#!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 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(set = 0, binding = 0) uniform buf0
# {
#     int four;
# };
# layout(location = 0) out vec4 _GLF_color;
#
# void main()
# {
#     // If condition is always true.
#     if(-(four / 2) == -2)
#         _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: 31
; Schema: 0
               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %4 "main" %25
               OpExecutionMode %4 OriginUpperLeft
               OpSource ESSL 310
               OpName %4 "main"
               OpName %7 "buf0"
               OpMemberName %7 0 "four"
               OpName %9 ""
               OpName %25 "_GLF_color"
               OpMemberDecorate %7 0 RelaxedPrecision
               OpMemberDecorate %7 0 Offset 0
               OpDecorate %7 Block
               OpDecorate %9 DescriptorSet 0
               OpDecorate %9 Binding 0
               OpDecorate %13 RelaxedPrecision
               OpDecorate %15 RelaxedPrecision
               OpDecorate %16 RelaxedPrecision
               OpDecorate %25 Location 0
          %2 = OpTypeVoid
          %3 = OpTypeFunction %2
          %6 = OpTypeInt 32 1
          %7 = OpTypeStruct %6
          %8 = OpTypePointer Uniform %7
          %9 = OpVariable %8 Uniform
         %10 = OpConstant %6 0
         %11 = OpTypePointer Uniform %6
         %14 = OpConstant %6 2
         %17 = OpConstant %6 -2
         %18 = OpTypeBool
         %22 = OpTypeFloat 32
         %23 = OpTypeVector %22 4
         %24 = OpTypePointer Output %23
         %25 = OpVariable %24 Output
         %26 = OpConstant %22 1
         %27 = OpConstant %22 0
         %28 = OpConstantComposite %23 %26 %27 %27 %26
         %30 = OpConstantComposite %23 %27 %27 %27 %27
          %4 = OpFunction %2 None %3
          %5 = OpLabel
         %12 = OpAccessChain %11 %9 %10
         %13 = OpLoad %6 %12
         %15 = OpSDiv %6 %13 %14
         %16 = OpSNegate %6 %15
         %19 = OpIEqual %18 %16 %17
               OpSelectionMerge %21 None
               OpBranchConditional %19 %20 %29
         %20 = OpLabel
               OpStore %25 %28
               OpBranch %21
         %29 = OpLabel
               OpStore %25 %30
               OpBranch %21
         %21 = OpLabel
               OpReturn
               OpFunctionEnd
END

# uniforms for variant

# four
BUFFER variant_four DATA_TYPE int32 DATA
 4
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_four 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