#!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 the GraphicsFuzz project.

# Short description: A fragment shader that covers specific constant fold and selection dag code paths

# The test passes because the shader always writes red.

SHADER vertex variant_vertex_shader PASSTHROUGH

# variant_fragment_shader is derived from the following GLSL:
# #version 310 es
# #define _float_1_0 _GLF_uniform_float_values[0]
# #define _float_0_0 _GLF_uniform_float_values[1]
#
# precision highp float;
#
# // Contents of _GLF_uniform_float_values: [1.0, 0.0]
# layout(set = 0, binding = 0) uniform buf0
# {
#     float _GLF_uniform_float_values[2];
# };
#
# layout(location = 0) out vec4 _GLF_color;
#
# void main()
# {
#     float a = -1.0;
#     float b = 1.7;
#
#     // c becomes undefined since a < 0. This results in an undefined value, but not in undefined behavior.
#     float c = pow(a, b);
#
#     _GLF_color = vec4(c);
#
#     if (a == -1.0 && b == 1.7)
#     {
#         _GLF_color = vec4(_float_1_0, _float_0_0, _float_0_0, _float_1_0);
#     }
#     else
#     {
#         _GLF_color = vec4(_float_1_0);
#     }
# }
SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0
; SPIR-V
; Version: 1.0
; Generator: Khronos Glslang Reference Front End; 10
; Bound: 52
; Schema: 0
               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %4 "main" %18
               OpExecutionMode %4 OriginUpperLeft
               OpSource ESSL 310
               OpName %4 "main"
               OpName %8 "a"
               OpName %10 "b"
               OpName %12 "c"
               OpName %18 "_GLF_color"
               OpName %32 "buf0"
               OpMemberName %32 0 "_GLF_uniform_float_values"
               OpName %34 ""
               OpDecorate %18 Location 0
               OpDecorate %31 ArrayStride 16
               OpMemberDecorate %32 0 Offset 0
               OpDecorate %32 Block
               OpDecorate %34 DescriptorSet 0
               OpDecorate %34 Binding 0
          %2 = OpTypeVoid
          %3 = OpTypeFunction %2
          %6 = OpTypeFloat 32
          %7 = OpTypePointer Function %6
          %9 = OpConstant %6 -1
         %11 = OpConstant %6 1.70000005
         %16 = OpTypeVector %6 4
         %17 = OpTypePointer Output %16
         %18 = OpVariable %17 Output
         %22 = OpTypeBool
         %29 = OpTypeInt 32 0
         %30 = OpConstant %29 2
         %31 = OpTypeArray %6 %30
         %32 = OpTypeStruct %31
         %33 = OpTypePointer Uniform %32
         %34 = OpVariable %33 Uniform
         %35 = OpTypeInt 32 1
         %36 = OpConstant %35 0
         %37 = OpTypePointer Uniform %6
         %40 = OpConstant %35 1
          %4 = OpFunction %2 None %3
          %5 = OpLabel
          %8 = OpVariable %7 Function
         %10 = OpVariable %7 Function
         %12 = OpVariable %7 Function
               OpStore %8 %9
               OpStore %10 %11
         %13 = OpLoad %6 %8
         %14 = OpLoad %6 %10
         %15 = OpExtInst %6 %1 Pow %13 %14
               OpStore %12 %15
         %19 = OpLoad %6 %12
         %20 = OpCompositeConstruct %16 %19 %19 %19 %19
               OpStore %18 %20
         %21 = OpLoad %6 %8
         %23 = OpFOrdEqual %22 %21 %9
         %24 = OpLoad %6 %10
         %25 = OpFOrdEqual %22 %24 %11
         %26 = OpLogicalAnd %22 %23 %25
               OpSelectionMerge %28 None
               OpBranchConditional %26 %27 %48
         %27 = OpLabel
         %38 = OpAccessChain %37 %34 %36 %36
         %39 = OpLoad %6 %38
         %41 = OpAccessChain %37 %34 %36 %40
         %42 = OpLoad %6 %41
         %43 = OpAccessChain %37 %34 %36 %40
         %44 = OpLoad %6 %43
         %45 = OpAccessChain %37 %34 %36 %36
         %46 = OpLoad %6 %45
         %47 = OpCompositeConstruct %16 %39 %42 %44 %46
               OpStore %18 %47
               OpBranch %28
         %48 = OpLabel
         %49 = OpAccessChain %37 %34 %36 %36
         %50 = OpLoad %6 %49
         %51 = OpCompositeConstruct %16 %50 %50 %50 %50
               OpStore %18 %51
               OpBranch %28
         %28 = OpLabel
               OpReturn
               OpFunctionEnd
END

# uniforms for variant

# _GLF_uniform_float_values
BUFFER variant__GLF_uniform_float_values DATA_TYPE float[] STD140 DATA
 1.0 0.0
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__GLF_uniform_float_values 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