[Mesa-dev] [PATCH 2/4] gallium: add threads per block TGSI property

[Bas Nieuwenhuizen]

I will change that to

TGSI_PROPERTY_CS_FIXED_BLOCK_WIDTH etc.

since most other properties, seem to use S instead of P,
unless you have any objections.

- Bas

On Sat, Apr 2, 2016 at 12:37 AM, Ilia Mirkin <imirkin at alum.mit.edu> wrote:
> On Fri, Apr 1, 2016 at 6:32 PM, Bas Nieuwenhuizen
> <bas at basnieuwenhuizen.nl> wrote:
>> The value 0 for unknown has been chosen to so that
>> drivers using tgsi_scan_shader do not need to detect
>> missing properties if they zero-initialize the struct.
>>
>> Signed-off-by: Bas Nieuwenhuizen <bas at basnieuwenhuizen.nl>
>> ---
>>  src/gallium/auxiliary/tgsi/tgsi_strings.c  |  3 +++
>>  src/gallium/docs/source/tgsi.rst           |  6 ++++++
>>  src/gallium/include/pipe/p_shader_tokens.h |  5 ++++-
>>  src/mesa/state_tracker/st_glsl_to_tgsi.cpp | 18 ++++++++++++++++++
>>  4 files changed, 31 insertions(+), 1 deletion(-)
>>
>> diff --git a/src/gallium/auxiliary/tgsi/tgsi_strings.c b/src/gallium/auxiliary/tgsi/tgsi_strings.c
>> index ae779a8..2a9f9c5 100644
>> --- a/src/gallium/auxiliary/tgsi/tgsi_strings.c
>> +++ b/src/gallium/auxiliary/tgsi/tgsi_strings.c
>> @@ -146,6 +146,9 @@ const char *tgsi_property_names[TGSI_PROPERTY_COUNT] =
>>     "NUM_CULLDIST_ENABLED",
>>     "FS_EARLY_DEPTH_STENCIL",
>>     "NEXT_SHADER",
>> +   "FIXED_BLOCK_WIDTH",
>> +   "FIXED_BLOCK_HEIGHT",
>> +   "FIXED_BLOCK_DEPTH"
>>  };
>>
>>  const char *tgsi_return_type_names[TGSI_RETURN_TYPE_COUNT] =
>> diff --git a/src/gallium/docs/source/tgsi.rst b/src/gallium/docs/source/tgsi.rst
>> index 3ac6ba3..b5eac9d 100644
>> --- a/src/gallium/docs/source/tgsi.rst
>> +++ b/src/gallium/docs/source/tgsi.rst
>> @@ -3220,6 +3220,12 @@ Which shader stage will MOST LIKELY follow after this shader when the shader
>>  is bound. This is only a hint to the driver and doesn't have to be precise.
>>  Only set for VS and TES.
>>
>> +TGSI_PROPERTY_FIXED_BLOCK_WIDTH / HEIGHT / DEPTH
>> +""""""""""""""""""""""""""""""""""""""""""""""""
>> +
>> +Threads per block in each dimension, if known at compile time. If the block size
>> +is known all three should be at least 1. If it is unknown they should all be set
>> +to 0 or not set.
>>
>>  Texture Sampling and Texture Formats
>>  ------------------------------------
>> diff --git a/src/gallium/include/pipe/p_shader_tokens.h b/src/gallium/include/pipe/p_shader_tokens.h
>> index 5cc18a2..362070c 100644
>> --- a/src/gallium/include/pipe/p_shader_tokens.h
>> +++ b/src/gallium/include/pipe/p_shader_tokens.h
>> @@ -276,7 +276,10 @@ union tgsi_immediate_data
>>  #define TGSI_PROPERTY_NUM_CULLDIST_ENABLED   16
>>  #define TGSI_PROPERTY_FS_EARLY_DEPTH_STENCIL 17
>>  #define TGSI_PROPERTY_NEXT_SHADER            18
>> -#define TGSI_PROPERTY_COUNT                  19
>> +#define TGSI_PROPERTY_FIXED_BLOCK_WIDTH      19
>> +#define TGSI_PROPERTY_FIXED_BLOCK_HEIGHT     20
>> +#define TGSI_PROPERTY_FIXED_BLOCK_DEPTH      21
>
> These types of single-shader-usefulness properties tend to be prefixed
> with the shader type. In this case, CP, i.e.
> TGSI_PROPERTY_CP_FIXED_BLOCK_WIDTH, etc.
>
>> +#define TGSI_PROPERTY_COUNT                  22
>>
>>  struct tgsi_property {
>>     unsigned Type         : 4;  /**< TGSI_TOKEN_TYPE_PROPERTY */
>> diff --git a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
>> index 23786b8..473e782 100644
>> --- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
>> +++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
>> @@ -5935,6 +5935,20 @@ find_array(unsigned attr, struct array_decl *arrays, unsigned count,
>>     return false;
>>  }
>>
>> +static void
>> +emit_compute_block_size(const struct gl_program *program,
>> +                        struct ureg_program *ureg) {
>> +   const struct gl_compute_program *cp =
>> +      (const struct gl_compute_program *)program;
>> +
>> +   ureg_property(ureg, TGSI_PROPERTY_FIXED_BLOCK_WIDTH,
>> +                       cp->LocalSize[0]);
>> +   ureg_property(ureg, TGSI_PROPERTY_FIXED_BLOCK_HEIGHT,
>> +                       cp->LocalSize[1]);
>> +   ureg_property(ureg, TGSI_PROPERTY_FIXED_BLOCK_DEPTH,
>> +                       cp->LocalSize[2]);
>> +}
>> +
>>  /**
>>   * Translate intermediate IR (glsl_to_tgsi_instruction) to TGSI format.
>>   * \param program  the program to translate
>> @@ -6180,6 +6194,10 @@ st_translate_program(
>>        }
>>     }
>>
>> +   if (procType == TGSI_PROCESSOR_COMPUTE) {
>> +      emit_compute_block_size(proginfo, ureg);
>> +   }
>> +
>>     /* Declare address register.
>>      */
>>     if (program->num_address_regs > 0) {
>> --
>> 2.7.4
>>
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