#!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 instruction simplification 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;
#
# layout(set = 0, binding = 0) uniform buf0
# {
#     float three;
# };
#
# void main()
# {
#     // f becomes 3.0 * 2^0 = 3.0.
#     float f = ldexp(three, 0);
#
#     if (f == 3.0)
#         _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: 32
; Schema: 0
               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %4 "main" %26
               OpExecutionMode %4 OriginUpperLeft
               OpSource ESSL 310
               OpName %4 "main"
               OpName %8 "f"
               OpName %9 "buf0"
               OpMemberName %9 0 "three"
               OpName %11 ""
               OpName %26 "_GLF_color"
               OpMemberDecorate %9 0 Offset 0
               OpDecorate %9 Block
               OpDecorate %11 DescriptorSet 0
               OpDecorate %11 Binding 0
               OpDecorate %26 Location 0
          %2 = OpTypeVoid
          %3 = OpTypeFunction %2
          %6 = OpTypeFloat 32
          %7 = OpTypePointer Function %6
          %9 = OpTypeStruct %6
         %10 = OpTypePointer Uniform %9
         %11 = OpVariable %10 Uniform
         %12 = OpTypeInt 32 1
         %13 = OpConstant %12 0
         %14 = OpTypePointer Uniform %6
         %19 = OpConstant %6 3
         %20 = OpTypeBool
         %24 = OpTypeVector %6 4
         %25 = OpTypePointer Output %24
         %26 = OpVariable %25 Output
         %27 = OpConstant %6 1
         %28 = OpConstant %6 0
         %29 = OpConstantComposite %24 %27 %28 %28 %27
         %31 = OpConstantComposite %24 %28 %28 %28 %28
          %4 = OpFunction %2 None %3
          %5 = OpLabel
          %8 = OpVariable %7 Function
         %15 = OpAccessChain %14 %11 %13
         %16 = OpLoad %6 %15
         %17 = OpExtInst %6 %1 Ldexp %16 %13
               OpStore %8 %17
         %18 = OpLoad %6 %8
         %21 = OpFOrdEqual %20 %18 %19
               OpSelectionMerge %23 None
               OpBranchConditional %21 %22 %30
         %22 = OpLabel
               OpStore %26 %29
               OpBranch %23
         %30 = OpLabel
               OpStore %26 %31
               OpBranch %23
         %23 = OpLabel
               OpReturn
               OpFunctionEnd
END

# uniforms for variant

# three
BUFFER variant_three DATA_TYPE float DATA
 3.0
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_three 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