#!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: Calls a function containing a discard

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

# Optimized using spirv-opt with the following arguments:
# '--eliminate-dead-branches'
# '--merge-return'
# '--eliminate-dead-branches'
# '--merge-blocks'
# '--eliminate-local-single-block'
# '--eliminate-dead-branches'
# '--merge-return'
# '--ccp'
# '--scalar-replacement=100'
# '--eliminate-local-single-block'
# '--simplify-instructions'
# '--redundancy-elimination'
# '--eliminate-local-multi-store'
# '--private-to-local'
# '--if-conversion'
# '--private-to-local'
# spirv-opt commit hash: 18b3b94567a9251a6f8491a6d07c4422abadd22c


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;
#
# layout(set = 0, binding = 0) uniform buf0
# {
#     float one;
# };
#
# void func()
# {
#     if (1.0 > one) // Always false
#     {
#         discard;
#     }
# }
#
# void main()
# {
#     _GLF_color = vec4(0);
#     do
#     {
#         func();
#     } while (false);
#     _GLF_color = vec4(1, 0, 0, 1);
# }
SHADER fragment variant_fragment_shader SPIRV-ASM
; SPIR-V
; Version: 1.0
; Generator: Khronos Glslang Reference Front End; 8
; Bound: 35
; 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 %6 "func("
               OpName %10 "buf0"
               OpMemberName %10 0 "one"
               OpName %12 ""
               OpName %25 "_GLF_color"
               OpMemberDecorate %10 0 Offset 0
               OpDecorate %10 Block
               OpDecorate %12 DescriptorSet 0
               OpDecorate %12 Binding 0
               OpDecorate %25 Location 0
          %2 = OpTypeVoid
          %3 = OpTypeFunction %2
          %8 = OpTypeFloat 32
          %9 = OpConstant %8 1
         %10 = OpTypeStruct %8
         %11 = OpTypePointer Uniform %10
         %12 = OpVariable %11 Uniform
         %13 = OpTypeInt 32 1
         %14 = OpConstant %13 0
         %15 = OpTypePointer Uniform %8
         %18 = OpTypeBool
         %23 = OpTypeVector %8 4
         %24 = OpTypePointer Output %23
         %25 = OpVariable %24 Output
         %26 = OpConstant %8 0
         %27 = OpConstantComposite %23 %26 %26 %26 %26
         %33 = OpConstantFalse %18
         %34 = OpConstantComposite %23 %9 %26 %26 %9
          %4 = OpFunction %2 None %3
          %5 = OpLabel
               OpStore %25 %27
               OpBranch %28
         %28 = OpLabel
         %32 = OpFunctionCall %2 %6
               OpLoopMerge %30 %28 None
               OpBranchConditional %33 %28 %30
         %30 = OpLabel
               OpStore %25 %34
               OpReturn
               OpFunctionEnd
          %6 = OpFunction %2 None %3
          %7 = OpLabel
         %16 = OpAccessChain %15 %12 %14
         %17 = OpLoad %8 %16
         %19 = OpFOrdGreaterThan %18 %9 %17
               OpSelectionMerge %21 None
               OpBranchConditional %19 %20 %21
         %20 = OpLabel
               OpKill
         %21 = OpLabel
               OpReturn
               OpFunctionEnd
END

# uniforms for variant

# one
BUFFER variant_one DATA_TYPE float DATA
 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_one 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