#!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 store elimination path.

# The test passes because shader always writes red.

# Optimized using spirv-opt with the following arguments:
# '--if-conversion'
# '--eliminate-local-single-block'
# '--redundancy-elimination'
# '--reduce-load-size'
# spirv-opt commit hash: 9215c1b7df0029f27807e8c8d7ec80532ce90a87


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
# {
#     int one;
# };
#
# void main()
# {
#     ivec2 v0 = ivec2(0);
#     ivec2 v1 = ivec2(2);
#     int a = one;
#
#     do
#     {
#         // Always false.
#         if (a > 10)
#         {
#             _GLF_color = vec4(0);
#             return;
#         }
#
#         v0 = v1.x > a ? ivec2(0) : ivec2(1);
#         a++;
#     } while(a < 9);
#
#     // After the loop v0 == (1, 1).
#
#     if(v1.x > 1)
#         v0 += ivec2(1);
#
#     if (v0 == ivec2(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: 71
; Schema: 0
               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %4 "main" %36
               OpExecutionMode %4 OriginUpperLeft
               OpSource ESSL 310
               OpName %4 "main"
               OpName %9 "v0"
               OpName %12 "v1"
               OpName %16 "a"
               OpName %17 "buf0"
               OpMemberName %17 0 "one"
               OpName %19 ""
               OpName %36 "_GLF_color"
               OpMemberDecorate %17 0 Offset 0
               OpDecorate %17 Block
               OpDecorate %19 DescriptorSet 0
               OpDecorate %19 Binding 0
               OpDecorate %36 Location 0
          %2 = OpTypeVoid
          %3 = OpTypeFunction %2
          %6 = OpTypeInt 32 1
          %7 = OpTypeVector %6 2
          %8 = OpTypePointer Function %7
         %10 = OpConstant %6 0
         %11 = OpConstantComposite %7 %10 %10
         %13 = OpConstant %6 2
         %14 = OpConstantComposite %7 %13 %13
         %15 = OpTypePointer Function %6
         %17 = OpTypeStruct %6
         %18 = OpTypePointer Uniform %17
         %19 = OpVariable %18 Uniform
         %20 = OpTypePointer Uniform %6
         %28 = OpConstant %6 10
         %29 = OpTypeBool
         %33 = OpTypeFloat 32
         %34 = OpTypeVector %33 4
         %35 = OpTypePointer Output %34
         %36 = OpVariable %35 Output
         %37 = OpConstant %33 0
         %38 = OpConstantComposite %34 %37 %37 %37 %37
         %40 = OpTypeInt 32 0
         %41 = OpConstant %40 0
         %46 = OpConstant %6 1
         %47 = OpConstantComposite %7 %46 %46
         %48 = OpTypeVector %29 2
         %54 = OpConstant %6 9
         %68 = OpConstant %33 1
         %69 = OpConstantComposite %34 %68 %37 %37 %68
          %4 = OpFunction %2 None %3
          %5 = OpLabel
          %9 = OpVariable %8 Function
         %12 = OpVariable %8 Function
         %16 = OpVariable %15 Function
               OpStore %9 %11
               OpStore %12 %14
         %21 = OpAccessChain %20 %19 %10
         %22 = OpLoad %6 %21
               OpStore %16 %22
               OpBranch %23
         %23 = OpLabel
               OpLoopMerge %25 %26 None
               OpBranch %24
         %24 = OpLabel
         %27 = OpLoad %6 %16
         %30 = OpSGreaterThan %29 %27 %28
               OpSelectionMerge %32 None
               OpBranchConditional %30 %31 %32
         %31 = OpLabel
               OpStore %36 %38
               OpReturn
         %32 = OpLabel
         %42 = OpAccessChain %15 %12 %41
         %43 = OpLoad %6 %42
         %44 = OpLoad %6 %16
         %45 = OpSGreaterThan %29 %43 %44
         %49 = OpCompositeConstruct %48 %45 %45
         %50 = OpSelect %7 %49 %11 %47
               OpStore %9 %50
         %52 = OpIAdd %6 %44 %46
               OpStore %16 %52
               OpBranch %26
         %26 = OpLabel
         %53 = OpLoad %6 %16
         %55 = OpSLessThan %29 %53 %54
               OpBranchConditional %55 %23 %25
         %25 = OpLabel
         %57 = OpLoad %6 %42
         %58 = OpSGreaterThan %29 %57 %46
               OpSelectionMerge %60 None
               OpBranchConditional %58 %59 %60
         %59 = OpLabel
         %61 = OpLoad %7 %9
         %62 = OpIAdd %7 %61 %47
               OpStore %9 %62
               OpBranch %60
         %60 = OpLabel
         %63 = OpLoad %7 %9
         %64 = OpIEqual %48 %63 %14
         %65 = OpAll %29 %64
               OpSelectionMerge %67 None
               OpBranchConditional %65 %66 %70
         %66 = OpLabel
               OpStore %36 %69
               OpBranch %67
         %70 = OpLabel
               OpStore %36 %38
               OpBranch %67
         %67 = OpLabel
               OpReturn
               OpFunctionEnd
END

# uniforms for variant

# one
BUFFER variant_one DATA_TYPE int32 DATA
 1
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_one 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