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1#!amber
2
3# Copyright 2019 Google LLC
4#
5# Licensed under the Apache License, Version 2.0 (the "License");
6# you may not use this file except in compliance with the License.
7# You may obtain a copy of the License at
8#
9#     http://www.apache.org/licenses/LICENSE-2.0
10#
11# Unless required by applicable law or agreed to in writing, software
12# distributed under the License is distributed on an "AS IS" BASIS,
13# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14# See the License for the specific language governing permissions and
15# limitations under the License.
16
17# A test for a bug found by GraphicsFuzz.
18
19# Short description: A fragment shader with do-while loop in conditional nest
20
21# The test passes because the fragment shader writes red, and the
22# do-while loop is not dynamically reachable.
23
24# Derived from the following GLSL.
25
26# Fragment shader GLSL:
27# #version 310 es
28#
29# precision highp float;
30#
31# layout(location = 0) out vec4 _GLF_color;
32#
33# void main()
34# {
35#  _GLF_color = vec4(1.0, 0.0, 0.0, 1.0);
36#  if(true)
37#   {
38#    if(gl_FragCoord.x < 0.0)
39#     {
40#      do
41#       {
42#        _GLF_color = vec4(1.0, 0.0, 0.0, 1.0);
43#       }
44#      while(gl_FragCoord.x < 0.0);
45#     }
46#   }
47# }
48
49SHADER vertex variant_vertex_shader PASSTHROUGH
50
51SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0
52; SPIR-V
53; Version: 1.0
54; Generator: Khronos Glslang Reference Front End; 7
55; Bound: 34
56; Schema: 0
57               OpCapability Shader
58          %1 = OpExtInstImport "GLSL.std.450"
59               OpMemoryModel Logical GLSL450
60               OpEntryPoint Fragment %4 "main" %9 %18
61               OpExecutionMode %4 OriginUpperLeft
62               OpSource ESSL 310
63               OpName %4 "main"
64               OpName %9 "_GLF_color"
65               OpName %18 "gl_FragCoord"
66               OpDecorate %9 Location 0
67               OpDecorate %18 BuiltIn FragCoord
68          %2 = OpTypeVoid
69          %3 = OpTypeFunction %2
70          %6 = OpTypeFloat 32
71          %7 = OpTypeVector %6 4
72          %8 = OpTypePointer Output %7
73          %9 = OpVariable %8 Output
74         %10 = OpConstant %6 1
75         %11 = OpConstant %6 0
76         %12 = OpConstantComposite %7 %10 %11 %11 %10
77         %13 = OpTypeBool
78         %14 = OpConstantTrue %13
79         %17 = OpTypePointer Input %7
80         %18 = OpVariable %17 Input
81         %19 = OpTypeInt 32 0
82         %20 = OpConstant %19 0
83         %21 = OpTypePointer Input %6
84          %4 = OpFunction %2 None %3
85          %5 = OpLabel
86               OpStore %9 %12
87               OpSelectionMerge %16 None
88               OpBranchConditional %14 %15 %16
89         %15 = OpLabel
90         %22 = OpAccessChain %21 %18 %20
91         %23 = OpLoad %6 %22
92         %24 = OpFOrdLessThan %13 %23 %11
93               OpSelectionMerge %26 None
94               OpBranchConditional %24 %25 %26
95         %25 = OpLabel
96               OpBranch %27
97         %27 = OpLabel
98               OpLoopMerge %29 %30 None
99               OpBranch %28
100         %28 = OpLabel
101               OpStore %9 %12
102               OpBranch %30
103         %30 = OpLabel
104         %31 = OpAccessChain %21 %18 %20
105         %32 = OpLoad %6 %31
106         %33 = OpFOrdLessThan %13 %32 %11
107               OpBranchConditional %33 %27 %29
108         %29 = OpLabel
109               OpBranch %26
110         %26 = OpLabel
111               OpBranch %16
112         %16 = OpLabel
113               OpReturn
114               OpFunctionEnd
115END
116
117BUFFER variant_framebuffer FORMAT B8G8R8A8_UNORM
118
119PIPELINE graphics variant_pipeline
120  ATTACH variant_vertex_shader
121  ATTACH variant_fragment_shader
122  FRAMEBUFFER_SIZE 256 256
123  BIND BUFFER variant_framebuffer AS color LOCATION 0
124END
125CLEAR_COLOR variant_pipeline 0 0 0 255
126
127CLEAR variant_pipeline
128RUN variant_pipeline DRAW_RECT POS 0 0 SIZE 256 256
129
130EXPECT variant_framebuffer IDX 0 0 SIZE 256 256 EQ_RGBA 255 0 0 255
131