#!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: A fragment shader with uninitialized element cast in loop

# The test passes because main always writes the color red.

# Optimized using spirv-opt with the following arguments:
# '--inline-entry-points-exhaustive'
# '--eliminate-local-single-block'
# '--ccp'
# '--eliminate-local-multi-store'
# '--inline-entry-points-exhaustive'
# '--combine-access-chains'
# '--combine-access-chains'
# '--reduce-load-size'
# '--copy-propagate-arrays'
# '--reduce-load-size'
# '--eliminate-local-multi-store'
# '--scalar-replacement=100'
# '--convert-local-access-chains'
# '--scalar-replacement=100'
# '--vector-dce'
# '--eliminate-dead-inserts'
# '--scalar-replacement=100'
# '--eliminate-dead-inserts'
# '--simplify-instructions'
# '--eliminate-dead-branches'
# '--merge-blocks'
# '--ccp'
# '--copy-propagate-arrays'
# '--combine-access-chains'
# '--eliminate-local-multi-store'
# spirv-opt commit hash: 06407250a169c6a03b3765e86619075af1a8c187


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;
# layout(set = 0, binding = 0) uniform buf0 { vec2 injectionSwitch; };
#
# void main()
# {
#   while(true)
#   {
#     while(false)
#       break;
#
#     float uninit[1];
#     float(uninit[0]);
#
#     if (injectionSwitch.x < injectionSwitch.y) // always true
#     {
#       _GLF_color = vec4(1.0, 0.0, 0.0, 1.0);
#       return;
#     }
#   }
# }
SHADER fragment variant_fragment_shader SPIRV-ASM
; SPIR-V
; Version: 1.0
; Generator: Khronos Glslang Reference Front End; 7
; Bound: 56
; Schema: 0
               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %4 "main" %46
               OpExecutionMode %4 OriginUpperLeft
               OpSource ESSL 310
               OpName %4 "main"
               OpName %32 "buf0"
               OpMemberName %32 0 "injectionSwitch"
               OpName %34 ""
               OpName %46 "_GLF_color"
               OpMemberDecorate %32 0 Offset 0
               OpDecorate %32 Block
               OpDecorate %34 DescriptorSet 0
               OpDecorate %34 Binding 0
               OpDecorate %46 Location 0
          %2 = OpTypeVoid
          %3 = OpTypeFunction %2
         %11 = OpTypeBool
         %12 = OpConstantTrue %11
         %18 = OpConstantFalse %11
         %20 = OpTypeFloat 32
         %21 = OpTypeInt 32 0
         %22 = OpConstant %21 1
         %23 = OpTypeArray %20 %22
         %24 = OpTypePointer Function %23
         %26 = OpTypeInt 32 1
         %27 = OpConstant %26 0
         %28 = OpTypePointer Function %20
         %31 = OpTypeVector %20 2
         %32 = OpTypeStruct %31
         %33 = OpTypePointer Uniform %32
         %34 = OpVariable %33 Uniform
         %35 = OpConstant %21 0
         %36 = OpTypePointer Uniform %20
         %44 = OpTypeVector %20 4
         %45 = OpTypePointer Output %44
         %46 = OpVariable %45 Output
         %47 = OpConstant %20 1
         %48 = OpConstant %20 0
         %49 = OpConstantComposite %44 %47 %48 %48 %47
         %54 = OpUndef %20
          %4 = OpFunction %2 None %3
          %5 = OpLabel
         %51 = OpVariable %28 Function
               OpBranch %6
          %6 = OpLabel
         %53 = OpPhi %20 %54 %5 %52 %43
               OpLoopMerge %8 %43 None
               OpBranch %13
         %13 = OpLabel
         %52 = OpPhi %20 %53 %6 %54 %16
         %37 = OpAccessChain %36 %34 %27 %35
         %38 = OpLoad %20 %37
         %39 = OpAccessChain %36 %34 %27 %22
         %40 = OpLoad %20 %39
         %41 = OpFOrdLessThan %11 %38 %40
               OpSelectionMerge %55 None
               OpBranchConditional %41 %42 %43
         %16 = OpLabel
               OpBranch %13
         %42 = OpLabel
               OpStore %46 %49
               OpReturn
         %55 = OpLabel
               OpBranch %43
         %43 = OpLabel
               OpBranch %6
          %8 = OpLabel
               OpUnreachable
               OpFunctionEnd
END

# uniforms for variant

# injectionSwitch
BUFFER variant_injectionSwitch DATA_TYPE vec2<float> DATA
 0.0 1.0
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_injectionSwitch 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