#!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 discard and add in function in loop

# The test passes because main always outputs the color red and returns.
# red() has an unreachable discard and adds zero to the returned value.

# 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;
# };
#
# vec4 red()
# {
#   if(injectionSwitch.x > 0.0) // always false
#     discard;
#
#   return vec4(1.0, 0.0, 0.0, 1.0) + injectionSwitch.x; // add zero
# }
#
# void main()
# {
#   while(true)
#   {
#     while(injectionSwitch.y > 0.0) // always true
#     {
#       _GLF_color = red();
#       return;
#     }
#   }
# }
SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0
; SPIR-V
; Version: 1.0
; Generator: Khronos Glslang Reference Front End; 7
; Bound: 102
; Schema: 0
               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %4 "main" %52
               OpExecutionMode %4 OriginUpperLeft
               OpSource ESSL 310
               OpName %4 "main"
               OpName %12 "buf0"
               OpMemberName %12 0 "injectionSwitch"
               OpName %14 ""
               OpName %52 "_GLF_color"
               OpMemberDecorate %12 0 Offset 0
               OpDecorate %12 Block
               OpDecorate %14 DescriptorSet 0
               OpDecorate %14 Binding 0
               OpDecorate %52 Location 0
          %2 = OpTypeVoid
          %3 = OpTypeFunction %2
          %6 = OpTypeFloat 32
          %7 = OpTypeVector %6 4
         %11 = OpTypeVector %6 2
         %12 = OpTypeStruct %11
         %13 = OpTypePointer Uniform %12
         %14 = OpVariable %13 Uniform
         %15 = OpTypeInt 32 1
         %16 = OpConstant %15 0
         %17 = OpTypeInt 32 0
         %18 = OpConstant %17 0
         %19 = OpTypePointer Uniform %6
         %22 = OpConstant %6 0
         %23 = OpTypeBool
         %28 = OpConstant %6 1
         %29 = OpConstantComposite %7 %28 %22 %22 %28
         %41 = OpConstantTrue %23
         %47 = OpConstant %17 1
         %51 = OpTypePointer Output %7
         %52 = OpVariable %51 Output
         %63 = OpConstantFalse %23
          %4 = OpFunction %2 None %3
          %5 = OpLabel
               OpBranch %60
         %60 = OpLabel
               OpLoopMerge %59 %62 None
               OpBranch %36
         %36 = OpLabel
        %100 = OpPhi %23 %63 %60 %98 %66
               OpLoopMerge %38 %66 None
               OpBranch %42
         %42 = OpLabel
         %48 = OpAccessChain %19 %14 %16 %47
         %49 = OpLoad %6 %48
         %50 = OpFOrdGreaterThan %23 %49 %22
               OpLoopMerge %44 %45 None
               OpBranchConditional %50 %43 %44
         %43 = OpLabel
               OpBranch %81
         %81 = OpLabel
               OpLoopMerge %82 %83 None
               OpBranch %84
         %84 = OpLabel
         %85 = OpAccessChain %19 %14 %16 %18
         %86 = OpLoad %6 %85
         %87 = OpFOrdGreaterThan %23 %86 %22
               OpSelectionMerge %88 None
               OpBranchConditional %87 %89 %88
         %89 = OpLabel
         %90 = OpFunctionCall %2 %55
         %91 = OpUndef %7
               OpBranch %82
         %88 = OpLabel
         %94 = OpCompositeConstruct %7 %86 %86 %86 %86
         %95 = OpFAdd %7 %29 %94
               OpBranch %82
         %83 = OpLabel
               OpBranch %81
         %82 = OpLabel
         %97 = OpPhi %7 %91 %89 %95 %88
               OpStore %52 %97
               OpBranch %44
         %45 = OpLabel
               OpBranch %42
         %44 = OpLabel
         %98 = OpPhi %23 %100 %42 %41 %82
               OpSelectionMerge %101 None
               OpBranchConditional %98 %38 %66
        %101 = OpLabel
               OpBranch %66
         %66 = OpLabel
               OpBranch %36
         %38 = OpLabel
               OpSelectionMerge %68 None
               OpBranchConditional %98 %59 %68
         %68 = OpLabel
               OpBranch %59
         %62 = OpLabel
               OpBranch %60
         %59 = OpLabel
               OpReturn
               OpFunctionEnd
         %55 = OpFunction %2 None %3
         %56 = OpLabel
               OpKill
               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