#!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(location = 0) out vec4 _GLF_color;
#
# void main()
# {
#     // Constant vector doesn't change between fragments.
#     vec4 diff = dFdy(acosh(vec4(8.0, 2.0, 3.5, 3.4)));
#
#     if (diff == vec4(0))
#         _GLF_color = vec4(1, 0, 0, 1);
#     else
#         _GLF_color = diff;
# }
SHADER fragment variant_fragment_shader SPIRV-ASM
; SPIR-V
; Version: 1.0
; Generator: Khronos Glslang Reference Front End; 8
; Bound: 32
; Schema: 0
               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %4 "main" %27
               OpExecutionMode %4 OriginUpperLeft
               OpSource ESSL 310
               OpName %4 "main"
               OpName %9 "diff"
               OpName %27 "_GLF_color"
               OpDecorate %27 Location 0
          %2 = OpTypeVoid
          %3 = OpTypeFunction %2
          %6 = OpTypeFloat 32
          %7 = OpTypeVector %6 4
          %8 = OpTypePointer Function %7
         %10 = OpConstant %6 8
         %11 = OpConstant %6 2
         %12 = OpConstant %6 3.5
         %13 = OpConstant %6 3.4000001
         %14 = OpConstantComposite %7 %10 %11 %12 %13
         %18 = OpConstant %6 0
         %19 = OpConstantComposite %7 %18 %18 %18 %18
         %20 = OpTypeBool
         %21 = OpTypeVector %20 4
         %26 = OpTypePointer Output %7
         %27 = OpVariable %26 Output
         %28 = OpConstant %6 1
         %29 = OpConstantComposite %7 %28 %18 %18 %28
          %4 = OpFunction %2 None %3
          %5 = OpLabel
          %9 = OpVariable %8 Function
         %15 = OpExtInst %7 %1 Acosh %14
         %16 = OpDPdy %7 %15
               OpStore %9 %16
         %17 = OpLoad %7 %9
         %22 = OpFOrdEqual %21 %17 %19
         %23 = OpAll %20 %22
               OpSelectionMerge %25 None
               OpBranchConditional %23 %24 %30
         %24 = OpLabel
               OpStore %27 %29
               OpBranch %25
         %30 = OpLabel
         %31 = OpLoad %7 %9
               OpStore %27 %31
               OpBranch %25
         %25 = OpLabel
               OpReturn
               OpFunctionEnd
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
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