237870 2022-03-14 20:28:20 -0700 [WebGPU] Implement first draft of buffer mapping according to the spec 2022-03-16 14:50:22 -0700 1 1 1 Unclassified WebKit WebGPU WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 237869 237583 237871 1 mmaxfield mmaxfield dino djg kkinnunen webkit-bug-importer oldest_to_newest 1851130 0 mmaxfield 2022-03-14 20:28:20 -0700 . 1851131 1 454657 mmaxfield 2022-03-14 20:32:45 -0700 Created attachment 454657 Patch 1851141 2 454657 mmaxfield 2022-03-14 21:36:36 -0700 Comment on attachment 454657 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=454657&action=review > Source/WebGPU/WebGPU/Buffer.mm:352 > + if (validateUnmap()) { if (!validateUnmap()) 1851151 3 454663 mmaxfield 2022-03-14 22:04:32 -0700 Created attachment 454663 Patch 1851770 4 454663 kkinnunen 2022-03-16 06:43:04 -0700 Comment on attachment 454663 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=454663&action=review some nits > Source/WebGPU/WebGPU/Buffer.h:44 > + using MappingRange = std::pair<size_t, size_t>; Is there a benefit to using pair instead of real struct? You take a hit with the cumbersomeness of make_pair, requiring static casts > Source/WebGPU/WebGPU/Buffer.h:85 > + size_t m_size { 0 }; // "The length of the GPUBuffer allocation in bytes." if some of these never change, you could mark them as const and not have the initialiser.. > Source/WebGPU/WebGPU/Buffer.mm:43 > + // FIXME: "If any of the bits of descriptor’s usage aren’t present in this device’s [[allowed buffer usages]] return false." non-latin chars in comment? > Source/WebGPU/WebGPU/Buffer.mm:77 > + if (descriptor.mappedAtCreation && isNotMultipleOfPowerOfTwo(descriptor.size, 4)) typically I'd expect descriptor.size is a multiple of 4. descriptor.size % 4 == 0 E.g. in this case I'd expect descriptor.mappedAtCreation && (descriptor.size % 4) != 0 I couldn't understand that function immediately isNotMultipleOfPowerOfTwo, read it as "is not multiple power of two x, y". > Source/WebGPU/WebGPU/Buffer.mm:114 > + buffer.label = [NSString stringWithCString:descriptor.label encoding:NSUTF8StringEncoding]; maybe descriptor.label == nullptr is fixed up in the latter commit? > Source/WebGPU/WebGPU/Buffer.mm:132 > + return Buffer::create(buffer, descriptor.size, descriptor.usage, Buffer::State::MappedAtCreation, std::make_pair(static_cast<size_t>(0), descriptor.size), *this); std::make_pair could be just {0, descriptor.size} if your MappingRange would be normal struct. > Source/WebGPU/WebGPU/Buffer.mm:186 > + if (isNotMultipleOfPowerOfTwo(offset, 8)) here you check offset and 8, maybe intended is something else. (I don't understand the isNotMultipleOfPowerOfTwo func) > Source/WebGPU/WebGPU/Buffer.mm:195 > + if (offset + rangeSize > m_mappingRange.second) could move this to a variable, so then when the variable is declared checked arithmetic, you get the checked value down below in line 199 > Source/WebGPU/WebGPU/Buffer.mm:213 > + rangeSize = std::max(static_cast<size_t>(0), m_size - offset); I'm terrible at these, but: m_size - offset is still unsigned, so I don't think this is valid. size_t value = 1; value -= 77; assert(std::max<size_t>(0, value) == value) Writing these checks without checked arithmetic or if (offset > m_size) does not produce very understandable code > Source/WebGPU/WebGPU/Buffer.mm:275 > + rangeSize = std::max(static_cast<size_t>(0), m_size - offset); max(0, u) is always u when u is unsigned. > Source/WebGPU/WebGPU/Device.h:97 > + bool m_hasUnifiedMemory { false }; could also be hasUnfifiedMemory() ... or could be const field > Source/WebGPU/WebGPU/Utilities.h:32 > +inline bool isNotMultipleOfPowerOfTwo(uint64_t x, uint64_t y) If it is used to check (x % y) == 0 then I'd expect the check to be written inline instead of custom function with bit twiddling. compiler knows all your ys, so it should be able to generate better code than you.. Similar functions exist in WTF StdLibExtras.h, so if this sort of stuff is added, maybe there.. also the "power of two" seems like a implementation detail. So we could call it isNotMultipleOf(x, y) and we would then do if constexpr(isPowerOfTwo(y)) .... and then we would arrive the same conclusion that we should just let the compiler handle that, as it has isMultipleOf(a,b) implemented as (a%b) == 0 1851776 5 454663 kkinnunen 2022-03-16 07:10:55 -0700 Comment on attachment 454663 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=454663&action=review >> Source/WebGPU/WebGPU/Buffer.mm:186 >> + if (isNotMultipleOfPowerOfTwo(offset, 8)) > > here you check offset and 8, maybe intended is something else. > (I don't understand the isNotMultipleOfPowerOfTwo func) Clarifying: - offset is checked already - here you have a copy-paste error, you should check `(rangeSize % 4)` 1851998 6 454663 mmaxfield 2022-03-16 14:45:35 -0700 Comment on attachment 454663 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=454663&action=review >> Source/WebGPU/WebGPU/Buffer.h:85 >> + size_t m_size { 0 }; // "The length of the GPUBuffer allocation in bytes." > > if some of these never change, you could mark them as const and not have the initialiser.. Good idea!!! >> Source/WebGPU/WebGPU/Buffer.mm:43 >> + // FIXME: "If any of the bits of descriptor’s usage aren’t present in this device’s [[allowed buffer usages]] return false." > > non-latin chars in comment? It's a copy/paste. It's probably valuable to keep the original source text in the comment, so it can be copied and searched for within the spec. >> Source/WebGPU/WebGPU/Buffer.mm:77 >> + if (descriptor.mappedAtCreation && isNotMultipleOfPowerOfTwo(descriptor.size, 4)) > > typically I'd expect > descriptor.size is a multiple of 4. > descriptor.size % 4 == 0 > > E.g. in this case I'd expect > descriptor.mappedAtCreation && (descriptor.size % 4) != 0 > > I couldn't understand that function immediately isNotMultipleOfPowerOfTwo, read it as "is not multiple power of two x, y". Right, good idea. >> Source/WebGPU/WebGPU/Buffer.mm:114 >> + buffer.label = [NSString stringWithCString:descriptor.label encoding:NSUTF8StringEncoding]; > > maybe descriptor.label == nullptr is fixed up in the latter commit? Yes. >> Source/WebGPU/WebGPU/Buffer.mm:132 >> + return Buffer::create(buffer, descriptor.size, descriptor.usage, Buffer::State::MappedAtCreation, std::make_pair(static_cast<size_t>(0), descriptor.size), *this); > > std::make_pair could be just {0, descriptor.size} if your MappingRange would be normal struct. Yep! >>> Source/WebGPU/WebGPU/Buffer.mm:186 >>> + if (isNotMultipleOfPowerOfTwo(offset, 8)) >> >> here you check offset and 8, maybe intended is something else. >> (I don't understand the isNotMultipleOfPowerOfTwo func) > > Clarifying: > - offset is checked already > - here you have a copy-paste error, you should check `(rangeSize % 4)` Yes, it's a copy-paste error. Good catch. >> Source/WebGPU/WebGPU/Buffer.mm:213 >> + rangeSize = std::max(static_cast<size_t>(0), m_size - offset); > > I'm terrible at these, but: > m_size - offset is still unsigned, so I don't think this is valid. > > size_t value = 1; > value -= 77; > assert(std::max<size_t>(0, value) == value) > > > Writing these checks without checked arithmetic or if (offset > m_size) does not produce very understandable code Right, this will be handled when I switch to using checked arithmetic. You're right that it's kind of silly now, but it's temporary. >> Source/WebGPU/WebGPU/Buffer.mm:275 >> + rangeSize = std::max(static_cast<size_t>(0), m_size - offset); > > max(0, u) is always u when u is unsigned. Ditto. >> Source/WebGPU/WebGPU/Utilities.h:32 >> +inline bool isNotMultipleOfPowerOfTwo(uint64_t x, uint64_t y) > > If it is used to check (x % y) == 0 then I'd expect the check to be written inline instead of custom function with bit twiddling. > > compiler knows all your ys, so it should be able to generate better code than you.. > > Similar functions exist in WTF StdLibExtras.h, so if this sort of stuff is added, maybe there.. > > also the "power of two" seems like a implementation detail. So we could call it > isNotMultipleOf(x, y) > and we would then do > if constexpr(isPowerOfTwo(y)) .... > and then we would arrive the same conclusion that we should just let the compiler handle that, as it has isMultipleOf(a,b) implemented as (a%b) == 0 I've deleted this function. 1852001 7 mmaxfield 2022-03-16 14:49:58 -0700 Committed r291369 (248501@trunk): <https://commits.webkit.org/248501@trunk> 1852002 8 webkit-bug-importer 2022-03-16 14:50:22 -0700 <rdar://problem/90393491> 454657 2022-03-14 20:32:45 -0700 2022-03-14 22:04:32 -0700 Patch patch.diff text/plain 24587 mmaxfield Y29tbWl0IDdmNmMxMDYxY2JiOGYyNjdmYzZiZDFlZTIzODNhYWRlODEyMWFhYjQKQXV0aG9yOiBN eWxlcyBDLiBNYXhmaWVsZCA8bW1heGZpZWxkQGFwcGxlLmNvbT4KRGF0ZTogICBNb24gTWFyIDE0 IDIwOjMwOjI3IDIwMjIgLTA3MDAKCiAgICBQYXJ0IDYKCmRpZmYgLS1naXQgYS9Tb3VyY2UvV1RG L0NoYW5nZUxvZyBiL1NvdXJjZS9XVEYvQ2hhbmdlTG9nCmluZGV4IGY5ZmFkYjZiMDE5ZC4uZmYw ZWRjN2JkNzA3IDEwMDY0NAotLS0gYS9Tb3VyY2UvV1RGL0NoYW5nZUxvZworKysgYi9Tb3VyY2Uv 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