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# layout(location = 0) out vec4 _GLF_color;
31#
32# void main()
33# {
34#     int i = 5;
35#     // If condition is always false.
36#     if (i >> 1 != 2)
37#         _GLF_color = vec4(0);
38#     else
39#         _GLF_color = vec4(1, 0, 0, 1);
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: 27
46; Schema: 0
47               OpCapability Shader
48          %1 = OpExtInstImport "GLSL.std.450"
49               OpMemoryModel Logical GLSL450
50               OpEntryPoint Fragment %4 "main" %21
51               OpExecutionMode %4 OriginUpperLeft
52               OpSource ESSL 310
53               OpName %4 "main"
54               OpName %8 "i"
55               OpName %21 "_GLF_color"
56               OpDecorate %8 RelaxedPrecision
57               OpDecorate %10 RelaxedPrecision
58               OpDecorate %12 RelaxedPrecision
59               OpDecorate %21 Location 0
60          %2 = OpTypeVoid
61          %3 = OpTypeFunction %2
62          %6 = OpTypeInt 32 1
63          %7 = OpTypePointer Function %6
64          %9 = OpConstant %6 5
65         %11 = OpConstant %6 1
66         %13 = OpConstant %6 2
67         %14 = OpTypeBool
68         %18 = OpTypeFloat 32
69         %19 = OpTypeVector %18 4
70         %20 = OpTypePointer Output %19
71         %21 = OpVariable %20 Output
72         %22 = OpConstant %18 0
73         %23 = OpConstantComposite %19 %22 %22 %22 %22
74         %25 = OpConstant %18 1
75         %26 = OpConstantComposite %19 %25 %22 %22 %25
76          %4 = OpFunction %2 None %3
77          %5 = OpLabel
78          %8 = OpVariable %7 Function
79               OpStore %8 %9
80         %10 = OpLoad %6 %8
81         %12 = OpShiftRightArithmetic %6 %10 %11
82         %15 = OpINotEqual %14 %12 %13
83               OpSelectionMerge %17 None
84               OpBranchConditional %15 %16 %24
85         %16 = OpLabel
86               OpStore %21 %23
87               OpBranch %17
88         %24 = OpLabel
89               OpStore %21 %26
90               OpBranch %17
91         %17 = OpLabel
92               OpReturn
93               OpFunctionEnd
94END
95
96
97BUFFER variant_framebuffer FORMAT B8G8R8A8_UNORM
98
99PIPELINE graphics variant_pipeline
100  ATTACH variant_vertex_shader
101  ATTACH variant_fragment_shader
102  FRAMEBUFFER_SIZE 256 256
103  BIND BUFFER variant_framebuffer AS color LOCATION 0
104END
105CLEAR_COLOR variant_pipeline 0 0 0 255
106
107CLEAR variant_pipeline
108RUN variant_pipeline DRAW_RECT POS 0 0 SIZE 256 256
109
110EXPECT variant_framebuffer IDX 0 0 SIZE 256 256 EQ_RGBA 255 0 0 255
111