1#!amber
2
3# Copyright 2019 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# precision highp int;
31#
32# layout(location = 0) out vec4 _GLF_color;
33#
34# void main()
35# {
36#     bool a = false;
37#
38#     // If condition is always false.
39#     if(true && a)
40#         _GLF_color = vec4(0);
41#     else
42#         _GLF_color = vec4(1, 0, 0, 1);
43# }
44SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0
45; SPIR-V
46; Version: 1.0
47; Generator: Khronos Glslang Reference Front End; 8
48; Bound: 24
49; Schema: 0
50               OpCapability Shader
51          %1 = OpExtInstImport "GLSL.std.450"
52               OpMemoryModel Logical GLSL450
53               OpEntryPoint Fragment %4 "main" %18
54               OpExecutionMode %4 OriginUpperLeft
55               OpSource ESSL 310
56               OpName %4 "main"
57               OpName %8 "a"
58               OpName %18 "_GLF_color"
59               OpDecorate %18 Location 0
60          %2 = OpTypeVoid
61          %3 = OpTypeFunction %2
62          %6 = OpTypeBool
63          %7 = OpTypePointer Function %6
64          %9 = OpConstantFalse %6
65         %10 = OpConstantTrue %6
66         %15 = OpTypeFloat 32
67         %16 = OpTypeVector %15 4
68         %17 = OpTypePointer Output %16
69         %18 = OpVariable %17 Output
70         %19 = OpConstant %15 0
71         %20 = OpConstantComposite %16 %19 %19 %19 %19
72         %22 = OpConstant %15 1
73         %23 = OpConstantComposite %16 %22 %19 %19 %22
74          %4 = OpFunction %2 None %3
75          %5 = OpLabel
76          %8 = OpVariable %7 Function
77               OpStore %8 %9
78         %11 = OpLoad %6 %8
79         %12 = OpLogicalAnd %6 %10 %11
80               OpSelectionMerge %14 None
81               OpBranchConditional %12 %13 %21
82         %13 = OpLabel
83               OpStore %18 %20
84               OpBranch %14
85         %21 = OpLabel
86               OpStore %18 %23
87               OpBranch %14
88         %14 = OpLabel
89               OpReturn
90               OpFunctionEnd
91END
92
93
94BUFFER variant_framebuffer FORMAT B8G8R8A8_UNORM
95
96PIPELINE graphics variant_pipeline
97  ATTACH variant_vertex_shader
98  ATTACH variant_fragment_shader
99  FRAMEBUFFER_SIZE 256 256
100  BIND BUFFER variant_framebuffer AS color LOCATION 0
101END
102CLEAR_COLOR variant_pipeline 0 0 0 255
103
104CLEAR variant_pipeline
105RUN variant_pipeline DRAW_RECT POS 0 0 SIZE 256 256
106
107EXPECT variant_framebuffer IDX 0 0 SIZE 256 256 EQ_RGBA 255 0 0 255
108