#!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 SSA rewrite 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;
# };
#
# vec4 func()
# {
#     // Always true.
#     if(one == 1)
#         return vec4(1, 0, 0, 1);
#     else
#         return vec4(0);
# }
#
# void main()
# {
#     _GLF_color = vec4(0);
#     for(int i = 0; i <= one; i++)
#     {
#         switch(i)
#         {
#             case 1:
#                 _GLF_color = func();
#             case 0:
#             default:
#                 _GLF_color.y = 0.0;
#                 break;
#         }
#     }
# }
SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0
; SPIR-V
; Version: 1.0
; Generator: Khronos Glslang Reference Front End; 8
; Bound: 58
; Schema: 0
               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %4 "main" %33
               OpExecutionMode %4 OriginUpperLeft
               OpSource ESSL 310
               OpName %4 "main"
               OpName %9 "func("
               OpName %12 "buf0"
               OpMemberName %12 0 "one"
               OpName %14 ""
               OpName %33 "_GLF_color"
               OpName %35 "i"
               OpMemberDecorate %12 0 Offset 0
               OpDecorate %12 Block
               OpDecorate %14 DescriptorSet 0
               OpDecorate %14 Binding 0
               OpDecorate %33 Location 0
          %2 = OpTypeVoid
          %3 = OpTypeFunction %2
          %6 = OpTypeFloat 32
          %7 = OpTypeVector %6 4
          %8 = OpTypeFunction %7
         %11 = OpTypeInt 32 1
         %12 = OpTypeStruct %11
         %13 = OpTypePointer Uniform %12
         %14 = OpVariable %13 Uniform
         %15 = OpConstant %11 0
         %16 = OpTypePointer Uniform %11
         %19 = OpConstant %11 1
         %20 = OpTypeBool
         %24 = OpConstant %6 1
         %25 = OpConstant %6 0
         %26 = OpConstantComposite %7 %24 %25 %25 %24
         %29 = OpConstantComposite %7 %25 %25 %25 %25
         %32 = OpTypePointer Output %7
         %33 = OpVariable %32 Output
         %34 = OpTypePointer Function %11
         %50 = OpTypeInt 32 0
         %51 = OpConstant %50 1
         %52 = OpTypePointer Output %6
          %4 = OpFunction %2 None %3
          %5 = OpLabel
         %35 = OpVariable %34 Function
               OpStore %33 %29
               OpStore %35 %15
               OpBranch %36
         %36 = OpLabel
               OpLoopMerge %38 %39 None
               OpBranch %40
         %40 = OpLabel
         %41 = OpLoad %11 %35
         %42 = OpAccessChain %16 %14 %15
         %43 = OpLoad %11 %42
         %44 = OpSLessThanEqual %20 %41 %43
               OpBranchConditional %44 %37 %38
         %37 = OpLabel
         %45 = OpLoad %11 %35
               OpSelectionMerge %48 None
               OpSwitch %45 %47 1 %46 0 %47
         %47 = OpLabel
         %53 = OpAccessChain %52 %33 %51
               OpStore %53 %25
               OpBranch %48
         %46 = OpLabel
         %49 = OpFunctionCall %7 %9
               OpStore %33 %49
               OpBranch %47
         %48 = OpLabel
               OpBranch %39
         %39 = OpLabel
         %56 = OpLoad %11 %35
         %57 = OpIAdd %11 %56 %19
               OpStore %35 %57
               OpBranch %36
         %38 = OpLabel
               OpReturn
               OpFunctionEnd
          %9 = OpFunction %7 None %8
         %10 = OpLabel
         %17 = OpAccessChain %16 %14 %15
         %18 = OpLoad %11 %17
         %21 = OpIEqual %20 %18 %19
               OpSelectionMerge %23 None
               OpBranchConditional %21 %22 %28
         %22 = OpLabel
               OpReturnValue %26
         %28 = OpLabel
               OpReturnValue %29
         %23 = OpLabel
               OpUnreachable
               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