#!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 unreachable discard statement

# The test passes because the shader always writes the color red. The discard statement is never reached.

# Optimized using spirv-opt with the following arguments:
# '--scalar-replacement=100'
# '--private-to-local'
# '--eliminate-dead-branches'
# '--merge-return'
# '--eliminate-dead-branches'
# '--private-to-local'
# '--copy-propagate-arrays'
# '--scalar-replacement=100'
# '--combine-access-chains'
# '--vector-dce'
# '--convert-local-access-chains'
# '--if-conversion'
# '--eliminate-dead-branches'
# '--merge-return'
# '--ccp'
# '--eliminate-dead-branches'
# '--eliminate-dead-branches'
# '--merge-blocks'
# '--combine-access-chains'
# '--eliminate-local-single-block'
# '--copy-propagate-arrays'
# '--ccp'
# '--private-to-local'
# '--private-to-local'
# 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;
#
# vec3 mand()
# {
#     for (int k = 0; k < 1000; k++)
#         return vec3(1.0);
#
#     discard;    // This statement is never reached
#     return vec3(1.0);
# }
#
# void main()
# {
#     _GLF_color = vec4(1.0, 0.0, 0.0, 1.0);
#
#     for (int i = 0; i < 4; i++)
#         mand();
#
# }
SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0
; SPIR-V
; Version: 1.0
; Generator: Khronos Glslang Reference Front End; 7
; Bound: 63
; Schema: 0
               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %4 "main" %35
               OpExecutionMode %4 OriginUpperLeft
               OpSource ESSL 310
               OpName %4 "main"
               OpName %9 "mand("
               OpName %13 "k"
               OpName %35 "_GLF_color"
               OpName %38 "i"
               OpDecorate %13 RelaxedPrecision
               OpDecorate %20 RelaxedPrecision
               OpDecorate %35 Location 0
               OpDecorate %38 RelaxedPrecision
               OpDecorate %44 RelaxedPrecision
               OpDecorate %48 RelaxedPrecision
               OpDecorate %49 RelaxedPrecision
          %2 = OpTypeVoid
          %3 = OpTypeFunction %2
          %6 = OpTypeFloat 32
          %7 = OpTypeVector %6 3
          %8 = OpTypeFunction %7
         %11 = OpTypeInt 32 1
         %12 = OpTypePointer Function %11
         %14 = OpConstant %11 0
         %21 = OpConstant %11 1000
         %22 = OpTypeBool
         %24 = OpConstant %6 1
         %25 = OpConstantComposite %7 %24 %24 %24
         %28 = OpConstant %11 1
         %33 = OpTypeVector %6 4
         %34 = OpTypePointer Output %33
         %35 = OpVariable %34 Output
         %36 = OpConstant %6 0
         %37 = OpConstantComposite %33 %24 %36 %36 %24
         %45 = OpConstant %11 4
         %51 = OpTypePointer Function %7
         %57 = OpConstantFalse %22
         %58 = OpTypePointer Function %22
         %60 = OpConstantTrue %22
          %4 = OpFunction %2 None %3
          %5 = OpLabel
         %38 = OpVariable %12 Function
               OpStore %35 %37
               OpStore %38 %14
               OpBranch %39
         %39 = OpLabel
         %44 = OpLoad %11 %38
         %46 = OpSLessThan %22 %44 %45
               OpLoopMerge %41 %40 None
               OpBranchConditional %46 %40 %41
         %40 = OpLabel
         %47 = OpFunctionCall %7 %9
         %48 = OpLoad %11 %38
         %49 = OpIAdd %11 %48 %28
               OpStore %38 %49
               OpBranch %39
         %41 = OpLabel
               OpReturn
               OpFunctionEnd
          %9 = OpFunction %7 None %8
         %10 = OpLabel
         %59 = OpVariable %58 Function %57
         %52 = OpVariable %51 Function
         %13 = OpVariable %12 Function
               OpBranch %54
         %54 = OpLabel
               OpStore %13 %14
               OpLoopMerge %50 %56 None
               OpBranch %15
         %15 = OpLabel
         %20 = OpLoad %11 %13
         %23 = OpSLessThan %22 %20 %21
               OpLoopMerge %17 %18 None
               OpBranchConditional %23 %16 %17
         %16 = OpLabel
               OpStore %59 %60
               OpStore %52 %25
               OpBranch %17
         %18 = OpLabel
               OpBranch %15
         %17 = OpLabel
         %62 = OpLoad %22 %59
               OpSelectionMerge %61 None
               OpBranchConditional %62 %50 %61
         %61 = OpLabel
               OpKill
         %56 = OpLabel
               OpBranch %54
         %50 = OpLabel
         %53 = OpLoad %7 %52
               OpReturnValue %53
               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