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5ccd2825c7
mutter/cogl/winsys/cogl-winsys-glx.c
Chris Wilson 5ccd2825c7 glx: Precisely wait for the next vblank 
Currently the code queries the current msc then tries to approximate the
value of the next msc satisfing the modulus 2 for when to wait. This
introduces some instability as the msc may tick over during the
roundtrip leading to a 32ms wait instead of a 16ms wait. This happens
often enough to cause jerky animations, and affect gnome-shell-perf-tool.

A simpler solution is just use a single roundtrip by using WaitForMsc to
ask the driver to compute the next vblank itself.

Cc: Owen W. Taylor <otaylor@fishsoup.net>
Cc: Robert Bragg <robert@linux.intel.com>
Reviewed-by: Robert Bragg <robert@sixbynine.org>
2015-02-04 19:31:40 +00:00

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/*
* Cogl
*
* A Low Level GPU Graphics and Utilities API
*
* Copyright (C) 2007,2008,2009,2010,2011,2013 Intel Corporation.
*
* 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 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.
*
*
* Authors:
* Robert Bragg <robert@linux.intel.com>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "cogl-i18n-private.h"
#include "cogl-util.h"
#include "cogl-winsys-private.h"
#include "cogl-feature-private.h"
#include "cogl-context-private.h"
#include "cogl-framebuffer.h"
#include "cogl-swap-chain-private.h"
#include "cogl-renderer-private.h"
#include "cogl-glx-renderer-private.h"
#include "cogl-onscreen-template-private.h"
#include "cogl-glx-display-private.h"
#include "cogl-private.h"
#include "cogl-texture-2d-private.h"
#include "cogl-texture-rectangle-private.h"
#include "cogl-pipeline-opengl-private.h"
#include "cogl-frame-info-private.h"
#include "cogl-framebuffer-private.h"
#include "cogl-onscreen-private.h"
#include "cogl-swap-chain-private.h"
#include "cogl-xlib-renderer.h"
#include "cogl-util.h"
#include "cogl-winsys-glx-private.h"
#include "cogl-error-private.h"
#include "cogl-poll-private.h"
#include "cogl-version.h"
#include "cogl-glx.h"
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <fcntl.h>
#include <time.h>
#include <GL/glx.h>
#include <X11/Xlib.h>
#define COGL_ONSCREEN_X11_EVENT_MASK (StructureNotifyMask | ExposureMask)
#define MAX_GLX_CONFIG_ATTRIBS 30
typedef struct _CoglContextGLX
{
GLXDrawable current_drawable;
} CoglContextGLX;
typedef struct _CoglOnscreenXlib
{
Window xwin;
int x, y;
CoglBool is_foreign_xwin;
CoglOutput *output;
} CoglOnscreenXlib;
typedef struct _CoglOnscreenGLX
{
CoglOnscreenXlib _parent;
GLXDrawable glxwin;
uint32_t last_swap_vsync_counter;
CoglBool pending_sync_notify;
CoglBool pending_complete_notify;
CoglBool pending_resize_notify;
} CoglOnscreenGLX;
typedef struct _CoglPixmapTextureEyeGLX
{
CoglTexture *glx_tex;
CoglBool bind_tex_image_queued;
CoglBool pixmap_bound;
} CoglPixmapTextureEyeGLX;
typedef struct _CoglTexturePixmapGLX
{
GLXPixmap glx_pixmap;
CoglBool has_mipmap_space;
CoglBool can_mipmap;
CoglPixmapTextureEyeGLX left;
CoglPixmapTextureEyeGLX right;
} CoglTexturePixmapGLX;
/* Define a set of arrays containing the functions required from GL
for each winsys feature */
#define COGL_WINSYS_FEATURE_BEGIN(major_version, minor_version, \
name, namespaces, extension_names, \
feature_flags, \
winsys_feature) \
static const CoglFeatureFunction \
cogl_glx_feature_ ## name ## _funcs[] = {
#define COGL_WINSYS_FEATURE_FUNCTION(ret, name, args) \
{ G_STRINGIFY (name), G_STRUCT_OFFSET (CoglGLXRenderer, name) },
#define COGL_WINSYS_FEATURE_END() \
{ NULL, 0 }, \
};
#include "cogl-winsys-glx-feature-functions.h"
/* Define an array of features */
#undef COGL_WINSYS_FEATURE_BEGIN
#define COGL_WINSYS_FEATURE_BEGIN(major_version, minor_version, \
name, namespaces, extension_names, \
feature_flags, \
winsys_feature) \
{ major_version, minor_version, \
0, namespaces, extension_names, \
feature_flags, \
0, \
winsys_feature, \
cogl_glx_feature_ ## name ## _funcs },
#undef COGL_WINSYS_FEATURE_FUNCTION
#define COGL_WINSYS_FEATURE_FUNCTION(ret, name, args)
#undef COGL_WINSYS_FEATURE_END
#define COGL_WINSYS_FEATURE_END()
static const CoglFeatureData winsys_feature_data[] =
{
#include "cogl-winsys-glx-feature-functions.h"
};
static CoglFuncPtr
_cogl_winsys_renderer_get_proc_address (CoglRenderer *renderer,
const char *name,
CoglBool in_core)
{
CoglGLXRenderer *glx_renderer = renderer->winsys;
/* The GLX_ARB_get_proc_address extension documents that this should
* work for core functions too so we don't need to do anything
* special with in_core */
return glx_renderer->glXGetProcAddress ((const GLubyte *) name);
}
static CoglOnscreen *
find_onscreen_for_xid (CoglContext *context, uint32_t xid)
{
GList *l;
for (l = context->framebuffers; l; l = l->next)
{
CoglFramebuffer *framebuffer = l->data;
CoglOnscreenXlib *xlib_onscreen;
if (framebuffer->type != COGL_FRAMEBUFFER_TYPE_ONSCREEN)
continue;
/* Does the GLXEvent have the GLXDrawable or the X Window? */
xlib_onscreen = COGL_ONSCREEN (framebuffer)->winsys;
if (xlib_onscreen->xwin == (Window)xid)
return COGL_ONSCREEN (framebuffer);
}
return NULL;
}
static void
ensure_ust_type (CoglRenderer *renderer,
GLXDrawable drawable)
{
CoglGLXRenderer *glx_renderer = renderer->winsys;
CoglXlibRenderer *xlib_renderer = _cogl_xlib_renderer_get_data (renderer);
int64_t ust;
int64_t msc;
int64_t sbc;
struct timeval tv;
struct timespec ts;
int64_t current_system_time;
int64_t current_monotonic_time;
if (glx_renderer->ust_type != COGL_GLX_UST_IS_UNKNOWN)
return;
glx_renderer->ust_type = COGL_GLX_UST_IS_OTHER;
if (glx_renderer->glXGetSyncValues == NULL)
goto out;
if (!glx_renderer->glXGetSyncValues (xlib_renderer->xdpy, drawable,
&ust, &msc, &sbc))
goto out;
/* This is the time source that existing (buggy) linux drm drivers
* use */
gettimeofday (&tv, NULL);
current_system_time = (tv.tv_sec * G_GINT64_CONSTANT (1000000)) + tv.tv_usec;
if (current_system_time > ust - 1000000 &&
current_system_time < ust + 1000000)
{
glx_renderer->ust_type = COGL_GLX_UST_IS_GETTIMEOFDAY;
goto out;
}
/* This is the time source that the newer (fixed) linux drm
* drivers use (Linux >= 3.8) */
clock_gettime (CLOCK_MONOTONIC, &ts);
current_monotonic_time = (ts.tv_sec * G_GINT64_CONSTANT (1000000)) +
(ts.tv_nsec / G_GINT64_CONSTANT (1000));
if (current_monotonic_time > ust - 1000000 &&
current_monotonic_time < ust + 1000000)
{
glx_renderer->ust_type = COGL_GLX_UST_IS_MONOTONIC_TIME;
goto out;
}
out:
COGL_NOTE (WINSYS, "Classified OML system time as: %s",
glx_renderer->ust_type == COGL_GLX_UST_IS_GETTIMEOFDAY ? "gettimeofday" :
(glx_renderer->ust_type == COGL_GLX_UST_IS_MONOTONIC_TIME ? "monotonic" :
"other"));
return;
}
static int64_t
ust_to_nanoseconds (CoglRenderer *renderer,
GLXDrawable drawable,
int64_t ust)
{
CoglGLXRenderer *glx_renderer = renderer->winsys;
ensure_ust_type (renderer, drawable);
switch (glx_renderer->ust_type)
{
case COGL_GLX_UST_IS_UNKNOWN:
g_assert_not_reached ();
break;
case COGL_GLX_UST_IS_GETTIMEOFDAY:
case COGL_GLX_UST_IS_MONOTONIC_TIME:
return 1000 * ust;
case COGL_GLX_UST_IS_OTHER:
/* In this case the scale of UST is undefined so we can't easily
* scale to nanoseconds.
*
* For example the driver may be reporting the rdtsc CPU counter
* as UST values and so the scale would need to be determined
* empirically.
*
* Potentially we could block for a known duration within
* ensure_ust_type() to measure the timescale of UST but for now
* we just ignore unknown time sources */
return 0;
}
return 0;
}
static int64_t
_cogl_winsys_get_clock_time (CoglContext *context)
{
CoglGLXRenderer *glx_renderer = context->display->renderer->winsys;
/* We don't call ensure_ust_type() because we don't have a drawable
* to work with. cogl_get_clock_time() is documented to only work
* once a valid, non-zero, timestamp has been retrieved from Cogl.
*/
switch (glx_renderer->ust_type)
{
case COGL_GLX_UST_IS_UNKNOWN:
case COGL_GLX_UST_IS_OTHER:
return 0;
case COGL_GLX_UST_IS_GETTIMEOFDAY:
{
struct timeval tv;
gettimeofday(&tv, NULL);
return tv.tv_sec * G_GINT64_CONSTANT (1000000000) +
tv.tv_usec * G_GINT64_CONSTANT (1000);
}
case COGL_GLX_UST_IS_MONOTONIC_TIME:
{
struct timespec ts;
clock_gettime (CLOCK_MONOTONIC, &ts);
return ts.tv_sec * G_GINT64_CONSTANT (1000000000) + ts.tv_nsec;
}
}
g_assert_not_reached();
return 0;
}
static void
flush_pending_notifications_cb (void *data,
void *user_data)
{
CoglFramebuffer *framebuffer = data;
if (framebuffer->type == COGL_FRAMEBUFFER_TYPE_ONSCREEN)
{
CoglOnscreen *onscreen = COGL_ONSCREEN (framebuffer);
CoglOnscreenGLX *glx_onscreen = onscreen->winsys;
CoglBool pending_sync_notify = glx_onscreen->pending_sync_notify;
CoglBool pending_complete_notify = glx_onscreen->pending_complete_notify;
/* If swap_region is called then notifying the sync event could
* potentially immediately queue a subsequent pending notify so
* we need to clear the flag before invoking the callback */
glx_onscreen->pending_sync_notify = FALSE;
glx_onscreen->pending_complete_notify = FALSE;
if (pending_sync_notify)
{
CoglFrameInfo *info = g_queue_peek_head (&onscreen->pending_frame_infos);
_cogl_onscreen_notify_frame_sync (onscreen, info);
}
if (pending_complete_notify)
{
CoglFrameInfo *info = g_queue_pop_head (&onscreen->pending_frame_infos);
_cogl_onscreen_notify_complete (onscreen, info);
cogl_object_unref (info);
}
if (glx_onscreen->pending_resize_notify)
{
_cogl_onscreen_notify_resize (onscreen);
glx_onscreen->pending_resize_notify = FALSE;
}
}
}
static void
flush_pending_notifications_idle (void *user_data)
{
CoglContext *context = user_data;
CoglRenderer *renderer = context->display->renderer;
CoglGLXRenderer *glx_renderer = renderer->winsys;
/* This needs to be disconnected before invoking the callbacks in
* case the callbacks cause it to be queued again */
_cogl_closure_disconnect (glx_renderer->flush_notifications_idle);
glx_renderer->flush_notifications_idle = NULL;
g_list_foreach (context->framebuffers,
flush_pending_notifications_cb,
NULL);
}
static void
set_sync_pending (CoglOnscreen *onscreen)
{
CoglOnscreenGLX *glx_onscreen = onscreen->winsys;
CoglContext *context = COGL_FRAMEBUFFER (onscreen)->context;
CoglRenderer *renderer = context->display->renderer;
CoglGLXRenderer *glx_renderer = renderer->winsys;
/* We only want to dispatch sync events when the application calls
* cogl_context_dispatch so instead of immediately notifying we
* queue an idle callback */
if (!glx_renderer->flush_notifications_idle)
{
glx_renderer->flush_notifications_idle =
_cogl_poll_renderer_add_idle (renderer,
flush_pending_notifications_idle,
context,
NULL);
}
glx_onscreen->pending_sync_notify = TRUE;
}
static void
set_complete_pending (CoglOnscreen *onscreen)
{
CoglOnscreenGLX *glx_onscreen = onscreen->winsys;
CoglContext *context = COGL_FRAMEBUFFER (onscreen)->context;
CoglRenderer *renderer = context->display->renderer;
CoglGLXRenderer *glx_renderer = renderer->winsys;
/* We only want to notify swap completion when the application calls
* cogl_context_dispatch so instead of immediately notifying we
* queue an idle callback */
if (!glx_renderer->flush_notifications_idle)
{
glx_renderer->flush_notifications_idle =
_cogl_poll_renderer_add_idle (renderer,
flush_pending_notifications_idle,
context,
NULL);
}
glx_onscreen->pending_complete_notify = TRUE;
}
static void
notify_swap_buffers (CoglContext *context, GLXBufferSwapComplete *swap_event)
{
CoglOnscreen *onscreen = find_onscreen_for_xid (context, (uint32_t)swap_event->drawable);
CoglOnscreenGLX *glx_onscreen;
if (!onscreen)
return;
glx_onscreen = onscreen->winsys;
/* We only want to notify that the swap is complete when the
application calls cogl_context_dispatch so instead of immediately
notifying we'll set a flag to remember to notify later */
set_sync_pending (onscreen);
if (swap_event->ust != 0)
{
CoglFrameInfo *info = g_queue_peek_head (&onscreen->pending_frame_infos);
info->presentation_time =
ust_to_nanoseconds (context->display->renderer,
glx_onscreen->glxwin,
swap_event->ust);
}
set_complete_pending (onscreen);
}
static void
update_output (CoglOnscreen *onscreen)
{
CoglOnscreenXlib *xlib_onscreen = onscreen->winsys;
CoglFramebuffer *framebuffer = COGL_FRAMEBUFFER (onscreen);
CoglContext *context = framebuffer->context;
CoglDisplay *display = context->display;
CoglOutput *output;
int width, height;
width = cogl_framebuffer_get_width (framebuffer);
height = cogl_framebuffer_get_height (framebuffer);
output = _cogl_xlib_renderer_output_for_rectangle (display->renderer,
xlib_onscreen->x,
xlib_onscreen->y,
width, height);
if (xlib_onscreen->output != output)
{
if (xlib_onscreen->output)
cogl_object_unref (xlib_onscreen->output);
xlib_onscreen->output = output;
if (output)
cogl_object_ref (xlib_onscreen->output);
}
}
static void
notify_resize (CoglContext *context,
XConfigureEvent *configure_event)
{
CoglOnscreen *onscreen = find_onscreen_for_xid (context,
configure_event->window);
CoglFramebuffer *framebuffer = COGL_FRAMEBUFFER (onscreen);
CoglRenderer *renderer = context->display->renderer;
CoglGLXRenderer *glx_renderer = renderer->winsys;
CoglOnscreenGLX *glx_onscreen;
CoglOnscreenXlib *xlib_onscreen;
if (!onscreen)
return;
glx_onscreen = onscreen->winsys;
xlib_onscreen = onscreen->winsys;
_cogl_framebuffer_winsys_update_size (framebuffer,
configure_event->width,
configure_event->height);
/* We only want to notify that a resize happened when the
* application calls cogl_context_dispatch so instead of immediately
* notifying we queue an idle callback */
if (!glx_renderer->flush_notifications_idle)
{
glx_renderer->flush_notifications_idle =
_cogl_poll_renderer_add_idle (renderer,
flush_pending_notifications_idle,
context,
NULL);
}
glx_onscreen->pending_resize_notify = TRUE;
if (!xlib_onscreen->is_foreign_xwin)
{
int x, y;
if (configure_event->send_event)
{
x = configure_event->x;
y = configure_event->y;
}
else
{
Window child;
XTranslateCoordinates (configure_event->display,
configure_event->window,
DefaultRootWindow (configure_event->display),
0, 0, &x, &y, &child);
}
xlib_onscreen->x = x;
xlib_onscreen->y = y;
update_output (onscreen);
}
}
static CoglFilterReturn
glx_event_filter_cb (XEvent *xevent, void *data)
{
CoglContext *context = data;
#ifdef GLX_INTEL_swap_event
CoglGLXRenderer *glx_renderer;
#endif
if (xevent->type == ConfigureNotify)
{
notify_resize (context,
&xevent->xconfigure);
/* we let ConfigureNotify pass through */
return COGL_FILTER_CONTINUE;
}
#ifdef GLX_INTEL_swap_event
glx_renderer = context->display->renderer->winsys;
if (xevent->type == (glx_renderer->glx_event_base + GLX_BufferSwapComplete))
{
GLXBufferSwapComplete *swap_event = (GLXBufferSwapComplete *) xevent;
notify_swap_buffers (context, swap_event);
/* remove SwapComplete events from the queue */
return COGL_FILTER_REMOVE;
}
#endif /* GLX_INTEL_swap_event */
if (xevent->type == Expose)
{
CoglOnscreen *onscreen =
find_onscreen_for_xid (context, xevent->xexpose.window);
if (onscreen)
{
CoglOnscreenDirtyInfo info;
info.x = xevent->xexpose.x;
info.y = xevent->xexpose.y;
info.width = xevent->xexpose.width;
info.height = xevent->xexpose.height;
_cogl_onscreen_queue_dirty (onscreen, &info);
}
return COGL_FILTER_CONTINUE;
}
return COGL_FILTER_CONTINUE;
}
static void
_cogl_winsys_renderer_disconnect (CoglRenderer *renderer)
{
CoglGLXRenderer *glx_renderer = renderer->winsys;
_cogl_xlib_renderer_disconnect (renderer);
if (glx_renderer->libgl_module)
g_module_close (glx_renderer->libgl_module);
g_slice_free (CoglGLXRenderer, renderer->winsys);
}
static CoglBool
update_all_outputs (CoglRenderer *renderer)
{
GList *l;
_COGL_GET_CONTEXT (context, FALSE);
if (context->display == NULL) /* during connection */
return FALSE;
if (context->display->renderer != renderer)
return FALSE;
for (l = context->framebuffers; l; l = l->next)
{
CoglFramebuffer *framebuffer = l->data;
if (framebuffer->type != COGL_FRAMEBUFFER_TYPE_ONSCREEN)
continue;
update_output (COGL_ONSCREEN (framebuffer));
}
return TRUE;
}
static void
_cogl_winsys_renderer_outputs_changed (CoglRenderer *renderer)
{
update_all_outputs (renderer);
}
static CoglBool
resolve_core_glx_functions (CoglRenderer *renderer,
CoglError **error)
{
CoglGLXRenderer *glx_renderer;
glx_renderer = renderer->winsys;
if (!g_module_symbol (glx_renderer->libgl_module, "glXQueryExtension",
(void **) &glx_renderer->glXQueryExtension) ||
!g_module_symbol (glx_renderer->libgl_module, "glXQueryVersion",
(void **) &glx_renderer->glXQueryVersion) ||
!g_module_symbol (glx_renderer->libgl_module, "glXQueryExtensionsString",
(void **) &glx_renderer->glXQueryExtensionsString) ||
(!g_module_symbol (glx_renderer->libgl_module, "glXGetProcAddress",
(void **) &glx_renderer->glXGetProcAddress) &&
!g_module_symbol (glx_renderer->libgl_module, "glXGetProcAddressARB",
(void **) &glx_renderer->glXGetProcAddress)) ||
!g_module_symbol (glx_renderer->libgl_module, "glXQueryDrawable",
(void **) &glx_renderer->glXQueryDrawable))
{
_cogl_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_INIT,
"Failed to resolve required GLX symbol");
return FALSE;
}
return TRUE;
}
static void
update_base_winsys_features (CoglRenderer *renderer)
{
CoglGLXRenderer *glx_renderer = renderer->winsys;
CoglXlibRenderer *xlib_renderer =
_cogl_xlib_renderer_get_data (renderer);
const char *glx_extensions;
int default_screen;
char **split_extensions;
int i;
default_screen = DefaultScreen (xlib_renderer->xdpy);
glx_extensions =
glx_renderer->glXQueryExtensionsString (xlib_renderer->xdpy,
default_screen);
COGL_NOTE (WINSYS, " GLX Extensions: %s", glx_extensions);
split_extensions = g_strsplit (glx_extensions, " ", 0 /* max_tokens */);
for (i = 0; i < G_N_ELEMENTS (winsys_feature_data); i++)
if (_cogl_feature_check (renderer,
"GLX", winsys_feature_data + i,
glx_renderer->glx_major,
glx_renderer->glx_minor,
COGL_DRIVER_GL, /* the driver isn't used */
split_extensions,
glx_renderer))
{
glx_renderer->legacy_feature_flags |=
winsys_feature_data[i].feature_flags;
if (winsys_feature_data[i].winsys_feature)
COGL_FLAGS_SET (glx_renderer->base_winsys_features,
winsys_feature_data[i].winsys_feature,
TRUE);
}
g_strfreev (split_extensions);
/* Note: the GLX_SGI_video_sync spec explicitly states this extension
* only works for direct contexts. */
if (!glx_renderer->is_direct)
{
glx_renderer->glXGetVideoSync = NULL;
glx_renderer->glXWaitVideoSync = NULL;
COGL_FLAGS_SET (glx_renderer->base_winsys_features,
COGL_WINSYS_FEATURE_VBLANK_COUNTER,
FALSE);
}
COGL_FLAGS_SET (glx_renderer->base_winsys_features,
COGL_WINSYS_FEATURE_MULTIPLE_ONSCREEN,
TRUE);
if (glx_renderer->glXWaitVideoSync ||
glx_renderer->glXWaitForMsc)
COGL_FLAGS_SET (glx_renderer->base_winsys_features,
COGL_WINSYS_FEATURE_VBLANK_WAIT,
TRUE);
}
static CoglBool
_cogl_winsys_renderer_connect (CoglRenderer *renderer,
CoglError **error)
{
CoglGLXRenderer *glx_renderer;
CoglXlibRenderer *xlib_renderer;
renderer->winsys = g_slice_new0 (CoglGLXRenderer);
glx_renderer = renderer->winsys;
xlib_renderer = _cogl_xlib_renderer_get_data (renderer);
if (!_cogl_xlib_renderer_connect (renderer, error))
goto error;
if (renderer->driver != COGL_DRIVER_GL &&
renderer->driver != COGL_DRIVER_GL3)
{
_cogl_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_INIT,
"GLX Backend can only be used in conjunction with OpenGL");
goto error;
}
glx_renderer->libgl_module = g_module_open (COGL_GL_LIBNAME,
G_MODULE_BIND_LAZY);
if (glx_renderer->libgl_module == NULL)
{
_cogl_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_INIT,
"Failed to dynamically open the OpenGL library");
goto error;
}
if (!resolve_core_glx_functions (renderer, error))
goto error;
if (!glx_renderer->glXQueryExtension (xlib_renderer->xdpy,
&glx_renderer->glx_error_base,
&glx_renderer->glx_event_base))
{
_cogl_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_INIT,
"XServer appears to lack required GLX support");
goto error;
}
/* XXX: Note: For a long time Mesa exported a hybrid GLX, exporting
* extensions specified to require GLX 1.3, but still reporting 1.2
* via glXQueryVersion. */
if (!glx_renderer->glXQueryVersion (xlib_renderer->xdpy,
&glx_renderer->glx_major,
&glx_renderer->glx_minor)
|| !(glx_renderer->glx_major == 1 && glx_renderer->glx_minor >= 2))
{
_cogl_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_INIT,
"XServer appears to lack required GLX 1.2 support");
goto error;
}
update_base_winsys_features (renderer);
glx_renderer->dri_fd = -1;
return TRUE;
error:
_cogl_winsys_renderer_disconnect (renderer);
return FALSE;
}
static CoglBool
update_winsys_features (CoglContext *context, CoglError **error)
{
CoglGLXDisplay *glx_display = context->display->winsys;
CoglGLXRenderer *glx_renderer = context->display->renderer->winsys;
_COGL_RETURN_VAL_IF_FAIL (glx_display->glx_context, FALSE);
if (!_cogl_context_update_features (context, error))
return FALSE;
memcpy (context->winsys_features,
glx_renderer->base_winsys_features,
sizeof (context->winsys_features));
context->feature_flags |= glx_renderer->legacy_feature_flags;
context->feature_flags |= COGL_FEATURE_ONSCREEN_MULTIPLE;
COGL_FLAGS_SET (context->features,
COGL_FEATURE_ID_ONSCREEN_MULTIPLE, TRUE);
if (glx_renderer->glXCopySubBuffer || context->glBlitFramebuffer)
{
CoglGpuInfo *info = &context->gpu;
CoglGpuInfoArchitecture arch = info->architecture;
COGL_FLAGS_SET (context->winsys_features, COGL_WINSYS_FEATURE_SWAP_REGION, TRUE);
/*
* "The "drisw" binding in Mesa for loading sofware renderers is
* broken, and neither glBlitFramebuffer nor glXCopySubBuffer
* work correctly."
* - ajax
* - https://bugzilla.gnome.org/show_bug.cgi?id=674208
*
* This is broken in software Mesa at least as of 7.10 and got
* fixed in Mesa 10.1
*/
if (info->driver_package == COGL_GPU_INFO_DRIVER_PACKAGE_MESA &&
info->driver_package_version < COGL_VERSION_ENCODE (10, 1, 0) &&
(arch == COGL_GPU_INFO_ARCHITECTURE_LLVMPIPE ||
arch == COGL_GPU_INFO_ARCHITECTURE_SOFTPIPE ||
arch == COGL_GPU_INFO_ARCHITECTURE_SWRAST))
{
COGL_FLAGS_SET (context->winsys_features,
COGL_WINSYS_FEATURE_SWAP_REGION, FALSE);
}
}
/* Note: glXCopySubBuffer and glBlitFramebuffer won't be throttled
* by the SwapInterval so we have to throttle swap_region requests
* manually... */
if (_cogl_winsys_has_feature (COGL_WINSYS_FEATURE_SWAP_REGION) &&
_cogl_winsys_has_feature (COGL_WINSYS_FEATURE_VBLANK_WAIT))
COGL_FLAGS_SET (context->winsys_features,
COGL_WINSYS_FEATURE_SWAP_REGION_THROTTLE, TRUE);
if (_cogl_winsys_has_feature (COGL_WINSYS_FEATURE_SYNC_AND_COMPLETE_EVENT))
{
COGL_FLAGS_SET (context->winsys_features,
COGL_WINSYS_FEATURE_SWAP_BUFFERS_EVENT, TRUE);
/* TODO: remove this deprecated feature */
COGL_FLAGS_SET (context->features,
COGL_FEATURE_ID_SWAP_BUFFERS_EVENT,
TRUE);
COGL_FLAGS_SET (context->features,
COGL_FEATURE_ID_PRESENTATION_TIME,
TRUE);
}
/* We'll manually handle queueing dirty events in response to
* Expose events from X */
COGL_FLAGS_SET (context->private_features,
COGL_PRIVATE_FEATURE_DIRTY_EVENTS,
TRUE);
if (_cogl_winsys_has_feature (COGL_WINSYS_FEATURE_BUFFER_AGE))
COGL_FLAGS_SET (context->features, COGL_FEATURE_ID_BUFFER_AGE, TRUE);
return TRUE;
}
static void
glx_attributes_from_framebuffer_config (CoglDisplay *display,
CoglFramebufferConfig *config,
int *attributes)
{
CoglGLXRenderer *glx_renderer = display->renderer->winsys;
int i = 0;
attributes[i++] = GLX_DRAWABLE_TYPE;
attributes[i++] = GLX_WINDOW_BIT;
attributes[i++] = GLX_RENDER_TYPE;
attributes[i++] = GLX_RGBA_BIT;
attributes[i++] = GLX_DOUBLEBUFFER;
attributes[i++] = GL_TRUE;
attributes[i++] = GLX_RED_SIZE;
attributes[i++] = 1;
attributes[i++] = GLX_GREEN_SIZE;
attributes[i++] = 1;
attributes[i++] = GLX_BLUE_SIZE;
attributes[i++] = 1;
attributes[i++] = GLX_ALPHA_SIZE;
attributes[i++] = config->swap_chain->has_alpha ? 1 : GLX_DONT_CARE;
attributes[i++] = GLX_DEPTH_SIZE;
attributes[i++] = 1;
attributes[i++] = GLX_STENCIL_SIZE;
attributes[i++] = config->need_stencil ? 1: GLX_DONT_CARE;
if (config->stereo_enabled)
{
attributes[i++] = GLX_STEREO;
attributes[i++] = TRUE;
}
if (glx_renderer->glx_major == 1 && glx_renderer->glx_minor >= 4 &&
config->samples_per_pixel)
{
attributes[i++] = GLX_SAMPLE_BUFFERS;
attributes[i++] = 1;
attributes[i++] = GLX_SAMPLES;
attributes[i++] = config->samples_per_pixel;
}
attributes[i++] = None;
g_assert (i < MAX_GLX_CONFIG_ATTRIBS);
}
/* It seems the GLX spec never defined an invalid GLXFBConfig that
* we could overload as an indication of error, so we have to return
* an explicit boolean status. */
static CoglBool
find_fbconfig (CoglDisplay *display,
CoglFramebufferConfig *config,
GLXFBConfig *config_ret,
CoglError **error)
{
CoglXlibRenderer *xlib_renderer =
_cogl_xlib_renderer_get_data (display->renderer);
CoglGLXRenderer *glx_renderer = display->renderer->winsys;
GLXFBConfig *configs = NULL;
int n_configs;
static int attributes[MAX_GLX_CONFIG_ATTRIBS];
CoglBool ret = TRUE;
int xscreen_num = DefaultScreen (xlib_renderer->xdpy);
glx_attributes_from_framebuffer_config (display, config, attributes);
configs = glx_renderer->glXChooseFBConfig (xlib_renderer->xdpy,
xscreen_num,
attributes,
&n_configs);
if (!configs || n_configs == 0)
{
_cogl_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_CREATE_CONTEXT,
"Failed to find any compatible fbconfigs");
ret = FALSE;
goto done;
}
if (config->swap_chain->has_alpha)
{
int i;
for (i = 0; i < n_configs; i++)
{
XVisualInfo *vinfo;
vinfo = glx_renderer->glXGetVisualFromFBConfig (xlib_renderer->xdpy,
configs[i]);
if (vinfo == NULL)
continue;
if (vinfo->depth == 32 &&
(vinfo->red_mask | vinfo->green_mask | vinfo->blue_mask)
!= 0xffffffff)
{
COGL_NOTE (WINSYS, "Found an ARGB FBConfig [index:%d]", i);
*config_ret = configs[i];
goto done;
}
}
_cogl_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_CREATE_CONTEXT,
"Unable to find fbconfig with rgba visual");
ret = FALSE;
goto done;
}
else
{
COGL_NOTE (WINSYS, "Using the first available FBConfig");
*config_ret = configs[0];
}
done:
XFree (configs);
return ret;
}
static GLXContext
create_gl3_context (CoglDisplay *display,
GLXFBConfig fb_config)
{
CoglXlibRenderer *xlib_renderer =
_cogl_xlib_renderer_get_data (display->renderer);
CoglGLXRenderer *glx_renderer = display->renderer->winsys;
/* We want a core profile 3.1 context with no deprecated features */
static const int attrib_list[] =
{
GLX_CONTEXT_MAJOR_VERSION_ARB, 3,
GLX_CONTEXT_MINOR_VERSION_ARB, 1,
GLX_CONTEXT_PROFILE_MASK_ARB, GLX_CONTEXT_CORE_PROFILE_BIT_ARB,
GLX_CONTEXT_FLAGS_ARB, GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB,
None
};
/* Make sure that the display supports the GLX_ARB_create_context
extension */
if (glx_renderer->glXCreateContextAttribs == NULL)
return NULL;
return glx_renderer->glXCreateContextAttribs (xlib_renderer->xdpy,
fb_config,
NULL /* share_context */,
True, /* direct */
attrib_list);
}
static CoglBool
create_context (CoglDisplay *display, CoglError **error)
{
CoglGLXDisplay *glx_display = display->winsys;
CoglXlibRenderer *xlib_renderer =
_cogl_xlib_renderer_get_data (display->renderer);
CoglGLXRenderer *glx_renderer = display->renderer->winsys;
CoglBool support_transparent_windows =
display->onscreen_template->config.swap_chain->has_alpha;
GLXFBConfig config;
CoglError *fbconfig_error = NULL;
XSetWindowAttributes attrs;
XVisualInfo *xvisinfo;
GLXDrawable dummy_drawable;
CoglXlibTrapState old_state;
_COGL_RETURN_VAL_IF_FAIL (glx_display->glx_context == NULL, TRUE);
glx_display->found_fbconfig =
find_fbconfig (display, &display->onscreen_template->config, &config,
&fbconfig_error);
if (!glx_display->found_fbconfig)
{
_cogl_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_CREATE_CONTEXT,
"Unable to find suitable fbconfig for the GLX context: %s",
fbconfig_error->message);
cogl_error_free (fbconfig_error);
return FALSE;
}
glx_display->fbconfig = config;
glx_display->fbconfig_has_rgba_visual = support_transparent_windows;
COGL_NOTE (WINSYS, "Creating GLX Context (display: %p)",
xlib_renderer->xdpy);
if (display->renderer->driver == COGL_DRIVER_GL3)
glx_display->glx_context = create_gl3_context (display, config);
else
glx_display->glx_context =
glx_renderer->glXCreateNewContext (xlib_renderer->xdpy,
config,
GLX_RGBA_TYPE,
NULL,
True);
if (glx_display->glx_context == NULL)
{
_cogl_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_CREATE_CONTEXT,
"Unable to create suitable GL context");
return FALSE;
}
glx_renderer->is_direct =
glx_renderer->glXIsDirect (xlib_renderer->xdpy, glx_display->glx_context);
COGL_NOTE (WINSYS, "Setting %s context",
glx_renderer->is_direct ? "direct" : "indirect");
/* XXX: GLX doesn't let us make a context current without a window
* so we create a dummy window that we can use while no CoglOnscreen
* framebuffer is in use.
*/
xvisinfo = glx_renderer->glXGetVisualFromFBConfig (xlib_renderer->xdpy,
config);
if (xvisinfo == NULL)
{
_cogl_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_CREATE_CONTEXT,
"Unable to retrieve the X11 visual");
return FALSE;
}
_cogl_xlib_renderer_trap_errors (display->renderer, &old_state);
attrs.override_redirect = True;
attrs.colormap = XCreateColormap (xlib_renderer->xdpy,
DefaultRootWindow (xlib_renderer->xdpy),
xvisinfo->visual,
AllocNone);
attrs.border_pixel = 0;
glx_display->dummy_xwin =
XCreateWindow (xlib_renderer->xdpy,
DefaultRootWindow (xlib_renderer->xdpy),
-100, -100, 1, 1,
0,
xvisinfo->depth,
CopyFromParent,
xvisinfo->visual,
CWOverrideRedirect | CWColormap | CWBorderPixel,
&attrs);
/* Try and create a GLXWindow to use with extensions dependent on
* GLX versions >= 1.3 that don't accept regular X Windows as GLX
* drawables. */
if (glx_renderer->glx_major == 1 && glx_renderer->glx_minor >= 3)
{
glx_display->dummy_glxwin =
glx_renderer->glXCreateWindow (xlib_renderer->xdpy,
config,
glx_display->dummy_xwin,
NULL);
}
if (glx_display->dummy_glxwin)
dummy_drawable = glx_display->dummy_glxwin;
else
dummy_drawable = glx_display->dummy_xwin;
COGL_NOTE (WINSYS, "Selecting dummy 0x%x for the GLX context",
(unsigned int) dummy_drawable);
glx_renderer->glXMakeContextCurrent (xlib_renderer->xdpy,
dummy_drawable,
dummy_drawable,
glx_display->glx_context);
XFree (xvisinfo);
if (_cogl_xlib_renderer_untrap_errors (display->renderer, &old_state))
{
_cogl_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_CREATE_CONTEXT,
"Unable to select the newly created GLX context");
return FALSE;
}
return TRUE;
}
static void
_cogl_winsys_display_destroy (CoglDisplay *display)
{
CoglGLXDisplay *glx_display = display->winsys;
CoglXlibRenderer *xlib_renderer =
_cogl_xlib_renderer_get_data (display->renderer);
CoglGLXRenderer *glx_renderer = display->renderer->winsys;
_COGL_RETURN_IF_FAIL (glx_display != NULL);
if (glx_display->glx_context)
{
glx_renderer->glXMakeContextCurrent (xlib_renderer->xdpy,
None, None, NULL);
glx_renderer->glXDestroyContext (xlib_renderer->xdpy,
glx_display->glx_context);
glx_display->glx_context = NULL;
}
if (glx_display->dummy_glxwin)
{
glx_renderer->glXDestroyWindow (xlib_renderer->xdpy,
glx_display->dummy_glxwin);
glx_display->dummy_glxwin = None;
}
if (glx_display->dummy_xwin)
{
XDestroyWindow (xlib_renderer->xdpy, glx_display->dummy_xwin);
glx_display->dummy_xwin = None;
}
g_slice_free (CoglGLXDisplay, display->winsys);
display->winsys = NULL;
}
static CoglBool
_cogl_winsys_display_setup (CoglDisplay *display,
CoglError **error)
{
CoglGLXDisplay *glx_display;
int i;
_COGL_RETURN_VAL_IF_FAIL (display->winsys == NULL, FALSE);
glx_display = g_slice_new0 (CoglGLXDisplay);
display->winsys = glx_display;
if (!create_context (display, error))
goto error;
for (i = 0; i < COGL_GLX_N_CACHED_CONFIGS; i++)
glx_display->glx_cached_configs[i].depth = -1;
return TRUE;
error:
_cogl_winsys_display_destroy (display);
return FALSE;
}
static CoglBool
_cogl_winsys_context_init (CoglContext *context, CoglError **error)
{
context->winsys = g_new0 (CoglContextGLX, 1);
cogl_xlib_renderer_add_filter (context->display->renderer,
glx_event_filter_cb,
context);
return update_winsys_features (context, error);
}
static void
_cogl_winsys_context_deinit (CoglContext *context)
{
cogl_xlib_renderer_remove_filter (context->display->renderer,
glx_event_filter_cb,
context);
g_free (context->winsys);
}
static CoglBool
_cogl_winsys_onscreen_init (CoglOnscreen *onscreen,
CoglError **error)
{
CoglFramebuffer *framebuffer = COGL_FRAMEBUFFER (onscreen);
CoglContext *context = framebuffer->context;
CoglDisplay *display = context->display;
CoglGLXDisplay *glx_display = display->winsys;
CoglXlibRenderer *xlib_renderer =
_cogl_xlib_renderer_get_data (display->renderer);
CoglGLXRenderer *glx_renderer = display->renderer->winsys;
Window xwin;
CoglOnscreenXlib *xlib_onscreen;
CoglOnscreenGLX *glx_onscreen;
GLXFBConfig fbconfig;
CoglError *fbconfig_error = NULL;
_COGL_RETURN_VAL_IF_FAIL (glx_display->glx_context, FALSE);
if (!find_fbconfig (display, &framebuffer->config,
&fbconfig,
&fbconfig_error))
{
_cogl_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_CREATE_CONTEXT,
"Unable to find suitable fbconfig for the GLX context: %s",
fbconfig_error->message);
cogl_error_free (fbconfig_error);
return FALSE;
}
/* Update the real number of samples_per_pixel now that we have
* found an fbconfig... */
if (framebuffer->config.samples_per_pixel)
{
int samples;
int status = glx_renderer->glXGetFBConfigAttrib (xlib_renderer->xdpy,
fbconfig,
GLX_SAMPLES,
&samples);
g_return_val_if_fail (status == Success, TRUE);
framebuffer->samples_per_pixel = samples;
}
/* FIXME: We need to explicitly Select for ConfigureNotify events.
* For foreign windows we need to be careful not to mess up any
* existing event mask.
* We need to document that for windows we create then toolkits
* must be careful not to clear event mask bits that we select.
*/
/* XXX: Note we ignore the user's original width/height when
* given a foreign X window. */
if (onscreen->foreign_xid)
{
Status status;
CoglXlibTrapState state;
XWindowAttributes attr;
int xerror;
xwin = onscreen->foreign_xid;
_cogl_xlib_renderer_trap_errors (display->renderer, &state);
status = XGetWindowAttributes (xlib_renderer->xdpy, xwin, &attr);
XSync (xlib_renderer->xdpy, False);
xerror = _cogl_xlib_renderer_untrap_errors (display->renderer, &state);
if (status == 0 || xerror)
{
char message[1000];
XGetErrorText (xlib_renderer->xdpy, xerror, message, sizeof(message));
_cogl_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_CREATE_ONSCREEN,
"Unable to query geometry of foreign xid 0x%08lX: %s",
xwin, message);
return FALSE;
}
_cogl_framebuffer_winsys_update_size (framebuffer,
attr.width, attr.height);
/* Make sure the app selects for the events we require... */
onscreen->foreign_update_mask_callback (onscreen,
COGL_ONSCREEN_X11_EVENT_MASK,
onscreen->foreign_update_mask_data);
}
else
{
int width;
int height;
CoglXlibTrapState state;
XVisualInfo *xvisinfo;
XSetWindowAttributes xattr;
unsigned long mask;
int xerror;
width = cogl_framebuffer_get_width (framebuffer);
height = cogl_framebuffer_get_height (framebuffer);
_cogl_xlib_renderer_trap_errors (display->renderer, &state);
xvisinfo = glx_renderer->glXGetVisualFromFBConfig (xlib_renderer->xdpy,
fbconfig);
if (xvisinfo == NULL)
{
_cogl_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_CREATE_ONSCREEN,
"Unable to retrieve the X11 visual of context's "
"fbconfig");
return FALSE;
}
/* window attributes */
xattr.background_pixel = WhitePixel (xlib_renderer->xdpy,
DefaultScreen (xlib_renderer->xdpy));
xattr.border_pixel = 0;
/* XXX: is this an X resource that we are leaking‽... */
xattr.colormap = XCreateColormap (xlib_renderer->xdpy,
DefaultRootWindow (xlib_renderer->xdpy),
xvisinfo->visual,
AllocNone);
xattr.event_mask = COGL_ONSCREEN_X11_EVENT_MASK;
mask = CWBorderPixel | CWColormap | CWEventMask;
xwin = XCreateWindow (xlib_renderer->xdpy,
DefaultRootWindow (xlib_renderer->xdpy),
0, 0,
width, height,
0,
xvisinfo->depth,
InputOutput,
xvisinfo->visual,
mask, &xattr);
XFree (xvisinfo);
XSync (xlib_renderer->xdpy, False);
xerror = _cogl_xlib_renderer_untrap_errors (display->renderer, &state);
if (xerror)
{
char message[1000];
XGetErrorText (xlib_renderer->xdpy, xerror,
message, sizeof (message));
_cogl_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_CREATE_ONSCREEN,
"X error while creating Window for CoglOnscreen: %s",
message);
return FALSE;
}
}
onscreen->winsys = g_slice_new0 (CoglOnscreenGLX);
xlib_onscreen = onscreen->winsys;
glx_onscreen = onscreen->winsys;
xlib_onscreen->xwin = xwin;
xlib_onscreen->is_foreign_xwin = onscreen->foreign_xid ? TRUE : FALSE;
/* Try and create a GLXWindow to use with extensions dependent on
* GLX versions >= 1.3 that don't accept regular X Windows as GLX
* drawables. */
if (glx_renderer->glx_major == 1 && glx_renderer->glx_minor >= 3)
{
glx_onscreen->glxwin =
glx_renderer->glXCreateWindow (xlib_renderer->xdpy,
fbconfig,
xlib_onscreen->xwin,
NULL);
}
#ifdef GLX_INTEL_swap_event
if (_cogl_winsys_has_feature (COGL_WINSYS_FEATURE_SYNC_AND_COMPLETE_EVENT))
{
GLXDrawable drawable =
glx_onscreen->glxwin ? glx_onscreen->glxwin : xlib_onscreen->xwin;
/* similarly to above, we unconditionally select this event
* because we rely on it to advance the master clock, and
* drive redraw/relayout, animations and event handling.
*/
glx_renderer->glXSelectEvent (xlib_renderer->xdpy,
drawable,
GLX_BUFFER_SWAP_COMPLETE_INTEL_MASK);
}
#endif /* GLX_INTEL_swap_event */
return TRUE;
}
static void
_cogl_winsys_onscreen_deinit (CoglOnscreen *onscreen)
{
CoglFramebuffer *framebuffer = COGL_FRAMEBUFFER (onscreen);
CoglContext *context = framebuffer->context;
CoglContextGLX *glx_context = context->winsys;
CoglGLXDisplay *glx_display = context->display->winsys;
CoglXlibRenderer *xlib_renderer =
_cogl_xlib_renderer_get_data (context->display->renderer);
CoglGLXRenderer *glx_renderer = context->display->renderer->winsys;
CoglXlibTrapState old_state;
CoglOnscreenXlib *xlib_onscreen = onscreen->winsys;
CoglOnscreenGLX *glx_onscreen = onscreen->winsys;
GLXDrawable drawable;
/* If we never successfully allocated then there's nothing to do */
if (glx_onscreen == NULL)
return;
if (xlib_onscreen->output != NULL)
{
cogl_object_unref (xlib_onscreen->output);
xlib_onscreen->output = NULL;
}
_cogl_xlib_renderer_trap_errors (context->display->renderer, &old_state);
drawable =
glx_onscreen->glxwin == None ? xlib_onscreen->xwin : glx_onscreen->glxwin;
/* Cogl always needs a valid context bound to something so if we are
* destroying the onscreen that is currently bound we'll switch back
* to the dummy drawable. Although the documentation for
* glXDestroyWindow states that a currently bound window won't
* actually be destroyed until it is unbound, it looks like this
* doesn't work if the X window itself is destroyed */
if (drawable == glx_context->current_drawable)
{
GLXDrawable dummy_drawable = (glx_display->dummy_glxwin == None ?
glx_display->dummy_xwin :
glx_display->dummy_glxwin);
glx_renderer->glXMakeContextCurrent (xlib_renderer->xdpy,
dummy_drawable,
dummy_drawable,
glx_display->glx_context);
glx_context->current_drawable = dummy_drawable;
}
if (glx_onscreen->glxwin != None)
{
glx_renderer->glXDestroyWindow (xlib_renderer->xdpy,
glx_onscreen->glxwin);
glx_onscreen->glxwin = None;
}
if (!xlib_onscreen->is_foreign_xwin && xlib_onscreen->xwin != None)
{
XDestroyWindow (xlib_renderer->xdpy, xlib_onscreen->xwin);
xlib_onscreen->xwin = None;
}
else
xlib_onscreen->xwin = None;
XSync (xlib_renderer->xdpy, False);
_cogl_xlib_renderer_untrap_errors (context->display->renderer, &old_state);
g_slice_free (CoglOnscreenGLX, onscreen->winsys);
onscreen->winsys = NULL;
}
static void
_cogl_winsys_onscreen_bind (CoglOnscreen *onscreen)
{
CoglContext *context = COGL_FRAMEBUFFER (onscreen)->context;
CoglContextGLX *glx_context = context->winsys;
CoglGLXDisplay *glx_display = context->display->winsys;
CoglXlibRenderer *xlib_renderer =
_cogl_xlib_renderer_get_data (context->display->renderer);
CoglGLXRenderer *glx_renderer = context->display->renderer->winsys;
CoglOnscreenXlib *xlib_onscreen = onscreen->winsys;
CoglOnscreenGLX *glx_onscreen = onscreen->winsys;
CoglXlibTrapState old_state;
GLXDrawable drawable;
drawable =
glx_onscreen->glxwin ? glx_onscreen->glxwin : xlib_onscreen->xwin;
if (glx_context->current_drawable == drawable)
return;
_cogl_xlib_renderer_trap_errors (context->display->renderer, &old_state);
COGL_NOTE (WINSYS,
"MakeContextCurrent dpy: %p, window: 0x%x (%s), context: %p",
xlib_renderer->xdpy,
(unsigned int) drawable,
xlib_onscreen->is_foreign_xwin ? "foreign" : "native",
glx_display->glx_context);
glx_renderer->glXMakeContextCurrent (xlib_renderer->xdpy,
drawable,
drawable,
glx_display->glx_context);
/* In case we are using GLX_SGI_swap_control for vblank syncing
* we need call glXSwapIntervalSGI here to make sure that it
* affects the current drawable.
*
* Note: we explicitly set to 0 when we aren't using the swap
* interval to synchronize since some drivers have a default
* swap interval of 1. Sadly some drivers even ignore requests
* to disable the swap interval.
*
* NB: glXSwapIntervalSGI applies to the context not the
* drawable which is why we can't just do this once when the
* framebuffer is allocated.
*
* FIXME: We should check for GLX_EXT_swap_control which allows
* per framebuffer swap intervals. GLX_MESA_swap_control also
* allows per-framebuffer swap intervals but the semantics tend
* to be more muddled since Mesa drivers tend to expose both the
* MESA and SGI extensions which should technically be mutually
* exclusive.
*/
if (glx_renderer->glXSwapInterval)
{
CoglFramebuffer *fb = COGL_FRAMEBUFFER (onscreen);
if (fb->config.swap_throttled)
glx_renderer->glXSwapInterval (1);
else
glx_renderer->glXSwapInterval (0);
}
XSync (xlib_renderer->xdpy, False);
/* FIXME: We should be reporting a CoglError here
*/
if (_cogl_xlib_renderer_untrap_errors (context->display->renderer,
&old_state))
{
g_warning ("X Error received while making drawable 0x%08lX current",
drawable);
return;
}
glx_context->current_drawable = drawable;
}
static void
_cogl_winsys_wait_for_gpu (CoglOnscreen *onscreen)
{
CoglFramebuffer *framebuffer = COGL_FRAMEBUFFER (onscreen);
CoglContext *ctx = framebuffer->context;
ctx->glFinish ();
}
static void
_cogl_winsys_wait_for_vblank (CoglOnscreen *onscreen)
{
CoglFramebuffer *framebuffer = COGL_FRAMEBUFFER (onscreen);
CoglContext *ctx = framebuffer->context;
CoglGLXRenderer *glx_renderer;
CoglXlibRenderer *xlib_renderer;
glx_renderer = ctx->display->renderer->winsys;
xlib_renderer = _cogl_xlib_renderer_get_data (ctx->display->renderer);
if (glx_renderer->glXWaitForMsc ||
glx_renderer->glXGetVideoSync)
{
CoglFrameInfo *info = g_queue_peek_tail (&onscreen->pending_frame_infos);
if (glx_renderer->glXWaitForMsc)
{
CoglOnscreenGLX *glx_onscreen = onscreen->winsys;
Drawable drawable = glx_onscreen->glxwin;
int64_t ust;
int64_t msc;
int64_t sbc;
glx_renderer->glXWaitForMsc (xlib_renderer->xdpy, drawable,
0, 1, 0,
&ust, &msc, &sbc);
info->presentation_time = ust_to_nanoseconds (ctx->display->renderer,
drawable,
ust);
}
else
{
uint32_t current_count;
struct timespec ts;
glx_renderer->glXGetVideoSync (&current_count);
glx_renderer->glXWaitVideoSync (2,
(current_count + 1) % 2,
&current_count);
clock_gettime (CLOCK_MONOTONIC, &ts);
info->presentation_time =
ts.tv_sec * G_GINT64_CONSTANT (1000000000) + ts.tv_nsec;
}
}
}
static uint32_t
_cogl_winsys_get_vsync_counter (CoglContext *ctx)
{
uint32_t video_sync_count;
CoglGLXRenderer *glx_renderer;
glx_renderer = ctx->display->renderer->winsys;
glx_renderer->glXGetVideoSync (&video_sync_count);
return video_sync_count;
}
#ifndef GLX_BACK_BUFFER_AGE_EXT
#define GLX_BACK_BUFFER_AGE_EXT 0x20F4
#endif
static int
_cogl_winsys_onscreen_get_buffer_age (CoglOnscreen *onscreen)
{
CoglFramebuffer *framebuffer = COGL_FRAMEBUFFER (onscreen);
CoglContext *context = framebuffer->context;
CoglXlibRenderer *xlib_renderer = _cogl_xlib_renderer_get_data (context->display->renderer);
CoglGLXRenderer *glx_renderer = context->display->renderer->winsys;
CoglOnscreenGLX *glx_onscreen = onscreen->winsys;
CoglOnscreenXlib *xlib_onscreen = onscreen->winsys;
GLXDrawable drawable = glx_onscreen->glxwin ? glx_onscreen->glxwin : xlib_onscreen->xwin;
unsigned int age;
if (!_cogl_winsys_has_feature (COGL_WINSYS_FEATURE_BUFFER_AGE))
return 0;
glx_renderer->glXQueryDrawable (xlib_renderer->xdpy, drawable, GLX_BACK_BUFFER_AGE_EXT, &age);
return age;
}
static void
set_frame_info_output (CoglOnscreen *onscreen,
CoglOutput *output)
{
CoglFrameInfo *info = g_queue_peek_tail (&onscreen->pending_frame_infos);
info->output = output;
if (output)
{
float refresh_rate = cogl_output_get_refresh_rate (output);
if (refresh_rate != 0.0)
info->refresh_rate = refresh_rate;
}
}
static void
_cogl_winsys_onscreen_swap_region (CoglOnscreen *onscreen,
const int *user_rectangles,
int n_rectangles)
{
CoglFramebuffer *framebuffer = COGL_FRAMEBUFFER (onscreen);
CoglContext *context = framebuffer->context;
CoglXlibRenderer *xlib_renderer =
_cogl_xlib_renderer_get_data (context->display->renderer);
CoglGLXRenderer *glx_renderer = context->display->renderer->winsys;
CoglOnscreenXlib *xlib_onscreen = onscreen->winsys;
CoglOnscreenGLX *glx_onscreen = onscreen->winsys;
GLXDrawable drawable =
glx_onscreen->glxwin ? glx_onscreen->glxwin : xlib_onscreen->xwin;
uint32_t end_frame_vsync_counter = 0;
CoglBool have_counter;
CoglBool can_wait;
int x_min = 0, x_max = 0, y_min = 0, y_max = 0;
/*
* We assume that glXCopySubBuffer is synchronized which means it won't prevent multiple
* blits per retrace if they can all be performed in the blanking period. If that's the
* case then we still want to use the vblank sync menchanism but
* we only need it to throttle redraws.
*/
CoglBool blit_sub_buffer_is_synchronized =
_cogl_winsys_has_feature (COGL_WINSYS_FEATURE_SWAP_REGION_SYNCHRONIZED);
int framebuffer_width = cogl_framebuffer_get_width (framebuffer);
int framebuffer_height = cogl_framebuffer_get_height (framebuffer);
int *rectangles = g_alloca (sizeof (int) * n_rectangles * 4);
int i;
/* glXCopySubBuffer expects rectangles relative to the bottom left corner but
* we are given rectangles relative to the top left so we need to flip
* them... */
memcpy (rectangles, user_rectangles, sizeof (int) * n_rectangles * 4);
for (i = 0; i < n_rectangles; i++)
{
int *rect = &rectangles[4 * i];
if (i == 0)
{
x_min = rect[0];
x_max = rect[0] + rect[2];
y_min = rect[1];
y_max = rect[1] + rect[3];
}
else
{
x_min = MIN (x_min, rect[0]);
x_max = MAX (x_max, rect[0] + rect[2]);
y_min = MIN (y_min, rect[1]);
y_max = MAX (y_max, rect[1] + rect[3]);
}
rect[1] = framebuffer_height - rect[1] - rect[3];
}
_cogl_framebuffer_flush_state (framebuffer,
framebuffer,
COGL_FRAMEBUFFER_STATE_BIND);
if (framebuffer->config.swap_throttled)
{
have_counter =
_cogl_winsys_has_feature (COGL_WINSYS_FEATURE_VBLANK_COUNTER);
can_wait = _cogl_winsys_has_feature (COGL_WINSYS_FEATURE_VBLANK_WAIT);
}
else
{
have_counter = FALSE;
can_wait = FALSE;
}
/* We need to ensure that all the rendering is done, otherwise
* redraw operations that are slower than the framerate can
* queue up in the pipeline during a heavy animation, causing a
* larger and larger backlog of rendering visible as lag to the
* user.
*
* For an exaggerated example consider rendering at 60fps (so 16ms
* per frame) and you have a really slow frame that takes 160ms to
* render, even though painting the scene and issuing the commands
* to the GPU takes no time at all. If all we did was use the
* video_sync extension to throttle the painting done by the CPU
* then every 16ms we would have another frame queued up even though
* the GPU has only rendered one tenth of the current frame. By the
* time the GPU would get to the 2nd frame there would be 9 frames
* waiting to be rendered.
*
* The problem is that we don't currently have a good way to throttle
* the GPU, only the CPU so we have to resort to synchronizing the
* GPU with the CPU to throttle it.
*
* Note: since calling glFinish() and synchronizing the CPU with
* the GPU is far from ideal, we hope that this is only a short
* term solution.
* - One idea is to using sync objects to track render
* completion so we can throttle the backlog (ideally with an
* additional extension that lets us get notifications in our
* mainloop instead of having to busy wait for the
* completion.)
* - Another option is to support clipped redraws by reusing the
* contents of old back buffers such that we can flip instead
* of using a blit and then we can use GLX_INTEL_swap_events
* to throttle. For this though we would still probably want an
* additional extension so we can report the limited region of
* the window damage to X/compositors.
*/
_cogl_winsys_wait_for_gpu (onscreen);
if (blit_sub_buffer_is_synchronized && have_counter && can_wait)
{
end_frame_vsync_counter = _cogl_winsys_get_vsync_counter (context);
/* If we have the GLX_SGI_video_sync extension then we can
* be a bit smarter about how we throttle blits by avoiding
* any waits if we can see that the video sync count has
* already progressed. */
if (glx_onscreen->last_swap_vsync_counter == end_frame_vsync_counter)
_cogl_winsys_wait_for_vblank (onscreen);
}
else if (can_wait)
_cogl_winsys_wait_for_vblank (onscreen);
if (glx_renderer->glXCopySubBuffer)
{
Display *xdpy = xlib_renderer->xdpy;
int i;
for (i = 0; i < n_rectangles; i++)
{
int *rect = &rectangles[4 * i];
glx_renderer->glXCopySubBuffer (xdpy, drawable,
rect[0], rect[1], rect[2], rect[3]);
}
}
else if (context->glBlitFramebuffer)
{
int i;
/* XXX: checkout how this state interacts with the code to use
* glBlitFramebuffer in Neil's texture atlasing branch */
/* glBlitFramebuffer is affected by the scissor so we need to
* ensure we have flushed an empty clip stack to get rid of it.
* We also mark that the clip state is dirty so that it will be
* flushed to the correct state the next time something is
* drawn */
_cogl_clip_stack_flush (NULL, framebuffer);
context->current_draw_buffer_changes |= COGL_FRAMEBUFFER_STATE_CLIP;
context->glDrawBuffer (GL_FRONT);
for (i = 0; i < n_rectangles; i++)
{
int *rect = &rectangles[4 * i];
int x2 = rect[0] + rect[2];
int y2 = rect[1] + rect[3];
context->glBlitFramebuffer (rect[0], rect[1], x2, y2,
rect[0], rect[1], x2, y2,
GL_COLOR_BUFFER_BIT, GL_NEAREST);
}
context->glDrawBuffer (context->current_gl_draw_buffer);
}
/* NB: unlike glXSwapBuffers, glXCopySubBuffer and
* glBlitFramebuffer don't issue an implicit glFlush() so we
* have to flush ourselves if we want the request to complete in
* a finite amount of time since otherwise the driver can batch
* the command indefinitely. */
context->glFlush ();
/* NB: It's important we save the counter we read before acting on
* the swap request since if we are mixing and matching different
* swap methods between frames we don't want to read the timer e.g.
* after calling glFinish() some times and not for others.
*
* In other words; this way we consistently save the time at the end
* of the applications frame such that the counter isn't muddled by
* the varying costs of different swap methods.
*/
if (have_counter)
glx_onscreen->last_swap_vsync_counter = end_frame_vsync_counter;
if (!xlib_onscreen->is_foreign_xwin)
{
CoglOutput *output;
x_min = CLAMP (x_min, 0, framebuffer_width);
x_max = CLAMP (x_max, 0, framebuffer_width);
y_min = CLAMP (y_min, 0, framebuffer_width);
y_max = CLAMP (y_max, 0, framebuffer_height);
output =
_cogl_xlib_renderer_output_for_rectangle (context->display->renderer,
xlib_onscreen->x + x_min,
xlib_onscreen->y + y_min,
x_max - x_min,
y_max - y_min);
set_frame_info_output (onscreen, output);
}
/* XXX: we don't get SwapComplete events based on how we implement
* the _swap_region() API but if cogl-onscreen.c knows we are
* handling _SYNC and _COMPLETE events in the winsys then we need to
* send fake events in this case.
*/
if (_cogl_winsys_has_feature (COGL_WINSYS_FEATURE_SYNC_AND_COMPLETE_EVENT))
{
set_sync_pending (onscreen);
set_complete_pending (onscreen);
}
}
static void
_cogl_winsys_onscreen_swap_buffers_with_damage (CoglOnscreen *onscreen,
const int *rectangles,
int n_rectangles)
{
CoglFramebuffer *framebuffer = COGL_FRAMEBUFFER (onscreen);
CoglContext *context = framebuffer->context;
CoglXlibRenderer *xlib_renderer =
_cogl_xlib_renderer_get_data (context->display->renderer);
CoglGLXRenderer *glx_renderer = context->display->renderer->winsys;
CoglOnscreenXlib *xlib_onscreen = onscreen->winsys;
CoglOnscreenGLX *glx_onscreen = onscreen->winsys;
CoglBool have_counter;
GLXDrawable drawable;
/* XXX: theoretically this shouldn't be necessary but at least with
* the Intel drivers we have see that if we don't call
* glXMakeContextCurrent for the drawable we are swapping then
* we get a BadDrawable error from the X server. */
_cogl_framebuffer_flush_state (framebuffer,
framebuffer,
COGL_FRAMEBUFFER_STATE_BIND);
drawable = glx_onscreen->glxwin ? glx_onscreen->glxwin : xlib_onscreen->xwin;
if (framebuffer->config.swap_throttled)
{
uint32_t end_frame_vsync_counter = 0;
have_counter =
_cogl_winsys_has_feature (COGL_WINSYS_FEATURE_VBLANK_COUNTER);
/* If the swap_region API is also being used then we need to track
* the vsync counter for each swap request so we can manually
* throttle swap_region requests. */
if (have_counter)
end_frame_vsync_counter = _cogl_winsys_get_vsync_counter (context);
if (!glx_renderer->glXSwapInterval)
{
CoglBool can_wait =
_cogl_winsys_has_feature (COGL_WINSYS_FEATURE_VBLANK_WAIT);
/* If we are going to wait for VBLANK manually, we not only
* need to flush out pending drawing to the GPU before we
* sleep, we need to wait for it to finish. Otherwise, we
* may end up with the situation:
*
* - We finish drawing - GPU drawing continues
* - We go to sleep - GPU drawing continues
* VBLANK - We call glXSwapBuffers - GPU drawing continues
* - GPU drawing continues
* - Swap buffers happens
*
* Producing a tear. Calling glFinish() first will cause us
* to properly wait for the next VBLANK before we swap. This
* obviously does not happen when we use _GLX_SWAP and let
* the driver do the right thing
*/
_cogl_winsys_wait_for_gpu (onscreen);
if (have_counter && can_wait)
{
if (glx_onscreen->last_swap_vsync_counter ==
end_frame_vsync_counter)
_cogl_winsys_wait_for_vblank (onscreen);
}
else if (can_wait)
_cogl_winsys_wait_for_vblank (onscreen);
}
}
else
have_counter = FALSE;
glx_renderer->glXSwapBuffers (xlib_renderer->xdpy, drawable);
if (have_counter)
glx_onscreen->last_swap_vsync_counter =
_cogl_winsys_get_vsync_counter (context);
set_frame_info_output (onscreen, xlib_onscreen->output);
}
static uint32_t
_cogl_winsys_onscreen_x11_get_window_xid (CoglOnscreen *onscreen)
{
CoglOnscreenXlib *xlib_onscreen = onscreen->winsys;
return xlib_onscreen->xwin;
}
static void
_cogl_winsys_onscreen_update_swap_throttled (CoglOnscreen *onscreen)
{
CoglContext *context = COGL_FRAMEBUFFER (onscreen)->context;
CoglContextGLX *glx_context = context->winsys;
CoglOnscreenGLX *glx_onscreen = onscreen->winsys;
CoglOnscreenXlib *xlib_onscreen = onscreen->winsys;
GLXDrawable drawable =
glx_onscreen->glxwin ? glx_onscreen->glxwin : xlib_onscreen->xwin;
if (glx_context->current_drawable != drawable)
return;
glx_context->current_drawable = 0;
_cogl_winsys_onscreen_bind (onscreen);
}
static void
_cogl_winsys_onscreen_set_visibility (CoglOnscreen *onscreen,
CoglBool visibility)
{
CoglContext *context = COGL_FRAMEBUFFER (onscreen)->context;
CoglXlibRenderer *xlib_renderer =
_cogl_xlib_renderer_get_data (context->display->renderer);
CoglOnscreenXlib *xlib_onscreen = onscreen->winsys;
if (visibility)
XMapWindow (xlib_renderer->xdpy, xlib_onscreen->xwin);
else
XUnmapWindow (xlib_renderer->xdpy, xlib_onscreen->xwin);
}
static void
_cogl_winsys_onscreen_set_resizable (CoglOnscreen *onscreen,
CoglBool resizable)
{
CoglFramebuffer *framebuffer = COGL_FRAMEBUFFER (onscreen);
CoglContext *context = framebuffer->context;
CoglXlibRenderer *xlib_renderer =
_cogl_xlib_renderer_get_data (context->display->renderer);
CoglOnscreenXlib *xlib_onscreen = onscreen->winsys;
XSizeHints *size_hints = XAllocSizeHints ();
if (resizable)
{
/* TODO: Add cogl_onscreen_request_minimum_size () */
size_hints->min_width = 1;
size_hints->min_height = 1;
size_hints->max_width = INT_MAX;
size_hints->max_height = INT_MAX;
}
else
{
int width = cogl_framebuffer_get_width (framebuffer);
int height = cogl_framebuffer_get_height (framebuffer);
size_hints->min_width = width;
size_hints->min_height = height;
size_hints->max_width = width;
size_hints->max_height = height;
}
XSetWMNormalHints (xlib_renderer->xdpy, xlib_onscreen->xwin, size_hints);
XFree (size_hints);
}
/* XXX: This is a particularly hacky _cogl_winsys interface... */
static XVisualInfo *
_cogl_winsys_xlib_get_visual_info (void)
{
CoglGLXDisplay *glx_display;
CoglXlibRenderer *xlib_renderer;
CoglGLXRenderer *glx_renderer;
_COGL_GET_CONTEXT (ctx, NULL);
_COGL_RETURN_VAL_IF_FAIL (ctx->display->winsys, FALSE);
glx_display = ctx->display->winsys;
xlib_renderer = _cogl_xlib_renderer_get_data (ctx->display->renderer);
glx_renderer = ctx->display->renderer->winsys;
if (!glx_display->found_fbconfig)
return NULL;
return glx_renderer->glXGetVisualFromFBConfig (xlib_renderer->xdpy,
glx_display->fbconfig);
}
static CoglBool
get_fbconfig_for_depth (CoglContext *context,
unsigned int depth,
CoglBool stereo,
GLXFBConfig *fbconfig_ret,
CoglBool *can_mipmap_ret)
{
CoglXlibRenderer *xlib_renderer;
CoglGLXRenderer *glx_renderer;
CoglGLXDisplay *glx_display;
Display *dpy;
GLXFBConfig *fbconfigs;
int n_elements, i;
int db, stencil, alpha, mipmap, rgba, value;
int spare_cache_slot = 0;
CoglBool found = FALSE;
xlib_renderer = _cogl_xlib_renderer_get_data (context->display->renderer);
glx_renderer = context->display->renderer->winsys;
glx_display = context->display->winsys;
/* Check if we've already got a cached config for this depth and stereo */
for (i = 0; i < COGL_GLX_N_CACHED_CONFIGS; i++)
if (glx_display->glx_cached_configs[i].depth == -1)
spare_cache_slot = i;
else if (glx_display->glx_cached_configs[i].depth == depth &&
glx_display->glx_cached_configs[i].stereo == stereo)
{
*fbconfig_ret = glx_display->glx_cached_configs[i].fb_config;
*can_mipmap_ret = glx_display->glx_cached_configs[i].can_mipmap;
return glx_display->glx_cached_configs[i].found;
}
dpy = xlib_renderer->xdpy;
fbconfigs = glx_renderer->glXGetFBConfigs (dpy, DefaultScreen (dpy),
&n_elements);
db = G_MAXSHORT;
stencil = G_MAXSHORT;
mipmap = 0;
rgba = 0;
for (i = 0; i < n_elements; i++)
{
XVisualInfo *vi;
int visual_depth;
vi = glx_renderer->glXGetVisualFromFBConfig (dpy, fbconfigs[i]);
if (vi == NULL)
continue;
visual_depth = vi->depth;
XFree (vi);
if (visual_depth != depth)
continue;
glx_renderer->glXGetFBConfigAttrib (dpy,
fbconfigs[i],
GLX_ALPHA_SIZE,
&alpha);
glx_renderer->glXGetFBConfigAttrib (dpy,
fbconfigs[i],
GLX_BUFFER_SIZE,
&value);
if (value != depth && (value - alpha) != depth)
continue;
glx_renderer->glXGetFBConfigAttrib (dpy,
fbconfigs[i],
GLX_STEREO,
&value);
if (!!value != !!stereo)
continue;
if (glx_renderer->glx_major == 1 && glx_renderer->glx_minor >= 4)
{
glx_renderer->glXGetFBConfigAttrib (dpy,
fbconfigs[i],
GLX_SAMPLES,
&value);
if (value > 1)
continue;
}
value = 0;
if (depth == 32)
{
glx_renderer->glXGetFBConfigAttrib (dpy,
fbconfigs[i],
GLX_BIND_TO_TEXTURE_RGBA_EXT,
&value);
if (value)
rgba = 1;
}
if (!value)
{
if (rgba)
continue;
glx_renderer->glXGetFBConfigAttrib (dpy,
fbconfigs[i],
GLX_BIND_TO_TEXTURE_RGB_EXT,
&value);
if (!value)
continue;
}
glx_renderer->glXGetFBConfigAttrib (dpy,
fbconfigs[i],
GLX_DOUBLEBUFFER,
&value);
if (value > db)
continue;
db = value;
glx_renderer->glXGetFBConfigAttrib (dpy,
fbconfigs[i],
GLX_STENCIL_SIZE,
&value);
if (value > stencil)
continue;
stencil = value;
/* glGenerateMipmap is defined in the offscreen extension */
if (cogl_has_feature (context, COGL_FEATURE_ID_OFFSCREEN))
{
glx_renderer->glXGetFBConfigAttrib (dpy,
fbconfigs[i],
GLX_BIND_TO_MIPMAP_TEXTURE_EXT,
&value);
if (value < mipmap)
continue;
mipmap = value;
}
*fbconfig_ret = fbconfigs[i];
*can_mipmap_ret = mipmap;
found = TRUE;
}
if (n_elements)
XFree (fbconfigs);
glx_display->glx_cached_configs[spare_cache_slot].depth = depth;
glx_display->glx_cached_configs[spare_cache_slot].found = found;
glx_display->glx_cached_configs[spare_cache_slot].fb_config = *fbconfig_ret;
glx_display->glx_cached_configs[spare_cache_slot].can_mipmap = mipmap;
return found;
}
static CoglBool
should_use_rectangle (CoglContext *context)
{
if (context->rectangle_state == COGL_WINSYS_RECTANGLE_STATE_UNKNOWN)
{
if (cogl_has_feature (context, COGL_FEATURE_ID_TEXTURE_RECTANGLE))
{
const char *rect_env;
/* Use the rectangle only if it is available and either:
the COGL_PIXMAP_TEXTURE_RECTANGLE environment variable is
set to 'force'
*or*
the env var is set to 'allow' or not set and NPOTs textures
are not available */
context->rectangle_state =
cogl_has_feature (context, COGL_FEATURE_ID_TEXTURE_NPOT) ?
COGL_WINSYS_RECTANGLE_STATE_DISABLE :
COGL_WINSYS_RECTANGLE_STATE_ENABLE;
if ((rect_env = g_getenv ("COGL_PIXMAP_TEXTURE_RECTANGLE")) ||
/* For compatibility, we'll also look at the old Clutter
environment variable */
(rect_env = g_getenv ("CLUTTER_PIXMAP_TEXTURE_RECTANGLE")))
{
if (g_ascii_strcasecmp (rect_env, "force") == 0)
context->rectangle_state =
COGL_WINSYS_RECTANGLE_STATE_ENABLE;
else if (g_ascii_strcasecmp (rect_env, "disable") == 0)
context->rectangle_state =
COGL_WINSYS_RECTANGLE_STATE_DISABLE;
else if (g_ascii_strcasecmp (rect_env, "allow"))
g_warning ("Unknown value for COGL_PIXMAP_TEXTURE_RECTANGLE, "
"should be 'force' or 'disable'");
}
}
else
context->rectangle_state = COGL_WINSYS_RECTANGLE_STATE_DISABLE;
}
return context->rectangle_state == COGL_WINSYS_RECTANGLE_STATE_ENABLE;
}
static CoglBool
try_create_glx_pixmap (CoglContext *context,
CoglTexturePixmapX11 *tex_pixmap,
CoglBool mipmap)
{
CoglTexturePixmapGLX *glx_tex_pixmap = tex_pixmap->winsys;
CoglRenderer *renderer;
CoglXlibRenderer *xlib_renderer;
CoglGLXRenderer *glx_renderer;
Display *dpy;
/* We have to initialize this *opaque* variable because gcc tries to
* be too smart for its own good and warns that the variable may be
* used uninitialized otherwise. */
GLXFBConfig fb_config = (GLXFBConfig)0;
int attribs[7];
int i = 0;
GLenum target;
CoglXlibTrapState trap_state;
unsigned int depth = tex_pixmap->depth;
Visual* visual = tex_pixmap->visual;
renderer = context->display->renderer;
xlib_renderer = _cogl_xlib_renderer_get_data (renderer);
glx_renderer = renderer->winsys;
dpy = xlib_renderer->xdpy;
if (!get_fbconfig_for_depth (context, depth,
tex_pixmap->stereo_mode != COGL_TEXTURE_PIXMAP_MONO,
&fb_config,
&glx_tex_pixmap->can_mipmap))
{
COGL_NOTE (TEXTURE_PIXMAP, "No suitable FBConfig found for depth %i",
depth);
return FALSE;
}
if (should_use_rectangle (context))
{
target = GLX_TEXTURE_RECTANGLE_EXT;
glx_tex_pixmap->can_mipmap = FALSE;
}
else
target = GLX_TEXTURE_2D_EXT;
if (!glx_tex_pixmap->can_mipmap)
mipmap = FALSE;
attribs[i++] = GLX_TEXTURE_FORMAT_EXT;
/* Check whether an alpha channel is used by comparing the total
* number of 1-bits in color masks against the color depth requested
* by the client.
*/
if (_cogl_util_popcountl (visual->red_mask |
visual->green_mask |
visual->blue_mask) == depth)
attribs[i++] = GLX_TEXTURE_FORMAT_RGB_EXT;
else
attribs[i++] = GLX_TEXTURE_FORMAT_RGBA_EXT;
attribs[i++] = GLX_MIPMAP_TEXTURE_EXT;
attribs[i++] = mipmap;
attribs[i++] = GLX_TEXTURE_TARGET_EXT;
attribs[i++] = target;
attribs[i++] = None;
/* We need to trap errors from glXCreatePixmap because it can
* sometimes fail during normal usage. For example on NVidia it gets
* upset if you try to create two GLXPixmaps for the same drawable.
*/
_cogl_xlib_renderer_trap_errors (renderer, &trap_state);
glx_tex_pixmap->glx_pixmap =
glx_renderer->glXCreatePixmap (dpy,
fb_config,
tex_pixmap->pixmap,
attribs);
glx_tex_pixmap->has_mipmap_space = mipmap;
XSync (dpy, False);
if (_cogl_xlib_renderer_untrap_errors (renderer, &trap_state))
{
COGL_NOTE (TEXTURE_PIXMAP, "Failed to create pixmap for %p", tex_pixmap);
_cogl_xlib_renderer_trap_errors (renderer, &trap_state);
glx_renderer->glXDestroyPixmap (dpy, glx_tex_pixmap->glx_pixmap);
XSync (dpy, False);
_cogl_xlib_renderer_untrap_errors (renderer, &trap_state);
glx_tex_pixmap->glx_pixmap = None;
return FALSE;
}
return TRUE;
}
static CoglBool
_cogl_winsys_texture_pixmap_x11_create (CoglTexturePixmapX11 *tex_pixmap)
{
CoglTexturePixmapGLX *glx_tex_pixmap;
CoglContext *ctx = COGL_TEXTURE (tex_pixmap)->context;
if (!_cogl_winsys_has_feature (COGL_WINSYS_FEATURE_TEXTURE_FROM_PIXMAP))
{
tex_pixmap->winsys = NULL;
return FALSE;
}
glx_tex_pixmap = g_new0 (CoglTexturePixmapGLX, 1);
glx_tex_pixmap->glx_pixmap = None;
glx_tex_pixmap->can_mipmap = FALSE;
glx_tex_pixmap->has_mipmap_space = FALSE;
glx_tex_pixmap->left.glx_tex = NULL;
glx_tex_pixmap->right.glx_tex = NULL;
glx_tex_pixmap->left.bind_tex_image_queued = TRUE;
glx_tex_pixmap->right.bind_tex_image_queued = TRUE;
glx_tex_pixmap->left.pixmap_bound = FALSE;
glx_tex_pixmap->right.pixmap_bound = FALSE;
tex_pixmap->winsys = glx_tex_pixmap;
if (!try_create_glx_pixmap (ctx, tex_pixmap, FALSE))
{
tex_pixmap->winsys = NULL;
g_free (glx_tex_pixmap);
return FALSE;
}
return TRUE;
}
static void
free_glx_pixmap (CoglContext *context,
CoglTexturePixmapGLX *glx_tex_pixmap)
{
CoglXlibTrapState trap_state;
CoglRenderer *renderer;
CoglXlibRenderer *xlib_renderer;
CoglGLXRenderer *glx_renderer;
renderer = context->display->renderer;
xlib_renderer = _cogl_xlib_renderer_get_data (renderer);
glx_renderer = renderer->winsys;
if (glx_tex_pixmap->left.pixmap_bound)
glx_renderer->glXReleaseTexImage (xlib_renderer->xdpy,
glx_tex_pixmap->glx_pixmap,
GLX_FRONT_LEFT_EXT);
if (glx_tex_pixmap->right.pixmap_bound)
glx_renderer->glXReleaseTexImage (xlib_renderer->xdpy,
glx_tex_pixmap->glx_pixmap,
GLX_FRONT_RIGHT_EXT);
/* FIXME - we need to trap errors and synchronize here because
* of ordering issues between the XPixmap destruction and the
* GLXPixmap destruction.
*
* If the X pixmap is destroyed, the GLX pixmap is destroyed as
* well immediately, and thus, when Cogl calls glXDestroyPixmap()
* it'll cause a BadDrawable error.
*
* this is technically a bug in the X server, which should not
* destroy either pixmaps until the call to glXDestroyPixmap(); so
* at some point we should revisit this code and remove the
* trap+sync after verifying that the destruction is indeed safe.
*
* for reference, see:
* http://bugzilla.clutter-project.org/show_bug.cgi?id=2324
*/
_cogl_xlib_renderer_trap_errors (renderer, &trap_state);
glx_renderer->glXDestroyPixmap (xlib_renderer->xdpy,
glx_tex_pixmap->glx_pixmap);
XSync (xlib_renderer->xdpy, False);
_cogl_xlib_renderer_untrap_errors (renderer, &trap_state);
glx_tex_pixmap->glx_pixmap = None;
glx_tex_pixmap->left.pixmap_bound = FALSE;
glx_tex_pixmap->right.pixmap_bound = FALSE;
}
static void
_cogl_winsys_texture_pixmap_x11_free (CoglTexturePixmapX11 *tex_pixmap)
{
CoglTexturePixmapGLX *glx_tex_pixmap;
if (!tex_pixmap->winsys)
return;
glx_tex_pixmap = tex_pixmap->winsys;
free_glx_pixmap (COGL_TEXTURE (tex_pixmap)->context, glx_tex_pixmap);
if (glx_tex_pixmap->left.glx_tex)
cogl_object_unref (glx_tex_pixmap->left.glx_tex);
if (glx_tex_pixmap->right.glx_tex)
cogl_object_unref (glx_tex_pixmap->right.glx_tex);
tex_pixmap->winsys = NULL;
g_free (glx_tex_pixmap);
}
static CoglBool
_cogl_winsys_texture_pixmap_x11_update (CoglTexturePixmapX11 *tex_pixmap,
CoglTexturePixmapStereoMode stereo_mode,
CoglBool needs_mipmap)
{
CoglTexture *tex = COGL_TEXTURE (tex_pixmap);
CoglContext *ctx = COGL_TEXTURE (tex_pixmap)->context;
CoglTexturePixmapGLX *glx_tex_pixmap = tex_pixmap->winsys;
CoglPixmapTextureEyeGLX *texture_info;
int buffer;
CoglGLXRenderer *glx_renderer;
if (stereo_mode == COGL_TEXTURE_PIXMAP_RIGHT)
{
texture_info = &glx_tex_pixmap->right;
buffer = GLX_FRONT_RIGHT_EXT;
}
else
{
texture_info = &glx_tex_pixmap->left;
buffer = GLX_FRONT_LEFT_EXT;
}
/* If we don't have a GLX pixmap then fallback */
if (glx_tex_pixmap->glx_pixmap == None)
return FALSE;
glx_renderer = ctx->display->renderer->winsys;
/* Lazily create a texture to hold the pixmap */
if (texture_info->glx_tex == NULL)
{
CoglPixelFormat texture_format;
CoglError *error = NULL;
texture_format = (tex_pixmap->depth >= 32 ?
COGL_PIXEL_FORMAT_RGBA_8888_PRE :
COGL_PIXEL_FORMAT_RGB_888);
if (should_use_rectangle (ctx))
{
texture_info->glx_tex = COGL_TEXTURE (
cogl_texture_rectangle_new_with_size (ctx,
tex->width,
tex->height));
_cogl_texture_set_internal_format (tex, texture_format);
if (cogl_texture_allocate (texture_info->glx_tex, &error))
COGL_NOTE (TEXTURE_PIXMAP, "Created a texture rectangle for %p",
tex_pixmap);
else
{
COGL_NOTE (TEXTURE_PIXMAP, "Falling back for %p because a "
"texture rectangle could not be created: %s",
tex_pixmap, error->message);
cogl_error_free (error);
free_glx_pixmap (ctx, glx_tex_pixmap);
return FALSE;
}
}
else
{
texture_info->glx_tex = COGL_TEXTURE (
cogl_texture_2d_new_with_size (ctx,
tex->width,
tex->height));
_cogl_texture_set_internal_format (tex, texture_format);
if (cogl_texture_allocate (texture_info->glx_tex, &error))
COGL_NOTE (TEXTURE_PIXMAP, "Created a texture 2d for %p",
tex_pixmap);
else
{
COGL_NOTE (TEXTURE_PIXMAP, "Falling back for %p because a "
"texture 2d could not be created: %s",
tex_pixmap, error->message);
cogl_error_free (error);
free_glx_pixmap (ctx, glx_tex_pixmap);
return FALSE;
}
}
}
if (needs_mipmap)
{
/* If we can't support mipmapping then temporarily fallback */
if (!glx_tex_pixmap->can_mipmap)
return FALSE;
/* Recreate the GLXPixmap if it wasn't previously created with a
* mipmap tree */
if (!glx_tex_pixmap->has_mipmap_space)
{
free_glx_pixmap (ctx, glx_tex_pixmap);
COGL_NOTE (TEXTURE_PIXMAP, "Recreating GLXPixmap with mipmap "
"support for %p", tex_pixmap);
if (!try_create_glx_pixmap (ctx, tex_pixmap, TRUE))
{
/* If the pixmap failed then we'll permanently fallback
* to using XImage. This shouldn't happen. */
COGL_NOTE (TEXTURE_PIXMAP, "Falling back to XGetImage "
"updates for %p because creating the GLXPixmap "
"with mipmap support failed", tex_pixmap);
if (texture_info->glx_tex)
cogl_object_unref (texture_info->glx_tex);
return FALSE;
}
glx_tex_pixmap->left.bind_tex_image_queued = TRUE;
glx_tex_pixmap->right.bind_tex_image_queued = TRUE;
}
}
if (texture_info->bind_tex_image_queued)
{
GLuint gl_handle, gl_target;
CoglXlibRenderer *xlib_renderer =
_cogl_xlib_renderer_get_data (ctx->display->renderer);
cogl_texture_get_gl_texture (texture_info->glx_tex,
&gl_handle, &gl_target);
COGL_NOTE (TEXTURE_PIXMAP, "Rebinding GLXPixmap for %p", tex_pixmap);
_cogl_bind_gl_texture_transient (gl_target, gl_handle, FALSE);
if (texture_info->pixmap_bound)
glx_renderer->glXReleaseTexImage (xlib_renderer->xdpy,
glx_tex_pixmap->glx_pixmap,
buffer);
glx_renderer->glXBindTexImage (xlib_renderer->xdpy,
glx_tex_pixmap->glx_pixmap,
buffer,
NULL);
/* According to the recommended usage in the spec for
* GLX_EXT_texture_pixmap we should release the texture after
* we've finished drawing with it and it is undefined what
* happens if you render to a pixmap that is bound to a texture.
* However that would require the texture backend to know when
* Cogl has finished painting and it may be more expensive to
* keep unbinding the texture. Leaving it bound appears to work
* on Mesa and NVidia drivers and it is also what Compiz does so
* it is probably ok */
texture_info->bind_tex_image_queued = FALSE;
texture_info->pixmap_bound = TRUE;
_cogl_texture_2d_externally_modified (texture_info->glx_tex);
}
return TRUE;
}
static void
_cogl_winsys_texture_pixmap_x11_damage_notify (CoglTexturePixmapX11 *tex_pixmap)
{
CoglTexturePixmapGLX *glx_tex_pixmap = tex_pixmap->winsys;
glx_tex_pixmap->left.bind_tex_image_queued = TRUE;
glx_tex_pixmap->right.bind_tex_image_queued = TRUE;
}
static CoglTexture *
_cogl_winsys_texture_pixmap_x11_get_texture (CoglTexturePixmapX11 *tex_pixmap,
CoglTexturePixmapStereoMode stereo_mode)
{
CoglTexturePixmapGLX *glx_tex_pixmap = tex_pixmap->winsys;
if (stereo_mode == COGL_TEXTURE_PIXMAP_RIGHT)
return glx_tex_pixmap->right.glx_tex;
else
return glx_tex_pixmap->left.glx_tex;
}
static CoglWinsysVtable _cogl_winsys_vtable =
{
.id = COGL_WINSYS_ID_GLX,
.name = "GLX",
.constraints = (COGL_RENDERER_CONSTRAINT_USES_X11 |
COGL_RENDERER_CONSTRAINT_USES_XLIB),
.renderer_get_proc_address = _cogl_winsys_renderer_get_proc_address,
.renderer_connect = _cogl_winsys_renderer_connect,
.renderer_disconnect = _cogl_winsys_renderer_disconnect,
.renderer_outputs_changed = _cogl_winsys_renderer_outputs_changed,
.display_setup = _cogl_winsys_display_setup,
.display_destroy = _cogl_winsys_display_destroy,
.context_init = _cogl_winsys_context_init,
.context_deinit = _cogl_winsys_context_deinit,
.context_get_clock_time = _cogl_winsys_get_clock_time,
.xlib_get_visual_info = _cogl_winsys_xlib_get_visual_info,
.onscreen_init = _cogl_winsys_onscreen_init,
.onscreen_deinit = _cogl_winsys_onscreen_deinit,
.onscreen_bind = _cogl_winsys_onscreen_bind,
.onscreen_swap_buffers_with_damage =
_cogl_winsys_onscreen_swap_buffers_with_damage,
.onscreen_swap_region = _cogl_winsys_onscreen_swap_region,
.onscreen_get_buffer_age = _cogl_winsys_onscreen_get_buffer_age,
.onscreen_update_swap_throttled =
_cogl_winsys_onscreen_update_swap_throttled,
.onscreen_x11_get_window_xid =
_cogl_winsys_onscreen_x11_get_window_xid,
.onscreen_set_visibility = _cogl_winsys_onscreen_set_visibility,
.onscreen_set_resizable =
_cogl_winsys_onscreen_set_resizable,
/* X11 tfp support... */
/* XXX: instead of having a rather monolithic winsys vtable we could
* perhaps look for a way to separate these... */
.texture_pixmap_x11_create =
_cogl_winsys_texture_pixmap_x11_create,
.texture_pixmap_x11_free =
_cogl_winsys_texture_pixmap_x11_free,
.texture_pixmap_x11_update =
_cogl_winsys_texture_pixmap_x11_update,
.texture_pixmap_x11_damage_notify =
_cogl_winsys_texture_pixmap_x11_damage_notify,
.texture_pixmap_x11_get_texture =
_cogl_winsys_texture_pixmap_x11_get_texture,
};
/* XXX: we use a function because no doubt someone will complain
* about using c99 member initializers because they aren't portable
* to windows. We want to avoid having to rigidly follow the real
* order of members since some members are #ifdefd and we'd have
* to mirror the #ifdefing to add padding etc. For any winsys that
* can assume the platform has a sane compiler then we can just use
* c99 initializers for insane platforms they can initialize
* the members by name in a function.
*/
const CoglWinsysVtable *
_cogl_winsys_glx_get_vtable (void)
{
return &_cogl_winsys_vtable;
}
GLXContext
cogl_glx_context_get_glx_context (CoglContext *context)
{
CoglGLXDisplay *glx_display = context->display->winsys;
return glx_display->glx_context;
}
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