| /// Copyright 2021 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/writer/glsl/generator_impl.h" |
| |
| #include <algorithm> |
| #include <cmath> |
| #include <iomanip> |
| #include <limits> |
| #include <set> |
| #include <utility> |
| #include <vector> |
| |
| #include "src/tint/ast/call_statement.h" |
| #include "src/tint/ast/id_attribute.h" |
| #include "src/tint/ast/internal_attribute.h" |
| #include "src/tint/ast/interpolate_attribute.h" |
| #include "src/tint/ast/variable_decl_statement.h" |
| #include "src/tint/constant/value.h" |
| #include "src/tint/debug.h" |
| #include "src/tint/sem/block_statement.h" |
| #include "src/tint/sem/call.h" |
| #include "src/tint/sem/function.h" |
| #include "src/tint/sem/member_accessor_expression.h" |
| #include "src/tint/sem/module.h" |
| #include "src/tint/sem/statement.h" |
| #include "src/tint/sem/struct.h" |
| #include "src/tint/sem/switch_statement.h" |
| #include "src/tint/sem/value_constructor.h" |
| #include "src/tint/sem/value_conversion.h" |
| #include "src/tint/sem/variable.h" |
| #include "src/tint/switch.h" |
| #include "src/tint/transform/add_block_attribute.h" |
| #include "src/tint/transform/add_empty_entry_point.h" |
| #include "src/tint/transform/binding_remapper.h" |
| #include "src/tint/transform/builtin_polyfill.h" |
| #include "src/tint/transform/canonicalize_entry_point_io.h" |
| #include "src/tint/transform/combine_samplers.h" |
| #include "src/tint/transform/decompose_memory_access.h" |
| #include "src/tint/transform/demote_to_helper.h" |
| #include "src/tint/transform/direct_variable_access.h" |
| #include "src/tint/transform/disable_uniformity_analysis.h" |
| #include "src/tint/transform/expand_compound_assignment.h" |
| #include "src/tint/transform/manager.h" |
| #include "src/tint/transform/multiplanar_external_texture.h" |
| #include "src/tint/transform/pad_structs.h" |
| #include "src/tint/transform/preserve_padding.h" |
| #include "src/tint/transform/promote_initializers_to_let.h" |
| #include "src/tint/transform/promote_side_effects_to_decl.h" |
| #include "src/tint/transform/remove_phonies.h" |
| #include "src/tint/transform/renamer.h" |
| #include "src/tint/transform/robustness.h" |
| #include "src/tint/transform/simplify_pointers.h" |
| #include "src/tint/transform/single_entry_point.h" |
| #include "src/tint/transform/std140.h" |
| #include "src/tint/transform/texture_1d_to_2d.h" |
| #include "src/tint/transform/unshadow.h" |
| #include "src/tint/transform/zero_init_workgroup_memory.h" |
| #include "src/tint/type/array.h" |
| #include "src/tint/type/atomic.h" |
| #include "src/tint/type/depth_multisampled_texture.h" |
| #include "src/tint/type/depth_texture.h" |
| #include "src/tint/type/multisampled_texture.h" |
| #include "src/tint/type/sampled_texture.h" |
| #include "src/tint/type/storage_texture.h" |
| #include "src/tint/type/texture_dimension.h" |
| #include "src/tint/utils/defer.h" |
| #include "src/tint/utils/map.h" |
| #include "src/tint/utils/scoped_assignment.h" |
| #include "src/tint/utils/string.h" |
| #include "src/tint/utils/string_stream.h" |
| #include "src/tint/writer/append_vector.h" |
| #include "src/tint/writer/float_to_string.h" |
| |
| using namespace tint::number_suffixes; // NOLINT |
| |
| namespace tint::writer::glsl { |
| namespace { |
| |
| const char kTempNamePrefix[] = "tint_tmp"; |
| |
| bool last_is_break(const ast::BlockStatement* stmts) { |
| return IsAnyOf<ast::BreakStatement>(stmts->Last()); |
| } |
| |
| bool IsRelational(tint::ast::BinaryOp op) { |
| return op == tint::ast::BinaryOp::kEqual || op == tint::ast::BinaryOp::kNotEqual || |
| op == tint::ast::BinaryOp::kLessThan || op == tint::ast::BinaryOp::kGreaterThan || |
| op == tint::ast::BinaryOp::kLessThanEqual || |
| op == tint::ast::BinaryOp::kGreaterThanEqual; |
| } |
| |
| bool RequiresOESSampleVariables(tint::builtin::BuiltinValue builtin) { |
| switch (builtin) { |
| case tint::builtin::BuiltinValue::kSampleIndex: |
| case tint::builtin::BuiltinValue::kSampleMask: |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| void PrintI32(utils::StringStream& out, int32_t value) { |
| // GLSL parses `-2147483648` as a unary minus and `2147483648` as separate tokens, and the |
| // latter doesn't fit into an (32-bit) `int`. Emit `(-2147483647 - 1)` instead, which ensures |
| // the expression type is `int`. |
| if (auto int_min = std::numeric_limits<int32_t>::min(); value == int_min) { |
| out << "(" << int_min + 1 << " - 1)"; |
| } else { |
| out << value; |
| } |
| } |
| |
| void PrintF32(utils::StringStream& out, float value) { |
| if (std::isinf(value)) { |
| out << "0.0f " << (value >= 0 ? "/* inf */" : "/* -inf */"); |
| } else if (std::isnan(value)) { |
| out << "0.0f /* nan */"; |
| } else { |
| out << FloatToString(value) << "f"; |
| } |
| } |
| |
| void PrintF16(utils::StringStream& out, float value) { |
| if (std::isinf(value)) { |
| out << "0.0hf " << (value >= 0 ? "/* inf */" : "/* -inf */"); |
| } else if (std::isnan(value)) { |
| out << "0.0hf /* nan */"; |
| } else { |
| out << FloatToString(value) << "hf"; |
| } |
| } |
| |
| } // namespace |
| |
| SanitizedResult::SanitizedResult() = default; |
| SanitizedResult::~SanitizedResult() = default; |
| SanitizedResult::SanitizedResult(SanitizedResult&&) = default; |
| |
| SanitizedResult Sanitize(const Program* in, |
| const Options& options, |
| const std::string& entry_point) { |
| transform::Manager manager; |
| transform::DataMap data; |
| |
| manager.Add<transform::DisableUniformityAnalysis>(); |
| |
| // ExpandCompoundAssignment must come before BuiltinPolyfill |
| manager.Add<transform::ExpandCompoundAssignment>(); |
| |
| if (!entry_point.empty()) { |
| manager.Add<transform::SingleEntryPoint>(); |
| data.Add<transform::SingleEntryPoint::Config>(entry_point); |
| } |
| manager.Add<transform::Renamer>(); |
| data.Add<transform::Renamer::Config>(transform::Renamer::Target::kGlslKeywords, |
| /* preserve_unicode */ false); |
| |
| manager.Add<transform::PreservePadding>(); // Must come before DirectVariableAccess |
| |
| manager.Add<transform::Unshadow>(); // Must come before DirectVariableAccess |
| manager.Add<transform::DirectVariableAccess>(); |
| |
| manager.Add<transform::PromoteSideEffectsToDecl>(); |
| |
| if (!options.disable_robustness) { |
| // Robustness must come after PromoteSideEffectsToDecl |
| // Robustness must come before BuiltinPolyfill and CanonicalizeEntryPointIO |
| manager.Add<transform::Robustness>(); |
| } |
| |
| // Note: it is more efficient for MultiplanarExternalTexture to come after Robustness |
| data.Add<transform::MultiplanarExternalTexture::NewBindingPoints>( |
| options.external_texture_options.bindings_map); |
| manager.Add<transform::MultiplanarExternalTexture>(); |
| |
| { // Builtin polyfills |
| transform::BuiltinPolyfill::Builtins polyfills; |
| polyfills.acosh = transform::BuiltinPolyfill::Level::kRangeCheck; |
| polyfills.atanh = transform::BuiltinPolyfill::Level::kRangeCheck; |
| polyfills.bgra8unorm = true; |
| polyfills.bitshift_modulo = true; |
| polyfills.conv_f32_to_iu32 = true; |
| polyfills.count_leading_zeros = true; |
| polyfills.count_trailing_zeros = true; |
| polyfills.extract_bits = transform::BuiltinPolyfill::Level::kClampParameters; |
| polyfills.first_leading_bit = true; |
| polyfills.first_trailing_bit = true; |
| polyfills.insert_bits = transform::BuiltinPolyfill::Level::kClampParameters; |
| polyfills.int_div_mod = true; |
| polyfills.saturate = true; |
| polyfills.texture_sample_base_clamp_to_edge_2d_f32 = true; |
| polyfills.workgroup_uniform_load = true; |
| data.Add<transform::BuiltinPolyfill::Config>(polyfills); |
| manager.Add<transform::BuiltinPolyfill>(); |
| } |
| |
| if (!options.disable_workgroup_init) { |
| // ZeroInitWorkgroupMemory must come before CanonicalizeEntryPointIO as |
| // ZeroInitWorkgroupMemory may inject new builtin parameters. |
| manager.Add<transform::ZeroInitWorkgroupMemory>(); |
| } |
| |
| // CanonicalizeEntryPointIO must come after Robustness |
| manager.Add<transform::CanonicalizeEntryPointIO>(); |
| |
| // PadStructs must come after CanonicalizeEntryPointIO |
| manager.Add<transform::PadStructs>(); |
| |
| // DemoteToHelper must come after PromoteSideEffectsToDecl and ExpandCompoundAssignment. |
| manager.Add<transform::DemoteToHelper>(); |
| |
| manager.Add<transform::RemovePhonies>(); |
| |
| data.Add<transform::CombineSamplers::BindingInfo>(options.binding_map, |
| options.placeholder_binding_point); |
| manager.Add<transform::CombineSamplers>(); |
| |
| data.Add<transform::BindingRemapper::Remappings>( |
| options.binding_points, options.access_controls, options.allow_collisions); |
| manager.Add<transform::BindingRemapper>(); |
| |
| manager.Add<transform::PromoteInitializersToLet>(); |
| manager.Add<transform::AddEmptyEntryPoint>(); |
| manager.Add<transform::AddBlockAttribute>(); |
| |
| // Std140 must come after PromoteSideEffectsToDecl and before SimplifyPointers. |
| manager.Add<transform::Std140>(); |
| |
| manager.Add<transform::Texture1DTo2D>(); |
| |
| manager.Add<transform::SimplifyPointers>(); |
| |
| data.Add<transform::CanonicalizeEntryPointIO::Config>( |
| transform::CanonicalizeEntryPointIO::ShaderStyle::kGlsl); |
| |
| auto out = manager.Run(in, data); |
| |
| SanitizedResult result; |
| result.program = std::move(out.program); |
| return result; |
| } |
| |
| GeneratorImpl::GeneratorImpl(const Program* program, const Version& version) |
| : TextGenerator(program), version_(version) {} |
| |
| GeneratorImpl::~GeneratorImpl() = default; |
| |
| bool GeneratorImpl::Generate() { |
| { |
| auto out = line(); |
| out << "#version " << version_.major_version << version_.minor_version << "0"; |
| if (version_.IsES()) { |
| out << " es"; |
| } |
| } |
| |
| auto helpers_insertion_point = current_buffer_->lines.size(); |
| |
| line(); |
| |
| auto* mod = builder_.Sem().Module(); |
| for (auto* decl : mod->DependencyOrderedDeclarations()) { |
| if (decl->IsAnyOf<ast::Alias, ast::ConstAssert, ast::DiagnosticDirective>()) { |
| continue; // These are not emitted. |
| } |
| |
| bool ok = Switch( |
| decl, // |
| [&](const ast::Variable* global) { return EmitGlobalVariable(global); }, |
| [&](const ast::Struct* str) { |
| auto* sem = builder_.Sem().Get(str); |
| bool has_rt_arr = false; |
| if (auto* arr = sem->Members().Back()->Type()->As<type::Array>()) { |
| has_rt_arr = arr->Count()->Is<type::RuntimeArrayCount>(); |
| } |
| bool is_block = ast::HasAttribute<transform::AddBlockAttribute::BlockAttribute>( |
| str->attributes); |
| if (!has_rt_arr && !is_block) { |
| if (!EmitStructType(current_buffer_, sem)) { |
| return false; |
| } |
| } |
| return true; |
| }, |
| [&](const ast::Function* func) { |
| if (func->IsEntryPoint()) { |
| return EmitEntryPointFunction(func); |
| } |
| return EmitFunction(func); |
| }, |
| [&](const ast::Enable* enable) { |
| // Record the required extension for generating extension directive later |
| return RecordExtension(enable); |
| }, |
| [&](Default) { |
| TINT_ICE(Writer, diagnostics_) |
| << "unhandled module-scope declaration: " << decl->TypeInfo().name; |
| return false; |
| }); |
| |
| if (TINT_UNLIKELY(!ok)) { |
| return false; |
| } |
| } |
| |
| TextBuffer extensions; |
| |
| if (version_.IsES() && requires_oes_sample_variables_) { |
| extensions.Append("#extension GL_OES_sample_variables : require"); |
| } |
| |
| if (requires_f16_extension_) { |
| extensions.Append("#extension GL_AMD_gpu_shader_half_float : require"); |
| } |
| |
| auto indent = current_buffer_->current_indent; |
| |
| if (!extensions.lines.empty()) { |
| current_buffer_->Insert(extensions, helpers_insertion_point, indent); |
| helpers_insertion_point += extensions.lines.size(); |
| } |
| |
| if (version_.IsES() && requires_default_precision_qualifier_) { |
| current_buffer_->Insert("precision highp float;", helpers_insertion_point++, indent); |
| } |
| |
| if (!helpers_.lines.empty()) { |
| current_buffer_->Insert("", helpers_insertion_point++, indent); |
| current_buffer_->Insert(helpers_, helpers_insertion_point, indent); |
| helpers_insertion_point += helpers_.lines.size(); |
| } |
| |
| return true; |
| } |
| |
| bool GeneratorImpl::RecordExtension(const ast::Enable* enable) { |
| // Deal with extension node here, recording it within the generator for later emition. |
| |
| if (enable->HasExtension(builtin::Extension::kF16)) { |
| requires_f16_extension_ = true; |
| } |
| |
| return true; |
| } |
| |
| bool GeneratorImpl::EmitIndexAccessor(utils::StringStream& out, |
| const ast::IndexAccessorExpression* expr) { |
| if (!EmitExpression(out, expr->object)) { |
| return false; |
| } |
| out << "["; |
| |
| if (!EmitExpression(out, expr->index)) { |
| return false; |
| } |
| out << "]"; |
| |
| return true; |
| } |
| |
| bool GeneratorImpl::EmitBitcast(utils::StringStream& out, const ast::BitcastExpression* expr) { |
| auto* src_type = TypeOf(expr->expr)->UnwrapRef(); |
| auto* dst_type = TypeOf(expr)->UnwrapRef(); |
| |
| if (!dst_type->is_integer_scalar_or_vector() && !dst_type->is_float_scalar_or_vector()) { |
| diagnostics_.add_error( |
| diag::System::Writer, |
| "Unable to do bitcast to type " + dst_type->FriendlyName(builder_.Symbols())); |
| return false; |
| } |
| |
| if (src_type == dst_type) { |
| return EmitExpression(out, expr->expr); |
| } |
| |
| if (src_type->is_float_scalar_or_vector() && dst_type->is_signed_integer_scalar_or_vector()) { |
| out << "floatBitsToInt"; |
| } else if (src_type->is_float_scalar_or_vector() && |
| dst_type->is_unsigned_integer_scalar_or_vector()) { |
| out << "floatBitsToUint"; |
| } else if (src_type->is_signed_integer_scalar_or_vector() && |
| dst_type->is_float_scalar_or_vector()) { |
| out << "intBitsToFloat"; |
| } else if (src_type->is_unsigned_integer_scalar_or_vector() && |
| dst_type->is_float_scalar_or_vector()) { |
| out << "uintBitsToFloat"; |
| } else { |
| if (!EmitType(out, dst_type, builtin::AddressSpace::kUndefined, builtin::Access::kReadWrite, |
| "")) { |
| return false; |
| } |
| } |
| ScopedParen sp(out); |
| if (!EmitExpression(out, expr->expr)) { |
| return false; |
| } |
| return true; |
| } |
| |
| bool GeneratorImpl::EmitAssign(const ast::AssignmentStatement* stmt) { |
| auto out = line(); |
| if (!EmitExpression(out, stmt->lhs)) { |
| return false; |
| } |
| out << " = "; |
| if (!EmitExpression(out, stmt->rhs)) { |
| return false; |
| } |
| out << ";"; |
| return true; |
| } |
| |
| bool GeneratorImpl::EmitVectorRelational(utils::StringStream& out, |
| const ast::BinaryExpression* expr) { |
| switch (expr->op) { |
| case ast::BinaryOp::kEqual: |
| out << "equal"; |
| break; |
| case ast::BinaryOp::kNotEqual: |
| out << "notEqual"; |
| break; |
| case ast::BinaryOp::kLessThan: |
| out << "lessThan"; |
| break; |
| case ast::BinaryOp::kGreaterThan: |
| out << "greaterThan"; |
| break; |
| case ast::BinaryOp::kLessThanEqual: |
| out << "lessThanEqual"; |
| break; |
| case ast::BinaryOp::kGreaterThanEqual: |
| out << "greaterThanEqual"; |
| break; |
| default: |
| break; |
| } |
| ScopedParen sp(out); |
| if (!EmitExpression(out, expr->lhs)) { |
| return false; |
| } |
| out << ", "; |
| if (!EmitExpression(out, expr->rhs)) { |
| return false; |
| } |
| return true; |
| } |
| |
| bool GeneratorImpl::EmitBitwiseBoolOp(utils::StringStream& out, const ast::BinaryExpression* expr) { |
| auto* bool_type = TypeOf(expr->lhs)->UnwrapRef(); |
| auto* uint_type = BoolTypeToUint(bool_type); |
| |
| // Cast result to bool scalar or vector type. |
| if (!EmitType(out, bool_type, builtin::AddressSpace::kUndefined, builtin::Access::kReadWrite, |
| "")) { |
| return false; |
| } |
| ScopedParen outerCastParen(out); |
| // Cast LHS to uint scalar or vector type. |
| if (!EmitType(out, uint_type, builtin::AddressSpace::kUndefined, builtin::Access::kReadWrite, |
| "")) { |
| return false; |
| } |
| { |
| ScopedParen innerCastParen(out); |
| // Emit LHS. |
| if (!EmitExpression(out, expr->lhs)) { |
| return false; |
| } |
| } |
| // Emit operator. |
| if (expr->op == ast::BinaryOp::kAnd) { |
| out << " & "; |
| } else if (TINT_LIKELY(expr->op == ast::BinaryOp::kOr)) { |
| out << " | "; |
| } else { |
| TINT_ICE(Writer, diagnostics_) << "unexpected binary op: " << FriendlyName(expr->op); |
| return false; |
| } |
| // Cast RHS to uint scalar or vector type. |
| if (!EmitType(out, uint_type, builtin::AddressSpace::kUndefined, builtin::Access::kReadWrite, |
| "")) { |
| return false; |
| } |
| { |
| ScopedParen innerCastParen(out); |
| // Emit RHS. |
| if (!EmitExpression(out, expr->rhs)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| bool GeneratorImpl::EmitFloatModulo(utils::StringStream& out, const ast::BinaryExpression* expr) { |
| std::string fn; |
| auto* ret_ty = TypeOf(expr)->UnwrapRef(); |
| auto* lhs_ty = TypeOf(expr->lhs)->UnwrapRef(); |
| auto* rhs_ty = TypeOf(expr->rhs)->UnwrapRef(); |
| fn = utils::GetOrCreate( |
| float_modulo_funcs_, BinaryOperandType{{lhs_ty, rhs_ty}}, [&]() -> std::string { |
| TextBuffer b; |
| TINT_DEFER(helpers_.Append(b)); |
| |
| auto fn_name = UniqueIdentifier("tint_float_modulo"); |
| std::vector<std::string> parameter_names; |
| { |
| auto decl = line(&b); |
| if (!EmitTypeAndName(decl, ret_ty, builtin::AddressSpace::kUndefined, |
| builtin::Access::kUndefined, fn_name)) { |
| return ""; |
| } |
| { |
| ScopedParen sp(decl); |
| const auto* ty = TypeOf(expr->lhs)->UnwrapRef(); |
| if (!EmitTypeAndName(decl, ty, builtin::AddressSpace::kUndefined, |
| builtin::Access::kUndefined, "lhs")) { |
| return ""; |
| } |
| decl << ", "; |
| ty = TypeOf(expr->rhs)->UnwrapRef(); |
| if (!EmitTypeAndName(decl, ty, builtin::AddressSpace::kUndefined, |
| builtin::Access::kUndefined, "rhs")) { |
| return ""; |
| } |
| } |
| decl << " {"; |
| } |
| { |
| ScopedIndent si(&b); |
| line(&b) << "return (lhs - rhs * trunc(lhs / rhs));"; |
| } |
| line(&b) << "}"; |
| line(&b); |
| return fn_name; |
| }); |
| |
| if (fn.empty()) { |
| return false; |
| } |
| |
| // Call the helper |
| out << fn; |
| { |
| ScopedParen sp(out); |
| if (!EmitExpression(out, expr->lhs)) { |
| return false; |
| } |
| out << ", "; |
| if (!EmitExpression(out, expr->rhs)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| bool GeneratorImpl::EmitBinary(utils::StringStream& out, const ast::BinaryExpression* expr) { |
| if (IsRelational(expr->op) && !TypeOf(expr->lhs)->UnwrapRef()->is_scalar()) { |
| return EmitVectorRelational(out, expr); |
| } |
| if (expr->op == ast::BinaryOp::kLogicalAnd || expr->op == ast::BinaryOp::kLogicalOr) { |
| auto name = UniqueIdentifier(kTempNamePrefix); |
| |
| { |
| auto pre = line(); |
| pre << "bool " << name << " = "; |
| if (!EmitExpression(pre, expr->lhs)) { |
| return false; |
| } |
| pre << ";"; |
| } |
| |
| if (expr->op == ast::BinaryOp::kLogicalOr) { |
| line() << "if (!" << name << ") {"; |
| } else { |
| line() << "if (" << name << ") {"; |
| } |
| |
| { |
| ScopedIndent si(this); |
| auto pre = line(); |
| pre << name << " = "; |
| if (!EmitExpression(pre, expr->rhs)) { |
| return false; |
| } |
| pre << ";"; |
| } |
| |
| line() << "}"; |
| |
| out << "(" << name << ")"; |
| return true; |
| } |
| if ((expr->op == ast::BinaryOp::kAnd || expr->op == ast::BinaryOp::kOr) && |
| TypeOf(expr->lhs)->UnwrapRef()->is_bool_scalar_or_vector()) { |
| return EmitBitwiseBoolOp(out, expr); |
| } |
| |
| if (expr->op == ast::BinaryOp::kModulo && |
| (TypeOf(expr->lhs)->UnwrapRef()->is_float_scalar_or_vector() || |
| TypeOf(expr->rhs)->UnwrapRef()->is_float_scalar_or_vector())) { |
| return EmitFloatModulo(out, expr); |
| } |
| |
| ScopedParen sp(out); |
| if (!EmitExpression(out, expr->lhs)) { |
| return false; |
| } |
| out << " "; |
| |
| switch (expr->op) { |
| case ast::BinaryOp::kAnd: |
| out << "&"; |
| break; |
| case ast::BinaryOp::kOr: |
| out << "|"; |
| break; |
| case ast::BinaryOp::kXor: |
| out << "^"; |
| break; |
| case ast::BinaryOp::kLogicalAnd: |
| case ast::BinaryOp::kLogicalOr: { |
| // These are both handled above. |
| TINT_UNREACHABLE(Writer, diagnostics_); |
| return false; |
| } |
| case ast::BinaryOp::kEqual: |
| out << "=="; |
| break; |
| case ast::BinaryOp::kNotEqual: |
| out << "!="; |
| break; |
| case ast::BinaryOp::kLessThan: |
| out << "<"; |
| break; |
| case ast::BinaryOp::kGreaterThan: |
| out << ">"; |
| break; |
| case ast::BinaryOp::kLessThanEqual: |
| out << "<="; |
| break; |
| case ast::BinaryOp::kGreaterThanEqual: |
| out << ">="; |
| break; |
| case ast::BinaryOp::kShiftLeft: |
| out << "<<"; |
| break; |
| case ast::BinaryOp::kShiftRight: |
| // TODO(dsinclair): MSL is based on C++14, and >> in C++14 has |
| // implementation-defined behaviour for negative LHS. We may have to |
| // generate extra code to implement WGSL-specified behaviour for negative |
| // LHS. |
| out << R"(>>)"; |
| break; |
| |
| case ast::BinaryOp::kAdd: |
| out << "+"; |
| break; |
| case ast::BinaryOp::kSubtract: |
| out << "-"; |
| break; |
| case ast::BinaryOp::kMultiply: |
| out << "*"; |
| break; |
| case ast::BinaryOp::kDivide: |
| out << "/"; |
| break; |
| case ast::BinaryOp::kModulo: |
| out << "%"; |
| break; |
| case ast::BinaryOp::kNone: |
| diagnostics_.add_error(diag::System::Writer, "missing binary operation type"); |
| return false; |
| } |
| out << " "; |
| |
| if (!EmitExpression(out, expr->rhs)) { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| bool GeneratorImpl::EmitStatements(utils::VectorRef<const ast::Statement*> stmts) { |
| for (auto* s : stmts) { |
| if (!EmitStatement(s)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| bool GeneratorImpl::EmitStatementsWithIndent(utils::VectorRef<const ast::Statement*> stmts) { |
| ScopedIndent si(this); |
| return EmitStatements(stmts); |
| } |
| |
| bool GeneratorImpl::EmitBlock(const ast::BlockStatement* stmt) { |
| line() << "{"; |
| if (!EmitStatementsWithIndent(stmt->statements)) { |
| return false; |
| } |
| line() << "}"; |
| return true; |
| } |
| |
| bool GeneratorImpl::EmitBreak(const ast::BreakStatement*) { |
| line() << "break;"; |
| return true; |
| } |
| |
| bool GeneratorImpl::EmitBreakIf(const ast::BreakIfStatement* b) { |
| auto out = line(); |
| out << "if ("; |
| if (!EmitExpression(out, b->condition)) { |
| return false; |
| } |
| out << ") { break; }"; |
| return true; |
| } |
| |
| bool GeneratorImpl::EmitCall(utils::StringStream& out, const ast::CallExpression* expr) { |
| auto* call = builder_.Sem().Get<sem::Call>(expr); |
| return Switch( |
| call->Target(), // |
| [&](const sem::Function* fn) { return EmitFunctionCall(out, call, fn); }, |
| [&](const sem::Builtin* builtin) { return EmitBuiltinCall(out, call, builtin); }, |
| [&](const sem::ValueConversion* conv) { return EmitValueConversion(out, call, conv); }, |
| [&](const sem::ValueConstructor* ctor) { return EmitValueConstructor(out, call, ctor); }, |
| [&](Default) { |
| TINT_ICE(Writer, diagnostics_) |
| << "unhandled call target: " << call->Target()->TypeInfo().name; |
| return false; |
| }); |
| } |
| |
| bool GeneratorImpl::EmitFunctionCall(utils::StringStream& out, |
| const sem::Call* call, |
| const sem::Function* fn) { |
| const auto& args = call->Arguments(); |
| auto* ident = fn->Declaration()->name; |
| |
| out << builder_.Symbols().NameFor(ident->symbol); |
| ScopedParen sp(out); |
| |
| bool first = true; |
| for (auto* arg : args) { |
| if (!first) { |
| out << ", "; |
| } |
| first = false; |
| |
| if (!EmitExpression(out, arg->Declaration())) { |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| bool GeneratorImpl::EmitBuiltinCall(utils::StringStream& out, |
| const sem::Call* call, |
| const sem::Builtin* builtin) { |
| auto* expr = call->Declaration(); |
| if (builtin->IsTexture()) { |
| return EmitTextureCall(out, call, builtin); |
| } |
| if (builtin->Type() == builtin::Function::kCountOneBits) { |
| return EmitCountOneBitsCall(out, expr); |
| } |
| if (builtin->Type() == builtin::Function::kSelect) { |
| return EmitSelectCall(out, expr, builtin); |
| } |
| if (builtin->Type() == builtin::Function::kDot) { |
| return EmitDotCall(out, expr, builtin); |
| } |
| if (builtin->Type() == builtin::Function::kModf) { |
| return EmitModfCall(out, expr, builtin); |
| } |
| if (builtin->Type() == builtin::Function::kFrexp) { |
| return EmitFrexpCall(out, expr, builtin); |
| } |
| if (builtin->Type() == builtin::Function::kDegrees) { |
| return EmitDegreesCall(out, expr, builtin); |
| } |
| if (builtin->Type() == builtin::Function::kRadians) { |
| return EmitRadiansCall(out, expr, builtin); |
| } |
| if (builtin->Type() == builtin::Function::kQuantizeToF16) { |
| return EmitQuantizeToF16Call(out, expr, builtin); |
| } |
| if (builtin->Type() == builtin::Function::kArrayLength) { |
| return EmitArrayLength(out, expr); |
| } |
| if (builtin->Type() == builtin::Function::kExtractBits) { |
| return EmitExtractBits(out, expr); |
| } |
| if (builtin->Type() == builtin::Function::kInsertBits) { |
| return EmitInsertBits(out, expr); |
| } |
| if (builtin->Type() == builtin::Function::kFma && version_.IsES()) { |
| return EmitEmulatedFMA(out, expr); |
| } |
| if (builtin->Type() == builtin::Function::kAbs && |
| TypeOf(expr->args[0])->UnwrapRef()->is_unsigned_integer_scalar_or_vector()) { |
| // GLSL does not support abs() on unsigned arguments. However, it's a no-op. |
| return EmitExpression(out, expr->args[0]); |
| } |
| if ((builtin->Type() == builtin::Function::kAny || |
| builtin->Type() == builtin::Function::kAll) && |
| TypeOf(expr->args[0])->UnwrapRef()->is_scalar()) { |
| // GLSL does not support any() or all() on scalar arguments. It's a no-op. |
| return EmitExpression(out, expr->args[0]); |
| } |
| if (builtin->IsBarrier()) { |
| return EmitBarrierCall(out, builtin); |
| } |
| if (builtin->IsAtomic()) { |
| return EmitWorkgroupAtomicCall(out, expr, builtin); |
| } |
| auto name = generate_builtin_name(builtin); |
| if (name.empty()) { |
| return false; |
| } |
| |
| out << name; |
| ScopedParen sp(out); |
| |
| bool first = true; |
| for (auto* arg : call->Arguments()) { |
| if (!first) { |
| out << ", "; |
| } |
| first = false; |
| |
| if (!EmitExpression(out, arg->Declaration())) { |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| bool GeneratorImpl::EmitValueConversion(utils::StringStream& out, |
| const sem::Call* call, |
| const sem::ValueConversion* conv) { |
| if (!EmitType(out, conv->Target(), builtin::AddressSpace::kUndefined, |
| builtin::Access::kReadWrite, "")) { |
| return false; |
| } |
| ScopedParen sp(out); |
| |
| if (!EmitExpression(out, call->Arguments()[0]->Declaration())) { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| bool GeneratorImpl::EmitValueConstructor(utils::StringStream& out, |
| const sem::Call* call, |
| const sem::ValueConstructor* ctor) { |
| auto* type = ctor->ReturnType(); |
| |
| // If the value constructor is empty then we need to construct with the zero value for all |
| // components. |
| if (call->Arguments().IsEmpty()) { |
| return EmitZeroValue(out, type); |
| } |
| |
| if (!EmitType(out, type, builtin::AddressSpace::kUndefined, builtin::Access::kReadWrite, "")) { |
| return false; |
| } |
| ScopedParen sp(out); |
| |
| bool first = true; |
| for (auto* arg : call->Arguments()) { |
| if (!first) { |
| out << ", "; |
| } |
| first = false; |
| |
| if (!EmitExpression(out, arg->Declaration())) { |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| bool GeneratorImpl::EmitWorkgroupAtomicCall(utils::StringStream& out, |
| const ast::CallExpression* expr, |
| const sem::Builtin* builtin) { |
| auto call = [&](const char* name) { |
| out << name; |
| { |
| ScopedParen sp(out); |
| for (size_t i = 0; i < expr->args.Length(); i++) { |
| auto* arg = expr->args[i]; |
| if (i > 0) { |
| out << ", "; |
| } |
| if (!EmitExpression(out, arg)) { |
| return false; |
| } |
| } |
| } |
| return true; |
| }; |
| |
| switch (builtin->Type()) { |
| case builtin::Function::kAtomicLoad: { |
| // GLSL does not have an atomicLoad, so we emulate it with |
| // atomicOr using 0 as the OR value |
| out << "atomicOr"; |
| { |
| ScopedParen sp(out); |
| if (!EmitExpression(out, expr->args[0])) { |
| return false; |
| } |
| out << ", 0"; |
| if (builtin->ReturnType()->Is<type::U32>()) { |
| out << "u"; |
| } |
| } |
| return true; |
| } |
| case builtin::Function::kAtomicCompareExchangeWeak: { |
| if (!EmitStructType(&helpers_, builtin->ReturnType()->As<sem::Struct>())) { |
| return false; |
| } |
| |
| auto* dest = expr->args[0]; |
| auto* compare_value = expr->args[1]; |
| auto* value = expr->args[2]; |
| |
| std::string result = UniqueIdentifier("atomic_compare_result"); |
| |
| { |
| auto pre = line(); |
| if (!EmitTypeAndName(pre, builtin->ReturnType(), builtin::AddressSpace::kUndefined, |
| builtin::Access::kUndefined, result)) { |
| return false; |
| } |
| pre << ";"; |
| } |
| { |
| auto pre = line(); |
| pre << result << ".old_value = atomicCompSwap"; |
| { |
| ScopedParen sp(pre); |
| if (!EmitExpression(pre, dest)) { |
| return false; |
| } |
| pre << ", "; |
| if (!EmitExpression(pre, compare_value)) { |
| return false; |
| } |
| pre << ", "; |
| if (!EmitExpression(pre, value)) { |
| return false; |
| } |
| } |
| pre << ";"; |
| } |
| { |
| auto pre = line(); |
| pre << result << ".exchanged = " << result << ".old_value == "; |
| if (!EmitExpression(pre, compare_value)) { |
| return false; |
| } |
| pre << ";"; |
| } |
| |
| out << result; |
| return true; |
| } |
| |
| case builtin::Function::kAtomicAdd: |
| case builtin::Function::kAtomicSub: |
| return call("atomicAdd"); |
| |
| case builtin::Function::kAtomicMax: |
| return call("atomicMax"); |
| |
| case builtin::Function::kAtomicMin: |
| return call("atomicMin"); |
| |
| case builtin::Function::kAtomicAnd: |
| return call("atomicAnd"); |
| |
| case builtin::Function::kAtomicOr: |
| return call("atomicOr"); |
| |
| case builtin::Function::kAtomicXor: |
| return call("atomicXor"); |
| |
| case builtin::Function::kAtomicExchange: |
| case builtin::Function::kAtomicStore: |
| // GLSL does not have an atomicStore, so we emulate it with |
| // atomicExchange. |
| return call("atomicExchange"); |
| |
| default: |
| break; |
| } |
| |
| TINT_UNREACHABLE(Writer, diagnostics_) << "unsupported atomic builtin: " << builtin->Type(); |
| return false; |
| } |
| |
| bool GeneratorImpl::EmitArrayLength(utils::StringStream& out, const ast::CallExpression* expr) { |
| out << "uint("; |
| if (!EmitExpression(out, expr->args[0])) { |
| return false; |
| } |
| out << ".length())"; |
| return true; |
| } |
| |
| bool GeneratorImpl::EmitExtractBits(utils::StringStream& out, const ast::CallExpression* expr) { |
| out << "bitfieldExtract("; |
| if (!EmitExpression(out, expr->args[0])) { |
| return false; |
| } |
| out << ", int("; |
| if (!EmitExpression(out, expr->args[1])) { |
| return false; |
| } |
| out << "), int("; |
| if (!EmitExpression(out, expr->args[2])) { |
| return false; |
| } |
| out << "))"; |
| return true; |
| } |
| |
| bool GeneratorImpl::EmitInsertBits(utils::StringStream& out, const ast::CallExpression* expr) { |
| out << "bitfieldInsert("; |
| if (!EmitExpression(out, expr->args[0])) { |
| return false; |
| } |
| out << ", "; |
| if (!EmitExpression(out, expr->args[1])) { |
| return false; |
| } |
| out << ", int("; |
| if (!EmitExpression(out, expr->args[2])) { |
| return false; |
| } |
| out << "), int("; |
| if (!EmitExpression(out, expr->args[3])) { |
| return false; |
| } |
| out << "))"; |
| return true; |
| } |
| |
| bool GeneratorImpl::EmitEmulatedFMA(utils::StringStream& out, const ast::CallExpression* expr) { |
| out << "(("; |
| if (!EmitExpression(out, expr->args[0])) { |
| return false; |
| } |
| out << ") * ("; |
| if (!EmitExpression(out, expr->args[1])) { |
| return false; |
| } |
| out << ") + ("; |
| if (!EmitExpression(out, expr->args[2])) { |
| return false; |
| } |
| out << "))"; |
| return true; |
| } |
| |
| bool GeneratorImpl::EmitCountOneBitsCall(utils::StringStream& out, |
| const ast::CallExpression* expr) { |
| // GLSL's bitCount returns an integer type, so cast it to the appropriate |
| // unsigned type. |
| if (!EmitType(out, TypeOf(expr)->UnwrapRef(), builtin::AddressSpace::kUndefined, |
| builtin::Access::kReadWrite, "")) { |
| return false; |
| } |
| out << "(bitCount("; |
| |
| if (!EmitExpression(out, expr->args[0])) { |
| return false; |
| } |
| out << "))"; |
| return true; |
| } |
| |
| bool GeneratorImpl::EmitSelectCall(utils::StringStream& out, |
| const ast::CallExpression* expr, |
| const sem::Builtin* builtin) { |
| // GLSL does not support ternary expressions with a bool vector conditional, |
| // so polyfill with a helper. |
| if (auto* vec = builtin->Parameters()[2]->Type()->As<type::Vector>()) { |
| return CallBuiltinHelper( |
| out, expr, builtin, [&](TextBuffer* b, const std::vector<std::string>& params) { |
| auto l = line(b); |
| l << " return "; |
| if (!EmitType(l, builtin->ReturnType(), builtin::AddressSpace::kUndefined, |
| builtin::Access::kUndefined, "")) { |
| return false; |
| } |
| { |
| ScopedParen sp(l); |
| for (uint32_t i = 0; i < vec->Width(); i++) { |
| if (i > 0) { |
| l << ", "; |
| } |
| l << params[2] << "[" << i << "] ? " << params[1] << "[" << i |
| << "] : " << params[0] << "[" << i << "]"; |
| } |
| } |
| l << ";"; |
| return true; |
| }); |
| } |
| |
| auto* expr_false = expr->args[0]; |
| auto* expr_true = expr->args[1]; |
| auto* expr_cond = expr->args[2]; |
| |
| ScopedParen paren(out); |
| if (!EmitExpression(out, expr_cond)) { |
| return false; |
| } |
| |
| out << " ? "; |
| |
| if (!EmitExpression(out, expr_true)) { |
| return false; |
| } |
| |
| out << " : "; |
| |
| if (!EmitExpression(out, expr_false)) { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| bool GeneratorImpl::EmitDotCall(utils::StringStream& out, |
| const ast::CallExpression* expr, |
| const sem::Builtin* builtin) { |
| auto* vec_ty = builtin->Parameters()[0]->Type()->As<type::Vector>(); |
| std::string fn = "dot"; |
| if (vec_ty->type()->is_integer_scalar()) { |
| // GLSL does not have a builtin for dot() with integer vector types. |
| // Generate the helper function if it hasn't been created already |
| fn = utils::GetOrCreate(int_dot_funcs_, vec_ty, [&]() -> std::string { |
| TextBuffer b; |
| TINT_DEFER(helpers_.Append(b)); |
| |
| auto fn_name = UniqueIdentifier("tint_int_dot"); |
| |
| std::string v; |
| { |
| utils::StringStream s; |
| if (!EmitType(s, vec_ty->type(), builtin::AddressSpace::kUndefined, |
| builtin::Access::kRead, "")) { |
| return ""; |
| } |
| v = s.str(); |
| } |
| { // (u)int tint_int_dot([i|u]vecN a, [i|u]vecN b) { |
| auto l = line(&b); |
| if (!EmitType(l, vec_ty->type(), builtin::AddressSpace::kUndefined, |
| builtin::Access::kRead, "")) { |
| return ""; |
| } |
| l << " " << fn_name << "("; |
| if (!EmitType(l, vec_ty, builtin::AddressSpace::kUndefined, builtin::Access::kRead, |
| "")) { |
| return ""; |
| } |
| l << " a, "; |
| if (!EmitType(l, vec_ty, builtin::AddressSpace::kUndefined, builtin::Access::kRead, |
| "")) { |
| return ""; |
| } |
| l << " b) {"; |
| } |
| { |
| auto l = line(&b); |
| l << " return "; |
| for (uint32_t i = 0; i < vec_ty->Width(); i++) { |
| if (i > 0) { |
| l << " + "; |
| } |
| l << "a[" << i << "]*b[" << i << "]"; |
| } |
| l << ";"; |
| } |
| line(&b) << "}"; |
| return fn_name; |
| }); |
| if (fn.empty()) { |
| return false; |
| } |
| } |
| |
| out << fn; |
| ScopedParen sp(out); |
| |
| if (!EmitExpression(out, expr->args[0])) { |
| return false; |
| } |
| out << ", "; |
| if (!EmitExpression(out, expr->args[1])) { |
| return false; |
| } |
| return true; |
| } |
| |
| bool GeneratorImpl::EmitModfCall(utils::StringStream& out, |
| const ast::CallExpression* expr, |
| const sem::Builtin* builtin) { |
| TINT_ASSERT(Writer, expr->args.Length() == 1); |
| return CallBuiltinHelper( |
| out, expr, builtin, [&](TextBuffer* b, const std::vector<std::string>& params) { |
| // Emit the builtin return type unique to this overload. This does not |
| // exist in the AST, so it will not be generated in Generate(). |
| if (!EmitStructType(&helpers_, builtin->ReturnType()->As<sem::Struct>())) { |
| return false; |
| } |
| |
| { |
| auto l = line(b); |
| if (!EmitType(l, builtin->ReturnType(), builtin::AddressSpace::kUndefined, |
| builtin::Access::kUndefined, "")) { |
| return false; |
| } |
| l << " result;"; |
| } |
| line(b) << "result.fract = modf(" << params[0] << ", result.whole);"; |
| line(b) << "return result;"; |
| return true; |
| }); |
| } |
| |
| bool GeneratorImpl::EmitFrexpCall(utils::StringStream& out, |
| const ast::CallExpression* expr, |
| const sem::Builtin* builtin) { |
| TINT_ASSERT(Writer, expr->args.Length() == 1); |
| return CallBuiltinHelper( |
| out, expr, builtin, [&](TextBuffer* b, const std::vector<std::string>& params) { |
| // Emit the builtin return type unique to this overload. This does not |
| // exist in the AST, so it will not be generated in Generate(). |
| if (!EmitStructType(&helpers_, builtin->ReturnType()->As<sem::Struct>())) { |
| return false; |
| } |
| |
| { |
| auto l = line(b); |
| if (!EmitType(l, builtin->ReturnType(), builtin::AddressSpace::kUndefined, |
| builtin::Access::kUndefined, "")) { |
| return false; |
| } |
| l << " result;"; |
| } |
| line(b) << "result.fract = frexp(" << params[0] << ", result.exp);"; |
| line(b) << "return result;"; |
| return true; |
| }); |
| } |
| |
| bool GeneratorImpl::EmitDegreesCall(utils::StringStream& out, |
| const ast::CallExpression* expr, |
| const sem::Builtin* builtin) { |
| auto* return_elem_type = type::Type::DeepestElementOf(builtin->ReturnType()); |
| const std::string suffix = Is<type::F16>(return_elem_type) ? "hf" : "f"; |
| return CallBuiltinHelper(out, expr, builtin, |
| [&](TextBuffer* b, const std::vector<std::string>& params) { |
| line(b) << "return " << params[0] << " * " << std::setprecision(20) |
| << sem::kRadToDeg << suffix << ";"; |
| return true; |
| }); |
| } |
| |
| bool GeneratorImpl::EmitRadiansCall(utils::StringStream& out, |
| const ast::CallExpression* expr, |
| const sem::Builtin* builtin) { |
| auto* return_elem_type = type::Type::DeepestElementOf(builtin->ReturnType()); |
| const std::string suffix = Is<type::F16>(return_elem_type) ? "hf" : "f"; |
| return CallBuiltinHelper(out, expr, builtin, |
| [&](TextBuffer* b, const std::vector<std::string>& params) { |
| line(b) << "return " << params[0] << " * " << std::setprecision(20) |
| << sem::kDegToRad << suffix << ";"; |
| return true; |
| }); |
| } |
| |
| bool GeneratorImpl::EmitQuantizeToF16Call(utils::StringStream& out, |
| const ast::CallExpression* expr, |
| const sem::Builtin* builtin) { |
| // Emulate by casting to f16 and back again. |
| return CallBuiltinHelper( |
| out, expr, builtin, [&](TextBuffer* b, const std::vector<std::string>& params) { |
| const auto v = params[0]; |
| if (auto* vec = builtin->ReturnType()->As<type::Vector>()) { |
| switch (vec->Width()) { |
| case 2: { |
| line(b) << "return unpackHalf2x16(packHalf2x16(" << v << "));"; |
| return true; |
| } |
| case 3: { |
| line(b) << "return vec3("; |
| line(b) << " unpackHalf2x16(packHalf2x16(" << v << ".xy)),"; |
| line(b) << " unpackHalf2x16(packHalf2x16(" << v << ".zz)).x);"; |
| return true; |
| } |
| default: { |
| line(b) << "return vec4("; |
| line(b) << " unpackHalf2x16(packHalf2x16(" << v << ".xy)),"; |
| line(b) << " unpackHalf2x16(packHalf2x16(" << v << ".zw)));"; |
| return true; |
| } |
| } |
| } |
| line(b) << "return unpackHalf2x16(packHalf2x16(vec2(" << v << "))).x;"; |
| return true; |
| }); |
| } |
| |
| bool GeneratorImpl::EmitBarrierCall(utils::StringStream& out, const sem::Builtin* builtin) { |
| // TODO(crbug.com/tint/661): Combine sequential barriers to a single |
| // instruction. |
| if (builtin->Type() == builtin::Function::kWorkgroupBarrier) { |
| out << "barrier()"; |
| } else if (builtin->Type() == builtin::Function::kStorageBarrier) { |
| out << "{ barrier(); memoryBarrierBuffer(); }"; |
| } else { |
| TINT_UNREACHABLE(Writer, diagnostics_) |
| << "unexpected barrier builtin type " << builtin::str(builtin->Type()); |
| return false; |
| } |
| return true; |
| } |
| |
| const ast::Expression* GeneratorImpl::CreateF32Zero(const sem::Statement* stmt) { |
| auto* zero = builder_.Expr(0_f); |
| auto* f32 = builder_.create<type::F32>(); |
| auto* sem_zero = builder_.create<sem::ValueExpression>( |
| zero, f32, sem::EvaluationStage::kRuntime, stmt, /* constant_value */ nullptr, |
| /* has_side_effects */ false); |
| builder_.Sem().Add(zero, sem_zero); |
| return zero; |
| } |
| |
| bool GeneratorImpl::EmitTextureCall(utils::StringStream& out, |
| const sem::Call* call, |
| const sem::Builtin* builtin) { |
| using Usage = sem::ParameterUsage; |
| |
| auto& signature = builtin->Signature(); |
| auto* expr = call->Declaration(); |
| auto arguments = expr->args; |
| |
| // Returns the argument with the given usage |
| auto arg = [&](Usage usage) { |
| auto idx = signature.IndexOf(usage); |
| return (idx >= 0) ? arguments[static_cast<size_t>(idx)] : nullptr; |
| }; |
| |
| auto* texture = arg(Usage::kTexture); |
| if (TINT_UNLIKELY(!texture)) { |
| TINT_ICE(Writer, diagnostics_) << "missing texture argument"; |
| return false; |
| } |
| |
| auto* texture_type = TypeOf(texture)->UnwrapRef()->As<type::Texture>(); |
| |
| auto emit_signed_int_type = [&](const type::Type* ty) { |
| uint32_t width = 0; |
| type::Type::ElementOf(ty, &width); |
| if (width > 1) { |
| out << "ivec" << width; |
| } else { |
| out << "int"; |
| } |
| }; |
| |
| auto emit_unsigned_int_type = [&](const type::Type* ty) { |
| uint32_t width = 0; |
| type::Type::ElementOf(ty, &width); |
| if (width > 1) { |
| out << "uvec" << width; |
| } else { |
| out << "uint"; |
| } |
| }; |
| |
| auto emit_expr_as_signed = [&](const ast::Expression* e) { |
| auto* ty = TypeOf(e)->UnwrapRef(); |
| if (!ty->is_unsigned_integer_scalar_or_vector()) { |
| return EmitExpression(out, e); |
| } |
| emit_signed_int_type(ty); |
| ScopedParen sp(out); |
| return EmitExpression(out, e); |
| }; |
| |
| switch (builtin->Type()) { |
| case builtin::Function::kTextureDimensions: { |
| // textureDimensions() returns an unsigned scalar / vector in WGSL. |
| // textureSize() / imageSize() returns a signed scalar / vector in GLSL. |
| // Cast. |
| emit_unsigned_int_type(call->Type()); |
| ScopedParen sp(out); |
| |
| if (texture_type->Is<type::StorageTexture>()) { |
| out << "imageSize("; |
| } else { |
| out << "textureSize("; |
| } |
| if (!EmitExpression(out, texture)) { |
| return false; |
| } |
| |
| // The LOD parameter is mandatory on textureSize() for non-multisampled |
| // textures. |
| if (!texture_type->Is<type::StorageTexture>() && |
| !texture_type->Is<type::MultisampledTexture>() && |
| !texture_type->Is<type::DepthMultisampledTexture>()) { |
| out << ", "; |
| if (auto* level_arg = arg(Usage::kLevel)) { |
| if (!emit_expr_as_signed(level_arg)) { |
| return false; |
| } |
| } else { |
| out << "0"; |
| } |
| } |
| out << ")"; |
| // textureSize() on array samplers returns the array size in the |
| // final component, so strip it out. |
| if (texture_type->dim() == type::TextureDimension::k2dArray || |
| texture_type->dim() == type::TextureDimension::kCubeArray) { |
| out << ".xy"; |
| } |
| return true; |
| } |
| case builtin::Function::kTextureNumLayers: { |
| // textureNumLayers() returns an unsigned scalar in WGSL. |
| // textureSize() / imageSize() returns a signed scalar / vector in GLSL. |
| // Cast. |
| out << "uint"; |
| ScopedParen sp(out); |
| |
| if (texture_type->Is<type::StorageTexture>()) { |
| out << "imageSize("; |
| } else { |
| out << "textureSize("; |
| } |
| // textureSize() on sampler2dArray returns the array size in the |
| // final component, so return it |
| if (!EmitExpression(out, texture)) { |
| return false; |
| } |
| // The LOD parameter is mandatory on textureSize() for non-multisampled |
| // textures. |
| if (!texture_type->Is<type::StorageTexture>() && |
| !texture_type->Is<type::MultisampledTexture>() && |
| !texture_type->Is<type::DepthMultisampledTexture>()) { |
| out << ", "; |
| if (auto* level_arg = arg(Usage::kLevel)) { |
| if (!emit_expr_as_signed(level_arg)) { |
| return false; |
| } |
| } else { |
| out << "0"; |
| } |
| } |
| out << ").z"; |
| return true; |
| } |
| case builtin::Function::kTextureNumLevels: { |
| // textureNumLevels() returns an unsigned scalar in WGSL. |
| // textureQueryLevels() returns a signed scalar in GLSL. |
| // Cast. |
| out << "uint"; |
| ScopedParen sp(out); |
| |
| out << "textureQueryLevels("; |
| if (!EmitExpression(out, texture)) { |
| return false; |
| } |
| out << ")"; |
| return true; |
| } |
| case builtin::Function::kTextureNumSamples: { |
| // textureNumSamples() returns an unsigned scalar in WGSL. |
| // textureSamples() returns a signed scalar in GLSL. |
| // Cast. |
| out << "uint"; |
| ScopedParen sp(out); |
| |
| out << "textureSamples("; |
| if (!EmitExpression(out, texture)) { |
| return false; |
| } |
| out << ")"; |
| return true; |
| } |
| default: |
| break; |
| } |
| |
| uint32_t glsl_ret_width = 4u; |
| bool append_depth_ref_to_coords = true; |
| bool is_depth = texture_type->Is<type::DepthTexture>(); |
| |
| switch (builtin->Type()) { |
| case builtin::Function::kTextureSample: |
| case builtin::Function::kTextureSampleBias: |
| out << "texture"; |
| if (is_depth) { |
| glsl_ret_width = 1u; |
| } |
| break; |
| case builtin::Function::kTextureSampleLevel: |
| out << "textureLod"; |
| if (is_depth) { |
| glsl_ret_width = 1u; |
| } |
| break; |
| case builtin::Function::kTextureGather: |
| case builtin::Function::kTextureGatherCompare: |
| out << "textureGather"; |
| append_depth_ref_to_coords = false; |
| break; |
| case builtin::Function::kTextureSampleGrad: |
| out << "textureGrad"; |
| break; |
| case builtin::Function::kTextureSampleCompare: |
| case builtin::Function::kTextureSampleCompareLevel: |
| out << "texture"; |
| glsl_ret_width = 1; |
| break; |
| case builtin::Function::kTextureLoad: |
| out << "texelFetch"; |
| break; |
| case builtin::Function::kTextureStore: |
| out << "imageStore"; |
| break; |
| default: |
| diagnostics_.add_error(diag::System::Writer, |
| "Internal compiler error: Unhandled texture builtin '" + |
| std::string(builtin->str()) + "'"); |
| return false; |
| } |
| |
| if (builtin->Signature().IndexOf(sem::ParameterUsage::kOffset) >= 0) { |
| out << "Offset"; |
| } |
| |
| out << "("; |
| |
| if (!EmitExpression(out, texture)) { |
| return false; |
| } |
| |
| out << ", "; |
| |
| auto* param_coords = arg(Usage::kCoords); |
| if (TINT_UNLIKELY(!param_coords)) { |
| TINT_ICE(Writer, diagnostics_) << "missing coords argument"; |
| return false; |
| } |
| |
| if (auto* array_index = arg(Usage::kArrayIndex)) { |
| // Array index needs to be appended to the coordinates. |
| param_coords = AppendVector(&builder_, param_coords, array_index)->Declaration(); |
| } |
| |
| // GLSL requires Dref to be appended to the coordinates, *unless* it's |
| // samplerCubeArrayShadow, in which case it will be handled as a separate |
| // parameter. |
| if (texture_type->dim() == type::TextureDimension::kCubeArray) { |
| append_depth_ref_to_coords = false; |
| } |
| |
| if (is_depth && append_depth_ref_to_coords) { |
| auto* depth_ref = arg(Usage::kDepthRef); |
| if (!depth_ref) { |
| // Sampling a depth texture in GLSL always requires a depth reference, so |
| // append zero here. |
| depth_ref = CreateF32Zero(builder_.Sem().Get(param_coords)->Stmt()); |
| } |
| param_coords = AppendVector(&builder_, param_coords, depth_ref)->Declaration(); |
| } |
| |
| if (!emit_expr_as_signed(param_coords)) { |
| return false; |
| } |
| |
| for (auto usage : {Usage::kLevel, Usage::kDdx, Usage::kDdy, Usage::kSampleIndex}) { |
| if (auto* e = arg(usage)) { |
| out << ", "; |
| if (usage == Usage::kLevel && is_depth) { |
| // WGSL's textureSampleLevel() "level" param is i32 for depth textures, |
| // whereas GLSL's textureLod() "lod" param is always float, so cast it. |
| out << "float("; |
| if (!EmitExpression(out, e)) { |
| return false; |
| } |
| out << ")"; |
| } else if (!emit_expr_as_signed(e)) { |
| return false; |
| } |
| } |
| } |
| |
| if (auto* e = arg(Usage::kValue)) { |
| out << ", "; |
| if (!EmitExpression(out, e)) { |
| return false; |
| } |
| } |
| |
| // GLSL's textureGather always requires a refZ parameter. |
| if (is_depth && builtin->Type() == builtin::Function::kTextureGather) { |
| out << ", 0.0"; |
| } |
| |
| // [1] samplerCubeArrayShadow requires a separate depthRef parameter |
| if (is_depth && !append_depth_ref_to_coords) { |
| if (auto* e = arg(Usage::kDepthRef)) { |
| out << ", "; |
| if (!EmitExpression(out, e)) { |
| return false; |
| } |
| } else if (builtin->Type() == builtin::Function::kTextureSample) { |
| out << ", 0.0f"; |
| } |
| } |
| |
| for (auto usage : {Usage::kOffset, Usage::kComponent, Usage::kBias}) { |
| if (auto* e = arg(usage)) { |
| out << ", "; |
| if (!emit_expr_as_signed(e)) { |
| return false; |
| } |
| } |
| } |
| |
| out << ")"; |
| |
| if (builtin->ReturnType()->Is<type::Void>()) { |
| return true; |
| } |
| // If the builtin return type does not match the number of elements of the |
| // GLSL builtin, we need to swizzle the expression to generate the correct |
| // number of components. |
| uint32_t wgsl_ret_width = 1; |
| if (auto* vec = builtin->ReturnType()->As<type::Vector>()) { |
| wgsl_ret_width = vec->Width(); |
| } |
| if (wgsl_ret_width < glsl_ret_width) { |
| out << "."; |
| for (uint32_t i = 0; i < wgsl_ret_width; i++) { |
| out << "xyz"[i]; |
| } |
| } |
| if (TINT_UNLIKELY(wgsl_ret_width > glsl_ret_width)) { |
| TINT_ICE(Writer, diagnostics_) |
| << "WGSL return width (" << wgsl_ret_width << ") is wider than GLSL return width (" |
| << glsl_ret_width << ") for " << builtin->Type(); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| std::string GeneratorImpl::generate_builtin_name(const sem::Builtin* builtin) { |
| switch (builtin->Type()) { |
| case builtin::Function::kAbs: |
| case builtin::Function::kAcos: |
| case builtin::Function::kAcosh: |
| case builtin::Function::kAll: |
| case builtin::Function::kAny: |
| case builtin::Function::kAsin: |
| case builtin::Function::kAsinh: |
| case builtin::Function::kAtan: |
| case builtin::Function::kAtanh: |
| case builtin::Function::kCeil: |
| case builtin::Function::kClamp: |
| case builtin::Function::kCos: |
| case builtin::Function::kCosh: |
| case builtin::Function::kCross: |
| case builtin::Function::kDeterminant: |
| case builtin::Function::kDistance: |
| case builtin::Function::kDot: |
| case builtin::Function::kExp: |
| case builtin::Function::kExp2: |
| case builtin::Function::kFloor: |
| case builtin::Function::kFrexp: |
| case builtin::Function::kLdexp: |
| case builtin::Function::kLength: |
| case builtin::Function::kLog: |
| case builtin::Function::kLog2: |
| case builtin::Function::kMax: |
| case builtin::Function::kMin: |
| case builtin::Function::kModf: |
| case builtin::Function::kNormalize: |
| case builtin::Function::kPow: |
| case builtin::Function::kReflect: |
| case builtin::Function::kRefract: |
| case builtin::Function::kRound: |
| case builtin::Function::kSign: |
| case builtin::Function::kSin: |
| case builtin::Function::kSinh: |
| case builtin::Function::kSqrt: |
| case builtin::Function::kStep: |
| case builtin::Function::kTan: |
| case builtin::Function::kTanh: |
| case builtin::Function::kTranspose: |
| case builtin::Function::kTrunc: |
| return builtin->str(); |
| case builtin::Function::kAtan2: |
| return "atan"; |
| case builtin::Function::kCountOneBits: |
| return "bitCount"; |
| case builtin::Function::kDpdx: |
| return "dFdx"; |
| case builtin::Function::kDpdxCoarse: |
| if (version_.IsES()) { |
| return "dFdx"; |
| } |
| return "dFdxCoarse"; |
| case builtin::Function::kDpdxFine: |
| if (version_.IsES()) { |
| return "dFdx"; |
| } |
| return "dFdxFine"; |
| case builtin::Function::kDpdy: |
| return "dFdy"; |
| case builtin::Function::kDpdyCoarse: |
| if (version_.IsES()) { |
| return "dFdy"; |
| } |
| return "dFdyCoarse"; |
| case builtin::Function::kDpdyFine: |
| if (version_.IsES()) { |
| return "dFdy"; |
| } |
| return "dFdyFine"; |
| case builtin::Function::kFaceForward: |
| return "faceforward"; |
| case builtin::Function::kFract: |
| return "fract"; |
| case builtin::Function::kFma: |
| return "fma"; |
| case builtin::Function::kFwidth: |
| case builtin::Function::kFwidthCoarse: |
| case builtin::Function::kFwidthFine: |
| return "fwidth"; |
| case builtin::Function::kInverseSqrt: |
| return "inversesqrt"; |
| case builtin::Function::kMix: |
| return "mix"; |
| case builtin::Function::kPack2X16Float: |
| return "packHalf2x16"; |
| case builtin::Function::kPack2X16Snorm: |
| return "packSnorm2x16"; |
| case builtin::Function::kPack2X16Unorm: |
| return "packUnorm2x16"; |
| case builtin::Function::kPack4X8Snorm: |
| return "packSnorm4x8"; |
| case builtin::Function::kPack4X8Unorm: |
| return "packUnorm4x8"; |
| case builtin::Function::kReverseBits: |
| return "bitfieldReverse"; |
| case builtin::Function::kSmoothstep: |
| return "smoothstep"; |
| case builtin::Function::kUnpack2X16Float: |
| return "unpackHalf2x16"; |
| case builtin::Function::kUnpack2X16Snorm: |
| return "unpackSnorm2x16"; |
| case builtin::Function::kUnpack2X16Unorm: |
| return "unpackUnorm2x16"; |
| case builtin::Function::kUnpack4X8Snorm: |
| return "unpackSnorm4x8"; |
| case builtin::Function::kUnpack4X8Unorm: |
| return "unpackUnorm4x8"; |
| default: |
| diagnostics_.add_error(diag::System::Writer, |
| "Unknown builtin method: " + std::string(builtin->str())); |
| } |
| |
| return ""; |
| } |
| |
| bool GeneratorImpl::EmitCase(const ast::CaseStatement* stmt) { |
| auto* sem = builder_.Sem().Get<sem::CaseStatement>(stmt); |
| for (auto* selector : sem->Selectors()) { |
| auto out = line(); |
| |
| if (selector->IsDefault()) { |
| out << "default"; |
| } else { |
| out << "case "; |
| if (!EmitConstant(out, selector->Value())) { |
| return false; |
| } |
| } |
| out << ":"; |
| if (selector == sem->Selectors().back()) { |
| out << " {"; |
| } |
| } |
| |
| { |
| ScopedIndent si(this); |
| if (!EmitStatements(stmt->body->statements)) { |
| return false; |
| } |
| if (!last_is_break(stmt->body)) { |
| line() << "break;"; |
| } |
| } |
| |
| line() << "}"; |
| |
| return true; |
| } |
| |
| bool GeneratorImpl::EmitContinue(const ast::ContinueStatement*) { |
| if (!emit_continuing_ || !emit_continuing_()) { |
| return false; |
| } |
| line() << "continue;"; |
| return true; |
| } |
| |
| bool GeneratorImpl::EmitDiscard(const ast::DiscardStatement*) { |
| // TODO(dsinclair): Verify this is correct when the discard semantics are |
| // defined for WGSL (https://github.com/gpuweb/gpuweb/issues/361) |
| line() << "discard;"; |
| return true; |
| } |
| |
| bool GeneratorImpl::EmitExpression(utils::StringStream& out, const ast::Expression* expr) { |
| if (auto* sem = builder_.Sem().GetVal(expr)) { |
| if (auto* constant = sem->ConstantValue()) { |
| return EmitConstant(out, constant); |
| } |
| } |
| return Switch( |
| expr, // |
| [&](const ast::IndexAccessorExpression* a) { return EmitIndexAccessor(out, a); }, |
| [&](const ast::BinaryExpression* b) { return EmitBinary(out, b); }, |
| [&](const ast::BitcastExpression* b) { return EmitBitcast(out, b); }, |
| [&](const ast::CallExpression* c) { return EmitCall(out, c); }, |
| [&](const ast::IdentifierExpression* i) { return EmitIdentifier(out, i); }, |
| [&](const ast::LiteralExpression* l) { return EmitLiteral(out, l); }, |
| [&](const ast::MemberAccessorExpression* m) { return EmitMemberAccessor(out, m); }, |
| [&](const ast::UnaryOpExpression* u) { return EmitUnaryOp(out, u); }, |
| [&](Default) { // |
| diagnostics_.add_error(diag::System::Writer, "unknown expression type: " + |
| std::string(expr->TypeInfo().name)); |
| return false; |
| }); |
| } |
| |
| bool GeneratorImpl::EmitIdentifier(utils::StringStream& out, |
| const ast::IdentifierExpression* expr) { |
| out << builder_.Symbols().NameFor(expr->identifier->symbol); |
| return true; |
| } |
| |
| bool GeneratorImpl::EmitIf(const ast::IfStatement* stmt) { |
| { |
| auto out = line(); |
| out << "if ("; |
| if (!EmitExpression(out, stmt->condition)) { |
| return false; |
| } |
| out << ") {"; |
| } |
| |
| if (!EmitStatementsWithIndent(stmt->body->statements)) { |
| return false; |
| } |
| |
| if (stmt->else_statement) { |
| line() << "} else {"; |
| if (auto* block = stmt->else_statement->As<ast::BlockStatement>()) { |
| if (!EmitStatementsWithIndent(block->statements)) { |
| return false; |
| } |
| } else { |
| if (!EmitStatementsWithIndent(utils::Vector{stmt->else_statement})) { |
| return false; |
| } |
| } |
| } |
| line() << "}"; |
| |
| return true; |
| } |
| |
| bool GeneratorImpl::EmitFunction(const ast::Function* func) { |
| auto* sem = builder_.Sem().Get(func); |
| |
| if (ast::HasAttribute<ast::InternalAttribute>(func->attributes)) { |
| // An internal function. Do not emit. |
| return true; |
| } |
| |
| { |
| auto out = line(); |
| auto name = builder_.Symbols().NameFor(func->name->symbol); |
| if (!EmitType(out, sem->ReturnType(), builtin::AddressSpace::kUndefined, |
| builtin::Access::kReadWrite, "")) { |
| return false; |
| } |
| |
| out << " " << name << "("; |
| |
| bool first = true; |
| |
| for (auto* v : sem->Parameters()) { |
| if (!first) { |
| out << ", "; |
| } |
| first = false; |
| |
| auto const* type = v->Type(); |
| |
| if (auto* ptr = type->As<type::Pointer>()) { |
| // Transform pointer parameters in to `inout` parameters. |
| // The WGSL spec is highly restrictive in what can be passed in pointer |
| // parameters, which allows for this transformation. See: |
| // https://gpuweb.github.io/gpuweb/wgsl/#function-restriction |
| out << "inout "; |
| type = ptr->StoreType(); |
| } |
| |
| // Note: WGSL only allows for AddressSpace::kUndefined on parameters, however |
| // the sanitizer transforms generates load / store functions for storage |
| // or uniform buffers. These functions have a buffer parameter with |
| // AddressSpace::kStorage or AddressSpace::kUniform. This is required to |
| // correctly translate the parameter to a [RW]ByteAddressBuffer for |
| // storage buffers and a uint4[N] for uniform buffers. |
| if (!EmitTypeAndName(out, type, v->AddressSpace(), v->Access(), |
| builder_.Symbols().NameFor(v->Declaration()->name->symbol))) { |
| return false; |
| } |
| } |
| out << ") {"; |
| } |
| |
| if (!EmitStatementsWithIndent(func->body->statements)) { |
| return false; |
| } |
| |
| line() << "}"; |
| line(); |
| |
| return true; |
| } |
| |
| bool GeneratorImpl::EmitGlobalVariable(const ast::Variable* global) { |
| return Switch( |
| global, // |
| [&](const ast::Var* var) { |
| auto* sem = builder_.Sem().Get<sem::GlobalVariable>(global); |
| switch (sem->AddressSpace()) { |
| case builtin::AddressSpace::kUniform: |
| return EmitUniformVariable(var, sem); |
| case builtin::AddressSpace::kStorage: |
| return EmitStorageVariable(var, sem); |
| case builtin::AddressSpace::kHandle: |
| return EmitHandleVariable(var, sem); |
| case builtin::AddressSpace::kPrivate: |
| return EmitPrivateVariable(sem); |
| case builtin::AddressSpace::kWorkgroup: |
| return EmitWorkgroupVariable(sem); |
| case builtin::AddressSpace::kIn: |
| case builtin::AddressSpace::kOut: |
| return EmitIOVariable(sem); |
| case builtin::AddressSpace::kPushConstant: |
| diagnostics_.add_error( |
| diag::System::Writer, |
| "unhandled address space " + utils::ToString(sem->AddressSpace())); |
| return false; |
| default: { |
| TINT_ICE(Writer, diagnostics_) |
| << "unhandled address space " << sem->AddressSpace(); |
| return false; |
| } |
| } |
| }, |
| [&](const ast::Let* let) { return EmitProgramConstVariable(let); }, |
| [&](const ast::Override*) { |
| // Override is removed with SubstituteOverride |
| diagnostics_.add_error(diag::System::Writer, |
| "override-expressions should have been removed with the " |
| "SubstituteOverride transform"); |
| return false; |
| }, |
| [&](const ast::Const*) { |
| return true; // Constants are embedded at their use |
| }, |
| [&](Default) { |
| TINT_ICE(Writer, diagnostics_) |
| << "unhandled global variable type " << global->TypeInfo().name; |
| return false; |
| }); |
| } |
| |
| bool GeneratorImpl::EmitUniformVariable(const ast::Var* var, const sem::Variable* sem) { |
| auto* type = sem->Type()->UnwrapRef(); |
| auto* str = type->As<sem::Struct>(); |
| if (TINT_UNLIKELY(!str)) { |
| TINT_ICE(Writer, builder_.Diagnostics()) << "storage variable must be of struct type"; |
| return false; |
| } |
| auto bp = sem->As<sem::GlobalVariable>()->BindingPoint(); |
| { |
| auto out = line(); |
| out << "layout(binding = " << bp.binding << ", std140"; |
| out << ") uniform " << UniqueIdentifier(StructName(str) + "_ubo") << " {"; |
| } |
| EmitStructMembers(current_buffer_, str); |
| auto name = builder_.Symbols().NameFor(var->name->symbol); |
| line() << "} " << name << ";"; |
| line(); |
| |
| return true; |
| } |
| |
| bool GeneratorImpl::EmitStorageVariable(const ast::Var* var, const sem::Variable* sem) { |
| auto* type = sem->Type()->UnwrapRef(); |
| auto* str = type->As<sem::Struct>(); |
| if (TINT_UNLIKELY(!str)) { |
| TINT_ICE(Writer, builder_.Diagnostics()) << "storage variable must be of struct type"; |
| return false; |
| } |
| auto bp = sem->As<sem::GlobalVariable>()->BindingPoint(); |
| line() << "layout(binding = " << bp.binding << ", std430) buffer " |
| << UniqueIdentifier(StructName(str) + "_ssbo") << " {"; |
| EmitStructMembers(current_buffer_, str); |
| auto name = builder_.Symbols().NameFor(var->name->symbol); |
| line() << "} " << name << ";"; |
| line(); |
| |
| return true; |
| } |
| |
| bool GeneratorImpl::EmitHandleVariable(const ast::Var* var, const sem::Variable* sem) { |
| auto out = line(); |
| |
| auto name = builder_.Symbols().NameFor(var->name->symbol); |
| auto* type = sem->Type()->UnwrapRef(); |
| if (type->Is<type::Sampler>()) { |
| // GLSL ignores Sampler variables. |
| return true; |
| } |
| if (auto* storage = type->As<type::StorageTexture>()) { |
| out << "layout("; |
| switch (storage->texel_format()) { |
| case builtin::TexelFormat::kBgra8Unorm: |
| TINT_ICE(Writer, diagnostics_) |
| << "bgra8unorm should have been polyfilled to rgba8unorm"; |
| break; |
| case builtin::TexelFormat::kR32Uint: |
| out << "r32ui"; |
| break; |
| case builtin::TexelFormat::kR32Sint: |
| out << "r32i"; |
| break; |
| case builtin::TexelFormat::kR32Float: |
| out << "r32f"; |
| break; |
| case builtin::TexelFormat::kRgba8Unorm: |
| out << "rgba8"; |
| break; |
| case builtin::TexelFormat::kRgba8Snorm: |
| out << "rgba8_snorm"; |
| break; |
| case builtin::TexelFormat::kRgba8Uint: |
| out << "rgba8ui"; |
| break; |
| case builtin::TexelFormat::kRgba8Sint: |
| out << "rgba8i"; |
| break; |
| case builtin::TexelFormat::kRg32Uint: |
| out << "rg32ui"; |
| break; |
| case builtin::TexelFormat::kRg32Sint: |
| out << "rg32i"; |
| break; |
| case builtin::TexelFormat::kRg32Float: |
| out << "rg32f"; |
| break; |
| case builtin::TexelFormat::kRgba16Uint: |
| out << "rgba16ui"; |
| break; |
| case builtin::TexelFormat::kRgba16Sint: |
| out << "rgba16i"; |
| break; |
| case builtin::TexelFormat::kRgba16Float: |
| out << "rgba16f"; |
| break; |
| case builtin::TexelFormat::kRgba32Uint: |
| out << "rgba32ui"; |
| break; |
| case builtin::TexelFormat::kRgba32Sint: |
| out << "rgba32i"; |
| break; |
| case builtin::TexelFormat::kRgba32Float: |
| out << "rgba32f"; |
| break; |
| case builtin::TexelFormat::kUndefined: |
| TINT_ICE(Writer, diagnostics_) << "invalid texel format"; |
| return false; |
| } |
| out << ") "; |
| } |
| if (!EmitTypeAndName(out, type, sem->AddressSpace(), sem->Access(), name)) { |
| return false; |
| } |
| |
| out << ";"; |
| return true; |
| } |
| |
| bool GeneratorImpl::EmitPrivateVariable(const sem::Variable* var) { |
| auto* decl = var->Declaration(); |
| auto out = line(); |
| |
| auto name = builder_.Symbols().NameFor(decl->name->symbol); |
| auto* type = var->Type()->UnwrapRef(); |
| if (!EmitTypeAndName(out, type, var->AddressSpace(), var->Access(), name)) { |
| return false; |
| } |
| |
| out << " = "; |
| if (auto* initializer = decl->initializer) { |
| if (!EmitExpression(out, initializer)) { |
| return false; |
| } |
| } else { |
| if (!EmitZeroValue(out, var->Type()->UnwrapRef())) { |
| return false; |
| } |
| } |
| |
| out << ";"; |
| return true; |
| } |
| |
| bool GeneratorImpl::EmitWorkgroupVariable(const sem::Variable* var) { |
| auto* decl = var->Declaration(); |
| auto out = line(); |
| |
| out << "shared "; |
| |
| auto name = builder_.Symbols().NameFor(decl->name->symbol); |
| auto* type = var->Type()->UnwrapRef(); |
| if (!EmitTypeAndName(out, type, var->AddressSpace(), var->Access(), name)) { |
| return false; |
| } |
| |
| if (auto* initializer = decl->initializer) { |
| out << " = "; |
| if (!EmitExpression(out, initializer)) { |
| return false; |
| } |
| } |
| |
| out << ";"; |
| return true; |
| } |
| |
| bool GeneratorImpl::EmitIOVariable(const sem::GlobalVariable* var) { |
| auto* decl = var->Declaration(); |
| |
| if (auto* attr = ast::GetAttribute<ast::BuiltinAttribute>(decl->attributes)) { |
| auto builtin = program_->Sem().Get(attr)->Value(); |
| // Use of gl_SampleID requires the GL_OES_sample_variables extension |
| if (RequiresOESSampleVariables(builtin)) { |
| requires_oes_sample_variables_ = true; |
| } |
| // Do not emit builtin (gl_) variables. |
| return true; |
| } |
| |
| auto out = line(); |
| EmitAttributes(out, var, decl->attributes); |
| EmitInterpolationQualifiers(out, decl->attributes); |
| |
| auto name = builder_.Symbols().NameFor(decl->name->symbol); |
| auto* type = var->Type()->UnwrapRef(); |
| if (!EmitTypeAndName(out, type, var->AddressSpace(), var->Access(), name)) { |
| return false; |
| } |
| |
| if (auto* initializer = decl->initializer) { |
| out << " = "; |
| if (!EmitExpression(out, initializer)) { |
| return false; |
| } |
| } |
| |
| out << ";"; |
| return true; |
| } |
| |
| void GeneratorImpl::EmitInterpolationQualifiers( |
| utils::StringStream& out, |
| utils::VectorRef<const ast::Attribute*> attributes) { |
| for (auto* attr : attributes) { |
| if (auto* interpolate = attr->As<ast::InterpolateAttribute>()) { |
| auto& sem = program_->Sem(); |
| auto i_type = |
| sem.Get<sem::BuiltinEnumExpression<builtin::InterpolationType>>(interpolate->type) |
| ->Value(); |
| switch (i_type) { |
| case builtin::InterpolationType::kPerspective: |
| case builtin::InterpolationType::kLinear: |
| case builtin::InterpolationType::kUndefined: |
| break; |
| case builtin::InterpolationType::kFlat: |
| out << "flat "; |
| break; |
| } |
| |
| if (interpolate->sampling) { |
| auto i_smpl = sem.Get<sem::BuiltinEnumExpression<builtin::InterpolationSampling>>( |
| interpolate->sampling) |
| ->Value(); |
| switch (i_smpl) { |
| case builtin::InterpolationSampling::kCentroid: |
| out << "centroid "; |
| break; |
| case builtin::InterpolationSampling::kSample: |
| case builtin::InterpolationSampling::kCenter: |
| case builtin::InterpolationSampling::kUndefined: |
| break; |
| } |
| } |
| } |
| } |
| } |
| |
| bool GeneratorImpl::EmitAttributes(utils::StringStream& out, |
| const sem::GlobalVariable* var, |
| utils::VectorRef<const ast::Attribute*> attributes) { |
| if (attributes.IsEmpty()) { |
| return true; |
| } |
| bool first = true; |
| for (auto* attr : attributes) { |
| if (attr->As<ast::LocationAttribute>()) { |
| out << (first ? "layout(" : ", "); |
| out << "location = " << std::to_string(var->Location().value()); |
| first = false; |
| } |
| } |
| if (!first) { |
| out << ") "; |
| } |
| return true; |
| } |
| |
| bool GeneratorImpl::EmitEntryPointFunction(const ast::Function* func) { |
| auto* func_sem = builder_.Sem().Get(func); |
| |
| if (func->PipelineStage() == ast::PipelineStage::kFragment) { |
| requires_default_precision_qualifier_ = true; |
| } |
| |
| if (func->PipelineStage() == ast::PipelineStage::kCompute) { |
| auto out = line(); |
| // Emit the layout(local_size) attributes. |
| auto wgsize = func_sem->WorkgroupSize(); |
| out << "layout("; |
| for (size_t i = 0; i < 3; i++) { |
| if (i > 0) { |
| out << ", "; |
| } |
| out << "local_size_" << (i == 0 ? "x" : i == 1 ? "y" : "z") << " = "; |
| |
| if (!wgsize[i].has_value()) { |
| diagnostics_.add_error( |
| diag::System::Writer, |
| "override-expressions should have been removed with the SubstituteOverride " |
| "transform"); |
| return false; |
| } |
| out << std::to_string(wgsize[i].value()); |
| } |
| out << ") in;"; |
| } |
| |
| // Emit original entry point signature |
| { |
| auto out = line(); |
| if (!EmitTypeAndName(out, func_sem->ReturnType(), builtin::AddressSpace::kUndefined, |
| builtin::Access::kUndefined, |
| builder_.Symbols().NameFor(func->name->symbol))) { |
| return false; |
| } |
| out << "("; |
| |
| bool first = true; |
| |
| // Emit entry point parameters. |
| for (auto* var : func->params) { |
| auto* sem = builder_.Sem().Get(var); |
| auto* type = sem->Type(); |
| if (TINT_UNLIKELY(!type->Is<sem::Struct>())) { |
| // ICE likely indicates that the CanonicalizeEntryPointIO transform was |
| // not run, or a builtin parameter was added after it was run. |
| TINT_ICE(Writer, diagnostics_) << "Unsupported non-struct entry point parameter"; |
| } |
| |
| if (!first) { |
| out << ", "; |
| } |
| first = false; |
| |
| if (!EmitTypeAndName(out, type, sem->AddressSpace(), sem->Access(), |
| builder_.Symbols().NameFor(var->name->symbol))) { |
| return false; |
| } |
| } |
| |
| out << ") {"; |
| } |
| |
| // Emit original entry point function body |
| { |
| ScopedIndent si(this); |
| if (func->PipelineStage() == ast::PipelineStage::kVertex) { |
| line() << "gl_PointSize = 1.0;"; |
| } |
| |
| if (!EmitStatements(func->body->statements)) { |
| return false; |
| } |
| |
| if (!Is<ast::ReturnStatement>(func->body->Last())) { |
| ast::ReturnStatement ret(ProgramID{}, ast::NodeID{}, Source{}); |
| if (!EmitStatement(&ret)) { |
| return false; |
| } |
| } |
| } |
| |
| line() << "}"; |
| |
| return true; |
| } |
| |
| bool GeneratorImpl::EmitConstant(utils::StringStream& out, const constant::Value* constant) { |
| return Switch( |
| constant->Type(), // |
| [&](const type::Bool*) { |
| out << (constant->ValueAs<AInt>() ? "true" : "false"); |
| return true; |
| }, |
| [&](const type::F32*) { |
| PrintF32(out, constant->ValueAs<f32>()); |
| return true; |
| }, |
| [&](const type::F16*) { |
| PrintF16(out, constant->ValueAs<f16>()); |
| return true; |
| }, |
| [&](const type::I32*) { |
| PrintI32(out, constant->ValueAs<i32>()); |
| return true; |
| }, |
| [&](const type::U32*) { |
| out << constant->ValueAs<AInt>() << "u"; |
| return true; |
| }, |
| [&](const type::Vector* v) { |
| if (!EmitType(out, v, builtin::AddressSpace::kUndefined, builtin::Access::kUndefined, |
| "")) { |
| return false; |
| } |
| |
| ScopedParen sp(out); |
| |
| if (auto* splat = constant->As<constant::Splat>()) { |
| return EmitConstant(out, splat->el); |
| } |
| |
| for (size_t i = 0; i < v->Width(); i++) { |
| if (i > 0) { |
| out << ", "; |
| } |
| if (!EmitConstant(out, constant->Index(i))) { |
| return false; |
| } |
| } |
| return true; |
| }, |
| [&](const type::Matrix* m) { |
| if (!EmitType(out, m, builtin::AddressSpace::kUndefined, builtin::Access::kUndefined, |
| "")) { |
| return false; |
| } |
| |
| ScopedParen sp(out); |
| |
| for (size_t column_idx = 0; column_idx < m->columns(); column_idx++) { |
| if (column_idx > 0) { |
| out << ", "; |
| } |
| if (!EmitConstant(out, constant->Index(column_idx))) { |
| return false; |
| } |
| } |
| return true; |
| }, |
| [&](const type::Array* a) { |
| if (!EmitType(out, a, builtin::AddressSpace::kUndefined, builtin::Access::kUndefined, |
| "")) { |
| return false; |
| } |
| |
| ScopedParen sp(out); |
| |
| auto count = a->ConstantCount(); |
| if (!count) { |
| diagnostics_.add_error(diag::System::Writer, |
| type::Array::kErrExpectedConstantCount); |
| return false; |
| } |
| |
| for (size_t i = 0; i < count; i++) { |
| if (i > 0) { |
| out << ", "; |
| } |
| if (!EmitConstant(out, constant->Index(i))) { |
| return false; |
| } |
| } |
| |
| return true; |
| }, |
| [&](const sem::Struct* s) { |
| if (!EmitStructType(&helpers_, s)) { |
| return false; |
| } |
| |
| out << StructName(s); |
| |
| ScopedParen sp(out); |
| |
| for (size_t i = 0; i < s->Members().Length(); i++) { |
| if (i > 0) { |
| out << ", "; |
| } |
| if (!EmitConstant(out, constant->Index(i))) { |
| return false; |
| } |
| } |
| |
| return true; |
| }, |
| [&](Default) { |
| diagnostics_.add_error( |
| diag::System::Writer, |
| "unhandled constant type: " + builder_.FriendlyName(constant->Type())); |
| return false; |
| }); |
| } |
| |
| bool GeneratorImpl::EmitLiteral(utils::StringStream& out, const ast::LiteralExpression* lit) { |
| return Switch( |
| lit, |
| [&](const ast::BoolLiteralExpression* l) { |
| out << (l->value ? "true" : "false"); |
| return true; |
| }, |
| [&](const ast::FloatLiteralExpression* l) { |
| if (l->suffix == ast::FloatLiteralExpression::Suffix::kH) { |
| PrintF16(out, static_cast<float>(l->value)); |
| } else { |
| PrintF32(out, static_cast<float>(l->value)); |
| } |
| return true; |
| }, |
| [&](const ast::IntLiteralExpression* i) { |
| switch (i->suffix) { |
| case ast::IntLiteralExpression::Suffix::kNone: |
| case ast::IntLiteralExpression::Suffix::kI: { |
| PrintI32(out, static_cast<int32_t>(i->value)); |
| return true; |
| } |
| case ast::IntLiteralExpression::Suffix::kU: { |
| out << i->value << "u"; |
| return true; |
| } |
| } |
| diagnostics_.add_error(diag::System::Writer, "unknown integer literal suffix type"); |
| return false; |
| }, |
| [&](Default) { |
| diagnostics_.add_error(diag::System::Writer, "unknown literal type"); |
| return false; |
| }); |
| } |
| |
| bool GeneratorImpl::EmitZeroValue(utils::StringStream& out, const type::Type* type) { |
| if (type->Is<type::Bool>()) { |
| out << "false"; |
| } else if (type->Is<type::F32>()) { |
| out << "0.0f"; |
| } else if (type->Is<type::F16>()) { |
| out << "0.0hf"; |
| } else if (type->Is<type::I32>()) { |
| out << "0"; |
| } else if (type->Is<type::U32>()) { |
| out << "0u"; |
| } else if (auto* vec = type->As<type::Vector>()) { |
| if (!EmitType(out, type, builtin::AddressSpace::kUndefined, builtin::Access::kReadWrite, |
| "")) { |
| return false; |
| } |
| ScopedParen sp(out); |
| for (uint32_t i = 0; i < vec->Width(); i++) { |
| if (i != 0) { |
| out << ", "; |
| } |
| if (!EmitZeroValue(out, vec->type())) { |
| return false; |
| } |
| } |
| } else if (auto* mat = type->As<type::Matrix>()) { |
| if (!EmitType(out, type, builtin::AddressSpace::kUndefined, builtin::Access::kReadWrite, |
| "")) { |
| return false; |
| } |
| ScopedParen sp(out); |
| for (uint32_t i = 0; i < (mat->rows() * mat->columns()); i++) { |
| if (i != 0) { |
| out << ", "; |
| } |
| if (!EmitZeroValue(out, mat->type())) { |
| return false; |
| } |
| } |
| } else if (auto* str = type->As<sem::Struct>()) { |
| if (!EmitType(out, type, builtin::AddressSpace::kUndefined, builtin::Access::kUndefined, |
| "")) { |
| return false; |
| } |
| bool first = true; |
| ScopedParen sp(out); |
| for (auto* member : str->Members()) { |
| if (!first) { |
| out << ", "; |
| } else { |
| first = false; |
| } |
| EmitZeroValue(out, member->Type()); |
| } |
| } else if (auto* arr = type->As<type::Array>()) { |
| if (!EmitType(out, type, builtin::AddressSpace::kUndefined, builtin::Access::kUndefined, |
| "")) { |
| return false; |
| } |
| ScopedParen sp(out); |
| |
| auto count = arr->ConstantCount(); |
| if (!count) { |
| diagnostics_.add_error(diag::System::Writer, type::Array::kErrExpectedConstantCount); |
| return false; |
| } |
| |
| for (uint32_t i = 0; i < count; i++) { |
| if (i != 0) { |
| out << ", "; |
| } |
| EmitZeroValue(out, arr->ElemType()); |
| } |
| } else { |
| diagnostics_.add_error(diag::System::Writer, "Invalid type for zero emission: " + |
| type->FriendlyName(builder_.Symbols())); |
| return false; |
| } |
| return true; |
| } |
| |
| bool GeneratorImpl::EmitLoop(const ast::LoopStatement* stmt) { |
| auto emit_continuing = [this, stmt]() { |
| if (stmt->continuing && !stmt->continuing->Empty()) { |
| if (!EmitBlock(stmt->continuing)) { |
| return false; |
| } |
| } |
| return true; |
| }; |
| |
| TINT_SCOPED_ASSIGNMENT(emit_continuing_, emit_continuing); |
| line() << "while (true) {"; |
| { |
| ScopedIndent si(this); |
| if (!EmitStatements(stmt->body->statements)) { |
| return false; |
| } |
| if (!emit_continuing_()) { |
| return false; |
| } |
| } |
| line() << "}"; |
| |
| return true; |
| } |
| |
| bool GeneratorImpl::EmitForLoop(const ast::ForLoopStatement* stmt) { |
| // Nest a for loop with a new block. In HLSL the initializer scope is not |
| // nested by the for-loop, so we may get variable redefinitions. |
| line() << "{"; |
| increment_indent(); |
| TINT_DEFER({ |
| decrement_indent(); |
| line() << "}"; |
| }); |
| |
| TextBuffer init_buf; |
| if (auto* init = stmt->initializer) { |
| TINT_SCOPED_ASSIGNMENT(current_buffer_, &init_buf); |
| if (!EmitStatement(init)) { |
| return false; |
| } |
| } |
| |
| TextBuffer cond_pre; |
| utils::StringStream cond_buf; |
| if (auto* cond = stmt->condition) { |
| TINT_SCOPED_ASSIGNMENT(current_buffer_, &cond_pre); |
| if (!EmitExpression(cond_buf, cond)) { |
| return false; |
| } |
| } |
| |
| TextBuffer cont_buf; |
| if (auto* cont = stmt->continuing) { |
| TINT_SCOPED_ASSIGNMENT(current_buffer_, &cont_buf); |
| if (!EmitStatement(cont)) { |
| return false; |
| } |
| } |
| |
| // If the for-loop has a multi-statement conditional and / or continuing, then |
| // we cannot emit this as a regular for-loop in HLSL. Instead we need to |
| // generate a `while(true)` loop. |
| bool emit_as_loop = cond_pre.lines.size() > 0 || cont_buf.lines.size() > 1; |
| |
| // If the for-loop has multi-statement initializer, or is going to be emitted |
| // as a `while(true)` loop, then declare the initializer statement(s) before |
| // the loop. |
| if (init_buf.lines.size() > 1 || (stmt->initializer && emit_as_loop)) { |
| current_buffer_->Append(init_buf); |
| init_buf.lines.clear(); // Don't emit the initializer again in the 'for' |
| } |
| |
| if (emit_as_loop) { |
| auto emit_continuing = [&]() { |
| current_buffer_->Append(cont_buf); |
| return true; |
| }; |
| |
| TINT_SCOPED_ASSIGNMENT(emit_continuing_, emit_continuing); |
| line() << "while (true) {"; |
| increment_indent(); |
| TINT_DEFER({ |
| decrement_indent(); |
| line() << "}"; |
| }); |
| |
| if (stmt->condition) { |
| current_buffer_->Append(cond_pre); |
| line() << "if (!(" << cond_buf.str() << ")) { break; }"; |
| } |
| |
| if (!EmitStatements(stmt->body->statements)) { |
| return false; |
| } |
| |
| if (!emit_continuing_()) { |
| return false; |
| } |
| } else { |
| // For-loop can be generated. |
|