#!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 code simplification 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;
# precision highp int;
#
# layout(location = 0) out vec4 _GLF_color;
# layout(set = 0, binding = 0) uniform buf0
# {
#     int one;
# };
# layout(set = 0, binding = 1) uniform buf1
# {
#     int zero;
# };
#
# void main()
# {
#     _GLF_color = vec4(0);
#
#     for(int i = 0; i < one; i++)
#     {
#         do
#         {
#             // Always true.
#             if(one == 1)
#                 _GLF_color = vec4(1, 0, 0, 1);
#         }
#         while(false);
#     }
#
#     vec4 v;
#     v.y = float(zero);
#     _GLF_color.y = v.y;
# }
SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0
; SPIR-V
; Version: 1.0
; Generator: Khronos Glslang Reference Front End; 8
; Bound: 61
; 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 %14 "i"
               OpName %22 "buf0"
               OpMemberName %22 0 "one"
               OpName %24 ""
               OpName %46 "v"
               OpName %47 "buf1"
               OpMemberName %47 0 "zero"
               OpName %49 ""
               OpDecorate %9 Location 0
               OpMemberDecorate %22 0 Offset 0
               OpDecorate %22 Block
               OpDecorate %24 DescriptorSet 0
               OpDecorate %24 Binding 0
               OpMemberDecorate %47 0 Offset 0
               OpDecorate %47 Block
               OpDecorate %49 DescriptorSet 0
               OpDecorate %49 Binding 1
          %2 = OpTypeVoid
          %3 = OpTypeFunction %2
          %6 = OpTypeFloat 32
          %7 = OpTypeVector %6 4
          %8 = OpTypePointer Output %7
          %9 = OpVariable %8 Output
         %10 = OpConstant %6 0
         %11 = OpConstantComposite %7 %10 %10 %10 %10
         %12 = OpTypeInt 32 1
         %13 = OpTypePointer Function %12
         %15 = OpConstant %12 0
         %22 = OpTypeStruct %12
         %23 = OpTypePointer Uniform %22
         %24 = OpVariable %23 Uniform
         %25 = OpTypePointer Uniform %12
         %28 = OpTypeBool
         %36 = OpConstant %12 1
         %40 = OpConstant %6 1
         %41 = OpConstantComposite %7 %40 %10 %10 %40
         %42 = OpConstantFalse %28
         %45 = OpTypePointer Function %7
         %47 = OpTypeStruct %12
         %48 = OpTypePointer Uniform %47
         %49 = OpVariable %48 Uniform
         %53 = OpTypeInt 32 0
         %54 = OpConstant %53 1
         %55 = OpTypePointer Function %6
         %59 = OpTypePointer Output %6
          %4 = OpFunction %2 None %3
          %5 = OpLabel
         %14 = OpVariable %13 Function
         %46 = OpVariable %45 Function
               OpStore %9 %11
               OpStore %14 %15
               OpBranch %16
         %16 = OpLabel
               OpLoopMerge %18 %19 None
               OpBranch %20
         %20 = OpLabel
         %21 = OpLoad %12 %14
         %26 = OpAccessChain %25 %24 %15
         %27 = OpLoad %12 %26
         %29 = OpSLessThan %28 %21 %27
               OpBranchConditional %29 %17 %18
         %17 = OpLabel
               OpBranch %30
         %30 = OpLabel
               OpLoopMerge %32 %33 None
               OpBranch %31
         %31 = OpLabel
         %34 = OpAccessChain %25 %24 %15
         %35 = OpLoad %12 %34
         %37 = OpIEqual %28 %35 %36
               OpSelectionMerge %39 None
               OpBranchConditional %37 %38 %39
         %38 = OpLabel
               OpStore %9 %41
               OpBranch %39
         %39 = OpLabel
               OpBranch %33
         %33 = OpLabel
               OpBranchConditional %42 %30 %32
         %32 = OpLabel
               OpBranch %19
         %19 = OpLabel
         %43 = OpLoad %12 %14
         %44 = OpIAdd %12 %43 %36
               OpStore %14 %44
               OpBranch %16
         %18 = OpLabel
         %50 = OpAccessChain %25 %49 %15
         %51 = OpLoad %12 %50
         %52 = OpConvertSToF %6 %51
         %56 = OpAccessChain %55 %46 %54
               OpStore %56 %52
         %57 = OpAccessChain %55 %46 %54
         %58 = OpLoad %6 %57
         %60 = OpAccessChain %59 %9 %54
               OpStore %60 %58
               OpReturn
               OpFunctionEnd
END

# uniforms for variant

# one
BUFFER variant_one DATA_TYPE int32 DATA
 1
END
# zero
BUFFER variant_zero DATA_TYPE int32 DATA
 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_one AS uniform DESCRIPTOR_SET 0 BINDING 0
  BIND BUFFER variant_zero AS uniform DESCRIPTOR_SET 0 BINDING 1
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