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2026-05-06 23:44:13 +02:00
parent a5f787d80f
commit fd7038b853
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+#!amber
+
+# Copyright 2019 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+# A test for a bug found by GraphicsFuzz.
+
+# Short description: A fragment shader that uses an uninitialized variable
+
+# The test passes because the shader always writes the color red.
+# The update to _GLF_color.x has no effect on visible pixels.
+
+SHADER vertex variant_vertex_shader PASSTHROUGH
+
+# variant_fragment_shader is derived from the following GLSL:
+# #version 310 es
+# precision highp float;
+#
+# layout(location = 0) out vec4 _GLF_color;
+#
+# void main()
+# {
+#     _GLF_color = vec4(1.0, 0.0, 0.0, 1.0);
+#
+#     uint foo;
+#
+#     // For visible pixels, this is equivalent to: _GLF_color.x = _GLF_color.x;
+#     _GLF_color.x = gl_FragCoord.x > -1.0 ? _GLF_color.x : float(178493u + (--foo));
+# }
+SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0
+; SPIR-V
+; Version: 1.0
+; Generator: Khronos Glslang Reference Front End; 7
+; Bound: 42
+; Schema: 0
+               OpCapability Shader
+          %1 = OpExtInstImport "GLSL.std.450"
+               OpMemoryModel Logical GLSL450
+               OpEntryPoint Fragment %4 "main" %9 %14
+               OpExecutionMode %4 OriginUpperLeft
+               OpSource ESSL 310
+               OpName %4 "main"
+               OpName %9 "_GLF_color"
+               OpName %14 "gl_FragCoord"
+               OpName %33 "foo"
+               OpDecorate %9 Location 0
+               OpDecorate %14 BuiltIn FragCoord
+               OpDecorate %33 RelaxedPrecision
+               OpDecorate %34 RelaxedPrecision
+               OpDecorate %37 RelaxedPrecision
+               OpDecorate %38 RelaxedPrecision
+          %2 = OpTypeVoid
+          %3 = OpTypeFunction %2
+          %6 = OpTypeFloat 32
+          %7 = OpTypeVector %6 4
+          %8 = OpTypePointer Output %7
+          %9 = OpVariable %8 Output
+         %10 = OpConstant %6 1
+         %11 = OpConstant %6 0
+         %12 = OpConstantComposite %7 %10 %11 %11 %10
+         %13 = OpTypePointer Input %7
+         %14 = OpVariable %13 Input
+         %15 = OpTypeInt 32 0
+         %16 = OpConstant %15 0
+         %17 = OpTypePointer Input %6
+         %20 = OpConstant %6 -1
+         %21 = OpTypeBool
+         %23 = OpTypePointer Function %6
+         %27 = OpTypePointer Output %6
+         %31 = OpConstant %15 178493
+         %32 = OpTypePointer Function %15
+         %35 = OpTypeInt 32 1
+         %36 = OpConstant %35 1
+          %4 = OpFunction %2 None %3
+          %5 = OpLabel
+         %24 = OpVariable %23 Function
+         %33 = OpVariable %32 Function
+               OpStore %9 %12
+         %18 = OpAccessChain %17 %14 %16
+         %19 = OpLoad %6 %18
+         %22 = OpFOrdGreaterThan %21 %19 %20
+               OpSelectionMerge %26 None
+               OpBranchConditional %22 %25 %30
+         %25 = OpLabel
+         %28 = OpAccessChain %27 %9 %16
+         %29 = OpLoad %6 %28
+               OpStore %24 %29
+               OpBranch %26
+         %30 = OpLabel
+         %34 = OpLoad %15 %33
+         %37 = OpISub %15 %34 %36
+               OpStore %33 %37
+         %38 = OpIAdd %15 %31 %37
+         %39 = OpConvertUToF %6 %38
+               OpStore %24 %39
+               OpBranch %26
+         %26 = OpLabel
+         %40 = OpLoad %6 %24
+         %41 = OpAccessChain %27 %9 %16
+               OpStore %41 %40
+               OpReturn
+               OpFunctionEnd
+END
+
+# uniforms for variant
+
+
+BUFFER variant_framebuffer FORMAT B8G8R8A8_UNORM
+
+PIPELINE graphics variant_pipeline
+  ATTACH variant_vertex_shader
+  ATTACH variant_fragment_shader
+  FRAMEBUFFER_SIZE 256 256
+  BIND BUFFER variant_framebuffer AS color LOCATION 0
+END
+CLEAR_COLOR variant_pipeline 0 0 0 255
+
+CLEAR variant_pipeline
+RUN variant_pipeline DRAW_RECT POS 0 0 SIZE 256 256
+
+EXPECT variant_framebuffer IDX 0 0 SIZE 256 256 EQ_RGBA 255 0 0 255