void *user_data;
dmabuf_user_data_destroy_func user_data_destroy_func;
/* XXX:
*
* Add backend private data. This would be for the backend
* to do all additional imports it might ever use in advance.
* The basic principle, even if not implemented in drivers today,
* is that dmabufs are first attached, but the actual allocation
* is deferred to first use. This would allow the exporter and all
* attachers to agree on how to allocate.
*
* The DRM backend would use this to create drmFBs for each
* dmabuf_buffer, just in case at some point it would become
* feasible to scan it out directly. This would improve the
* possibilities to successfully scan out, avoiding compositing.
*/
/**< marked as scan-out capable, avoids any composition */
bool direct_display;
};
enum weston_dmabuf_feedback_tranche_preference {
RENDERER_PREF = 0,
SCANOUT_PREF = 1
};
struct weston_dmabuf_feedback_format_table {
int fd;
unsigned int size;
/* This is a pointer to the region of memory where we mapped the file
* that clients receive. We fill it with the format/modifier pairs
* supported by the renderer. We don't formats not supported by the
* renderer in the table, as we must always be able to fallback to the
* renderer if direct scanout fails. */
struct {
uint32_t format;
uint32_t pad; /* unused */
uint64_t modifier;
} *data;
/* Indices of the renderer formats in the table. As the table consists
* of formats supported by the renderer, this goes from 0 to the number
* of pairs in the table. */
struct wl_array renderer_formats_indices;
/* Indices of the scanout formats (union of KMS plane's supported
* formats intersected with the renderer formats). */
struct wl_array scanout_formats_indices;
};
struct weston_dmabuf_feedback {
/* We can have multiple clients subscribing to the same surface dma-buf
* feedback. As they are dynamic and we need to re-send them multiple
* times during Weston's lifetime, we need to keep track of the
* resources of each client. In the case of the default feedback this is
* not necessary, as we only advertise them when clients subscribe. IOW,
* default feedback events are never re-sent. */
struct wl_list resource_list;
dev_t main_device;
/* weston_dmabuf_feedback_tranche::link */
struct wl_list tranche_list;
/* We use this timer to know if the scene has stabilized and that would
* be useful to resend dma-buf feedback events to clients. Consider the
* timer off when action_needed == ACTION_NEEDED_NONE. See enum
* actions_needed_dmabuf_feedback. */
struct timespec timer;
uint32_t action_needed;
};
struct weston_dmabuf_feedback_tranche {
/* weston_dmabuf_feedback::tranche_list */
struct wl_list link;
/* Instead of destroying tranches and reconstructing them when necessary
* (it can be expensive), we have this flag to know if the tranche
* should be advertised or not. This is particularly useful for the
* scanout tranche, as based on the DRM-backend feedback and the current
* scene (which changes a lot during compositor lifetime) we can decide
* to send it or not. */
bool active;
dev_t target_device;
uint32_t flags;
enum weston_dmabuf_feedback_tranche_preference preference;
struct wl_array formats_indices;
};
int
linux_dmabuf_setup(struct weston_compositor *compositor);
int
weston_direct_display_setup(struct weston_compositor *compositor);
struct linux_dmabuf_buffer *
linux_dmabuf_buffer_get(struct wl_resource *resource);
void
linux_dmabuf_buffer_set_user_data(struct linux_dmabuf_buffer *buffer,
void *data,
dmabuf_user_data_destroy_func func);
void *
linux_dmabuf_buffer_get_user_data(struct linux_dmabuf_buffer *buffer);
void
linux_dmabuf_buffer_send_server_error(struct linux_dmabuf_buffer *buffer,
const char *msg);
struct weston_dmabuf_feedback *
weston_dmabuf_feedback_create(dev_t main_device);
void
weston_dmabuf_feedback_destroy(struct weston_dmabuf_feedback *dmabuf_feedback);
void
weston_dmabuf_feedback_send_all(struct weston_dmabuf_feedback *dmabuf_feedback,
struct weston_dmabuf_feedback_format_table *format_table);
struct weston_dmabuf_feedback_tranche *
weston_dmabuf_feedback_find_tranche(struct weston_dmabuf_feedback *dmabuf_feedback,
dev_t target_device, uint32_t flags,
enum weston_dmabuf_feedback_tranche_preference preference);
struct weston_dmabuf_feedback_format_table *
weston_dmabuf_feedback_format_table_create(const struct weston_drm_format_array *renderer_formats);
void
weston_dmabuf_feedback_format_table_destroy(struct weston_dmabuf_feedback_format_table *format_table);
int
weston_dmabuf_feedback_format_table_set_scanout_indices(struct weston_dmabuf_feedback_format_table *format_table,
const struct weston_drm_format_array *scanout_formats);
struct weston_dmabuf_feedback_tranche *
weston_dmabuf_feedback_tranche_create(struct weston_dmabuf_feedback *dmabuf_feedback,
struct weston_dmabuf_feedback_format_table *format_table,
dev_t target_device, uint32_t flags,
enum weston_dmabuf_feedback_tranche_preference preference);
#endif /* WESTON_LINUX_DMABUF_H */