3 # Copyright 2020 Google LLC
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
9 # http://www.apache.org/licenses/LICENSE-2.0
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.
18 # A test for a coverage-gap found by GraphicsFuzz.
20 # Short description: A fragment shader that covers a specific instruction folding path.
22 # The test passes because shader always writes red.
24 SHADER vertex variant_vertex_shader PASSTHROUGH
26 # variant_fragment_shader is derived from the following GLSL:
28 # precision highp float;
30 # layout(location = 0) out vec4 _GLF_color;
31 # layout(set = 0, binding = 0) uniform buf0
38 # float f = 4.0 * (2.0 / one);
40 # // If condition is always true.
41 # if(f > 7.9 && f < 8.1)
42 # _GLF_color = vec4(1, 0, 0, 1);
44 # _GLF_color = vec4(0);
46 SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0
49 ; Generator: Khronos Glslang Reference Front End; 8
53 %1 = OpExtInstImport "GLSL.std.450"
54 OpMemoryModel Logical GLSL450
55 OpEntryPoint Fragment %4 "main" %33
56 OpExecutionMode %4 OriginUpperLeft
61 OpMemberName %11 0 "one"
63 OpName %33 "_GLF_color"
64 OpMemberDecorate %11 0 Offset 0
66 OpDecorate %13 DescriptorSet 0
67 OpDecorate %13 Binding 0
68 OpDecorate %33 Location 0
70 %3 = OpTypeFunction %2
72 %7 = OpTypePointer Function %6
76 %12 = OpTypePointer Uniform %11
77 %13 = OpVariable %12 Uniform
79 %15 = OpConstant %14 0
80 %16 = OpTypePointer Uniform %6
81 %22 = OpConstant %6 7.9000001
83 %26 = OpConstant %6 8.10000038
84 %31 = OpTypeVector %6 4
85 %32 = OpTypePointer Output %31
86 %33 = OpVariable %32 Output
89 %36 = OpConstantComposite %31 %34 %35 %35 %34
90 %38 = OpConstantComposite %31 %35 %35 %35 %35
91 %4 = OpFunction %2 None %3
93 %8 = OpVariable %7 Function
94 %17 = OpAccessChain %16 %13 %15
96 %19 = OpFDiv %6 %10 %18
97 %20 = OpFMul %6 %9 %19
100 %24 = OpFOrdGreaterThan %23 %21 %22
102 %27 = OpFOrdLessThan %23 %25 %26
103 %28 = OpLogicalAnd %23 %24 %27
104 OpSelectionMerge %30 None
105 OpBranchConditional %28 %29 %37
117 # uniforms for variant
120 BUFFER variant_one DATA_TYPE float DATA
124 BUFFER variant_framebuffer FORMAT B8G8R8A8_UNORM
126 PIPELINE graphics variant_pipeline
127 ATTACH variant_vertex_shader
128 ATTACH variant_fragment_shader
129 FRAMEBUFFER_SIZE 256 256
130 BIND BUFFER variant_framebuffer AS color LOCATION 0
131 BIND BUFFER variant_one AS uniform DESCRIPTOR_SET 0 BINDING 0
133 CLEAR_COLOR variant_pipeline 0 0 0 255
135 CLEAR variant_pipeline
136 RUN variant_pipeline DRAW_RECT POS 0 0 SIZE 256 256
138 EXPECT variant_framebuffer IDX 0 0 SIZE 256 256 EQ_RGBA 255 0 0 255