control-flow-switch.amber

# Copyright 2018 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 bug found by GraphicsFuzz.
# A fragment shader with somewhat complex control flow and a switch.
# Derived from the following GLSL fragment shader.
# We check that all pixels are red. The test passes because the final
# statement writes red to _GLF_color and there are no discard statments.

# #version 310 es
#
# precision highp float;
# precision highp int;
#
# layout(set = 0, binding = 0) uniform buf0 {
#  vec2 injectionSwitch;
# };
# layout(location=0) out vec4 _GLF_color;
#
# struct S {
#  bool ok;
# };
#
# bool g()
# {
#  for(
#      int i = 0;
#      i < 1;
#      i++
#  )
#   {
#    switch(int(injectionSwitch.x))
#     {
#      case 9:
#      S a = S(bool(injectionSwitch.x));
#      S b = a;
#      case 42:
#      if(b.ok)
#       {
#        return true;
#       }
#       default:
#       break;
#     }
#   }
#  return true;
# }
# vec3 f()
# {
#  {
#   S a = S(bool(injectionSwitch.x));
#   if(a.ok)
#    {
#     return vec3(0.0);
#    }
#   if(g())
#    {
#     return vec3(1.0);
#    }
#  }
#  return vec3(1.0);
# }
# void main()
# {
#  _GLF_color = vec4(f(), 1.0);
#  // always true at runtime
#  if (injectionSwitch.x == 0.0) {
#   _GLF_color = vec4(1.0, 0.0, 0.0, 1.0);
#  }
# }

[vertex shader passthrough]

[fragment shader spirv]
; SPIR-V
; Version: 1.0
; Generator: Khronos Glslang Reference Front End; 7
; Bound: 195
; Schema: 0
               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %main "main" %_GLF_color
               OpExecutionMode %main OriginUpperLeft
               OpSource ESSL 310
               OpName %main "main"
               OpName %buf0 "buf0"
               OpMemberName %buf0 0 "injectionSwitch"
               OpName %_ ""
               OpName %_GLF_color "_GLF_color"
               OpMemberDecorate %buf0 0 Offset 0
               OpDecorate %buf0 Block
               OpDecorate %_ DescriptorSet 0
               OpDecorate %_ Binding 0
               OpDecorate %_GLF_color Location 0
       %void = OpTypeVoid
          %3 = OpTypeFunction %void
       %bool = OpTypeBool
      %float = OpTypeFloat 32
    %v3float = OpTypeVector %float 3
        %int = OpTypeInt 32 1
      %int_0 = OpConstant %int 0
      %int_1 = OpConstant %int 1
    %v2float = OpTypeVector %float 2
       %buf0 = OpTypeStruct %v2float
%_ptr_Uniform_buf0 = OpTypePointer Uniform %buf0
          %_ = OpVariable %_ptr_Uniform_buf0 Uniform
       %uint = OpTypeInt 32 0
     %uint_0 = OpConstant %uint 0
%_ptr_Uniform_float = OpTypePointer Uniform %float
    %float_0 = OpConstant %float 0
       %true = OpConstantTrue %bool
         %73 = OpConstantComposite %v3float %float_0 %float_0 %float_0
    %float_1 = OpConstant %float 1
         %79 = OpConstantComposite %v3float %float_1 %float_1 %float_1
    %v4float = OpTypeVector %float 4
%_ptr_Output_v4float = OpTypePointer Output %v4float
 %_GLF_color = OpVariable %_ptr_Output_v4float Output
         %96 = OpConstantComposite %v4float %float_1 %float_0 %float_0 %float_1
      %false = OpConstantFalse %bool
        %182 = OpUndef %bool
       %main = OpFunction %void None %3
          %5 = OpLabel
               OpBranch %119
        %119 = OpLabel
               OpLoopMerge %120 %121 None
               OpBranch %122
        %122 = OpLabel
        %123 = OpAccessChain %_ptr_Uniform_float %_ %int_0 %uint_0
        %124 = OpLoad %float %123
        %125 = OpFOrdNotEqual %bool %124 %float_0
               OpSelectionMerge %129 None
               OpBranchConditional %125 %130 %129
        %130 = OpLabel
               OpBranch %120
        %129 = OpLabel
               OpBranch %141
        %141 = OpLabel
               OpLoopMerge %142 %143 None
               OpBranch %145
        %145 = OpLabel
        %179 = OpPhi %bool %182 %141 %194 %156
        %177 = OpPhi %int %int_0 %141 %169 %156
        %150 = OpSLessThan %bool %177 %int_1
               OpLoopMerge %146 %156 None
               OpBranchConditional %150 %151 %146
        %151 = OpLabel
        %154 = OpConvertFToS %int %124
               OpSelectionMerge %156 None
               OpSwitch %154 %156 9 %157 42 %158
        %156 = OpLabel
        %194 = OpPhi %bool %179 %151 %178 %166
        %169 = OpIAdd %int %177 %int_1
               OpBranch %145
        %157 = OpLabel
               OpBranch %158
        %158 = OpLabel
        %178 = OpPhi %bool %179 %151 %125 %157
               OpSelectionMerge %166 None
               OpBranchConditional %178 %167 %166
        %167 = OpLabel
               OpBranch %146
        %166 = OpLabel
               OpBranch %156
        %146 = OpLabel
        %187 = OpPhi %bool %182 %145 %true %167
        %183 = OpPhi %bool %false %145 %true %167
               OpSelectionMerge %171 None
               OpBranchConditional %183 %142 %171
        %171 = OpLabel
               OpBranch %142
        %143 = OpLabel
               OpBranch %141
        %142 = OpLabel
        %186 = OpPhi %bool %187 %146 %true %171
               OpSelectionMerge %132 None
               OpBranchConditional %186 %133 %132
        %133 = OpLabel
               OpBranch %120
        %132 = OpLabel
               OpBranch %120
        %121 = OpLabel
               OpBranch %119
        %120 = OpLabel
        %193 = OpPhi %v3float %73 %130 %79 %133 %79 %132
         %87 = OpCompositeExtract %float %193 0
         %88 = OpCompositeExtract %float %193 1
         %89 = OpCompositeExtract %float %193 2
         %90 = OpCompositeConstruct %v4float %87 %88 %89 %float_1
               OpStore %_GLF_color %90
         %93 = OpFOrdEqual %bool %124 %float_0
               OpSelectionMerge %95 None
               OpBranchConditional %93 %94 %95
         %94 = OpLabel
               OpStore %_GLF_color %96
               OpBranch %95
         %95 = OpLabel
               OpReturn
               OpFunctionEnd


[test]
uniform ubo 0:0 vec2 0 0.0 1.0
draw rect -1 -1 2 2
probe all rgba 1 0 0 1