3 # Copyright 2019 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;
35 # // If condition is always false.
37 # _GLF_color = vec4(0);
39 # _GLF_color = vec4(1, 0, 0, 1);
41 SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0
44 ; Generator: Khronos Glslang Reference Front End; 8
48 %1 = OpExtInstImport "GLSL.std.450"
49 OpMemoryModel Logical GLSL450
50 OpEntryPoint Fragment %4 "main" %21
51 OpExecutionMode %4 OriginUpperLeft
55 OpName %21 "_GLF_color"
56 OpDecorate %8 RelaxedPrecision
57 OpDecorate %10 RelaxedPrecision
58 OpDecorate %12 RelaxedPrecision
59 OpDecorate %21 Location 0
61 %3 = OpTypeFunction %2
63 %7 = OpTypePointer Function %6
69 %19 = OpTypeVector %18 4
70 %20 = OpTypePointer Output %19
71 %21 = OpVariable %20 Output
72 %22 = OpConstant %18 0
73 %23 = OpConstantComposite %19 %22 %22 %22 %22
74 %25 = OpConstant %18 1
75 %26 = OpConstantComposite %19 %25 %22 %22 %25
76 %4 = OpFunction %2 None %3
78 %8 = OpVariable %7 Function
81 %12 = OpShiftRightArithmetic %6 %10 %11
82 %15 = OpINotEqual %14 %12 %13
83 OpSelectionMerge %17 None
84 OpBranchConditional %15 %16 %24
97 BUFFER variant_framebuffer FORMAT B8G8R8A8_UNORM
99 PIPELINE graphics variant_pipeline
100 ATTACH variant_vertex_shader
101 ATTACH variant_fragment_shader
102 FRAMEBUFFER_SIZE 256 256
103 BIND BUFFER variant_framebuffer AS color LOCATION 0
105 CLEAR_COLOR variant_pipeline 0 0 0 255
107 CLEAR variant_pipeline
108 RUN variant_pipeline DRAW_RECT POS 0 0 SIZE 256 256
110 EXPECT variant_framebuffer IDX 0 0 SIZE 256 256 EQ_RGBA 255 0 0 255