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[picking] Use cogl_clip_push_window_rect to greatly reduce the cost of picking.

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cogl_clip_push_window_rect is implemented using GPU scissoring which allows
the GPU to cull anything that falls outside a given rectangle.  Since in the
case of picking we only ever care about a single pixel we can get the GPU to
ignore all geometry that doesn't intersect that pixel and only rasterize for
one pixel.
This commit is contained in:
Robert Bragg 2009-05-12 01:02:25 +01:00
parent e80fcbc298
commit d1fa83039d
1 changed files with 2 additions and 0 deletions
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2
clutter/clutter-main.c
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@ -370,6 +370,7 @@ _clutter_do_pick (ClutterStage *stage,
/* needed for when a context switch happens */ /* needed for when a context switch happens */
_clutter_stage_maybe_setup_viewport (stage); _clutter_stage_maybe_setup_viewport (stage);
cogl_clip_push_window_rect (x, y, 1, 1);
cogl_color_set_from_4ub (&white, 255, 255, 255, 255); cogl_color_set_from_4ub (&white, 255, 255, 255, 255);
cogl_disable_fog (); cogl_disable_fog ();
cogl_clear (&white, cogl_clear (&white,
@ -387,6 +388,7 @@ _clutter_do_pick (ClutterStage *stage,
context->pick_mode = mode; context->pick_mode = mode;
clutter_actor_paint (CLUTTER_ACTOR (stage)); clutter_actor_paint (CLUTTER_ACTOR (stage));
context->pick_mode = CLUTTER_PICK_NONE; context->pick_mode = CLUTTER_PICK_NONE;
cogl_clip_pop ();
/* Calls should work under both GL and GLES, note GLES needs RGBA */ /* Calls should work under both GL and GLES, note GLES needs RGBA */
glGetIntegerv(GL_VIEWPORT, viewport); glGetIntegerv(GL_VIEWPORT, viewport);