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Adding new transform to workaround D3D's vertex/instance_index always starting from 0 Bug: dawn:548 Change-Id: I048f39e76e236570f3ce337a77d804384ee659a4 Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/34600 Commit-Queue: Enrico Galli <enrico.galli@intel.com> Reviewed-by: dan sinclair <dsinclair@chromium.org>
226 lines
7.7 KiB
C++
226 lines
7.7 KiB
C++
// Copyright 2020 The Tint Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "src/transform/first_index_offset.h"
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#include <cassert>
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#include <utility>
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#include "src/ast/array_accessor_expression.h"
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#include "src/ast/assignment_statement.h"
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#include "src/ast/binary_expression.h"
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#include "src/ast/bitcast_expression.h"
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#include "src/ast/break_statement.h"
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#include "src/ast/builtin_decoration.h"
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#include "src/ast/call_statement.h"
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#include "src/ast/case_statement.h"
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#include "src/ast/constructor_expression.h"
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#include "src/ast/decorated_variable.h"
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#include "src/ast/else_statement.h"
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#include "src/ast/expression.h"
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#include "src/ast/fallthrough_statement.h"
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#include "src/ast/identifier_expression.h"
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#include "src/ast/if_statement.h"
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#include "src/ast/loop_statement.h"
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#include "src/ast/member_accessor_expression.h"
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#include "src/ast/return_statement.h"
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#include "src/ast/scalar_constructor_expression.h"
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#include "src/ast/struct.h"
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#include "src/ast/struct_block_decoration.h"
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#include "src/ast/struct_decoration.h"
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#include "src/ast/struct_member.h"
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#include "src/ast/struct_member_offset_decoration.h"
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#include "src/ast/switch_statement.h"
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#include "src/ast/type/struct_type.h"
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#include "src/ast/type/u32_type.h"
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#include "src/ast/type_constructor_expression.h"
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#include "src/ast/unary_op_expression.h"
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#include "src/ast/variable.h"
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#include "src/ast/variable_decl_statement.h"
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#include "src/ast/variable_decoration.h"
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#include "src/type_determiner.h"
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namespace tint {
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namespace transform {
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namespace {
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constexpr char kStructName[] = "TintFirstIndexOffsetData";
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constexpr char kBufferName[] = "tint_first_index_data";
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constexpr char kFirstVertexName[] = "tint_first_vertex_index";
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constexpr char kFirstInstanceName[] = "tint_first_instance_index";
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constexpr char kIndexOffsetPrefix[] = "tint_first_index_offset_";
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} // namespace
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FirstIndexOffset::FirstIndexOffset(uint32_t binding, uint32_t set)
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: binding_(binding), set_(set) {}
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FirstIndexOffset::~FirstIndexOffset() = default;
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Transform::Output FirstIndexOffset::Run(ast::Module* in) {
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Output out;
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out.module = in->Clone();
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auto* mod = &out.module;
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// Running TypeDeterminer as we require local_referenced_builtin_variables()
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// to be populated
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TypeDeterminer td(mod);
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if (!td.Determine()) {
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diag::Diagnostic err;
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err.severity = diag::Severity::Error;
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err.message = td.error();
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out.diagnostics.add(std::move(err));
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return out;
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}
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std::string vertex_index_name;
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std::string instance_index_name;
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for (ast::Variable* var : mod->global_variables()) {
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if (auto* dec_var = var->As<ast::DecoratedVariable>()) {
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if (dec_var->name() == kBufferName) {
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diag::Diagnostic err;
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err.message = "First index offset transform has already been applied.";
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err.severity = diag::Severity::Error;
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out.diagnostics.add(std::move(err));
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return out;
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}
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for (ast::VariableDecoration* dec : dec_var->decorations()) {
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if (auto* blt_dec = dec->As<ast::BuiltinDecoration>()) {
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ast::Builtin blt_type = blt_dec->value();
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if (blt_type == ast::Builtin::kVertexIdx) {
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vertex_index_name = var->name();
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var->set_name(kIndexOffsetPrefix + var->name());
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has_vertex_index_ = true;
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} else if (blt_type == ast::Builtin::kInstanceIdx) {
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instance_index_name = var->name();
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var->set_name(kIndexOffsetPrefix + var->name());
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has_instance_index_ = true;
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}
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}
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}
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}
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}
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if (!has_vertex_index_ && !has_instance_index_) {
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return out;
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}
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ast::Variable* buffer_var = AddUniformBuffer(mod);
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for (ast::Function* func : mod->functions()) {
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for (const auto& data : func->local_referenced_builtin_variables()) {
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if (data.second->value() == ast::Builtin::kVertexIdx) {
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AddFirstIndexOffset(vertex_index_name, kFirstVertexName, buffer_var,
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func, mod);
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} else if (data.second->value() == ast::Builtin::kInstanceIdx) {
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AddFirstIndexOffset(instance_index_name, kFirstInstanceName, buffer_var,
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func, mod);
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}
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}
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}
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return out;
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}
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bool FirstIndexOffset::HasVertexIndex() {
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return has_vertex_index_;
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}
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bool FirstIndexOffset::HasInstanceIndex() {
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return has_instance_index_;
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}
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uint32_t FirstIndexOffset::GetFirstVertexOffset() {
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assert(has_vertex_index_);
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return vertex_index_offset_;
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}
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uint32_t FirstIndexOffset::GetFirstInstanceOffset() {
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assert(has_instance_index_);
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return instance_index_offset_;
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}
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ast::Variable* FirstIndexOffset::AddUniformBuffer(ast::Module* mod) {
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auto* u32_type = mod->create<ast::type::U32>();
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ast::StructMemberList members;
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uint32_t offset = 0;
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if (has_vertex_index_) {
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ast::StructMemberDecorationList member_dec;
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member_dec.push_back(
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mod->create<ast::StructMemberOffsetDecoration>(offset, Source{}));
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members.push_back(mod->create<ast::StructMember>(kFirstVertexName, u32_type,
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std::move(member_dec)));
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vertex_index_offset_ = offset;
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offset += 4;
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}
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if (has_instance_index_) {
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ast::StructMemberDecorationList member_dec;
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member_dec.push_back(
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mod->create<ast::StructMemberOffsetDecoration>(offset, Source{}));
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members.push_back(mod->create<ast::StructMember>(
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kFirstInstanceName, u32_type, std::move(member_dec)));
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instance_index_offset_ = offset;
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offset += 4;
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}
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ast::StructDecorationList decos;
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decos.push_back(mod->create<ast::StructBlockDecoration>(Source{}));
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auto* struct_type = mod->create<ast::type::Struct>(
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kStructName,
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mod->create<ast::Struct>(std::move(decos), std::move(members)));
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auto* idx_var =
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mod->create<ast::DecoratedVariable>(mod->create<ast::Variable>(
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Source{}, kBufferName, ast::StorageClass::kUniform, struct_type));
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ast::VariableDecorationList decorations;
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decorations.push_back(
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mod->create<ast::BindingDecoration>(binding_, Source{}));
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decorations.push_back(mod->create<ast::SetDecoration>(set_, Source{}));
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idx_var->set_decorations(std::move(decorations));
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mod->AddGlobalVariable(idx_var);
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mod->AddConstructedType(struct_type);
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return idx_var;
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}
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void FirstIndexOffset::AddFirstIndexOffset(const std::string& original_name,
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const std::string& field_name,
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ast::Variable* buffer_var,
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ast::Function* func,
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ast::Module* mod) {
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auto* buffer = mod->create<ast::IdentifierExpression>(buffer_var->name());
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auto* var = mod->create<ast::Variable>(Source{}, original_name,
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ast::StorageClass::kNone,
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mod->create<ast::type::U32>());
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var->set_is_const(true);
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var->set_constructor(mod->create<ast::BinaryExpression>(
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ast::BinaryOp::kAdd,
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mod->create<ast::IdentifierExpression>(kIndexOffsetPrefix + var->name()),
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mod->create<ast::MemberAccessorExpression>(
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buffer, mod->create<ast::IdentifierExpression>(field_name))));
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func->body()->insert(0,
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mod->create<ast::VariableDeclStatement>(std::move(var)));
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}
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} // namespace transform
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} // namespace tint
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