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(void)
33# {
34#     int i = 2;
35#
36#     do
37#     {
38#         i++;
39#     }
40#     while(gl_FragCoord.x >= 0.0 && false);
41#
42#     // If condition is always true.
43#     if (i == 3)
44#         _GLF_color = vec4(1, 0, 0, 1);
45#     else
46#         _GLF_color = vec4(0);
47# }
48SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0
49; SPIR-V
50; Version: 1.0
51; Generator: Khronos Glslang Reference Front End; 8
52; Bound: 42
53; Schema: 0
54               OpCapability Shader
55          %1 = OpExtInstImport "GLSL.std.450"
56               OpMemoryModel Logical GLSL450
57               OpEntryPoint Fragment %4 "main" %20 %37
58               OpExecutionMode %4 OriginUpperLeft
59               OpSource ESSL 310
60               OpName %4 "main"
61               OpName %8 "i"
62               OpName %20 "gl_FragCoord"
63               OpName %37 "_GLF_color"
64               OpDecorate %8 RelaxedPrecision
65               OpDecorate %14 RelaxedPrecision
66               OpDecorate %16 RelaxedPrecision
67               OpDecorate %20 BuiltIn FragCoord
68               OpDecorate %31 RelaxedPrecision
69               OpDecorate %37 Location 0
70          %2 = OpTypeVoid
71          %3 = OpTypeFunction %2
72          %6 = OpTypeInt 32 1
73          %7 = OpTypePointer Function %6
74          %9 = OpConstant %6 2
75         %15 = OpConstant %6 1
76         %17 = OpTypeFloat 32
77         %18 = OpTypeVector %17 4
78         %19 = OpTypePointer Input %18
79         %20 = OpVariable %19 Input
80         %21 = OpTypeInt 32 0
81         %22 = OpConstant %21 0
82         %23 = OpTypePointer Input %17
83         %26 = OpConstant %17 0
84         %27 = OpTypeBool
85         %29 = OpConstantFalse %27
86         %32 = OpConstant %6 3
87         %36 = OpTypePointer Output %18
88         %37 = OpVariable %36 Output
89         %38 = OpConstant %17 1
90         %39 = OpConstantComposite %18 %38 %26 %26 %38
91         %41 = OpConstantComposite %18 %26 %26 %26 %26
92          %4 = OpFunction %2 None %3
93          %5 = OpLabel
94          %8 = OpVariable %7 Function
95               OpStore %8 %9
96               OpBranch %10
97         %10 = OpLabel
98               OpLoopMerge %12 %13 None
99               OpBranch %11
100         %11 = OpLabel
101         %14 = OpLoad %6 %8
102         %16 = OpIAdd %6 %14 %15
103               OpStore %8 %16
104               OpBranch %13
105         %13 = OpLabel
106         %24 = OpAccessChain %23 %20 %22
107         %25 = OpLoad %17 %24
108         %28 = OpFOrdGreaterThanEqual %27 %25 %26
109         %30 = OpLogicalAnd %27 %28 %29
110               OpBranchConditional %30 %10 %12
111         %12 = OpLabel
112         %31 = OpLoad %6 %8
113         %33 = OpIEqual %27 %31 %32
114               OpSelectionMerge %35 None
115               OpBranchConditional %33 %34 %40
116         %34 = OpLabel
117               OpStore %37 %39
118               OpBranch %35
119         %40 = OpLabel
120               OpStore %37 %41
121               OpBranch %35
122         %35 = OpLabel
123               OpReturn
124               OpFunctionEnd
125END
126
127# uniforms for variant
128
129# resolution
130BUFFER variant_resolution DATA_TYPE vec2<float> DATA
131 256.0 256.0
132END
133
134BUFFER variant_framebuffer FORMAT B8G8R8A8_UNORM
135
136PIPELINE graphics variant_pipeline
137  ATTACH variant_vertex_shader
138  ATTACH variant_fragment_shader
139  FRAMEBUFFER_SIZE 256 256
140  BIND BUFFER variant_framebuffer AS color LOCATION 0
141  BIND BUFFER variant_resolution AS uniform DESCRIPTOR_SET 0 BINDING 0
142END
143CLEAR_COLOR variant_pipeline 0 0 0 255
144
145CLEAR variant_pipeline
146RUN variant_pipeline DRAW_RECT POS 0 0 SIZE 256 256
147
148EXPECT variant_framebuffer IDX 0 0 SIZE 256 256 EQ_RGBA 255 0 0 255
149