[Mesa-dev] [PATCH] gallium: add support for layered rendering

[Alex Deucher]

On Fri, May 31, 2013 at 6:54 PM, Roland Scheidegger <sroland at vmware.com> wrote:
> Am 31.05.2013 23:43, schrieb sroland at vmware.com:
>> From: Roland Scheidegger <sroland at vmware.com>
>>
>> Since pipe_surface already has all the necessary fields no interface
>> changes are necessary except adding a new shader semantic value
>> (TGSI_SEMANTIC_LAYER), though add a pipe capability bit for it as well.
>> (Note that what GL knows as "gl_Layer" variable d3d10 is naming
>> "RENDER_TARGET_ARRAY_INDEX")
>> ---
>>  src/gallium/docs/source/screen.rst         |    2 ++
>>  src/gallium/include/pipe/p_defines.h       |    3 ++-
>>  src/gallium/include/pipe/p_shader_tokens.h |    3 ++-
>>  3 files changed, 6 insertions(+), 2 deletions(-)
>>
>> diff --git a/src/gallium/docs/source/screen.rst b/src/gallium/docs/source/screen.rst
>> index 683080c..b74b237 100644
>> --- a/src/gallium/docs/source/screen.rst
>> +++ b/src/gallium/docs/source/screen.rst
>> @@ -168,6 +168,8 @@ The integer capabilities:
>>    since they are linked) a driver can support. Returning 0 is equivalent
>>    to returning 1 because every driver has to support at least a single
>>    viewport/scissor combination.
>> +* ``PIPE_CAP_LAYERED_RENDERING``: Whether rendering to multiple layers is
>> +  supported using layer selection by the TGSI_SEMANTIC_LAYER shader variable.
>>
>>
>>  .. _pipe_capf:
>> diff --git a/src/gallium/include/pipe/p_defines.h b/src/gallium/include/pipe/p_defines.h
>> index 8af1a84..c359a9e 100644
>> --- a/src/gallium/include/pipe/p_defines.h
>> +++ b/src/gallium/include/pipe/p_defines.h
>> @@ -508,7 +508,8 @@ enum pipe_cap {
>>     PIPE_CAP_QUERY_PIPELINE_STATISTICS = 81,
>>     PIPE_CAP_TEXTURE_BORDER_COLOR_QUIRK = 82,
>>     PIPE_CAP_MAX_TEXTURE_BUFFER_SIZE = 83,
>> -   PIPE_CAP_MAX_VIEWPORTS = 84
>> +   PIPE_CAP_MAX_VIEWPORTS = 84,
>> +   PIPE_CAP_MULTIPLE_LAYERS = 85
>>  };
> Actually I don't think is a good name, PIPE_CAP_LAYERED_RENDERING might
> be better?
> I'm open to just about any suggestion though :-).

FWIW, I prefer PIPE_CAP_LAYERED_RENDERING as well.  Other colors:

PIPE_CAP_RENDER_TARGET_INDEX
PIPE_CAP_RENDER_TARGET_ARRAY_INDEX
PIPE_CAP_RENDER_TARGET_LAYERS

Alex

>
> Roland
>
>
>>
>>  #define PIPE_QUIRK_TEXTURE_BORDER_COLOR_SWIZZLE_NV50 (1 << 0)
>> diff --git a/src/gallium/include/pipe/p_shader_tokens.h b/src/gallium/include/pipe/p_shader_tokens.h
>> index b33cf1d..c984d50 100644
>> --- a/src/gallium/include/pipe/p_shader_tokens.h
>> +++ b/src/gallium/include/pipe/p_shader_tokens.h
>> @@ -165,7 +165,8 @@ struct tgsi_declaration_interp
>>  #define TGSI_SEMANTIC_TEXCOORD   19 /**< texture or sprite coordinates */
>>  #define TGSI_SEMANTIC_PCOORD     20 /**< point sprite coordinate */
>>  #define TGSI_SEMANTIC_VIEWPORT_INDEX 21 /**< viewport index */
>> -#define TGSI_SEMANTIC_COUNT      22 /**< number of semantic values */
>> +#define TGSI_SEMANTIC_LAYER      22 /**< layer (rendertarget index) */
>> +#define TGSI_SEMANTIC_COUNT      23 /**< number of semantic values */
>>
>>  struct tgsi_declaration_semantic
>>  {
>>
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