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 vector DCE 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# precision highp int;
30#
31# layout(location = 0) out vec4 _GLF_color;
32# layout(set = 0, binding = 0) uniform buf0
33# {
34#     int zero;
35# };
36#
37# void main()
38# {
39#     vec2 a = vec2(1);
40#
41#     if (zero == 1) // Always false.
42#         a.x += 1.0;
43#
44#     vec2 b = a.y + vec2(2, 3);
45#
46#     if (b == vec2(3, 4)) // Always true.
47#         _GLF_color = vec4(1, 0, 0, 1);
48#     else
49#         _GLF_color = vec4(0);
50# }
51SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0
52; SPIR-V
53; Version: 1.0
54; Generator: Khronos Glslang Reference Front End; 8
55; Bound: 56
56; Schema: 0
57               OpCapability Shader
58          %1 = OpExtInstImport "GLSL.std.450"
59               OpMemoryModel Logical GLSL450
60               OpEntryPoint Fragment %4 "main" %51
61               OpExecutionMode %4 OriginUpperLeft
62               OpSource ESSL 310
63               OpName %4 "main"
64               OpName %9 "a"
65               OpName %13 "buf0"
66               OpMemberName %13 0 "zero"
67               OpName %15 ""
68               OpName %32 "b"
69               OpName %51 "_GLF_color"
70               OpMemberDecorate %13 0 Offset 0
71               OpDecorate %13 Block
72               OpDecorate %15 DescriptorSet 0
73               OpDecorate %15 Binding 0
74               OpDecorate %51 Location 0
75          %2 = OpTypeVoid
76          %3 = OpTypeFunction %2
77          %6 = OpTypeFloat 32
78          %7 = OpTypeVector %6 2
79          %8 = OpTypePointer Function %7
80         %10 = OpConstant %6 1
81         %11 = OpConstantComposite %7 %10 %10
82         %12 = OpTypeInt 32 1
83         %13 = OpTypeStruct %12
84         %14 = OpTypePointer Uniform %13
85         %15 = OpVariable %14 Uniform
86         %16 = OpConstant %12 0
87         %17 = OpTypePointer Uniform %12
88         %20 = OpConstant %12 1
89         %21 = OpTypeBool
90         %25 = OpTypeInt 32 0
91         %26 = OpConstant %25 0
92         %27 = OpTypePointer Function %6
93         %33 = OpConstant %25 1
94         %36 = OpConstant %6 2
95         %37 = OpConstant %6 3
96         %38 = OpConstantComposite %7 %36 %37
97         %42 = OpConstant %6 4
98         %43 = OpConstantComposite %7 %37 %42
99         %44 = OpTypeVector %21 2
100         %49 = OpTypeVector %6 4
101         %50 = OpTypePointer Output %49
102         %51 = OpVariable %50 Output
103         %52 = OpConstant %6 0
104         %53 = OpConstantComposite %49 %10 %52 %52 %10
105         %55 = OpConstantComposite %49 %52 %52 %52 %52
106          %4 = OpFunction %2 None %3
107          %5 = OpLabel
108          %9 = OpVariable %8 Function
109         %32 = OpVariable %8 Function
110               OpStore %9 %11
111         %18 = OpAccessChain %17 %15 %16
112         %19 = OpLoad %12 %18
113         %22 = OpIEqual %21 %19 %20
114               OpSelectionMerge %24 None
115               OpBranchConditional %22 %23 %24
116         %23 = OpLabel
117         %28 = OpAccessChain %27 %9 %26
118         %29 = OpLoad %6 %28
119         %30 = OpFAdd %6 %29 %10
120         %31 = OpAccessChain %27 %9 %26
121               OpStore %31 %30
122               OpBranch %24
123         %24 = OpLabel
124         %34 = OpAccessChain %27 %9 %33
125         %35 = OpLoad %6 %34
126         %39 = OpCompositeConstruct %7 %35 %35
127         %40 = OpFAdd %7 %39 %38
128               OpStore %32 %40
129         %41 = OpLoad %7 %32
130         %45 = OpFOrdEqual %44 %41 %43
131         %46 = OpAll %21 %45
132               OpSelectionMerge %48 None
133               OpBranchConditional %46 %47 %54
134         %47 = OpLabel
135               OpStore %51 %53
136               OpBranch %48
137         %54 = OpLabel
138               OpStore %51 %55
139               OpBranch %48
140         %48 = OpLabel
141               OpReturn
142               OpFunctionEnd
143END
144
145# uniforms for variant
146
147# zero
148BUFFER variant_zero DATA_TYPE int32 DATA
149 0
150END
151
152BUFFER variant_framebuffer FORMAT B8G8R8A8_UNORM
153
154PIPELINE graphics variant_pipeline
155  ATTACH variant_vertex_shader
156  ATTACH variant_fragment_shader
157  FRAMEBUFFER_SIZE 256 256
158  BIND BUFFER variant_framebuffer AS color LOCATION 0
159  BIND BUFFER variant_zero AS uniform DESCRIPTOR_SET 0 BINDING 0
160END
161CLEAR_COLOR variant_pipeline 0 0 0 255
162
163CLEAR variant_pipeline
164RUN variant_pipeline DRAW_RECT POS 0 0 SIZE 256 256
165
166EXPECT variant_framebuffer IDX 0 0 SIZE 256 256 EQ_RGBA 255 0 0 255
167