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mesa/src/loader/loader_dri3_helper.c
Thomas Hellstrom 81fb154777 loader/dri3: Use dri3_find_back in loader_dri3_swap_buffers_msc 
If the application hasn't done any drawing since the last call, we
would reuse the same back buffer which was used for the previous swap,
which may not have completed yet. This could result in various issues
such as tearing or application hangs.

In the normal case, the behaviour is unchanged.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=97957
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101683
Cc: mesa-stable@lists.freedesktop.org

[Michel Dänzer: Make Thomas' fix from bugzilla actually work as
 intended, write commit log]
2017-07-13 16:49:28 +09:00

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/*
* Copyright © 2013 Keith Packard
* Copyright © 2015 Boyan Ding
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that copyright
* notice and this permission notice appear in supporting documentation, and
* that the name of the copyright holders not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. The copyright holders make no representations
* about the suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
* OF THIS SOFTWARE.
*/
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <X11/xshmfence.h>
#include <xcb/xcb.h>
#include <xcb/dri3.h>
#include <xcb/present.h>
#include <X11/Xlib-xcb.h>
#include "loader_dri3_helper.h"
/* From xmlpool/options.h, user exposed so should be stable */
#define DRI_CONF_VBLANK_NEVER 0
#define DRI_CONF_VBLANK_DEF_INTERVAL_0 1
#define DRI_CONF_VBLANK_DEF_INTERVAL_1 2
#define DRI_CONF_VBLANK_ALWAYS_SYNC 3
static inline void
dri3_fence_reset(xcb_connection_t *c, struct loader_dri3_buffer *buffer)
{
xshmfence_reset(buffer->shm_fence);
}
static inline void
dri3_fence_set(struct loader_dri3_buffer *buffer)
{
xshmfence_trigger(buffer->shm_fence);
}
static inline void
dri3_fence_trigger(xcb_connection_t *c, struct loader_dri3_buffer *buffer)
{
xcb_sync_trigger_fence(c, buffer->sync_fence);
}
static inline void
dri3_fence_await(xcb_connection_t *c, struct loader_dri3_buffer *buffer)
{
xcb_flush(c);
xshmfence_await(buffer->shm_fence);
}
static void
dri3_update_num_back(struct loader_dri3_drawable *draw)
{
if (draw->flipping)
draw->num_back = 3;
else
draw->num_back = 2;
}
void
loader_dri3_set_swap_interval(struct loader_dri3_drawable *draw, int interval)
{
interval = draw->vtable->clamp_swap_interval(draw, interval);
draw->vtable->set_swap_interval(draw, interval);
dri3_update_num_back(draw);
}
/** dri3_free_render_buffer
*
* Free everything associated with one render buffer including pixmap, fence
* stuff and the driver image
*/
static void
dri3_free_render_buffer(struct loader_dri3_drawable *draw,
struct loader_dri3_buffer *buffer)
{
if (buffer->own_pixmap)
xcb_free_pixmap(draw->conn, buffer->pixmap);
xcb_sync_destroy_fence(draw->conn, buffer->sync_fence);
xshmfence_unmap_shm(buffer->shm_fence);
draw->ext->image->destroyImage(buffer->image);
if (buffer->linear_buffer)
draw->ext->image->destroyImage(buffer->linear_buffer);
free(buffer);
}
void
loader_dri3_drawable_fini(struct loader_dri3_drawable *draw)
{
int i;
draw->ext->core->destroyDrawable(draw->dri_drawable);
for (i = 0; i < LOADER_DRI3_NUM_BUFFERS; i++) {
if (draw->buffers[i])
dri3_free_render_buffer(draw, draw->buffers[i]);
}
if (draw->special_event) {
xcb_void_cookie_t cookie =
xcb_present_select_input_checked(draw->conn, draw->eid, draw->drawable,
XCB_PRESENT_EVENT_MASK_NO_EVENT);
xcb_discard_reply(draw->conn, cookie.sequence);
xcb_unregister_for_special_event(draw->conn, draw->special_event);
}
}
int
loader_dri3_drawable_init(xcb_connection_t *conn,
xcb_drawable_t drawable,
__DRIscreen *dri_screen,
bool is_different_gpu,
const __DRIconfig *dri_config,
struct loader_dri3_extensions *ext,
const struct loader_dri3_vtable *vtable,
struct loader_dri3_drawable *draw)
{
xcb_get_geometry_cookie_t cookie;
xcb_get_geometry_reply_t *reply;
xcb_generic_error_t *error;
GLint vblank_mode = DRI_CONF_VBLANK_DEF_INTERVAL_1;
int swap_interval;
draw->conn = conn;
draw->ext = ext;
draw->vtable = vtable;
draw->drawable = drawable;
draw->dri_screen = dri_screen;
draw->is_different_gpu = is_different_gpu;
draw->have_back = 0;
draw->have_fake_front = 0;
draw->first_init = true;
if (draw->ext->config)
draw->ext->config->configQueryi(draw->dri_screen,
"vblank_mode", &vblank_mode);
switch (vblank_mode) {
case DRI_CONF_VBLANK_NEVER:
case DRI_CONF_VBLANK_DEF_INTERVAL_0:
swap_interval = 0;
break;
case DRI_CONF_VBLANK_DEF_INTERVAL_1:
case DRI_CONF_VBLANK_ALWAYS_SYNC:
default:
swap_interval = 1;
break;
}
draw->vtable->set_swap_interval(draw, swap_interval);
dri3_update_num_back(draw);
/* Create a new drawable */
draw->dri_drawable =
draw->ext->image_driver->createNewDrawable(dri_screen,
dri_config,
draw);
if (!draw->dri_drawable)
return 1;
cookie = xcb_get_geometry(draw->conn, draw->drawable);
reply = xcb_get_geometry_reply(draw->conn, cookie, &error);
if (reply == NULL || error != NULL) {
draw->ext->core->destroyDrawable(draw->dri_drawable);
return 1;
}
draw->width = reply->width;
draw->height = reply->height;
draw->depth = reply->depth;
draw->vtable->set_drawable_size(draw, draw->width, draw->height);
free(reply);
/*
* Make sure server has the same swap interval we do for the new
* drawable.
*/
loader_dri3_set_swap_interval(draw, swap_interval);
return 0;
}
/*
* Process one Present event
*/
static void
dri3_handle_present_event(struct loader_dri3_drawable *draw,
xcb_present_generic_event_t *ge)
{
switch (ge->evtype) {
case XCB_PRESENT_CONFIGURE_NOTIFY: {
xcb_present_configure_notify_event_t *ce = (void *) ge;
draw->width = ce->width;
draw->height = ce->height;
draw->vtable->set_drawable_size(draw, draw->width, draw->height);
break;
}
case XCB_PRESENT_COMPLETE_NOTIFY: {
xcb_present_complete_notify_event_t *ce = (void *) ge;
/* Compute the processed SBC number from the received 32-bit serial number
* merged with the upper 32-bits of the sent 64-bit serial number while
* checking for wrap.
*/
if (ce->kind == XCB_PRESENT_COMPLETE_KIND_PIXMAP) {
draw->recv_sbc = (draw->send_sbc & 0xffffffff00000000LL) | ce->serial;
if (draw->recv_sbc > draw->send_sbc)
draw->recv_sbc -= 0x100000000;
switch (ce->mode) {
case XCB_PRESENT_COMPLETE_MODE_FLIP:
draw->flipping = true;
break;
case XCB_PRESENT_COMPLETE_MODE_COPY:
draw->flipping = false;
break;
}
dri3_update_num_back(draw);
if (draw->vtable->show_fps)
draw->vtable->show_fps(draw, ce->ust);
draw->ust = ce->ust;
draw->msc = ce->msc;
} else {
draw->recv_msc_serial = ce->serial;
draw->notify_ust = ce->ust;
draw->notify_msc = ce->msc;
}
break;
}
case XCB_PRESENT_EVENT_IDLE_NOTIFY: {
xcb_present_idle_notify_event_t *ie = (void *) ge;
int b;
for (b = 0; b < sizeof(draw->buffers) / sizeof(draw->buffers[0]); b++) {
struct loader_dri3_buffer *buf = draw->buffers[b];
if (buf && buf->pixmap == ie->pixmap) {
buf->busy = 0;
if (draw->num_back <= b && b < LOADER_DRI3_MAX_BACK) {
dri3_free_render_buffer(draw, buf);
draw->buffers[b] = NULL;
}
break;
}
}
break;
}
}
free(ge);
}
static bool
dri3_wait_for_event(struct loader_dri3_drawable *draw)
{
xcb_generic_event_t *ev;
xcb_present_generic_event_t *ge;
xcb_flush(draw->conn);
ev = xcb_wait_for_special_event(draw->conn, draw->special_event);
if (!ev)
return false;
ge = (void *) ev;
dri3_handle_present_event(draw, ge);
return true;
}
/** loader_dri3_wait_for_msc
*
* Get the X server to send an event when the target msc/divisor/remainder is
* reached.
*/
bool
loader_dri3_wait_for_msc(struct loader_dri3_drawable *draw,
int64_t target_msc,
int64_t divisor, int64_t remainder,
int64_t *ust, int64_t *msc, int64_t *sbc)
{
uint32_t msc_serial;
msc_serial = ++draw->send_msc_serial;
xcb_present_notify_msc(draw->conn,
draw->drawable,
msc_serial,
target_msc,
divisor,
remainder);
xcb_flush(draw->conn);
/* Wait for the event */
if (draw->special_event) {
while ((int32_t) (msc_serial - draw->recv_msc_serial) > 0) {
if (!dri3_wait_for_event(draw))
return false;
}
}
*ust = draw->notify_ust;
*msc = draw->notify_msc;
*sbc = draw->recv_sbc;
return true;
}
/** loader_dri3_wait_for_sbc
*
* Wait for the completed swap buffer count to reach the specified
* target. Presumably the application knows that this will be reached with
* outstanding complete events, or we're going to be here awhile.
*/
int
loader_dri3_wait_for_sbc(struct loader_dri3_drawable *draw,
int64_t target_sbc, int64_t *ust,
int64_t *msc, int64_t *sbc)
{
/* From the GLX_OML_sync_control spec:
*
* "If <target_sbc> = 0, the function will block until all previous
* swaps requested with glXSwapBuffersMscOML for that window have
* completed."
*/
if (!target_sbc)
target_sbc = draw->send_sbc;
while (draw->recv_sbc < target_sbc) {
if (!dri3_wait_for_event(draw))
return 0;
}
*ust = draw->ust;
*msc = draw->msc;
*sbc = draw->recv_sbc;
return 1;
}
/** loader_dri3_find_back
*
* Find an idle back buffer. If there isn't one, then
* wait for a present idle notify event from the X server
*/
static int
dri3_find_back(struct loader_dri3_drawable *draw)
{
int b;
xcb_generic_event_t *ev;
xcb_present_generic_event_t *ge;
for (;;) {
for (b = 0; b < draw->num_back; b++) {
int id = LOADER_DRI3_BACK_ID((b + draw->cur_back) % draw->num_back);
struct loader_dri3_buffer *buffer = draw->buffers[id];
if (!buffer || !buffer->busy) {
draw->cur_back = id;
return id;
}
}
xcb_flush(draw->conn);
ev = xcb_wait_for_special_event(draw->conn, draw->special_event);
if (!ev)
return -1;
ge = (void *) ev;
dri3_handle_present_event(draw, ge);
}
}
static xcb_gcontext_t
dri3_drawable_gc(struct loader_dri3_drawable *draw)
{
if (!draw->gc) {
uint32_t v = 0;
xcb_create_gc(draw->conn,
(draw->gc = xcb_generate_id(draw->conn)),
draw->drawable,
XCB_GC_GRAPHICS_EXPOSURES,
&v);
}
return draw->gc;
}
static struct loader_dri3_buffer *
dri3_back_buffer(struct loader_dri3_drawable *draw)
{
return draw->buffers[LOADER_DRI3_BACK_ID(draw->cur_back)];
}
static struct loader_dri3_buffer *
dri3_fake_front_buffer(struct loader_dri3_drawable *draw)
{
return draw->buffers[LOADER_DRI3_FRONT_ID];
}
static void
dri3_copy_area(xcb_connection_t *c,
xcb_drawable_t src_drawable,
xcb_drawable_t dst_drawable,
xcb_gcontext_t gc,
int16_t src_x,
int16_t src_y,
int16_t dst_x,
int16_t dst_y,
uint16_t width,
uint16_t height)
{
xcb_void_cookie_t cookie;
cookie = xcb_copy_area_checked(c,
src_drawable,
dst_drawable,
gc,
src_x,
src_y,
dst_x,
dst_y,
width,
height);
xcb_discard_reply(c, cookie.sequence);
}
/**
* Asks the driver to flush any queued work necessary for serializing with the
* X command stream, and optionally the slightly more strict requirement of
* glFlush() equivalence (which would require flushing even if nothing had
* been drawn to a window system framebuffer, for example).
*/
void
loader_dri3_flush(struct loader_dri3_drawable *draw,
unsigned flags,
enum __DRI2throttleReason throttle_reason)
{
/* NEED TO CHECK WHETHER CONTEXT IS NULL */
__DRIcontext *dri_context = draw->vtable->get_dri_context(draw);
if (dri_context) {
draw->ext->flush->flush_with_flags(dri_context, draw->dri_drawable,
flags, throttle_reason);
}
}
void
loader_dri3_copy_sub_buffer(struct loader_dri3_drawable *draw,
int x, int y,
int width, int height,
bool flush)
{
struct loader_dri3_buffer *back;
unsigned flags = __DRI2_FLUSH_DRAWABLE;
__DRIcontext *dri_context;
dri_context = draw->vtable->get_dri_context(draw);
/* Check we have the right attachments */
if (!draw->have_back || draw->is_pixmap)
return;
if (flush)
flags |= __DRI2_FLUSH_CONTEXT;
loader_dri3_flush(draw, flags, __DRI2_THROTTLE_SWAPBUFFER);
back = dri3_back_buffer(draw);
y = draw->height - y - height;
if (draw->is_different_gpu && draw->vtable->in_current_context(draw)) {
/* Update the linear buffer part of the back buffer
* for the dri3_copy_area operation
*/
draw->ext->image->blitImage(dri_context,
back->linear_buffer,
back->image,
0, 0, back->width,
back->height,
0, 0, back->width,
back->height, __BLIT_FLAG_FLUSH);
/* We use blitImage to update our fake front,
*/
if (draw->have_fake_front)
draw->ext->image->blitImage(dri_context,
dri3_fake_front_buffer(draw)->image,
back->image,
x, y, width, height,
x, y, width, height, __BLIT_FLAG_FLUSH);
}
dri3_fence_reset(draw->conn, back);
dri3_copy_area(draw->conn,
dri3_back_buffer(draw)->pixmap,
draw->drawable,
dri3_drawable_gc(draw),
x, y, x, y, width, height);
dri3_fence_trigger(draw->conn, back);
/* Refresh the fake front (if present) after we just damaged the real
* front.
*/
if (draw->have_fake_front && !draw->is_different_gpu) {
dri3_fence_reset(draw->conn, dri3_fake_front_buffer(draw));
dri3_copy_area(draw->conn,
dri3_back_buffer(draw)->pixmap,
dri3_fake_front_buffer(draw)->pixmap,
dri3_drawable_gc(draw),
x, y, x, y, width, height);
dri3_fence_trigger(draw->conn, dri3_fake_front_buffer(draw));
dri3_fence_await(draw->conn, dri3_fake_front_buffer(draw));
}
dri3_fence_await(draw->conn, back);
}
void
loader_dri3_copy_drawable(struct loader_dri3_drawable *draw,
xcb_drawable_t dest,
xcb_drawable_t src)
{
loader_dri3_flush(draw, __DRI2_FLUSH_DRAWABLE, 0);
dri3_fence_reset(draw->conn, dri3_fake_front_buffer(draw));
dri3_copy_area(draw->conn,
src, dest,
dri3_drawable_gc(draw),
0, 0, 0, 0, draw->width, draw->height);
dri3_fence_trigger(draw->conn, dri3_fake_front_buffer(draw));
dri3_fence_await(draw->conn, dri3_fake_front_buffer(draw));
}
void
loader_dri3_wait_x(struct loader_dri3_drawable *draw)
{
struct loader_dri3_buffer *front;
__DRIcontext *dri_context;
if (draw == NULL || !draw->have_fake_front)
return;
front = dri3_fake_front_buffer(draw);
dri_context = draw->vtable->get_dri_context(draw);
loader_dri3_copy_drawable(draw, front->pixmap, draw->drawable);
/* In the psc->is_different_gpu case, the linear buffer has been updated,
* but not yet the tiled buffer.
* Copy back to the tiled buffer we use for rendering.
* Note that we don't need flushing.
*/
if (draw->is_different_gpu && draw->vtable->in_current_context(draw))
draw->ext->image->blitImage(dri_context,
front->image,
front->linear_buffer,
0, 0, front->width,
front->height,
0, 0, front->width,
front->height, 0);
}
void
loader_dri3_wait_gl(struct loader_dri3_drawable *draw)
{
struct loader_dri3_buffer *front;
__DRIcontext *dri_context;
if (draw == NULL || !draw->have_fake_front)
return;
front = dri3_fake_front_buffer(draw);
dri_context = draw->vtable->get_dri_context(draw);
/* In the psc->is_different_gpu case, we update the linear_buffer
* before updating the real front.
*/
if (draw->is_different_gpu && draw->vtable->in_current_context(draw))
draw->ext->image->blitImage(dri_context,
front->linear_buffer,
front->image,
0, 0, front->width,
front->height,
0, 0, front->width,
front->height, __BLIT_FLAG_FLUSH);
loader_dri3_copy_drawable(draw, draw->drawable, front->pixmap);
}
/** dri3_flush_present_events
*
* Process any present events that have been received from the X server
*/
static void
dri3_flush_present_events(struct loader_dri3_drawable *draw)
{
/* Check to see if any configuration changes have occurred
* since we were last invoked
*/
if (draw->special_event) {
xcb_generic_event_t *ev;
while ((ev = xcb_poll_for_special_event(draw->conn,
draw->special_event)) != NULL) {
xcb_present_generic_event_t *ge = (void *) ev;
dri3_handle_present_event(draw, ge);
}
}
}
/** loader_dri3_swap_buffers_msc
*
* Make the current back buffer visible using the present extension
*/
int64_t
loader_dri3_swap_buffers_msc(struct loader_dri3_drawable *draw,
int64_t target_msc, int64_t divisor,
int64_t remainder, unsigned flush_flags,
bool force_copy)
{
struct loader_dri3_buffer *back;
__DRIcontext *dri_context;
int64_t ret = 0;
uint32_t options = XCB_PRESENT_OPTION_NONE;
int swap_interval;
dri_context = draw->vtable->get_dri_context(draw);
swap_interval = draw->vtable->get_swap_interval(draw);
draw->vtable->flush_drawable(draw, flush_flags);
back = draw->buffers[dri3_find_back(draw)];
if (draw->is_different_gpu && back) {
/* Update the linear buffer before presenting the pixmap */
draw->ext->image->blitImage(dri_context,
back->linear_buffer,
back->image,
0, 0, back->width,
back->height,
0, 0, back->width,
back->height, __BLIT_FLAG_FLUSH);
/* Update the fake front */
if (draw->have_fake_front)
draw->ext->image->blitImage(dri_context,
draw->buffers[LOADER_DRI3_FRONT_ID]->image,
back->image,
0, 0, draw->width, draw->height,
0, 0, draw->width, draw->height,
__BLIT_FLAG_FLUSH);
}
dri3_flush_present_events(draw);
if (back && !draw->is_pixmap) {
dri3_fence_reset(draw->conn, back);
/* Compute when we want the frame shown by taking the last known
* successful MSC and adding in a swap interval for each outstanding swap
* request. target_msc=divisor=remainder=0 means "Use glXSwapBuffers()
* semantic"
*/
++draw->send_sbc;
if (target_msc == 0 && divisor == 0 && remainder == 0)
target_msc = draw->msc + swap_interval *
(draw->send_sbc - draw->recv_sbc);
else if (divisor == 0 && remainder > 0) {
/* From the GLX_OML_sync_control spec:
* "If <divisor> = 0, the swap will occur when MSC becomes
* greater than or equal to <target_msc>."
*
* Note that there's no mention of the remainder. The Present
* extension throws BadValue for remainder != 0 with divisor == 0, so
* just drop the passed in value.
*/
remainder = 0;
}
/* From the GLX_EXT_swap_control spec
* and the EGL 1.4 spec (page 53):
*
* "If <interval> is set to a value of 0, buffer swaps are not
* synchronized to a video frame."
*
* Implementation note: It is possible to enable triple buffering
* behaviour by not using XCB_PRESENT_OPTION_ASYNC, but this should not be
* the default.
*/
if (swap_interval == 0)
options |= XCB_PRESENT_OPTION_ASYNC;
if (force_copy)
options |= XCB_PRESENT_OPTION_COPY;
back->busy = 1;
back->last_swap = draw->send_sbc;
xcb_present_pixmap(draw->conn,
draw->drawable,
back->pixmap,
(uint32_t) draw->send_sbc,
0, /* valid */
0, /* update */
0, /* x_off */
0, /* y_off */
None, /* target_crtc */
None,
back->sync_fence,
options,
target_msc,
divisor,
remainder, 0, NULL);
ret = (int64_t) draw->send_sbc;
/* If there's a fake front, then copy the source back buffer
* to the fake front to keep it up to date. This needs
* to reset the fence and make future users block until
* the X server is done copying the bits
*/
if (draw->have_fake_front && !draw->is_different_gpu) {
dri3_fence_reset(draw->conn, draw->buffers[LOADER_DRI3_FRONT_ID]);
dri3_copy_area(draw->conn,
back->pixmap,
draw->buffers[LOADER_DRI3_FRONT_ID]->pixmap,
dri3_drawable_gc(draw),
0, 0, 0, 0,
draw->width, draw->height);
dri3_fence_trigger(draw->conn, draw->buffers[LOADER_DRI3_FRONT_ID]);
}
xcb_flush(draw->conn);
if (draw->stamp)
++(*draw->stamp);
}
draw->ext->flush->invalidate(draw->dri_drawable);
return ret;
}
int
loader_dri3_query_buffer_age(struct loader_dri3_drawable *draw)
{
int back_id = LOADER_DRI3_BACK_ID(dri3_find_back(draw));
if (back_id < 0 || !draw->buffers[back_id])
return 0;
if (draw->buffers[back_id]->last_swap != 0)
return draw->send_sbc - draw->buffers[back_id]->last_swap + 1;
else
return 0;
}
/** loader_dri3_open
*
* Wrapper around xcb_dri3_open
*/
int
loader_dri3_open(xcb_connection_t *conn,
xcb_window_t root,
uint32_t provider)
{
xcb_dri3_open_cookie_t cookie;
xcb_dri3_open_reply_t *reply;
int fd;
cookie = xcb_dri3_open(conn,
root,
provider);
reply = xcb_dri3_open_reply(conn, cookie, NULL);
if (!reply)
return -1;
if (reply->nfd != 1) {
free(reply);
return -1;
}
fd = xcb_dri3_open_reply_fds(conn, reply)[0];
free(reply);
fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC);
return fd;
}
static uint32_t
dri3_cpp_for_format(uint32_t format) {
switch (format) {
case __DRI_IMAGE_FORMAT_R8:
return 1;
case __DRI_IMAGE_FORMAT_RGB565:
case __DRI_IMAGE_FORMAT_GR88:
return 2;
case __DRI_IMAGE_FORMAT_XRGB8888:
case __DRI_IMAGE_FORMAT_ARGB8888:
case __DRI_IMAGE_FORMAT_ABGR8888:
case __DRI_IMAGE_FORMAT_XBGR8888:
case __DRI_IMAGE_FORMAT_XRGB2101010:
case __DRI_IMAGE_FORMAT_ARGB2101010:
case __DRI_IMAGE_FORMAT_SARGB8:
return 4;
case __DRI_IMAGE_FORMAT_NONE:
default:
return 0;
}
}
/** loader_dri3_alloc_render_buffer
*
* Use the driver createImage function to construct a __DRIimage, then
* get a file descriptor for that and create an X pixmap from that
*
* Allocate an xshmfence for synchronization
*/
static struct loader_dri3_buffer *
dri3_alloc_render_buffer(struct loader_dri3_drawable *draw, unsigned int format,
int width, int height, int depth)
{
struct loader_dri3_buffer *buffer;
__DRIimage *pixmap_buffer;
xcb_pixmap_t pixmap;
xcb_sync_fence_t sync_fence;
struct xshmfence *shm_fence;
int buffer_fd, fence_fd;
int stride;
/* Create an xshmfence object and
* prepare to send that to the X server
*/
fence_fd = xshmfence_alloc_shm();
if (fence_fd < 0)
return NULL;
shm_fence = xshmfence_map_shm(fence_fd);
if (shm_fence == NULL)
goto no_shm_fence;
/* Allocate the image from the driver
*/
buffer = calloc(1, sizeof *buffer);
if (!buffer)
goto no_buffer;
buffer->cpp = dri3_cpp_for_format(format);
if (!buffer->cpp)
goto no_image;
if (!draw->is_different_gpu) {
buffer->image = draw->ext->image->createImage(draw->dri_screen,
width, height,
format,
__DRI_IMAGE_USE_SHARE |
__DRI_IMAGE_USE_SCANOUT |
__DRI_IMAGE_USE_BACKBUFFER,
buffer);
pixmap_buffer = buffer->image;
if (!buffer->image)
goto no_image;
} else {
buffer->image = draw->ext->image->createImage(draw->dri_screen,
width, height,
format,
0,
buffer);
if (!buffer->image)
goto no_image;
buffer->linear_buffer =
draw->ext->image->createImage(draw->dri_screen,
width, height, format,
__DRI_IMAGE_USE_SHARE |
__DRI_IMAGE_USE_LINEAR |
__DRI_IMAGE_USE_BACKBUFFER,
buffer);
pixmap_buffer = buffer->linear_buffer;
if (!buffer->linear_buffer)
goto no_linear_buffer;
}
/* X wants the stride, so ask the image for it
*/
if (!draw->ext->image->queryImage(pixmap_buffer, __DRI_IMAGE_ATTRIB_STRIDE,
&stride))
goto no_buffer_attrib;
buffer->pitch = stride;
if (!draw->ext->image->queryImage(pixmap_buffer, __DRI_IMAGE_ATTRIB_FD,
&buffer_fd))
goto no_buffer_attrib;
xcb_dri3_pixmap_from_buffer(draw->conn,
(pixmap = xcb_generate_id(draw->conn)),
draw->drawable,
buffer->size,
width, height, buffer->pitch,
depth, buffer->cpp * 8,
buffer_fd);
xcb_dri3_fence_from_fd(draw->conn,
pixmap,
(sync_fence = xcb_generate_id(draw->conn)),
false,
fence_fd);
buffer->pixmap = pixmap;
buffer->own_pixmap = true;
buffer->sync_fence = sync_fence;
buffer->shm_fence = shm_fence;
buffer->width = width;
buffer->height = height;
/* Mark the buffer as idle
*/
dri3_fence_set(buffer);
return buffer;
no_buffer_attrib:
draw->ext->image->destroyImage(pixmap_buffer);
no_linear_buffer:
if (draw->is_different_gpu)
draw->ext->image->destroyImage(buffer->image);
no_image:
free(buffer);
no_buffer:
xshmfence_unmap_shm(shm_fence);
no_shm_fence:
close(fence_fd);
return NULL;
}
/** loader_dri3_update_drawable
*
* Called the first time we use the drawable and then
* after we receive present configure notify events to
* track the geometry of the drawable
*/
static int
dri3_update_drawable(__DRIdrawable *driDrawable,
struct loader_dri3_drawable *draw)
{
if (draw->first_init) {
xcb_get_geometry_cookie_t geom_cookie;
xcb_get_geometry_reply_t *geom_reply;
xcb_void_cookie_t cookie;
xcb_generic_error_t *error;
xcb_present_query_capabilities_cookie_t present_capabilities_cookie;
xcb_present_query_capabilities_reply_t *present_capabilities_reply;
draw->first_init = false;
/* Try to select for input on the window.
*
* If the drawable is a window, this will get our events
* delivered.
*
* Otherwise, we'll get a BadWindow error back from this request which
* will let us know that the drawable is a pixmap instead.
*/
draw->eid = xcb_generate_id(draw->conn);
cookie =
xcb_present_select_input_checked(draw->conn, draw->eid, draw->drawable,
XCB_PRESENT_EVENT_MASK_CONFIGURE_NOTIFY |
XCB_PRESENT_EVENT_MASK_COMPLETE_NOTIFY |
XCB_PRESENT_EVENT_MASK_IDLE_NOTIFY);
present_capabilities_cookie =
xcb_present_query_capabilities(draw->conn, draw->drawable);
/* Create an XCB event queue to hold present events outside of the usual
* application event queue
*/
draw->special_event = xcb_register_for_special_xge(draw->conn,
&xcb_present_id,
draw->eid,
draw->stamp);
geom_cookie = xcb_get_geometry(draw->conn, draw->drawable);
geom_reply = xcb_get_geometry_reply(draw->conn, geom_cookie, NULL);
if (!geom_reply)
return false;
draw->width = geom_reply->width;
draw->height = geom_reply->height;
draw->depth = geom_reply->depth;
draw->vtable->set_drawable_size(draw, draw->width, draw->height);
free(geom_reply);
draw->is_pixmap = false;
/* Check to see if our select input call failed. If it failed with a
* BadWindow error, then assume the drawable is a pixmap. Destroy the
* special event queue created above and mark the drawable as a pixmap
*/
error = xcb_request_check(draw->conn, cookie);
present_capabilities_reply =
xcb_present_query_capabilities_reply(draw->conn,
present_capabilities_cookie,
NULL);
if (present_capabilities_reply) {
draw->present_capabilities = present_capabilities_reply->capabilities;
free(present_capabilities_reply);
} else
draw->present_capabilities = 0;
if (error) {
if (error->error_code != BadWindow) {
free(error);
return false;
}
draw->is_pixmap = true;
xcb_unregister_for_special_event(draw->conn, draw->special_event);
draw->special_event = NULL;
}
}
dri3_flush_present_events(draw);
return true;
}
/* the DRIimage createImage function takes __DRI_IMAGE_FORMAT codes, while
* the createImageFromFds call takes __DRI_IMAGE_FOURCC codes. To avoid
* complete confusion, just deal in __DRI_IMAGE_FORMAT codes for now and
* translate to __DRI_IMAGE_FOURCC codes in the call to createImageFromFds
*/
static int
image_format_to_fourcc(int format)
{
/* Convert from __DRI_IMAGE_FORMAT to __DRI_IMAGE_FOURCC (sigh) */
switch (format) {
case __DRI_IMAGE_FORMAT_SARGB8: return __DRI_IMAGE_FOURCC_SARGB8888;
case __DRI_IMAGE_FORMAT_RGB565: return __DRI_IMAGE_FOURCC_RGB565;
case __DRI_IMAGE_FORMAT_XRGB8888: return __DRI_IMAGE_FOURCC_XRGB8888;
case __DRI_IMAGE_FORMAT_ARGB8888: return __DRI_IMAGE_FOURCC_ARGB8888;
case __DRI_IMAGE_FORMAT_ABGR8888: return __DRI_IMAGE_FOURCC_ABGR8888;
case __DRI_IMAGE_FORMAT_XBGR8888: return __DRI_IMAGE_FOURCC_XBGR8888;
}
return 0;
}
__DRIimage *
loader_dri3_create_image(xcb_connection_t *c,
xcb_dri3_buffer_from_pixmap_reply_t *bp_reply,
unsigned int format,
__DRIscreen *dri_screen,
const __DRIimageExtension *image,
void *loaderPrivate)
{
int *fds;
__DRIimage *image_planar, *ret;
int stride, offset;
/* Get an FD for the pixmap object
*/
fds = xcb_dri3_buffer_from_pixmap_reply_fds(c, bp_reply);
stride = bp_reply->stride;
offset = 0;
/* createImageFromFds creates a wrapper __DRIimage structure which
* can deal with multiple planes for things like Yuv images. So, once
* we've gotten the planar wrapper, pull the single plane out of it and
* discard the wrapper.
*/
image_planar = image->createImageFromFds(dri_screen,
bp_reply->width,
bp_reply->height,
image_format_to_fourcc(format),
fds, 1,
&stride, &offset, loaderPrivate);
close(fds[0]);
if (!image_planar)
return NULL;
ret = image->fromPlanar(image_planar, 0, loaderPrivate);
image->destroyImage(image_planar);
return ret;
}
/** dri3_get_pixmap_buffer
*
* Get the DRM object for a pixmap from the X server and
* wrap that with a __DRIimage structure using createImageFromFds
*/
static struct loader_dri3_buffer *
dri3_get_pixmap_buffer(__DRIdrawable *driDrawable, unsigned int format,
enum loader_dri3_buffer_type buffer_type,
struct loader_dri3_drawable *draw)
{
int buf_id = loader_dri3_pixmap_buf_id(buffer_type);
struct loader_dri3_buffer *buffer = draw->buffers[buf_id];
xcb_drawable_t pixmap;
xcb_dri3_buffer_from_pixmap_cookie_t bp_cookie;
xcb_dri3_buffer_from_pixmap_reply_t *bp_reply;
xcb_sync_fence_t sync_fence;
struct xshmfence *shm_fence;
int fence_fd;
__DRIscreen *cur_screen;
if (buffer)
return buffer;
pixmap = draw->drawable;
buffer = calloc(1, sizeof *buffer);
if (!buffer)
goto no_buffer;
fence_fd = xshmfence_alloc_shm();
if (fence_fd < 0)
goto no_fence;
shm_fence = xshmfence_map_shm(fence_fd);
if (shm_fence == NULL) {
close (fence_fd);
goto no_fence;
}
xcb_dri3_fence_from_fd(draw->conn,
pixmap,
(sync_fence = xcb_generate_id(draw->conn)),
false,
fence_fd);
bp_cookie = xcb_dri3_buffer_from_pixmap(draw->conn, pixmap);
bp_reply = xcb_dri3_buffer_from_pixmap_reply(draw->conn, bp_cookie, NULL);
if (!bp_reply)
goto no_image;
/* Get the currently-bound screen or revert to using the drawable's screen if
* no contexts are currently bound. The latter case is at least necessary for
* obs-studio, when using Window Capture (Xcomposite) as a Source.
*/
cur_screen = draw->vtable->get_dri_screen(draw);
if (!cur_screen) {
cur_screen = draw->dri_screen;
}
buffer->image = loader_dri3_create_image(draw->conn, bp_reply, format,
cur_screen, draw->ext->image,
buffer);
if (!buffer->image)
goto no_image;
buffer->pixmap = pixmap;
buffer->own_pixmap = false;
buffer->width = bp_reply->width;
buffer->height = bp_reply->height;
buffer->buffer_type = buffer_type;
buffer->shm_fence = shm_fence;
buffer->sync_fence = sync_fence;
draw->buffers[buf_id] = buffer;
free(bp_reply);
return buffer;
no_image:
free(bp_reply);
xcb_sync_destroy_fence(draw->conn, sync_fence);
xshmfence_unmap_shm(shm_fence);
no_fence:
free(buffer);
no_buffer:
return NULL;
}
/** dri3_get_buffer
*
* Find a front or back buffer, allocating new ones as necessary
*/
static struct loader_dri3_buffer *
dri3_get_buffer(__DRIdrawable *driDrawable,
unsigned int format,
enum loader_dri3_buffer_type buffer_type,
struct loader_dri3_drawable *draw)
{
struct loader_dri3_buffer *buffer;
int buf_id;
__DRIcontext *dri_context;
dri_context = draw->vtable->get_dri_context(draw);
if (buffer_type == loader_dri3_buffer_back) {
buf_id = dri3_find_back(draw);
if (buf_id < 0)
return NULL;
} else {
buf_id = LOADER_DRI3_FRONT_ID;
}
buffer = draw->buffers[buf_id];
/* Allocate a new buffer if there isn't an old one, or if that
* old one is the wrong size
*/
if (!buffer || buffer->width != draw->width ||
buffer->height != draw->height) {
struct loader_dri3_buffer *new_buffer;
/* Allocate the new buffers
*/
new_buffer = dri3_alloc_render_buffer(draw,
format,
draw->width,
draw->height,
draw->depth);
if (!new_buffer)
return NULL;
/* When resizing, copy the contents of the old buffer, waiting for that
* copy to complete using our fences before proceeding
*/
switch (buffer_type) {
case loader_dri3_buffer_back:
if (buffer) {
if (!buffer->linear_buffer) {
dri3_fence_reset(draw->conn, new_buffer);
dri3_fence_await(draw->conn, buffer);
dri3_copy_area(draw->conn,
buffer->pixmap,
new_buffer->pixmap,
dri3_drawable_gc(draw),
0, 0, 0, 0,
draw->width, draw->height);
dri3_fence_trigger(draw->conn, new_buffer);
} else if (draw->vtable->in_current_context(draw)) {
draw->ext->image->blitImage(dri_context,
new_buffer->image,
buffer->image,
0, 0, draw->width, draw->height,
0, 0, draw->width, draw->height, 0);
}
dri3_free_render_buffer(draw, buffer);
}
break;
case loader_dri3_buffer_front:
dri3_fence_reset(draw->conn, new_buffer);
dri3_copy_area(draw->conn,
draw->drawable,
new_buffer->pixmap,
dri3_drawable_gc(draw),
0, 0, 0, 0,
draw->width, draw->height);
dri3_fence_trigger(draw->conn, new_buffer);
if (new_buffer->linear_buffer &&
draw->vtable->in_current_context(draw)) {
dri3_fence_await(draw->conn, new_buffer);
draw->ext->image->blitImage(dri_context,
new_buffer->image,
new_buffer->linear_buffer,
0, 0, draw->width, draw->height,
0, 0, draw->width, draw->height, 0);
}
break;
}
buffer = new_buffer;
buffer->buffer_type = buffer_type;
draw->buffers[buf_id] = buffer;
}
dri3_fence_await(draw->conn, buffer);
/* Return the requested buffer */
return buffer;
}
/** dri3_free_buffers
*
* Free the front bufffer or all of the back buffers. Used
* when the application changes which buffers it needs
*/
static void
dri3_free_buffers(__DRIdrawable *driDrawable,
enum loader_dri3_buffer_type buffer_type,
struct loader_dri3_drawable *draw)
{
struct loader_dri3_buffer *buffer;
int first_id;
int n_id;
int buf_id;
switch (buffer_type) {
case loader_dri3_buffer_back:
first_id = LOADER_DRI3_BACK_ID(0);
n_id = LOADER_DRI3_MAX_BACK;
break;
case loader_dri3_buffer_front:
first_id = LOADER_DRI3_FRONT_ID;
n_id = 1;
}
for (buf_id = first_id; buf_id < first_id + n_id; buf_id++) {
buffer = draw->buffers[buf_id];
if (buffer) {
dri3_free_render_buffer(draw, buffer);
draw->buffers[buf_id] = NULL;
}
}
}
/** loader_dri3_get_buffers
*
* The published buffer allocation API.
* Returns all of the necessary buffers, allocating
* as needed.
*/
int
loader_dri3_get_buffers(__DRIdrawable *driDrawable,
unsigned int format,
uint32_t *stamp,
void *loaderPrivate,
uint32_t buffer_mask,
struct __DRIimageList *buffers)
{
struct loader_dri3_drawable *draw = loaderPrivate;
struct loader_dri3_buffer *front, *back;
buffers->image_mask = 0;
buffers->front = NULL;
buffers->back = NULL;
front = NULL;
back = NULL;
if (!dri3_update_drawable(driDrawable, draw))
return false;
/* pixmaps always have front buffers */
if (draw->is_pixmap)
buffer_mask |= __DRI_IMAGE_BUFFER_FRONT;
if (buffer_mask & __DRI_IMAGE_BUFFER_FRONT) {
/* All pixmaps are owned by the server gpu.
* When we use a different gpu, we can't use the pixmap
* as buffer since it is potentially tiled a way
* our device can't understand. In this case, use
* a fake front buffer. Hopefully the pixmap
* content will get synced with the fake front
* buffer.
*/
if (draw->is_pixmap && !draw->is_different_gpu)
front = dri3_get_pixmap_buffer(driDrawable,
format,
loader_dri3_buffer_front,
draw);
else
front = dri3_get_buffer(driDrawable,
format,
loader_dri3_buffer_front,
draw);
if (!front)
return false;
} else {
dri3_free_buffers(driDrawable, loader_dri3_buffer_front, draw);
draw->have_fake_front = 0;
}
if (buffer_mask & __DRI_IMAGE_BUFFER_BACK) {
back = dri3_get_buffer(driDrawable,
format,
loader_dri3_buffer_back,
draw);
if (!back)
return false;
draw->have_back = 1;
} else {
dri3_free_buffers(driDrawable, loader_dri3_buffer_back, draw);
draw->have_back = 0;
}
if (front) {
buffers->image_mask |= __DRI_IMAGE_BUFFER_FRONT;
buffers->front = front->image;
draw->have_fake_front = draw->is_different_gpu || !draw->is_pixmap;
}
if (back) {
buffers->image_mask |= __DRI_IMAGE_BUFFER_BACK;
buffers->back = back->image;
}
draw->stamp = stamp;
return true;
}
/** loader_dri3_update_drawable_geometry
*
* Get the current drawable geometry.
*/
void
loader_dri3_update_drawable_geometry(struct loader_dri3_drawable *draw)
{
xcb_get_geometry_cookie_t geom_cookie;
xcb_get_geometry_reply_t *geom_reply;
geom_cookie = xcb_get_geometry(draw->conn, draw->drawable);
geom_reply = xcb_get_geometry_reply(draw->conn, geom_cookie, NULL);
if (geom_reply) {
draw->width = geom_reply->width;
draw->height = geom_reply->height;
draw->vtable->set_drawable_size(draw, draw->width, draw->height);
free(geom_reply);
}
}
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