diff options
| -rw-r--r-- | src/gallium/docs/source/screen.rst | 47 |
1 files changed, 24 insertions, 23 deletions
diff --git a/src/gallium/docs/source/screen.rst b/src/gallium/docs/source/screen.rst index f0833bfe541..39938f7bb79 100644 --- a/src/gallium/docs/source/screen.rst +++ b/src/gallium/docs/source/screen.rst @@ -51,6 +51,11 @@ The integer capabilities: * ``MAX_PREDICATE_REGISTERS``: XXX * ``MAX_COMBINED_SAMPLERS``: The total number of samplers accessible from the vertex and fragment shader, inclusive. +* ``MAX_CONST_BUFFERS``: Maximum number of constant buffers that can be bound + to any shader stage using ``set_constant_buffer``. If 0 or 1, the pipe will + only permit binding one constant buffer per shader, and the shaders will + not permit two-dimensional access to constants. +* ``MAX_CONST_BUFFER_SIZE``: Maximum byte size of a single constant buffer. The floating-point capabilities: @@ -61,6 +66,24 @@ The floating-point capabilities: * ``GUARD_BAND_LEFT``, ``GUARD_BAND_TOP``, ``GUARD_BAND_RIGHT``, ``GUARD_BAND_BOTTOM``: XXX +XXX Is there a better home for this? vvv + +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_buffer_usage: PIPE_BUFFER_USAGE @@ -135,29 +158,7 @@ Returns the screen vendor. get_param ^^^^^^^^^ -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 an integer/boolean screen parameter. **param** is one of the :ref:`PIPE_CAP` names. |