diff options
Diffstat (limited to 'exa/exa.h')
| -rw-r--r-- | exa/exa.h | 17 |
1 files changed, 9 insertions, 8 deletions
@@ -586,14 +586,14 @@ typedef struct _ExaDriver { * untiling, or to adjust the pixmap's devPrivate.ptr for the purpose of * making CPU access use a different aperture. * - * The index is one of #EXA_PREPARE_DEST, #EXA_PREPARE_SRC, or - * #EXA_PREPARE_MASK, indicating which pixmap is in question. Since only up - * to three pixmaps will have PrepareAccess() called on them per operation, - * drivers can have a small, statically-allocated space to maintain state - * for PrepareAccess() and FinishAccess() in. Note that the same pixmap may - * have PrepareAccess() called on it more than once, for example when doing - * a copy within the same pixmap (so it gets PrepareAccess as() - * #EXA_PREPARE_DEST and then as #EXA_PREPARE_SRC). + * The index is one of #EXA_PREPARE_DEST, #EXA_PREPARE_SRC, + * #EXA_PREPARE_MASK, #EXA_PREPARE_AUX_DEST, #EXA_PREPARE_AUX_SRC, or + * #EXA_PREPARE_AUX_MASK. Since only up to #EXA_NUM_PREPARE_INDICES pixmaps + * will have PrepareAccess() called on them per operation, drivers can have + * a small, statically-allocated space to maintain state for PrepareAccess() + * and FinishAccess() in. Note that PrepareAccess() is only called once per + * pixmap and operation, regardless of whether the pixmap is used as a + * destination and/or source, and the index may not reflect the usage. * * PrepareAccess() may fail. An example might be the case of hardware that * can set up 1 or 2 surfaces for CPU access, but not 3. If PrepareAccess() @@ -663,6 +663,7 @@ typedef struct _ExaDriver { #define EXA_PREPARE_AUX_DEST 3 #define EXA_PREPARE_AUX_SRC 4 #define EXA_PREPARE_AUX_MASK 5 + #define EXA_NUM_PREPARE_INDICES 6 /** @} */ /** |