# 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 that uses a while loop inside a switch.
# Derived from the following GLSL fragment shader.
# We check that the top-left pixel is red. The test passes because the
# first if statement checks if the x coordinate is less than 10 and if so writes
# red to _GLF_color and then returns.

# #version 310 es
#
# precision highp float;
# precision highp int;
#
# layout(location = 0) out vec4 _GLF_color;
#
# layout(set = 0, binding = 0) uniform buf0 {
#   vec2 injectionSwitch;
# };
#
# void main()
# {
#   if (gl_FragCoord.x < 10.0) {
#     _GLF_color = vec4(1.0, 0.0, 0.0, 1.0);
#     return;
#   }
#   switch(int(injectionSwitch.x))
#   {
#     case 0:
#       while(bool(1.0))
#       {
#         discard;
#       }
#   }
#   _GLF_color = vec4(1.0, 0.0, 0.0, 1.0);
#   return;
# }

[vertex shader passthrough]

[fragment shader spirv]
; SPIR-V
; Version: 1.0
; Generator: Khronos Glslang Reference Front End; 7
; Bound: 51
; Schema: 0
               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %main "main" %gl_FragCoord %_GLF_color
               OpExecutionMode %main OriginUpperLeft
               OpSource ESSL 310
               OpName %main "main"
               OpName %gl_FragCoord "gl_FragCoord"
               OpName %_GLF_color "_GLF_color"
               OpName %buf0 "buf0"
               OpMemberName %buf0 0 "injectionSwitch"
               OpName %_ ""
               OpDecorate %gl_FragCoord BuiltIn FragCoord
               OpDecorate %_GLF_color Location 0
               OpMemberDecorate %buf0 0 Offset 0
               OpDecorate %buf0 Block
               OpDecorate %_ DescriptorSet 0
               OpDecorate %_ Binding 0
       %void = OpTypeVoid
          %3 = OpTypeFunction %void
      %float = OpTypeFloat 32
    %v4float = OpTypeVector %float 4
%_ptr_Input_v4float = OpTypePointer Input %v4float
%gl_FragCoord = OpVariable %_ptr_Input_v4float Input
       %uint = OpTypeInt 32 0
     %uint_0 = OpConstant %uint 0
%_ptr_Input_float = OpTypePointer Input %float
   %float_10 = OpConstant %float 10
       %bool = OpTypeBool
%_ptr_Output_v4float = OpTypePointer Output %v4float
 %_GLF_color = OpVariable %_ptr_Output_v4float Output
    %float_1 = OpConstant %float 1
    %float_0 = OpConstant %float 0
         %24 = OpConstantComposite %v4float %float_1 %float_0 %float_0 %float_1
    %v2float = OpTypeVector %float 2
       %buf0 = OpTypeStruct %v2float
%_ptr_Uniform_buf0 = OpTypePointer Uniform %buf0
          %_ = OpVariable %_ptr_Uniform_buf0 Uniform
        %int = OpTypeInt 32 1
      %int_0 = OpConstant %int 0
%_ptr_Uniform_float = OpTypePointer Uniform %float
       %main = OpFunction %void None %3
          %5 = OpLabel
               OpBranch %48
         %48 = OpLabel
               OpLoopMerge %47 %50 None
               OpBranch %49
         %49 = OpLabel
         %13 = OpAccessChain %_ptr_Input_float %gl_FragCoord %uint_0
         %14 = OpLoad %float %13
         %17 = OpFOrdLessThan %bool %14 %float_10
               OpSelectionMerge %19 None
               OpBranchConditional %17 %18 %19
         %18 = OpLabel
               OpStore %_GLF_color %24
               OpBranch %47
         %19 = OpLabel
         %33 = OpAccessChain %_ptr_Uniform_float %_ %int_0 %uint_0
         %34 = OpLoad %float %33
         %35 = OpConvertFToS %int %34
               OpSelectionMerge %37 None
               OpSwitch %35 %37 0 %36
         %36 = OpLabel
               OpBranch %38
         %38 = OpLabel
               OpLoopMerge %40 %41 None
               OpBranch %39
         %39 = OpLabel
               OpKill
         %41 = OpLabel
               OpBranch %38
         %40 = OpLabel
               OpUnreachable
         %37 = OpLabel
               OpStore %_GLF_color %24
               OpBranch %47
         %50 = OpLabel
               OpBranch %48
         %47 = OpLabel
               OpReturn
               OpFunctionEnd


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