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https://github.com/KhronosGroup/SPIRV-Tools
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2ea4003633
* opt: split composite from array flattening DXC has an option to flatten resource arrays. But when this option is not used, the resource arrays should be kept as-is. On the other hand, when a struct contains resources, we MUST flatten is to be compliant with the Vulkan spec. Because this pass flattens both types of resources, using a struct of resources automatically implied flattening arrays. By adding those 2 new settings, we decide if the pass flattens only one type of resources, or both. Note: the flatten_arrays flag only impacts resource arrays. Arrays of composites containing resources are still flattened. Since the API is considered stable, I added 2 new functions to create passes with one flag or the other, and kept the original behavior as-is. Related to https://github.com/microsoft/DirectXShaderCompiler/issues/6745 Signed-off-by: Nathan Gauër <brioche@google.com> * add commandline options Signed-off-by: Nathan Gauër <brioche@google.com> * clang-format Signed-off-by: Nathan Gauër <brioche@google.com> --------- Signed-off-by: Nathan Gauër <brioche@google.com>
59 lines
2.2 KiB
C++
59 lines
2.2 KiB
C++
// Copyright (c) 2021 Google LLC
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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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#ifndef SOURCE_OPT_DESC_SROA_UTIL_H_
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#define SOURCE_OPT_DESC_SROA_UTIL_H_
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#include "source/opt/ir_context.h"
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namespace spvtools {
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namespace opt {
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// Provides functions for the descriptor array SROA.
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namespace descsroautil {
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// Returns true if |var| is an OpVariable instruction that represents a
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// descriptor array.
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bool IsDescriptorArray(IRContext* context, Instruction* var);
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// Returns true if |var| is an OpVariable instruction that represents a
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// struct containing descriptors.
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bool IsDescriptorStruct(IRContext* context, Instruction* var);
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// Returns true if |type| is a type that could be used for a structured buffer
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// as opposed to a type that would be used for a structure of resource
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// descriptors.
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bool IsTypeOfStructuredBuffer(IRContext* context, const Instruction* type);
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// Returns the first index of the OpAccessChain instruction |access_chain| as
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// a constant. Returns nullptr if it is not a constant.
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const analysis::Constant* GetAccessChainIndexAsConst(IRContext* context,
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Instruction* access_chain);
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// Returns the number of elements of an OpVariable instruction |var| whose type
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// must be a pointer to an array or a struct.
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uint32_t GetNumberOfElementsForArrayOrStruct(IRContext* context,
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Instruction* var);
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// Returns the first Indexes operand id of the OpAccessChain or
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// OpInBoundsAccessChain instruction |access_chain|. The access chain must have
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// at least 1 index.
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uint32_t GetFirstIndexOfAccessChain(Instruction* access_chain);
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} // namespace descsroautil
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} // namespace opt
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} // namespace spvtools
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#endif // SOURCE_OPT_DESC_SROA_UTIL_H_
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