Hi all -
I’m converting Apple’s Swift Sample "Adopting Metal II: Designing and
Implementing a Real-World Metal Renderer” in Xcode 8 beta6 to the latest
UnsafeMutablePointer API for untyped memory access.
Changes are necessary in MetalView.swift (Apple hasn’t updated their sample
code for the latest beta yet…)
The Swift Compiler crashes (Segmentation Fault: 11) on the attempt:
// Grab a pointer to the constant buffer's data store
// Since we are using Swift, it is easier to cast the pointer to the
ShadowPass type to fill the constant buffer
// We need to make a copy of these so the block captures the correct
data
// let shadowPtr =
UnsafeMutablePointer<ShadowPass>(constantBufferForFrame.contents())
let shadowPtr = constantBufferForFrame.contents().bindMemory(to:
ShadowPass.self, capacity: MemoryLayout<ShadowPass>.size)
shadowPtr.pointee = shadowPassData[0]
//More Swift specific stuff - advance pointer and cast to MainPass
// let mainPtr = UnsafeMutablePointer<MainPass>(shadowPtr.advanced(by: 1))
// mainPtr.pointee = mainPassFrameData
let mainPtr : UnsafeMutablePointer<MainPass> = shadowPtr.advanced(by:
1).withMemoryRebound(to: MainPass.self, capacity: MemoryLayout<MainPass>.size) {
$0.pointee = mainPassFrameData
}
//Advance and cast to ObjectData
// var ptr = UnsafeMutablePointer<ObjectData>(mainPtr.advanced(by: 1))
var ptr : UnsafeMutablePointer<ObjectData> = mainPtr.advanced(by:
1).withMemoryRebound(to: ObjectData.self, capacity:
MemoryLayout<ObjectData>.size) {_ in
}
let shadowOffset = 0
let mainPassOffset = MemoryLayout<ShadowPass>.size + shadowOffset
let objectDataOffset = MemoryLayout<MainPass>.size + mainPassOffset
// Update position of all the objects
if multithreadedUpdate {
DispatchQueue.concurrentPerform(iterations: objectsToRender) { i in
let thisPtr = ptr.advanced(by: i)
_ = self.renderables[i].UpdateData(ptr, deltaTime: 1.0/60.0)
}
}
else {
for index in 0..<objectsToRender {
ptr = renderables[index].UpdateData(ptr, deltaTime: 1.0/60.0)
}
}
ptr = ptr.advanced(by: objectsToRender)
_ = groundPlane!.UpdateData(ptr, deltaTime: 1.0/60.0)
Any help is appreciated. I have the latest Xcode log handy if necessary.
Here’s a clip of the stack trace.
0 swift 0x000000010714a99d
PrintStackTraceSignalHandler(void*) + 45
1 swift 0x000000010714a3e6 SignalHandler(int) + 470
2 libsystem_platform.dylib 0x00007fff91461bba _sigtramp + 26
3 libsystem_platform.dylib 000000000000000000 _sigtramp + 1857676384
4 swift 0x00000001047207b3 (anonymous
namespace)::SILGenApply::visitExpr(swift::Expr*) + 51
5 swift 0x0000000104723ace (anonymous
namespace)::SILGenApply::visitApplyExpr(swift::ApplyExpr*) + 5182
6 swift 0x0000000104711cc1
prepareApplyExpr(swift::Lowering::SILGenFunction&, swift::Expr*) + 273
7 swift 0x00000001047624e7 swift::ASTVisitor<(anonymous
namespace)::RValueEmitter, swift::Lowering::RValue, void, void, void, void,
void, swift::Lowering::SGFContext>::visit(swift::Expr*,
swift::Lowering::SGFContext) + 103
8 swift 0x0000000104762313
swift::Lowering::SILGenFunction::emitExprInto(swift::Expr*,
swift::Lowering::Initialization*) + 195
9 swift 0x000000010474fbc3
swift::Lowering::SILGenFunction::emitPatternBinding(swift::PatternBindingDecl*,
unsigned int) + 195
10 swift 0x00000001047077bd
swift::ASTVisitor<swift::Lowering::SILGenFunction, void, void, void, void,
void, void>::visit(swift::Decl*) + 125
11 swift 0x00000001047c0019 swift::ASTVisitor<(anonymous
namespace)::StmtEmitter, void, void, void, void, void,
void>::visit(swift::Stmt*) + 4169
12 swift 0x00000001047809ba
swift::Lowering::SILGenFunction::emitFunction(swift::FuncDecl*) + 314
13 swift 0x00000001046fd775
swift::Lowering::SILGenModule::emitFunction(swift::FuncDecl*)::$_1::operator()(swift::SILFunction*)
const + 1877
14 swift 0x00000001046fc322
swift::Lowering::SILGenModule::emitFunction(swift::FuncDecl*) + 626
15 swift 0x00000001047c7007 (anonymous
namespace)::SILGenType::emitType() + 1271
16 swift 0x00000001047c6a9e
swift::Lowering::SILGenModule::visitNominalTypeDecl(swift::NominalTypeDecl*) +
30
17 swift 0x0000000104709093
swift::Lowering::SILGenModule::emitSourceFile(swift::SourceFile*, unsigned int)
+ 1795
18 swift 0x000000010470ad4d
swift::SILModule::constructSIL(swift::ModuleDecl*, swift::SILOptions&,
swift::FileUnit*, llvm::Optional<unsigned int>, bool, bool) + 1629
19 swift 0x00000001045621bf
performCompile(swift::CompilerInstance&, swift::CompilerInvocation&,
llvm::ArrayRef<char const*>, int&, swift::FrontendObserver*) + 19487
20 swift 0x000000010455b2c5
swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*,
swift::FrontendObserver*) + 17029
21 swift 0x000000010451888d main + 8685
22 libdyld.dylib 0x00007fff91255255 start + 1
Patrice
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