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mutter/cogl/cogl/winsys/cogl-winsys-glx.c
Jonas Ådahl b2579750a7 cogl: Remove legacy OpenGL driver support 
This means the two Cogl drivers left are OpenGL >= 3.1 and GLES >= 2.0.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2672>
2023-02-21 18:09:28 +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>
*/
#include "cogl-config.h"
#include "cogl-i18n-private.h"
#include "cogl-util.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-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-poll-private.h"
#include "cogl-glx.h"
#include "driver/gl/cogl-pipeline-opengl-private.h"
#include "winsys/cogl-onscreen-glx.h"
#include "winsys/cogl-winsys-private.h"
#include "winsys/cogl-winsys-glx-private.h"
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <errno.h>
#include <fcntl.h>
#include <time.h>
#include <unistd.h>
#include <GL/glx.h>
#include <X11/Xlib.h>
#include <glib.h>
/* This is a relatively new extension */
#ifndef GLX_GENERATE_RESET_ON_VIDEO_MEMORY_PURGE_NV
#define GLX_GENERATE_RESET_ON_VIDEO_MEMORY_PURGE_NV 0x20F7
#endif
#define MAX_GLX_CONFIG_ATTRIBS 30
typedef struct _CoglOnscreenGlx CoglOnscreenGlx;
typedef struct _CoglContextGLX
{
GLXDrawable current_drawable;
} CoglContextGLX;
typedef struct _CoglPixmapTextureEyeGLX
{
CoglTexture *glx_tex;
gboolean bind_tex_image_queued;
gboolean pixmap_bound;
} CoglPixmapTextureEyeGLX;
typedef struct _CoglTexturePixmapGLX
{
GLXPixmap glx_pixmap;
gboolean has_mipmap_space;
gboolean 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 "winsys/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, \
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 "winsys/cogl-winsys-glx-feature-functions.h"
};
static GCallback
_cogl_winsys_renderer_get_proc_address (CoglRenderer *renderer,
const char *name,
gboolean 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;
CoglOnscreen *onscreen;
if (!COGL_IS_ONSCREEN (framebuffer))
continue;
onscreen = COGL_ONSCREEN (framebuffer);
if (cogl_onscreen_glx_is_for_window (onscreen, (Window) xid))
return onscreen;
}
return NULL;
}
static void
notify_swap_buffers (CoglContext *context, GLXBufferSwapComplete *swap_event)
{
CoglOnscreen *onscreen = find_onscreen_for_xid (context, (uint32_t)swap_event->drawable);
if (!onscreen)
return;
cogl_onscreen_glx_notify_swap_buffers (onscreen, swap_event);
}
static void
notify_resize (CoglContext *context,
XConfigureEvent *configure_event)
{
CoglOnscreen *onscreen;
onscreen = find_onscreen_for_xid (context, configure_event->window);
if (!onscreen)
return;
cogl_onscreen_glx_resize (onscreen, configure_event);
}
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_free (renderer->winsys);
}
static gboolean
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 (!COGL_IS_ONSCREEN (framebuffer))
continue;
cogl_onscreen_glx_update_output (COGL_ONSCREEN (framebuffer));
}
return TRUE;
}
static void
_cogl_winsys_renderer_outputs_changed (CoglRenderer *renderer)
{
update_all_outputs (renderer);
}
static void
_cogl_winsys_renderer_bind_api (CoglRenderer *renderer)
{
}
static gboolean
resolve_core_glx_functions (CoglRenderer *renderer,
GError **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))
{
g_set_error_literal (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_GL3, /* the driver isn't used */
split_extensions,
glx_renderer))
{
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);
/* The GLX_SGI_video_sync spec explicitly states this extension
* only works for direct contexts; we don't know per-renderer
* if the context is direct or not, so we turn off the feature
* flag; we still use the extension within this file looking
* instead at glx_display->have_vblank_counter.
*/
COGL_FLAGS_SET (glx_renderer->base_winsys_features,
COGL_WINSYS_FEATURE_VBLANK_COUNTER,
FALSE);
/* Because of the direct-context dependency, the VBLANK_WAIT feature
* doesn't reflect the presence of GLX_SGI_video_sync.
*/
if (glx_renderer->glXWaitForMsc)
COGL_FLAGS_SET (glx_renderer->base_winsys_features,
COGL_WINSYS_FEATURE_VBLANK_WAIT,
TRUE);
}
static gboolean
_cogl_winsys_renderer_connect (CoglRenderer *renderer,
GError **error)
{
CoglGLXRenderer *glx_renderer;
CoglXlibRenderer *xlib_renderer;
renderer->winsys = g_new0 (CoglGLXRenderer, 1);
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_GL3)
{
g_set_error_literal (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_literal (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_literal (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_literal (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 gboolean
update_winsys_features (CoglContext *context, GError **error)
{
CoglGLXDisplay *glx_display = context->display->winsys;
CoglGLXRenderer *glx_renderer = context->display->renderer->winsys;
g_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));
if (glx_renderer->glXCopySubBuffer || context->glBlitFramebuffer)
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) &&
(glx_display->have_vblank_counter || glx_display->can_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);
}
/* 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,
const 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++] = GLX_DONT_CARE;
attributes[i++] = GLX_DEPTH_SIZE;
attributes[i++] = 1;
attributes[i++] = GLX_STENCIL_SIZE;
attributes[i++] = config->need_stencil ? 2 : 0;
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. */
gboolean
cogl_display_glx_find_fbconfig (CoglDisplay *display,
const 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];
gboolean 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_literal (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_CREATE_CONTEXT,
"Failed to find any compatible fbconfigs");
ret = FALSE;
goto done;
}
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
};
/* NV_robustness_video_memory_purge relies on GLX_ARB_create_context
and in part on ARB_robustness. Namely, it needs the notification
strategy to be set to GLX_LOSE_CONTEXT_ON_RESET_ARB and that the
driver exposes the GetGraphicsResetStatusARB function. This means
we don't actually enable robust buffer access. */
static const int attrib_list_reset_on_purge[] =
{
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,
GLX_GENERATE_RESET_ON_VIDEO_MEMORY_PURGE_NV,
GL_TRUE,
GLX_CONTEXT_RESET_NOTIFICATION_STRATEGY_ARB,
GLX_LOSE_CONTEXT_ON_RESET_ARB,
None
};
/* Make sure that the display supports the GLX_ARB_create_context
extension */
if (glx_renderer->glXCreateContextAttribs == NULL)
return NULL;
/* We can't check the presence of this extension with the usual
COGL_WINSYS_FEATURE machinery because that only gets initialized
later when the CoglContext is created. */
if (display->renderer->xlib_want_reset_on_video_memory_purge &&
strstr (glx_renderer->glXQueryExtensionsString (xlib_renderer->xdpy,
DefaultScreen (xlib_renderer->xdpy)),
"GLX_NV_robustness_video_memory_purge"))
{
CoglXlibTrapState old_state;
GLXContext ctx;
_cogl_xlib_renderer_trap_errors (display->renderer, &old_state);
ctx = glx_renderer->glXCreateContextAttribs (xlib_renderer->xdpy,
fb_config,
NULL /* share_context */,
True, /* direct */
attrib_list_reset_on_purge);
if (!_cogl_xlib_renderer_untrap_errors (display->renderer, &old_state) && ctx)
return ctx;
}
return glx_renderer->glXCreateContextAttribs (xlib_renderer->xdpy,
fb_config,
NULL /* share_context */,
True, /* direct */
attrib_list);
}
static gboolean
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;
GLXFBConfig config;
GError *fbconfig_error = NULL;
XSetWindowAttributes attrs;
XVisualInfo *xvisinfo;
GLXDrawable dummy_drawable;
CoglXlibTrapState old_state;
g_return_val_if_fail (glx_display->glx_context == NULL, TRUE);
glx_display->found_fbconfig =
cogl_display_glx_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;
COGL_NOTE (WINSYS, "Creating GLX Context (display: %p)",
xlib_renderer->xdpy);
_cogl_xlib_renderer_trap_errors (display->renderer, &old_state);
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 (_cogl_xlib_renderer_untrap_errors (display->renderer, &old_state) ||
glx_display->glx_context == NULL)
{
g_set_error_literal (error, COGL_WINSYS_ERROR,
COGL_WINSYS_ERROR_CREATE_CONTEXT,
"Unable to create suitable GL context");
return FALSE;
}
glx_display->is_direct =
glx_renderer->glXIsDirect (xlib_renderer->xdpy, glx_display->glx_context);
glx_display->have_vblank_counter = glx_display->is_direct && glx_renderer->glXWaitVideoSync;
glx_display->can_vblank_wait = glx_renderer->glXWaitForMsc || glx_display->have_vblank_counter;
COGL_NOTE (WINSYS, "Setting %s context",
glx_display->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_literal (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);
xlib_renderer->xvisinfo = xvisinfo;
if (_cogl_xlib_renderer_untrap_errors (display->renderer, &old_state))
{
g_set_error_literal (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;
g_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_free (display->winsys);
display->winsys = NULL;
}
static gboolean
_cogl_winsys_display_setup (CoglDisplay *display,
GError **error)
{
CoglGLXDisplay *glx_display;
int i;
g_return_val_if_fail (display->winsys == NULL, FALSE);
glx_display = g_new0 (CoglGLXDisplay, 1);
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 gboolean
_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 gboolean
get_fbconfig_for_depth (CoglContext *context,
unsigned int depth,
gboolean stereo,
GLXFBConfig *fbconfig_ret,
gboolean *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;
gboolean 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;
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 gboolean
try_create_glx_pixmap (CoglContext *context,
CoglTexturePixmapX11 *tex_pixmap,
gboolean 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;
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 (!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++] = GLX_TEXTURE_2D_EXT;
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 gboolean
_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 gboolean
_cogl_winsys_texture_pixmap_x11_update (CoglTexturePixmapX11 *tex_pixmap,
CoglTexturePixmapStereoMode stereo_mode,
gboolean 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;
GError *error = NULL;
texture_format = (tex_pixmap->depth >= 32 ?
COGL_PIXEL_FORMAT_RGBA_8888_PRE :
COGL_PIXEL_FORMAT_RGB_888);
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);
g_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);
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;
}
void
cogl_context_glx_set_current_drawable (CoglContext *context,
GLXDrawable drawable)
{
CoglContextGLX *glx_context = context->winsys;
glx_context->current_drawable = drawable;
}
GLXDrawable
cogl_context_glx_get_current_drawable (CoglContext *context)
{
CoglContextGLX *glx_context = context->winsys;
return glx_context->current_drawable;
}
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,
.renderer_bind_api = _cogl_winsys_renderer_bind_api,
.display_setup = _cogl_winsys_display_setup,
.display_destroy = _cogl_winsys_display_destroy,
.context_init = _cogl_winsys_context_init,
.context_deinit = _cogl_winsys_context_deinit,
/* 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.
*/
COGL_EXPORT const CoglWinsysVtable *
_cogl_winsys_glx_get_vtable (void)
{
return &_cogl_winsys_vtable;
}
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