#!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 an always false while function

# The test passes because the shader always writes the color red (while function in the shader is always false)

# Optimized using spirv-opt with the following arguments:
# '--redundancy-elimination'
# '--reduce-load-size'
# '--eliminate-dead-branches'
# '--merge-blocks'
# '--vector-dce'
# '--eliminate-dead-branches'
# spirv-opt commit hash: 230c9e437146e48ec58adb4433890403c23c98fa


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 main()
# {
#   _GLF_color = vec4(1.0, 0.0, 0.0, 1.0);
#  do
#   {
#    for(
#        int j = int(injectionSwitch.x);
#        j < 2;
#        ++j
#    )
#     {
#      return;
#     }
#   }
#  while(0.0 > injectionSwitch.y);
#  int(injectionSwitch.y);
# }
SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0
; SPIR-V
; Version: 1.0
; Generator: Khronos Glslang Reference Front End; 7
; Bound: 52
; Schema: 0
               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %4 "main" %9
               OpExecutionMode %4 OriginUpperLeft
               OpSource ESSL 310
               OpName %4 "main"
               OpName %9 "_GLF_color"
               OpName %19 "j"
               OpName %21 "buf0"
               OpMemberName %21 0 "injectionSwitch"
               OpName %23 ""
               OpDecorate %9 Location 0
               OpDecorate %19 RelaxedPrecision
               OpMemberDecorate %21 0 Offset 0
               OpDecorate %21 Block
               OpDecorate %23 DescriptorSet 0
               OpDecorate %23 Binding 0
               OpDecorate %30 RelaxedPrecision
               OpDecorate %36 RelaxedPrecision
          %2 = OpTypeVoid
          %3 = OpTypeFunction %2
          %6 = OpTypeFloat 32
          %7 = OpTypeVector %6 4
          %8 = OpTypePointer Output %7
          %9 = OpVariable %8 Output
         %10 = OpConstant %6 1
         %11 = OpConstant %6 0
         %12 = OpConstantComposite %7 %10 %11 %11 %10
         %17 = OpTypeInt 32 1
         %18 = OpTypePointer Function %17
         %20 = OpTypeVector %6 2
         %21 = OpTypeStruct %20
         %22 = OpTypePointer Uniform %21
         %23 = OpVariable %22 Uniform
         %24 = OpConstant %17 0
         %25 = OpTypeInt 32 0
         %26 = OpConstant %25 0
         %27 = OpTypePointer Uniform %6
         %37 = OpConstant %17 2
         %38 = OpTypeBool
         %42 = OpConstant %17 1
         %44 = OpConstant %25 1
          %4 = OpFunction %2 None %3
          %5 = OpLabel
         %19 = OpVariable %18 Function
               OpStore %9 %12
               OpBranch %13
         %13 = OpLabel
         %28 = OpAccessChain %27 %23 %24 %26
         %29 = OpLoad %6 %28
         %30 = OpConvertFToS %17 %29
               OpStore %19 %30
               OpLoopMerge %15 %33 None
               OpBranch %31
         %31 = OpLabel
         %36 = OpLoad %17 %19
         %39 = OpSLessThan %38 %36 %37
               OpLoopMerge %51 %34 None
               OpBranchConditional %39 %32 %51
         %32 = OpLabel
               OpReturn
         %34 = OpLabel
               OpBranch %31
         %51 = OpLabel
               OpBranch %33
         %33 = OpLabel
         %45 = OpAccessChain %27 %23 %24 %44
         %46 = OpLoad %6 %45
         %47 = OpFOrdGreaterThan %38 %11 %46
               OpBranchConditional %47 %13 %15
         %15 = OpLabel
         %50 = OpConvertFToS %17 %46
               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