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2026-05-06 23:44:13 +02:00
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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 with a for loop condition being always false
+
+# An always false condition is passed to a for loop inside a function. The test passes if red color is written after the for loop.
+
+# Optimized using spirv-opt with the following arguments:
+# '--eliminate-dead-branches'
+# '--merge-blocks'
+# '--vector-dce'
+# '--eliminate-dead-branches'
+# '--merge-blocks'
+# '--eliminate-dead-code-aggressive'
+# '--eliminate-local-single-block'
+# '--private-to-local'
+# '--convert-local-access-chains'
+# '--simplify-instructions'
+# '--eliminate-dead-inserts'
+# '--copy-propagate-arrays'
+# '--simplify-instructions'
+# '--eliminate-dead-code-aggressive'
+# '--eliminate-local-multi-store'
+# spirv-opt commit hash: 9559cdbdf011c487f67f89e2d694bd4a18d5c1e0
+
+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 color;
+#
+# vec3 drawShape(vec2 pos)
+# {
+#  bool c3;
+#  c3 = pos.y < 1.0;
+#  for(
+#      ivec2(8576, 72916);
+#      c3;
+#      bvec2(false, false)
+#  )
+#   {
+#    return vec3(1.0);
+#   }
+#  return vec3(1.0);
+# }
+# void main()
+# {
+#  drawShape(vec2(1.0));
+#  color = vec4(1, 0, 0, 1);
+# }
+SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0
+; SPIR-V
+; Version: 1.0
+; Generator: Khronos Glslang Reference Front End; 7
+; Bound: 52
+; Schema: 0
+               OpCapability Shader
+          %1 = OpExtInstImport "GLSL.std.450"
+               OpMemoryModel Logical GLSL450
+               OpEntryPoint Fragment %4 "main" %47
+               OpExecutionMode %4 OriginUpperLeft
+               OpSource ESSL 310
+               OpName %4 "main"
+               OpName %12 "drawShape(vf2;"
+               OpName %11 "pos"
+               OpName %16 "c3"
+               OpName %43 "param"
+               OpName %47 "color"
+               OpDecorate %47 Location 0
+          %2 = OpTypeVoid
+          %3 = OpTypeFunction %2
+          %6 = OpTypeFloat 32
+          %7 = OpTypeVector %6 2
+          %8 = OpTypePointer Function %7
+          %9 = OpTypeVector %6 3
+         %10 = OpTypeFunction %9 %8
+         %14 = OpTypeBool
+         %15 = OpTypePointer Function %14
+         %17 = OpTypeInt 32 0
+         %18 = OpConstant %17 1
+         %19 = OpTypePointer Function %6
+         %22 = OpConstant %6 1
+         %35 = OpConstantComposite %9 %22 %22 %22
+         %42 = OpConstantComposite %7 %22 %22
+         %45 = OpTypeVector %6 4
+         %46 = OpTypePointer Output %45
+         %47 = OpVariable %46 Output
+         %48 = OpConstant %6 0
+         %49 = OpConstantComposite %45 %22 %48 %48 %22
+         %51 = OpUndef %14
+          %4 = OpFunction %2 None %3
+          %5 = OpLabel
+         %43 = OpVariable %8 Function
+               OpStore %43 %42
+         %44 = OpFunctionCall %9 %12 %43
+               OpStore %47 %49
+               OpReturn
+               OpFunctionEnd
+         %12 = OpFunction %9 None %10
+         %11 = OpFunctionParameter %8
+         %13 = OpLabel
+         %16 = OpVariable %15 Function
+         %20 = OpAccessChain %19 %11 %18
+         %21 = OpLoad %6 %20
+         %23 = OpFOrdLessThan %14 %21 %22
+               OpStore %16 %23
+               OpBranch %29
+         %29 = OpLabel
+         %50 = OpPhi %14 %23 %13 %51 %32
+               OpLoopMerge %31 %32 None
+               OpBranchConditional %50 %30 %31
+         %30 = OpLabel
+               OpReturnValue %35
+         %32 = OpLabel
+               OpBranch %29
+         %31 = OpLabel
+               OpReturnValue %35
+               OpFunctionEnd
+END
+
+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