| // Copyright 2023 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/lang/spirv/writer/common/helper_test.h" |
| |
| namespace tint::spirv::writer { |
| namespace { |
| |
| using namespace tint::core::fluent_types; // NOLINT |
| using namespace tint::core::number_suffixes; // NOLINT |
| |
| TEST_F(SpirvWriterTest, Discard) { |
| auto* buffer = b.Var("buffer", ty.ptr<storage, i32>()); |
| buffer->SetBindingPoint(0, 0); |
| b.RootBlock()->Append(buffer); |
| |
| auto* front_facing = b.FunctionParam("front_facing", ty.bool_()); |
| front_facing->SetBuiltin(core::ir::FunctionParam::Builtin::kFrontFacing); |
| auto* ep = b.Function("ep", ty.f32(), core::ir::Function::PipelineStage::kFragment); |
| ep->SetParams({front_facing}); |
| ep->SetReturnLocation(0_u, {}); |
| |
| b.Append(ep->Block(), [&] { |
| auto* ifelse = b.If(front_facing); |
| b.Append(ifelse->True(), [&] { // |
| b.Discard(); |
| b.ExitIf(ifelse); |
| }); |
| b.Store(buffer, 42_i); |
| b.Return(ep, 0.5_f); |
| }); |
| |
| ASSERT_TRUE(Generate()) << Error() << output_; |
| EXPECT_INST(R"( |
| %ep_inner = OpFunction %float None %16 |
| %front_facing = OpFunctionParameter %bool |
| %17 = OpLabel |
| OpSelectionMerge %18 None |
| OpBranchConditional %front_facing %19 %18 |
| %19 = OpLabel |
| OpStore %continue_execution %false |
| OpBranch %18 |
| %18 = OpLabel |
| %21 = OpAccessChain %_ptr_StorageBuffer_int %1 %uint_0 |
| %25 = OpLoad %bool %continue_execution |
| OpSelectionMerge %26 None |
| OpBranchConditional %25 %27 %26 |
| %27 = OpLabel |
| OpStore %21 %int_42 |
| OpBranch %26 |
| %26 = OpLabel |
| %29 = OpLoad %bool %continue_execution |
| %30 = OpLogicalEqual %bool %29 %false |
| OpSelectionMerge %31 None |
| OpBranchConditional %30 %32 %31 |
| %32 = OpLabel |
| OpKill |
| %31 = OpLabel |
| OpReturnValue %float_0_5 |
| OpFunctionEnd |
| )"); |
| } |
| |
| } // namespace |
| } // namespace tint::spirv::writer |