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;
42 # // If condition is always true.
44 # _GLF_color = vec4(1, 0, 0, 1);
46 # _GLF_color = vec4(0);
48 SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0
51 ; Generator: Khronos Glslang Reference Front End; 8
55 %1 = OpExtInstImport "GLSL.std.450"
56 OpMemoryModel Logical GLSL450
57 OpEntryPoint Fragment %4 "main" %33
58 OpExecutionMode %4 OriginUpperLeft
62 OpName %33 "_GLF_color"
63 OpDecorate %8 RelaxedPrecision
64 OpDecorate %15 RelaxedPrecision
65 OpDecorate %20 RelaxedPrecision
66 OpDecorate %21 RelaxedPrecision
67 OpDecorate %22 RelaxedPrecision
68 OpDecorate %24 RelaxedPrecision
69 OpDecorate %25 RelaxedPrecision
70 OpDecorate %33 Location 0
72 %3 = OpTypeFunction %2
74 %7 = OpTypePointer Function %6
80 %26 = OpConstant %6 -1
82 %31 = OpTypeVector %30 4
83 %32 = OpTypePointer Output %31
84 %33 = OpVariable %32 Output
85 %34 = OpConstant %30 1
86 %35 = OpConstant %30 0
87 %36 = OpConstantComposite %31 %34 %35 %35 %34
88 %38 = OpConstantComposite %31 %35 %35 %35 %35
89 %4 = OpFunction %2 None %3
91 %8 = OpVariable %7 Function
95 OpLoopMerge %12 %13 None
99 %18 = OpSGreaterThanEqual %17 %15 %16
100 OpBranchConditional %18 %11 %12
103 %21 = OpISub %6 %20 %19
106 %24 = OpIAdd %6 %22 %23
113 %27 = OpIEqual %17 %25 %26
114 OpSelectionMerge %29 None
115 OpBranchConditional %27 %28 %37
128 BUFFER variant_framebuffer FORMAT B8G8R8A8_UNORM
130 PIPELINE graphics variant_pipeline
131 ATTACH variant_vertex_shader
132 ATTACH variant_fragment_shader
133 FRAMEBUFFER_SIZE 256 256
134 BIND BUFFER variant_framebuffer AS color LOCATION 0
136 CLEAR_COLOR variant_pipeline 0 0 0 255
138 CLEAR variant_pipeline
139 RUN variant_pipeline DRAW_RECT POS 0 0 SIZE 256 256
141 EXPECT variant_framebuffer IDX 0 0 SIZE 256 256 EQ_RGBA 255 0 0 255