#!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 two nested for loops with return

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

# Optimized using spirv-opt with the following arguments:
# '--private-to-local'
# '--if-conversion'
# '--eliminate-dead-inserts'
# '--eliminate-dead-branches'
# '--reduce-load-size'
# '--vector-dce'
# '--ccp'
# '--redundancy-elimination'
# '--convert-local-access-chains'
# '--eliminate-dead-inserts'
# '--ccp'
# '--eliminate-dead-branches'
# '--merge-blocks'
# '--eliminate-local-single-block'
# '--eliminate-local-single-block'
# '--copy-propagate-arrays'
# '--inline-entry-points-exhaustive'
# '--ccp'
# '--eliminate-local-multi-store'
# '--inline-entry-points-exhaustive'
# '--reduce-load-size'
# '--ccp'
# '--eliminate-local-single-block'
# '--eliminate-dead-branches'
# spirv-opt commit hash: 230c9e437146e48ec58adb4433890403c23c98fa


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;
#
# float nb_mod(float limit)
# {
#   if (float(1) >= limit)
#   {
#     return 1.0;
#   }
#   for (
#       int _injected_loop_counter = 0;
#       _injected_loop_counter < 2;
#       ++_injected_loop_counter)
#   {
#     for (
#         int _injected_loop_counter = 0;
#         _injected_loop_counter < 1;
#         ++_injected_loop_counter)
#     {
#       return 1.0;
#     }
#   }
# }
# void main()
# {
#   nb_mod(gl_FragCoord.x);
#   _GLF_color = vec4(1.0, 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: 66
; Schema: 0
               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %4 "main" %48 %57
               OpExecutionMode %4 OriginUpperLeft
               OpSource ESSL 310
               OpName %4 "main"
               OpName %10 "nb_mod(f1;"
               OpName %9 "limit"
               OpName %21 "_injected_loop_counter"
               OpName %31 "_injected_loop_counter"
               OpName %48 "gl_FragCoord"
               OpName %49 "param"
               OpName %57 "_GLF_color"
               OpDecorate %21 RelaxedPrecision
               OpDecorate %31 RelaxedPrecision
               OpDecorate %48 BuiltIn FragCoord
               OpDecorate %57 Location 0
          %2 = OpTypeVoid
          %3 = OpTypeFunction %2
          %6 = OpTypeFloat 32
          %7 = OpTypePointer Function %6
          %8 = OpTypeFunction %6 %7
         %12 = OpConstant %6 1
         %14 = OpTypeBool
         %19 = OpTypeInt 32 1
         %20 = OpTypePointer Function %19
         %22 = OpConstant %19 0
         %29 = OpConstant %19 2
         %38 = OpConstant %19 1
         %46 = OpTypeVector %6 4
         %47 = OpTypePointer Input %46
         %48 = OpVariable %47 Input
         %50 = OpTypeInt 32 0
         %51 = OpConstant %50 0
         %52 = OpTypePointer Input %6
         %56 = OpTypePointer Output %46
         %57 = OpVariable %56 Output
         %58 = OpConstant %6 0
         %59 = OpConstantComposite %46 %12 %58 %58 %12
         %63 = OpUndef %19
         %64 = OpConstantTrue %14
          %4 = OpFunction %2 None %3
          %5 = OpLabel
         %49 = OpVariable %7 Function
         %53 = OpAccessChain %52 %48 %51
         %54 = OpLoad %6 %53
               OpStore %49 %54
         %55 = OpFunctionCall %6 %10 %49
               OpStore %57 %59
               OpReturn
               OpFunctionEnd
         %10 = OpFunction %6 None %8
          %9 = OpFunctionParameter %7
         %11 = OpLabel
         %21 = OpVariable %20 Function
         %31 = OpVariable %20 Function
         %13 = OpLoad %6 %9
         %15 = OpFOrdGreaterThanEqual %14 %12 %13
               OpSelectionMerge %17 None
               OpBranchConditional %15 %16 %17
         %16 = OpLabel
               OpReturnValue %12
         %17 = OpLabel
               OpStore %21 %22
               OpBranch %23
         %23 = OpLabel
         %30 = OpSLessThan %14 %22 %29
               OpLoopMerge %25 %34 None
               OpBranch %24
         %24 = OpLabel
               OpStore %31 %22
               OpBranch %32
         %32 = OpLabel
         %39 = OpSLessThan %14 %22 %38
               OpLoopMerge %65 %35 None
               OpBranch %33
         %65 = OpLabel
               OpBranch %34
         %33 = OpLabel
               OpReturnValue %12
         %35 = OpLabel
               OpBranch %32
         %34 = OpLabel
               OpBranch %23
         %25 = OpLabel
               OpUnreachable
               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