Am 01.06.2016 um 15:51 schrieb Brian Paul:
> On 06/01/2016 05:28 AM, Nicolai Hähnle wrote:
>> From: Nicolai Hähnle <nicolai.haeh...@amd.com>
>>
>> Cc: 12.0 <mesa-sta...@lists.freedesktop.org>
>> ---
>> src/gallium/auxiliary/tgsi/tgsi_scan.c | 26 ++++++++++++++++++++++++++
>> src/gallium/auxiliary/tgsi/tgsi_scan.h | 1 +
>> 2 files changed, 27 insertions(+)
>>
>> diff --git a/src/gallium/auxiliary/tgsi/tgsi_scan.c
>> b/src/gallium/auxiliary/tgsi/tgsi_scan.c
>> index 1baf031..d202ab1 100644
>> --- a/src/gallium/auxiliary/tgsi/tgsi_scan.c
>> +++ b/src/gallium/auxiliary/tgsi/tgsi_scan.c
>> @@ -68,6 +68,29 @@ is_texture_inst(unsigned opcode)
>> tgsi_get_opcode_info(opcode)->is_tex);
>> }
>>
>> +
>> +/**
>> + * Is the opcode an instruction which computes a derivative
>> explicitly or
>> + * implicitly?
>> + */
>> +static bool
>> +computes_derivative(unsigned opcode)
>> +{
>> + if (tgsi_get_opcode_info(opcode)->is_tex) {
>> + return opcode != TGSI_OPCODE_TXD &&
>> + opcode != TGSI_OPCODE_TXL &&
>> + opcode != TGSI_OPCODE_TXL2 &&
>> + opcode != TGSI_OPCODE_TXF &&
>> + opcode != TGSI_OPCODE_TXQ &&
>> + opcode != TGSI_OPCODE_TXQ_LZ &&
>> + opcode != TGSI_OPCODE_TXQS;
>> + }
>> +
>> + return opcode == TGSI_OPCODE_DDX || opcode == TGSI_OPCODE_DDX_FINE ||
>> + opcode == TGSI_OPCODE_DDY || opcode == TGSI_OPCODE_DDY_FINE;
>> +}
Maybe it should handle the sample opcodes correctly too?
Roland
>> +
>> +
>> static void
>> scan_instruction(struct tgsi_shader_info *info,
>> const struct tgsi_full_instruction *fullinst,
>> @@ -263,6 +286,9 @@ scan_instruction(struct tgsi_shader_info *info,
>> if (is_mem_inst)
>> info->num_memory_instructions++;
>>
>> + if (computes_derivative(fullinst->Instruction.Opcode))
>> + info->uses_derivatives = true;
>> +
>> info->num_instructions++;
>> }
>>
>> diff --git a/src/gallium/auxiliary/tgsi/tgsi_scan.h
>> b/src/gallium/auxiliary/tgsi/tgsi_scan.h
>> index 31adce7..f7eefa4 100644
>> --- a/src/gallium/auxiliary/tgsi/tgsi_scan.h
>> +++ b/src/gallium/auxiliary/tgsi/tgsi_scan.h
>> @@ -115,6 +115,7 @@ struct tgsi_shader_info
>> boolean writes_memory; /**< contains stores or atomics to buffers
>> or images */
>> boolean is_msaa_sampler[PIPE_MAX_SAMPLERS];
>> boolean uses_doubles; /**< uses any of the double instructions */
>> + boolean uses_derivatives;
>> unsigned clipdist_writemask;
>> unsigned culldist_writemask;
>> unsigned num_written_culldistance;
>>
>
> Reviewed-by: Brian Paul <bri...@vmware.com>
>
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