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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 constant folding 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#
30# layout(location = 0) out vec4 _GLF_color;
31#
32# void main()
33# {
34#     float f = atan(1.0, tanh(1.0));
35#
36#     if (f > 0.91 && f < 0.93)
37#         _GLF_color = vec4(1, 0, 0, 1);
38#     else
39#         _GLF_color = vec4(0);
40# }
41SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0
42; SPIR-V
43; Version: 1.0
44; Generator: Khronos Glslang Reference Front End; 8
45; Bound: 29
46; Schema: 0
47               OpCapability Shader
48          %1 = OpExtInstImport "GLSL.std.450"
49               OpMemoryModel Logical GLSL450
50               OpEntryPoint Fragment %4 "main" %24
51               OpExecutionMode %4 OriginUpperLeft
52               OpSource ESSL 310
53               OpName %4 "main"
54               OpName %8 "f"
55               OpName %24 "_GLF_color"
56               OpDecorate %24 Location 0
57          %2 = OpTypeVoid
58          %3 = OpTypeFunction %2
59          %6 = OpTypeFloat 32
60          %7 = OpTypePointer Function %6
61          %9 = OpConstant %6 1
62         %13 = OpConstant %6 0.910000026
63         %14 = OpTypeBool
64         %17 = OpConstant %6 0.930000007
65         %22 = OpTypeVector %6 4
66         %23 = OpTypePointer Output %22
67         %24 = OpVariable %23 Output
68         %25 = OpConstant %6 0
69         %26 = OpConstantComposite %22 %9 %25 %25 %9
70         %28 = OpConstantComposite %22 %25 %25 %25 %25
71          %4 = OpFunction %2 None %3
72          %5 = OpLabel
73          %8 = OpVariable %7 Function
74         %10 = OpExtInst %6 %1 Tanh %9
75         %11 = OpExtInst %6 %1 Atan2 %9 %10
76               OpStore %8 %11
77         %12 = OpLoad %6 %8
78         %15 = OpFOrdGreaterThan %14 %12 %13
79         %16 = OpLoad %6 %8
80         %18 = OpFOrdLessThan %14 %16 %17
81         %19 = OpLogicalAnd %14 %15 %18
82               OpSelectionMerge %21 None
83               OpBranchConditional %19 %20 %27
84         %20 = OpLabel
85               OpStore %24 %26
86               OpBranch %21
87         %27 = OpLabel
88               OpStore %24 %28
89               OpBranch %21
90         %21 = OpLabel
91               OpReturn
92               OpFunctionEnd
93END
94
95
96BUFFER variant_framebuffer FORMAT B8G8R8A8_UNORM
97
98PIPELINE graphics variant_pipeline
99  ATTACH variant_vertex_shader
100  ATTACH variant_fragment_shader
101  FRAMEBUFFER_SIZE 256 256
102  BIND BUFFER variant_framebuffer AS color LOCATION 0
103END
104CLEAR_COLOR variant_pipeline 0 0 0 255
105
106CLEAR variant_pipeline
107RUN variant_pipeline DRAW_RECT POS 0 0 SIZE 256 256
108
109EXPECT variant_framebuffer IDX 0 0 SIZE 256 256 EQ_RGBA 255 0 0 255
110