brl/mutter
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Make backface culling be part of the legacy state

Browse Source 
This adds an internal function to set the backface culling state on a
pipeline. This includes properties to set the culling mode (front,
back or both) and also to set which face is considered the front
(COGL_WINDING_CLOCKWISE or COGL_WINDING_COUNTER_CLOCKWISE). The actual
front face flushed to GL depends on whether we are rendering to an
offscreen buffer or not. This means that when changing between on- and
off- screen framebuffers it now checks whether the last flushed
pipeline has backface culling enabled and forces a reflush of the cull
face state if so.

The backface culling is now set on a pipeline as part of the legacy
state. This is important because some code in Cogl assumes it can
flush a temporary pipeline to revert to a known state, but previously
this wouldn't disable backface culling so things such as flushing the
clip stack could get confused.

Reviewed-by: Robert Bragg <robert@linux.intel.com>
This commit is contained in:
Neil Roberts
2011-09-15 11:25:39 +01:00
committed by Robert Bragg
parent 879ce7301a
commit dbff3a357e
12 changed files with 258 additions and 103 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
cogl/cogl-context-private.h
View File

@ -74,8 +74,7 @@ struct _CoglContext
/* Enable cache */
unsigned long enable_flags;
gboolean enable_backface_culling;
CoglFrontWinding flushed_front_winding;
gboolean legacy_backface_culling_enabled;
/* A few handy matrix constants */
CoglMatrix identity_matrix;