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Diffstat (limited to 'src/gallium/docs/source/context.rst')
| -rw-r--r-- | src/gallium/docs/source/context.rst | 24 |
1 files changed, 11 insertions, 13 deletions
diff --git a/src/gallium/docs/source/context.rst b/src/gallium/docs/source/context.rst index 28096f804b1..af84a2d91f8 100644 --- a/src/gallium/docs/source/context.rst +++ b/src/gallium/docs/source/context.rst @@ -450,21 +450,19 @@ Transfers These methods are used to get data to/from a resource. -``get_transfer`` creates a transfer object. +``transfer_map`` creates a memory mapping and the transfer object +associated with it. +The returned pointer points to the start of the mapped range according to +the box region, not the beginning of the resource. If transfer_map fails, +the returned pointer to the buffer memory is NULL, and the pointer +to the transfer object remains unchanged (i.e. it can be non-NULL). -``transfer_destroy`` destroys the transfer object. May cause -data to be written to the resource at this point. - -``transfer_map`` creates a memory mapping for the transfer object. -The returned map points to the start of the mapped range according to -the box region, not the beginning of the resource. - -``transfer_unmap`` remove the memory mapping for the transfer object. -Any pointers into the map should be considered invalid and discarded. +``transfer_unmap`` remove the memory mapping for and destroy +the transfer object. The pointer into the resource should be considered +invalid and discarded. ``transfer_inline_write`` performs a simplified transfer for simple writes. -Basically get_transfer, transfer_map, data write, transfer_unmap, and -transfer_destroy all in one. +Basically transfer_map, data write, and transfer_unmap all in one. The box parameter to some of these functions defines a 1D, 2D or 3D @@ -515,7 +513,7 @@ These flags control the behavior of a transfer object. Resource contents read back (or accessed directly) at transfer create time. ``PIPE_TRANSFER_WRITE`` - Resource contents will be written back at transfer_destroy time (or modified + Resource contents will be written back at transfer_unmap time (or modified as a result of being accessed directly). ``PIPE_TRANSFER_MAP_DIRECTLY`` |