#!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;
# precision highp int;
#
# layout(location = 0) out vec4 _GLF_color;
# layout(set = 0, binding = 0) uniform buf0
# {
#     int zero;
# };
#
# void main()
# {
#     vec2 a = vec2(1);
#
#     if (zero == 1) // Always false.
#         a.x += 1.0;
#
#     vec2 b = a.y + vec2(2, 3);
#
#     if (b == vec2(3, 4)) // Always true.
#         _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 "a"
               OpName %13 "buf0"
               OpMemberName %13 0 "zero"
               OpName %15 ""
               OpName %32 "b"
               OpName %51 "_GLF_color"
               OpMemberDecorate %13 0 Offset 0
               OpDecorate %13 Block
               OpDecorate %15 DescriptorSet 0
               OpDecorate %15 Binding 0
               OpDecorate %51 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 = OpTypeInt 32 1
         %13 = OpTypeStruct %12
         %14 = OpTypePointer Uniform %13
         %15 = OpVariable %14 Uniform
         %16 = OpConstant %12 0
         %17 = OpTypePointer Uniform %12
         %20 = OpConstant %12 1
         %21 = OpTypeBool
         %25 = OpTypeInt 32 0
         %26 = OpConstant %25 0
         %27 = OpTypePointer Function %6
         %33 = OpConstant %25 1
         %36 = OpConstant %6 2
         %37 = OpConstant %6 3
         %38 = OpConstantComposite %7 %36 %37
         %42 = OpConstant %6 4
         %43 = OpConstantComposite %7 %37 %42
         %44 = OpTypeVector %21 2
         %49 = OpTypeVector %6 4
         %50 = OpTypePointer Output %49
         %51 = OpVariable %50 Output
         %52 = OpConstant %6 0
         %53 = OpConstantComposite %49 %10 %52 %52 %10
         %55 = OpConstantComposite %49 %52 %52 %52 %52
          %4 = OpFunction %2 None %3
          %5 = OpLabel
          %9 = OpVariable %8 Function
         %32 = OpVariable %8 Function
               OpStore %9 %11
         %18 = OpAccessChain %17 %15 %16
         %19 = OpLoad %12 %18
         %22 = OpIEqual %21 %19 %20
               OpSelectionMerge %24 None
               OpBranchConditional %22 %23 %24
         %23 = OpLabel
         %28 = OpAccessChain %27 %9 %26
         %29 = OpLoad %6 %28
         %30 = OpFAdd %6 %29 %10
         %31 = OpAccessChain %27 %9 %26
               OpStore %31 %30
               OpBranch %24
         %24 = OpLabel
         %34 = OpAccessChain %27 %9 %33
         %35 = OpLoad %6 %34
         %39 = OpCompositeConstruct %7 %35 %35
         %40 = OpFAdd %7 %39 %38
               OpStore %32 %40
         %41 = OpLoad %7 %32
         %45 = OpFOrdEqual %44 %41 %43
         %46 = OpAll %21 %45
               OpSelectionMerge %48 None
               OpBranchConditional %46 %47 %54
         %47 = OpLabel
               OpStore %51 %53
               OpBranch %48
         %54 = OpLabel
               OpStore %51 %55
               OpBranch %48
         %48 = OpLabel
               OpReturn
               OpFunctionEnd
END

# uniforms for variant

# zero
BUFFER variant_zero DATA_TYPE int32 DATA
 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_zero 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