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