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;
39 # // This branch is always executed.
40 # _GLF_color = vec4(1, 0, 0, 1);
43 # _GLF_color = vec4(0);
47 SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0
50 ; Generator: Khronos Glslang Reference Front End; 8
54 %1 = OpExtInstImport "GLSL.std.450"
55 OpMemoryModel Logical GLSL450
56 OpEntryPoint Fragment %4 "main" %19
57 OpExecutionMode %4 OriginUpperLeft
61 OpName %19 "_GLF_color"
62 OpDecorate %8 RelaxedPrecision
63 OpDecorate %10 RelaxedPrecision
64 OpDecorate %12 RelaxedPrecision
65 OpDecorate %19 Location 0
67 %3 = OpTypeFunction %2
69 %7 = OpTypePointer Function %6
73 %17 = OpTypeVector %16 4
74 %18 = OpTypePointer Output %17
75 %19 = OpVariable %18 Output
76 %20 = OpConstant %16 1
77 %21 = OpConstant %16 0
78 %22 = OpConstantComposite %17 %20 %21 %21 %20
79 %24 = OpConstantComposite %17 %21 %21 %21 %21
80 %4 = OpFunction %2 None %3
82 %8 = OpVariable %7 Function
85 %12 = OpUDiv %6 %10 %11
86 OpSelectionMerge %15 None
87 OpSwitch %12 %14 2 %13
100 BUFFER variant_framebuffer FORMAT B8G8R8A8_UNORM
102 PIPELINE graphics variant_pipeline
103 ATTACH variant_vertex_shader
104 ATTACH variant_fragment_shader
105 FRAMEBUFFER_SIZE 256 256
106 BIND BUFFER variant_framebuffer AS color LOCATION 0
108 CLEAR_COLOR variant_pipeline 0 0 0 255
110 CLEAR variant_pipeline
111 RUN variant_pipeline DRAW_RECT POS 0 0 SIZE 256 256
113 EXPECT variant_framebuffer IDX 0 0 SIZE 256 256 EQ_RGBA 255 0 0 255