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(set = 0, binding = 0) uniform buf0
31# {
32#     float four;
33# };
34# layout(location = 0) out vec4 _GLF_color;
35#
36# void main()
37# {
38#     float a = 2.0 / (1.0 / four);
39#     // If condition is always true.
40#     if (a > 7.9 && a < 8.1)
41#         _GLF_color = vec4(1, 0, 0, 1);
42#     else
43#         _GLF_color = vec4(0);
44# }
45SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0
46; SPIR-V
47; Version: 1.0
48; Generator: Khronos Glslang Reference Front End; 8
49; Bound: 38
50; Schema: 0
51               OpCapability Shader
52          %1 = OpExtInstImport "GLSL.std.450"
53               OpMemoryModel Logical GLSL450
54               OpEntryPoint Fragment %4 "main" %33
55               OpExecutionMode %4 OriginUpperLeft
56               OpSource ESSL 310
57               OpName %4 "main"
58               OpName %8 "a"
59               OpName %11 "buf0"
60               OpMemberName %11 0 "four"
61               OpName %13 ""
62               OpName %33 "_GLF_color"
63               OpMemberDecorate %11 0 Offset 0
64               OpDecorate %11 Block
65               OpDecorate %13 DescriptorSet 0
66               OpDecorate %13 Binding 0
67               OpDecorate %33 Location 0
68          %2 = OpTypeVoid
69          %3 = OpTypeFunction %2
70          %6 = OpTypeFloat 32
71          %7 = OpTypePointer Function %6
72          %9 = OpConstant %6 2
73         %10 = OpConstant %6 1
74         %11 = OpTypeStruct %6
75         %12 = OpTypePointer Uniform %11
76         %13 = OpVariable %12 Uniform
77         %14 = OpTypeInt 32 1
78         %15 = OpConstant %14 0
79         %16 = OpTypePointer Uniform %6
80         %22 = OpConstant %6 7.9000001
81         %23 = OpTypeBool
82         %26 = OpConstant %6 8.10000038
83         %31 = OpTypeVector %6 4
84         %32 = OpTypePointer Output %31
85         %33 = OpVariable %32 Output
86         %34 = OpConstant %6 0
87         %35 = OpConstantComposite %31 %10 %34 %34 %10
88         %37 = OpConstantComposite %31 %34 %34 %34 %34
89          %4 = OpFunction %2 None %3
90          %5 = OpLabel
91          %8 = OpVariable %7 Function
92         %17 = OpAccessChain %16 %13 %15
93         %18 = OpLoad %6 %17
94         %19 = OpFDiv %6 %10 %18
95         %20 = OpFDiv %6 %9 %19
96               OpStore %8 %20
97         %21 = OpLoad %6 %8
98         %24 = OpFOrdGreaterThan %23 %21 %22
99         %25 = OpLoad %6 %8
100         %27 = OpFOrdLessThan %23 %25 %26
101         %28 = OpLogicalAnd %23 %24 %27
102               OpSelectionMerge %30 None
103               OpBranchConditional %28 %29 %36
104         %29 = OpLabel
105               OpStore %33 %35
106               OpBranch %30
107         %36 = OpLabel
108               OpStore %33 %37
109               OpBranch %30
110         %30 = OpLabel
111               OpReturn
112               OpFunctionEnd
113END
114
115# uniforms for variant
116
117# four
118BUFFER variant_four DATA_TYPE float DATA
119 4.0
120END
121
122BUFFER variant_framebuffer FORMAT B8G8R8A8_UNORM
123
124PIPELINE graphics variant_pipeline
125  ATTACH variant_vertex_shader
126  ATTACH variant_fragment_shader
127  FRAMEBUFFER_SIZE 256 256
128  BIND BUFFER variant_framebuffer AS color LOCATION 0
129  BIND BUFFER variant_four AS uniform DESCRIPTOR_SET 0 BINDING 0
130END
131CLEAR_COLOR variant_pipeline 0 0 0 255
132
133CLEAR variant_pipeline
134RUN variant_pipeline DRAW_RECT POS 0 0 SIZE 256 256
135
136EXPECT variant_framebuffer IDX 0 0 SIZE 256 256 EQ_RGBA 255 0 0 255
137