src/tint/lang/wgsl/ast/transform/multiplanar_external_texture_fuzz.cc

// Copyright 2024 The Dawn & Tint Authors
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#include "src/tint/api/common/binding_point.h"
#include "src/tint/cmd/fuzz/wgsl/fuzz.h"
#include "src/tint/lang/core/type/external_texture.h"
#include "src/tint/lang/wgsl/ast/module.h"
#include "src/tint/lang/wgsl/ast/transform/multiplanar_external_texture.h"
#include "src/tint/lang/wgsl/sem/variable.h"

namespace tint::ast::transform {
namespace {

bool CanRun(const Program& program,
            const fuzz::wgsl::Context& context,
            const MultiplanarExternalTexture::NewBindingPoints& remappings) {
    if (context.program_properties.Contains(fuzz::wgsl::ProgramProperties::kBuiltinFnsShadowed) ||
        context.program_properties.Contains(fuzz::wgsl::ProgramProperties::kBuiltinTypesShadowed)) {
        return false;  // MultiplanarExternalTexture assumes the Renamer transform has been run
    }

    Hashset<BindingPoint, 8> all_binding_points;
    for (auto* global : program.AST().GlobalVariables()) {
        if (auto* sem = program.Sem().Get<sem::GlobalVariable>(global)) {
            if (auto binding_point = sem->Attributes().binding_point) {
                if (sem->Type()->UnwrapPtrOrRef()->Is<core::type::ExternalTexture>() &&
                    remappings.bindings_map.find(binding_point.value()) ==
                        remappings.bindings_map.end()) {
                    // Missing entry for external texture
                    return false;
                }

                all_binding_points.Add(binding_point.value());
            }
        }
    }

    if (!remappings.allow_collisions) {
        for (auto* global : program.AST().GlobalVariables()) {
            if (auto* sem = program.Sem().Get<sem::GlobalVariable>(global)) {
                if (auto binding_point = sem->Attributes().binding_point) {
                    all_binding_points.Add(binding_point.value());
                }
            }
        }
        Hashset<BindingPoint, 8> new_binding_points;
        for (auto& remapping : remappings.bindings_map) {
            if (all_binding_points.Remove(remapping.first)) {
                if (!new_binding_points.Add(remapping.second.params)) {
                    return false;  // Binding collision
                }
                if (!new_binding_points.Add(remapping.second.plane_1)) {
                    return false;  // Binding collision
                }
            }
        }
        for (auto& binding_point : new_binding_points) {
            if (!all_binding_points.Add(binding_point)) {
                return false;  // Binding collision
            }
        }
    }
    return true;
}

void MultiplanarExternalTextureFuzzer(
    const Program& program,
    const fuzz::wgsl::Context& context,
    const MultiplanarExternalTexture::NewBindingPoints& binding_points) {
    if (!CanRun(program, context, binding_points)) {
        return;
    }

    DataMap inputs;
    inputs.Add<MultiplanarExternalTexture::NewBindingPoints>(std::move(binding_points));

    DataMap outputs;
    if (auto result = MultiplanarExternalTexture{}.Apply(program, inputs, outputs)) {
        if (!result->IsValid()) {
            TINT_ICE() << "MultiplanarExternalTexture returned invalid program:\n"
                       << Program::printer(*result) << "\n"
                       << result->Diagnostics();
        }
    }
}

}  // namespace
}  // namespace tint::ast::transform

TINT_WGSL_PROGRAM_FUZZER(tint::ast::transform::MultiplanarExternalTextureFuzzer);