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| -rw-r--r-- | src/gallium/docs/source/screen.rst | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/src/gallium/docs/source/screen.rst b/src/gallium/docs/source/screen.rst index 1fff20f5398..905ff24db99 100644 --- a/src/gallium/docs/source/screen.rst +++ b/src/gallium/docs/source/screen.rst @@ -78,7 +78,29 @@ Returns the screen vendor. get_param ^^^^^^^^^ -Get an integer/boolean screen parameter. +Get an integer/boolean screen parameter. Valid parameter names include. + +* ``PIPE_CAP_MAX_CONST_BUFFERS``: Maximum number of constant buffers that + can be bound to any shader stage using ``set_constant_buffer``. + + If 0 is returned, the driver is not aware of multiple constant buffers, + supports binding of only one constant buffer, and does not support + two-dimensional CONST register file access in TGSI shaders. + + If a value greater than 0 is returned, the driver can have multiple + constant buffers bound to shader stages. The CONST register file can + be accessed with two-dimensional indices, like in the example below. + + DCL CONST[0][0..7] # declare first 8 vectors of constbuf 0 + DCL CONST[3][0] # declare first vector of constbuf 3 + MOV OUT[0], CONST[0][3] # copy vector 3 of constbuf 0 + + For backwards compatibility, one-dimensional access to CONST register + file is still supported. In that case, the constbuf index is assumed + to be 0. + +* ``PIPE_CAP_MAX_CONST_BUFFER_SIZE``: Maximum byte size of a single constant + buffer. get_paramf ^^^^^^^^^^ |