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Expose COGL_FEATURE_ID_BUFFER_AGE feature id

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This adds a new COGL_FEATURE_ID_BUFFER_AGE feature id that can be used
to determine if cogl_onscreen_get_buffer_age() will ever return an age
other than 0. This should be used instead of querying the winsys feature
via cogl_clutter_winsys_has_feature().

Reviewed-by: Neil Roberts <neil@linux.intel.com>
This commit is contained in:
Robert Bragg 2014-03-14 15:06:39 +00:00
parent beebbfc625
commit ad9db72f74
4 changed files with 18 additions and 3 deletions
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4
cogl/cogl-context.h
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@ -234,6 +234,9 @@ cogl_is_context (void *object);
* @COGL_FEATURE_ID_SWAP_BUFFERS_EVENT:
* Available if the window system supports reporting an event
* for swap buffer completions.
* @COGL_FEATURE_ID_BUFFER_AGE: Available if the age of #CoglOnscreen back
* buffers are tracked and so cogl_onscreen_get_buffer_age() can be
* expected to return age values other than 0.
* @COGL_FEATURE_ID_GLES2_CONTEXT: Whether creating new GLES2 contexts is
* suported.
* @COGL_FEATURE_ID_DEPTH_TEXTURE: Whether #CoglFramebuffer support rendering
@ -273,6 +276,7 @@ typedef enum _CoglFeatureID
COGL_FEATURE_ID_FENCE,
COGL_FEATURE_ID_PER_VERTEX_POINT_SIZE,
COGL_FEATURE_ID_TEXTURE_RG,
COGL_FEATURE_ID_BUFFER_AGE,
/*< private >*/
_COGL_N_FEATURE_IDS /*< skip >*/

5
cogl/cogl-onscreen.h
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@ -390,6 +390,11 @@ cogl_onscreen_swap_buffers (CoglOnscreen *onscreen);
* of back buffers then this function will always return 0 which
* implies that the contents are undefined.</note>
*
* <note>The %COGL_FEATURE_ID_BUFFER_AGE feature can optionally be
* explicitly checked to determine if Cogl is currently tracking the
* age of #CoglOnscreen back buffer contents. If this feature is
* missing then this function will always return 0.</note>
*
* Return value: The age of the buffer contents or 0 when the buffer
* contents are undefined.
*

3
cogl/winsys/cogl-winsys-egl.c
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@ -515,9 +515,12 @@ _cogl_winsys_context_init (CoglContext *context, CoglError **error)
COGL_FLAGS_SET (context->features, COGL_FEATURE_ID_FENCE, TRUE);
if (egl_renderer->private_features & COGL_EGL_WINSYS_FEATURE_BUFFER_AGE)
{
COGL_FLAGS_SET (context->winsys_features,
COGL_WINSYS_FEATURE_BUFFER_AGE,
TRUE);
COGL_FLAGS_SET (context->features, COGL_FEATURE_ID_BUFFER_AGE, TRUE);
}
/* NB: We currently only support creating standalone GLES2 contexts
* for offscreen rendering and so we need a dummy (non-visible)

3
cogl/winsys/cogl-winsys-glx.c
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@ -873,6 +873,9 @@ update_winsys_features (CoglContext *context, CoglError **error)
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;
}