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 bug found by GraphicsFuzz.
20 # Short description: Fragment shader with 1-iteration loop and smoothstep
22 # The test passes because the loop exits immediately and red is written
24 SHADER vertex variant_vertex_shader PASSTHROUGH
26 # variant_fragment_shader is derived from the following GLSL:
28 # precision highp float;
30 # precision highp int;
32 # layout(location = 0) out vec4 _GLF_color;
43 # vec2(1.0)[clamp(GLF_live9r, 0, 1)];
46 # _GLF_color = vec4(smoothstep(0.0, 1.0, g), 0.0, 0.0, 1.0);
48 SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0
51 ; Generator: Khronos Glslang Reference Front End; 7
55 %1 = OpExtInstImport "GLSL.std.450"
56 OpMemoryModel Logical GLSL450
57 OpEntryPoint Fragment %4 "main" %32
58 OpExecutionMode %4 OriginUpperLeft
61 OpName %22 "GLF_live9r"
63 OpName %32 "_GLF_color"
64 OpDecorate %32 Location 0
66 %3 = OpTypeFunction %2
68 %12 = OpConstantTrue %11
70 %17 = OpTypeVector %16 2
71 %18 = OpConstant %16 1
72 %19 = OpConstantComposite %17 %18 %18
74 %21 = OpTypePointer Function %20
75 %24 = OpConstant %20 0
76 %25 = OpConstant %20 1
77 %27 = OpTypePointer Function %16
78 %29 = OpConstant %16 3
79 %30 = OpTypeVector %16 4
80 %31 = OpTypePointer Output %30
81 %32 = OpVariable %31 Output
82 %33 = OpConstant %16 0
83 %4 = OpFunction %2 None %3
85 %22 = OpVariable %21 Function
86 %28 = OpVariable %27 Function
89 OpLoopMerge %8 %9 None
92 OpBranchConditional %12 %7 %8
94 OpSelectionMerge %14 None
95 OpBranchConditional %12 %13 %14
100 %26 = OpExtInst %20 %1 SClamp %23 %24 %25
107 %35 = OpExtInst %16 %1 SmoothStep %33 %18 %34
108 %36 = OpCompositeConstruct %30 %35 %33 %33 %18
114 # uniforms for variant
117 BUFFER variant_framebuffer FORMAT B8G8R8A8_UNORM
119 PIPELINE graphics variant_pipeline
120 ATTACH variant_vertex_shader
121 ATTACH variant_fragment_shader
122 FRAMEBUFFER_SIZE 256 256
123 BIND BUFFER variant_framebuffer AS color LOCATION 0
125 CLEAR_COLOR variant_pipeline 0 0 0 255
127 CLEAR variant_pipeline
128 RUN variant_pipeline DRAW_RECT POS 0 0 SIZE 256 256
130 EXPECT variant_framebuffer IDX 0 0 SIZE 256 256 EQ_RGBA 255 0 0 255