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+// Copyright (c) 2021 The Khronos Group Inc.
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+// Copyright (c) 2021 Valve Corporation
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+// Copyright (c) 2021 LunarG Inc.
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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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+
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+#include "source/opt/interp_fixup_pass.h"
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+
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+#include <set>
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+#include <string>
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+
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+#include "ir_builder.h"
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+#include "source/opt/ir_context.h"
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+#include "type_manager.h"
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+
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+namespace spvtools {
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+namespace opt {
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+
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+namespace {
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+
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+// Input Operand Indices
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+static const int kSpvVariableStorageClassInIdx = 0;
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+
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+// Avoid unused variable warning/error on Linux
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+#ifndef NDEBUG
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+#define USE_ASSERT(x) assert(x)
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+#else
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+#define USE_ASSERT(x) ((void)(x))
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+#endif
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+
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+// Folding rule function which attempts to replace |op(OpLoad(a),...)|
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+// by |op(a,...)|, where |op| is one of the GLSLstd450 InterpolateAt*
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+// instructions. Returns true if replaced, false otherwise.
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+bool ReplaceInternalInterpolate(IRContext* ctx, Instruction* inst,
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+ const std::vector<const analysis::Constant*>&) {
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+ uint32_t glsl450_ext_inst_id =
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+ ctx->get_feature_mgr()->GetExtInstImportId_GLSLstd450();
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+ assert(glsl450_ext_inst_id != 0);
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+
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+ uint32_t ext_opcode = inst->GetSingleWordInOperand(1);
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+
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+ uint32_t op1_id = inst->GetSingleWordInOperand(2);
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+
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+ Instruction* load_inst = ctx->get_def_use_mgr()->GetDef(op1_id);
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+ if (load_inst->opcode() != SpvOpLoad) return false;
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+
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+ Instruction* base_inst = load_inst->GetBaseAddress();
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+ USE_ASSERT(base_inst->opcode() == SpvOpVariable &&
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+ base_inst->GetSingleWordInOperand(kSpvVariableStorageClassInIdx) ==
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+ SpvStorageClassInput &&
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+ "unexpected interpolant in InterpolateAt*");
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+
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+ uint32_t ptr_id = load_inst->GetSingleWordInOperand(0);
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+ uint32_t op2_id = (ext_opcode != GLSLstd450InterpolateAtCentroid)
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+ ? inst->GetSingleWordInOperand(3)
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+ : 0;
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+
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+ Instruction::OperandList new_operands;
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+ new_operands.push_back({SPV_OPERAND_TYPE_ID, {glsl450_ext_inst_id}});
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+ new_operands.push_back(
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+ {SPV_OPERAND_TYPE_EXTENSION_INSTRUCTION_NUMBER, {ext_opcode}});
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+ new_operands.push_back({SPV_OPERAND_TYPE_ID, {ptr_id}});
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+ if (op2_id != 0) new_operands.push_back({SPV_OPERAND_TYPE_ID, {op2_id}});
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+
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+ inst->SetInOperands(std::move(new_operands));
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+ ctx->UpdateDefUse(inst);
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+ return true;
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+}
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+
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+class InterpFoldingRules : public FoldingRules {
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+ public:
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+ explicit InterpFoldingRules(IRContext* ctx) : FoldingRules(ctx) {}
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+
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+ protected:
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+ virtual void AddFoldingRules() override {
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+ uint32_t extension_id =
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+ context()->get_feature_mgr()->GetExtInstImportId_GLSLstd450();
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+
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+ if (extension_id != 0) {
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+ ext_rules_[{extension_id, GLSLstd450InterpolateAtCentroid}].push_back(
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+ ReplaceInternalInterpolate);
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+ ext_rules_[{extension_id, GLSLstd450InterpolateAtSample}].push_back(
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+ ReplaceInternalInterpolate);
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+ ext_rules_[{extension_id, GLSLstd450InterpolateAtOffset}].push_back(
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+ ReplaceInternalInterpolate);
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+ }
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+ }
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+};
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+
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+class InterpConstFoldingRules : public ConstantFoldingRules {
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+ public:
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+ InterpConstFoldingRules(IRContext* ctx) : ConstantFoldingRules(ctx) {}
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+
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+ protected:
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+ virtual void AddFoldingRules() override {}
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+};
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+
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+} // namespace
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+
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+Pass::Status InterpFixupPass::Process() {
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+ bool changed = false;
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+
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+ // Traverse the body of the functions to replace instructions that require
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+ // the extensions.
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+ InstructionFolder folder(
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+ context(),
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+ std::unique_ptr<InterpFoldingRules>(new InterpFoldingRules(context())),
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+ MakeUnique<InterpConstFoldingRules>(context()));
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+ for (Function& func : *get_module()) {
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+ func.ForEachInst([&changed, &folder](Instruction* inst) {
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+ if (folder.FoldInstruction(inst)) {
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+ changed = true;
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+ }
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+ });
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+ }
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+
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+ return changed ? Status::SuccessWithChange : Status::SuccessWithoutChange;
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+}
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+
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+} // namespace opt
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+} // namespace spvtools
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Бранимир Караџић