Add a stub wl_drm implementation

This will allow us to remove all of our EGL wl_drm support code
and remove some weird stuff we need just for wl_drm support. In
particular, wl_drm buffers coming from the EGL implementation
can't easily be wrapped into a wlr_buffer properly.
This commit is contained in:
Simon Ser 2021-02-02 16:06:43 +01:00 committed by Simon Zeni
parent 78121ad2d8
commit f7e3d325fe
3 changed files with 165 additions and 0 deletions

View File

@ -0,0 +1,36 @@
/*
* This an unstable interface of wlroots. No guarantees are made regarding the
* future consistency of this API.
*/
#ifndef WLR_USE_UNSTABLE
#error "Add -DWLR_USE_UNSTABLE to enable unstable wlroots features"
#endif
#ifndef WLR_TYPES_WLR_DRM_H
#define WLR_TYPES_WLR_DRM_H
#include <wayland-server-protocol.h>
struct wlr_renderer;
/**
* A stub implementation of Mesa's wl_drm protocol.
*
* It only implements the minimum necessary for modern clients to behave
* properly. In particular, flink handles are left unimplemented.
*/
struct wlr_drm {
struct wl_global *global;
char *node_name;
struct {
struct wl_signal destroy;
} events;
struct wl_listener display_destroy;
};
struct wlr_drm *wlr_drm_create(struct wl_display *display,
struct wlr_renderer *renderer);
#endif

View File

@ -21,6 +21,7 @@ wlr_files += files(
'wlr_compositor.c',
'wlr_cursor.c',
'wlr_data_control_v1.c',
'wlr_drm.c',
'wlr_export_dmabuf_v1.c',
'wlr_foreign_toplevel_management_v1.c',
'wlr_fullscreen_shell_v1.c',

128
types/wlr_drm.c Normal file
View File

@ -0,0 +1,128 @@
#define _POSIX_C_SOURCE 200809L
#include <assert.h>
#include <stdlib.h>
#include <unistd.h>
#include <xf86drm.h>
#include <wlr/render/wlr_renderer.h>
#include <wlr/types/wlr_drm.h>
#include <wlr/util/log.h>
#include "drm-protocol.h"
#include "util/signal.h"
#define WLR_DRM_VERSION 2
static void drm_handle_authenticate(struct wl_client *client,
struct wl_resource *resource, uint32_t id) {
// We only use render nodes, which don't need authentication
wl_drm_send_authenticated(resource);
}
static void drm_handle_create_buffer(struct wl_client *client,
struct wl_resource *resource, uint32_t id, uint32_t name, int32_t width,
int32_t height, uint32_t stride, uint32_t format) {
wl_resource_post_error(resource, WL_DRM_ERROR_INVALID_NAME,
"Flink handles are not supported, use DMA-BUF instead");
}
static void drm_handle_create_planar_buffer(struct wl_client *client,
struct wl_resource *resource, uint32_t id, uint32_t name, int32_t width,
int32_t height, uint32_t format, int32_t offset0, int32_t stride0,
int32_t offset1, int32_t stride1, int32_t offset2, int32_t stride2) {
wl_resource_post_error(resource, WL_DRM_ERROR_INVALID_NAME,
"Flink handles are not supported, use DMA-BUF instead");
}
static void drm_handle_create_prime_buffer(struct wl_client *client,
struct wl_resource *resource, uint32_t id, int fd, int32_t width,
int32_t height, uint32_t format, int32_t offset0, int32_t stride0,
int32_t offset1, int32_t stride1, int32_t offset2, int32_t stride2) {
close(fd);
wl_resource_post_error(resource, WL_DRM_ERROR_INVALID_NAME,
"DMA-BUF imports via wl_drm are not supported, use linux-dmabuf instead");
}
static const struct wl_drm_interface drm_impl = {
.authenticate = drm_handle_authenticate,
.create_buffer = drm_handle_create_buffer,
.create_planar_buffer = drm_handle_create_planar_buffer,
.create_prime_buffer = drm_handle_create_prime_buffer,
};
static void drm_bind(struct wl_client *client, void *data,
uint32_t version, uint32_t id) {
struct wlr_drm *drm = data;
struct wl_resource *resource = wl_resource_create(client,
&wl_drm_interface, version, id);
if (resource == NULL) {
wl_client_post_no_memory(client);
return;
}
wl_resource_set_implementation(resource, &drm_impl, drm, NULL);
wl_drm_send_device(resource, drm->node_name);
wl_drm_send_capabilities(resource, WL_DRM_CAPABILITY_PRIME);
}
static void handle_display_destroy(struct wl_listener *listener, void *data) {
struct wlr_drm *drm = wl_container_of(listener, drm, display_destroy);
wlr_signal_emit_safe(&drm->events.destroy, NULL);
wl_list_remove(&drm->display_destroy.link);
free(drm->node_name);
wl_global_destroy(drm->global);
free(drm);
}
struct wlr_drm *wlr_drm_create(struct wl_display *display,
struct wlr_renderer *renderer) {
int drm_fd = wlr_renderer_get_drm_fd(renderer);
if (drm_fd < 0) {
wlr_log(WLR_ERROR, "Failed to get DRM FD from renderer");
return NULL;
}
drmDevice *dev = NULL;
if (drmGetDevice2(drm_fd, 0, &dev) != 0) {
wlr_log(WLR_ERROR, "drmGetDevice2 failed");
return NULL;
}
char *node_name = NULL;
if (dev->available_nodes & (1 << DRM_NODE_RENDER)) {
node_name = strdup(dev->nodes[DRM_NODE_RENDER]);
} else {
assert(dev->available_nodes & (1 << DRM_NODE_PRIMARY));
wlr_log(WLR_DEBUG, "No DRM render node available, "
"falling back to primary node '%s'", dev->nodes[DRM_NODE_PRIMARY]);
node_name = strdup(dev->nodes[DRM_NODE_PRIMARY]);
}
drmFreeDevice(&dev);
if (node_name == NULL) {
return NULL;
}
struct wlr_drm *drm = calloc(1, sizeof(*drm));
if (drm == NULL) {
free(node_name);
return NULL;
}
drm->node_name = node_name;
wl_signal_init(&drm->events.destroy);
drm->global = wl_global_create(display, &wl_drm_interface, WLR_DRM_VERSION,
drm, drm_bind);
if (drm->global == NULL) {
free(drm->node_name);
free(drm);
return NULL;
}
drm->display_destroy.notify = handle_display_destroy;
wl_display_add_destroy_listener(display, &drm->display_destroy);
return drm;
}