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vkd3d-shader/msl: Implement VSIR_OP_FIRSTBIT_LO.

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This commit is contained in:
Henri Verbeet
2025-10-22 00:40:33 +02:00
parent 08026880d6
commit c576a09d57
Notes: Henri Verbeet 2025-11-04 15:55:42 +01:00 
Approved-by: Giovanni Mascellani (@giomasce)
Approved-by: Henri Verbeet (@hverbeet)
Merge-Request: https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/1808
2 changed files with 25 additions and 1 deletions
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24
libs/vkd3d-shader/msl.c
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@@ -698,6 +698,27 @@ static void msl_dot(struct msl_generator *gen, const struct vkd3d_shader_instruc
msl_dst_cleanup(&dst, &gen->string_buffers);
}
static void msl_firstbit(struct msl_generator *gen, const struct vkd3d_shader_instruction *ins)
{
unsigned int mask_size;
struct msl_src src;
struct msl_dst dst;
uint32_t mask;
mask = msl_dst_init(&dst, gen, ins, &ins->dst[0]);
msl_src_init(&src, gen, &ins->src[0], mask);
if ((mask_size = vsir_write_mask_component_count(mask)) > 1)
msl_print_assignment(gen, &dst, "select(uint%u(0xffffffffu), ctz(%s), bool%u(%s))",
mask_size, src.str->buffer, mask_size, src.str->buffer);
else
msl_print_assignment(gen, &dst, "%s ? ctz(%s) : 0xffffffffu",
src.str->buffer, src.str->buffer);
msl_src_cleanup(&src, &gen->string_buffers);
msl_dst_cleanup(&dst, &gen->string_buffers);
}
static void msl_intrinsic(struct msl_generator *gen, const struct vkd3d_shader_instruction *ins, const char *op)
{
struct vkd3d_string_buffer *args;
@@ -1499,6 +1520,9 @@ static void msl_handle_instruction(struct msl_generator *gen, const struct vkd3d
case VSIR_OP_EXP:
msl_intrinsic(gen, ins, "exp2");
break;
case VSIR_OP_FIRSTBIT_LO:
msl_firstbit(gen, ins);
break;
case VSIR_OP_FRC:
msl_intrinsic(gen, ins, "fract");
break;