#!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 shader with a discard nested in a loop in a function

# The test passes because the discard is always reached, so we end up with the background color, black.

# Optimized using spirv-opt with the following arguments:
# '--simplify-instructions'
# '--eliminate-dead-inserts'
# '--redundancy-elimination'
# '--inline-entry-points-exhaustive'
# '--eliminate-dead-branches'
# '--merge-blocks'
# '--convert-local-access-chains'
# '--convert-local-access-chains'
# '--eliminate-dead-code-aggressive'
# '--eliminate-local-single-store'
# '--if-conversion'
# '--simplify-instructions'
# 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;
# };
# void f()
# {
#  do
#   {
#    if(1.0 > injectionSwitch.y)
#     {
#      if(gl_FragCoord.y < 0.0)
#       {
#       }
#      continue;
#     }
#    discard;
#   }
#  while(false);
# }
# void main()
# {
#  f();
#  _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: 47
; Schema: 0
               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %4 "main" %31 %44
               OpExecutionMode %4 OriginUpperLeft
               OpSource ESSL 310
               OpName %4 "main"
               OpName %6 "f("
               OpName %15 "buf0"
               OpMemberName %15 0 "injectionSwitch"
               OpName %17 ""
               OpName %31 "gl_FragCoord"
               OpName %44 "_GLF_color"
               OpMemberDecorate %15 0 Offset 0
               OpDecorate %15 Block
               OpDecorate %17 DescriptorSet 0
               OpDecorate %17 Binding 0
               OpDecorate %31 BuiltIn FragCoord
               OpDecorate %44 Location 0
          %2 = OpTypeVoid
          %3 = OpTypeFunction %2
         %12 = OpTypeFloat 32
         %13 = OpConstant %12 1
         %14 = OpTypeVector %12 2
         %15 = OpTypeStruct %14
         %16 = OpTypePointer Uniform %15
         %17 = OpVariable %16 Uniform
         %18 = OpTypeInt 32 1
         %19 = OpConstant %18 0
         %20 = OpTypeInt 32 0
         %21 = OpConstant %20 1
         %22 = OpTypePointer Uniform %12
         %25 = OpTypeBool
         %29 = OpTypeVector %12 4
         %30 = OpTypePointer Input %29
         %31 = OpVariable %30 Input
         %32 = OpTypePointer Input %12
         %35 = OpConstant %12 0
         %41 = OpConstantFalse %25
         %43 = OpTypePointer Output %29
         %44 = OpVariable %43 Output
         %45 = OpConstantComposite %29 %13 %35 %35 %13
          %4 = OpFunction %2 None %3
          %5 = OpLabel
         %42 = OpFunctionCall %2 %6
               OpStore %44 %45
               OpReturn
               OpFunctionEnd
          %6 = OpFunction %2 None %3
          %7 = OpLabel
               OpBranch %8
          %8 = OpLabel
               OpLoopMerge %10 %38 None
               OpBranch %9
          %9 = OpLabel
         %23 = OpAccessChain %22 %17 %19 %21
         %24 = OpLoad %12 %23
         %26 = OpFOrdGreaterThan %25 %13 %24
               OpSelectionMerge %28 None
               OpBranchConditional %26 %27 %28
         %27 = OpLabel
         %33 = OpAccessChain %32 %31 %21
         %34 = OpLoad %12 %33
         %36 = OpFOrdLessThan %25 %34 %35
               OpSelectionMerge %46 None
               OpBranchConditional %36 %37 %38
         %37 = OpLabel
               OpBranch %38
         %46 = OpLabel
               OpBranch %38
         %38 = OpLabel
               OpBranchConditional %41 %8 %10
         %28 = OpLabel
               OpKill
         %10 = OpLabel
               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 0 0 0 255