#!amber

# Copyright 2021 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 the GraphicsFuzz project.

# Short description: A fragment shader that covers specific LLVM code paths

# 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 320 es
#
# precision highp int;
# precision highp float;
#
# layout(location = 0) out vec4 _GLF_color;
#
# // Always returns (1, 0, 0, 1)
# vec4 func()
# {
#     switch(0)
#     {
#         case 0:
#             return vec4(1, 0, 0, 1);
#         default:
#             return vec4(0);
#     }
# }
#
# void main()
# {
#     _GLF_color = func();
# }
SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0
; SPIR-V
; Version: 1.0
; Generator: Khronos Glslang Reference Front End; 10
; Bound: 27
; Schema: 0
               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %4 "main" %25
               OpExecutionMode %4 OriginUpperLeft
               OpSource ESSL 320
               OpName %4 "main"
               OpName %9 "func("
               OpName %25 "_GLF_color"
               OpDecorate %25 Location 0
          %2 = OpTypeVoid
          %3 = OpTypeFunction %2
          %6 = OpTypeFloat 32
          %7 = OpTypeVector %6 4
          %8 = OpTypeFunction %7
         %11 = OpTypeInt 32 1
         %12 = OpConstant %11 0
         %16 = OpConstant %6 1
         %17 = OpConstant %6 0
         %18 = OpConstantComposite %7 %16 %17 %17 %16
         %20 = OpConstantComposite %7 %17 %17 %17 %17
         %24 = OpTypePointer Output %7
         %25 = OpVariable %24 Output
          %4 = OpFunction %2 None %3
          %5 = OpLabel
         %26 = OpFunctionCall %7 %9
               OpStore %25 %26
               OpReturn
               OpFunctionEnd
          %9 = OpFunction %7 None %8
         %10 = OpLabel
               OpSelectionMerge %15 None
               OpSwitch %12 %14 0 %13
         %14 = OpLabel
               OpReturnValue %20
         %13 = OpLabel
               OpReturnValue %18
         %15 = OpLabel
               OpUnreachable
               OpFunctionEnd
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
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