#!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 instruction folding 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;
#
# layout(location = 0) out vec4 _GLF_color;
# layout(set = 0, binding = 0) uniform buf0
# {
#     float one;
# };
#
# void main()
# {
#     // This selects the second vector because one == 1.
#     vec3 v = mix(vec3(5, 8, -12.2), vec3(1, 4.9, -2.1), one);
#
#     float d = distance(v, vec3(1, 4.9, -2.1));
#
#     if (d < 0.1)
#         _GLF_color = vec4(v.x, 0, 0, 1);
#     else
#         _GLF_color = vec4(0);
# }
SHADER fragment variant_fragment_shader SPIRV-ASM
; SPIR-V
; Version: 1.0
; Generator: Khronos Glslang Reference Front End; 8
; Bound: 49
; Schema: 0
               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %4 "main" %40
               OpExecutionMode %4 OriginUpperLeft
               OpSource ESSL 310
               OpName %4 "main"
               OpName %9 "v"
               OpName %18 "buf0"
               OpMemberName %18 0 "one"
               OpName %20 ""
               OpName %29 "d"
               OpName %40 "_GLF_color"
               OpMemberDecorate %18 0 Offset 0
               OpDecorate %18 Block
               OpDecorate %20 DescriptorSet 0
               OpDecorate %20 Binding 0
               OpDecorate %40 Location 0
          %2 = OpTypeVoid
          %3 = OpTypeFunction %2
          %6 = OpTypeFloat 32
          %7 = OpTypeVector %6 3
          %8 = OpTypePointer Function %7
         %10 = OpConstant %6 5
         %11 = OpConstant %6 8
         %12 = OpConstant %6 -12.1999998
         %13 = OpConstantComposite %7 %10 %11 %12
         %14 = OpConstant %6 1
         %15 = OpConstant %6 4.9000001
         %16 = OpConstant %6 -2.0999999
         %17 = OpConstantComposite %7 %14 %15 %16
         %18 = OpTypeStruct %6
         %19 = OpTypePointer Uniform %18
         %20 = OpVariable %19 Uniform
         %21 = OpTypeInt 32 1
         %22 = OpConstant %21 0
         %23 = OpTypePointer Uniform %6
         %28 = OpTypePointer Function %6
         %33 = OpConstant %6 0.100000001
         %34 = OpTypeBool
         %38 = OpTypeVector %6 4
         %39 = OpTypePointer Output %38
         %40 = OpVariable %39 Output
         %41 = OpTypeInt 32 0
         %42 = OpConstant %41 0
         %45 = OpConstant %6 0
         %48 = OpConstantComposite %38 %45 %45 %45 %45
          %4 = OpFunction %2 None %3
          %5 = OpLabel
          %9 = OpVariable %8 Function
         %29 = OpVariable %28 Function
         %24 = OpAccessChain %23 %20 %22
         %25 = OpLoad %6 %24
         %26 = OpCompositeConstruct %7 %25 %25 %25
         %27 = OpExtInst %7 %1 FMix %13 %17 %26
               OpStore %9 %27
         %30 = OpLoad %7 %9
         %31 = OpExtInst %6 %1 Distance %30 %17
               OpStore %29 %31
         %32 = OpLoad %6 %29
         %35 = OpFOrdLessThan %34 %32 %33
               OpSelectionMerge %37 None
               OpBranchConditional %35 %36 %47
         %36 = OpLabel
         %43 = OpAccessChain %28 %9 %42
         %44 = OpLoad %6 %43
         %46 = OpCompositeConstruct %38 %44 %45 %45 %14
               OpStore %40 %46
               OpBranch %37
         %47 = OpLabel
               OpStore %40 %48
               OpBranch %37
         %37 = OpLabel
               OpReturn
               OpFunctionEnd
END

# uniforms for variant

# one
BUFFER variant_one DATA_TYPE float DATA
 1.0
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
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