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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.
*/
#include "ir.h"
#include "linker.h"
#include "ir_uniform.h"
#include "link_uniform_block_active_visitor.h"
#include "util/hash_table.h"
#include "program.h"
#include "main/errors.h"
#include "main/mtypes.h"
namespace {
class ubo_visitor : public program_resource_visitor {
public:
ubo_visitor(void *mem_ctx, gl_uniform_buffer_variable *variables,
unsigned num_variables, struct gl_shader_program *prog,
bool use_std430_as_default)
: index(0), offset(0), buffer_size(0), variables(variables),
num_variables(num_variables), mem_ctx(mem_ctx),
is_array_instance(false), prog(prog),
use_std430_as_default(use_std430_as_default)
{
/* empty */
}
void process(const glsl_type *type, const char *name)
{
this->offset = 0;
this->buffer_size = 0;
this->is_array_instance = strchr(name, ']') != NULL;
this->program_resource_visitor::process(type, name,
use_std430_as_default);
}
unsigned index;
unsigned offset;
unsigned buffer_size;
gl_uniform_buffer_variable *variables;
unsigned num_variables;
void *mem_ctx;
bool is_array_instance;
struct gl_shader_program *prog;
private:
virtual void enter_record(const glsl_type *type, const char *,
bool row_major,
const enum glsl_interface_packing packing)
{
assert(type->is_struct());
if (packing == GLSL_INTERFACE_PACKING_STD430)
this->offset = glsl_align(
this->offset, type->std430_base_alignment(row_major));
else
this->offset = glsl_align(
this->offset, type->std140_base_alignment(row_major));
}
virtual void leave_record(const glsl_type *type, const char *,
bool row_major,
const enum glsl_interface_packing packing)
{
assert(type->is_struct());
/* If this is the last field of a structure, apply rule #9. The
* ARB_uniform_buffer_object spec says:
*
* 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 (packing == GLSL_INTERFACE_PACKING_STD430)
this->offset = glsl_align(
this->offset, type->std430_base_alignment(row_major));
else
this->offset = glsl_align(
this->offset, type->std140_base_alignment(row_major));
}
virtual void set_buffer_offset(unsigned offset)
{
this->offset = offset;
}
virtual void visit_field(const glsl_type *type, const char *name,
bool row_major, const glsl_type *,
const enum glsl_interface_packing packing,
bool last_field)
{
assert(this->index < this->num_variables);
gl_uniform_buffer_variable *v = &this->variables[this->index++];
v->Name = ralloc_strdup(mem_ctx, name);
v->Type = type;
v->RowMajor = type->without_array()->is_matrix() && row_major;
if (this->is_array_instance) {
v->IndexName = ralloc_strdup(mem_ctx, name);
char *open_bracket = strchr(v->IndexName, '[');
assert(open_bracket != NULL);
char *close_bracket = strchr(open_bracket, '.') - 1;
assert(close_bracket != NULL);
/* Length of the tail without the ']' but with the NUL.
*/
unsigned len = strlen(close_bracket + 1) + 1;
memmove(open_bracket, close_bracket + 1, len);
} else {
v->IndexName = v->Name;
}
unsigned alignment = 0;
unsigned size = 0;
/* The ARB_program_interface_query spec says:
*
* If the final member of an active shader storage block is array
* with no declared size, the minimum buffer size is computed
* assuming the array was declared as an array with one element.
*
* For that reason, we use the base type of the unsized array to
* calculate its size. We don't need to check if the unsized array is
* the last member of a shader storage block (that check was already
* done by the parser).
*/
const glsl_type *type_for_size = type;
if (type->is_unsized_array()) {
if (!last_field) {
linker_error(prog, "unsized array `%s' definition: "
"only last member of a shader storage block "
"can be defined as unsized array",
name);
}
type_for_size = type->without_array();
}
if (packing == GLSL_INTERFACE_PACKING_STD430) {
alignment = type->std430_base_alignment(v->RowMajor);
size = type_for_size->std430_size(v->RowMajor);
} else {
alignment = type->std140_base_alignment(v->RowMajor);
size = type_for_size->std140_size(v->RowMajor);
}
this->offset = glsl_align(this->offset, alignment);
v->Offset = this->offset;
this->offset += size;
/* The ARB_uniform_buffer_object spec says:
*
* For uniform blocks laid out according to [std140] rules, the
* minimum buffer object size returned by the UNIFORM_BLOCK_DATA_SIZE
* query is derived by taking the offset of the last basic machine
* unit consumed by the last uniform of the uniform block (including
* any end-of-array or end-of-structure padding), adding one, and
* rounding up to the next multiple of the base alignment required
* for a vec4.
*/
this->buffer_size = glsl_align(this->offset, 16);
}
bool use_std430_as_default;
};
class count_block_size : public program_resource_visitor {
public:
count_block_size() : num_active_uniforms(0)
{
/* empty */
}
unsigned num_active_uniforms;
private:
virtual void visit_field(const glsl_type * /* type */,
const char * /* name */,
bool /* row_major */,
const glsl_type * /* record_type */,
const enum glsl_interface_packing,
bool /* last_field */)
{
this->num_active_uniforms++;
}
};
} /* anonymous namespace */
struct block {
const glsl_type *type;
bool has_instance_name;
};
static void process_block_array_leaf(const char *name, gl_uniform_block *blocks,
ubo_visitor *parcel,
gl_uniform_buffer_variable *variables,
const struct link_uniform_block_active *const b,
unsigned *block_index,
unsigned binding_offset,
unsigned linearized_index,
struct gl_context *ctx,
struct gl_shader_program *prog);
/**
*
* \param first_index Value of \c block_index for the first element of the
* array.
*/
static void
process_block_array(struct uniform_block_array_elements *ub_array, char **name,
size_t name_length, gl_uniform_block *blocks,
ubo_visitor *parcel, gl_uniform_buffer_variable *variables,
const struct link_uniform_block_active *const b,
unsigned *block_index, unsigned binding_offset,
struct gl_context *ctx, struct gl_shader_program *prog,
unsigned first_index)
{
for (unsigned j = 0; j < ub_array->num_array_elements; j++) {
size_t new_length = name_length;
unsigned int element_idx = ub_array->array_elements[j];
/* Append the subscript to the current variable name */
ralloc_asprintf_rewrite_tail(name, &new_length, "[%u]", element_idx);
if (ub_array->array) {
unsigned binding_stride = binding_offset + (element_idx *
ub_array->array->aoa_size);
process_block_array(ub_array->array, name, new_length, blocks,
parcel, variables, b, block_index,
binding_stride, ctx, prog, first_index);
} else {
process_block_array_leaf(*name, blocks,
parcel, variables, b, block_index,
binding_offset + element_idx,
*block_index - first_index, ctx, prog);
}
}
}
static void
process_block_array_leaf(const char *name,
gl_uniform_block *blocks,
ubo_visitor *parcel, gl_uniform_buffer_variable *variables,
const struct link_uniform_block_active *const b,
unsigned *block_index, unsigned binding_offset,
unsigned linearized_index,
struct gl_context *ctx, struct gl_shader_program *prog)
{
unsigned i = *block_index;
const glsl_type *type = b->type->without_array();
blocks[i].Name = ralloc_strdup(blocks, name);
blocks[i].Uniforms = &variables[(*parcel).index];
/* The ARB_shading_language_420pack spec says:
*
* If the binding identifier is used with a uniform block instanced as
* an array then the first element of the array takes the specified
* block binding and each subsequent element takes the next consecutive
* uniform block binding point.
*/
blocks[i].Binding = (b->has_binding) ? b->binding + binding_offset : 0;
blocks[i].UniformBufferSize = 0;
blocks[i]._Packing = glsl_interface_packing(type->interface_packing);
blocks[i]._RowMajor = type->get_interface_row_major();
blocks[i].linearized_array_index = linearized_index;
parcel->process(type, b->has_instance_name ? blocks[i].Name : "");
blocks[i].UniformBufferSize = parcel->buffer_size;
/* Check SSBO size is lower than maximum supported size for SSBO */
if (b->is_shader_storage &&
parcel->buffer_size > ctx->Const.MaxShaderStorageBlockSize) {
linker_error(prog, "shader storage block `%s' has size %d, "
"which is larger than the maximum allowed (%d)",
b->type->name,
parcel->buffer_size,
ctx->Const.MaxShaderStorageBlockSize);
}
blocks[i].NumUniforms =
(unsigned)(ptrdiff_t)(&variables[parcel->index] - blocks[i].Uniforms);
*block_index = *block_index + 1;
}
/* This function resizes the array types of the block so that later we can use
* this new size to correctly calculate the offest for indirect indexing.
*/
static const glsl_type *
resize_block_array(const glsl_type *type,
struct uniform_block_array_elements *ub_array)
{
if (type->is_array()) {
struct uniform_block_array_elements *child_array =
type->fields.array->is_array() ? ub_array->array : NULL;
const glsl_type *new_child_type =
resize_block_array(type->fields.array, child_array);
const glsl_type *new_type =
glsl_type::get_array_instance(new_child_type,
ub_array->num_array_elements);
ub_array->ir->array->type = new_type;
return new_type;
} else {
return type;
}
}
static void
create_buffer_blocks(void *mem_ctx, struct gl_context *ctx,
struct gl_shader_program *prog,
struct gl_uniform_block **out_blks, unsigned num_blocks,
struct hash_table *block_hash, unsigned num_variables,
bool create_ubo_blocks)
{
if (num_blocks == 0) {
assert(num_variables == 0);
return;
}
assert(num_variables != 0);
/* Allocate storage to hold all of the information related to uniform
* blocks that can be queried through the API.
*/
struct gl_uniform_block *blocks =
rzalloc_array(mem_ctx, gl_uniform_block, num_blocks);
gl_uniform_buffer_variable *variables =
ralloc_array(blocks, gl_uniform_buffer_variable, num_variables);
/* Add each variable from each uniform block to the API tracking
* structures.
*/
ubo_visitor parcel(blocks, variables, num_variables, prog,
ctx->Const.UseSTD430AsDefaultPacking);
unsigned i = 0;
hash_table_foreach (block_hash, entry) {
const struct link_uniform_block_active *const b =
(const struct link_uniform_block_active *) entry->data;
const glsl_type *block_type = b->type;
if ((create_ubo_blocks && !b->is_shader_storage) ||
(!create_ubo_blocks && b->is_shader_storage)) {
if (b->array != NULL) {
char *name = ralloc_strdup(NULL,
block_type->without_array()->name);
size_t name_length = strlen(name);
assert(b->has_instance_name);
process_block_array(b->array, &name, name_length, blocks, &parcel,
variables, b, &i, 0, ctx, prog,
i);
ralloc_free(name);
} else {
process_block_array_leaf(block_type->name, blocks, &parcel,
variables, b, &i, 0,
0, ctx, prog);
}
}
}
*out_blks = blocks;
assert(parcel.index == num_variables);
}
void
link_uniform_blocks(void *mem_ctx,
struct gl_context *ctx,
struct gl_shader_program *prog,
struct gl_linked_shader *shader,
struct gl_uniform_block **ubo_blocks,
unsigned *num_ubo_blocks,
struct gl_uniform_block **ssbo_blocks,
unsigned *num_ssbo_blocks)
{
/* This hash table will track all of the uniform blocks that have been
* encountered. Since blocks with the same block-name must be the same,
* the hash is organized by block-name.
*/
struct hash_table *block_hash =
_mesa_hash_table_create(mem_ctx, _mesa_hash_string,
_mesa_key_string_equal);
if (block_hash == NULL) {
_mesa_error_no_memory(__func__);
linker_error(prog, "out of memory\n");
return;
}
/* Determine which uniform blocks are active. */
link_uniform_block_active_visitor v(mem_ctx, block_hash, prog);
visit_list_elements(&v, shader->ir);
/* Count the number of active uniform blocks. Count the total number of
* active slots in those uniform blocks.
*/
unsigned num_ubo_variables = 0;
unsigned num_ssbo_variables = 0;
count_block_size block_size;
hash_table_foreach (block_hash, entry) {
struct link_uniform_block_active *const b =
(struct link_uniform_block_active *) entry->data;
assert((b->array != NULL) == b->type->is_array());
if (b->array != NULL &&
(b->type->without_array()->interface_packing ==
GLSL_INTERFACE_PACKING_PACKED)) {
b->type = resize_block_array(b->type, b->array);
b->var->type = b->type;
b->var->data.max_array_access = b->type->length - 1;
}
block_size.num_active_uniforms = 0;
block_size.process(b->type->without_array(), "",
ctx->Const.UseSTD430AsDefaultPacking);
if (b->array != NULL) {
unsigned aoa_size = b->type->arrays_of_arrays_size();
if (b->is_shader_storage) {
*num_ssbo_blocks += aoa_size;
num_ssbo_variables += aoa_size * block_size.num_active_uniforms;
} else {
*num_ubo_blocks += aoa_size;
num_ubo_variables += aoa_size * block_size.num_active_uniforms;
}
} else {
if (b->is_shader_storage) {
(*num_ssbo_blocks)++;
num_ssbo_variables += block_size.num_active_uniforms;
} else {
(*num_ubo_blocks)++;
num_ubo_variables += block_size.num_active_uniforms;
}
}
}
create_buffer_blocks(mem_ctx, ctx, prog, ubo_blocks, *num_ubo_blocks,
block_hash, num_ubo_variables, true);
create_buffer_blocks(mem_ctx, ctx, prog, ssbo_blocks, *num_ssbo_blocks,
block_hash, num_ssbo_variables, false);
_mesa_hash_table_destroy(block_hash, NULL);
}
static bool
link_uniform_blocks_are_compatible(const gl_uniform_block *a,
const gl_uniform_block *b)
{
assert(strcmp(a->Name, b->Name) == 0);
/* Page 35 (page 42 of the PDF) in section 4.3.7 of the GLSL 1.50 spec says:
*
* Matched block names within an interface (as defined above) must match
* in terms of having the same number of declarations with the same
* sequence of types and the same sequence of member names, as well as
* having the same member-wise layout qualification....if a matching
* block is declared as an array, then the array sizes must also
* match... Any mismatch will generate a link error.
*
* Arrays are not yet supported, so there is no check for that.
*/
if (a->NumUniforms != b->NumUniforms)
return false;
if (a->_Packing != b->_Packing)
return false;
if (a->_RowMajor != b->_RowMajor)
return false;
if (a->Binding != b->Binding)
return false;
for (unsigned i = 0; i < a->NumUniforms; i++) {
if (strcmp(a->Uniforms[i].Name, b->Uniforms[i].Name) != 0)
return false;
if (a->Uniforms[i].Type != b->Uniforms[i].Type)
return false;
if (a->Uniforms[i].RowMajor != b->Uniforms[i].RowMajor)
return false;
}
return true;
}
/**
* Merges a uniform block into an array of uniform blocks that may or
* may not already contain a copy of it.
*
* Returns the index of the new block in the array.
*/
int
link_cross_validate_uniform_block(void *mem_ctx,
struct gl_uniform_block **linked_blocks,
unsigned int *num_linked_blocks,
struct gl_uniform_block *new_block)
{
for (unsigned int i = 0; i < *num_linked_blocks; i++) {
struct gl_uniform_block *old_block = &(*linked_blocks)[i];
if (strcmp(old_block->Name, new_block->Name) == 0)
return link_uniform_blocks_are_compatible(old_block, new_block)
? i : -1;
}
*linked_blocks = reralloc(mem_ctx, *linked_blocks,
struct gl_uniform_block,
*num_linked_blocks + 1);
int linked_block_index = (*num_linked_blocks)++;
struct gl_uniform_block *linked_block = &(*linked_blocks)[linked_block_index];
memcpy(linked_block, new_block, sizeof(*new_block));
linked_block->Uniforms = ralloc_array(*linked_blocks,
struct gl_uniform_buffer_variable,
linked_block->NumUniforms);
memcpy(linked_block->Uniforms,
new_block->Uniforms,
sizeof(*linked_block->Uniforms) * linked_block->NumUniforms);
linked_block->Name = ralloc_strdup(*linked_blocks, linked_block->Name);
for (unsigned int i = 0; i < linked_block->NumUniforms; i++) {
struct gl_uniform_buffer_variable *ubo_var =
&linked_block->Uniforms[i];
if (ubo_var->Name == ubo_var->IndexName) {
ubo_var->Name = ralloc_strdup(*linked_blocks, ubo_var->Name);
ubo_var->IndexName = ubo_var->Name;
} else {
ubo_var->Name = ralloc_strdup(*linked_blocks, ubo_var->Name);
ubo_var->IndexName = ralloc_strdup(*linked_blocks, ubo_var->IndexName);
}
}
return linked_block_index;
}