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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 the GraphicsFuzz project.
19
20# Short description: A fragment shader that covers a specific APFloat 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# #define _float_1_0 _GLF_uniform_float_values[0]
29#
30# precision highp float;
31#
32# // Contents of _GLF_uniform_float_values: 1.0
33# layout(set = 0, binding = 0) uniform buf0
34# {
35#     float _GLF_uniform_float_values[1];
36# };
37#
38# layout(location = 0) out vec4 _GLF_color;
39#
40# void main()
41# {
42#     vec2 v1 = vec2(_float_1_0);
43#     vec2 b = fract(v1);
44#
45#     // The values of the edges are the same, therefore this results in
46#     // an undefined value, but not in undefined behavior.
47#     float a = smoothstep(vec2(1.0), vec2(1.0), b).x;
48#
49#     _GLF_color = vec4(_float_1_0, a, a, _float_1_0);
50#
51#     // Always true.
52#     if (b.x < 1.0 && b.y < 1.0)
53#     {
54#         _GLF_color = vec4(_float_1_0, b.x, b.y, _float_1_0);
55#     }
56#     else
57#     {
58#         _GLF_color = vec4(_float_1_0);
59#     }
60# }
61SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0
62; SPIR-V
63; Version: 1.0
64; Generator: Khronos Glslang Reference Front End; 10
65; Bound: 68
66; Schema: 0
67               OpCapability Shader
68          %1 = OpExtInstImport "GLSL.std.450"
69               OpMemoryModel Logical GLSL450
70               OpEntryPoint Fragment %4 "main" %35
71               OpExecutionMode %4 OriginUpperLeft
72               OpSource ESSL 310
73               OpName %4 "main"
74               OpName %9 "v1"
75               OpName %13 "buf0"
76               OpMemberName %13 0 "_GLF_uniform_float_values"
77               OpName %15 ""
78               OpName %22 "b"
79               OpName %26 "a"
80               OpName %35 "_GLF_color"
81               OpDecorate %12 ArrayStride 16
82               OpMemberDecorate %13 0 Offset 0
83               OpDecorate %13 Block
84               OpDecorate %15 DescriptorSet 0
85               OpDecorate %15 Binding 0
86               OpDecorate %35 Location 0
87          %2 = OpTypeVoid
88          %3 = OpTypeFunction %2
89          %6 = OpTypeFloat 32
90          %7 = OpTypeVector %6 2
91          %8 = OpTypePointer Function %7
92         %10 = OpTypeInt 32 0
93         %11 = OpConstant %10 1
94         %12 = OpTypeArray %6 %11
95         %13 = OpTypeStruct %12
96         %14 = OpTypePointer Uniform %13
97         %15 = OpVariable %14 Uniform
98         %16 = OpTypeInt 32 1
99         %17 = OpConstant %16 0
100         %18 = OpTypePointer Uniform %6
101         %25 = OpTypePointer Function %6
102         %27 = OpConstant %6 1
103         %28 = OpConstantComposite %7 %27 %27
104         %31 = OpConstant %10 0
105         %33 = OpTypeVector %6 4
106         %34 = OpTypePointer Output %33
107         %35 = OpVariable %34 Output
108         %43 = OpTypeBool
109          %4 = OpFunction %2 None %3
110          %5 = OpLabel
111          %9 = OpVariable %8 Function
112         %22 = OpVariable %8 Function
113         %26 = OpVariable %25 Function
114         %19 = OpAccessChain %18 %15 %17 %17
115         %20 = OpLoad %6 %19
116         %21 = OpCompositeConstruct %7 %20 %20
117               OpStore %9 %21
118         %23 = OpLoad %7 %9
119         %24 = OpExtInst %7 %1 Fract %23
120               OpStore %22 %24
121         %29 = OpLoad %7 %22
122         %30 = OpExtInst %7 %1 SmoothStep %28 %28 %29
123         %32 = OpCompositeExtract %6 %30 0
124               OpStore %26 %32
125         %36 = OpAccessChain %18 %15 %17 %17
126         %37 = OpLoad %6 %36
127         %38 = OpLoad %6 %26
128         %39 = OpLoad %6 %26
129         %40 = OpAccessChain %18 %15 %17 %17
130         %41 = OpLoad %6 %40
131         %42 = OpCompositeConstruct %33 %37 %38 %39 %41
132               OpStore %35 %42
133         %44 = OpAccessChain %25 %22 %31
134         %45 = OpLoad %6 %44
135         %46 = OpFOrdLessThan %43 %45 %27
136               OpSelectionMerge %48 None
137               OpBranchConditional %46 %47 %48
138         %47 = OpLabel
139         %49 = OpAccessChain %25 %22 %11
140         %50 = OpLoad %6 %49
141         %51 = OpFOrdLessThan %43 %50 %27
142               OpBranch %48
143         %48 = OpLabel
144         %52 = OpPhi %43 %46 %5 %51 %47
145               OpSelectionMerge %54 None
146               OpBranchConditional %52 %53 %64
147         %53 = OpLabel
148         %55 = OpAccessChain %18 %15 %17 %17
149         %56 = OpLoad %6 %55
150         %57 = OpAccessChain %25 %22 %31
151         %58 = OpLoad %6 %57
152         %59 = OpAccessChain %25 %22 %11
153         %60 = OpLoad %6 %59
154         %61 = OpAccessChain %18 %15 %17 %17
155         %62 = OpLoad %6 %61
156         %63 = OpCompositeConstruct %33 %56 %58 %60 %62
157               OpStore %35 %63
158               OpBranch %54
159         %64 = OpLabel
160         %65 = OpAccessChain %18 %15 %17 %17
161         %66 = OpLoad %6 %65
162         %67 = OpCompositeConstruct %33 %66 %66 %66 %66
163               OpStore %35 %67
164               OpBranch %54
165         %54 = OpLabel
166               OpReturn
167               OpFunctionEnd
168END
169
170# uniforms for variant
171
172# _GLF_uniform_float_values
173BUFFER variant__GLF_uniform_float_values DATA_TYPE float[] STD140 DATA
174 1.0
175END
176
177BUFFER variant_framebuffer FORMAT B8G8R8A8_UNORM
178
179PIPELINE graphics variant_pipeline
180  ATTACH variant_vertex_shader
181  ATTACH variant_fragment_shader
182  FRAMEBUFFER_SIZE 256 256
183  BIND BUFFER variant_framebuffer AS color LOCATION 0
184  BIND BUFFER variant__GLF_uniform_float_values AS uniform DESCRIPTOR_SET 0 BINDING 0
185END
186CLEAR_COLOR variant_pipeline 0 0 0 255
187
188CLEAR variant_pipeline
189RUN variant_pipeline DRAW_RECT POS 0 0 SIZE 256 256
190
191EXPECT variant_framebuffer IDX 0 0 SIZE 256 256 EQ_RGBA 255 0 0 255
192