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tgsi/scan: set which color components are read by a fragment shader 

This will be used by radeonsi.

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
This commit is contained in:
Marek Olšák 2016-01-01 19:42:44 +01:00
parent 18ec76730a
commit ff7e77724e
2 changed files with 23 additions and 8 deletions
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30
src/gallium/auxiliary/tgsi/tgsi_scan.c
View File

@ -187,14 +187,28 @@ tgsi_scan_shader(const struct tgsi_token *tokens,
}
if (procType == TGSI_PROCESSOR_FRAGMENT &&
!src->Register.Indirect &&
info->input_semantic_name[src->Register.Index] ==
TGSI_SEMANTIC_POSITION &&
(src->Register.SwizzleX == TGSI_SWIZZLE_Z ||
src->Register.SwizzleY == TGSI_SWIZZLE_Z ||
src->Register.SwizzleZ == TGSI_SWIZZLE_Z ||
src->Register.SwizzleW == TGSI_SWIZZLE_Z)) {
info->reads_z = TRUE;
!src->Register.Indirect) {
unsigned name =
info->input_semantic_name[src->Register.Index];
unsigned index =
info->input_semantic_index[src->Register.Index];
if (name == TGSI_SEMANTIC_POSITION &&
(src->Register.SwizzleX == TGSI_SWIZZLE_Z ||
src->Register.SwizzleY == TGSI_SWIZZLE_Z ||
src->Register.SwizzleZ == TGSI_SWIZZLE_Z ||
src->Register.SwizzleW == TGSI_SWIZZLE_Z))
info->reads_z = TRUE;
if (name == TGSI_SEMANTIC_COLOR) {
unsigned mask =
(1 << src->Register.SwizzleX) |
(1 << src->Register.SwizzleY) |
(1 << src->Register.SwizzleZ) |
(1 << src->Register.SwizzleW);
info->colors_read |= mask << (index * 4);
}
}
}

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

@ -77,6 +77,7 @@ struct tgsi_shader_info
uint opcode_count[TGSI_OPCODE_LAST]; /**< opcode histogram */
ubyte colors_read; /**< which color components are read by the FS */
ubyte colors_written;
boolean reads_position; /**< does fragment shader read position? */
boolean reads_z; /**< does fragment shader read depth? */