external/vulkancts/data/vulkan/amber/graphicsfuzz/unreachable-return-in-loop.amber

#!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 unreachable return in a loop

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

# Optimized using spirv-opt with the following arguments:
# '--simplify-instructions'
# '--eliminate-local-single-store'
# '--simplify-instructions'
# '--inline-entry-points-exhaustive'
# '--reduce-load-size'
# '--eliminate-dead-branches'
# '--merge-return'
# '--inline-entry-points-exhaustive'
# '--private-to-local'
# '--eliminate-dead-branches'
# '--merge-return'
# '--copy-propagate-arrays'
# '--convert-local-access-chains'
# '--eliminate-dead-branches'
# '--merge-return'
# '--eliminate-local-single-store'
# '--copy-propagate-arrays'
# '--scalar-replacement=100'
# '--eliminate-dead-branches'
# '--merge-blocks'
# '--eliminate-dead-branches'
# '--if-conversion'
# '--copy-propagate-arrays'
# '--reduce-load-size'
# '--eliminate-local-multi-store'
# '--eliminate-dead-code-aggressive'
# '--convert-local-access-chains'
# '--private-to-local'
# '--if-conversion'
# spirv-opt commit hash: ad7f2c5c4c7f51360e9e079109a9217aa5ba5cc0



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()
# {
#   for(int i = 1; i < 0; i++)
#     return;
#
#   _GLF_color = vec4(1.0, 0.0, 0.0, 1.0);
# }
SHADER fragment variant_fragment_shader SPIRV-ASM
; SPIR-V
; Version: 1.0
; Generator: Khronos Glslang Reference Front End; 7
; Bound: 43
; Schema: 0
               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %4 "main" %25
               OpExecutionMode %4 OriginUpperLeft
               OpSource ESSL 310
               OpName %4 "main"
               OpName %25 "_GLF_color"
               OpDecorate %25 Location 0
          %2 = OpTypeVoid
          %3 = OpTypeFunction %2
          %6 = OpTypeInt 32 1
          %9 = OpConstant %6 1
         %16 = OpConstant %6 0
         %17 = OpTypeBool
         %22 = OpTypeFloat 32
         %23 = OpTypeVector %22 4
         %24 = OpTypePointer Output %23
         %25 = OpVariable %24 Output
         %26 = OpConstant %22 1
         %27 = OpConstant %22 0
         %28 = OpConstantComposite %23 %26 %27 %27 %26
         %33 = OpConstantFalse %17
         %36 = OpConstantTrue %17
         %42 = OpUndef %17
          %4 = OpFunction %2 None %3
          %5 = OpLabel
               OpBranch %30
         %30 = OpLabel
         %41 = OpPhi %17 %33 %5 %42 %32
               OpLoopMerge %29 %32 None
               OpBranch %10
         %10 = OpLabel
         %40 = OpPhi %17 %41 %30 %42 %13
         %18 = OpSLessThan %17 %9 %16
               OpLoopMerge %12 %13 None
               OpBranchConditional %18 %11 %12
         %11 = OpLabel
               OpBranch %12
         %13 = OpLabel
               OpBranch %10
         %12 = OpLabel
         %39 = OpPhi %17 %40 %10 %36 %11
               OpSelectionMerge %37 None
               OpBranchConditional %39 %29 %37
         %37 = OpLabel
               OpStore %25 %28
               OpBranch %29
         %32 = OpLabel
               OpBranch %30
         %29 = OpLabel
               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