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vkd3d-shader/dxil: Emit SAMPLER, UAV and RESOURCE registers with only 2 indices.

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DXIL handles are used to represent descriptors. Currently they are
translated to registers of the appropriate type (depending on the
descriptor type) and three indices. The first two indices are used
to represent the descriptor itself (through its signature and array
index), and are filled when the handle itself is created. The last
index is used with constant buffers to address the data inside the
buffer itself, and it goes unused with other descriptor types.

As currently implemented, however, registers for descriptors other
than constant buffers are still created with three indices, even if
the last one is useless and set to -1. In the interest of creating
more sensible VSIR code, this is now removed: DXIL handles are
created with just two indices; a third one is added when accessing
constant buffers, and nothing is changed for other descriptor types.
This commit is contained in:
Giovanni Mascellani 2024-09-27 14:53:07 +02:00 committed by Henri Verbeet
parent cebe0a8b95
commit da7c9694f1
Notes: Henri Verbeet 2024-10-03 19:35:06 +02:00 
Approved-by: Giovanni Mascellani (@giomasce)
Approved-by: Henri Verbeet (@hverbeet)
Merge-Request: https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/1142
1 changed files with 4 additions and 3 deletions
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7
libs/vkd3d-shader/dxil.c
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@ -4864,8 +4864,10 @@ static void sm6_parser_emit_dx_cbuffer_load(struct sm6_parser *sm6, enum dx_intr
if (!(src_param = instruction_src_params_alloc(ins, 1, sm6)))
return;
src_param_init_vector_from_reg(src_param, &buffer->u.handle.reg);
/* Differently from other descriptors, constant buffers require an
* additional index, used to index within the constant buffer itself. */
src_param->reg.idx_count = 3;
register_index_address_init(&src_param->reg.idx[2], operands[1], sm6);
VKD3D_ASSERT(src_param->reg.idx_count == 3);
type = sm6_type_get_scalar_type(dst->type, 0);
VKD3D_ASSERT(type);
@ -4964,8 +4966,7 @@ static void sm6_parser_emit_dx_create_handle(struct sm6_parser *sm6, enum dx_int
dst->u.handle.d = d;
reg = &dst->u.handle.reg;
/* Set idx_count to 3 for use with load/store instructions. */
vsir_register_init(reg, d->reg_type, d->reg_data_type, 3);
vsir_register_init(reg, d->reg_type, d->reg_data_type, 2);
reg->dimension = VSIR_DIMENSION_VEC4;
reg->idx[0].offset = id;
register_index_address_init(&reg->idx[1], operands[2], sm6);