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gallium: define the behavior of PIPE_USAGE_* flags properly

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STATIC will be removed in the following commit.

v2: changed the definition of IMMUTABLE

Reviewed-by: Brian Paul <brianp@vmware.com>
This commit is contained in:
Marek Olšák
2014-02-03 03:21:29 +01:00
parent ed84fb3167
commit eeb5a4a50e
2 changed files with 18 additions and 11 deletions
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16
src/gallium/docs/source/screen.rst
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@@ -340,12 +340,18 @@ PIPE_USAGE_*
^^^^^^^^^^^^
The PIPE_USAGE enums are hints about the expected usage pattern of a resource.
Note that drivers must always support read and write CPU access at any time
no matter which hint they got.
* ``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, ...
* ``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

13
src/gallium/include/pipe/p_defines.h
View File

@@ -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 */
/**