#!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 return before writing wrong color

# The test passes because the shader always writes color red.
# Main writes red and returns. Code after writing red is never executed.

# Optimized using spirv-opt with the following arguments:
# '--private-to-local'
# '--eliminate-local-multi-store'
# '--redundancy-elimination'
# '--eliminate-dead-code-aggressive'
# '--simplify-instructions'
# '--eliminate-dead-branches'
# '--merge-blocks'
# '--reduce-load-size'
# '--combine-access-chains'
# '--combine-access-chains'
# '--eliminate-dead-branches'
# '--ccp'
# '--redundancy-elimination'
# '--simplify-instructions'
# '--vector-dce'
# '--ccp'
# '--private-to-local'
# '--eliminate-dead-inserts'
# 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;
#
# precision highp int;
#
# struct _GLF_struct_0
# {
#   int msb9;
# };
#
# layout(location = 0) out vec4 _GLF_color;
#
# void main()
# {
#   _GLF_struct_0 _GLF_struct_replacement_0;
#
#   do
#   {
#     for (int j = 0; 1 < findLSB(1024); 1)
#     {
#       _GLF_color = vec4(1.0, 0.0, 0.0, 1.0); // Write color red
#       return; // We always return here. The code below is never executed.
#     }
#   } while (_GLF_struct_replacement_0.msb9 > 1);
#   _GLF_color = vec4(1.0, 1.0, _GLF_struct_replacement_0.msb9, 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" %27
               OpExecutionMode %4 OriginUpperLeft
               OpSource ESSL 310
               OpName %4 "main"
               OpName %27 "_GLF_color"
               OpName %32 "_GLF_struct_0"
               OpMemberName %32 0 "msb9"
               OpName %34 "_GLF_struct_replacement_0"
               OpDecorate %21 RelaxedPrecision
               OpDecorate %27 Location 0
          %2 = OpTypeVoid
          %3 = OpTypeFunction %2
         %10 = OpTypeInt 32 1
         %11 = OpTypePointer Function %10
         %13 = OpConstant %10 0
         %19 = OpConstant %10 1
         %20 = OpConstant %10 1024
         %22 = OpTypeBool
         %24 = OpTypeFloat 32
         %25 = OpTypeVector %24 4
         %26 = OpTypePointer Output %25
         %27 = OpVariable %26 Output
         %28 = OpConstant %24 1
         %29 = OpConstant %24 0
         %30 = OpConstantComposite %25 %28 %29 %29 %28
         %32 = OpTypeStruct %10
         %33 = OpTypePointer Function %32
          %4 = OpFunction %2 None %3
          %5 = OpLabel
         %34 = OpVariable %33 Function
               OpBranch %6
          %6 = OpLabel
               OpLoopMerge %8 %16 None
               OpBranch %14
         %14 = OpLabel
         %21 = OpExtInst %10 %1 FindILsb %20
         %23 = OpSLessThan %22 %19 %21
               OpLoopMerge %42 %17 None
               OpBranchConditional %23 %15 %42
         %15 = OpLabel
               OpStore %27 %30
               OpReturn
         %17 = OpLabel
               OpBranch %14
         %42 = OpLabel
               OpBranch %16
         %16 = OpLabel
         %35 = OpAccessChain %11 %34 %13
         %36 = OpLoad %10 %35
         %37 = OpSGreaterThan %22 %36 %19
               OpBranchConditional %37 %6 %8
          %8 = OpLabel
         %39 = OpLoad %10 %35
         %40 = OpConvertSToF %24 %39
         %41 = OpCompositeConstruct %25 %28 %28 %40 %28
               OpStore %27 %41
               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