#!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 an always false if.

# The test passes because the shader always writes color red.
# Function brick() writes red in the beginning and returns in the end.

# Optimized using spirv-opt with the following arguments:
# '--eliminate-dead-branches'
# '--merge-blocks'
# '--inline-entry-points-exhaustive'
# '--scalar-replacement=100'
# '--eliminate-local-single-block'
# '--eliminate-local-single-block'
# '--eliminate-dead-branches'
# '--merge-blocks'
# '--eliminate-dead-code-aggressive'
# '--eliminate-dead-branches'
# '--convert-local-access-chains'
# '--scalar-replacement=100'
# '--reduce-load-size'
# '--scalar-replacement=100'
# '--redundancy-elimination'
# '--convert-local-access-chains'
# '--eliminate-dead-branches'
# '--merge-blocks'
# '--eliminate-dead-branches'
# '--vector-dce'
# '--eliminate-local-single-block'
# '--private-to-local'
# '--copy-propagate-arrays'
# '--eliminate-dead-branches'
# '--redundancy-elimination'
# '--vector-dce'
# '--scalar-replacement=100'
# '--eliminate-local-multi-store'
# '--scalar-replacement=100'
# '--redundancy-elimination'
# '--redundancy-elimination'
# '--copy-propagate-arrays'
# spirv-opt commit hash: 6b072126595dd8c2448eb1fda616251c5e6d7079



SHADER vertex variant_vertex_shader PASSTHROUGH

# variant_fragment_shader is derived from the following GLSL:
# #version 310 es
# precision highp float;
#
# layout(set = 0, binding = 0) uniform buf0
# {
#     vec2 injectionSwitch;
# };
#
# layout(location = 0) out vec4 _GLF_color;
#
# vec2 brick(vec2 uv)
# {
#     _GLF_color = vec4(1.0, 0.0, 0.0, 1.0); // Write color red
#
#     int a;
#     do
#     {
#         if (injectionSwitch.y < 0.0) // Always false
#         {
#             return vec2(1.0);
#         }
#         uv.y -= 1.0;
#     } while (false);
#
#     uv.y -= 1.0;
#     return vec2(1.0);
# }
#
# void main()
# {
#     brick(vec2(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: 54
; Schema: 0
               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %4 "main" %15
               OpExecutionMode %4 OriginUpperLeft
               OpSource ESSL 310
               OpName %4 "main"
               OpName %11 "brick(vf2;"
               OpName %10 "uv"
               OpName %15 "_GLF_color"
               OpName %23 "buf0"
               OpMemberName %23 0 "injectionSwitch"
               OpName %25 ""
               OpName %51 "param"
               OpDecorate %15 Location 0
               OpMemberDecorate %23 0 Offset 0
               OpDecorate %23 Block
               OpDecorate %25 DescriptorSet 0
               OpDecorate %25 Binding 0
          %2 = OpTypeVoid
          %3 = OpTypeFunction %2
          %6 = OpTypeFloat 32
          %7 = OpTypeVector %6 2
          %8 = OpTypePointer Function %7
          %9 = OpTypeFunction %7 %8
         %13 = OpTypeVector %6 4
         %14 = OpTypePointer Output %13
         %15 = OpVariable %14 Output
         %16 = OpConstant %6 1
         %17 = OpConstant %6 0
         %18 = OpConstantComposite %13 %16 %17 %17 %16
         %23 = OpTypeStruct %7
         %24 = OpTypePointer Uniform %23
         %25 = OpVariable %24 Uniform
         %26 = OpTypeInt 32 1
         %27 = OpConstant %26 0
         %28 = OpTypeInt 32 0
         %29 = OpConstant %28 1
         %30 = OpTypePointer Uniform %6
         %33 = OpTypeBool
         %37 = OpConstantComposite %7 %16 %16
         %39 = OpTypePointer Function %6
         %44 = OpConstantFalse %33
          %4 = OpFunction %2 None %3
          %5 = OpLabel
         %51 = OpVariable %8 Function
               OpStore %51 %37
         %52 = OpFunctionCall %7 %11 %51
               OpReturn
               OpFunctionEnd
         %11 = OpFunction %7 None %9
         %10 = OpFunctionParameter %8
         %12 = OpLabel
               OpStore %15 %18
               OpBranch %19
         %19 = OpLabel
               OpLoopMerge %21 %36 None
               OpBranch %20
         %20 = OpLabel
         %31 = OpAccessChain %30 %25 %27 %29
         %32 = OpLoad %6 %31
         %34 = OpFOrdLessThan %33 %32 %17
               OpSelectionMerge %53 None
               OpBranchConditional %34 %35 %36
         %35 = OpLabel
               OpReturnValue %37
         %53 = OpLabel
               OpBranch %36
         %36 = OpLabel
         %40 = OpAccessChain %39 %10 %29
         %41 = OpLoad %6 %40
         %42 = OpFSub %6 %41 %16
               OpStore %40 %42
               OpBranchConditional %44 %19 %21
         %21 = OpLabel
         %46 = OpLoad %6 %40
         %47 = OpFSub %6 %46 %16
               OpStore %40 %47
               OpReturnValue %37
               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