#!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 value tracking code path

# 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
# precision highp float;
#
# layout(set = 0, binding = 0) uniform buf0
# {
#     float quarter;
# };
#
# layout(location = 0) out vec4 _GLF_color;
#
# void main()
# {
#     vec4 N = vec4(1, 2, 3, 4);
#     vec4 I = vec4(4.0, 87.59, quarter, 92.51);
#     vec4 Nref = vec4(17.05, -6.1, 4329.3705, 2.7);
#     vec4 v = faceforward(N, I, Nref);
#
#     if (v == vec4(-1, -2, -3, -4))
#         _GLF_color = vec4(1, 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: 56
; Schema: 0
               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %4 "main" %51
               OpExecutionMode %4 OriginUpperLeft
               OpSource ESSL 310
               OpName %4 "main"
               OpName %9 "N"
               OpName %15 "I"
               OpName %17 "buf0"
               OpMemberName %17 0 "quarter"
               OpName %19 ""
               OpName %27 "Nref"
               OpName %33 "v"
               OpName %51 "_GLF_color"
               OpMemberDecorate %17 0 Offset 0
               OpDecorate %17 Block
               OpDecorate %19 DescriptorSet 0
               OpDecorate %19 Binding 0
               OpDecorate %51 Location 0
          %2 = OpTypeVoid
          %3 = OpTypeFunction %2
          %6 = OpTypeFloat 32
          %7 = OpTypeVector %6 4
          %8 = OpTypePointer Function %7
         %10 = OpConstant %6 1
         %11 = OpConstant %6 2
         %12 = OpConstant %6 3
         %13 = OpConstant %6 4
         %14 = OpConstantComposite %7 %10 %11 %12 %13
         %16 = OpConstant %6 87.5899963
         %17 = OpTypeStruct %6
         %18 = OpTypePointer Uniform %17
         %19 = OpVariable %18 Uniform
         %20 = OpTypeInt 32 1
         %21 = OpConstant %20 0
         %22 = OpTypePointer Uniform %6
         %25 = OpConstant %6 92.5100021
         %28 = OpConstant %6 17.0499992
         %29 = OpConstant %6 -6.0999999
         %30 = OpConstant %6 4329.37061
         %31 = OpConstant %6 2.70000005
         %32 = OpConstantComposite %7 %28 %29 %30 %31
         %39 = OpConstant %6 -1
         %40 = OpConstant %6 -2
         %41 = OpConstant %6 -3
         %42 = OpConstant %6 -4
         %43 = OpConstantComposite %7 %39 %40 %41 %42
         %44 = OpTypeBool
         %45 = OpTypeVector %44 4
         %50 = OpTypePointer Output %7
         %51 = OpVariable %50 Output
         %52 = OpConstant %6 0
         %53 = OpConstantComposite %7 %10 %52 %52 %10
         %55 = OpConstantComposite %7 %52 %52 %52 %52
          %4 = OpFunction %2 None %3
          %5 = OpLabel
          %9 = OpVariable %8 Function
         %15 = OpVariable %8 Function
         %27 = OpVariable %8 Function
         %33 = OpVariable %8 Function
               OpStore %9 %14
         %23 = OpAccessChain %22 %19 %21
         %24 = OpLoad %6 %23
         %26 = OpCompositeConstruct %7 %13 %16 %24 %25
               OpStore %15 %26
               OpStore %27 %32
         %34 = OpLoad %7 %9
         %35 = OpLoad %7 %15
         %36 = OpLoad %7 %27
         %37 = OpExtInst %7 %1 FaceForward %34 %35 %36
               OpStore %33 %37
         %38 = OpLoad %7 %33
         %46 = OpFOrdEqual %45 %38 %43
         %47 = OpAll %44 %46
               OpSelectionMerge %49 None
               OpBranchConditional %47 %48 %54
         %48 = OpLabel
               OpStore %51 %53
               OpBranch %49
         %54 = OpLabel
               OpStore %51 %55
               OpBranch %49
         %49 = OpLabel
               OpReturn
               OpFunctionEnd
END

# uniforms for variant

# quarter
BUFFER variant_quarter DATA_TYPE float DATA
 0.25
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_quarter 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