#!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 discard keyword and a return

# The test passes because main always writes the color red; the discard statement is unreachable.

# Optimized using spirv-opt with the following arguments:
# '--eliminate-dead-branches'
# '--merge-return'
# '--eliminate-dead-branches'
# '--merge-blocks'
# 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;
# layout(set = 0, binding = 0) uniform buf0
# {
#     vec2 injectionSwitch;
# };
#
# vec3 computePoint()
# {
#     if (injectionSwitch.x > injectionSwitch.y) // always false
#     {
#     discard;
#     return vec3(1.0);
#     }
# }
# void main()
# {
#
#     computePoint();
#     if (false)
#     {
#     }
#     if (gl_FragCoord.x < 0.0)
#     {
#         return;
#     }
#     computePoint();
#
#     _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: 60
; Schema: 0
               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %4 "main" %40 %51
               OpExecutionMode %4 OriginUpperLeft
               OpSource ESSL 310
               OpName %4 "main"
               OpName %9 "computePoint("
               OpName %12 "buf0"
               OpMemberName %12 0 "injectionSwitch"
               OpName %14 ""
               OpName %40 "gl_FragCoord"
               OpName %51 "_GLF_color"
               OpMemberDecorate %12 0 Offset 0
               OpDecorate %12 Block
               OpDecorate %14 DescriptorSet 0
               OpDecorate %14 Binding 0
               OpDecorate %40 BuiltIn FragCoord
               OpDecorate %51 Location 0
          %2 = OpTypeVoid
          %3 = OpTypeFunction %2
          %6 = OpTypeFloat 32
          %7 = OpTypeVector %6 3
          %8 = OpTypeFunction %7
         %11 = OpTypeVector %6 2
         %12 = OpTypeStruct %11
         %13 = OpTypePointer Uniform %12
         %14 = OpVariable %13 Uniform
         %15 = OpTypeInt 32 1
         %16 = OpConstant %15 0
         %17 = OpTypeInt 32 0
         %18 = OpConstant %17 0
         %19 = OpTypePointer Uniform %6
         %22 = OpConstant %17 1
         %25 = OpTypeBool
         %30 = OpConstant %6 1
         %31 = OpConstantComposite %7 %30 %30 %30
         %35 = OpConstantFalse %25
         %38 = OpTypeVector %6 4
         %39 = OpTypePointer Input %38
         %40 = OpVariable %39 Input
         %41 = OpTypePointer Input %6
         %44 = OpConstant %6 0
         %50 = OpTypePointer Output %38
         %51 = OpVariable %50 Output
         %52 = OpConstantComposite %38 %30 %44 %44 %30
         %57 = OpTypePointer Function %25
         %59 = OpConstantTrue %25
          %4 = OpFunction %2 None %3
          %5 = OpLabel
         %58 = OpVariable %57 Function %35
               OpBranch %54
         %54 = OpLabel
         %34 = OpFunctionCall %7 %9
               OpLoopMerge %53 %56 None
               OpBranch %37
         %37 = OpLabel
         %42 = OpAccessChain %41 %40 %18
         %43 = OpLoad %6 %42
         %45 = OpFOrdLessThan %25 %43 %44
               OpSelectionMerge %47 None
               OpBranchConditional %45 %46 %47
         %46 = OpLabel
               OpStore %58 %59
               OpBranch %53
         %47 = OpLabel
         %49 = OpFunctionCall %7 %9
               OpStore %51 %52
               OpStore %58 %59
               OpBranch %53
         %56 = OpLabel
               OpBranch %54
         %53 = OpLabel
               OpReturn
               OpFunctionEnd
          %9 = OpFunction %7 None %8
         %10 = OpLabel
         %20 = OpAccessChain %19 %14 %16 %18
         %21 = OpLoad %6 %20
         %23 = OpAccessChain %19 %14 %16 %22
         %24 = OpLoad %6 %23
         %26 = OpFOrdGreaterThan %25 %21 %24
               OpSelectionMerge %28 None
               OpBranchConditional %26 %27 %28
         %27 = OpLabel
               OpKill
         %28 = OpLabel
         %33 = OpUndef %7
               OpReturnValue %33
               OpFunctionEnd
END

# uniforms for variant

# injectionSwitch
BUFFER variant_injectionSwitch DATA_TYPE vec2<float> DATA
 0.0 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_injectionSwitch 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