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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 a = 6;
35#     int b = 5;
36#     // If condition is always false.
37#     if ((a ^ b) != 3)
38#         _GLF_color = vec4(0);
39#     else
40#         _GLF_color = vec4(1, 0, 0, 1);
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: 29
47; Schema: 0
48               OpCapability Shader
49          %1 = OpExtInstImport "GLSL.std.450"
50               OpMemoryModel Logical GLSL450
51               OpEntryPoint Fragment %4 "main" %23
52               OpExecutionMode %4 OriginUpperLeft
53               OpSource ESSL 310
54               OpName %4 "main"
55               OpName %8 "a"
56               OpName %10 "b"
57               OpName %23 "_GLF_color"
58               OpDecorate %8 RelaxedPrecision
59               OpDecorate %10 RelaxedPrecision
60               OpDecorate %12 RelaxedPrecision
61               OpDecorate %13 RelaxedPrecision
62               OpDecorate %14 RelaxedPrecision
63               OpDecorate %23 Location 0
64          %2 = OpTypeVoid
65          %3 = OpTypeFunction %2
66          %6 = OpTypeInt 32 1
67          %7 = OpTypePointer Function %6
68          %9 = OpConstant %6 6
69         %11 = OpConstant %6 5
70         %15 = OpConstant %6 3
71         %16 = OpTypeBool
72         %20 = OpTypeFloat 32
73         %21 = OpTypeVector %20 4
74         %22 = OpTypePointer Output %21
75         %23 = OpVariable %22 Output
76         %24 = OpConstant %20 0
77         %25 = OpConstantComposite %21 %24 %24 %24 %24
78         %27 = OpConstant %20 1
79         %28 = OpConstantComposite %21 %27 %24 %24 %27
80          %4 = OpFunction %2 None %3
81          %5 = OpLabel
82          %8 = OpVariable %7 Function
83         %10 = OpVariable %7 Function
84               OpStore %8 %9
85               OpStore %10 %11
86         %12 = OpLoad %6 %8
87         %13 = OpLoad %6 %10
88         %14 = OpBitwiseXor %6 %12 %13
89         %17 = OpINotEqual %16 %14 %15
90               OpSelectionMerge %19 None
91               OpBranchConditional %17 %18 %26
92         %18 = OpLabel
93               OpStore %23 %25
94               OpBranch %19
95         %26 = OpLabel
96               OpStore %23 %28
97               OpBranch %19
98         %19 = OpLabel
99               OpReturn
100               OpFunctionEnd
101END
102
103
104BUFFER variant_framebuffer FORMAT B8G8R8A8_UNORM
105
106PIPELINE graphics variant_pipeline
107  ATTACH variant_vertex_shader
108  ATTACH variant_fragment_shader
109  FRAMEBUFFER_SIZE 256 256
110  BIND BUFFER variant_framebuffer AS color LOCATION 0
111END
112CLEAR_COLOR variant_pipeline 0 0 0 255
113
114CLEAR variant_pipeline
115RUN variant_pipeline DRAW_RECT POS 0 0 SIZE 256 256
116
117EXPECT variant_framebuffer IDX 0 0 SIZE 256 256 EQ_RGBA 255 0 0 255
118