#!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(location = 0) out vec4 _GLF_color;
#
# void main()
# {
#     uint a = 4u;
#
#     switch(a / 2u)
#     {
#         case 2u:
#             // This branch is always executed.
#             _GLF_color = vec4(1, 0, 0, 1);
#             break;
#         default:
#             _GLF_color = vec4(0);
#             break;
#     }
# }
SHADER fragment variant_fragment_shader SPIRV-ASM
; SPIR-V
; Version: 1.0
; Generator: Khronos Glslang Reference Front End; 8
; Bound: 27
; Schema: 0
               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %4 "main" %19
               OpExecutionMode %4 OriginUpperLeft
               OpSource ESSL 310
               OpName %4 "main"
               OpName %8 "a"
               OpName %19 "_GLF_color"
               OpDecorate %8 RelaxedPrecision
               OpDecorate %10 RelaxedPrecision
               OpDecorate %12 RelaxedPrecision
               OpDecorate %19 Location 0
          %2 = OpTypeVoid
          %3 = OpTypeFunction %2
          %6 = OpTypeInt 32 0
          %7 = OpTypePointer Function %6
          %9 = OpConstant %6 4
         %11 = OpConstant %6 2
         %16 = OpTypeFloat 32
         %17 = OpTypeVector %16 4
         %18 = OpTypePointer Output %17
         %19 = OpVariable %18 Output
         %20 = OpConstant %16 1
         %21 = OpConstant %16 0
         %22 = OpConstantComposite %17 %20 %21 %21 %20
         %24 = OpConstantComposite %17 %21 %21 %21 %21
          %4 = OpFunction %2 None %3
          %5 = OpLabel
          %8 = OpVariable %7 Function
               OpStore %8 %9
         %10 = OpLoad %6 %8
         %12 = OpUDiv %6 %10 %11
               OpSelectionMerge %15 None
               OpSwitch %12 %14 2 %13
         %14 = OpLabel
               OpStore %19 %24
               OpBranch %15
         %13 = OpLabel
               OpStore %19 %22
               OpBranch %15
         %15 = OpLabel
               OpReturn
               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