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x11: Create legacy GLX contexts

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If GLX has support for the GLX_ARB_create_context_profile extension,
then we use the GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB; if it does
not, we fall back to the old glXCreateNewContext() API.

We use the shared GdkGLContext to decide whether the GLX context should
use the legacy bit or not.

https://bugzilla.gnome.org/show_bug.cgi?id=756142
This commit is contained in:
Emmanuele Bassi 2015-10-06 18:59:35 +01:00
parent e636c316a6
commit 18cae47e17
1 changed files with 83 additions and 17 deletions
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100
gdk/x11/gdkglcontext-x11.c
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@ -554,12 +554,13 @@ static GLXContext
create_gl3_context (GdkDisplay *display,
GLXFBConfig config,
GdkGLContext *share,
int profile,
int flags,
int major,
int minor)
{
int attrib_list[] = {
GLX_CONTEXT_PROFILE_MASK_ARB, GLX_CONTEXT_CORE_PROFILE_BIT_ARB,
GLX_CONTEXT_PROFILE_MASK_ARB, profile,
GLX_CONTEXT_MAJOR_VERSION_ARB, major,
GLX_CONTEXT_MINOR_VERSION_ARB, minor,
GLX_CONTEXT_FLAGS_ARB, flags,
@ -586,6 +587,31 @@ create_gl3_context (GdkDisplay *display,
return res;
}
static GLXContext
create_legacy_context (GdkDisplay *display,
GLXFBConfig config,
GdkGLContext *share)
{
GdkX11GLContext *share_x11 = NULL;
GLXContext res;
if (share != NULL)
share_x11 = GDK_X11_GL_CONTEXT (share);
gdk_x11_display_error_trap_push (display);
res = glXCreateNewContext (gdk_x11_display_get_xdisplay (display),
config,
GLX_RGBA_TYPE,
share_x11 != NULL ? share_x11->glx_context : NULL,
TRUE);
if (gdk_x11_display_error_trap_pop (display))
return NULL;
return res;
}
static gboolean
gdk_x11_gl_context_realize (GdkGLContext *context,
GError **error)
@ -598,7 +624,7 @@ gdk_x11_gl_context_realize (GdkGLContext *context,
DrawableInfo *info;
GdkGLContext *share;
GdkWindow *window;
gboolean debug_bit, compat_bit;
gboolean debug_bit, compat_bit, legacy_bit;
int major, minor, flags;
window = gdk_gl_context_get_window (context);
@ -611,6 +637,16 @@ gdk_x11_gl_context_realize (GdkGLContext *context,
debug_bit = gdk_gl_context_get_debug_enabled (context);
compat_bit = gdk_gl_context_get_forward_compatible (context);
/* If there is no glXCreateContextAttribsARB() then we default to legacy */
legacy_bit = !GDK_X11_DISPLAY (display)->has_glx_create_context;
/* We cannot share legacy contexts with core profile ones, so the
* shared context is the one that decides if we're going to create
* a legacy context or not.
*/
if (share != NULL && gdk_gl_context_is_legacy (share))
legacy_bit = TRUE;
flags = 0;
if (debug_bit)
flags |= GLX_CONTEXT_DEBUG_BIT_ARB;
@ -618,15 +654,51 @@ gdk_x11_gl_context_realize (GdkGLContext *context,
flags |= GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB;
GDK_NOTE (OPENGL,
g_print ("Creating core GLX context (version:%d.%d, debug:%s, forward:%s)\n",
g_print ("Creating core GLX context (version:%d.%d, debug:%s, forward:%s, legacy:%s)\n",
major, minor,
debug_bit ? "yes" : "no",
compat_bit ? "yes" : "no"));
compat_bit ? "yes" : "no",
legacy_bit ? "yes" : "no"));
/* If we have access to GLX_ARB_create_context_profile then we can ask for
* a compatibility profile; if we don't, then we have to fall back to the
* old GLX 1.3 API.
*/
if (legacy_bit && !GDK_X11_DISPLAY (display)->has_glx_create_context)
{
GDK_NOTE (OPENGL, g_print ("Creating legacy GL context on request\n"));
context_x11->glx_context = create_legacy_context (display, context_x11->glx_config, share);
}
else
{
int profile = legacy_bit ? GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB
: GLX_CONTEXT_CORE_PROFILE_BIT_ARB;
/* We need to tweak the version, otherwise we may end up requesting
* a compatibility context with a minimum version of 3.2, which is
* an error
*/
if (legacy_bit)
{
major = 3;
minor = 0;
}
GDK_NOTE (OPENGL, g_print ("Creating GL3 context\n"));
context_x11->glx_context = create_gl3_context (display,
context_x11->glx_config,
share,
profile, flags, major, minor);
/* Fall back to legacy in case the GL3 context creation failed */
if (context_x11->glx_context == NULL)
{
GDK_NOTE (OPENGL, g_print ("Creating fallback legacy context\n"));
context_x11->glx_context = create_legacy_context (display, context_x11->glx_config, share);
legacy_bit = TRUE;
}
}
context_x11->glx_context = create_gl3_context (display,
context_x11->glx_config,
share,
flags, major, minor);
if (context_x11->glx_context == NULL)
{
g_set_error_literal (error, GDK_GL_ERROR,
@ -635,6 +707,9 @@ gdk_x11_gl_context_realize (GdkGLContext *context,
return FALSE;
}
/* Ensure that any other context is created with a legacy bit set */
gdk_gl_context_set_is_legacy (context, legacy_bit);
xvisinfo = find_xvisinfo_for_fbconfig (display, context_x11->glx_config);
info = get_glx_drawable_info (window->impl_window);
@ -1179,15 +1254,6 @@ gdk_x11_window_create_gl_context (GdkWindow *window,
return NULL;
}
if (!GDK_X11_DISPLAY (display)->has_glx_create_context)
{
g_set_error_literal (error, GDK_GL_ERROR,
GDK_GL_ERROR_UNSUPPORTED_PROFILE,
_("The GLX_ARB_create_context_profile extension "
"needed to create core profiles is not available"));
return NULL;
}
visual = gdk_window_get_visual (window);
if (!find_fbconfig_for_visual (display, visual, &config, error))
return NULL;