#!amber # Copyright 2022 Google LLC # # 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. # A test for a coverage-gap found by the GraphicsFuzz project. # Short description: A fragment shader that covers specific LLVM code paths # The test passes because the shader always writes red. # Optimized using spirv-opt with the following arguments: # '--eliminate-dead-branches' # '--if-conversion' # '--redundancy-elimination' # spirv-opt commit hash: a0370efd589be33d5d9a85cfde2f85841b3755af SHADER vertex variant_vertex_shader PASSTHROUGH # variant_fragment_shader is derived from the following GLSL: # #version 320 es # #define _int_0 _GLF_uniform_int_values[0] # #define _int_1 _GLF_uniform_int_values[1] # #define _int_2 _GLF_uniform_int_values[2] # # precision highp float; # precision highp int; # # // Contents of _GLF_uniform_int_values: [0, 1, 2] # layout(set = 0, binding = 0) uniform buf0 # { # int _GLF_uniform_int_values[3]; # }; # # layout(location = 0) out vec4 _GLF_color; # # const int _GLF_global_loop_bound = 10; # int _GLF_global_loop_count = 0; # # struct S # { # int data0; # int data1; # }; # # void main() # { # int a = _int_0; # # // Iterates once. # while(_GLF_global_loop_count < _GLF_global_loop_bound) # { # _GLF_global_loop_count++; # # // Iterates until the global loop count is reached. # while(a != 1 && _GLF_global_loop_count < _GLF_global_loop_bound) # { # _GLF_global_loop_count++; # # // a becomes 2. # a = S(_int_1, 2).data1; # } # } # # // Always true. # if(a == _int_2) # { # _GLF_color = vec4(_int_1, _int_0, _int_0, _int_1); # } # else # { # _GLF_color = vec4(_int_0); # } # } SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0 ; SPIR-V ; Version: 1.0 ; Generator: Khronos Glslang Reference Front End; 10 ; Bound: 79 ; Schema: 0 OpCapability Shader %1 = OpExtInstImport "GLSL.std.450" OpMemoryModel Logical GLSL450 OpEntryPoint Fragment %4 "main" %60 OpExecutionMode %4 OriginUpperLeft OpSource ESSL 320 OpName %4 "main" OpName %8 "_GLF_global_loop_count" OpName %11 "a" OpName %15 "buf0" OpMemberName %15 0 "_GLF_uniform_int_values" OpName %17 "" OpName %48 "S" OpMemberName %48 0 "data0" OpMemberName %48 1 "data1" OpName %60 "_GLF_color" OpDecorate %14 ArrayStride 16 OpMemberDecorate %15 0 Offset 0 OpDecorate %15 Block OpDecorate %17 DescriptorSet 0 OpDecorate %17 Binding 0 OpDecorate %60 Location 0 %2 = OpTypeVoid %3 = OpTypeFunction %2 %6 = OpTypeInt 32 1 %7 = OpTypePointer Private %6 %8 = OpVariable %7 Private %9 = OpConstant %6 0 %10 = OpTypePointer Function %6 %12 = OpTypeInt 32 0 %13 = OpConstant %12 3 %14 = OpTypeArray %6 %13 %15 = OpTypeStruct %14 %16 = OpTypePointer Uniform %15 %17 = OpVariable %16 Uniform %18 = OpTypePointer Uniform %6 %27 = OpConstant %6 10 %28 = OpTypeBool %31 = OpConstant %6 1 %47 = OpConstant %6 2 %48 = OpTypeStruct %6 %6 %57 = OpTypeFloat 32 %58 = OpTypeVector %57 4 %59 = OpTypePointer Output %58 %60 = OpVariable %59 Output %4 = OpFunction %2 None %3 %5 = OpLabel %11 = OpVariable %10 Function OpStore %8 %9 %19 = OpAccessChain %18 %17 %9 %9 %20 = OpLoad %6 %19 OpStore %11 %20 OpBranch %21 %21 = OpLabel OpLoopMerge %23 %24 None OpBranch %25 %25 = OpLabel %26 = OpLoad %6 %8 %29 = OpSLessThan %28 %26 %27 OpBranchConditional %29 %22 %23 %22 = OpLabel %30 = OpLoad %6 %8 %32 = OpIAdd %6 %30 %31 OpStore %8 %32 OpBranch %33 %33 = OpLabel OpLoopMerge %35 %36 None OpBranch %37 %37 = OpLabel %38 = OpLoad %6 %11 %39 = OpINotEqual %28 %38 %31 %40 = OpLoad %6 %8 %41 = OpSLessThan %28 %40 %27 %42 = OpLogicalAnd %28 %39 %41 OpBranchConditional %42 %34 %35 %34 = OpLabel %43 = OpLoad %6 %8 %44 = OpIAdd %6 %43 %31 OpStore %8 %44 %45 = OpAccessChain %18 %17 %9 %31 %46 = OpLoad %6 %45 %49 = OpCompositeConstruct %48 %46 %47 %50 = OpCompositeExtract %6 %49 1 OpStore %11 %50 OpBranch %36 %36 = OpLabel OpBranch %33 %35 = OpLabel OpBranch %24 %24 = OpLabel OpBranch %21 %23 = OpLabel %51 = OpLoad %6 %11 %52 = OpAccessChain %18 %17 %9 %47 %53 = OpLoad %6 %52 %54 = OpIEqual %28 %51 %53 OpSelectionMerge %56 None OpBranchConditional %54 %55 %74 %55 = OpLabel %61 = OpAccessChain %18 %17 %9 %31 %62 = OpLoad %6 %61 %63 = OpConvertSToF %57 %62 %66 = OpConvertSToF %57 %20 %73 = OpCompositeConstruct %58 %63 %66 %66 %63 OpStore %60 %73 OpBranch %56 %74 = OpLabel %77 = OpConvertSToF %57 %20 %78 = OpCompositeConstruct %58 %77 %77 %77 %77 OpStore %60 %78 OpBranch %56 %56 = OpLabel OpReturn OpFunctionEnd END # uniforms for variant # _GLF_uniform_int_values BUFFER variant__GLF_uniform_int_values DATA_TYPE int32[] STD140 DATA 0 1 2 END BUFFER variant_framebuffer FORMAT B8G8R8A8_UNORM PIPELINE graphics variant_pipeline ATTACH variant_vertex_shader ATTACH variant_fragment_shader FRAMEBUFFER_SIZE 32 32 BIND BUFFER variant_framebuffer AS color LOCATION 0 BIND BUFFER variant__GLF_uniform_int_values AS uniform DESCRIPTOR_SET 0 BINDING 0 END CLEAR_COLOR variant_pipeline 0 0 0 255 CLEAR variant_pipeline RUN variant_pipeline DRAW_RECT POS 0 0 SIZE 32 32 EXPECT variant_framebuffer IDX 0 0 SIZE 32 32 EQ_RGBA 255 0 0 255