#!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 OpKill wrapping code path

# The test passes because shader always writes red.

# Optimized using spirv-opt with the following arguments:
# '--vector-dce'
# '--combine-access-chains'
# '--eliminate-local-multi-store'
# '--scalar-replacement=100'
# '--simplify-instructions'
# '--eliminate-dead-branches'
# '--merge-return'
# '--combine-access-chains'
# '--simplify-instructions'
# '--eliminate-dead-branches'
# '--merge-blocks'
# 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 zero;
# };
#
# void func(int x)
# {
#     // Always false.
#     if (x < zero)
#         discard;
#
#     if (x > 8)
#         _GLF_color = vec4(1, 0, 0, 1);
#     else
#         _GLF_color = vec4(0);
# }
#
# void main()
# {
#     _GLF_color = vec4(0);
#
#     for (int i = 0; i < 10 + zero; i++)
#         func(i);
# }
SHADER fragment variant_fragment_shader SPIRV-ASM
; 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 %10 "func(i1;"
               OpName %9 "x"
               OpName %13 "buf0"
               OpMemberName %13 0 "zero"
               OpName %15 ""
               OpName %33 "_GLF_color"
               OpName %39 "i"
               OpName %51 "param"
               OpMemberDecorate %13 0 Offset 0
               OpDecorate %13 Block
               OpDecorate %15 DescriptorSet 0
               OpDecorate %15 Binding 0
               OpDecorate %33 Location 0
          %2 = OpTypeVoid
          %3 = OpTypeFunction %2
          %6 = OpTypeInt 32 1
          %7 = OpTypePointer Function %6
          %8 = OpTypeFunction %2 %7
         %13 = OpTypeStruct %6
         %14 = OpTypePointer Uniform %13
         %15 = OpVariable %14 Uniform
         %16 = OpConstant %6 0
         %17 = OpTypePointer Uniform %6
         %20 = OpTypeBool
         %26 = OpConstant %6 8
         %30 = OpTypeFloat 32
         %31 = OpTypeVector %30 4
         %32 = OpTypePointer Output %31
         %33 = OpVariable %32 Output
         %34 = OpConstant %30 1
         %35 = OpConstant %30 0
         %36 = OpConstantComposite %31 %34 %35 %35 %34
         %38 = OpConstantComposite %31 %35 %35 %35 %35
         %46 = OpConstant %6 10
         %55 = OpConstant %6 1
          %4 = OpFunction %2 None %3
          %5 = OpLabel
         %39 = OpVariable %7 Function
         %51 = OpVariable %7 Function
               OpStore %33 %38
               OpStore %39 %16
               OpBranch %40
         %40 = OpLabel
         %57 = OpPhi %6 %16 %5 %56 %41
         %47 = OpAccessChain %17 %15 %16
         %48 = OpLoad %6 %47
         %49 = OpIAdd %6 %46 %48
         %50 = OpSLessThan %20 %57 %49
               OpLoopMerge %42 %41 None
               OpBranchConditional %50 %41 %42
         %41 = OpLabel
               OpStore %51 %57
         %53 = OpFunctionCall %2 %10 %51
         %56 = OpIAdd %6 %57 %55
               OpStore %39 %56
               OpBranch %40
         %42 = OpLabel
               OpReturn
               OpFunctionEnd
         %10 = OpFunction %2 None %8
          %9 = OpFunctionParameter %7
         %11 = OpLabel
         %12 = OpLoad %6 %9
         %18 = OpAccessChain %17 %15 %16
         %19 = OpLoad %6 %18
         %21 = OpSLessThan %20 %12 %19
               OpSelectionMerge %23 None
               OpBranchConditional %21 %22 %23
         %22 = OpLabel
               OpKill
         %23 = OpLabel
         %25 = OpLoad %6 %9
         %27 = OpSGreaterThan %20 %25 %26
               OpSelectionMerge %29 None
               OpBranchConditional %27 %28 %37
         %28 = OpLabel
               OpStore %33 %36
               OpBranch %29
         %37 = OpLabel
               OpStore %33 %38
               OpBranch %29
         %29 = OpLabel
               OpReturn
               OpFunctionEnd
END

# uniforms for variant

# 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_zero 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