src/compiler/translator/tree_ops/MonomorphizeUnsupportedFunctions.h

//
// Copyright 2021 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// MonomorphizeUnsupportedFunctions: Monomorphize functions that are called with parameters that are
// incompatible with the target language, or cause complications for future transformations:
//
// - Samplers in structs
// - Structs that have samplers
// - Partially subscripted array of array of samplers
// - Partially subscripted array of array of images
// - Atomic counters
// - Pixel local storage planes
// - image* variables with r32f formats (to emulate imageAtomicExchange)
//
// Additionally, the ESSL spec has a bug with images as function arguments, as the layout qualifiers
// needed for the image are impossible to specify.
//
// This transformation basically duplicates such functions, removes the
// sampler/image/atomic_counter parameters and uses the opaque uniforms used by the caller.

#ifndef COMPILER_TRANSLATOR_TREEOPS_MONOMORPHIZEUNSUPPORTEDFUNCTIONS_H_
#define COMPILER_TRANSLATOR_TREEOPS_MONOMORPHIZEUNSUPPORTEDFUNCTIONS_H_

#include "common/angleutils.h"
#include "compiler/translator/Compiler.h"

namespace sh
{
class TIntermBlock;
class TSymbolTable;

// Types of function prameters that should trigger monomorphization.
enum class UnsupportedFunctionArgs
{
    StructContainingSamplers     = 0,
    ArrayOfArrayOfSamplerOrImage = 1,
    AtomicCounter                = 2,
    Image                        = 3,
    PixelLocalStorage            = 4,

    InvalidEnum = 6,
    EnumCount   = 6,
};

using UnsupportedFunctionArgsBitSet = angle::PackedEnumBitSet<UnsupportedFunctionArgs>;

[[nodiscard]] bool MonomorphizeUnsupportedFunctions(TCompiler *compiler,
                                                    TIntermBlock *root,
                                                    TSymbolTable *symbolTable,
                                                    UnsupportedFunctionArgsBitSet);
}  // namespace sh

#endif  // COMPILER_TRANSLATOR_TREEOPS_MONOMORPHIZEUNSUPPORTEDFUNCTIONS_H_