1#!amber
2
3# Copyright 2021 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 the GraphicsFuzz project.
19
20# Short description: A fragment shader that covers specific LLVM code paths
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 320 es
28#
29# precision highp int;
30# precision highp float;
31#
32# layout(location = 0) out vec4 _GLF_color;
33#
34# // Always returns (1, 0, 0, 1)
35# vec4 func()
36# {
37#     switch(0)
38#     {
39#         case 0:
40#             return vec4(1, 0, 0, 1);
41#         default:
42#             return vec4(0);
43#     }
44# }
45#
46# void main()
47# {
48#     _GLF_color = func();
49# }
50SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0
51; SPIR-V
52; Version: 1.0
53; Generator: Khronos Glslang Reference Front End; 10
54; Bound: 27
55; Schema: 0
56               OpCapability Shader
57          %1 = OpExtInstImport "GLSL.std.450"
58               OpMemoryModel Logical GLSL450
59               OpEntryPoint Fragment %4 "main" %25
60               OpExecutionMode %4 OriginUpperLeft
61               OpSource ESSL 320
62               OpName %4 "main"
63               OpName %9 "func("
64               OpName %25 "_GLF_color"
65               OpDecorate %25 Location 0
66          %2 = OpTypeVoid
67          %3 = OpTypeFunction %2
68          %6 = OpTypeFloat 32
69          %7 = OpTypeVector %6 4
70          %8 = OpTypeFunction %7
71         %11 = OpTypeInt 32 1
72         %12 = OpConstant %11 0
73         %16 = OpConstant %6 1
74         %17 = OpConstant %6 0
75         %18 = OpConstantComposite %7 %16 %17 %17 %16
76         %20 = OpConstantComposite %7 %17 %17 %17 %17
77         %24 = OpTypePointer Output %7
78         %25 = OpVariable %24 Output
79          %4 = OpFunction %2 None %3
80          %5 = OpLabel
81         %26 = OpFunctionCall %7 %9
82               OpStore %25 %26
83               OpReturn
84               OpFunctionEnd
85          %9 = OpFunction %7 None %8
86         %10 = OpLabel
87               OpSelectionMerge %15 None
88               OpSwitch %12 %14 0 %13
89         %14 = OpLabel
90               OpReturnValue %20
91         %13 = OpLabel
92               OpReturnValue %18
93         %15 = OpLabel
94               OpUnreachable
95               OpFunctionEnd
96END
97
98
99BUFFER variant_framebuffer FORMAT B8G8R8A8_UNORM
100
101PIPELINE graphics variant_pipeline
102  ATTACH variant_vertex_shader
103  ATTACH variant_fragment_shader
104  FRAMEBUFFER_SIZE 256 256
105  BIND BUFFER variant_framebuffer AS color LOCATION 0
106END
107CLEAR_COLOR variant_pipeline 0 0 0 255
108
109CLEAR variant_pipeline
110RUN variant_pipeline DRAW_RECT POS 0 0 SIZE 256 256
111
112EXPECT variant_framebuffer IDX 0 0 SIZE 256 256 EQ_RGBA 255 0 0 255
113