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Diffstat (limited to 'src/gallium/docs')
| -rw-r--r-- | src/gallium/docs/source/screen.rst | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/src/gallium/docs/source/screen.rst b/src/gallium/docs/source/screen.rst index ed8e8322e8f..0c9c2749dfe 100644 --- a/src/gallium/docs/source/screen.rst +++ b/src/gallium/docs/source/screen.rst @@ -340,12 +340,18 @@ PIPE_USAGE_* ^^^^^^^^^^^^ The PIPE_USAGE enums are hints about the expected usage pattern of a resource. - -* ``PIPE_USAGE_DEFAULT``: Expect many uploads to the resource, intermixed with draws. -* ``PIPE_USAGE_DYNAMIC``: Expect many uploads to the resource, intermixed with draws. -* ``PIPE_USAGE_STATIC``: Same as immutable (?) -* ``PIPE_USAGE_IMMUTABLE``: Resource will not be changed after first upload. -* ``PIPE_USAGE_STREAM``: Upload will be followed by draw, followed by upload, ... +Note that drivers must always support read and write CPU access at any time +no matter which hint they got. + +* ``PIPE_USAGE_DEFAULT``: Optimized for fast GPU access. +* ``PIPE_USAGE_IMMUTABLE``: Optimized for fast GPU access and the resource is + not expected to be mapped or changed (even by the GPU) after the first upload. +* ``PIPE_USAGE_DYNAMIC``: Expect frequent write-only CPU access. What is + uploaded is expected to be used at least several times by the GPU. +* ``PIPE_USAGE_STATIC``: Same as PIPE_USAGE_DEFAULT. +* ``PIPE_USAGE_STREAM``: Expect frequent write-only CPU access. What is + uploaded is expected to be used only once by the GPU. +* ``PIPE_USAGE_STAGING``: Optimized for fast CPU access. Methods |