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
18# A test for a bug found by GraphicsFuzz.
19
20# Short description: Fragment shader with 1-iteration loop and smoothstep
21
22# The test passes because the loop exits immediately and red is written
23
24SHADER vertex variant_vertex_shader PASSTHROUGH
25
26# variant_fragment_shader is derived from the following GLSL:
27# #version 310 es
28# precision highp float;
29#
30# precision highp int;
31#
32# layout(location = 0) out vec4 _GLF_color;
33#
34# void main()
35# {
36#  while(true)
37#   {
38#    if(true)
39#     {
40#      break;
41#     }
42#    int GLF_live9r;
43#    vec2(1.0)[clamp(GLF_live9r, 0, 1)];
44#   }
45#  float g = 3.0;
46#  _GLF_color = vec4(smoothstep(0.0, 1.0, g), 0.0, 0.0, 1.0);
47# }
48SHADER fragment variant_fragment_shader SPIRV-ASM
49; SPIR-V
50; Version: 1.0
51; Generator: Khronos Glslang Reference Front End; 7
52; Bound: 37
53; Schema: 0
54               OpCapability Shader
55          %1 = OpExtInstImport "GLSL.std.450"
56               OpMemoryModel Logical GLSL450
57               OpEntryPoint Fragment %4 "main" %32
58               OpExecutionMode %4 OriginUpperLeft
59               OpSource ESSL 310
60               OpName %4 "main"
61               OpName %22 "GLF_live9r"
62               OpName %28 "g"
63               OpName %32 "_GLF_color"
64               OpDecorate %32 Location 0
65          %2 = OpTypeVoid
66          %3 = OpTypeFunction %2
67         %11 = OpTypeBool
68         %12 = OpConstantTrue %11
69         %16 = OpTypeFloat 32
70         %17 = OpTypeVector %16 2
71         %18 = OpConstant %16 1
72         %19 = OpConstantComposite %17 %18 %18
73         %20 = OpTypeInt 32 1
74         %21 = OpTypePointer Function %20
75         %24 = OpConstant %20 0
76         %25 = OpConstant %20 1
77         %27 = OpTypePointer Function %16
78         %29 = OpConstant %16 3
79         %30 = OpTypeVector %16 4
80         %31 = OpTypePointer Output %30
81         %32 = OpVariable %31 Output
82         %33 = OpConstant %16 0
83          %4 = OpFunction %2 None %3
84          %5 = OpLabel
85         %22 = OpVariable %21 Function
86         %28 = OpVariable %27 Function
87               OpBranch %6
88          %6 = OpLabel
89               OpLoopMerge %8 %9 None
90               OpBranch %10
91         %10 = OpLabel
92               OpBranchConditional %12 %7 %8
93          %7 = OpLabel
94               OpSelectionMerge %14 None
95               OpBranchConditional %12 %13 %14
96         %13 = OpLabel
97               OpBranch %8
98         %14 = OpLabel
99         %23 = OpLoad %20 %22
100         %26 = OpExtInst %20 %1 SClamp %23 %24 %25
101               OpBranch %9
102          %9 = OpLabel
103               OpBranch %6
104          %8 = OpLabel
105               OpStore %28 %29
106         %34 = OpLoad %16 %28
107         %35 = OpExtInst %16 %1 SmoothStep %33 %18 %34
108         %36 = OpCompositeConstruct %30 %35 %33 %33 %18
109               OpStore %32 %36
110               OpReturn
111               OpFunctionEnd
112END
113
114# uniforms for variant
115
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