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vkd3d-shader/ir: Transform clip/cull inputs/outputs into arrays.

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Takes care of transforming clip/cull system values from the Direct3D
convention of 2 4-component registers, into the SPIR-V/GLSL convention
of 8-element scalar float arrays.

This fixes SPIR-V validation errors in clip-cull-distance.shader_test,
as well as segfaults on Mesa 25.1.1-arch1.2 if those shaders are
executed regardless.

We create indexable temporaries of the appropriate size, and replace
accesses to clip/cull I/O signature elements with accesses to those
temporaries. The existing clip/cull signature elements are then replaced
with new scalar signature element arrays, and we copy the contents of
those I/O signature elements to/from the corresponding temporaries at
the start/end of the vsir program.

It is worth pointing out that the current implementation assumes that
every instance of the control point phase of a hull shader only writes
to the output registers of its control point, given by
vOutputControlPointID, and not to other control points. Shader
compilation will fail if that constraint is violated.
This commit is contained in:
Francisco Casas
2025-08-22 20:08:21 -04:00
committed by Henri Verbeet
parent 85b7b9c6b4
commit 0dabfdee63
Notes: Henri Verbeet 2025-11-25 20:40:54 +01:00 
Approved-by: Henri Verbeet (@hverbeet)
Merge-Request: https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/1816
4 changed files with 775 additions and 108 deletions
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100
libs/vkd3d-shader/spirv.c
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@@ -5560,11 +5560,13 @@ static const struct vkd3d_symbol *spirv_compiler_emit_io_register(struct spirv_c
const struct vkd3d_spirv_builtin *builtin;
struct vkd3d_symbol reg_symbol;
SpvStorageClass storage_class;
unsigned int array_size;
uint32_t write_mask, id;
struct rb_entry *entry;
VKD3D_ASSERT(!reg->idx_count || !reg->idx[0].rel_addr);
VKD3D_ASSERT(reg->idx_count < 2);
VKD3D_ASSERT(reg->idx_count < 1 || !reg->idx[0].rel_addr);
VKD3D_ASSERT(reg->idx_count < 2 || !reg->idx[1].rel_addr);
VKD3D_ASSERT(reg->idx_count < 3);
if (reg->type == VKD3DSPR_RASTOUT && reg->idx[0].offset == VSIR_RASTOUT_POINT_SIZE)
{
@@ -5582,7 +5584,8 @@ static const struct vkd3d_symbol *spirv_compiler_emit_io_register(struct spirv_c
if ((entry = rb_get(&compiler->symbol_table, &reg_symbol)))
return RB_ENTRY_VALUE(entry, struct vkd3d_symbol, entry);
id = spirv_compiler_emit_builtin_variable(compiler, builtin, storage_class, 0);
array_size = (reg->idx_count > 1) ? reg->idx[0].offset : 0;
id = spirv_compiler_emit_builtin_variable(compiler, builtin, storage_class, array_size);
spirv_compiler_emit_register_execution_mode(compiler, reg->type);
spirv_compiler_emit_register_debug_name(builder, id, reg);
@@ -5646,8 +5649,7 @@ static void spirv_compiler_emit_input(struct spirv_compiler *compiler,
array_sizes[0] = signature_element->register_count;
array_sizes[1] = (reg_type == VKD3DSPR_PATCHCONST ? 0 : compiler->input_control_point_count);
if (!vsir_signature_element_is_array(signature_element)
&& (!vsir_sysval_semantic_is_clip_cull(signature_element->sysval_semantic) || array_sizes[1]))
if (!vsir_signature_element_is_array(signature_element, &compiler->program->normalisation_flags))
array_sizes[0] = 0;
write_mask = signature_element->mask;
@@ -5780,88 +5782,6 @@ static bool is_dual_source_blending(const struct spirv_compiler *compiler)
return compiler->shader_type == VKD3D_SHADER_TYPE_PIXEL && info && info->dual_source_blending;
}
static void calculate_clip_or_cull_distance_mask(const struct signature_element *e, uint32_t *mask)
{
unsigned int write_mask;
if (e->semantic_index >= sizeof(*mask) * CHAR_BIT / VKD3D_VEC4_SIZE)
{
FIXME("Invalid semantic index %u for clip/cull distance.\n", e->semantic_index);
return;
}
write_mask = e->mask;
*mask |= (write_mask & VKD3DSP_WRITEMASK_ALL) << (VKD3D_VEC4_SIZE * e->semantic_index);
}
/* Emits arrayed SPIR-V built-in variables. */
static void spirv_compiler_emit_shader_signature_outputs(struct spirv_compiler *compiler)
{
const struct shader_signature *output_signature = &compiler->program->output_signature;
uint32_t clip_distance_mask = 0, clip_distance_id = 0;
uint32_t cull_distance_mask = 0, cull_distance_id = 0;
const struct vkd3d_spirv_builtin *builtin;
unsigned int i, count;
for (i = 0; i < output_signature->element_count; ++i)
{
const struct signature_element *e = &output_signature->elements[i];
switch (e->sysval_semantic)
{
case VKD3D_SHADER_SV_CLIP_DISTANCE:
calculate_clip_or_cull_distance_mask(e, &clip_distance_mask);
break;
case VKD3D_SHADER_SV_CULL_DISTANCE:
calculate_clip_or_cull_distance_mask(e, &cull_distance_mask);
break;
default:
break;
}
}
if (clip_distance_mask)
{
count = vkd3d_popcount(clip_distance_mask);
builtin = get_spirv_builtin_for_sysval(compiler, VKD3D_SHADER_SV_CLIP_DISTANCE);
clip_distance_id = spirv_compiler_emit_builtin_variable(compiler,
builtin, SpvStorageClassOutput, count);
}
if (cull_distance_mask)
{
count = vkd3d_popcount(cull_distance_mask);
builtin = get_spirv_builtin_for_sysval(compiler, VKD3D_SHADER_SV_CULL_DISTANCE);
cull_distance_id = spirv_compiler_emit_builtin_variable(compiler,
builtin, SpvStorageClassOutput, count);
}
for (i = 0; i < output_signature->element_count; ++i)
{
const struct signature_element *e = &output_signature->elements[i];
switch (e->sysval_semantic)
{
case VKD3D_SHADER_SV_CLIP_DISTANCE:
compiler->output_info[i].id = clip_distance_id;
compiler->output_info[i].data_type = VSIR_DATA_F32;
compiler->output_info[i].array_element_mask = clip_distance_mask;
break;
case VKD3D_SHADER_SV_CULL_DISTANCE:
compiler->output_info[i].id = cull_distance_id;
compiler->output_info[i].data_type = VSIR_DATA_F32;
compiler->output_info[i].array_element_mask = cull_distance_mask;
break;
default:
break;
}
}
}
static uint32_t spirv_compiler_emit_shader_phase_builtin_variable(struct spirv_compiler *compiler,
const struct vkd3d_spirv_builtin *builtin, const unsigned int *array_sizes, unsigned int size_count)
{
@@ -5917,7 +5837,7 @@ static void spirv_compiler_emit_output(struct spirv_compiler *compiler,
sysval = VKD3D_SHADER_SV_NONE;
array_sizes[0] = signature_element->register_count;
array_sizes[1] = (reg_type == VKD3DSPR_PATCHCONST ? 0 : compiler->output_control_point_count);
if (!vsir_signature_element_is_array(signature_element))
if (!vsir_signature_element_is_array(signature_element, &compiler->program->normalisation_flags))
array_sizes[0] = 0;
builtin = vkd3d_get_spirv_builtin(compiler, reg_type, sysval);
@@ -10944,9 +10864,6 @@ static int spirv_compiler_generate_spirv(struct spirv_compiler *compiler,
|| (program->shader_version.type == VKD3D_SHADER_TYPE_HULL && !spirv_compiler_is_opengl_target(compiler)))
spirv_compiler_emit_tessellator_domain(compiler, program->tess_domain);
if (compiler->shader_type != VKD3D_SHADER_TYPE_HULL)
spirv_compiler_emit_shader_signature_outputs(compiler);
it = vsir_program_iterator(&program->instructions);
for (ins = vsir_program_iterator_head(&it); ins && result >= 0; ins = vsir_program_iterator_next(&it))
{
@@ -11048,6 +10965,7 @@ int spirv_compile(struct vsir_program *program, uint64_t config_flags,
return ret;
VKD3D_ASSERT(program->normalisation_level == VSIR_NORMALISED_SM6);
VKD3D_ASSERT(program->normalisation_flags.normalised_clip_cull_arrays);
VKD3D_ASSERT(program->has_descriptor_info);
VKD3D_ASSERT(program->has_no_modifiers);