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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 vector log2 and cosh code 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#     vec2 v = log2(cosh(vec2(1, 100)));
35#
36#     if (v.x < v.y)
37#         _GLF_color = vec4(1, 0, 0, 1);
38#     else
39#         _GLF_color = vec4(0);
40# }
41SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0
42; SPIR-V
43; Version: 1.0
44; Generator: Khronos Glslang Reference Front End; 8
45; Bound: 34
46; Schema: 0
47               OpCapability Shader
48          %1 = OpExtInstImport "GLSL.std.450"
49               OpMemoryModel Logical GLSL450
50               OpEntryPoint Fragment %4 "main" %29
51               OpExecutionMode %4 OriginUpperLeft
52               OpSource ESSL 310
53               OpName %4 "main"
54               OpName %9 "v"
55               OpName %29 "_GLF_color"
56               OpDecorate %29 Location 0
57          %2 = OpTypeVoid
58          %3 = OpTypeFunction %2
59          %6 = OpTypeFloat 32
60          %7 = OpTypeVector %6 2
61          %8 = OpTypePointer Function %7
62         %10 = OpConstant %6 1
63         %11 = OpConstant %6 100
64         %12 = OpConstantComposite %7 %10 %11
65         %15 = OpTypeInt 32 0
66         %16 = OpConstant %15 0
67         %17 = OpTypePointer Function %6
68         %20 = OpConstant %15 1
69         %23 = OpTypeBool
70         %27 = OpTypeVector %6 4
71         %28 = OpTypePointer Output %27
72         %29 = OpVariable %28 Output
73         %30 = OpConstant %6 0
74         %31 = OpConstantComposite %27 %10 %30 %30 %10
75         %33 = OpConstantComposite %27 %30 %30 %30 %30
76          %4 = OpFunction %2 None %3
77          %5 = OpLabel
78          %9 = OpVariable %8 Function
79         %13 = OpExtInst %7 %1 Cosh %12
80         %14 = OpExtInst %7 %1 Log2 %13
81               OpStore %9 %14
82         %18 = OpAccessChain %17 %9 %16
83         %19 = OpLoad %6 %18
84         %21 = OpAccessChain %17 %9 %20
85         %22 = OpLoad %6 %21
86         %24 = OpFOrdLessThan %23 %19 %22
87               OpSelectionMerge %26 None
88               OpBranchConditional %24 %25 %32
89         %25 = OpLabel
90               OpStore %29 %31
91               OpBranch %26
92         %32 = OpLabel
93               OpStore %29 %33
94               OpBranch %26
95         %26 = OpLabel
96               OpReturn
97               OpFunctionEnd
98END
99
100
101BUFFER variant_framebuffer FORMAT B8G8R8A8_UNORM
102
103PIPELINE graphics variant_pipeline
104  ATTACH variant_vertex_shader
105  ATTACH variant_fragment_shader
106  FRAMEBUFFER_SIZE 256 256
107  BIND BUFFER variant_framebuffer AS color LOCATION 0
108END
109CLEAR_COLOR variant_pipeline 0 0 0 255
110
111CLEAR variant_pipeline
112RUN variant_pipeline DRAW_RECT POS 0 0 SIZE 256 256
113
114EXPECT variant_framebuffer IDX 0 0 SIZE 256 256 EQ_RGBA 255 0 0 255
115