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tgsi/scan: add uses_derivatives (v2) 

v2:
- TG4 does not calculate derivatives (Ilia)
- also handle SAMPLE* instructions (Roland)

Cc: 12.0 <mesa-stable@lists.freedesktop.org>
Reviewed-by: Marek Olšák <marek.olsak@amd.com> (v1)
Reviewed-by: Brian Paul <brianp@vmware.com> (v1)
Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
This commit is contained in:
Nicolai Hähnle 2016-06-01 13:17:29 +02:00
parent b7a0c0ec7f
commit d3a584defe
2 changed files with 31 additions and 0 deletions
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30
src/gallium/auxiliary/tgsi/tgsi_scan.c
View File

@ -68,6 +68,33 @@ 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_TG4 &&
opcode != TGSI_OPCODE_TXD &&
opcode != TGSI_OPCODE_TXF &&
opcode != TGSI_OPCODE_TXL &&
opcode != TGSI_OPCODE_TXL2 &&
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 ||
opcode == TGSI_OPCODE_SAMPLE ||
opcode == TGSI_OPCODE_SAMPLE_B ||
opcode == TGSI_OPCODE_SAMPLE_C;
}
static void
scan_instruction(struct tgsi_shader_info *info,
const struct tgsi_full_instruction *fullinst,
@ -263,6 +290,9 @@ 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++;
}

1
src/gallium/auxiliary/tgsi/tgsi_scan.h
View File

@ -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;