#!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 the GraphicsFuzz project.

# Short description: A fragment shader that covers specific NIR 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;
#
# void main()
# {
#     float f = 2.0;
#
#     // Always true.
#     if(exp2(f) == 4.0)
#         _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; 10
; Bound: 25
; Schema: 0
               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %4 "main" %19
               OpExecutionMode %4 OriginUpperLeft
               OpSource ESSL 320
               OpName %4 "main"
               OpName %8 "f"
               OpName %19 "_GLF_color"
               OpDecorate %19 Location 0
          %2 = OpTypeVoid
          %3 = OpTypeFunction %2
          %6 = OpTypeFloat 32
          %7 = OpTypePointer Function %6
          %9 = OpConstant %6 2
         %12 = OpConstant %6 4
         %13 = OpTypeBool
         %17 = OpTypeVector %6 4
         %18 = OpTypePointer Output %17
         %19 = OpVariable %18 Output
         %20 = OpConstant %6 1
         %21 = OpConstant %6 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
         %11 = OpExtInst %6 %1 Exp2 %10
         %14 = OpFOrdEqual %13 %11 %12
               OpSelectionMerge %16 None
               OpBranchConditional %14 %15 %23
         %15 = OpLabel
               OpStore %19 %22
               OpBranch %16
         %23 = OpLabel
               OpStore %19 %24
               OpBranch %16
         %16 = 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