# Copyright 2019 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.

# Short description: A fragment shader with return in nest of ifs, inside loop

# The test passes because the fragment shader writes a red pixel, and then
# terminates without further output manipulation (the other write of red
# is not dynamically reachable)

# Derived from the following GLSL.

# Fragment shader GLSL:
# #version 310 es
#
# precision highp float;
#
# layout(location = 0) out vec4 _GLF_color;
#
# layout(set = 0, binding = 0) uniform buf0 {
#  vec2 injectionSwitch;
# };
#
# void main()
# {
#  _GLF_color = vec4(1.0, 0.0, 0.0, 1.0);
#  for(
#      int i = 0;
#      i < 10;
#      i ++
#  )
#   {
#    _GLF_color = vec4(1.0);
#    if(1.0 > injectionSwitch.y)
#     {
#      _GLF_color = vec4(1.0, 0.0, 0.0, 1.0);
#      if(true)
#       {
#        return;
#       }
#     }
#   }
# }

[require]
fbsize 256 256

[vertex shader passthrough]

[fragment shader spirv]
; SPIR-V
; Version: 1.0
; Generator: Khronos Glslang Reference Front End; 7
; Bound: 46
; Schema: 0
               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %4 "main" %9
               OpExecutionMode %4 OriginUpperLeft
               OpSource ESSL 310
               OpName %4 "main"
               OpName %9 "_GLF_color"
               OpName %15 "i"
               OpName %28 "buf0"
               OpMemberName %28 0 "injectionSwitch"
               OpName %30 ""
               OpDecorate %9 Location 0
               OpDecorate %15 RelaxedPrecision
               OpDecorate %22 RelaxedPrecision
               OpMemberDecorate %28 0 Offset 0
               OpDecorate %28 Block
               OpDecorate %30 DescriptorSet 0
               OpDecorate %30 Binding 0
               OpDecorate %43 RelaxedPrecision
               OpDecorate %45 RelaxedPrecision
          %2 = OpTypeVoid
          %3 = OpTypeFunction %2
          %6 = OpTypeFloat 32
          %7 = OpTypeVector %6 4
          %8 = OpTypePointer Output %7
          %9 = OpVariable %8 Output
         %10 = OpConstant %6 1
         %11 = OpConstant %6 0
         %12 = OpConstantComposite %7 %10 %11 %11 %10
         %13 = OpTypeInt 32 1
         %14 = OpTypePointer Function %13
         %16 = OpConstant %13 0
         %23 = OpConstant %13 10
         %24 = OpTypeBool
         %26 = OpConstantComposite %7 %10 %10 %10 %10
         %27 = OpTypeVector %6 2
         %28 = OpTypeStruct %27
         %29 = OpTypePointer Uniform %28
         %30 = OpVariable %29 Uniform
         %31 = OpTypeInt 32 0
         %32 = OpConstant %31 1
         %33 = OpTypePointer Uniform %6
         %39 = OpConstantTrue %24
         %44 = OpConstant %13 1
          %4 = OpFunction %2 None %3
          %5 = OpLabel
         %15 = OpVariable %14 Function
               OpStore %9 %12
               OpStore %15 %16
               OpBranch %17
         %17 = OpLabel
               OpLoopMerge %19 %20 None
               OpBranch %21
         %21 = OpLabel
         %22 = OpLoad %13 %15
         %25 = OpSLessThan %24 %22 %23
               OpBranchConditional %25 %18 %19
         %18 = OpLabel
               OpStore %9 %26
         %34 = OpAccessChain %33 %30 %16 %32
         %35 = OpLoad %6 %34
         %36 = OpFOrdGreaterThan %24 %10 %35
               OpSelectionMerge %38 None
               OpBranchConditional %36 %37 %38
         %37 = OpLabel
               OpStore %9 %12
               OpSelectionMerge %41 None
               OpBranchConditional %39 %40 %41
         %40 = OpLabel
               OpReturn
         %41 = OpLabel
               OpBranch %38
         %38 = OpLabel
               OpBranch %20
         %20 = OpLabel
         %43 = OpLoad %13 %15
         %45 = OpIAdd %13 %43 %44
               OpStore %15 %45
               OpBranch %17
         %19 = OpLabel
               OpReturn
               OpFunctionEnd


[test]
## Uniforms
# injectionSwitch
uniform ubo 0:0 vec2 0 0.0 1.0

draw rect -1 -1 2 2
probe rgba (0, 0) (1, 1, 1, 1)