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gallium: Add PIPE_TRANSFER_MAP_DIRECTLY usage flag.

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Asks the driver to map the texture storage directly or return NULL if that's
not possible.
This commit is contained in:
Michel Dänzer 2009-10-02 18:13:26 +02:00
parent 47e41b024e
commit 9db647bb7a
1 changed files with 12 additions and 1 deletions
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13
src/gallium/include/pipe/p_defines.h
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@ -193,7 +193,18 @@ enum pipe_texture_target {
enum pipe_transfer_usage {
PIPE_TRANSFER_READ = (1 << 0),
PIPE_TRANSFER_WRITE = (1 << 1),
PIPE_TRANSFER_READ_WRITE = PIPE_TRANSFER_READ | PIPE_TRANSFER_WRITE /**< Read/modify/write */
/** Read/modify/write */
PIPE_TRANSFER_READ_WRITE = PIPE_TRANSFER_READ | PIPE_TRANSFER_WRITE,
/**
* The transfer should map the texture storage directly. The driver may
* return NULL if that isn't possible, and the state tracker needs to cope
* with that and use an alternative path without this flag.
*
* E.g. the state tracker could have a simpler path which maps textures and
* does read/modify/write cycles on them directly, and a more complicated
* path which uses minimal read and write transfers.
*/
PIPE_TRANSFER_MAP_DIRECTLY = (1 << 2)
};