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-rw-r--r--src/gallium/include/pipe/p_defines.h13
1 files changed, 12 insertions, 1 deletions
diff --git a/src/gallium/include/pipe/p_defines.h b/src/gallium/include/pipe/p_defines.h
index ad42beff47..f8fa1e3f49 100644
--- a/src/gallium/include/pipe/p_defines.h
+++ b/src/gallium/include/pipe/p_defines.h
@@ -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)
};