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mesa/src/glsl/lower_ubo_reference.cpp
Samuel Iglesias Gonsalvez f42466322a glsl: emit row_major matrix's SSBO stores only for components in writemask 
When writing to a column of a row-major matrix, each component of the
vector is stored to non-consecutive memory addresses, so we generate
one instruction per component.

This patch skips the disabled components in the writemask, saving some
store instructions plus avoid storing wrong data on each disabled
component.

Signed-off-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
2015-10-02 08:34:25 +02:00

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/*
* Copyright © 2012 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
/**
* \file lower_ubo_reference.cpp
*
* IR lower pass to replace dereferences of variables in a uniform
* buffer object with usage of ir_binop_ubo_load expressions, each of
* which can read data up to the size of a vec4.
*
* This relieves drivers of the responsibility to deal with tricky UBO
* layout issues like std140 structures and row_major matrices on
* their own.
*/
#include "ir.h"
#include "ir_builder.h"
#include "ir_rvalue_visitor.h"
#include "main/macros.h"
#include "glsl_parser_extras.h"
using namespace ir_builder;
/**
* Determine if a thing being dereferenced is row-major
*
* There is some trickery here.
*
* If the thing being dereferenced is a member of uniform block \b without an
* instance name, then the name of the \c ir_variable is the field name of an
* interface type. If this field is row-major, then the thing referenced is
* row-major.
*
* If the thing being dereferenced is a member of uniform block \b with an
* instance name, then the last dereference in the tree will be an
* \c ir_dereference_record. If that record field is row-major, then the
* thing referenced is row-major.
*/
static bool
is_dereferenced_thing_row_major(const ir_rvalue *deref)
{
bool matrix = false;
const ir_rvalue *ir = deref;
while (true) {
matrix = matrix || ir->type->without_array()->is_matrix();
switch (ir->ir_type) {
case ir_type_dereference_array: {
const ir_dereference_array *const array_deref =
(const ir_dereference_array *) ir;
ir = array_deref->array;
break;
}
case ir_type_dereference_record: {
const ir_dereference_record *const record_deref =
(const ir_dereference_record *) ir;
ir = record_deref->record;
const int idx = ir->type->field_index(record_deref->field);
assert(idx >= 0);
const enum glsl_matrix_layout matrix_layout =
glsl_matrix_layout(ir->type->fields.structure[idx].matrix_layout);
switch (matrix_layout) {
case GLSL_MATRIX_LAYOUT_INHERITED:
break;
case GLSL_MATRIX_LAYOUT_COLUMN_MAJOR:
return false;
case GLSL_MATRIX_LAYOUT_ROW_MAJOR:
return matrix || deref->type->without_array()->is_record();
}
break;
}
case ir_type_dereference_variable: {
const ir_dereference_variable *const var_deref =
(const ir_dereference_variable *) ir;
const enum glsl_matrix_layout matrix_layout =
glsl_matrix_layout(var_deref->var->data.matrix_layout);
switch (matrix_layout) {
case GLSL_MATRIX_LAYOUT_INHERITED:
assert(!matrix);
return false;
case GLSL_MATRIX_LAYOUT_COLUMN_MAJOR:
return false;
case GLSL_MATRIX_LAYOUT_ROW_MAJOR:
return matrix || deref->type->without_array()->is_record();
}
unreachable("invalid matrix layout");
break;
}
default:
return false;
}
}
/* The tree must have ended with a dereference that wasn't an
* ir_dereference_variable. That is invalid, and it should be impossible.
*/
unreachable("invalid dereference tree");
return false;
}
namespace {
class lower_ubo_reference_visitor : public ir_rvalue_enter_visitor {
public:
lower_ubo_reference_visitor(struct gl_shader *shader)
: shader(shader)
{
}
void handle_rvalue(ir_rvalue **rvalue);
ir_visitor_status visit_enter(ir_assignment *ir);
void setup_for_load_or_store(ir_variable *var,
ir_rvalue *deref,
ir_rvalue **offset,
unsigned *const_offset,
bool *row_major,
int *matrix_columns,
unsigned packing);
ir_expression *ubo_load(const struct glsl_type *type,
ir_rvalue *offset);
ir_call *ssbo_load(const struct glsl_type *type,
ir_rvalue *offset);
void check_for_ssbo_store(ir_assignment *ir);
void write_to_memory(ir_dereference *deref,
ir_variable *var,
ir_variable *write_var,
unsigned write_mask);
ir_call *ssbo_store(ir_rvalue *deref, ir_rvalue *offset,
unsigned write_mask);
void emit_access(bool is_write, ir_dereference *deref,
ir_variable *base_offset, unsigned int deref_offset,
bool row_major, int matrix_columns,
unsigned packing, unsigned write_mask);
ir_visitor_status visit_enter(class ir_expression *);
ir_expression *calculate_ssbo_unsized_array_length(ir_expression *expr);
void check_ssbo_unsized_array_length_expression(class ir_expression *);
void check_ssbo_unsized_array_length_assignment(ir_assignment *ir);
ir_expression *process_ssbo_unsized_array_length(ir_rvalue **,
ir_dereference *,
ir_variable *);
ir_expression *emit_ssbo_get_buffer_size();
unsigned calculate_unsized_array_stride(ir_dereference *deref,
unsigned packing);
ir_call *lower_ssbo_atomic_intrinsic(ir_call *ir);
ir_call *check_for_ssbo_atomic_intrinsic(ir_call *ir);
ir_visitor_status visit_enter(ir_call *ir);
void *mem_ctx;
struct gl_shader *shader;
struct gl_uniform_buffer_variable *ubo_var;
ir_rvalue *uniform_block;
bool progress;
bool is_shader_storage;
};
/**
* Determine the name of the interface block field
*
* This is the name of the specific member as it would appear in the
* \c gl_uniform_buffer_variable::Name field in the shader's
* \c UniformBlocks array.
*/
static const char *
interface_field_name(void *mem_ctx, char *base_name, ir_rvalue *d,
ir_rvalue **nonconst_block_index)
{
ir_rvalue *previous_index = NULL;
*nonconst_block_index = NULL;
while (d != NULL) {
switch (d->ir_type) {
case ir_type_dereference_variable: {
ir_dereference_variable *v = (ir_dereference_variable *) d;
if (previous_index
&& v->var->is_interface_instance()
&& v->var->type->is_array()) {
ir_constant *const_index = previous_index->as_constant();
if (!const_index) {
*nonconst_block_index = previous_index;
return ralloc_asprintf(mem_ctx, "%s[0]", base_name);
} else {
return ralloc_asprintf(mem_ctx,
"%s[%d]",
base_name,
const_index->get_uint_component(0));
}
} else {
return base_name;
}
break;
}
case ir_type_dereference_record: {
ir_dereference_record *r = (ir_dereference_record *) d;
d = r->record->as_dereference();
break;
}
case ir_type_dereference_array: {
ir_dereference_array *a = (ir_dereference_array *) d;
d = a->array->as_dereference();
previous_index = a->array_index;
break;
}
case ir_type_swizzle: {
ir_swizzle *s = (ir_swizzle *) d;
d = s->val->as_dereference();
break;
}
default:
assert(!"Should not get here.");
break;
}
}
assert(!"Should not get here.");
return NULL;
}
void
lower_ubo_reference_visitor::setup_for_load_or_store(ir_variable *var,
ir_rvalue *deref,
ir_rvalue **offset,
unsigned *const_offset,
bool *row_major,
int *matrix_columns,
unsigned packing)
{
/* Determine the name of the interface block */
ir_rvalue *nonconst_block_index;
const char *const field_name =
interface_field_name(mem_ctx, (char *) var->get_interface_type()->name,
deref, &nonconst_block_index);
/* Locate the ubo block by interface name */
this->uniform_block = NULL;
for (unsigned i = 0; i < shader->NumUniformBlocks; i++) {
if (strcmp(field_name, shader->UniformBlocks[i].Name) == 0) {
ir_constant *index = new(mem_ctx) ir_constant(i);
if (nonconst_block_index) {
if (nonconst_block_index->type != glsl_type::uint_type)
nonconst_block_index = i2u(nonconst_block_index);
this->uniform_block = add(nonconst_block_index, index);
} else {
this->uniform_block = index;
}
this->is_shader_storage = shader->UniformBlocks[i].IsShaderStorage;
struct gl_uniform_block *block = &shader->UniformBlocks[i];
this->ubo_var = var->is_interface_instance()
? &block->Uniforms[0] : &block->Uniforms[var->data.location];
break;
}
}
assert(this->uniform_block);
*offset = new(mem_ctx) ir_constant(0u);
*const_offset = 0;
*row_major = is_dereferenced_thing_row_major(deref);
*matrix_columns = 1;
/* Calculate the offset to the start of the region of the UBO
* dereferenced by *rvalue. This may be a variable offset if an
* array dereference has a variable index.
*/
while (deref) {
switch (deref->ir_type) {
case ir_type_dereference_variable: {
*const_offset += ubo_var->Offset;
deref = NULL;
break;
}
case ir_type_dereference_array: {
ir_dereference_array *deref_array = (ir_dereference_array *) deref;
unsigned array_stride;
if (deref_array->array->type->is_matrix() && *row_major) {
/* When loading a vector out of a row major matrix, the
* step between the columns (vectors) is the size of a
* float, while the step between the rows (elements of a
* vector) is handled below in emit_ubo_loads.
*/
array_stride = 4;
if (deref_array->array->type->is_double())
array_stride *= 2;
*matrix_columns = deref_array->array->type->matrix_columns;
} else if (deref_array->type->is_interface()) {
/* We're processing an array dereference of an interface instance
* array. The thing being dereferenced *must* be a variable
* dereference because interfaces cannot be embedded in other
* types. In terms of calculating the offsets for the lowering
* pass, we don't care about the array index. All elements of an
* interface instance array will have the same offsets relative to
* the base of the block that backs them.
*/
assert(deref_array->array->as_dereference_variable());
deref = deref_array->array->as_dereference();
break;
} else {
/* Whether or not the field is row-major (because it might be a
* bvec2 or something) does not affect the array itself. We need
* to know whether an array element in its entirety is row-major.
*/
const bool array_row_major =
is_dereferenced_thing_row_major(deref_array);
/* The array type will give the correct interface packing
* information
*/
if (packing == GLSL_INTERFACE_PACKING_STD430) {
array_stride = deref_array->type->std430_array_stride(array_row_major);
} else {
array_stride = deref_array->type->std140_size(array_row_major);
array_stride = glsl_align(array_stride, 16);
}
}
ir_rvalue *array_index = deref_array->array_index;
if (array_index->type->base_type == GLSL_TYPE_INT)
array_index = i2u(array_index);
ir_constant *const_index =
array_index->constant_expression_value(NULL);
if (const_index) {
*const_offset += array_stride * const_index->value.u[0];
} else {
*offset = add(*offset,
mul(array_index,
new(mem_ctx) ir_constant(array_stride)));
}
deref = deref_array->array->as_dereference();
break;
}
case ir_type_dereference_record: {
ir_dereference_record *deref_record = (ir_dereference_record *) deref;
const glsl_type *struct_type = deref_record->record->type;
unsigned intra_struct_offset = 0;
for (unsigned int i = 0; i < struct_type->length; i++) {
const glsl_type *type = struct_type->fields.structure[i].type;
ir_dereference_record *field_deref = new(mem_ctx)
ir_dereference_record(deref_record->record,
struct_type->fields.structure[i].name);
const bool field_row_major =
is_dereferenced_thing_row_major(field_deref);
ralloc_free(field_deref);
unsigned field_align = 0;
if (packing == GLSL_INTERFACE_PACKING_STD430)
field_align = type->std430_base_alignment(field_row_major);
else
field_align = type->std140_base_alignment(field_row_major);
intra_struct_offset = glsl_align(intra_struct_offset, field_align);
if (strcmp(struct_type->fields.structure[i].name,
deref_record->field) == 0)
break;
if (packing == GLSL_INTERFACE_PACKING_STD430)
intra_struct_offset += type->std430_size(field_row_major);
else
intra_struct_offset += type->std140_size(field_row_major);
/* If the field just examined was itself a structure, apply rule
* #9:
*
* "The structure may have padding at the end; the base offset
* of the member following the sub-structure is rounded up to
* the next multiple of the base alignment of the structure."
*/
if (type->without_array()->is_record()) {
intra_struct_offset = glsl_align(intra_struct_offset,
field_align);
}
}
*const_offset += intra_struct_offset;
deref = deref_record->record->as_dereference();
break;
}
case ir_type_swizzle: {
ir_swizzle *deref_swizzle = (ir_swizzle *) deref;
assert(deref_swizzle->mask.num_components == 1);
*const_offset += deref_swizzle->mask.x * sizeof(int);
deref = deref_swizzle->val->as_dereference();
break;
}
default:
assert(!"not reached");
deref = NULL;
break;
}
}
}
void
lower_ubo_reference_visitor::handle_rvalue(ir_rvalue **rvalue)
{
if (!*rvalue)
return;
ir_dereference *deref = (*rvalue)->as_dereference();
if (!deref)
return;
ir_variable *var = deref->variable_referenced();
if (!var || !var->is_in_buffer_block())
return;
mem_ctx = ralloc_parent(shader->ir);
ir_rvalue *offset = NULL;
unsigned const_offset;
bool row_major;
int matrix_columns;
unsigned packing = var->get_interface_type()->interface_packing;
/* Compute the offset to the start if the dereference as well as other
* information we need to configure the write
*/
setup_for_load_or_store(var, deref,
&offset, &const_offset,
&row_major, &matrix_columns,
packing);
assert(offset);
/* Now that we've calculated the offset to the start of the
* dereference, walk over the type and emit loads into a temporary.
*/
const glsl_type *type = (*rvalue)->type;
ir_variable *load_var = new(mem_ctx) ir_variable(type,
"ubo_load_temp",
ir_var_temporary);
base_ir->insert_before(load_var);
ir_variable *load_offset = new(mem_ctx) ir_variable(glsl_type::uint_type,
"ubo_load_temp_offset",
ir_var_temporary);
base_ir->insert_before(load_offset);
base_ir->insert_before(assign(load_offset, offset));
deref = new(mem_ctx) ir_dereference_variable(load_var);
emit_access(false, deref, load_offset, const_offset,
row_major, matrix_columns, packing, 0);
*rvalue = deref;
progress = true;
}
ir_expression *
lower_ubo_reference_visitor::ubo_load(const glsl_type *type,
ir_rvalue *offset)
{
ir_rvalue *block_ref = this->uniform_block->clone(mem_ctx, NULL);
return new(mem_ctx)
ir_expression(ir_binop_ubo_load,
type,
block_ref,
offset);
}
static bool
shader_storage_buffer_object(const _mesa_glsl_parse_state *state)
{
return state->ARB_shader_storage_buffer_object_enable;
}
ir_call *
lower_ubo_reference_visitor::ssbo_store(ir_rvalue *deref,
ir_rvalue *offset,
unsigned write_mask)
{
exec_list sig_params;
ir_variable *block_ref = new(mem_ctx)
ir_variable(glsl_type::uint_type, "block_ref" , ir_var_function_in);
sig_params.push_tail(block_ref);
ir_variable *offset_ref = new(mem_ctx)
ir_variable(glsl_type::uint_type, "offset" , ir_var_function_in);
sig_params.push_tail(offset_ref);
ir_variable *val_ref = new(mem_ctx)
ir_variable(deref->type, "value" , ir_var_function_in);
sig_params.push_tail(val_ref);
ir_variable *writemask_ref = new(mem_ctx)
ir_variable(glsl_type::uint_type, "write_mask" , ir_var_function_in);
sig_params.push_tail(writemask_ref);
ir_function_signature *sig = new(mem_ctx)
ir_function_signature(glsl_type::void_type, shader_storage_buffer_object);
assert(sig);
sig->replace_parameters(&sig_params);
sig->is_intrinsic = true;
ir_function *f = new(mem_ctx) ir_function("__intrinsic_store_ssbo");
f->add_signature(sig);
exec_list call_params;
call_params.push_tail(this->uniform_block->clone(mem_ctx, NULL));
call_params.push_tail(offset->clone(mem_ctx, NULL));
call_params.push_tail(deref->clone(mem_ctx, NULL));
call_params.push_tail(new(mem_ctx) ir_constant(write_mask));
return new(mem_ctx) ir_call(sig, NULL, &call_params);
}
ir_call *
lower_ubo_reference_visitor::ssbo_load(const struct glsl_type *type,
ir_rvalue *offset)
{
exec_list sig_params;
ir_variable *block_ref = new(mem_ctx)
ir_variable(glsl_type::uint_type, "block_ref" , ir_var_function_in);
sig_params.push_tail(block_ref);
ir_variable *offset_ref = new(mem_ctx)
ir_variable(glsl_type::uint_type, "offset_ref" , ir_var_function_in);
sig_params.push_tail(offset_ref);
ir_function_signature *sig =
new(mem_ctx) ir_function_signature(type, shader_storage_buffer_object);
assert(sig);
sig->replace_parameters(&sig_params);
sig->is_intrinsic = true;
ir_function *f = new(mem_ctx) ir_function("__intrinsic_load_ssbo");
f->add_signature(sig);
ir_variable *result = new(mem_ctx)
ir_variable(type, "ssbo_load_result", ir_var_temporary);
base_ir->insert_before(result);
ir_dereference_variable *deref_result = new(mem_ctx)
ir_dereference_variable(result);
exec_list call_params;
call_params.push_tail(this->uniform_block->clone(mem_ctx, NULL));
call_params.push_tail(offset->clone(mem_ctx, NULL));
return new(mem_ctx) ir_call(sig, deref_result, &call_params);
}
static inline int
writemask_for_size(unsigned n)
{
return ((1 << n) - 1);
}
/**
* Takes a deref and recursively calls itself to break the deref down to the
* point that the reads or writes generated are contiguous scalars or vectors.
*/
void
lower_ubo_reference_visitor::emit_access(bool is_write,
ir_dereference *deref,
ir_variable *base_offset,
unsigned int deref_offset,
bool row_major,
int matrix_columns,
unsigned packing,
unsigned write_mask)
{
if (deref->type->is_record()) {
unsigned int field_offset = 0;
for (unsigned i = 0; i < deref->type->length; i++) {
const struct glsl_struct_field *field =
&deref->type->fields.structure[i];
ir_dereference *field_deref =
new(mem_ctx) ir_dereference_record(deref->clone(mem_ctx, NULL),
field->name);
field_offset =
glsl_align(field_offset,
field->type->std140_base_alignment(row_major));
emit_access(is_write, field_deref, base_offset,
deref_offset + field_offset,
row_major, 1, packing,
writemask_for_size(field_deref->type->vector_elements));
field_offset += field->type->std140_size(row_major);
}
return;
}
if (deref->type->is_array()) {
unsigned array_stride = packing == GLSL_INTERFACE_PACKING_STD430 ?
deref->type->fields.array->std430_array_stride(row_major) :
glsl_align(deref->type->fields.array->std140_size(row_major), 16);
for (unsigned i = 0; i < deref->type->length; i++) {
ir_constant *element = new(mem_ctx) ir_constant(i);
ir_dereference *element_deref =
new(mem_ctx) ir_dereference_array(deref->clone(mem_ctx, NULL),
element);
emit_access(is_write, element_deref, base_offset,
deref_offset + i * array_stride,
row_major, 1, packing,
writemask_for_size(element_deref->type->vector_elements));
}
return;
}
if (deref->type->is_matrix()) {
for (unsigned i = 0; i < deref->type->matrix_columns; i++) {
ir_constant *col = new(mem_ctx) ir_constant(i);
ir_dereference *col_deref =
new(mem_ctx) ir_dereference_array(deref->clone(mem_ctx, NULL), col);
if (row_major) {
/* For a row-major matrix, the next column starts at the next
* element.
*/
int size_mul = deref->type->is_double() ? 8 : 4;
emit_access(is_write, col_deref, base_offset,
deref_offset + i * size_mul,
row_major, deref->type->matrix_columns, packing,
writemask_for_size(col_deref->type->vector_elements));
} else {
int size_mul;
/* std430 doesn't round up vec2 size to a vec4 size */
if (packing == GLSL_INTERFACE_PACKING_STD430 &&
deref->type->vector_elements == 2 &&
!deref->type->is_double()) {
size_mul = 8;
} else {
/* std140 always rounds the stride of arrays (and matrices) to a
* vec4, so matrices are always 16 between columns/rows. With
* doubles, they will be 32 apart when there are more than 2 rows.
*
* For both std140 and std430, if the member is a
* three-'component vector with components consuming N basic
* machine units, the base alignment is 4N. For vec4, base
* alignment is 4N.
*/
size_mul = (deref->type->is_double() &&
deref->type->vector_elements > 2) ? 32 : 16;
}
emit_access(is_write, col_deref, base_offset,
deref_offset + i * size_mul,
row_major, deref->type->matrix_columns, packing,
writemask_for_size(col_deref->type->vector_elements));
}
}
return;
}
assert(deref->type->is_scalar() || deref->type->is_vector());
if (!row_major) {
ir_rvalue *offset =
add(base_offset, new(mem_ctx) ir_constant(deref_offset));
if (is_write)
base_ir->insert_after(ssbo_store(deref, offset, write_mask));
else {
if (!this->is_shader_storage) {
base_ir->insert_before(assign(deref->clone(mem_ctx, NULL),
ubo_load(deref->type, offset)));
} else {
ir_call *load_ssbo = ssbo_load(deref->type, offset);
base_ir->insert_before(load_ssbo);
ir_rvalue *value = load_ssbo->return_deref->as_rvalue()->clone(mem_ctx, NULL);
base_ir->insert_before(assign(deref->clone(mem_ctx, NULL), value));
}
}
} else {
unsigned N = deref->type->is_double() ? 8 : 4;
/* We're dereffing a column out of a row-major matrix, so we
* gather the vector from each stored row.
*/
assert(deref->type->base_type == GLSL_TYPE_FLOAT ||
deref->type->base_type == GLSL_TYPE_DOUBLE);
/* Matrices, row_major or not, are stored as if they were
* arrays of vectors of the appropriate size in std140.
* Arrays have their strides rounded up to a vec4, so the
* matrix stride is always 16. However a double matrix may either be 16
* or 32 depending on the number of columns.
*/
assert(matrix_columns <= 4);
unsigned matrix_stride = glsl_align(matrix_columns * N, 16);
const glsl_type *deref_type = deref->type->base_type == GLSL_TYPE_FLOAT ?
glsl_type::float_type : glsl_type::double_type;
for (unsigned i = 0; i < deref->type->vector_elements; i++) {
ir_rvalue *chan_offset =
add(base_offset,
new(mem_ctx) ir_constant(deref_offset + i * matrix_stride));
if (is_write) {
/* If the component is not in the writemask, then don't
* store any value.
*/
if (!((1 << i) & write_mask))
continue;
base_ir->insert_after(ssbo_store(swizzle(deref, i, 1), chan_offset, 1));
} else {
if (!this->is_shader_storage) {
base_ir->insert_before(assign(deref->clone(mem_ctx, NULL),
ubo_load(deref_type, chan_offset),
(1U << i)));
} else {
ir_call *load_ssbo = ssbo_load(deref_type, chan_offset);
base_ir->insert_before(load_ssbo);
ir_rvalue *value = load_ssbo->return_deref->as_rvalue()->clone(mem_ctx, NULL);
base_ir->insert_before(assign(deref->clone(mem_ctx, NULL),
value,
(1U << i)));
}
}
}
}
}
void
lower_ubo_reference_visitor::write_to_memory(ir_dereference *deref,
ir_variable *var,
ir_variable *write_var,
unsigned write_mask)
{
ir_rvalue *offset = NULL;
unsigned const_offset;
bool row_major;
int matrix_columns;
unsigned packing = var->get_interface_type()->interface_packing;
/* Compute the offset to the start if the dereference as well as other
* information we need to configure the write
*/
setup_for_load_or_store(var, deref,
&offset, &const_offset,
&row_major, &matrix_columns,
packing);
assert(offset);
/* Now emit writes from the temporary to memory */
ir_variable *write_offset =
new(mem_ctx) ir_variable(glsl_type::uint_type,
"ssbo_store_temp_offset",
ir_var_temporary);
base_ir->insert_before(write_offset);
base_ir->insert_before(assign(write_offset, offset));
deref = new(mem_ctx) ir_dereference_variable(write_var);
emit_access(true, deref, write_offset, const_offset,
row_major, matrix_columns, packing, write_mask);
}
ir_visitor_status
lower_ubo_reference_visitor::visit_enter(ir_expression *ir)
{
check_ssbo_unsized_array_length_expression(ir);
return rvalue_visit(ir);
}
ir_expression *
lower_ubo_reference_visitor::calculate_ssbo_unsized_array_length(ir_expression *expr)
{
if (expr->operation !=
ir_expression_operation(ir_unop_ssbo_unsized_array_length))
return NULL;
ir_rvalue *rvalue = expr->operands[0]->as_rvalue();
if (!rvalue ||
!rvalue->type->is_array() || !rvalue->type->is_unsized_array())
return NULL;
ir_dereference *deref = expr->operands[0]->as_dereference();
if (!deref)
return NULL;
ir_variable *var = expr->operands[0]->variable_referenced();
if (!var || !var->is_in_shader_storage_block())
return NULL;
return process_ssbo_unsized_array_length(&rvalue, deref, var);
}
void
lower_ubo_reference_visitor::check_ssbo_unsized_array_length_expression(ir_expression *ir)
{
if (ir->operation ==
ir_expression_operation(ir_unop_ssbo_unsized_array_length)) {
/* Don't replace this unop if it is found alone. It is going to be
* removed by the optimization passes or replaced if it is part of
* an ir_assignment or another ir_expression.
*/
return;
}
for (unsigned i = 0; i < ir->get_num_operands(); i++) {
if (ir->operands[i]->ir_type != ir_type_expression)
continue;
ir_expression *expr = (ir_expression *) ir->operands[i];
ir_expression *temp = calculate_ssbo_unsized_array_length(expr);
if (!temp)
continue;
delete expr;
ir->operands[i] = temp;
}
}
void
lower_ubo_reference_visitor::check_ssbo_unsized_array_length_assignment(ir_assignment *ir)
{
if (!ir->rhs || ir->rhs->ir_type != ir_type_expression)
return;
ir_expression *expr = (ir_expression *) ir->rhs;
ir_expression *temp = calculate_ssbo_unsized_array_length(expr);
if (!temp)
return;
delete expr;
ir->rhs = temp;
return;
}
ir_expression *
lower_ubo_reference_visitor::emit_ssbo_get_buffer_size()
{
ir_rvalue *block_ref = this->uniform_block->clone(mem_ctx, NULL);
return new(mem_ctx) ir_expression(ir_unop_get_buffer_size,
glsl_type::int_type,
block_ref);
}
unsigned
lower_ubo_reference_visitor::calculate_unsized_array_stride(ir_dereference *deref,
unsigned packing)
{
unsigned array_stride = 0;
switch (deref->ir_type) {
case ir_type_dereference_variable:
{
ir_dereference_variable *deref_var = (ir_dereference_variable *)deref;
const struct glsl_type *unsized_array_type = NULL;
/* An unsized array can be sized by other lowering passes, so pick
* the first field of the array which has the data type of the unsized
* array.
*/
unsized_array_type = deref_var->var->type->fields.array;
/* Whether or not the field is row-major (because it might be a
* bvec2 or something) does not affect the array itself. We need
* to know whether an array element in its entirety is row-major.
*/
const bool array_row_major =
is_dereferenced_thing_row_major(deref_var);
if (packing == GLSL_INTERFACE_PACKING_STD430) {
array_stride = unsized_array_type->std430_array_stride(array_row_major);
} else {
array_stride = unsized_array_type->std140_size(array_row_major);
array_stride = glsl_align(array_stride, 16);
}
break;
}
case ir_type_dereference_record:
{
ir_dereference_record *deref_record = (ir_dereference_record *) deref;
ir_dereference *interface_deref =
deref_record->record->as_dereference();
assert(interface_deref != NULL);
const struct glsl_type *interface_type = interface_deref->type;
unsigned record_length = interface_type->length;
/* Unsized array is always the last element of the interface */
const struct glsl_type *unsized_array_type =
interface_type->fields.structure[record_length - 1].type->fields.array;
const bool array_row_major =
is_dereferenced_thing_row_major(deref_record);
if (packing == GLSL_INTERFACE_PACKING_STD430) {
array_stride = unsized_array_type->std430_array_stride(array_row_major);
} else {
array_stride = unsized_array_type->std140_size(array_row_major);
array_stride = glsl_align(array_stride, 16);
}
break;
}
default:
unreachable("Unsupported dereference type");
}
return array_stride;
}
ir_expression *
lower_ubo_reference_visitor::process_ssbo_unsized_array_length(ir_rvalue **rvalue,
ir_dereference *deref,
ir_variable *var)
{
mem_ctx = ralloc_parent(*rvalue);
ir_rvalue *base_offset = NULL;
unsigned const_offset;
bool row_major;
int matrix_columns;
unsigned packing = var->get_interface_type()->interface_packing;
int unsized_array_stride = calculate_unsized_array_stride(deref, packing);
/* Compute the offset to the start if the dereference as well as other
* information we need to calculate the length.
*/
setup_for_load_or_store(var, deref,
&base_offset, &const_offset,
&row_major, &matrix_columns,
packing);
/* array.length() =
* max((buffer_object_size - offset_of_array) / stride_of_array, 0)
*/
ir_expression *buffer_size = emit_ssbo_get_buffer_size();
ir_expression *offset_of_array = new(mem_ctx)
ir_expression(ir_binop_add, base_offset,
new(mem_ctx) ir_constant(const_offset));
ir_expression *offset_of_array_int = new(mem_ctx)
ir_expression(ir_unop_u2i, offset_of_array);
ir_expression *sub = new(mem_ctx)
ir_expression(ir_binop_sub, buffer_size, offset_of_array_int);
ir_expression *div = new(mem_ctx)
ir_expression(ir_binop_div, sub,
new(mem_ctx) ir_constant(unsized_array_stride));
ir_expression *max = new(mem_ctx)
ir_expression(ir_binop_max, div, new(mem_ctx) ir_constant(0));
return max;
}
void
lower_ubo_reference_visitor::check_for_ssbo_store(ir_assignment *ir)
{
if (!ir || !ir->lhs)
return;
ir_rvalue *rvalue = ir->lhs->as_rvalue();
if (!rvalue)
return;
ir_dereference *deref = ir->lhs->as_dereference();
if (!deref)
return;
ir_variable *var = ir->lhs->variable_referenced();
if (!var || !var->is_in_buffer_block())
return;
/* We have a write to a buffer variable, so declare a temporary and rewrite
* the assignment so that the temporary is the LHS.
*/
mem_ctx = ralloc_parent(shader->ir);
const glsl_type *type = rvalue->type;
ir_variable *write_var = new(mem_ctx) ir_variable(type,
"ssbo_store_temp",
ir_var_temporary);
base_ir->insert_before(write_var);
ir->lhs = new(mem_ctx) ir_dereference_variable(write_var);
/* Now we have to write the value assigned to the temporary back to memory */
write_to_memory(deref, var, write_var, ir->write_mask);
progress = true;
}
ir_visitor_status
lower_ubo_reference_visitor::visit_enter(ir_assignment *ir)
{
check_ssbo_unsized_array_length_assignment(ir);
check_for_ssbo_store(ir);
return rvalue_visit(ir);
}
/* Lowers the intrinsic call to a new internal intrinsic that swaps the
* access to the buffer variable in the first parameter by an offset
* and block index. This involves creating the new internal intrinsic
* (i.e. the new function signature).
*/
ir_call *
lower_ubo_reference_visitor::lower_ssbo_atomic_intrinsic(ir_call *ir)
{
/* SSBO atomics usually have 2 parameters, the buffer variable and an
* integer argument. The exception is CompSwap, that has an additional
* integer parameter.
*/
int param_count = ir->actual_parameters.length();
assert(param_count == 2 || param_count == 3);
/* First argument must be a scalar integer buffer variable */
exec_node *param = ir->actual_parameters.get_head();
ir_instruction *inst = (ir_instruction *) param;
assert(inst->ir_type == ir_type_dereference_variable ||
inst->ir_type == ir_type_dereference_array ||
inst->ir_type == ir_type_dereference_record ||
inst->ir_type == ir_type_swizzle);
ir_rvalue *deref = (ir_rvalue *) inst;
assert(deref->type->is_scalar() && deref->type->is_integer());
ir_variable *var = deref->variable_referenced();
assert(var);
/* Compute the offset to the start if the dereference and the
* block index
*/
mem_ctx = ralloc_parent(shader->ir);
ir_rvalue *offset = NULL;
unsigned const_offset;
bool row_major;
int matrix_columns;
unsigned packing = var->get_interface_type()->interface_packing;
setup_for_load_or_store(var, deref,
&offset, &const_offset,
&row_major, &matrix_columns,
packing);
assert(offset);
assert(!row_major);
assert(matrix_columns == 1);
ir_rvalue *deref_offset =
add(offset, new(mem_ctx) ir_constant(const_offset));
ir_rvalue *block_index = this->uniform_block->clone(mem_ctx, NULL);
/* Create the new internal function signature that will take a block
* index and offset instead of a buffer variable
*/
exec_list sig_params;
ir_variable *sig_param = new(mem_ctx)
ir_variable(glsl_type::uint_type, "block_ref" , ir_var_function_in);
sig_params.push_tail(sig_param);
sig_param = new(mem_ctx)
ir_variable(glsl_type::uint_type, "offset" , ir_var_function_in);
sig_params.push_tail(sig_param);
const glsl_type *type = deref->type->base_type == GLSL_TYPE_INT ?
glsl_type::int_type : glsl_type::uint_type;
sig_param = new(mem_ctx)
ir_variable(type, "data1", ir_var_function_in);
sig_params.push_tail(sig_param);
if (param_count == 3) {
sig_param = new(mem_ctx)
ir_variable(type, "data2", ir_var_function_in);
sig_params.push_tail(sig_param);
}
ir_function_signature *sig =
new(mem_ctx) ir_function_signature(deref->type,
shader_storage_buffer_object);
assert(sig);
sig->replace_parameters(&sig_params);
sig->is_intrinsic = true;
char func_name[64];
sprintf(func_name, "%s_internal", ir->callee_name());
ir_function *f = new(mem_ctx) ir_function(func_name);
f->add_signature(sig);
/* Now, create the call to the internal intrinsic */
exec_list call_params;
call_params.push_tail(block_index);
call_params.push_tail(deref_offset);
param = ir->actual_parameters.get_head()->get_next();
ir_rvalue *param_as_rvalue = ((ir_instruction *) param)->as_rvalue();
call_params.push_tail(param_as_rvalue->clone(mem_ctx, NULL));
if (param_count == 3) {
param = param->get_next();
param_as_rvalue = ((ir_instruction *) param)->as_rvalue();
call_params.push_tail(param_as_rvalue->clone(mem_ctx, NULL));
}
ir_dereference_variable *return_deref =
ir->return_deref->clone(mem_ctx, NULL);
return new(mem_ctx) ir_call(sig, return_deref, &call_params);
}
ir_call *
lower_ubo_reference_visitor::check_for_ssbo_atomic_intrinsic(ir_call *ir)
{
const char *callee = ir->callee_name();
if (!strcmp("__intrinsic_ssbo_atomic_add", callee) ||
!strcmp("__intrinsic_ssbo_atomic_min", callee) ||
!strcmp("__intrinsic_ssbo_atomic_max", callee) ||
!strcmp("__intrinsic_ssbo_atomic_and", callee) ||
!strcmp("__intrinsic_ssbo_atomic_or", callee) ||
!strcmp("__intrinsic_ssbo_atomic_xor", callee) ||
!strcmp("__intrinsic_ssbo_atomic_exchange", callee) ||
!strcmp("__intrinsic_ssbo_atomic_comp_swap", callee)) {
return lower_ssbo_atomic_intrinsic(ir);
}
return ir;
}
ir_visitor_status
lower_ubo_reference_visitor::visit_enter(ir_call *ir)
{
ir_call *new_ir = check_for_ssbo_atomic_intrinsic(ir);
if (new_ir != ir) {
progress = true;
base_ir->replace_with(new_ir);
return visit_continue_with_parent;
}
return rvalue_visit(ir);
}
} /* unnamed namespace */
void
lower_ubo_reference(struct gl_shader *shader, exec_list *instructions)
{
lower_ubo_reference_visitor v(shader);
/* Loop over the instructions lowering references, because we take
* a deref of a UBO array using a UBO dereference as the index will
* produce a collection of instructions all of which have cloned
* UBO dereferences for that array index.
*/
do {
v.progress = false;
visit_list_elements(&v, instructions);
} while (v.progress);
}
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