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// Copyright 2022 The Tint Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef SRC_TINT_LANG_WGSL_AST_TRANSFORM_BUILTIN_POLYFILL_H_
#define SRC_TINT_LANG_WGSL_AST_TRANSFORM_BUILTIN_POLYFILL_H_
#include "src/tint/lang/wgsl/ast/transform/transform.h"
namespace tint::ast::transform {
/// Implements builtins for backends that do not have a native implementation.
class BuiltinPolyfill final : public Castable<BuiltinPolyfill, Transform> {
public:
/// Constructor
BuiltinPolyfill();
/// Destructor
~BuiltinPolyfill() override;
/// Enumerator of polyfill levels
enum class Level {
/// No polyfill needed, supported by the backend.
kNone,
/// Clamp the parameters to the inner implementation.
kClampParameters,
/// Range check the input.
kRangeCheck,
/// Polyfill the entire function
kFull,
};
/// Specifies the builtins that should be polyfilled by the transform.
struct Builtins {
/// What level should `acosh` be polyfilled?
Level acosh = Level::kNone;
/// Should `asinh` be polyfilled?
bool asinh = false;
/// What level should `atanh` be polyfilled?
Level atanh = Level::kNone;
/// Should storage textures of format 'bgra8unorm' be replaced with 'rgba8unorm'?
bool bgra8unorm = false;
/// Should the RHS of `<<` and `>>` be wrapped in a modulo bit-width of LHS?
bool bitshift_modulo = false;
/// Should `clamp()` be polyfilled for integer values (scalar or vector)?
bool clamp_int = false;
/// Should `countLeadingZeros()` be polyfilled?
bool count_leading_zeros = false;
/// Should `countTrailingZeros()` be polyfilled?
bool count_trailing_zeros = false;
/// Should converting f32 to i32 or u32 be polyfilled?
bool conv_f32_to_iu32 = false;
/// What level should `extractBits()` be polyfilled?
Level extract_bits = Level::kNone;
/// Should `firstLeadingBit()` be polyfilled?
bool first_leading_bit = false;
/// Should `firstTrailingBit()` be polyfilled?
bool first_trailing_bit = false;
/// Should `insertBits()` be polyfilled?
Level insert_bits = Level::kNone;
/// Should integer scalar / vector divides and modulos be polyfilled to avoid DBZ and
/// integer overflows?
bool int_div_mod = false;
/// Should float modulos be polyfilled to emit a precise modulo operation as per the spec?
bool precise_float_mod = false;
/// Should `reflect()` be polyfilled for vec2<f32>?
bool reflect_vec2_f32 = false;
/// Should `saturate()` be polyfilled?
bool saturate = false;
/// Should `sign()` be polyfilled for integer types?
bool sign_int = false;
/// Should `textureSampleBaseClampToEdge()` be polyfilled for texture_2d<f32> textures?
bool texture_sample_base_clamp_to_edge_2d_f32 = false;
/// Should the vector form of `quantizeToF16()` be polyfilled with a scalar implementation?
/// See crbug.com/tint/1741
bool quantize_to_vec_f16 = false;
/// Should `workgroupUniformLoad()` be polyfilled?
bool workgroup_uniform_load = false;
};
/// Config is consumed by the BuiltinPolyfill transform.
/// Config specifies the builtins that should be polyfilled.
struct Config final : public Castable<Config, Data> {
/// Constructor
/// @param b the list of builtins to polyfill
explicit Config(const Builtins& b);
/// Copy constructor
Config(const Config&);
/// Destructor
~Config() override;
/// The builtins to polyfill
const Builtins builtins;
};
/// @copydoc Transform::Apply
ApplyResult Apply(const Program* program,
const DataMap& inputs,
DataMap& outputs) const override;
private:
struct State;
};
} // namespace tint::ast::transform
#endif // SRC_TINT_LANG_WGSL_AST_TRANSFORM_BUILTIN_POLYFILL_H_