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mutter/cogl/winsys/cogl-winsys-glx.c
Robert Bragg a945890de6 Workaround drisw bug where clipped redraws don't work 
This detects when we are running on any of Mesa's software rasterizer
backends and disables use of glBlitFramebuffer and glXCopySubBuffer.
Both of these currently result in full-screen copies so there's little
point in using these to optimize how much of the screen we present.

To help ensure we re-evaluate this workaround periodically we have added
a comment marker of "ONGOING BUG" above the workaround and added a note
to our RELEASING document that says we should grep for this marker and
write a NEWS section about ongoing bug workarounds.

https://bugzilla.gnome.org/show_bug.cgi?id=674208

Reviewed-by: Neil Roberts <neil@linux.intel.com>

(cherry picked from commit 11f2f6ebb42398978ec8dd92b3c332ae8140a728)
2012-08-06 14:27:42 +01:00

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/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2007,2008,2009,2010,2011 Intel Corporation.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*
*
* Authors:
* Robert Bragg <robert@linux.intel.com>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#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-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 <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <glib/gi18n-lib.h>
#include <dlfcn.h>
#include <GL/glx.h>
#include <X11/Xlib.h>
#define COGL_ONSCREEN_X11_EVENT_MASK StructureNotifyMask
#define MAX_GLX_CONFIG_ATTRIBS 30
typedef struct _CoglContextGLX
{
GLXDrawable current_drawable;
} CoglContextGLX;
typedef struct _CoglOnscreenXlib
{
Window xwin;
CoglBool is_foreign_xwin;
} CoglOnscreenXlib;
typedef struct _CoglOnscreenGLX
{
CoglOnscreenXlib _parent;
GLXDrawable glxwin;
uint32_t last_swap_vsync_counter;
CoglBool pending_swap_notify;
} CoglOnscreenGLX;
typedef struct _CoglTexturePixmapGLX
{
GLXPixmap glx_pixmap;
CoglBool has_mipmap_space;
CoglBool can_mipmap;
CoglTexture *glx_tex;
CoglBool bind_tex_image_queued;
CoglBool pixmap_bound;
} CoglTexturePixmapGLX;
/* Define a set of arrays containing the functions required from GL
for each winsys feature */
#define COGL_WINSYS_FEATURE_BEGIN(name, namespaces, extension_names, \
feature_flags, feature_flags_private, \
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, pf_ ## 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(name, namespaces, extension_names, \
feature_flags, feature_flags_private, \
winsys_feature) \
{ 255, 255, 0, namespaces, extension_names, \
feature_flags, feature_flags_private, \
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)
{
CoglGLXRenderer *glx_renderer = renderer->winsys;
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
notify_swap_buffers (CoglContext *context, GLXDrawable drawable)
{
CoglOnscreen *onscreen = find_onscreen_for_xid (context, (uint32_t)drawable);
CoglDisplay *display = context->display;
CoglGLXDisplay *glx_display = display->winsys;
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 */
glx_display->pending_swap_notify = TRUE;
glx_onscreen->pending_swap_notify = TRUE;
}
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)
{
CoglOnscreen *onscreen =
find_onscreen_for_xid (context, xevent->xconfigure.window);
if (onscreen)
{
CoglFramebuffer *framebuffer = COGL_FRAMEBUFFER (onscreen);
_cogl_framebuffer_winsys_update_size (framebuffer,
xevent->xconfigure.width,
xevent->xconfigure.height);
}
/* 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->drawable);
/* remove SwapComplete events from the queue */
return COGL_FILTER_REMOVE;
}
#endif /* GLX_INTEL_swap_event */
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
resolve_core_glx_functions (CoglRenderer *renderer,
GError **error)
{
CoglGLXRenderer *glx_renderer;
glx_renderer = renderer->winsys;
if (!g_module_symbol (glx_renderer->libgl_module, "glXCreatePixmap",
(void **) &glx_renderer->glXCreatePixmap) ||
!g_module_symbol (glx_renderer->libgl_module, "glXDestroyPixmap",
(void **) &glx_renderer->glXDestroyPixmap) ||
!g_module_symbol (glx_renderer->libgl_module, "glXChooseFBConfig",
(void **) &glx_renderer->glXChooseFBConfig) ||
!g_module_symbol (glx_renderer->libgl_module, "glXCreateNewContext",
(void **) &glx_renderer->glXCreateNewContext) ||
!g_module_symbol (glx_renderer->libgl_module, "glXGetFBConfigAttrib",
(void **) &glx_renderer->glXGetFBConfigAttrib) ||
!g_module_symbol (glx_renderer->libgl_module, "glXQueryVersion",
(void **) &glx_renderer->glXQueryVersion) ||
!g_module_symbol (glx_renderer->libgl_module, "glXDestroyContext",
(void **) &glx_renderer->glXDestroyContext) ||
!g_module_symbol (glx_renderer->libgl_module, "glXMakeContextCurrent",
(void **) &glx_renderer->glXMakeContextCurrent) ||
!g_module_symbol (glx_renderer->libgl_module, "glXSwapBuffers",
(void **) &glx_renderer->glXSwapBuffers) ||
!g_module_symbol (glx_renderer->libgl_module, "glXQueryExtension",
(void **) &glx_renderer->glXQueryExtension) ||
!g_module_symbol (glx_renderer->libgl_module, "glXIsDirect",
(void **) &glx_renderer->glXIsDirect) ||
!g_module_symbol (glx_renderer->libgl_module, "glXGetVisualFromFBConfig",
(void **) &glx_renderer->glXGetVisualFromFBConfig) ||
!g_module_symbol (glx_renderer->libgl_module, "glXSelectEvent",
(void **) &glx_renderer->glXSelectEvent) ||
!g_module_symbol (glx_renderer->libgl_module, "glXCreateWindow",
(void **) &glx_renderer->glXCreateWindow) ||
!g_module_symbol (glx_renderer->libgl_module, "glXGetFBConfigs",
(void **) &glx_renderer->glXGetFBConfigs) ||
!g_module_symbol (glx_renderer->libgl_module, "glXDestroyWindow",
(void **) &glx_renderer->glXDestroyWindow) ||
!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_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_INIT,
"Failed to resolve required GLX symbol");
return FALSE;
}
return TRUE;
}
static CoglBool
_cogl_winsys_renderer_connect (CoglRenderer *renderer,
GError **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)
{
g_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)
{
g_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))
{
g_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))
{
g_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_INIT,
"XServer appears to lack required GLX 1.2 support");
goto error;
}
glx_renderer->dri_fd = -1;
return TRUE;
error:
_cogl_winsys_renderer_disconnect (renderer);
return FALSE;
}
static CoglBool
update_winsys_features (CoglContext *context, GError **error)
{
CoglGLXDisplay *glx_display = context->display->winsys;
CoglXlibRenderer *xlib_renderer =
_cogl_xlib_renderer_get_data (context->display->renderer);
CoglGLXRenderer *glx_renderer = context->display->renderer->winsys;
const char *glx_extensions;
int default_screen;
int i;
_COGL_RETURN_VAL_IF_FAIL (glx_display->glx_context, FALSE);
if (!_cogl_context_update_features (context, error))
return FALSE;
memset (context->winsys_features, 0, sizeof (context->winsys_features));
default_screen = DefaultScreen (xlib_renderer->xdpy);
glx_extensions =
glx_renderer->glXQueryExtensionsString (xlib_renderer->xdpy,
default_screen);
COGL_NOTE (WINSYS, " GLX Extensions: %s", glx_extensions);
context->feature_flags |= COGL_FEATURE_ONSCREEN_MULTIPLE;
COGL_FLAGS_SET (context->features,
COGL_FEATURE_ID_ONSCREEN_MULTIPLE, TRUE);
COGL_FLAGS_SET (context->winsys_features,
COGL_WINSYS_FEATURE_MULTIPLE_ONSCREEN,
TRUE);
for (i = 0; i < G_N_ELEMENTS (winsys_feature_data); i++)
if (_cogl_feature_check (context->display->renderer,
"GLX", winsys_feature_data + i, 0, 0,
COGL_DRIVER_GL, /* the driver isn't used */
glx_extensions,
glx_renderer))
{
context->feature_flags |= winsys_feature_data[i].feature_flags;
if (winsys_feature_data[i].winsys_feature)
COGL_FLAGS_SET (context->winsys_features,
winsys_feature_data[i].winsys_feature,
TRUE);
}
/* Note: the GLX_SGI_video_sync spec explicitly states this extension
* only works for direct contexts. */
if (!glx_renderer->is_direct)
{
glx_renderer->pf_glXGetVideoSync = NULL;
glx_renderer->pf_glXWaitVideoSync = NULL;
}
if (glx_renderer->pf_glXWaitVideoSync)
COGL_FLAGS_SET (context->winsys_features,
COGL_WINSYS_FEATURE_VBLANK_WAIT,
TRUE);
if (glx_renderer->pf_glXCopySubBuffer || context->glBlitFramebuffer)
{
CoglGpuInfoArchitecture arch;
/* XXX: ONGOING BUG:
* (Don't change the line above since we use this to grep for
* un-resolved bug workarounds as part of the release process.)
*
* "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
*/
arch = context->gpu.architecture;
if (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, TRUE);
}
}
/* 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_SWAP_BUFFERS_EVENT))
COGL_FLAGS_SET (context->features,
COGL_FEATURE_ID_SWAP_BUFFERS_EVENT,
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 (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,
GError **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)
{
g_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;
}
}
g_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 CoglBool
create_context (CoglDisplay *display, GError **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;
GError *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)
{
g_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_CREATE_CONTEXT,
"Unable to find suitable fbconfig for the GLX context: %s",
fbconfig_error->message);
g_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);
glx_display->glx_context =
glx_renderer->glXCreateNewContext (xlib_renderer->xdpy,
config,
GLX_RGBA_TYPE,
NULL,
True);
if (glx_display->glx_context == NULL)
{
g_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)
{
g_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))
{
g_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,
GError **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, GError **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,
GError **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;
GError *fbconfig_error = NULL;
_COGL_RETURN_VAL_IF_FAIL (glx_display->glx_context, FALSE);
if (!find_fbconfig (display, &framebuffer->config,
&fbconfig,
&fbconfig_error))
{
g_set_error (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_CREATE_CONTEXT,
"Unable to find suitable fbconfig for the GLX context: %s",
fbconfig_error->message);
g_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));
g_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)
{
g_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));
g_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_SWAP_BUFFERS_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;
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;
/* If we never successfully allocated then there's nothing to do */
if (glx_onscreen == NULL)
return;
_cogl_xlib_renderer_trap_errors (context->display->renderer, &old_state);
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->pf_glXSwapInterval)
{
CoglFramebuffer *fb = COGL_FRAMEBUFFER (onscreen);
if (fb->config.swap_throttled)
glx_renderer->pf_glXSwapInterval (1);
else
glx_renderer->pf_glXSwapInterval (0);
}
XSync (xlib_renderer->xdpy, False);
/* FIXME: We should be reporting a GError 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_vblank (void)
{
CoglGLXRenderer *glx_renderer;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
glx_renderer = ctx->display->renderer->winsys;
if (glx_renderer->pf_glXGetVideoSync)
{
uint32_t current_count;
glx_renderer->pf_glXGetVideoSync (&current_count);
glx_renderer->pf_glXWaitVideoSync (2,
(current_count + 1) % 2,
&current_count);
}
}
static uint32_t
_cogl_winsys_get_vsync_counter (void)
{
uint32_t video_sync_count;
CoglGLXRenderer *glx_renderer;
_COGL_GET_CONTEXT (ctx, 0);
glx_renderer = ctx->display->renderer->winsys;
glx_renderer->pf_glXGetVideoSync (&video_sync_count);
return video_sync_count;
}
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;
/*
* 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_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];
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.
*/
context->glFinish ();
if (blit_sub_buffer_is_synchronized && have_counter && can_wait)
{
end_frame_vsync_counter = _cogl_winsys_get_vsync_counter ();
/* 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 ();
}
else if (can_wait)
_cogl_winsys_wait_for_vblank ();
if (glx_renderer->pf_glXCopySubBuffer)
{
Display *xdpy = xlib_renderer->xdpy;
int i;
for (i = 0; i < n_rectangles; i++)
{
int *rect = &rectangles[4 * i];
glx_renderer->pf_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 */
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 (GL_BACK);
}
/* 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;
}
static void
_cogl_winsys_onscreen_swap_buffers (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;
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 ();
if (!glx_renderer->pf_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
*/
context->glFinish ();
if (have_counter && can_wait)
{
if (glx_onscreen->last_swap_vsync_counter ==
end_frame_vsync_counter)
_cogl_winsys_wait_for_vblank ();
}
else if (can_wait)
_cogl_winsys_wait_for_vblank ();
}
}
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 ();
}
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);
}
/* 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,
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 */
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)
{
*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;
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, &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;
/* FIXME: It should be possible to get to a CoglContext from any
* CoglTexture pointer. */
_COGL_GET_CONTEXT (ctx, FALSE);
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->glx_tex = NULL;
glx_tex_pixmap->bind_tex_image_queued = TRUE;
glx_tex_pixmap->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->pixmap_bound)
glx_renderer->pf_glXReleaseTexImage (xlib_renderer->xdpy,
glx_tex_pixmap->glx_pixmap,
GLX_FRONT_LEFT_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->pixmap_bound = FALSE;
}
static void
_cogl_winsys_texture_pixmap_x11_free (CoglTexturePixmapX11 *tex_pixmap)
{
CoglTexturePixmapGLX *glx_tex_pixmap;
/* FIXME: It should be possible to get to a CoglContext from any
* CoglTexture pointer. */
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
if (!tex_pixmap->winsys)
return;
glx_tex_pixmap = tex_pixmap->winsys;
free_glx_pixmap (ctx, glx_tex_pixmap);
if (glx_tex_pixmap->glx_tex)
cogl_object_unref (glx_tex_pixmap->glx_tex);
tex_pixmap->winsys = NULL;
g_free (glx_tex_pixmap);
}
static CoglBool
_cogl_winsys_texture_pixmap_x11_update (CoglTexturePixmapX11 *tex_pixmap,
CoglBool needs_mipmap)
{
CoglTexturePixmapGLX *glx_tex_pixmap = tex_pixmap->winsys;
CoglGLXRenderer *glx_renderer;
/* FIXME: It should be possible to get to a CoglContext from any CoglTexture
* pointer. */
_COGL_GET_CONTEXT (ctx, FALSE);
/* 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 (glx_tex_pixmap->glx_tex == NULL)
{
CoglPixelFormat texture_format;
GError *error = NULL;
texture_format = (tex_pixmap->depth >= 32 ?
COGL_PIXEL_FORMAT_RGBA_8888_PRE :
COGL_PIXEL_FORMAT_RGB_888);
if (should_use_rectangle (ctx))
{
glx_tex_pixmap->glx_tex = COGL_TEXTURE (
cogl_texture_rectangle_new_with_size (ctx,
tex_pixmap->width,
tex_pixmap->height,
texture_format,
&error));
if (glx_tex_pixmap->glx_tex)
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);
g_error_free (error);
free_glx_pixmap (ctx, glx_tex_pixmap);
return FALSE;
}
}
else
{
glx_tex_pixmap->glx_tex = COGL_TEXTURE (
cogl_texture_2d_new_with_size (ctx,
tex_pixmap->width,
tex_pixmap->height,
texture_format,
NULL));
if (glx_tex_pixmap->glx_tex)
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",
tex_pixmap);
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 (glx_tex_pixmap->glx_tex)
cogl_object_unref (glx_tex_pixmap->glx_tex);
return FALSE;
}
glx_tex_pixmap->bind_tex_image_queued = TRUE;
}
}
if (glx_tex_pixmap->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 (glx_tex_pixmap->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 (glx_tex_pixmap->pixmap_bound)
glx_renderer->pf_glXReleaseTexImage (xlib_renderer->xdpy,
glx_tex_pixmap->glx_pixmap,
GLX_FRONT_LEFT_EXT);
glx_renderer->pf_glXBindTexImage (xlib_renderer->xdpy,
glx_tex_pixmap->glx_pixmap,
GLX_FRONT_LEFT_EXT,
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 */
glx_tex_pixmap->bind_tex_image_queued = FALSE;
glx_tex_pixmap->pixmap_bound = TRUE;
_cogl_texture_2d_externally_modified (glx_tex_pixmap->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->bind_tex_image_queued = TRUE;
}
static CoglTexture *
_cogl_winsys_texture_pixmap_x11_get_texture (CoglTexturePixmapX11 *tex_pixmap)
{
CoglTexturePixmapGLX *glx_tex_pixmap = tex_pixmap->winsys;
return glx_tex_pixmap->glx_tex;
}
static void
_cogl_winsys_poll_get_info (CoglContext *context,
CoglPollFD **poll_fds,
int *n_poll_fds,
int64_t *timeout)
{
CoglDisplay *display = context->display;
CoglGLXDisplay *glx_display = display->winsys;
_cogl_xlib_renderer_poll_get_info (context->display->renderer,
poll_fds,
n_poll_fds,
timeout);
/* If we've already got a pending swap notify then we'll dispatch
immediately */
if (glx_display->pending_swap_notify)
*timeout = 0;
}
static void
flush_pending_swap_notify_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;
if (glx_onscreen->pending_swap_notify)
{
_cogl_onscreen_notify_swap_buffers (onscreen);
glx_onscreen->pending_swap_notify = FALSE;
}
}
}
static void
_cogl_winsys_poll_dispatch (CoglContext *context,
const CoglPollFD *poll_fds,
int n_poll_fds)
{
CoglDisplay *display = context->display;
CoglGLXDisplay *glx_display = display->winsys;
_cogl_xlib_renderer_poll_dispatch (context->display->renderer,
poll_fds,
n_poll_fds);
if (glx_display->pending_swap_notify)
{
g_list_foreach (context->framebuffers,
flush_pending_swap_notify_cb,
NULL);
glx_display->pending_swap_notify = FALSE;
}
}
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,
.display_setup = _cogl_winsys_display_setup,
.display_destroy = _cogl_winsys_display_destroy,
.context_init = _cogl_winsys_context_init,
.context_deinit = _cogl_winsys_context_deinit,
.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 = _cogl_winsys_onscreen_swap_buffers,
.onscreen_swap_region = _cogl_winsys_onscreen_swap_region,
.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,
.poll_get_info = _cogl_winsys_poll_get_info,
.poll_dispatch = _cogl_winsys_poll_dispatch,
/* 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;
}
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