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