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vkd3d-shader/ir: Use iterators in vsir_program_ensure_diffuse().

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The change in vsir_program_iterator_next() is necessary to allow us to
introduce instructions before the iterator using:

    vsir_program_iterator_prev(&it);
    vsir_program_iterator_inset_after(&it, n);
    vsir_program_iterator_next(&it);

This since (it.idx == SIZE_MAX) is equivalent to the iterator being
before the beginning of the list.
This commit is contained in:
Francisco Casas
2025-07-31 18:08:07 -04:00
committed by Henri Verbeet
parent ce20f9d4b2
commit 6dc9ff1bd8
Notes: Henri Verbeet 2025-08-06 13:02:54 +02:00 
Approved-by: Henri Verbeet (@hverbeet)
Merge-Request: https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/1669
2 changed files with 15 additions and 6 deletions
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10
libs/vkd3d-shader/ir.c
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@@ -1814,6 +1814,7 @@ static enum vkd3d_result vsir_program_add_diffuse_output(struct vsir_program *pr
static enum vkd3d_result vsir_program_ensure_diffuse(struct vsir_program *program,
struct vsir_transformation_context *ctx)
{
struct vsir_program_iterator it = vsir_program_iterator(&program->instructions);
static const struct vkd3d_shader_location no_loc;
struct vkd3d_shader_instruction *ins;
unsigned int i;
@@ -1825,17 +1826,16 @@ static enum vkd3d_result vsir_program_ensure_diffuse(struct vsir_program *progra
/* Write the instruction after all LABEL, DCL, and NOP instructions.
* We need to skip NOP instructions because they might result from removed
* DCLs, and there could still be DCLs after NOPs. */
for (i = 0; i < program->instructions.count; ++i)
for (ins = vsir_program_iterator_head(&it); ins; ins = vsir_program_iterator_next(&it))
{
ins = &program->instructions.elements[i];
if (!vsir_instruction_is_dcl(ins) && ins->opcode != VSIR_OP_LABEL && ins->opcode != VSIR_OP_NOP)
break;
}
if (!shader_instruction_array_insert_at(&program->instructions, i, 1))
vsir_program_iterator_prev(&it);
if (!vsir_program_iterator_insert_after(&it, 1))
return VKD3D_ERROR_OUT_OF_MEMORY;
ins = &program->instructions.elements[i];
ins = vsir_program_iterator_next(&it);
vsir_instruction_init_with_params(program, ins, &no_loc, VSIR_OP_MOV, 1, 1);
vsir_dst_param_init(&ins->dst[0], VKD3DSPR_ATTROUT, VSIR_DATA_F32, 1);