#!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 constant folding 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
# {
#     float one;
# };
#
# void main()
# {
#     _GLF_color = vec4(0);
#
#     float f = clamp(one, 1.0, 1.0);
#
#     if (f > one) // Always false.
#         _GLF_color = vec4(0);
#     else
#         _GLF_color = vec4(f, 0, 0, 1);
# }
SHADER fragment variant_fragment_shader SPIRV-ASM
; SPIR-V
; Version: 1.0
; Generator: Khronos Glslang Reference Front End; 8
; Bound: 34
; Schema: 0
               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %4 "main" %9
               OpExecutionMode %4 OriginUpperLeft
               OpSource ESSL 310
               OpName %4 "main"
               OpName %9 "_GLF_color"
               OpName %13 "f"
               OpName %14 "buf0"
               OpMemberName %14 0 "one"
               OpName %16 ""
               OpDecorate %9 Location 0
               OpMemberDecorate %14 0 Offset 0
               OpDecorate %14 Block
               OpDecorate %16 DescriptorSet 0
               OpDecorate %16 Binding 0
          %2 = OpTypeVoid
          %3 = OpTypeFunction %2
          %6 = OpTypeFloat 32
          %7 = OpTypeVector %6 4
          %8 = OpTypePointer Output %7
          %9 = OpVariable %8 Output
         %10 = OpConstant %6 0
         %11 = OpConstantComposite %7 %10 %10 %10 %10
         %12 = OpTypePointer Function %6
         %14 = OpTypeStruct %6
         %15 = OpTypePointer Uniform %14
         %16 = OpVariable %15 Uniform
         %17 = OpTypeInt 32 1
         %18 = OpConstant %17 0
         %19 = OpTypePointer Uniform %6
         %22 = OpConstant %6 1
         %27 = OpTypeBool
          %4 = OpFunction %2 None %3
          %5 = OpLabel
         %13 = OpVariable %12 Function
               OpStore %9 %11
         %20 = OpAccessChain %19 %16 %18
         %21 = OpLoad %6 %20
         %23 = OpExtInst %6 %1 FClamp %21 %22 %22
               OpStore %13 %23
         %24 = OpLoad %6 %13
         %25 = OpAccessChain %19 %16 %18
         %26 = OpLoad %6 %25
         %28 = OpFOrdGreaterThan %27 %24 %26
               OpSelectionMerge %30 None
               OpBranchConditional %28 %29 %31
         %29 = OpLabel
               OpStore %9 %11
               OpBranch %30
         %31 = OpLabel
         %32 = OpLoad %6 %13
         %33 = OpCompositeConstruct %7 %32 %10 %10 %22
               OpStore %9 %33
               OpBranch %30
         %30 = OpLabel
               OpReturn
               OpFunctionEnd
END

# uniforms for variant

# one
BUFFER variant_one DATA_TYPE float DATA
 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