diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/gallium/docs/source/screen.rst | 18 | ||||
| -rw-r--r-- | src/gallium/include/pipe/p_defines.h | 13 |
2 files changed, 19 insertions, 12 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 diff --git a/src/gallium/include/pipe/p_defines.h b/src/gallium/include/pipe/p_defines.h index 183726c0666..85385380970 100644 --- a/src/gallium/include/pipe/p_defines.h +++ b/src/gallium/include/pipe/p_defines.h @@ -356,13 +356,14 @@ enum pipe_flush_flags { #define PIPE_RESOURCE_FLAG_ST_PRIV (1 << 24) /* state-tracker/winsys private */ /* Hint about the expected lifecycle of a resource. + * Sorted according to GPU vs CPU access. */ -#define PIPE_USAGE_DEFAULT 0 /* many uploads, draws intermixed */ -#define PIPE_USAGE_DYNAMIC 1 /* many uploads, draws intermixed */ -#define PIPE_USAGE_STATIC 2 /* same as immutable?? */ -#define PIPE_USAGE_IMMUTABLE 3 /* no change after first upload */ -#define PIPE_USAGE_STREAM 4 /* upload, draw, upload, draw */ -#define PIPE_USAGE_STAGING 5 /* supports data transfers from the GPU to the CPU */ +#define PIPE_USAGE_DEFAULT 0 /* fast GPU access */ +#define PIPE_USAGE_IMMUTABLE 1 /* fast GPU access, immutable */ +#define PIPE_USAGE_DYNAMIC 2 /* uploaded data is used multiple times */ +#define PIPE_USAGE_STREAM 3 /* uploaded data is used once */ +#define PIPE_USAGE_STAGING 4 /* fast CPU access */ +#define PIPE_USAGE_STATIC 5 /* same as DEFAULT, will be removed */ /** |