#!amber

# Copyright 2019 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 constant handling 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
# {
#     vec2 one;
# };
#
# void main()
# {
#     // Mixing (1, 1) and (1, 1) is still (1, 1).
#     vec2 mixed = mix(vec2(1), one, 0.5);
#
#     // If condition is always true.
#     if (mixed == vec2(1))
#         _GLF_color = vec4(mixed.x, 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: 42
; Schema: 0
               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %4 "main" %32
               OpExecutionMode %4 OriginUpperLeft
               OpSource ESSL 310
               OpName %4 "main"
               OpName %9 "mixed"
               OpName %12 "buf0"
               OpMemberName %12 0 "one"
               OpName %14 ""
               OpName %32 "_GLF_color"
               OpMemberDecorate %12 0 Offset 0
               OpDecorate %12 Block
               OpDecorate %14 DescriptorSet 0
               OpDecorate %14 Binding 0
               OpDecorate %32 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 = OpTypeStruct %7
         %13 = OpTypePointer Uniform %12
         %14 = OpVariable %13 Uniform
         %15 = OpTypeInt 32 1
         %16 = OpConstant %15 0
         %17 = OpTypePointer Uniform %7
         %20 = OpConstant %6 0.5
         %24 = OpTypeBool
         %25 = OpTypeVector %24 2
         %30 = OpTypeVector %6 4
         %31 = OpTypePointer Output %30
         %32 = OpVariable %31 Output
         %33 = OpTypeInt 32 0
         %34 = OpConstant %33 0
         %35 = OpTypePointer Function %6
         %38 = OpConstant %6 0
         %41 = OpConstantComposite %30 %38 %38 %38 %38
          %4 = OpFunction %2 None %3
          %5 = OpLabel
          %9 = OpVariable %8 Function
         %18 = OpAccessChain %17 %14 %16
         %19 = OpLoad %7 %18
         %21 = OpCompositeConstruct %7 %20 %20
         %22 = OpExtInst %7 %1 FMix %11 %19 %21
               OpStore %9 %22
         %23 = OpLoad %7 %9
         %26 = OpFOrdEqual %25 %23 %11
         %27 = OpAll %24 %26
               OpSelectionMerge %29 None
               OpBranchConditional %27 %28 %40
         %28 = OpLabel
         %36 = OpAccessChain %35 %9 %34
         %37 = OpLoad %6 %36
         %39 = OpCompositeConstruct %30 %37 %38 %38 %10
               OpStore %32 %39
               OpBranch %29
         %40 = OpLabel
               OpStore %32 %41
               OpBranch %29
         %29 = OpLabel
               OpReturn
               OpFunctionEnd
END

# uniforms for variant

# one
BUFFER variant_one DATA_TYPE vec2<float> DATA
 1.0 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