static unsigned
type_size(const struct glsl_type *type)
{
unsigned int size, i;
switch (glsl_get_base_type(type)) {
case GLSL_TYPE_UINT:
case GLSL_TYPE_INT:
case GLSL_TYPE_FLOAT:
case GLSL_TYPE_BOOL:
return glsl_get_components(type);
case GLSL_TYPE_ARRAY:
return type_size(glsl_get_array_element(type)) * glsl_get_length(type);
case GLSL_TYPE_STRUCT:
size = 0;
for (i = 0; i < glsl_get_length(type); i++) {
size += type_size(glsl_get_struct_field(type, i));
}
return size;
case GLSL_TYPE_SAMPLER:
return 0;
case GLSL_TYPE_ATOMIC_UINT:
return 0;
case GLSL_TYPE_INTERFACE:
return 0;
case GLSL_TYPE_IMAGE:
return 0;
case GLSL_TYPE_VOID:
case GLSL_TYPE_ERROR:
case GLSL_TYPE_DOUBLE:
unreachable("not reached");
}
return 0;
}
static nir_register *
get_reg_for_deref(nir_deref_instr *deref, struct locals_to_regs_state *state)
{
uint32_t hash = hash_deref(deref);
assert(nir_deref_instr_get_variable(deref)->constant_initializer == NULL);
struct hash_entry *entry =
_mesa_hash_table_search_pre_hashed(state->regs_table, hash, deref);
if (entry)
return entry->data;
unsigned array_size = 1;
for (nir_deref_instr *d = deref; d; d = nir_deref_instr_parent(d)) {
if (d->deref_type == nir_deref_type_array)
array_size *= glsl_get_length(nir_deref_instr_parent(d)->type);
}
assert(glsl_type_is_vector_or_scalar(deref->type));
nir_register *reg = nir_local_reg_create(state->builder.impl);
reg->num_components = glsl_get_vector_elements(deref->type);
reg->num_array_elems = array_size > 1 ? array_size : 0;
reg->bit_size = glsl_get_bit_size(deref->type);
_mesa_hash_table_insert_pre_hashed(state->regs_table, hash, deref, reg);
return reg;
}
static nir_register *
get_reg_for_deref(nir_deref_var *deref, struct locals_to_regs_state *state)
{
uint32_t hash = hash_deref(deref);
struct hash_entry *entry =
_mesa_hash_table_search_pre_hashed(state->regs_table, hash, deref);
if (entry)
return entry->data;
unsigned array_size = 1;
nir_deref *tail = &deref->deref;
while (tail->child) {
if (tail->child->deref_type == nir_deref_type_array)
array_size *= glsl_get_length(tail->type);
tail = tail->child;
}
assert(glsl_type_is_vector(tail->type) || glsl_type_is_scalar(tail->type));
nir_register *reg = nir_local_reg_create(state->impl);
reg->num_components = glsl_get_vector_elements(tail->type);
reg->num_array_elems = array_size > 1 ? array_size : 0;
reg->bit_size = glsl_get_bit_size(glsl_get_base_type(tail->type));
_mesa_hash_table_insert_pre_hashed(state->regs_table, hash, deref, reg);
nir_array_add(&state->derefs_array, nir_deref_var *, deref);
return reg;
}
const glsl_type *
glsl_channel_type(const glsl_type *t)
{
switch (glsl_get_base_type(t)) {
case GLSL_TYPE_ARRAY: {
const glsl_type *base = glsl_channel_type(glsl_get_array_element(t));
return glsl_array_type(base, glsl_get_length(t));
}
case GLSL_TYPE_UINT:
return glsl_uint_type();
case GLSL_TYPE_INT:
return glsl_int_type();
case GLSL_TYPE_FLOAT:
return glsl_float_type();
case GLSL_TYPE_BOOL:
return glsl_bool_type();
case GLSL_TYPE_DOUBLE:
return glsl_double_type();
case GLSL_TYPE_UINT64:
return glsl_uint64_t_type();
case GLSL_TYPE_INT64:
return glsl_int64_t_type();
case GLSL_TYPE_FLOAT16:
return glsl_float16_t_type();
case GLSL_TYPE_UINT16:
return glsl_uint16_t_type();
case GLSL_TYPE_INT16:
return glsl_int16_t_type();
default:
unreachable("Unhandled base type glsl_channel_type()");
}
}
/* Tries to compute the size of an interface block based on the strides and
* offsets that are provided to us in the SPIR-V source.
*/
static unsigned
vtn_type_block_size(struct vtn_type *type)
{
enum glsl_base_type base_type = glsl_get_base_type(type->type);
switch (base_type) {
case GLSL_TYPE_UINT:
case GLSL_TYPE_INT:
case GLSL_TYPE_FLOAT:
case GLSL_TYPE_BOOL:
case GLSL_TYPE_DOUBLE: {
unsigned cols = type->row_major ? glsl_get_vector_elements(type->type) :
glsl_get_matrix_columns(type->type);
if (cols > 1) {
assert(type->stride > 0);
return type->stride * cols;
} else if (base_type == GLSL_TYPE_DOUBLE) {
return glsl_get_vector_elements(type->type) * 8;
} else {
return glsl_get_vector_elements(type->type) * 4;
}
}
case GLSL_TYPE_STRUCT:
case GLSL_TYPE_INTERFACE: {
unsigned size = 0;
unsigned num_fields = glsl_get_length(type->type);
for (unsigned f = 0; f < num_fields; f++) {
unsigned field_end = type->offsets[f] +
vtn_type_block_size(type->members[f]);
size = MAX2(size, field_end);
}
return size;
}
case GLSL_TYPE_ARRAY:
assert(type->stride > 0);
assert(glsl_get_length(type->type) > 0);
return type->stride * glsl_get_length(type->type);
default:
assert(!"Invalid block type");
return 0;
}
}
static void
_vtn_variable_load_store(struct vtn_builder *b, bool load,
struct vtn_access_chain *chain,
struct vtn_type *tail_type,
struct vtn_ssa_value **inout)
{
enum glsl_base_type base_type = glsl_get_base_type(tail_type->type);
switch (base_type) {
case GLSL_TYPE_UINT:
case GLSL_TYPE_INT:
case GLSL_TYPE_FLOAT:
case GLSL_TYPE_BOOL:
/* At this point, we have a scalar, vector, or matrix so we know that
* there cannot be any structure splitting still in the way. By
* stopping at the matrix level rather than the vector level, we
* ensure that matrices get loaded in the optimal way even if they
* are storred row-major in a UBO.
*/
if (load) {
*inout = vtn_local_load(b, vtn_access_chain_to_deref(b, chain));
} else {
vtn_local_store(b, *inout, vtn_access_chain_to_deref(b, chain));
}
return;
case GLSL_TYPE_ARRAY:
case GLSL_TYPE_STRUCT: {
struct vtn_access_chain *new_chain =
vtn_access_chain_extend(b, chain, 1);
new_chain->link[chain->length].mode = vtn_access_mode_literal;
unsigned elems = glsl_get_length(tail_type->type);
if (load) {
assert(*inout == NULL);
*inout = rzalloc(b, struct vtn_ssa_value);
(*inout)->type = tail_type->type;
(*inout)->elems = rzalloc_array(b, struct vtn_ssa_value *, elems);
}
for (unsigned i = 0; i < elems; i++) {
new_chain->link[chain->length].id = i;
struct vtn_type *elem_type = base_type == GLSL_TYPE_ARRAY ?
tail_type->array_element : tail_type->members[i];
_vtn_variable_load_store(b, load, new_chain, elem_type,
&(*inout)->elems[i]);
}
return;
}
default:
unreachable("Invalid access chain type");
}
}
static nir_src
get_deref_reg_src(nir_deref_instr *deref, struct locals_to_regs_state *state)
{
nir_builder *b = &state->builder;
nir_src src;
src.is_ssa = false;
src.reg.reg = get_reg_for_deref(deref, state);
src.reg.base_offset = 0;
src.reg.indirect = NULL;
/* It is possible for a user to create a shader that has an array with a
* single element and then proceed to access it indirectly. Indirectly
* accessing a non-array register is not allowed in NIR. In order to
* handle this case we just convert it to a direct reference.
*/
if (src.reg.reg->num_array_elems == 0)
return src;
unsigned inner_array_size = 1;
for (const nir_deref_instr *d = deref; d; d = nir_deref_instr_parent(d)) {
if (d->deref_type != nir_deref_type_array)
continue;
if (nir_src_is_const(d->arr.index) && !src.reg.indirect) {
src.reg.base_offset += nir_src_as_uint(d->arr.index) *
inner_array_size;
} else {
if (src.reg.indirect) {
assert(src.reg.base_offset == 0);
} else {
src.reg.indirect = ralloc(b->shader, nir_src);
*src.reg.indirect =
nir_src_for_ssa(nir_imm_int(b, src.reg.base_offset));
src.reg.base_offset = 0;
}
assert(src.reg.indirect->is_ssa);
nir_ssa_def *index = nir_i2i(b, nir_ssa_for_src(b, d->arr.index, 1), 32);
src.reg.indirect->ssa =
nir_iadd(b, src.reg.indirect->ssa,
nir_imul(b, index, nir_imm_int(b, inner_array_size)));
}
inner_array_size *= glsl_get_length(nir_deref_instr_parent(d)->type);
}
return src;
}
/* Calculate the sampler index based on array indicies and also
* calculate the base uniform location for struct members.
*/
static void
calc_sampler_offsets(nir_deref *tail, nir_tex_instr *instr,
unsigned *array_elements, nir_ssa_def **indirect,
nir_builder *b, unsigned *location)
{
if (tail->child == NULL)
return;
switch (tail->child->deref_type) {
case nir_deref_type_array: {
nir_deref_array *deref_array = nir_deref_as_array(tail->child);
assert(deref_array->deref_array_type != nir_deref_array_type_wildcard);
calc_sampler_offsets(tail->child, instr, array_elements,
indirect, b, location);
instr->sampler_index += deref_array->base_offset * *array_elements;
if (deref_array->deref_array_type == nir_deref_array_type_indirect) {
nir_ssa_def *mul =
nir_imul(b, nir_imm_int(b, *array_elements),
nir_ssa_for_src(b, deref_array->indirect, 1));
nir_instr_rewrite_src(&instr->instr, &deref_array->indirect,
NIR_SRC_INIT);
if (*indirect) {
*indirect = nir_iadd(b, *indirect, mul);
} else {
*indirect = mul;
}
}
*array_elements *= glsl_get_length(tail->type);
break;
}
case nir_deref_type_struct: {
nir_deref_struct *deref_struct = nir_deref_as_struct(tail->child);
*location += glsl_get_record_location_offset(tail->type, deref_struct->index);
calc_sampler_offsets(tail->child, instr, array_elements,
indirect, b, location);
break;
}
default:
unreachable("Invalid deref type");
break;
}
}
static struct deref_node *
deref_node_create(struct deref_node *parent,
const struct glsl_type *type, nir_shader *shader)
{
size_t size = sizeof(struct deref_node) +
glsl_get_length(type) * sizeof(struct deref_node *);
struct deref_node *node = rzalloc_size(shader, size);
node->type = type;
node->parent = parent;
node->deref = NULL;
exec_node_init(&node->direct_derefs_link);
return node;
}
static void
emit_load_store(nir_builder *b, nir_intrinsic_instr *orig_instr,
nir_deref_var *deref, nir_deref *tail,
nir_ssa_def **dest, nir_ssa_def *src)
{
for (; tail->child; tail = tail->child) {
if (tail->child->deref_type != nir_deref_type_array)
continue;
nir_deref_array *arr = nir_deref_as_array(tail->child);
if (arr->deref_array_type != nir_deref_array_type_indirect)
continue;
int length = glsl_get_length(tail->type);
emit_indirect_load_store(b, orig_instr, deref, tail, -arr->base_offset,
length - arr->base_offset, dest, src);
return;
}
assert(tail && tail->child == NULL);
/* We reached the end of the deref chain. Emit the instruction */
if (src == NULL) {
/* This is a load instruction */
nir_intrinsic_instr *load =
nir_intrinsic_instr_create(b->shader, nir_intrinsic_load_var);
load->num_components = orig_instr->num_components;
load->variables[0] =
nir_deref_as_var(nir_copy_deref(load, &deref->deref));
unsigned bit_size = orig_instr->dest.ssa.bit_size;
nir_ssa_dest_init(&load->instr, &load->dest,
load->num_components, bit_size, NULL);
nir_builder_instr_insert(b, &load->instr);
*dest = &load->dest.ssa;
} else {
/* This is a store instruction */
nir_intrinsic_instr *store =
nir_intrinsic_instr_create(b->shader, nir_intrinsic_store_var);
store->num_components = orig_instr->num_components;
nir_intrinsic_set_write_mask(store, nir_intrinsic_write_mask(orig_instr));
store->variables[0] =
nir_deref_as_var(nir_copy_deref(store, &deref->deref));
store->src[0] = nir_src_for_ssa(src);
nir_builder_instr_insert(b, &store->instr);
}
}
/**
* Mark an entire variable as used. Caller must ensure that the variable
* represents a shader input or output.
*/
static void
mark_whole_variable(nir_shader *shader, nir_variable *var, bool is_output_read)
{
const struct glsl_type *type = var->type;
if (nir_is_per_vertex_io(var, shader->info.stage)) {
assert(glsl_type_is_array(type));
type = glsl_get_array_element(type);
}
const unsigned slots =
var->data.compact ? DIV_ROUND_UP(glsl_get_length(type), 4)
: glsl_count_attribute_slots(type, false);
set_io_mask(shader, var, 0, slots, is_output_read);
}
static void
vtn_build_subgroup_instr(struct vtn_builder *b,
nir_intrinsic_op nir_op,
struct vtn_ssa_value *dst,
struct vtn_ssa_value *src0,
nir_ssa_def *index,
unsigned const_idx0,
unsigned const_idx1)
{
/* Some of the subgroup operations take an index. SPIR-V allows this to be
* any integer type. To make things simpler for drivers, we only support
* 32-bit indices.
*/
if (index && index->bit_size != 32)
index = nir_u2u32(&b->nb, index);
vtn_assert(dst->type == src0->type);
if (!glsl_type_is_vector_or_scalar(dst->type)) {
for (unsigned i = 0; i < glsl_get_length(dst->type); i++) {
vtn_build_subgroup_instr(b, nir_op, dst->elems[i],
src0->elems[i], index,
const_idx0, const_idx1);
}
return;
}
nir_intrinsic_instr *intrin =
nir_intrinsic_instr_create(b->nb.shader, nir_op);
nir_ssa_dest_init_for_type(&intrin->instr, &intrin->dest,
dst->type, NULL);
intrin->num_components = intrin->dest.ssa.num_components;
intrin->src[0] = nir_src_for_ssa(src0->def);
if (index)
intrin->src[1] = nir_src_for_ssa(index);
intrin->const_index[0] = const_idx0;
intrin->const_index[1] = const_idx1;
nir_builder_instr_insert(&b->nb, &intrin->instr);
dst->def = &intrin->dest.ssa;
}
static void
_vtn_variable_copy(struct vtn_builder *b, struct vtn_access_chain *dest,
struct vtn_access_chain *src, struct vtn_type *tail_type)
{
enum glsl_base_type base_type = glsl_get_base_type(tail_type->type);
switch (base_type) {
case GLSL_TYPE_UINT:
case GLSL_TYPE_INT:
case GLSL_TYPE_FLOAT:
case GLSL_TYPE_BOOL:
/* At this point, we have a scalar, vector, or matrix so we know that
* there cannot be any structure splitting still in the way. By
* stopping at the matrix level rather than the vector level, we
* ensure that matrices get loaded in the optimal way even if they
* are storred row-major in a UBO.
*/
vtn_variable_store(b, vtn_variable_load(b, src), dest);
return;
case GLSL_TYPE_ARRAY:
case GLSL_TYPE_STRUCT: {
struct vtn_access_chain *new_src, *new_dest;
new_src = vtn_access_chain_extend(b, src, 1);
new_dest = vtn_access_chain_extend(b, dest, 1);
new_src->link[src->length].mode = vtn_access_mode_literal;
new_dest->link[dest->length].mode = vtn_access_mode_literal;
unsigned elems = glsl_get_length(tail_type->type);
for (unsigned i = 0; i < elems; i++) {
new_src->link[src->length].id = i;
new_dest->link[dest->length].id = i;
struct vtn_type *elem_type = base_type == GLSL_TYPE_ARRAY ?
tail_type->array_element : tail_type->members[i];
_vtn_variable_copy(b, new_dest, new_src, elem_type);
}
return;
}
default:
unreachable("Invalid access chain type");
}
}
/* Gets the deref_node for the given deref chain and creates it if it
* doesn't yet exist. If the deref is fully-qualified and direct and
* state->add_to_direct_deref_nodes is true, it will be added to the hash
* table of of fully-qualified direct derefs.
*/
static struct deref_node *
get_deref_node(nir_deref_var *deref, struct lower_variables_state *state)
{
bool is_direct = true;
/* Start at the base of the chain. */
struct deref_node *node = get_deref_node_for_var(deref->var, state);
assert(deref->deref.type == node->type);
for (nir_deref *tail = deref->deref.child; tail; tail = tail->child) {
switch (tail->deref_type) {
case nir_deref_type_struct: {
nir_deref_struct *deref_struct = nir_deref_as_struct(tail);
assert(deref_struct->index < glsl_get_length(node->type));
if (node->children[deref_struct->index] == NULL)
node->children[deref_struct->index] =
deref_node_create(node, tail->type, state->dead_ctx);
node = node->children[deref_struct->index];
break;
}
case nir_deref_type_array: {
nir_deref_array *arr = nir_deref_as_array(tail);
switch (arr->deref_array_type) {
case nir_deref_array_type_direct:
/* This is possible if a loop unrolls and generates an
* out-of-bounds offset. We need to handle this at least
* somewhat gracefully.
*/
if (arr->base_offset >= glsl_get_length(node->type))
return NULL;
if (node->children[arr->base_offset] == NULL)
node->children[arr->base_offset] =
deref_node_create(node, tail->type, state->dead_ctx);
node = node->children[arr->base_offset];
break;
case nir_deref_array_type_indirect:
if (node->indirect == NULL)
node->indirect = deref_node_create(node, tail->type,
state->dead_ctx);
node = node->indirect;
is_direct = false;
break;
case nir_deref_array_type_wildcard:
if (node->wildcard == NULL)
node->wildcard = deref_node_create(node, tail->type,
state->dead_ctx);
node = node->wildcard;
is_direct = false;
break;
default:
unreachable("Invalid array deref type");
}
break;
}
default:
unreachable("Invalid deref type");
}
}
assert(node);
/* Only insert if it isn't already in the list. */
if (is_direct && state->add_to_direct_deref_nodes &&
node->direct_derefs_link.next == NULL) {
node->deref = deref;
assert(deref->var != NULL);
exec_list_push_tail(&state->direct_deref_nodes,
&node->direct_derefs_link);
}
return node;
}
void
vtn_handle_variables(struct vtn_builder *b, SpvOp opcode,
const uint32_t *w, unsigned count)
{
switch (opcode) {
case SpvOpVariable: {
struct vtn_variable *var = rzalloc(b, struct vtn_variable);
var->type = vtn_value(b, w[1], vtn_value_type_type)->type;
var->chain.var = var;
var->chain.length = 0;
struct vtn_value *val =
vtn_push_value(b, w[2], vtn_value_type_access_chain);
val->access_chain = &var->chain;
struct vtn_type *without_array = var->type;
while(glsl_type_is_array(without_array->type))
without_array = without_array->array_element;
nir_variable_mode nir_mode;
switch ((SpvStorageClass)w[3]) {
case SpvStorageClassUniform:
case SpvStorageClassUniformConstant:
if (without_array->block) {
var->mode = vtn_variable_mode_ubo;
b->shader->info.num_ubos++;
} else if (without_array->buffer_block) {
var->mode = vtn_variable_mode_ssbo;
b->shader->info.num_ssbos++;
} else if (glsl_type_is_image(without_array->type)) {
var->mode = vtn_variable_mode_image;
nir_mode = nir_var_uniform;
b->shader->info.num_images++;
} else if (glsl_type_is_sampler(without_array->type)) {
var->mode = vtn_variable_mode_sampler;
nir_mode = nir_var_uniform;
b->shader->info.num_textures++;
} else {
assert(!"Invalid uniform variable type");
}
break;
case SpvStorageClassPushConstant:
var->mode = vtn_variable_mode_push_constant;
assert(b->shader->num_uniforms == 0);
b->shader->num_uniforms = vtn_type_block_size(var->type) * 4;
break;
case SpvStorageClassInput:
var->mode = vtn_variable_mode_input;
nir_mode = nir_var_shader_in;
break;
case SpvStorageClassOutput:
var->mode = vtn_variable_mode_output;
nir_mode = nir_var_shader_out;
break;
case SpvStorageClassPrivate:
var->mode = vtn_variable_mode_global;
nir_mode = nir_var_global;
break;
case SpvStorageClassFunction:
var->mode = vtn_variable_mode_local;
nir_mode = nir_var_local;
break;
case SpvStorageClassWorkgroup:
var->mode = vtn_variable_mode_workgroup;
nir_mode = nir_var_shared;
break;
case SpvStorageClassCrossWorkgroup:
case SpvStorageClassGeneric:
case SpvStorageClassAtomicCounter:
default:
unreachable("Unhandled variable storage class");
}
switch (var->mode) {
case vtn_variable_mode_local:
case vtn_variable_mode_global:
case vtn_variable_mode_image:
case vtn_variable_mode_sampler:
case vtn_variable_mode_workgroup:
/* For these, we create the variable normally */
var->var = rzalloc(b->shader, nir_variable);
var->var->name = ralloc_strdup(var->var, val->name);
var->var->type = var->type->type;
var->var->data.mode = nir_mode;
switch (var->mode) {
case vtn_variable_mode_image:
case vtn_variable_mode_sampler:
var->var->interface_type = without_array->type;
break;
default:
var->var->interface_type = NULL;
break;
}
break;
case vtn_variable_mode_input:
case vtn_variable_mode_output: {
/* For inputs and outputs, we immediately split structures. This
* is for a couple of reasons. For one, builtins may all come in
* a struct and we really want those split out into separate
* variables. For another, interpolation qualifiers can be
* applied to members of the top-level struct ane we need to be
* able to preserve that information.
*/
int array_length = -1;
struct vtn_type *interface_type = var->type;
if (b->shader->stage == MESA_SHADER_GEOMETRY &&
glsl_type_is_array(var->type->type)) {
/* In Geometry shaders (and some tessellation), inputs come
* in per-vertex arrays. However, some builtins come in
* non-per-vertex, hence the need for the is_array check. In
* any case, there are no non-builtin arrays allowed so this
* check should be sufficient.
*/
interface_type = var->type->array_element;
array_length = glsl_get_length(var->type->type);
}
if (glsl_type_is_struct(interface_type->type)) {
/* It's a struct. Split it. */
unsigned num_members = glsl_get_length(interface_type->type);
var->members = ralloc_array(b, nir_variable *, num_members);
for (unsigned i = 0; i < num_members; i++) {
const struct glsl_type *mtype = interface_type->members[i]->type;
if (array_length >= 0)
mtype = glsl_array_type(mtype, array_length);
var->members[i] = rzalloc(b->shader, nir_variable);
var->members[i]->name =
ralloc_asprintf(var->members[i], "%s.%d", val->name, i);
var->members[i]->type = mtype;
var->members[i]->interface_type =
interface_type->members[i]->type;
var->members[i]->data.mode = nir_mode;
}
} else {
var->var = rzalloc(b->shader, nir_variable);
var->var->name = ralloc_strdup(var->var, val->name);
var->var->type = var->type->type;
var->var->interface_type = interface_type->type;
var->var->data.mode = nir_mode;
}
/* For inputs and outputs, we need to grab locations and builtin
* information from the interface type.
*/
vtn_foreach_decoration(b, interface_type->val, var_decoration_cb, var);
break;
case vtn_variable_mode_param:
unreachable("Not created through OpVariable");
}
case vtn_variable_mode_ubo:
case vtn_variable_mode_ssbo:
case vtn_variable_mode_push_constant:
/* These don't need actual variables. */
break;
}
if (count > 4) {
assert(count == 5);
nir_constant *constant =
vtn_value(b, w[4], vtn_value_type_constant)->constant;
var->var->constant_initializer =
nir_constant_clone(constant, var->var);
}
vtn_foreach_decoration(b, val, var_decoration_cb, var);
if (var->mode == vtn_variable_mode_image ||
var->mode == vtn_variable_mode_sampler) {
/* XXX: We still need the binding information in the nir_variable
* for these. We should fix that.
*/
var->var->data.binding = var->binding;
var->var->data.descriptor_set = var->descriptor_set;
if (var->mode == vtn_variable_mode_image)
var->var->data.image.format = without_array->image_format;
}
if (var->mode == vtn_variable_mode_local) {
assert(var->members == NULL && var->var != NULL);
nir_function_impl_add_variable(b->impl, var->var);
} else if (var->var) {
nir_shader_add_variable(b->shader, var->var);
} else if (var->members) {
unsigned count = glsl_get_length(without_array->type);
for (unsigned i = 0; i < count; i++) {
assert(var->members[i]->data.mode != nir_var_local);
nir_shader_add_variable(b->shader, var->members[i]);
}
} else {
assert(var->mode == vtn_variable_mode_ubo ||
var->mode == vtn_variable_mode_ssbo ||
var->mode == vtn_variable_mode_push_constant);
}
break;
}
static nir_src
get_deref_reg_src(nir_deref_var *deref, nir_instr *instr,
struct locals_to_regs_state *state)
{
nir_src src;
src.is_ssa = false;
src.reg.reg = get_reg_for_deref(deref, state);
src.reg.base_offset = 0;
src.reg.indirect = NULL;
/* It is possible for a user to create a shader that has an array with a
* single element and then proceed to access it indirectly. Indirectly
* accessing a non-array register is not allowed in NIR. In order to
* handle this case we just convert it to a direct reference.
*/
if (src.reg.reg->num_array_elems == 0)
return src;
nir_deref *tail = &deref->deref;
while (tail->child != NULL) {
const struct glsl_type *parent_type = tail->type;
tail = tail->child;
if (tail->deref_type != nir_deref_type_array)
continue;
nir_deref_array *deref_array = nir_deref_as_array(tail);
src.reg.base_offset *= glsl_get_length(parent_type);
src.reg.base_offset += deref_array->base_offset;
if (src.reg.indirect) {
nir_load_const_instr *load_const =
nir_load_const_instr_create(state->shader, 1, 32);
load_const->value.u32[0] = glsl_get_length(parent_type);
nir_instr_insert_before(instr, &load_const->instr);
nir_alu_instr *mul = nir_alu_instr_create(state->shader, nir_op_imul);
mul->src[0].src = *src.reg.indirect;
mul->src[1].src.is_ssa = true;
mul->src[1].src.ssa = &load_const->def;
mul->dest.write_mask = 1;
nir_ssa_dest_init(&mul->instr, &mul->dest.dest, 1, 32, NULL);
nir_instr_insert_before(instr, &mul->instr);
src.reg.indirect->is_ssa = true;
src.reg.indirect->ssa = &mul->dest.dest.ssa;
}
if (deref_array->deref_array_type == nir_deref_array_type_indirect) {
if (src.reg.indirect == NULL) {
src.reg.indirect = ralloc(state->shader, nir_src);
nir_src_copy(src.reg.indirect, &deref_array->indirect,
state->shader);
} else {
nir_alu_instr *add = nir_alu_instr_create(state->shader,
nir_op_iadd);
add->src[0].src = *src.reg.indirect;
nir_src_copy(&add->src[1].src, &deref_array->indirect, add);
add->dest.write_mask = 1;
nir_ssa_dest_init(&add->instr, &add->dest.dest, 1, 32, NULL);
nir_instr_insert_before(instr, &add->instr);
src.reg.indirect->is_ssa = true;
src.reg.indirect->ssa = &add->dest.dest.ssa;
}
}
}
return src;
}
/* Recursively constructs deref chains to split a copy instruction into
* multiple (if needed) copy instructions with full-length deref chains.
* External callers of this function should pass the tail and head of the
* deref chains found as the source and destination of the copy instruction
* into this function.
*
* \param old_copy The copy instruction we are splitting
* \param dest_head The head of the destination deref chain we are building
* \param src_head The head of the source deref chain we are building
* \param dest_tail The tail of the destination deref chain we are building
* \param src_tail The tail of the source deref chain we are building
* \param state The current split_var_copies_state object
*/
static void
split_var_copy_instr(nir_intrinsic_instr *old_copy,
nir_deref *dest_head, nir_deref *src_head,
nir_deref *dest_tail, nir_deref *src_tail,
struct split_var_copies_state *state)
{
assert(src_tail->type == dest_tail->type);
/* Make sure these really are the tails of the deref chains */
assert(dest_tail->child == NULL);
assert(src_tail->child == NULL);
switch (glsl_get_base_type(src_tail->type)) {
case GLSL_TYPE_ARRAY: {
/* Make a wildcard dereference */
nir_deref_array *deref = nir_deref_array_create(state->dead_ctx);
deref->deref.type = glsl_get_array_element(src_tail->type);
deref->deref_array_type = nir_deref_array_type_wildcard;
/* Set the tail of both as the newly created wildcard deref. It is
* safe to use the same wildcard in both places because a) we will be
* copying it before we put it in an actual instruction and b)
* everything that will potentially add another link in the deref
* chain will also add the same thing to both chains.
*/
src_tail->child = &deref->deref;
dest_tail->child = &deref->deref;
split_var_copy_instr(old_copy, dest_head, src_head,
dest_tail->child, src_tail->child, state);
/* Set it back to the way we found it */
src_tail->child = NULL;
dest_tail->child = NULL;
break;
}
case GLSL_TYPE_STRUCT:
/* This is the only part that actually does any interesting
* splitting. For array types, we just use wildcards and resolve
* them later. For structure types, we need to emit one copy
* instruction for every structure element. Because we may have
* structs inside structs, we just recurse and let the next level
* take care of any additional structures.
*/
for (unsigned i = 0; i < glsl_get_length(src_tail->type); i++) {
nir_deref_struct *deref = nir_deref_struct_create(state->dead_ctx, i);
deref->deref.type = glsl_get_struct_field(src_tail->type, i);
/* Set the tail of both as the newly created structure deref. It
* is safe to use the same wildcard in both places because a) we
* will be copying it before we put it in an actual instruction
* and b) everything that will potentially add another link in the
* deref chain will also add the same thing to both chains.
*/
src_tail->child = &deref->deref;
dest_tail->child = &deref->deref;
split_var_copy_instr(old_copy, dest_head, src_head,
dest_tail->child, src_tail->child, state);
}
/* Set it back to the way we found it */
src_tail->child = NULL;
dest_tail->child = NULL;
break;
case GLSL_TYPE_UINT:
case GLSL_TYPE_INT:
case GLSL_TYPE_FLOAT:
case GLSL_TYPE_BOOL:
if (glsl_type_is_matrix(src_tail->type)) {
nir_deref_array *deref = nir_deref_array_create(state->dead_ctx);
deref->deref.type = glsl_get_column_type(src_tail->type);
deref->deref_array_type = nir_deref_array_type_wildcard;
/* Set the tail of both as the newly created wildcard deref. It
* is safe to use the same wildcard in both places because a) we
* will be copying it before we put it in an actual instruction
* and b) everything that will potentially add another link in the
* deref chain will also add the same thing to both chains.
*/
src_tail->child = &deref->deref;
dest_tail->child = &deref->deref;
split_var_copy_instr(old_copy, dest_head, src_head,
dest_tail->child, src_tail->child, state);
/* Set it back to the way we found it */
src_tail->child = NULL;
dest_tail->child = NULL;
} else {
/* At this point, we have fully built our deref chains and can
* actually add the new copy instruction.
*/
nir_intrinsic_instr *new_copy =
nir_intrinsic_instr_create(state->mem_ctx, nir_intrinsic_copy_var);
/* We need to make copies because a) this deref chain actually
* belongs to the copy instruction and b) the deref chains may
* have some of the same links due to the way we constructed them
*/
nir_deref *src = nir_copy_deref(new_copy, src_head);
nir_deref *dest = nir_copy_deref(new_copy, dest_head);
new_copy->variables[0] = nir_deref_as_var(dest);
new_copy->variables[1] = nir_deref_as_var(src);
/* Emit the copy instruction after the old instruction. We'll
* remove the old one later.
*/
nir_instr_insert_after(&old_copy->instr, &new_copy->instr);
state->progress = true;
}
break;
case GLSL_TYPE_SAMPLER:
case GLSL_TYPE_IMAGE:
case GLSL_TYPE_ATOMIC_UINT:
case GLSL_TYPE_INTERFACE:
default:
unreachable("Cannot copy these types");
}
}
static void
_vtn_local_load_store(struct vtn_builder *b, bool load, nir_deref_var *deref,
nir_deref *tail, struct vtn_ssa_value *inout)
{
/* The deref tail may contain a deref to select a component of a vector (in
* other words, it might not be an actual tail) so we have to save it away
* here since we overwrite it later.
*/
nir_deref *old_child = tail->child;
if (glsl_type_is_vector_or_scalar(tail->type)) {
/* Terminate the deref chain in case there is one more link to pick
* off a component of the vector.
*/
tail->child = NULL;
nir_intrinsic_op op = load ? nir_intrinsic_load_var :
nir_intrinsic_store_var;
nir_intrinsic_instr *intrin = nir_intrinsic_instr_create(b->shader, op);
intrin->variables[0] =
nir_deref_as_var(nir_copy_deref(intrin, &deref->deref));
intrin->num_components = glsl_get_vector_elements(tail->type);
if (load) {
nir_ssa_dest_init(&intrin->instr, &intrin->dest,
intrin->num_components,
glsl_get_bit_size(glsl_get_base_type(tail->type)),
NULL);
inout->def = &intrin->dest.ssa;
} else {
nir_intrinsic_set_write_mask(intrin, (1 << intrin->num_components) - 1);
intrin->src[0] = nir_src_for_ssa(inout->def);
}
nir_builder_instr_insert(&b->nb, &intrin->instr);
} else if (glsl_get_base_type(tail->type) == GLSL_TYPE_ARRAY ||
glsl_type_is_matrix(tail->type)) {
unsigned elems = glsl_get_length(tail->type);
nir_deref_array *deref_arr = nir_deref_array_create(b);
deref_arr->deref_array_type = nir_deref_array_type_direct;
deref_arr->deref.type = glsl_get_array_element(tail->type);
tail->child = &deref_arr->deref;
for (unsigned i = 0; i < elems; i++) {
deref_arr->base_offset = i;
_vtn_local_load_store(b, load, deref, tail->child, inout->elems[i]);
}
} else {
assert(glsl_get_base_type(tail->type) == GLSL_TYPE_STRUCT);
unsigned elems = glsl_get_length(tail->type);
nir_deref_struct *deref_struct = nir_deref_struct_create(b, 0);
tail->child = &deref_struct->deref;
for (unsigned i = 0; i < elems; i++) {
deref_struct->index = i;
deref_struct->deref.type = glsl_get_struct_field(tail->type, i);
_vtn_local_load_store(b, load, deref, tail->child, inout->elems[i]);
}
}
tail->child = old_child;
}
static void
_vtn_block_load_store(struct vtn_builder *b, nir_intrinsic_op op, bool load,
nir_ssa_def *index, nir_ssa_def *offset,
struct vtn_access_chain *chain, unsigned chain_idx,
struct vtn_type *type, struct vtn_ssa_value **inout)
{
if (chain && chain_idx >= chain->length)
chain = NULL;
if (load && chain == NULL && *inout == NULL)
*inout = vtn_create_ssa_value(b, type->type);
enum glsl_base_type base_type = glsl_get_base_type(type->type);
switch (base_type) {
case GLSL_TYPE_UINT:
case GLSL_TYPE_INT:
case GLSL_TYPE_FLOAT:
case GLSL_TYPE_BOOL:
/* This is where things get interesting. At this point, we've hit
* a vector, a scalar, or a matrix.
*/
if (glsl_type_is_matrix(type->type)) {
if (chain == NULL) {
/* Loading the whole matrix */
struct vtn_ssa_value *transpose;
unsigned num_ops, vec_width;
if (type->row_major) {
num_ops = glsl_get_vector_elements(type->type);
vec_width = glsl_get_matrix_columns(type->type);
if (load) {
const struct glsl_type *transpose_type =
glsl_matrix_type(base_type, vec_width, num_ops);
*inout = vtn_create_ssa_value(b, transpose_type);
} else {
transpose = vtn_ssa_transpose(b, *inout);
inout = &transpose;
}
} else {
num_ops = glsl_get_matrix_columns(type->type);
vec_width = glsl_get_vector_elements(type->type);
}
for (unsigned i = 0; i < num_ops; i++) {
nir_ssa_def *elem_offset =
nir_iadd(&b->nb, offset,
nir_imm_int(&b->nb, i * type->stride));
_vtn_load_store_tail(b, op, load, index, elem_offset,
&(*inout)->elems[i],
glsl_vector_type(base_type, vec_width));
}
if (load && type->row_major)
*inout = vtn_ssa_transpose(b, *inout);
} else if (type->row_major) {
/* Row-major but with an access chiain. */
nir_ssa_def *col_offset =
vtn_access_link_as_ssa(b, chain->link[chain_idx],
type->array_element->stride);
offset = nir_iadd(&b->nb, offset, col_offset);
if (chain_idx + 1 < chain->length) {
/* Picking off a single element */
nir_ssa_def *row_offset =
vtn_access_link_as_ssa(b, chain->link[chain_idx + 1],
type->stride);
offset = nir_iadd(&b->nb, offset, row_offset);
if (load)
*inout = vtn_create_ssa_value(b, glsl_scalar_type(base_type));
_vtn_load_store_tail(b, op, load, index, offset, inout,
glsl_scalar_type(base_type));
} else {
/* Grabbing a column; picking one element off each row */
unsigned num_comps = glsl_get_vector_elements(type->type);
const struct glsl_type *column_type =
glsl_get_column_type(type->type);
nir_ssa_def *comps[4];
for (unsigned i = 0; i < num_comps; i++) {
nir_ssa_def *elem_offset =
nir_iadd(&b->nb, offset,
nir_imm_int(&b->nb, i * type->stride));
struct vtn_ssa_value *comp, temp_val;
if (!load) {
temp_val.def = nir_channel(&b->nb, (*inout)->def, i);
temp_val.type = glsl_scalar_type(base_type);
}
comp = &temp_val;
_vtn_load_store_tail(b, op, load, index, elem_offset,
&comp, glsl_scalar_type(base_type));
comps[i] = comp->def;
}
if (load) {
if (*inout == NULL)
*inout = vtn_create_ssa_value(b, column_type);
(*inout)->def = nir_vec(&b->nb, comps, num_comps);
}
}
} else {
/* Column-major with a deref. Fall through to array case. */
nir_ssa_def *col_offset =
vtn_access_link_as_ssa(b, chain->link[chain_idx], type->stride);
offset = nir_iadd(&b->nb, offset, col_offset);
_vtn_block_load_store(b, op, load, index, offset,
chain, chain_idx + 1,
type->array_element, inout);
}
} else if (chain == NULL) {
/* Single whole vector */
assert(glsl_type_is_vector_or_scalar(type->type));
_vtn_load_store_tail(b, op, load, index, offset, inout, type->type);
} else {
/* Single component of a vector. Fall through to array case. */
nir_ssa_def *elem_offset =
vtn_access_link_as_ssa(b, chain->link[chain_idx], type->stride);
offset = nir_iadd(&b->nb, offset, elem_offset);
_vtn_block_load_store(b, op, load, index, offset, NULL, 0,
type->array_element, inout);
}
return;
case GLSL_TYPE_ARRAY: {
unsigned elems = glsl_get_length(type->type);
for (unsigned i = 0; i < elems; i++) {
nir_ssa_def *elem_off =
nir_iadd(&b->nb, offset, nir_imm_int(&b->nb, i * type->stride));
_vtn_block_load_store(b, op, load, index, elem_off, NULL, 0,
type->array_element, &(*inout)->elems[i]);
}
return;
}
case GLSL_TYPE_STRUCT: {
unsigned elems = glsl_get_length(type->type);
for (unsigned i = 0; i < elems; i++) {
nir_ssa_def *elem_off =
nir_iadd(&b->nb, offset, nir_imm_int(&b->nb, type->offsets[i]));
_vtn_block_load_store(b, op, load, index, elem_off, NULL, 0,
type->members[i], &(*inout)->elems[i]);
}
return;
}
default:
unreachable("Invalid block member type");
}
}
static void
var_decoration_cb(struct vtn_builder *b, struct vtn_value *val, int member,
const struct vtn_decoration *dec, void *void_var)
{
struct vtn_variable *vtn_var = void_var;
/* Handle decorations that apply to a vtn_variable as a whole */
switch (dec->decoration) {
case SpvDecorationNonWritable:
/* Do nothing with this for now */
return;
case SpvDecorationBinding:
vtn_var->binding = dec->literals[0];
return;
case SpvDecorationDescriptorSet:
vtn_var->descriptor_set = dec->literals[0];
return;
case SpvDecorationLocation: {
unsigned location = dec->literals[0];
bool is_vertex_input;
if (b->shader->stage == MESA_SHADER_FRAGMENT &&
vtn_var->mode == vtn_variable_mode_output) {
is_vertex_input = false;
location += FRAG_RESULT_DATA0;
} else if (b->shader->stage == MESA_SHADER_VERTEX &&
vtn_var->mode == vtn_variable_mode_input) {
is_vertex_input = true;
location += VERT_ATTRIB_GENERIC0;
} else if (vtn_var->mode == vtn_variable_mode_input ||
vtn_var->mode == vtn_variable_mode_output) {
is_vertex_input = false;
location += VARYING_SLOT_VAR0;
} else {
assert(!"Location must be on input or output variable");
}
if (vtn_var->var) {
vtn_var->var->data.location = location;
vtn_var->var->data.explicit_location = true;
} else {
assert(vtn_var->members);
unsigned length =
glsl_get_length(glsl_without_array(vtn_var->type->type));
for (unsigned i = 0; i < length; i++) {
vtn_var->members[i]->data.location = location;
vtn_var->members[i]->data.explicit_location = true;
location +=
glsl_count_attribute_slots(vtn_var->members[i]->interface_type,
is_vertex_input);
}
}
return;
}
default:
break;
}
/* Now we handle decorations that apply to a particular nir_variable */
nir_variable *nir_var = vtn_var->var;
if (val->value_type == vtn_value_type_access_chain) {
assert(val->access_chain->length == 0);
assert(val->access_chain->var == void_var);
assert(member == -1);
} else {
assert(val->value_type == vtn_value_type_type);
if (member != -1)
nir_var = vtn_var->members[member];
}
if (nir_var == NULL)
return;
switch (dec->decoration) {
case SpvDecorationRelaxedPrecision:
break; /* FIXME: Do nothing with this for now. */
case SpvDecorationNoPerspective:
nir_var->data.interpolation = INTERP_QUALIFIER_NOPERSPECTIVE;
break;
case SpvDecorationFlat:
nir_var->data.interpolation = INTERP_QUALIFIER_FLAT;
break;
case SpvDecorationCentroid:
nir_var->data.centroid = true;
break;
case SpvDecorationSample:
nir_var->data.sample = true;
break;
case SpvDecorationInvariant:
nir_var->data.invariant = true;
break;
case SpvDecorationConstant:
assert(nir_var->constant_initializer != NULL);
nir_var->data.read_only = true;
break;
case SpvDecorationNonWritable:
nir_var->data.read_only = true;
break;
case SpvDecorationComponent:
nir_var->data.location_frac = dec->literals[0];
break;
case SpvDecorationIndex:
nir_var->data.explicit_index = true;
nir_var->data.index = dec->literals[0];
break;
case SpvDecorationBuiltIn: {
SpvBuiltIn builtin = dec->literals[0];
if (builtin == SpvBuiltInWorkgroupSize) {
/* This shouldn't be a builtin. It's actually a constant. */
nir_var->data.mode = nir_var_global;
nir_var->data.read_only = true;
nir_constant *c = rzalloc(nir_var, nir_constant);
c->value.u[0] = b->shader->info.cs.local_size[0];
c->value.u[1] = b->shader->info.cs.local_size[1];
c->value.u[2] = b->shader->info.cs.local_size[2];
nir_var->constant_initializer = c;
break;
}
nir_variable_mode mode = nir_var->data.mode;
vtn_get_builtin_location(b, builtin, &nir_var->data.location, &mode);
nir_var->data.explicit_location = true;
nir_var->data.mode = mode;
if (builtin == SpvBuiltInFragCoord || builtin == SpvBuiltInSamplePosition)
nir_var->data.origin_upper_left = b->origin_upper_left;
break;
}
case SpvDecorationRowMajor:
case SpvDecorationColMajor:
case SpvDecorationGLSLShared:
case SpvDecorationPatch:
case SpvDecorationRestrict:
case SpvDecorationAliased:
case SpvDecorationVolatile:
case SpvDecorationCoherent:
case SpvDecorationNonReadable:
case SpvDecorationUniform:
/* This is really nice but we have no use for it right now. */
case SpvDecorationCPacked:
case SpvDecorationSaturatedConversion:
case SpvDecorationStream:
case SpvDecorationOffset:
case SpvDecorationXfbBuffer:
case SpvDecorationFuncParamAttr:
case SpvDecorationFPRoundingMode:
case SpvDecorationFPFastMathMode:
case SpvDecorationLinkageAttributes:
case SpvDecorationSpecId:
break;
default:
unreachable("Unhandled variable decoration");
}
}
/* This function recursively walks the given deref chain and replaces the
* given copy instruction with an equivalent sequence load/store
* operations.
*
* @copy_instr The copy instruction to replace; new instructions will be
* inserted before this one
*
* @dest_head The head of the destination variable deref chain
*
* @src_head The head of the source variable deref chain
*
* @dest_tail The current tail of the destination variable deref chain;
* this is used for recursion and external callers of this
* function should call it with tail == head
*
* @src_tail The current tail of the source variable deref chain;
* this is used for recursion and external callers of this
* function should call it with tail == head
*
* @state The current variable lowering state
*/
static void
emit_copy_load_store(nir_intrinsic_instr *copy_instr,
nir_deref_var *dest_head, nir_deref_var *src_head,
nir_deref *dest_tail, nir_deref *src_tail, void *mem_ctx)
{
/* Find the next pair of wildcards */
nir_deref *src_arr_parent = deref_next_wildcard_parent(src_tail);
nir_deref *dest_arr_parent = deref_next_wildcard_parent(dest_tail);
if (src_arr_parent || dest_arr_parent) {
/* Wildcards had better come in matched pairs */
assert(dest_arr_parent && dest_arr_parent);
nir_deref_array *src_arr = nir_deref_as_array(src_arr_parent->child);
nir_deref_array *dest_arr = nir_deref_as_array(dest_arr_parent->child);
unsigned length = glsl_get_length(src_arr_parent->type);
/* The wildcards should represent the same number of elements */
assert(length == glsl_get_length(dest_arr_parent->type));
assert(length > 0);
/* Walk over all of the elements that this wildcard refers to and
* call emit_copy_load_store on each one of them */
src_arr->deref_array_type = nir_deref_array_type_direct;
dest_arr->deref_array_type = nir_deref_array_type_direct;
for (unsigned i = 0; i < length; i++) {
src_arr->base_offset = i;
dest_arr->base_offset = i;
emit_copy_load_store(copy_instr, dest_head, src_head,
&dest_arr->deref, &src_arr->deref, mem_ctx);
}
src_arr->deref_array_type = nir_deref_array_type_wildcard;
dest_arr->deref_array_type = nir_deref_array_type_wildcard;
} else {
/* In this case, we have no wildcards anymore, so all we have to do
* is just emit the load and store operations. */
src_tail = nir_deref_tail(src_tail);
dest_tail = nir_deref_tail(dest_tail);
assert(src_tail->type == dest_tail->type);
unsigned num_components = glsl_get_vector_elements(src_tail->type);
nir_intrinsic_instr *load =
nir_intrinsic_instr_create(mem_ctx, nir_intrinsic_load_var);
load->num_components = num_components;
load->variables[0] = nir_deref_as_var(nir_copy_deref(load, &src_head->deref));
nir_ssa_dest_init(&load->instr, &load->dest, num_components, NULL);
nir_instr_insert_before(©_instr->instr, &load->instr);
nir_intrinsic_instr *store =
nir_intrinsic_instr_create(mem_ctx, nir_intrinsic_store_var);
store->num_components = num_components;
store->const_index[0] = (1 << num_components) - 1;
store->variables[0] = nir_deref_as_var(nir_copy_deref(store, &dest_head->deref));
store->src[0].is_ssa = true;
store->src[0].ssa = &load->dest.ssa;
nir_instr_insert_before(©_instr->instr, &store->instr);
}
}
static void
lower_sampler(nir_tex_instr *instr, struct gl_shader_program *shader_program,
const struct gl_program *prog, void *mem_ctx)
{
if (instr->sampler == NULL)
return;
/* Get the name and the offset */
instr->sampler_index = 0;
bool has_indirect = false;
char *name = ralloc_strdup(mem_ctx, instr->sampler->var->name);
for (nir_deref *deref = &instr->sampler->deref;
deref->child; deref = deref->child) {
switch (deref->child->deref_type) {
case nir_deref_type_array: {
nir_deref_array *deref_array = nir_deref_as_array(deref->child);
/* XXX: We're assuming here that the indirect is the last array
* thing we have. This should be ok for now as we don't support
* arrays_of_arrays yet.
*/
assert(!has_indirect);
instr->sampler_index *= glsl_get_length(deref->type);
switch (deref_array->deref_array_type) {
case nir_deref_array_type_direct:
instr->sampler_index += deref_array->base_offset;
if (deref_array->deref.child)
ralloc_asprintf_append(&name, "[%u]", deref_array->base_offset);
break;
case nir_deref_array_type_indirect: {
assert(!has_indirect);
instr->src = reralloc(mem_ctx, instr->src, nir_tex_src,
instr->num_srcs + 1);
memset(&instr->src[instr->num_srcs], 0, sizeof *instr->src);
instr->src[instr->num_srcs].src_type = nir_tex_src_sampler_offset;
instr->num_srcs++;
nir_instr_rewrite_src(&instr->instr,
&instr->src[instr->num_srcs - 1].src,
deref_array->indirect);
instr->sampler_array_size = glsl_get_length(deref->type);
nir_src empty;
memset(&empty, 0, sizeof empty);
nir_instr_rewrite_src(&instr->instr, &deref_array->indirect, empty);
if (deref_array->deref.child)
ralloc_strcat(&name, "[0]");
break;
}
case nir_deref_array_type_wildcard:
unreachable("Cannot copy samplers");
default:
unreachable("Invalid deref array type");
}
break;
}
case nir_deref_type_struct: {
nir_deref_struct *deref_struct = nir_deref_as_struct(deref->child);
const char *field = glsl_get_struct_elem_name(deref->type,
deref_struct->index);
ralloc_asprintf_append(&name, ".%s", field);
break;
}
default:
unreachable("Invalid deref type");
break;
}
}
instr->sampler_index += get_sampler_index(shader_program, name, prog);
instr->sampler = NULL;
}