#!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 coverage-gap found by GraphicsFuzz.

# Short description: A fragment shader that covers a specific single block elimination path.

# The test passes because shader always writes red.

SHADER vertex variant_vertex_shader PASSTHROUGH

# variant_fragment_shader is derived from the following GLSL:
# #version 310 es
# precision highp float;
#
# layout(set = 0, binding = 0) uniform buf0 {
#     vec2 injectionSwitch;
# };
#
# layout(location = 0) out vec4 _GLF_color;
#
# int g = 0;
#
# void main()
# {
#     while(g < int(injectionSwitch.x + 2.0)) {
#         g++;
#     }
#
#     // g is 2.
#     int a = g;
#
#     // Always false.
#     while(g < int(injectionSwitch.y)) {
#         g++;
#     }
#
#     a = a;
#
#     // Always true.
#     if(a == 2)
#         _GLF_color = vec4(1, 0, 0, 1);
#     else
#         _GLF_color = vec4(0);
# }
SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0
; SPIR-V
; Version: 1.0
; Generator: Khronos Glslang Reference Front End; 8
; Bound: 64
; Schema: 0
               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %4 "main" %58
               OpExecutionMode %4 OriginUpperLeft
               OpSource ESSL 310
               OpName %4 "main"
               OpName %8 "g"
               OpName %18 "buf0"
               OpMemberName %18 0 "injectionSwitch"
               OpName %20 ""
               OpName %35 "a"
               OpName %58 "_GLF_color"
               OpDecorate %8 RelaxedPrecision
               OpDecorate %15 RelaxedPrecision
               OpMemberDecorate %18 0 Offset 0
               OpDecorate %18 Block
               OpDecorate %20 DescriptorSet 0
               OpDecorate %20 Binding 0
               OpDecorate %31 RelaxedPrecision
               OpDecorate %33 RelaxedPrecision
               OpDecorate %35 RelaxedPrecision
               OpDecorate %36 RelaxedPrecision
               OpDecorate %42 RelaxedPrecision
               OpDecorate %48 RelaxedPrecision
               OpDecorate %49 RelaxedPrecision
               OpDecorate %50 RelaxedPrecision
               OpDecorate %51 RelaxedPrecision
               OpDecorate %58 Location 0
          %2 = OpTypeVoid
          %3 = OpTypeFunction %2
          %6 = OpTypeInt 32 1
          %7 = OpTypePointer Private %6
          %8 = OpVariable %7 Private
          %9 = OpConstant %6 0
         %16 = OpTypeFloat 32
         %17 = OpTypeVector %16 2
         %18 = OpTypeStruct %17
         %19 = OpTypePointer Uniform %18
         %20 = OpVariable %19 Uniform
         %21 = OpTypeInt 32 0
         %22 = OpConstant %21 0
         %23 = OpTypePointer Uniform %16
         %26 = OpConstant %16 2
         %29 = OpTypeBool
         %32 = OpConstant %6 1
         %34 = OpTypePointer Function %6
         %43 = OpConstant %21 1
         %52 = OpConstant %6 2
         %56 = OpTypeVector %16 4
         %57 = OpTypePointer Output %56
         %58 = OpVariable %57 Output
         %59 = OpConstant %16 1
         %60 = OpConstant %16 0
         %61 = OpConstantComposite %56 %59 %60 %60 %59
         %63 = OpConstantComposite %56 %60 %60 %60 %60
          %4 = OpFunction %2 None %3
          %5 = OpLabel
         %35 = OpVariable %34 Function
               OpStore %8 %9
               OpBranch %10
         %10 = OpLabel
               OpLoopMerge %12 %13 None
               OpBranch %14
         %14 = OpLabel
         %15 = OpLoad %6 %8
         %24 = OpAccessChain %23 %20 %9 %22
         %25 = OpLoad %16 %24
         %27 = OpFAdd %16 %25 %26
         %28 = OpConvertFToS %6 %27
         %30 = OpSLessThan %29 %15 %28
               OpBranchConditional %30 %11 %12
         %11 = OpLabel
         %31 = OpLoad %6 %8
         %33 = OpIAdd %6 %31 %32
               OpStore %8 %33
               OpBranch %13
         %13 = OpLabel
               OpBranch %10
         %12 = OpLabel
         %36 = OpLoad %6 %8
               OpStore %35 %36
               OpBranch %37
         %37 = OpLabel
               OpLoopMerge %39 %40 None
               OpBranch %41
         %41 = OpLabel
         %42 = OpLoad %6 %8
         %44 = OpAccessChain %23 %20 %9 %43
         %45 = OpLoad %16 %44
         %46 = OpConvertFToS %6 %45
         %47 = OpSLessThan %29 %42 %46
               OpBranchConditional %47 %38 %39
         %38 = OpLabel
         %48 = OpLoad %6 %8
         %49 = OpIAdd %6 %48 %32
               OpStore %8 %49
               OpBranch %40
         %40 = OpLabel
               OpBranch %37
         %39 = OpLabel
         %50 = OpLoad %6 %35
               OpStore %35 %50
         %51 = OpLoad %6 %35
         %53 = OpIEqual %29 %51 %52
               OpSelectionMerge %55 None
               OpBranchConditional %53 %54 %62
         %54 = OpLabel
               OpStore %58 %61
               OpBranch %55
         %62 = OpLabel
               OpStore %58 %63
               OpBranch %55
         %55 = 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 255 0 0 255