#!amber

# Copyright 2019 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 bug found by GraphicsFuzz.

# Short description: Fragment shader with 1-iteration loop and smoothstep

# The test passes because the loop exits immediately and red is written

SHADER vertex variant_vertex_shader PASSTHROUGH

# variant_fragment_shader is derived from the following GLSL:
# #version 310 es
# precision highp float;
#
# precision highp int;
#
# layout(location = 0) out vec4 _GLF_color;
#
# void main()
# {
#  while(true)
#   {
#    if(true)
#     {
#      break;
#     }
#    int GLF_live9r;
#    vec2(1.0)[clamp(GLF_live9r, 0, 1)];
#   }
#  float g = 3.0;
#  _GLF_color = vec4(smoothstep(0.0, 1.0, g), 0.0, 0.0, 1.0);
# }
SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0
; SPIR-V
; Version: 1.0
; Generator: Khronos Glslang Reference Front End; 7
; Bound: 37
; Schema: 0
               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %4 "main" %32
               OpExecutionMode %4 OriginUpperLeft
               OpSource ESSL 310
               OpName %4 "main"
               OpName %22 "GLF_live9r"
               OpName %28 "g"
               OpName %32 "_GLF_color"
               OpDecorate %32 Location 0
          %2 = OpTypeVoid
          %3 = OpTypeFunction %2
         %11 = OpTypeBool
         %12 = OpConstantTrue %11
         %16 = OpTypeFloat 32
         %17 = OpTypeVector %16 2
         %18 = OpConstant %16 1
         %19 = OpConstantComposite %17 %18 %18
         %20 = OpTypeInt 32 1
         %21 = OpTypePointer Function %20
         %24 = OpConstant %20 0
         %25 = OpConstant %20 1
         %27 = OpTypePointer Function %16
         %29 = OpConstant %16 3
         %30 = OpTypeVector %16 4
         %31 = OpTypePointer Output %30
         %32 = OpVariable %31 Output
         %33 = OpConstant %16 0
          %4 = OpFunction %2 None %3
          %5 = OpLabel
         %22 = OpVariable %21 Function
         %28 = OpVariable %27 Function
               OpBranch %6
          %6 = OpLabel
               OpLoopMerge %8 %9 None
               OpBranch %10
         %10 = OpLabel
               OpBranchConditional %12 %7 %8
          %7 = OpLabel
               OpSelectionMerge %14 None
               OpBranchConditional %12 %13 %14
         %13 = OpLabel
               OpBranch %8
         %14 = OpLabel
         %23 = OpLoad %20 %22
         %26 = OpExtInst %20 %1 SClamp %23 %24 %25
               OpBranch %9
          %9 = OpLabel
               OpBranch %6
          %8 = OpLabel
               OpStore %28 %29
         %34 = OpLoad %16 %28
         %35 = OpExtInst %16 %1 SmoothStep %33 %18 %34
         %36 = OpCompositeConstruct %30 %35 %33 %33 %18
               OpStore %32 %36
               OpReturn
               OpFunctionEnd
END

# uniforms for variant


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