#!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 uniform value as a return

# The test passes because shader always writes color red

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;
#
# layout(set = 0, binding = 0) uniform buf0
# {
#   vec2 injectionSwitch;
# };
#
# float fx(){
#   if (gl_FragCoord.y >= 0.0)
#     return injectionSwitch.y;
#
#   while(true){
#     _GLF_color = vec4(1.0, 1.0, 1.0, 1.0);
#   };
# }
#
# void main()
# {
#   float x2 = 1.0;
#   float B = 1.0;
#
#   _GLF_color = vec4(fx(), 0.0, 0.0, 1.0);
#
#   while (x2 > 2.0){
#     float k0;
#     k0 = fx() - fx();
#     B = k0;
#     x2 = B;
#   }
# }
SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0
; SPIR-V
; Version: 1.0
; Generator: Khronos Glslang Reference Front End; 8
; Bound: 63
; Schema: 0
               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %4 "main" %12 %40
               OpExecutionMode %4 OriginUpperLeft
               OpSource ESSL 310
               OpName %4 "main"
               OpName %8 "fx("
               OpName %12 "gl_FragCoord"
               OpName %24 "buf0"
               OpMemberName %24 0 "injectionSwitch"
               OpName %26 ""
               OpName %40 "_GLF_color"
               OpName %45 "x2"
               OpName %46 "B"
               OpName %57 "k0"
               OpDecorate %12 BuiltIn FragCoord
               OpMemberDecorate %24 0 Offset 0
               OpDecorate %24 Block
               OpDecorate %26 DescriptorSet 0
               OpDecorate %26 Binding 0
               OpDecorate %40 Location 0
          %2 = OpTypeVoid
          %3 = OpTypeFunction %2
          %6 = OpTypeFloat 32
          %7 = OpTypeFunction %6
         %10 = OpTypeVector %6 4
         %11 = OpTypePointer Input %10
         %12 = OpVariable %11 Input
         %13 = OpTypeInt 32 0
         %14 = OpConstant %13 1
         %15 = OpTypePointer Input %6
         %18 = OpConstant %6 0
         %19 = OpTypeBool
         %23 = OpTypeVector %6 2
         %24 = OpTypeStruct %23
         %25 = OpTypePointer Uniform %24
         %26 = OpVariable %25 Uniform
         %27 = OpTypeInt 32 1
         %28 = OpConstant %27 0
         %29 = OpTypePointer Uniform %6
         %38 = OpConstantTrue %19
         %39 = OpTypePointer Output %10
         %40 = OpVariable %39 Output
         %41 = OpConstant %6 1
         %42 = OpConstantComposite %10 %41 %41 %41 %41
         %44 = OpTypePointer Function %6
         %55 = OpConstant %6 2
          %4 = OpFunction %2 None %3
          %5 = OpLabel
         %45 = OpVariable %44 Function
         %46 = OpVariable %44 Function
         %57 = OpVariable %44 Function
               OpStore %45 %41
               OpStore %46 %41
         %47 = OpFunctionCall %6 %8
         %48 = OpCompositeConstruct %10 %47 %18 %18 %41
               OpStore %40 %48
               OpBranch %49
         %49 = OpLabel
               OpLoopMerge %51 %52 None
               OpBranch %53
         %53 = OpLabel
         %54 = OpLoad %6 %45
         %56 = OpFOrdGreaterThan %19 %54 %55
               OpBranchConditional %56 %50 %51
         %50 = OpLabel
         %58 = OpFunctionCall %6 %8
         %59 = OpFunctionCall %6 %8
         %60 = OpFSub %6 %58 %59
               OpStore %57 %60
         %61 = OpLoad %6 %57
               OpStore %46 %61
         %62 = OpLoad %6 %46
               OpStore %45 %62
               OpBranch %52
         %52 = OpLabel
               OpBranch %49
         %51 = OpLabel
               OpReturn
               OpFunctionEnd
          %8 = OpFunction %6 None %7
          %9 = OpLabel
         %16 = OpAccessChain %15 %12 %14
         %17 = OpLoad %6 %16
         %20 = OpFOrdGreaterThanEqual %19 %17 %18
               OpSelectionMerge %22 None
               OpBranchConditional %20 %21 %22
         %21 = OpLabel
         %30 = OpAccessChain %29 %26 %28 %14
         %31 = OpLoad %6 %30
               OpReturnValue %31
         %22 = OpLabel
               OpBranch %33
         %33 = OpLabel
               OpLoopMerge %35 %36 None
               OpBranch %37
         %37 = OpLabel
               OpBranchConditional %38 %34 %35
         %34 = OpLabel
               OpStore %40 %42
               OpBranch %36
         %36 = OpLabel
               OpBranch %33
         %35 = OpLabel
         %43 = OpUndef %6
               OpReturnValue %43
               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