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(set = 0, binding = 0) uniform buf0
34 # layout(location = 0) out vec4 _GLF_color;
38 # float a = 2.0 / (1.0 / four);
39 # // If condition is always true.
40 # if (a > 7.9 && a < 8.1)
41 # _GLF_color = vec4(1, 0, 0, 1);
43 # _GLF_color = vec4(0);
45 SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0
48 ; Generator: Khronos Glslang Reference Front End; 8
52 %1 = OpExtInstImport "GLSL.std.450"
53 OpMemoryModel Logical GLSL450
54 OpEntryPoint Fragment %4 "main" %33
55 OpExecutionMode %4 OriginUpperLeft
60 OpMemberName %11 0 "four"
62 OpName %33 "_GLF_color"
63 OpMemberDecorate %11 0 Offset 0
65 OpDecorate %13 DescriptorSet 0
66 OpDecorate %13 Binding 0
67 OpDecorate %33 Location 0
69 %3 = OpTypeFunction %2
71 %7 = OpTypePointer Function %6
75 %12 = OpTypePointer Uniform %11
76 %13 = OpVariable %12 Uniform
78 %15 = OpConstant %14 0
79 %16 = OpTypePointer Uniform %6
80 %22 = OpConstant %6 7.9000001
82 %26 = OpConstant %6 8.10000038
83 %31 = OpTypeVector %6 4
84 %32 = OpTypePointer Output %31
85 %33 = OpVariable %32 Output
87 %35 = OpConstantComposite %31 %10 %34 %34 %10
88 %37 = OpConstantComposite %31 %34 %34 %34 %34
89 %4 = OpFunction %2 None %3
91 %8 = OpVariable %7 Function
92 %17 = OpAccessChain %16 %13 %15
94 %19 = OpFDiv %6 %10 %18
95 %20 = OpFDiv %6 %9 %19
98 %24 = OpFOrdGreaterThan %23 %21 %22
100 %27 = OpFOrdLessThan %23 %25 %26
101 %28 = OpLogicalAnd %23 %24 %27
102 OpSelectionMerge %30 None
103 OpBranchConditional %28 %29 %36
115 # uniforms for variant
118 BUFFER variant_four DATA_TYPE float DATA
122 BUFFER variant_framebuffer FORMAT B8G8R8A8_UNORM
124 PIPELINE graphics variant_pipeline
125 ATTACH variant_vertex_shader
126 ATTACH variant_fragment_shader
127 FRAMEBUFFER_SIZE 256 256
128 BIND BUFFER variant_framebuffer AS color LOCATION 0
129 BIND BUFFER variant_four AS uniform DESCRIPTOR_SET 0 BINDING 0
131 CLEAR_COLOR variant_pipeline 0 0 0 255
133 CLEAR variant_pipeline
134 RUN variant_pipeline DRAW_RECT POS 0 0 SIZE 256 256
136 EXPECT variant_framebuffer IDX 0 0 SIZE 256 256 EQ_RGBA 255 0 0 255