#!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 vector DCE 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;
#
# void main()
# {
#     vec2 a = vec2(1);
#     a.x += 0.5;
#     vec2 b = fract(a);
#
#     if (b.x == 0.5) // Always true.
#         _GLF_color = vec4(1, 0, 0, 1);
#     else
#         _GLF_color = vec4(0);
# }
SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0
; SPIR-V
; Version: 1.0
; Generator: Khronos Glslang Reference Front End; 8
; Bound: 36
; Schema: 0
               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %4 "main" %31
               OpExecutionMode %4 OriginUpperLeft
               OpSource ESSL 310
               OpName %4 "main"
               OpName %9 "a"
               OpName %20 "b"
               OpName %31 "_GLF_color"
               OpDecorate %31 Location 0
          %2 = OpTypeVoid
          %3 = OpTypeFunction %2
          %6 = OpTypeFloat 32
          %7 = OpTypeVector %6 2
          %8 = OpTypePointer Function %7
         %10 = OpConstant %6 1
         %11 = OpConstantComposite %7 %10 %10
         %12 = OpConstant %6 0.5
         %13 = OpTypeInt 32 0
         %14 = OpConstant %13 0
         %15 = OpTypePointer Function %6
         %25 = OpTypeBool
         %29 = OpTypeVector %6 4
         %30 = OpTypePointer Output %29
         %31 = OpVariable %30 Output
         %32 = OpConstant %6 0
         %33 = OpConstantComposite %29 %10 %32 %32 %10
         %35 = OpConstantComposite %29 %32 %32 %32 %32
          %4 = OpFunction %2 None %3
          %5 = OpLabel
          %9 = OpVariable %8 Function
         %20 = OpVariable %8 Function
               OpStore %9 %11
         %16 = OpAccessChain %15 %9 %14
         %17 = OpLoad %6 %16
         %18 = OpFAdd %6 %17 %12
         %19 = OpAccessChain %15 %9 %14
               OpStore %19 %18
         %21 = OpLoad %7 %9
         %22 = OpExtInst %7 %1 Fract %21
               OpStore %20 %22
         %23 = OpAccessChain %15 %20 %14
         %24 = OpLoad %6 %23
         %26 = OpFOrdEqual %25 %24 %12
               OpSelectionMerge %28 None
               OpBranchConditional %26 %27 %34
         %27 = OpLabel
               OpStore %31 %33
               OpBranch %28
         %34 = OpLabel
               OpStore %31 %35
               OpBranch %28
         %28 = 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