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 single block elimination 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#
30# layout(set = 0, binding = 0) uniform buf0 {
31#     vec2 injectionSwitch;
32# };
33#
34# layout(location = 0) out vec4 _GLF_color;
35#
36# int g = 0;
37#
38# void main()
39# {
40#     while(g < int(injectionSwitch.x + 2.0)) {
41#         g++;
42#     }
43#
44#     // g is 2.
45#     int a = g;
46#
47#     // Always false.
48#     while(g < int(injectionSwitch.y)) {
49#         g++;
50#     }
51#
52#     a = a;
53#
54#     // Always true.
55#     if(a == 2)
56#         _GLF_color = vec4(1, 0, 0, 1);
57#     else
58#         _GLF_color = vec4(0);
59# }
60SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0
61; SPIR-V
62; Version: 1.0
63; Generator: Khronos Glslang Reference Front End; 8
64; Bound: 64
65; Schema: 0
66               OpCapability Shader
67          %1 = OpExtInstImport "GLSL.std.450"
68               OpMemoryModel Logical GLSL450
69               OpEntryPoint Fragment %4 "main" %58
70               OpExecutionMode %4 OriginUpperLeft
71               OpSource ESSL 310
72               OpName %4 "main"
73               OpName %8 "g"
74               OpName %18 "buf0"
75               OpMemberName %18 0 "injectionSwitch"
76               OpName %20 ""
77               OpName %35 "a"
78               OpName %58 "_GLF_color"
79               OpDecorate %8 RelaxedPrecision
80               OpDecorate %15 RelaxedPrecision
81               OpMemberDecorate %18 0 Offset 0
82               OpDecorate %18 Block
83               OpDecorate %20 DescriptorSet 0
84               OpDecorate %20 Binding 0
85               OpDecorate %31 RelaxedPrecision
86               OpDecorate %33 RelaxedPrecision
87               OpDecorate %35 RelaxedPrecision
88               OpDecorate %36 RelaxedPrecision
89               OpDecorate %42 RelaxedPrecision
90               OpDecorate %48 RelaxedPrecision
91               OpDecorate %49 RelaxedPrecision
92               OpDecorate %50 RelaxedPrecision
93               OpDecorate %51 RelaxedPrecision
94               OpDecorate %58 Location 0
95          %2 = OpTypeVoid
96          %3 = OpTypeFunction %2
97          %6 = OpTypeInt 32 1
98          %7 = OpTypePointer Private %6
99          %8 = OpVariable %7 Private
100          %9 = OpConstant %6 0
101         %16 = OpTypeFloat 32
102         %17 = OpTypeVector %16 2
103         %18 = OpTypeStruct %17
104         %19 = OpTypePointer Uniform %18
105         %20 = OpVariable %19 Uniform
106         %21 = OpTypeInt 32 0
107         %22 = OpConstant %21 0
108         %23 = OpTypePointer Uniform %16
109         %26 = OpConstant %16 2
110         %29 = OpTypeBool
111         %32 = OpConstant %6 1
112         %34 = OpTypePointer Function %6
113         %43 = OpConstant %21 1
114         %52 = OpConstant %6 2
115         %56 = OpTypeVector %16 4
116         %57 = OpTypePointer Output %56
117         %58 = OpVariable %57 Output
118         %59 = OpConstant %16 1
119         %60 = OpConstant %16 0
120         %61 = OpConstantComposite %56 %59 %60 %60 %59
121         %63 = OpConstantComposite %56 %60 %60 %60 %60
122          %4 = OpFunction %2 None %3
123          %5 = OpLabel
124         %35 = OpVariable %34 Function
125               OpStore %8 %9
126               OpBranch %10
127         %10 = OpLabel
128               OpLoopMerge %12 %13 None
129               OpBranch %14
130         %14 = OpLabel
131         %15 = OpLoad %6 %8
132         %24 = OpAccessChain %23 %20 %9 %22
133         %25 = OpLoad %16 %24
134         %27 = OpFAdd %16 %25 %26
135         %28 = OpConvertFToS %6 %27
136         %30 = OpSLessThan %29 %15 %28
137               OpBranchConditional %30 %11 %12
138         %11 = OpLabel
139         %31 = OpLoad %6 %8
140         %33 = OpIAdd %6 %31 %32
141               OpStore %8 %33
142               OpBranch %13
143         %13 = OpLabel
144               OpBranch %10
145         %12 = OpLabel
146         %36 = OpLoad %6 %8
147               OpStore %35 %36
148               OpBranch %37
149         %37 = OpLabel
150               OpLoopMerge %39 %40 None
151               OpBranch %41
152         %41 = OpLabel
153         %42 = OpLoad %6 %8
154         %44 = OpAccessChain %23 %20 %9 %43
155         %45 = OpLoad %16 %44
156         %46 = OpConvertFToS %6 %45
157         %47 = OpSLessThan %29 %42 %46
158               OpBranchConditional %47 %38 %39
159         %38 = OpLabel
160         %48 = OpLoad %6 %8
161         %49 = OpIAdd %6 %48 %32
162               OpStore %8 %49
163               OpBranch %40
164         %40 = OpLabel
165               OpBranch %37
166         %39 = OpLabel
167         %50 = OpLoad %6 %35
168               OpStore %35 %50
169         %51 = OpLoad %6 %35
170         %53 = OpIEqual %29 %51 %52
171               OpSelectionMerge %55 None
172               OpBranchConditional %53 %54 %62
173         %54 = OpLabel
174               OpStore %58 %61
175               OpBranch %55
176         %62 = OpLabel
177               OpStore %58 %63
178               OpBranch %55
179         %55 = OpLabel
180               OpReturn
181               OpFunctionEnd
182END
183
184# uniforms for variant
185
186# injectionSwitch
187BUFFER variant_injectionSwitch DATA_TYPE vec2<float> DATA
188 0.0 1.0
189END
190
191BUFFER variant_framebuffer FORMAT B8G8R8A8_UNORM
192
193PIPELINE graphics variant_pipeline
194  ATTACH variant_vertex_shader
195  ATTACH variant_fragment_shader
196  FRAMEBUFFER_SIZE 256 256
197  BIND BUFFER variant_framebuffer AS color LOCATION 0
198  BIND BUFFER variant_injectionSwitch AS uniform DESCRIPTOR_SET 0 BINDING 0
199END
200CLEAR_COLOR variant_pipeline 0 0 0 255
201
202CLEAR variant_pipeline
203RUN variant_pipeline DRAW_RECT POS 0 0 SIZE 256 256
204
205EXPECT variant_framebuffer IDX 0 0 SIZE 256 256 EQ_RGBA 255 0 0 255
206