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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 GraphicsFuzz.
19
20# Short description: A fragment shader that covers a specific instruction simplification 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# precision highp float;
29#
30# layout(location = 0) out vec4 _GLF_color;
31# layout(set = 0, binding = 0) uniform buf0
32# {
33#     float one;
34# };
35#
36# void main()
37# {
38#     // Always selects 1.0.
39#     float f = mix(1.0, 0.0, gl_FragCoord.y < 0.0);
40#
41#     if(determinant(mat3(f)) == one)
42#         _GLF_color = vec4(1, 0, 0, 1);
43#     else
44#         _GLF_color = vec4(0);
45# }
46SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0
47; SPIR-V
48; Version: 1.0
49; Generator: Khronos Glslang Reference Front End; 8
50; Bound: 46
51; Schema: 0
52               OpCapability Shader
53          %1 = OpExtInstImport "GLSL.std.450"
54               OpMemoryModel Logical GLSL450
55               OpEntryPoint Fragment %4 "main" %13 %42
56               OpExecutionMode %4 OriginUpperLeft
57               OpSource ESSL 310
58               OpName %4 "main"
59               OpName %8 "f"
60               OpName %13 "gl_FragCoord"
61               OpName %30 "buf0"
62               OpMemberName %30 0 "one"
63               OpName %32 ""
64               OpName %42 "_GLF_color"
65               OpDecorate %13 BuiltIn FragCoord
66               OpMemberDecorate %30 0 Offset 0
67               OpDecorate %30 Block
68               OpDecorate %32 DescriptorSet 0
69               OpDecorate %32 Binding 0
70               OpDecorate %42 Location 0
71          %2 = OpTypeVoid
72          %3 = OpTypeFunction %2
73          %6 = OpTypeFloat 32
74          %7 = OpTypePointer Function %6
75          %9 = OpConstant %6 1
76         %10 = OpConstant %6 0
77         %11 = OpTypeVector %6 4
78         %12 = OpTypePointer Input %11
79         %13 = OpVariable %12 Input
80         %14 = OpTypeInt 32 0
81         %15 = OpConstant %14 1
82         %16 = OpTypePointer Input %6
83         %19 = OpTypeBool
84         %23 = OpTypeVector %6 3
85         %24 = OpTypeMatrix %23 3
86         %30 = OpTypeStruct %6
87         %31 = OpTypePointer Uniform %30
88         %32 = OpVariable %31 Uniform
89         %33 = OpTypeInt 32 1
90         %34 = OpConstant %33 0
91         %35 = OpTypePointer Uniform %6
92         %41 = OpTypePointer Output %11
93         %42 = OpVariable %41 Output
94         %43 = OpConstantComposite %11 %9 %10 %10 %9
95         %45 = OpConstantComposite %11 %10 %10 %10 %10
96          %4 = OpFunction %2 None %3
97          %5 = OpLabel
98          %8 = OpVariable %7 Function
99         %17 = OpAccessChain %16 %13 %15
100         %18 = OpLoad %6 %17
101         %20 = OpFOrdLessThan %19 %18 %10
102         %21 = OpSelect %6 %20 %10 %9
103               OpStore %8 %21
104         %22 = OpLoad %6 %8
105         %25 = OpCompositeConstruct %23 %22 %10 %10
106         %26 = OpCompositeConstruct %23 %10 %22 %10
107         %27 = OpCompositeConstruct %23 %10 %10 %22
108         %28 = OpCompositeConstruct %24 %25 %26 %27
109         %29 = OpExtInst %6 %1 Determinant %28
110         %36 = OpAccessChain %35 %32 %34
111         %37 = OpLoad %6 %36
112         %38 = OpFOrdEqual %19 %29 %37
113               OpSelectionMerge %40 None
114               OpBranchConditional %38 %39 %44
115         %39 = OpLabel
116               OpStore %42 %43
117               OpBranch %40
118         %44 = OpLabel
119               OpStore %42 %45
120               OpBranch %40
121         %40 = OpLabel
122               OpReturn
123               OpFunctionEnd
124END
125
126# uniforms for variant
127
128# one
129BUFFER variant_one DATA_TYPE float DATA
130 1.0
131END
132
133BUFFER variant_framebuffer FORMAT B8G8R8A8_UNORM
134
135PIPELINE graphics variant_pipeline
136  ATTACH variant_vertex_shader
137  ATTACH variant_fragment_shader
138  FRAMEBUFFER_SIZE 256 256
139  BIND BUFFER variant_framebuffer AS color LOCATION 0
140  BIND BUFFER variant_one AS uniform DESCRIPTOR_SET 0 BINDING 0
141END
142CLEAR_COLOR variant_pipeline 0 0 0 255
143
144CLEAR variant_pipeline
145RUN variant_pipeline DRAW_RECT POS 0 0 SIZE 256 256
146
147EXPECT variant_framebuffer IDX 0 0 SIZE 256 256 EQ_RGBA 255 0 0 255
148