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gdk: Allow querying if a GL context is in legacy mode

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We want to have the ability to fall back to legacy GL contexts when
creating them. In order to do so, we need to store the legacy bit on the
GdkGLContext, as well as being able to query it.

Setting the legacy bit from outside GDK is not possible; we cannot
create GL contexts in 3.2 core profile *and* compatibility modes at the
same time, and if we allowed users to select the legacy mode themselves,
it would break the creation of the GdkWindow's paint GL context.

What we do allow is falling back to legacy GL context if the platform
does not support 3.2 core profiles — for instance, on older GPUs or
inside virtualized environments.

We are also going to use the legacy bit internally, to choose which GL
API we can use when drawing GL content.

https://bugzilla.gnome.org/show_bug.cgi?id=756142
This commit is contained in:
Emmanuele Bassi 2015-10-06 18:54:58 +01:00
parent b23eabbd64
commit 2dfca143bb
3 changed files with 38 additions and 0 deletions
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33
gdk/gdkglcontext.c
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@ -103,6 +103,7 @@ typedef struct {
guint extensions_checked : 1;
guint debug_enabled : 1;
guint forward_compatible : 1;
guint is_legacy : 1;
GdkGLContextPaintData *paint_data;
} GdkGLContextPrivate;
@ -554,6 +555,38 @@ gdk_gl_context_get_required_version (GdkGLContext *context,
*minor = min;
}
/**
* gdk_gl_context_is_legacy:
* @context: a #GdkGLContext
*
* Whether the #GdkGLContext is in legacy mode or not.
*
* The #GdkGLContext must be realized.
*
* Returns: %TRUE if the GL context is in legacy mode
*
* Since: 3.20
*/
gboolean
gdk_gl_context_is_legacy (GdkGLContext *context)
{
GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
g_return_val_if_fail (GDK_IS_GL_CONTEXT (context), FALSE);
g_return_val_if_fail (priv->realized, FALSE);
return priv->is_legacy;
}
void
gdk_gl_context_set_is_legacy (GdkGLContext *context,
gboolean is_legacy)
{
GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
priv->is_legacy = !!is_legacy;
}
/**
* gdk_gl_context_realize:
* @context: a #GdkGLContext

2
gdk/gdkglcontext.h
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@ -52,6 +52,8 @@ GDK_AVAILABLE_IN_3_16
void gdk_gl_context_get_version (GdkGLContext *context,
int *major,
int *minor);
GDK_AVAILABLE_IN_3_20
gboolean gdk_gl_context_is_legacy (GdkGLContext *context);
GDK_AVAILABLE_IN_3_16
void gdk_gl_context_set_required_version (GdkGLContext *context,

3
gdk/gdkglcontextprivate.h
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@ -69,6 +69,9 @@ typedef struct {
GdkGLContextProgram *current_program;
} GdkGLContextPaintData;
void gdk_gl_context_set_is_legacy (GdkGLContext *context,
gboolean is_legacy);
void gdk_gl_context_upload_texture (GdkGLContext *context,
cairo_surface_t *image_surface,
int width,