#!amber

# 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 unreachable while loop

# The test passes because the shader always writes the color red.
# The rest of the code is never reached.

# Optimized using spirv-opt with the following arguments:
# '-O'
# spirv-opt commit hash: 6b072126595dd8c2448eb1fda616251c5e6d7079


SHADER vertex variant_vertex_shader PASSTHROUGH

# variant_fragment_shader is derived from the following GLSL:
# #version 310 es
# precision highp float;
#
# layout(location = 0) out vec4 _GLF_color;
#
# layout(set = 0, binding = 0) uniform buf0
# {
#     vec2 injectionSwitch;
# };
#
# float deadCode()
# {
#     float s;
#     for (int i = 1; true; 1)
#     {
#         if (gl_FragCoord.x < 0.0)
#         {
#             if (injectionSwitch.x > 1.0)
#             {
#                 return 1.0;
#             }
#             continue;
#         }
#         return s;
#     }
#     return 1.0;
# }
#
# void main()
# {
#     if (injectionSwitch.x > 1.0) // Always false
#     {
#         vec4 c;
#         c.y = deadCode();
#         _GLF_color = c;
#     }
#
#     // Always write color red because the other code is never reached.
#     _GLF_color = vec4(1.0, 0.0, 0.0, 1.0);
# }
SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0
; SPIR-V
; Version: 1.0
; Generator: Khronos Glslang Reference Front End; 7
; Bound: 120
; Schema: 0
               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %4 "main" %23 %64
               OpExecutionMode %4 OriginUpperLeft
               OpSource ESSL 310
               OpName %4 "main"
               OpName %23 "gl_FragCoord"
               OpName %34 "buf0"
               OpMemberName %34 0 "injectionSwitch"
               OpName %36 ""
               OpName %64 "_GLF_color"
               OpDecorate %23 BuiltIn FragCoord
               OpMemberDecorate %34 0 Offset 0
               OpDecorate %34 Block
               OpDecorate %36 DescriptorSet 0
               OpDecorate %36 Binding 0
               OpDecorate %64 Location 0
          %2 = OpTypeVoid
          %3 = OpTypeFunction %2
          %6 = OpTypeFloat 32
         %10 = OpTypeInt 32 1
         %19 = OpTypeBool
         %21 = OpTypeVector %6 4
         %22 = OpTypePointer Input %21
         %23 = OpVariable %22 Input
         %24 = OpTypeInt 32 0
         %25 = OpConstant %24 0
         %26 = OpTypePointer Input %6
         %29 = OpConstant %6 0
         %33 = OpTypeVector %6 2
         %34 = OpTypeStruct %33
         %35 = OpTypePointer Uniform %34
         %36 = OpVariable %35 Uniform
         %37 = OpConstant %10 0
         %38 = OpTypePointer Uniform %6
         %41 = OpConstant %6 1
         %63 = OpTypePointer Output %21
         %64 = OpVariable %63 Output
         %66 = OpConstantComposite %21 %41 %29 %29 %41
        %110 = OpUndef %6
        %118 = OpUndef %21
          %4 = OpFunction %2 None %3
          %5 = OpLabel
         %53 = OpAccessChain %38 %36 %37 %25
         %54 = OpLoad %6 %53
         %55 = OpFOrdGreaterThan %19 %54 %41
               OpSelectionMerge %57 None
               OpBranchConditional %55 %56 %57
         %56 = OpLabel
               OpBranch %83
         %83 = OpLabel
               OpLoopMerge %84 %85 None
               OpBranch %87
         %87 = OpLabel
               OpLoopMerge %88 %100 None
               OpBranch %91
         %91 = OpLabel
         %92 = OpAccessChain %26 %23 %25
         %93 = OpLoad %6 %92
         %94 = OpFOrdLessThan %19 %93 %29
               OpSelectionMerge %95 None
               OpBranchConditional %94 %96 %95
         %96 = OpLabel
               OpSelectionMerge %119 None
               OpBranchConditional %55 %101 %100
        %101 = OpLabel
               OpBranch %88
        %119 = OpLabel
               OpBranch %100
        %100 = OpLabel
               OpBranch %87
         %95 = OpLabel
               OpBranch %88
         %88 = OpLabel
        %113 = OpPhi %6 %41 %101 %110 %95
               OpBranch %84
         %85 = OpLabel
               OpBranch %83
         %84 = OpLabel
        %107 = OpCompositeInsert %21 %113 %118 1
               OpStore %64 %107
               OpBranch %57
         %57 = OpLabel
               OpStore %64 %66
               OpReturn
               OpFunctionEnd
END

# uniforms for variant

# injectionSwitch
BUFFER variant_injectionSwitch DATA_TYPE vec2<float> DATA
 0.0 1.0
END

BUFFER variant_framebuffer FORMAT B8G8R8A8_UNORM

PIPELINE graphics variant_pipeline
  ATTACH variant_vertex_shader
  ATTACH variant_fragment_shader
  FRAMEBUFFER_SIZE 256 256
  BIND BUFFER variant_framebuffer AS color LOCATION 0
  BIND BUFFER variant_injectionSwitch 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 256 256

EXPECT variant_framebuffer IDX 0 0 SIZE 256 256 EQ_RGBA 255 0 0 255