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 simplification code path
21
22# The test passes because the 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# layout(set = 0, binding = 0) uniform buf0
32# {
33#     float zero;
34# };
35#
36# void main()
37# {
38#     float f = gl_FragCoord.x;
39#
40#     // (1.0 / 0.0) -> Inf.
41#     // (Inf * 0.0) -> Nan.
42#     // So: f += Nan.
43#     f += (1.0 / 0.0) * 0.0;
44#
45#     // Doesn't matter if this is executed or not.
46#     if (5.0 / f == 0.0)
47#         f += 1.0;
48#
49#     if (isnan(f) || f != zero)
50#         f = 0.0;
51#
52#     // Always true.
53#     if (f == 0.0)
54#         _GLF_color = vec4(1, 0, 0, 1);
55#     else
56#         _GLF_color = vec4(0);
57# }
58SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0
59; SPIR-V
60; Version: 1.0
61; Generator: Khronos Glslang Reference Front End; 8
62; Bound: 58
63; Schema: 0
64               OpCapability Shader
65          %1 = OpExtInstImport "GLSL.std.450"
66               OpMemoryModel Logical GLSL450
67               OpEntryPoint Fragment %4 "main" %11 %54
68               OpExecutionMode %4 OriginUpperLeft
69               OpSource ESSL 310
70               OpName %4 "main"
71               OpName %8 "f"
72               OpName %11 "gl_FragCoord"
73               OpName %37 "buf0"
74               OpMemberName %37 0 "zero"
75               OpName %39 ""
76               OpName %54 "_GLF_color"
77               OpDecorate %11 BuiltIn FragCoord
78               OpMemberDecorate %37 0 Offset 0
79               OpDecorate %37 Block
80               OpDecorate %39 DescriptorSet 0
81               OpDecorate %39 Binding 0
82               OpDecorate %54 Location 0
83          %2 = OpTypeVoid
84          %3 = OpTypeFunction %2
85          %6 = OpTypeFloat 32
86          %7 = OpTypePointer Function %6
87          %9 = OpTypeVector %6 4
88         %10 = OpTypePointer Input %9
89         %11 = OpVariable %10 Input
90         %12 = OpTypeInt 32 0
91         %13 = OpConstant %12 0
92         %14 = OpTypePointer Input %6
93         %17 = OpConstant %6 -0x1.8p+128
94         %20 = OpConstant %6 5
95         %23 = OpConstant %6 0
96         %24 = OpTypeBool
97         %28 = OpConstant %6 1
98         %37 = OpTypeStruct %6
99         %38 = OpTypePointer Uniform %37
100         %39 = OpVariable %38 Uniform
101         %40 = OpTypeInt 32 1
102         %41 = OpConstant %40 0
103         %42 = OpTypePointer Uniform %6
104         %53 = OpTypePointer Output %9
105         %54 = OpVariable %53 Output
106         %55 = OpConstantComposite %9 %28 %23 %23 %28
107         %57 = OpConstantComposite %9 %23 %23 %23 %23
108          %4 = OpFunction %2 None %3
109          %5 = OpLabel
110          %8 = OpVariable %7 Function
111         %15 = OpAccessChain %14 %11 %13
112         %16 = OpLoad %6 %15
113               OpStore %8 %16
114         %18 = OpLoad %6 %8
115         %19 = OpFAdd %6 %18 %17
116               OpStore %8 %19
117         %21 = OpLoad %6 %8
118         %22 = OpFDiv %6 %20 %21
119         %25 = OpFOrdEqual %24 %22 %23
120               OpSelectionMerge %27 None
121               OpBranchConditional %25 %26 %27
122         %26 = OpLabel
123         %29 = OpLoad %6 %8
124         %30 = OpFAdd %6 %29 %28
125               OpStore %8 %30
126               OpBranch %27
127         %27 = OpLabel
128         %31 = OpLoad %6 %8
129         %32 = OpIsNan %24 %31
130         %33 = OpLogicalNot %24 %32
131               OpSelectionMerge %35 None
132               OpBranchConditional %33 %34 %35
133         %34 = OpLabel
134         %36 = OpLoad %6 %8
135         %43 = OpAccessChain %42 %39 %41
136         %44 = OpLoad %6 %43
137         %45 = OpFOrdNotEqual %24 %36 %44
138               OpBranch %35
139         %35 = OpLabel
140         %46 = OpPhi %24 %32 %27 %45 %34
141               OpSelectionMerge %48 None
142               OpBranchConditional %46 %47 %48
143         %47 = OpLabel
144               OpStore %8 %23
145               OpBranch %48
146         %48 = OpLabel
147         %49 = OpLoad %6 %8
148         %50 = OpFOrdEqual %24 %49 %23
149               OpSelectionMerge %52 None
150               OpBranchConditional %50 %51 %56
151         %51 = OpLabel
152               OpStore %54 %55
153               OpBranch %52
154         %56 = OpLabel
155               OpStore %54 %57
156               OpBranch %52
157         %52 = OpLabel
158               OpReturn
159               OpFunctionEnd
160END
161
162# uniforms for variant
163
164# zero
165BUFFER variant_zero DATA_TYPE float DATA
166 0.0
167END
168
169BUFFER variant_framebuffer FORMAT B8G8R8A8_UNORM
170
171PIPELINE graphics variant_pipeline
172  ATTACH variant_vertex_shader
173  ATTACH variant_fragment_shader
174  FRAMEBUFFER_SIZE 256 256
175  BIND BUFFER variant_framebuffer AS color LOCATION 0
176  BIND BUFFER variant_zero AS uniform DESCRIPTOR_SET 0 BINDING 0
177END
178CLEAR_COLOR variant_pipeline 0 0 0 255
179
180CLEAR variant_pipeline
181RUN variant_pipeline DRAW_RECT POS 0 0 SIZE 256 256
182
183EXPECT variant_framebuffer IDX 0 0 SIZE 256 256 EQ_RGBA 255 0 0 255
184