[Mesa-dev] [PATCH 06/14] vl/dri3: add back buffers support
Leo Liu
leo.liu at amd.com
Wed May 11 15:06:28 UTC 2016
This implements DRI3 PixmapFromBuffer. Create buffer objects, and
associate it to a dma-buf fd, and then pass this fd with a pixmap
ID to X server for creating pixmap object; also add a function
for wait events.
Signed-off-by: Leo Liu <leo.liu at amd.com>
---
src/gallium/auxiliary/vl/vl_winsys_dri3.c | 187 +++++++++++++++++++++++++++++-
1 file changed, 185 insertions(+), 2 deletions(-)
diff --git a/src/gallium/auxiliary/vl/vl_winsys_dri3.c b/src/gallium/auxiliary/vl/vl_winsys_dri3.c
index ef80730..e78ca07 100644
--- a/src/gallium/auxiliary/vl/vl_winsys_dri3.c
+++ b/src/gallium/auxiliary/vl/vl_winsys_dri3.c
@@ -28,17 +28,35 @@
#include <fcntl.h>
#include <X11/Xlib-xcb.h>
+#include <X11/xshmfence.h>
#include <xcb/dri3.h>
#include <xcb/present.h>
#include "loader.h"
#include "pipe/p_screen.h"
+#include "pipe/p_state.h"
#include "pipe-loader/pipe_loader.h"
#include "util/u_memory.h"
+#include "util/u_inlines.h"
+
#include "vl/vl_winsys.h"
+#define BACK_BUFFER_NUM 3
+
+struct vl_dri3_buffer
+{
+ struct pipe_resource *texture;
+
+ uint32_t pixmap;
+ uint32_t sync_fence;
+ struct xshmfence *shm_fence;
+
+ bool busy;
+ uint32_t width, height, pitch;
+};
+
struct vl_dri3_screen
{
struct vl_screen base;
@@ -48,9 +66,23 @@ struct vl_dri3_screen
uint32_t width, height, depth;
xcb_special_event_t *special_event;
+
+ struct vl_dri3_buffer *back_buffers[BACK_BUFFER_NUM];
+ int cur_back;
};
static void
+dri3_free_back_buffer(struct vl_dri3_screen *scrn,
+ struct vl_dri3_buffer *buffer)
+{
+ xcb_free_pixmap(scrn->conn, buffer->pixmap);
+ xcb_sync_destroy_fence(scrn->conn, buffer->sync_fence);
+ xshmfence_unmap_shm(buffer->shm_fence);
+ pipe_resource_reference(&buffer->texture, NULL);
+ FREE(buffer);
+}
+
+static void
dri3_handle_present_event(struct vl_dri3_screen *scrn,
xcb_present_generic_event_t *ge)
{
@@ -83,6 +115,145 @@ dri3_flush_present_events(struct vl_dri3_screen *scrn)
}
static bool
+dri3_wait_present_events(struct vl_dri3_screen *scrn)
+{
+ if (scrn->special_event) {
+ xcb_generic_event_t *ev;
+ ev = xcb_wait_for_special_event(scrn->conn, scrn->special_event);
+ if (!ev)
+ return false;
+ dri3_handle_present_event(scrn, (xcb_present_generic_event_t *)ev);
+ return true;
+ }
+ return false;
+}
+
+static int
+dri3_find_back(struct vl_dri3_screen *scrn)
+{
+ int b;
+
+ for (;;) {
+ for (b = 0; b < BACK_BUFFER_NUM; b++) {
+ int id = (b + scrn->cur_back) % BACK_BUFFER_NUM;
+ struct vl_dri3_buffer *buffer = scrn->back_buffers[id];
+ if (!buffer || !buffer->busy)
+ return id;
+ }
+ xcb_flush(scrn->conn);
+ if (!dri3_wait_present_events(scrn))
+ return -1;
+ }
+}
+
+static struct vl_dri3_buffer *
+dri3_alloc_back_buffer(struct vl_dri3_screen *scrn)
+{
+ struct vl_dri3_buffer *buffer;
+ xcb_pixmap_t pixmap;
+ xcb_sync_fence_t sync_fence;
+ struct xshmfence *shm_fence;
+ int buffer_fd, fence_fd;
+ struct pipe_resource templ;
+ struct winsys_handle whandle;
+ unsigned usage;
+
+ buffer = CALLOC_STRUCT(vl_dri3_buffer);
+ if (!buffer)
+ return NULL;
+
+ fence_fd = xshmfence_alloc_shm();
+ if (fence_fd < 0)
+ goto free_buffer;
+
+ shm_fence = xshmfence_map_shm(fence_fd);
+ if (!shm_fence)
+ goto close_fd;
+
+ memset(&templ, 0, sizeof(templ));
+ templ.bind = PIPE_BIND_RENDER_TARGET | PIPE_BIND_SAMPLER_VIEW |
+ PIPE_BIND_SCANOUT | PIPE_BIND_SHARED;
+ templ.format = PIPE_FORMAT_B8G8R8X8_UNORM;
+ templ.target = PIPE_TEXTURE_2D;
+ templ.last_level = 0;
+ templ.width0 = scrn->width;
+ templ.height0 = scrn->height;
+ templ.depth0 = 1;
+ templ.array_size = 1;
+ buffer->texture = scrn->base.pscreen->resource_create(scrn->base.pscreen,
+ &templ);
+ if (!buffer->texture)
+ goto unmap_shm;
+
+ memset(&whandle, 0, sizeof(whandle));
+ whandle.type= DRM_API_HANDLE_TYPE_FD;
+ usage = PIPE_HANDLE_USAGE_EXPLICIT_FLUSH | PIPE_HANDLE_USAGE_READ;
+ scrn->base.pscreen->resource_get_handle(scrn->base.pscreen,
+ buffer->texture, &whandle,
+ usage);
+ buffer_fd = whandle.handle;
+ buffer->pitch = whandle.stride;
+ xcb_dri3_pixmap_from_buffer(scrn->conn,
+ (pixmap = xcb_generate_id(scrn->conn)),
+ scrn->drawable,
+ 0,
+ scrn->width, scrn->height, buffer->pitch,
+ scrn->depth, 32,
+ buffer_fd);
+ xcb_dri3_fence_from_fd(scrn->conn,
+ pixmap,
+ (sync_fence = xcb_generate_id(scrn->conn)),
+ false,
+ fence_fd);
+
+ buffer->pixmap = pixmap;
+ buffer->sync_fence = sync_fence;
+ buffer->shm_fence = shm_fence;
+ buffer->width = scrn->width;
+ buffer->height = scrn->height;
+
+ xshmfence_trigger(buffer->shm_fence);
+
+ return buffer;
+
+unmap_shm:
+ xshmfence_unmap_shm(shm_fence);
+close_fd:
+ close(fence_fd);
+free_buffer:
+ FREE(buffer);
+ return NULL;
+}
+
+static struct vl_dri3_buffer *
+dri3_get_back_buffer(struct vl_dri3_screen *scrn)
+{
+ struct vl_dri3_buffer *buffer;
+ struct pipe_resource *texture = NULL;
+
+ assert(scrn);
+
+ scrn->cur_back = dri3_find_back(scrn);
+ if (scrn->cur_back < 0)
+ return NULL;
+ buffer = scrn->back_buffers[scrn->cur_back];
+
+ if (!buffer) {
+ buffer = dri3_alloc_back_buffer(scrn);
+ if (!buffer)
+ return NULL;
+
+ scrn->back_buffers[scrn->cur_back] = buffer;
+ }
+
+ pipe_resource_reference(&texture, buffer->texture);
+ xcb_flush(scrn->conn);
+ xshmfence_await(buffer->shm_fence);
+
+ return buffer;
+}
+
+static bool
dri3_set_drawable(struct vl_dri3_screen *scrn, Drawable drawable)
{
xcb_get_geometry_cookie_t geom_cookie;
@@ -147,14 +318,18 @@ static struct pipe_resource *
vl_dri3_screen_texture_from_drawable(struct vl_screen *vscreen, void *drawable)
{
struct vl_dri3_screen *scrn = (struct vl_dri3_screen *)vscreen;
+ struct vl_dri3_buffer *buffer;
assert(scrn);
if (!dri3_set_drawable(scrn, (Drawable)drawable))
return NULL;
- /* TODO */
- return NULL;
+ buffer = dri3_get_back_buffer(scrn);
+ if (!buffer)
+ return NULL;
+
+ return buffer->texture;
}
static struct u_rect *
@@ -188,11 +363,19 @@ static void
vl_dri3_screen_destroy(struct vl_screen *vscreen)
{
struct vl_dri3_screen *scrn = (struct vl_dri3_screen *)vscreen;
+ int i;
assert(vscreen);
dri3_flush_present_events(scrn);
+ for (i = 0; i < BACK_BUFFER_NUM; ++i) {
+ if (scrn->back_buffers[i]) {
+ dri3_free_back_buffer(scrn, scrn->back_buffers[i]);
+ scrn->back_buffers[i] = NULL;
+ }
+ }
+
if (scrn->special_event)
xcb_unregister_for_special_event(scrn->conn, scrn->special_event);
scrn->base.pscreen->destroy(scrn->base.pscreen);
--
2.7.4
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