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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 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(location = 0) out vec4 _GLF_color;
31#
32# void main()
33# {
34#     uint a = 4u;
35#
36#     switch(a / 2u)
37#     {
38#         case 2u:
39#             // This branch is always executed.
40#             _GLF_color = vec4(1, 0, 0, 1);
41#             break;
42#         default:
43#             _GLF_color = vec4(0);
44#             break;
45#     }
46# }
47SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0
48; SPIR-V
49; Version: 1.0
50; Generator: Khronos Glslang Reference Front End; 8
51; Bound: 27
52; Schema: 0
53               OpCapability Shader
54          %1 = OpExtInstImport "GLSL.std.450"
55               OpMemoryModel Logical GLSL450
56               OpEntryPoint Fragment %4 "main" %19
57               OpExecutionMode %4 OriginUpperLeft
58               OpSource ESSL 310
59               OpName %4 "main"
60               OpName %8 "a"
61               OpName %19 "_GLF_color"
62               OpDecorate %8 RelaxedPrecision
63               OpDecorate %10 RelaxedPrecision
64               OpDecorate %12 RelaxedPrecision
65               OpDecorate %19 Location 0
66          %2 = OpTypeVoid
67          %3 = OpTypeFunction %2
68          %6 = OpTypeInt 32 0
69          %7 = OpTypePointer Function %6
70          %9 = OpConstant %6 4
71         %11 = OpConstant %6 2
72         %16 = OpTypeFloat 32
73         %17 = OpTypeVector %16 4
74         %18 = OpTypePointer Output %17
75         %19 = OpVariable %18 Output
76         %20 = OpConstant %16 1
77         %21 = OpConstant %16 0
78         %22 = OpConstantComposite %17 %20 %21 %21 %20
79         %24 = OpConstantComposite %17 %21 %21 %21 %21
80          %4 = OpFunction %2 None %3
81          %5 = OpLabel
82          %8 = OpVariable %7 Function
83               OpStore %8 %9
84         %10 = OpLoad %6 %8
85         %12 = OpUDiv %6 %10 %11
86               OpSelectionMerge %15 None
87               OpSwitch %12 %14 2 %13
88         %14 = OpLabel
89               OpStore %19 %24
90               OpBranch %15
91         %13 = OpLabel
92               OpStore %19 %22
93               OpBranch %15
94         %15 = OpLabel
95               OpReturn
96               OpFunctionEnd
97END
98
99
100BUFFER variant_framebuffer FORMAT B8G8R8A8_UNORM
101
102PIPELINE graphics variant_pipeline
103  ATTACH variant_vertex_shader
104  ATTACH variant_fragment_shader
105  FRAMEBUFFER_SIZE 256 256
106  BIND BUFFER variant_framebuffer AS color LOCATION 0
107END
108CLEAR_COLOR variant_pipeline 0 0 0 255
109
110CLEAR variant_pipeline
111RUN variant_pipeline DRAW_RECT POS 0 0 SIZE 256 256
112
113EXPECT variant_framebuffer IDX 0 0 SIZE 256 256 EQ_RGBA 255 0 0 255
114