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 instruction folding 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(location = 0) out vec4 _GLF_color;
31#
32# void main()
33# {
34#     bool b = false;
35#
36#     // A single loop with i = 1.
37#     for(int i = 1; i > 0; i--)
38#     {
39#         float a = 1.0 + float(i);
40#
41#         // If condition is always true.
42#         if(2.0 - a == 0.0)
43#             b = true;
44#     }
45#
46#     // If condition is always true.
47#     if (b)
48#         _GLF_color = vec4(1, 0, 0, 1);
49#     else
50#         _GLF_color = vec4(0);
51# }
52SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0
53; SPIR-V
54; Version: 1.0
55; Generator: Khronos Glslang Reference Front End; 8
56; Bound: 48
57; Schema: 0
58               OpCapability Shader
59          %1 = OpExtInstImport "GLSL.std.450"
60               OpMemoryModel Logical GLSL450
61               OpEntryPoint Fragment %4 "main" %44
62               OpExecutionMode %4 OriginUpperLeft
63               OpSource ESSL 310
64               OpName %4 "main"
65               OpName %8 "b"
66               OpName %12 "i"
67               OpName %24 "a"
68               OpName %44 "_GLF_color"
69               OpDecorate %12 RelaxedPrecision
70               OpDecorate %19 RelaxedPrecision
71               OpDecorate %26 RelaxedPrecision
72               OpDecorate %37 RelaxedPrecision
73               OpDecorate %38 RelaxedPrecision
74               OpDecorate %44 Location 0
75          %2 = OpTypeVoid
76          %3 = OpTypeFunction %2
77          %6 = OpTypeBool
78          %7 = OpTypePointer Function %6
79          %9 = OpConstantFalse %6
80         %10 = OpTypeInt 32 1
81         %11 = OpTypePointer Function %10
82         %13 = OpConstant %10 1
83         %20 = OpConstant %10 0
84         %22 = OpTypeFloat 32
85         %23 = OpTypePointer Function %22
86         %25 = OpConstant %22 1
87         %29 = OpConstant %22 2
88         %32 = OpConstant %22 0
89         %36 = OpConstantTrue %6
90         %42 = OpTypeVector %22 4
91         %43 = OpTypePointer Output %42
92         %44 = OpVariable %43 Output
93         %45 = OpConstantComposite %42 %25 %32 %32 %25
94         %47 = OpConstantComposite %42 %32 %32 %32 %32
95          %4 = OpFunction %2 None %3
96          %5 = OpLabel
97          %8 = OpVariable %7 Function
98         %12 = OpVariable %11 Function
99         %24 = OpVariable %23 Function
100               OpStore %8 %9
101               OpStore %12 %13
102               OpBranch %14
103         %14 = OpLabel
104               OpLoopMerge %16 %17 None
105               OpBranch %18
106         %18 = OpLabel
107         %19 = OpLoad %10 %12
108         %21 = OpSGreaterThan %6 %19 %20
109               OpBranchConditional %21 %15 %16
110         %15 = OpLabel
111         %26 = OpLoad %10 %12
112         %27 = OpConvertSToF %22 %26
113         %28 = OpFAdd %22 %25 %27
114               OpStore %24 %28
115         %30 = OpLoad %22 %24
116         %31 = OpFSub %22 %29 %30
117         %33 = OpFOrdEqual %6 %31 %32
118               OpSelectionMerge %35 None
119               OpBranchConditional %33 %34 %35
120         %34 = OpLabel
121               OpStore %8 %36
122               OpBranch %35
123         %35 = OpLabel
124               OpBranch %17
125         %17 = OpLabel
126         %37 = OpLoad %10 %12
127         %38 = OpISub %10 %37 %13
128               OpStore %12 %38
129               OpBranch %14
130         %16 = OpLabel
131         %39 = OpLoad %6 %8
132               OpSelectionMerge %41 None
133               OpBranchConditional %39 %40 %46
134         %40 = OpLabel
135               OpStore %44 %45
136               OpBranch %41
137         %46 = OpLabel
138               OpStore %44 %47
139               OpBranch %41
140         %41 = OpLabel
141               OpReturn
142               OpFunctionEnd
143END
144
145
146BUFFER variant_framebuffer FORMAT B8G8R8A8_UNORM
147
148PIPELINE graphics variant_pipeline
149  ATTACH variant_vertex_shader
150  ATTACH variant_fragment_shader
151  FRAMEBUFFER_SIZE 256 256
152  BIND BUFFER variant_framebuffer AS color LOCATION 0
153END
154CLEAR_COLOR variant_pipeline 0 0 0 255
155
156CLEAR variant_pipeline
157RUN variant_pipeline DRAW_RECT POS 0 0 SIZE 256 256
158
159EXPECT variant_framebuffer IDX 0 0 SIZE 256 256 EQ_RGBA 255 0 0 255
160