#!amber

# Copyright 2020 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 that has nested if condition in do while

# The test passes because shader always writes red.

# Optimized using spirv-opt with the following arguments:
# '--eliminate-dead-code-aggressive'
# '--copy-propagate-arrays'
# '--copy-propagate-arrays'
# '--vector-dce'
# '--redundancy-elimination'
# '--eliminate-local-single-block'
# '--redundancy-elimination'
# '--eliminate-dead-branches'
# '--merge-return'
# '--eliminate-dead-branches'
# '--merge-return'
# '--combine-access-chains'
# '--redundancy-elimination'
# '--private-to-local'
# '--simplify-instructions'
# '--ccp'
# '--eliminate-local-multi-store'
# '--inline-entry-points-exhaustive'
# '--if-conversion'
# '--eliminate-dead-inserts'
# spirv-opt commit hash: ab7ac60f14ae66006bed5c989a2cfd4c4881704c


SHADER vertex variant_vertex_shader PASSTHROUGH

# variant_fragment_shader is derived from the following GLSL:
# #version 310 es
# precision highp float;
# precision highp int;
#
# layout(location = 0) out vec4 _GLF_color;
#
# float one()
# {
#     return 1.0;
# }
#
# void main()
# {
#     vec2 v = vec2(0);
#     bool alwaysFalse = gl_FragCoord.x < -1.0;
#
#     do
#     {
#         if (v.x < 2.0) // Always true
#         {
#             if (!alwaysFalse)
#                 v[int(one())] = 1.0;
#         }
#     } while (alwaysFalse);
#
#     if (v[0] == 0.0 && v[1] == 1.0)
#         _GLF_color = vec4(1, 0, 0, 1);
#     else
#         _GLF_color = vec4(0);
# }
SHADER fragment variant_fragment_shader SPIRV-ASM
; SPIR-V
; Version: 1.0
; Generator: Khronos Glslang Reference Front End; 8
; Bound: 72
; 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 %8 "one("
               OpName %15 "v"
               OpName %20 "alwaysFalse"
               OpName %23 "gl_FragCoord"
               OpName %64 "_GLF_color"
               OpDecorate %23 BuiltIn FragCoord
               OpDecorate %64 Location 0
          %2 = OpTypeVoid
          %3 = OpTypeFunction %2
          %6 = OpTypeFloat 32
          %7 = OpTypeFunction %6
         %10 = OpConstant %6 1
         %13 = OpTypeVector %6 2
         %14 = OpTypePointer Function %13
         %16 = OpConstant %6 0
         %17 = OpConstantComposite %13 %16 %16
         %18 = OpTypeBool
         %19 = OpTypePointer Function %18
         %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 -1
         %35 = OpTypePointer Function %6
         %38 = OpConstant %6 2
         %47 = OpTypeInt 32 1
         %56 = OpConstant %24 1
         %63 = OpTypePointer Output %21
         %64 = OpVariable %63 Output
         %65 = OpConstantComposite %21 %10 %16 %16 %10
         %67 = OpConstantComposite %21 %16 %16 %16 %16
          %4 = OpFunction %2 None %3
          %5 = OpLabel
         %71 = OpVariable %35 Function
         %15 = OpVariable %14 Function
         %20 = OpVariable %19 Function
               OpStore %15 %17
         %27 = OpAccessChain %26 %23 %25
         %28 = OpLoad %6 %27
         %30 = OpFOrdLessThan %18 %28 %29
               OpStore %20 %30
               OpBranch %31
         %31 = OpLabel
               OpLoopMerge %33 %34 None
               OpBranch %32
         %32 = OpLabel
         %36 = OpAccessChain %35 %15 %25
         %37 = OpLoad %6 %36
         %39 = OpFOrdLessThan %18 %37 %38
               OpSelectionMerge %41 None
               OpBranchConditional %39 %40 %41
         %40 = OpLabel
         %43 = OpLogicalNot %18 %30
               OpSelectionMerge %45 None
               OpBranchConditional %43 %44 %45
         %44 = OpLabel
               OpStore %71 %10
         %46 = OpLoad %6 %71
         %48 = OpConvertFToS %47 %46
         %49 = OpAccessChain %35 %15 %48
               OpStore %49 %10
               OpBranch %45
         %45 = OpLabel
               OpBranch %41
         %41 = OpLabel
               OpBranch %34
         %34 = OpLabel
               OpBranchConditional %30 %31 %33
         %33 = OpLabel
         %52 = OpLoad %6 %36
         %53 = OpFOrdEqual %18 %52 %16
               OpSelectionMerge %55 None
               OpBranchConditional %53 %54 %55
         %54 = OpLabel
         %57 = OpAccessChain %35 %15 %56
         %58 = OpLoad %6 %57
         %59 = OpFOrdEqual %18 %58 %10
               OpBranch %55
         %55 = OpLabel
         %60 = OpPhi %18 %53 %33 %59 %54
               OpSelectionMerge %62 None
               OpBranchConditional %60 %61 %66
         %61 = OpLabel
               OpStore %64 %65
               OpBranch %62
         %66 = OpLabel
               OpStore %64 %67
               OpBranch %62
         %62 = OpLabel
               OpReturn
               OpFunctionEnd
          %8 = OpFunction %6 None %7
          %9 = OpLabel
               OpReturnValue %10
               OpFunctionEnd
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
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