1#!amber 2 3# Copyright 2019 Google LLC 4# 5# Licensed under the Apache License, Version 2.0 (the "License"); 6# you may not use this file except in compliance with the License. 7# You may obtain a copy of the License at 8# 9# http://www.apache.org/licenses/LICENSE-2.0 10# 11# Unless required by applicable law or agreed to in writing, software 12# distributed under the License is distributed on an "AS IS" BASIS, 13# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14# See the License for the specific language governing permissions and 15# limitations under the License. 16 17 18# A test for a bug found by GraphicsFuzz. 19 20# Short description: A fragment shader with an always false if. 21 22# The test passes because the shader always writes color red. 23# Function brick() writes red in the beginning and returns in the end. 24 25# Optimized using spirv-opt with the following arguments: 26# '--eliminate-dead-branches' 27# '--merge-blocks' 28# '--inline-entry-points-exhaustive' 29# '--scalar-replacement=100' 30# '--eliminate-local-single-block' 31# '--eliminate-local-single-block' 32# '--eliminate-dead-branches' 33# '--merge-blocks' 34# '--eliminate-dead-code-aggressive' 35# '--eliminate-dead-branches' 36# '--convert-local-access-chains' 37# '--scalar-replacement=100' 38# '--reduce-load-size' 39# '--scalar-replacement=100' 40# '--redundancy-elimination' 41# '--convert-local-access-chains' 42# '--eliminate-dead-branches' 43# '--merge-blocks' 44# '--eliminate-dead-branches' 45# '--vector-dce' 46# '--eliminate-local-single-block' 47# '--private-to-local' 48# '--copy-propagate-arrays' 49# '--eliminate-dead-branches' 50# '--redundancy-elimination' 51# '--vector-dce' 52# '--scalar-replacement=100' 53# '--eliminate-local-multi-store' 54# '--scalar-replacement=100' 55# '--redundancy-elimination' 56# '--redundancy-elimination' 57# '--copy-propagate-arrays' 58# spirv-opt commit hash: 6b072126595dd8c2448eb1fda616251c5e6d7079 59 60 61 62SHADER vertex variant_vertex_shader PASSTHROUGH 63 64# variant_fragment_shader is derived from the following GLSL: 65# #version 310 es 66# precision highp float; 67# 68# layout(set = 0, binding = 0) uniform buf0 69# { 70# vec2 injectionSwitch; 71# }; 72# 73# layout(location = 0) out vec4 _GLF_color; 74# 75# vec2 brick(vec2 uv) 76# { 77# _GLF_color = vec4(1.0, 0.0, 0.0, 1.0); // Write color red 78# 79# int a; 80# do 81# { 82# if (injectionSwitch.y < 0.0) // Always false 83# { 84# return vec2(1.0); 85# } 86# uv.y -= 1.0; 87# } while (false); 88# 89# uv.y -= 1.0; 90# return vec2(1.0); 91# } 92# 93# void main() 94# { 95# brick(vec2(1.0)); 96# } 97SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0 98; SPIR-V 99; Version: 1.0 100; Generator: Khronos Glslang Reference Front End; 7 101; Bound: 54 102; Schema: 0 103 OpCapability Shader 104 %1 = OpExtInstImport "GLSL.std.450" 105 OpMemoryModel Logical GLSL450 106 OpEntryPoint Fragment %4 "main" %15 107 OpExecutionMode %4 OriginUpperLeft 108 OpSource ESSL 310 109 OpName %4 "main" 110 OpName %11 "brick(vf2;" 111 OpName %10 "uv" 112 OpName %15 "_GLF_color" 113 OpName %23 "buf0" 114 OpMemberName %23 0 "injectionSwitch" 115 OpName %25 "" 116 OpName %51 "param" 117 OpDecorate %15 Location 0 118 OpMemberDecorate %23 0 Offset 0 119 OpDecorate %23 Block 120 OpDecorate %25 DescriptorSet 0 121 OpDecorate %25 Binding 0 122 %2 = OpTypeVoid 123 %3 = OpTypeFunction %2 124 %6 = OpTypeFloat 32 125 %7 = OpTypeVector %6 2 126 %8 = OpTypePointer Function %7 127 %9 = OpTypeFunction %7 %8 128 %13 = OpTypeVector %6 4 129 %14 = OpTypePointer Output %13 130 %15 = OpVariable %14 Output 131 %16 = OpConstant %6 1 132 %17 = OpConstant %6 0 133 %18 = OpConstantComposite %13 %16 %17 %17 %16 134 %23 = OpTypeStruct %7 135 %24 = OpTypePointer Uniform %23 136 %25 = OpVariable %24 Uniform 137 %26 = OpTypeInt 32 1 138 %27 = OpConstant %26 0 139 %28 = OpTypeInt 32 0 140 %29 = OpConstant %28 1 141 %30 = OpTypePointer Uniform %6 142 %33 = OpTypeBool 143 %37 = OpConstantComposite %7 %16 %16 144 %39 = OpTypePointer Function %6 145 %44 = OpConstantFalse %33 146 %4 = OpFunction %2 None %3 147 %5 = OpLabel 148 %51 = OpVariable %8 Function 149 OpStore %51 %37 150 %52 = OpFunctionCall %7 %11 %51 151 OpReturn 152 OpFunctionEnd 153 %11 = OpFunction %7 None %9 154 %10 = OpFunctionParameter %8 155 %12 = OpLabel 156 OpStore %15 %18 157 OpBranch %19 158 %19 = OpLabel 159 OpLoopMerge %21 %36 None 160 OpBranch %20 161 %20 = OpLabel 162 %31 = OpAccessChain %30 %25 %27 %29 163 %32 = OpLoad %6 %31 164 %34 = OpFOrdLessThan %33 %32 %17 165 OpSelectionMerge %53 None 166 OpBranchConditional %34 %35 %36 167 %35 = OpLabel 168 OpReturnValue %37 169 %53 = OpLabel 170 OpBranch %36 171 %36 = OpLabel 172 %40 = OpAccessChain %39 %10 %29 173 %41 = OpLoad %6 %40 174 %42 = OpFSub %6 %41 %16 175 OpStore %40 %42 176 OpBranchConditional %44 %19 %21 177 %21 = OpLabel 178 %46 = OpLoad %6 %40 179 %47 = OpFSub %6 %46 %16 180 OpStore %40 %47 181 OpReturnValue %37 182 OpFunctionEnd 183END 184 185# uniforms for variant 186 187# injectionSwitch 188BUFFER variant_injectionSwitch DATA_TYPE vec2<float> DATA 189 0.0 1.0 190END 191 192BUFFER variant_framebuffer FORMAT B8G8R8A8_UNORM 193 194PIPELINE graphics variant_pipeline 195 ATTACH variant_vertex_shader 196 ATTACH variant_fragment_shader 197 FRAMEBUFFER_SIZE 256 256 198 BIND BUFFER variant_framebuffer AS color LOCATION 0 199 BIND BUFFER variant_injectionSwitch AS uniform DESCRIPTOR_SET 0 BINDING 0 200END 201CLEAR_COLOR variant_pipeline 0 0 0 255 202 203CLEAR variant_pipeline 204RUN variant_pipeline DRAW_RECT POS 0 0 SIZE 256 256 205 206EXPECT variant_framebuffer IDX 0 0 SIZE 256 256 EQ_RGBA 255 0 0 255 207