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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.
#include "src/tint/transform/texture_1d_to_2d.h"
#include <utility>
#include "src/tint/program_builder.h"
#include "src/tint/sem/function.h"
#include "src/tint/sem/statement.h"
#include "src/tint/sem/type_expression.h"
#include "src/tint/switch.h"
#include "src/tint/type/texture_dimension.h"
TINT_INSTANTIATE_TYPEINFO(tint::transform::Texture1DTo2D);
using namespace tint::number_suffixes; // NOLINT
namespace tint::transform {
namespace {
bool ShouldRun(const Program* program) {
for (auto* fn : program->AST().Functions()) {
if (auto* sem_fn = program->Sem().Get(fn)) {
for (auto* builtin : sem_fn->DirectlyCalledBuiltins()) {
const auto& signature = builtin->Signature();
auto texture = signature.Parameter(sem::ParameterUsage::kTexture);
if (texture) {
auto* tex = texture->Type()->As<type::Texture>();
if (tex->dim() == type::TextureDimension::k1d) {
return true;
}
}
}
}
}
for (auto* var : program->AST().GlobalVariables()) {
if (Switch(
program->Sem().Get(var)->Type()->UnwrapRef(),
[&](const type::SampledTexture* tex) {
return tex->dim() == type::TextureDimension::k1d;
},
[&](const type::StorageTexture* storage_tex) {
return storage_tex->dim() == type::TextureDimension::k1d;
})) {
return true;
}
}
return false;
}
} // namespace
/// PIMPL state for the transform
struct Texture1DTo2D::State {
/// The source program
const Program* const src;
/// The target program builder
ProgramBuilder b;
/// The clone context
CloneContext ctx = {&b, src, /* auto_clone_symbols */ true};
/// Constructor
/// @param program the source program
explicit State(const Program* program) : src(program) {}
/// Runs the transform
/// @returns the new program or SkipTransform if the transform is not required
ApplyResult Run() {
auto& sem = src->Sem();
if (!ShouldRun(ctx.src)) {
return SkipTransform;
}
auto create_var = [&](const ast::Variable* v, ast::Type type) -> const ast::Variable* {
if (v->As<ast::Parameter>()) {
return ctx.dst->Param(ctx.Clone(v->name->symbol), type, ctx.Clone(v->attributes));
} else {
return ctx.dst->Var(ctx.Clone(v->name->symbol), type, ctx.Clone(v->attributes));
}
};
ctx.ReplaceAll([&](const ast::Variable* v) -> const ast::Variable* {
const ast::Variable* r = Switch(
sem.Get(v)->Type()->UnwrapRef(),
[&](const type::SampledTexture* tex) -> const ast::Variable* {
if (tex->dim() == type::TextureDimension::k1d) {
auto type = ctx.dst->ty.sampled_texture(type::TextureDimension::k2d,
CreateASTTypeFor(ctx, tex->type()));
return create_var(v, type);
} else {
return nullptr;
}
},
[&](const type::StorageTexture* storage_tex) -> const ast::Variable* {
if (storage_tex->dim() == type::TextureDimension::k1d) {
auto type = ctx.dst->ty.storage_texture(type::TextureDimension::k2d,
storage_tex->texel_format(),
storage_tex->access());
return create_var(v, type);
} else {
return nullptr;
}
},
[](Default) { return nullptr; });
return r;
});
ctx.ReplaceAll([&](const ast::CallExpression* c) -> const ast::Expression* {
auto* call = sem.Get(c)->UnwrapMaterialize()->As<sem::Call>();
if (!call) {
return nullptr;
}
auto* builtin = call->Target()->As<sem::Builtin>();
if (!builtin) {
return nullptr;
}
const auto& signature = builtin->Signature();
auto* texture = signature.Parameter(sem::ParameterUsage::kTexture);
if (!texture) {
return nullptr;
}
auto* tex = texture->Type()->As<type::Texture>();
if (tex->dim() != type::TextureDimension::k1d) {
return nullptr;
}
if (builtin->Type() == builtin::Function::kTextureDimensions) {
// If this textureDimensions() call is in a CallStatement, we can leave it
// unmodified since the return value will be dropped on the floor anyway.
if (call->Stmt()->Declaration()->Is<ast::CallStatement>()) {
return nullptr;
}
auto* new_call = ctx.CloneWithoutTransform(c);
return ctx.dst->MemberAccessor(new_call, "x");
}
auto coords_index = signature.IndexOf(sem::ParameterUsage::kCoords);
if (coords_index == -1) {
return nullptr;
}
utils::Vector<const ast::Expression*, 8> args;
int index = 0;
for (auto* arg : c->args) {
if (index == coords_index) {
auto* ctype = call->Arguments()[static_cast<size_t>(coords_index)]->Type();
auto* coords = c->args[static_cast<size_t>(coords_index)];
const ast::LiteralExpression* half = nullptr;
if (ctype->is_integer_scalar()) {
half = ctx.dst->Expr(0_a);
} else {
half = ctx.dst->Expr(0.5_a);
}
args.Push(
ctx.dst->vec(CreateASTTypeFor(ctx, ctype), 2u, ctx.Clone(coords), half));
} else {
args.Push(ctx.Clone(arg));
}
index++;
}
return ctx.dst->Call(ctx.Clone(c->target), args);
});
ctx.Clone();
return Program(std::move(b));
}
};
Texture1DTo2D::Texture1DTo2D() = default;
Texture1DTo2D::~Texture1DTo2D() = default;
Transform::ApplyResult Texture1DTo2D::Apply(const Program* src, const DataMap&, DataMap&) const {
return State(src).Run();
}
} // namespace tint::transform