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 code 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#
30# layout(location = 0) out vec4 _GLF_color;
31#
32# void main()
33# {
34#     // Constant vector doesn't change between fragments.
35#     vec4 diff = dFdy(acosh(vec4(8.0, 2.0, 3.5, 3.4)));
36#
37#     if (diff == vec4(0))
38#         _GLF_color = vec4(1, 0, 0, 1);
39#     else
40#         _GLF_color = diff;
41# }
42SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0
43; SPIR-V
44; Version: 1.0
45; Generator: Khronos Glslang Reference Front End; 8
46; Bound: 32
47; Schema: 0
48               OpCapability Shader
49          %1 = OpExtInstImport "GLSL.std.450"
50               OpMemoryModel Logical GLSL450
51               OpEntryPoint Fragment %4 "main" %27
52               OpExecutionMode %4 OriginUpperLeft
53               OpSource ESSL 310
54               OpName %4 "main"
55               OpName %9 "diff"
56               OpName %27 "_GLF_color"
57               OpDecorate %27 Location 0
58          %2 = OpTypeVoid
59          %3 = OpTypeFunction %2
60          %6 = OpTypeFloat 32
61          %7 = OpTypeVector %6 4
62          %8 = OpTypePointer Function %7
63         %10 = OpConstant %6 8
64         %11 = OpConstant %6 2
65         %12 = OpConstant %6 3.5
66         %13 = OpConstant %6 3.4000001
67         %14 = OpConstantComposite %7 %10 %11 %12 %13
68         %18 = OpConstant %6 0
69         %19 = OpConstantComposite %7 %18 %18 %18 %18
70         %20 = OpTypeBool
71         %21 = OpTypeVector %20 4
72         %26 = OpTypePointer Output %7
73         %27 = OpVariable %26 Output
74         %28 = OpConstant %6 1
75         %29 = OpConstantComposite %7 %28 %18 %18 %28
76          %4 = OpFunction %2 None %3
77          %5 = OpLabel
78          %9 = OpVariable %8 Function
79         %15 = OpExtInst %7 %1 Acosh %14
80         %16 = OpDPdy %7 %15
81               OpStore %9 %16
82         %17 = OpLoad %7 %9
83         %22 = OpFOrdEqual %21 %17 %19
84         %23 = OpAll %20 %22
85               OpSelectionMerge %25 None
86               OpBranchConditional %23 %24 %30
87         %24 = OpLabel
88               OpStore %27 %29
89               OpBranch %25
90         %30 = OpLabel
91         %31 = OpLoad %7 %9
92               OpStore %27 %31
93               OpBranch %25
94         %25 = 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