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1#!amber
2
3# Copyright 2020 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 coverage-gap found by GraphicsFuzz.
19
20# Short description: A fragment shader that covers a specific LLVM analysis code path.
21
22# The test passes because shader always writes red.
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# precision highp int;
30#
31# layout(location = 0) out vec4 _GLF_color;
32#
33# layout(set = 0, binding = 0) uniform buf0
34# {
35#     int three;
36# };
37#
38# void main()
39# {
40#     int a = 0;
41#     for(int i = 0; i < 7 + three; i++)
42#     {
43#         switch(i)
44#         {
45#             case 7:
46#             case 8:
47#                 a++;
48#                 break;
49#         }
50#     }
51#
52#     if (a == 2) // Always true.
53#         _GLF_color = vec4(1, 0, 0, 1);
54#     else
55#         _GLF_color = vec4(0);
56# }
57SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0
58; SPIR-V
59; Version: 1.0
60; Generator: Khronos Glslang Reference Front End; 8
61; Bound: 51
62; Schema: 0
63               OpCapability Shader
64          %1 = OpExtInstImport "GLSL.std.450"
65               OpMemoryModel Logical GLSL450
66               OpEntryPoint Fragment %4 "main" %45
67               OpExecutionMode %4 OriginUpperLeft
68               OpSource ESSL 310
69               OpName %4 "main"
70               OpName %8 "a"
71               OpName %10 "i"
72               OpName %18 "buf0"
73               OpMemberName %18 0 "three"
74               OpName %20 ""
75               OpName %45 "_GLF_color"
76               OpMemberDecorate %18 0 Offset 0
77               OpDecorate %18 Block
78               OpDecorate %20 DescriptorSet 0
79               OpDecorate %20 Binding 0
80               OpDecorate %45 Location 0
81          %2 = OpTypeVoid
82          %3 = OpTypeFunction %2
83          %6 = OpTypeInt 32 1
84          %7 = OpTypePointer Function %6
85          %9 = OpConstant %6 0
86         %17 = OpConstant %6 7
87         %18 = OpTypeStruct %6
88         %19 = OpTypePointer Uniform %18
89         %20 = OpVariable %19 Uniform
90         %21 = OpTypePointer Uniform %6
91         %25 = OpTypeBool
92         %31 = OpConstant %6 1
93         %38 = OpConstant %6 2
94         %42 = OpTypeFloat 32
95         %43 = OpTypeVector %42 4
96         %44 = OpTypePointer Output %43
97         %45 = OpVariable %44 Output
98         %46 = OpConstant %42 1
99         %47 = OpConstant %42 0
100         %48 = OpConstantComposite %43 %46 %47 %47 %46
101         %50 = OpConstantComposite %43 %47 %47 %47 %47
102          %4 = OpFunction %2 None %3
103          %5 = OpLabel
104          %8 = OpVariable %7 Function
105         %10 = OpVariable %7 Function
106               OpStore %8 %9
107               OpStore %10 %9
108               OpBranch %11
109         %11 = OpLabel
110               OpLoopMerge %13 %14 None
111               OpBranch %15
112         %15 = OpLabel
113         %16 = OpLoad %6 %10
114         %22 = OpAccessChain %21 %20 %9
115         %23 = OpLoad %6 %22
116         %24 = OpIAdd %6 %17 %23
117         %26 = OpSLessThan %25 %16 %24
118               OpBranchConditional %26 %12 %13
119         %12 = OpLabel
120         %27 = OpLoad %6 %10
121               OpSelectionMerge %29 None
122               OpSwitch %27 %29 7 %28 8 %28
123         %28 = OpLabel
124         %30 = OpLoad %6 %8
125         %32 = OpIAdd %6 %30 %31
126               OpStore %8 %32
127               OpBranch %29
128         %29 = OpLabel
129               OpBranch %14
130         %14 = OpLabel
131         %35 = OpLoad %6 %10
132         %36 = OpIAdd %6 %35 %31
133               OpStore %10 %36
134               OpBranch %11
135         %13 = OpLabel
136         %37 = OpLoad %6 %8
137         %39 = OpIEqual %25 %37 %38
138               OpSelectionMerge %41 None
139               OpBranchConditional %39 %40 %49
140         %40 = OpLabel
141               OpStore %45 %48
142               OpBranch %41
143         %49 = OpLabel
144               OpStore %45 %50
145               OpBranch %41
146         %41 = OpLabel
147               OpReturn
148               OpFunctionEnd
149END
150
151# uniforms for variant
152
153# three
154BUFFER variant_three DATA_TYPE int32 DATA
155 3
156END
157
158BUFFER variant_framebuffer FORMAT B8G8R8A8_UNORM
159
160PIPELINE graphics variant_pipeline
161  ATTACH variant_vertex_shader
162  ATTACH variant_fragment_shader
163  FRAMEBUFFER_SIZE 256 256
164  BIND BUFFER variant_framebuffer AS color LOCATION 0
165  BIND BUFFER variant_three AS uniform DESCRIPTOR_SET 0 BINDING 0
166END
167CLEAR_COLOR variant_pipeline 0 0 0 255
168
169CLEAR variant_pipeline
170RUN variant_pipeline DRAW_RECT POS 0 0 SIZE 256 256
171
172EXPECT variant_framebuffer IDX 0 0 SIZE 256 256 EQ_RGBA 255 0 0 255
173