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pick: Use Cogl API not GL API to disable dithering

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When picking we need to disable dithering to be sure that the hardware
will not modify the colors we use as actor identifiers. Clutter was
manually calling glEnable/Disable GL_DITHER to handle this, but that was
a layering violation since Cogl is intended to handle all interactions
with OpenGL. Since we are now striving for GL vs GLES to be a runtime
choice we need to remove this last direct usage of GL from Clutter so it
doesn't have to be linked with GL at build time.

Signed-off-by: Neil Roberts <neil@linux.intel.com>
This commit is contained in:
Robert Bragg 2011-07-12 17:04:15 +01:00
parent 3183240fef
commit c6a0427c69
1 changed files with 6 additions and 6 deletions
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12
clutter/clutter-stage.c
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@ -1261,7 +1261,8 @@ _clutter_stage_do_pick (ClutterStage *stage,
guchar pixel[4] = { 0xff, 0xff, 0xff, 0xff };
CoglColor stage_pick_id;
guint32 id_;
GLboolean dither_was_on;
gboolean dither_enabled_save;
CoglFramebuffer *fb;
ClutterActor *actor;
gboolean is_clipped;
CLUTTER_STATIC_COUNTER (do_pick_counter,
@ -1369,9 +1370,9 @@ _clutter_stage_do_pick (ClutterStage *stage,
CLUTTER_TIMER_STOP (_clutter_uprof_context, pick_clear);
/* Disable dithering (if any) when doing the painting in pick mode */
dither_was_on = glIsEnabled (GL_DITHER);
if (dither_was_on)
glDisable (GL_DITHER);
fb = cogl_get_draw_framebuffer ();
dither_enabled_save = cogl_framebuffer_get_dither_enabled (fb);
cogl_framebuffer_set_dither_enabled (fb, FALSE);
/* Render the entire scence in pick mode - just single colored silhouette's
* are drawn offscreen (as we never swap buffers)
@ -1422,8 +1423,7 @@ _clutter_stage_do_pick (ClutterStage *stage,
}
/* Restore whether GL_DITHER was enabled */
if (dither_was_on)
glEnable (GL_DITHER);
cogl_framebuffer_set_dither_enabled (fb, dither_enabled_save);
if (pixel[0] == 0xff && pixel[1] == 0xff && pixel[2] == 0xff)
{