mirror of
https://github.com/MobileGL-Dev/MobileGL
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[Feat] (MG_Remote): MGPCapss two blob serializers and the ABI fingerprint - sparse format-capability tables, length-prefixed renderer strings, every decoder refusing truncation and trailing bytes
This commit is contained in:
@@ -6,11 +6,38 @@
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// SPDX-License-Identifier: LGPL-3.0-only
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// End of Source File Header
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// P5 package w1: MGPCaps's two blob serializers, the pair MGPipeTypes.h:134-136 defers to
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// this phase by name ("Their serializers land with the transport (P5)").
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//
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// THE FORMAT, and every part of it is a refusal rather than a guess. It is
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// ProgramArtifactsCodec's shape on purpose - that codec is the tree's one worked example of a
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// wire format that has survived a real transport, so copying it is cheaper than being
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// original and much cheaper than being wrong:
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//
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// * a VERSION word first, and the two TABLE DIMENSIONS second, so a peer whose
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// TextureInternalFormat enum grew is a mismatch AT READ TIME rather than a silent shear
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// that reads one format's capabilities as another's;
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// * length-prefixed everything, with the count checked against the bytes that REMAIN before
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// a single element is reserved, so a corrupt count cannot become a four-billion-element
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// resize;
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// * SPARSE for all three capability tables. The dense form is
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// 2 * targets * formats * 8 bytes plus the sample-count lists - half a megabyte of mostly
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// zeroes, per context, per caps invalidation (R-12 makes a re-arriving snapshot the
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// invalidation, so this is not a once-per-process cost). The tables are overwhelmingly
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// empty, so what crosses is (index, value) pairs and the decoder Clear()s first;
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// * little-endian by memcpy of fixed-width scalars, which is what every other MobileGL wire
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// struct already assumes and what the ABI fingerprint below makes checkable;
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// * every decoder returns FALSE on truncation, a bad version, a dimension mismatch, an
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// out-of-range index or TRAILING BYTES THE FORMAT DOES NOT ACCOUNT FOR. These bytes
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// arrive over a wire and the outputs are left in a defined, default state on a refusal.
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#include "CapsCodec.h"
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#include <MGGitHash.h>
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#include <MG_Util/Debug/Log.h>
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#include <cstdlib>
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#include <cstring>
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namespace MobileGL::MG_Remote {
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@@ -29,28 +56,437 @@ namespace MobileGL::MG_Remote {
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static_assert(MG_Pipe::kMGPipeSubsystemsMigratedAtP4a <= 0xFFFFull,
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"the subsystem mask no longer fits CallMask's sixteen consumer bits");
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#define MGP5_C0_STUB(what) \
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do { \
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MGLOG_F("MGPipe: Fatal{UnimplementedCapsCodec, \"%s\"} - P5 package w1 has not landed " \
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"this yet; c0 shipped the signature only", \
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what); \
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std::abort(); \
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} while (0)
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namespace {
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Bool EncodeFormatCapabilities(const MG_Backend::FormatCapabilityCache&, Vector<Uint8>&) {
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MGP5_C0_STUB("EncodeFormatCapabilities");
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// Bumped whenever the bytes change in a way a previous reader would misread. A reader
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// that sees a different word REFUSES; it never tries to guess a layout.
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constexpr Uint32 kFormatCapabilitiesCodecVersion = 1;
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constexpr Uint32 kRendererInfoCodecVersion = 1;
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// A count is never believed before it is weighed against the bytes that are left. The
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// largest legal element count in either blob is bounded by the tables' own dimensions,
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// but a String's length is not, so the reader checks bytes rather than a constant.
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class Writer {
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public:
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explicit Writer(Vector<Uint8>& out) : m_out(out) {}
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void Raw(const void* bytes, SizeT size) {
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if (size == 0) {
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return;
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}
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const auto* p = static_cast<const Uint8*>(bytes);
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m_out.insert(m_out.end(), p, p + size);
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}
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void U8(Uint8 v) { Raw(&v, sizeof(v)); }
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void U32(Uint32 v) { Raw(&v, sizeof(v)); }
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void U64(Uint64 v) { Raw(&v, sizeof(v)); }
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void I32(Int32 v) { Raw(&v, sizeof(v)); }
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void Str(const String& s) {
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U32(static_cast<Uint32>(s.size()));
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Raw(s.data(), s.size());
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}
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void OptStr(const Optional<String>& s) {
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U8(s.has_value() ? 1u : 0u);
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if (s.has_value()) {
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Str(*s);
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}
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}
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private:
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Vector<Uint8>& m_out;
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};
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class Reader {
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public:
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Reader(const void* bytes, Uint64 size)
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: m_p(static_cast<const Uint8*>(bytes)), m_left(bytes != nullptr ? size : 0) {}
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Bool Raw(void* out, Uint64 size) {
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if (!m_ok || size > m_left) {
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m_ok = false;
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return false;
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}
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std::memcpy(out, m_p, static_cast<SizeT>(size));
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m_p += size;
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m_left -= size;
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return true;
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}
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Bool U8(Uint8& v) { return Raw(&v, sizeof(v)); }
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Bool U32(Uint32& v) { return Raw(&v, sizeof(v)); }
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Bool U64(Uint64& v) { return Raw(&v, sizeof(v)); }
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Bool I32(Int32& v) { return Raw(&v, sizeof(v)); }
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Bool Str(String& s) {
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Uint32 length = 0;
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if (!U32(length)) {
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return false;
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}
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// THE CHECK THAT MATTERS: the count is weighed against the bytes that remain
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// BEFORE the string is sized, so a corrupt length is a refusal rather than a
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// four-gigabyte allocation.
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if (length > m_left) {
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m_ok = false;
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return false;
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}
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s.assign(reinterpret_cast<const char*>(m_p), static_cast<SizeT>(length));
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m_p += length;
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m_left -= length;
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return true;
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}
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Bool OptStr(Optional<String>& s) {
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Uint8 present = 0;
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if (!U8(present)) {
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return false;
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}
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if (present == 0) {
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s.reset();
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return true;
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}
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String value;
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if (!Str(value)) {
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return false;
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}
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s = Move(value);
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return true;
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}
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// How many elements of `elementBytes` could still possibly be there. The gate a
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// length-prefixed array is held to before it reserves anything.
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Uint64 RoomFor(Uint64 elementBytes) const {
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return elementBytes == 0 ? 0 : m_left / elementBytes;
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}
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Bool Ok() const { return m_ok; }
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Uint64 Left() const { return m_left; }
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// Trailing bytes the format does not account for are a REFUSAL: they mean the
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// writer and the reader disagree about the shape, and the half that was read is
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// not trustworthy just because it parsed.
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Bool Finished() const { return m_ok && m_left == 0; }
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private:
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const Uint8* m_p = nullptr;
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Uint64 m_left = 0;
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Bool m_ok = true;
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};
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using MG_Backend::FormatCapabilityCache;
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using MG_Backend::FormatCapabilityFlags;
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constexpr Uint64 kFormatCells = static_cast<Uint64>(MG_Backend::kFormatCapabilityTargetCount) *
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static_cast<Uint64>(MG_Backend::kFormatCapabilityFormatCount);
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// FNV-1a, the same mixer the tree already uses for build-stamp style fingerprints.
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constexpr Uint64 kFnvOffset = 1469598103934665603ull;
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constexpr Uint64 kFnvPrime = 1099511628211ull;
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Uint64 FnvBytes(Uint64 hash, const void* bytes, SizeT size) {
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const auto* p = static_cast<const Uint8*>(bytes);
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for (SizeT i = 0; i < size; ++i) {
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hash ^= static_cast<Uint64>(p[i]);
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hash *= kFnvPrime;
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}
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return hash;
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}
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Uint64 FnvU64(Uint64 hash, Uint64 value) { return FnvBytes(hash, &value, sizeof(value)); }
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} // namespace
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// ---------------------------------------------------------------------------------
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// FormatCapabilityCache
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// ---------------------------------------------------------------------------------
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Bool EncodeFormatCapabilities(const FormatCapabilityCache& cache, Vector<Uint8>& out) {
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Writer w(out);
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w.U32(kFormatCapabilitiesCodecVersion);
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w.U32(static_cast<Uint32>(MG_Backend::kFormatCapabilityTargetCount));
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w.U32(static_cast<Uint32>(MG_Backend::kFormatCapabilityFormatCount));
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w.U32(0); // reserved, keeps the header 16 bytes and 8-aligned for the pairs below
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// The two flag tables, sparse. A cell is written only when it is non-zero, so what
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// crosses is proportional to what the driver actually supports rather than to the
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// square of two enum spaces.
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const auto writeTable = [&](const MG_Backend::FormatCapabilityTable& table) {
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Uint32 populated = 0;
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for (SizeT t = 0; t < MG_Backend::kFormatCapabilityTargetCount; ++t) {
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for (SizeT f = 0; f < MG_Backend::kFormatCapabilityFormatCount; ++f) {
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if (table[t][f].GetRaw() != 0) {
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++populated;
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}
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}
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}
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w.U32(populated);
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for (SizeT t = 0; t < MG_Backend::kFormatCapabilityTargetCount; ++t) {
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for (SizeT f = 0; f < MG_Backend::kFormatCapabilityFormatCount; ++f) {
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const Uint64 raw = static_cast<Uint64>(table[t][f].GetRaw());
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if (raw == 0) {
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continue;
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}
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w.U32(static_cast<Uint32>(t * MG_Backend::kFormatCapabilityFormatCount + f));
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w.U64(raw);
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}
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}
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};
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writeTable(cache.FullCaps);
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writeTable(cache.CaveatCaps);
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// The sample-count lists: the Vector<Int> that is the reason this cannot be a memcpy.
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Uint32 populated = 0;
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for (SizeT t = 0; t < MG_Backend::kFormatCapabilityTargetCount; ++t) {
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for (SizeT f = 0; f < MG_Backend::kFormatCapabilityFormatCount; ++f) {
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if (!cache.SampleCounts[t][f].empty()) {
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++populated;
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}
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}
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}
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w.U32(populated);
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for (SizeT t = 0; t < MG_Backend::kFormatCapabilityTargetCount; ++t) {
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for (SizeT f = 0; f < MG_Backend::kFormatCapabilityFormatCount; ++f) {
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const Vector<Int>& counts = cache.SampleCounts[t][f];
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if (counts.empty()) {
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continue;
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}
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w.U32(static_cast<Uint32>(t * MG_Backend::kFormatCapabilityFormatCount + f));
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w.U32(static_cast<Uint32>(counts.size()));
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for (const Int value : counts) {
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w.I32(static_cast<Int32>(value));
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}
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}
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}
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return true;
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}
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Bool DecodeFormatCapabilities(const void*, Uint64, MG_Backend::FormatCapabilityCache&) {
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MGP5_C0_STUB("DecodeFormatCapabilities");
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Bool DecodeFormatCapabilities(const void* bytes, Uint64 size, FormatCapabilityCache& out) {
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out.Clear();
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Reader r(bytes, size);
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Uint32 version = 0;
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Uint32 targets = 0;
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Uint32 formats = 0;
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Uint32 reserved = 0;
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if (!r.U32(version) || !r.U32(targets) || !r.U32(formats) || !r.U32(reserved)) {
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return false;
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}
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if (version != kFormatCapabilitiesCodecVersion) {
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MGLOG_E("MG_Remote caps: format-capability blob is version %u, this build reads %u",
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version, kFormatCapabilitiesCodecVersion);
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return false;
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}
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if (targets != MG_Backend::kFormatCapabilityTargetCount ||
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formats != MG_Backend::kFormatCapabilityFormatCount) {
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// Not a corrupt stream: a peer whose TextureTarget or TextureInternalFormat enum
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// is a different size. Reading it anyway shears every cell onto a neighbouring
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// format, which is exactly the failure the ABI fingerprint exists to make loud.
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MGLOG_E("MG_Remote caps: format-capability blob is %ux%u, this build is %llux%llu",
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targets, formats,
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static_cast<unsigned long long>(MG_Backend::kFormatCapabilityTargetCount),
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static_cast<unsigned long long>(MG_Backend::kFormatCapabilityFormatCount));
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return false;
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}
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const auto readTable = [&](MG_Backend::FormatCapabilityTable& table) -> Bool {
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Uint32 populated = 0;
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if (!r.U32(populated)) {
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return false;
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}
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if (populated > r.RoomFor(sizeof(Uint32) + sizeof(Uint64))) {
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return false;
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}
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for (Uint32 i = 0; i < populated; ++i) {
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Uint32 index = 0;
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Uint64 raw = 0;
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if (!r.U32(index) || !r.U64(raw)) {
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return false;
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}
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if (static_cast<Uint64>(index) >= kFormatCells) {
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return false;
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}
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table[index / MG_Backend::kFormatCapabilityFormatCount]
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[index % MG_Backend::kFormatCapabilityFormatCount] =
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FormatCapabilityFlags(raw);
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}
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return true;
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};
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if (!readTable(out.FullCaps) || !readTable(out.CaveatCaps)) {
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out.Clear();
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return false;
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}
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Uint32 populated = 0;
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if (!r.U32(populated) || populated > r.RoomFor(2 * sizeof(Uint32))) {
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out.Clear();
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return false;
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}
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for (Uint32 i = 0; i < populated; ++i) {
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Uint32 index = 0;
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Uint32 count = 0;
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if (!r.U32(index) || !r.U32(count)) {
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out.Clear();
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return false;
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}
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if (static_cast<Uint64>(index) >= kFormatCells || count > r.RoomFor(sizeof(Int32))) {
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out.Clear();
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return false;
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}
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Vector<Int>& counts = out.SampleCounts[index / MG_Backend::kFormatCapabilityFormatCount]
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[index % MG_Backend::kFormatCapabilityFormatCount];
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counts.resize(static_cast<SizeT>(count));
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for (Uint32 j = 0; j < count; ++j) {
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Int32 value = 0;
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if (!r.I32(value)) {
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out.Clear();
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return false;
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}
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counts[j] = static_cast<Int>(value);
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}
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}
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if (!r.Finished()) {
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MGLOG_E("MG_Remote caps: format-capability blob has %llu trailing bytes the format "
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"does not account for",
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static_cast<unsigned long long>(r.Left()));
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out.Clear();
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return false;
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}
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return true;
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}
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Bool EncodeRendererInfo(const RendererInfo&, Vector<Uint8>&) { MGP5_C0_STUB("EncodeRendererInfo"); }
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// ---------------------------------------------------------------------------------
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// RendererInfo
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// ---------------------------------------------------------------------------------
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Bool DecodeRendererInfo(const void*, Uint64, RendererInfo&) { MGP5_C0_STUB("DecodeRendererInfo"); }
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namespace {
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Uint64 CapsAbiFingerprint() { MGP5_C0_STUB("CapsAbiFingerprint"); }
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void WriteVersion(Writer& w, const Version& v) {
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w.I32(static_cast<Int32>(v.Major));
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w.I32(static_cast<Int32>(v.Minor));
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w.I32(static_cast<Int32>(v.Patch));
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w.OptStr(v.Suffix);
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w.U8(v.Type.has_value() ? 1u : 0u);
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w.U8(v.Type.has_value() ? static_cast<Uint8>(*v.Type) : 0u);
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}
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#undef MGP5_C0_STUB
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Bool ReadVersion(Reader& r, Version& v) {
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Int32 major = 0;
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Int32 minor = 0;
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Int32 patch = 0;
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if (!r.I32(major) || !r.I32(minor) || !r.I32(patch)) {
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return false;
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}
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v.Major = static_cast<Int>(major);
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v.Minor = static_cast<Int>(minor);
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v.Patch = static_cast<Int>(patch);
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if (!r.OptStr(v.Suffix)) {
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return false;
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}
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Uint8 hasType = 0;
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Uint8 type = 0;
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if (!r.U8(hasType) || !r.U8(type)) {
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return false;
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}
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if (hasType != 0) {
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v.Type = static_cast<VersionType>(type);
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} else {
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v.Type.reset();
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}
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return true;
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}
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} // namespace
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Bool EncodeRendererInfo(const RendererInfo& info, Vector<Uint8>& out) {
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Writer w(out);
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w.U32(kRendererInfoCodecVersion);
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w.Str(info.RendererName);
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w.Str(info.BackendName);
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w.OptStr(info.ExtraVendor);
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WriteVersion(w, info.RendererGLInfo.TargetGLVersion);
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WriteVersion(w, info.RendererGLInfo.TargetGLSLVersion);
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w.U32(static_cast<Uint32>(info.RendererGLInfo.Extensions.size()));
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for (const GLExtension extension : info.RendererGLInfo.Extensions) {
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w.U32(static_cast<Uint32>(extension));
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}
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w.U8(info.RendererGLInfo.IsCompatibilityProfile ? 1u : 0u);
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w.U8(info.StaticBackendCapability.AllowVSOnlyPrograms ? 1u : 0u);
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return true;
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}
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Bool DecodeRendererInfo(const void* bytes, Uint64 size, RendererInfo& out) {
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out = RendererInfo{};
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Reader r(bytes, size);
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Uint32 version = 0;
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if (!r.U32(version)) {
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return false;
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}
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if (version != kRendererInfoCodecVersion) {
|
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MGLOG_E("MG_Remote caps: renderer-info blob is version %u, this build reads %u", version,
|
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kRendererInfoCodecVersion);
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return false;
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}
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if (!r.Str(out.RendererName) || !r.Str(out.BackendName) || !r.OptStr(out.ExtraVendor) ||
|
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!ReadVersion(r, out.RendererGLInfo.TargetGLVersion) ||
|
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!ReadVersion(r, out.RendererGLInfo.TargetGLSLVersion)) {
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out = RendererInfo{};
|
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return false;
|
||||
}
|
||||
|
||||
Uint32 extensionCount = 0;
|
||||
if (!r.U32(extensionCount) || extensionCount > r.RoomFor(sizeof(Uint32))) {
|
||||
out = RendererInfo{};
|
||||
return false;
|
||||
}
|
||||
out.RendererGLInfo.Extensions.resize(static_cast<SizeT>(extensionCount));
|
||||
for (Uint32 i = 0; i < extensionCount; ++i) {
|
||||
Uint32 value = 0;
|
||||
if (!r.U32(value)) {
|
||||
out = RendererInfo{};
|
||||
return false;
|
||||
}
|
||||
out.RendererGLInfo.Extensions[i] = static_cast<GLExtension>(value);
|
||||
}
|
||||
|
||||
Uint8 compatibility = 0;
|
||||
Uint8 vsOnly = 0;
|
||||
if (!r.U8(compatibility) || !r.U8(vsOnly)) {
|
||||
out = RendererInfo{};
|
||||
return false;
|
||||
}
|
||||
out.RendererGLInfo.IsCompatibilityProfile = compatibility != 0;
|
||||
out.StaticBackendCapability.AllowVSOnlyPrograms = vsOnly != 0;
|
||||
|
||||
if (!r.Finished()) {
|
||||
MGLOG_E("MG_Remote caps: renderer-info blob has %llu trailing bytes the format does "
|
||||
"not account for",
|
||||
static_cast<unsigned long long>(r.Left()));
|
||||
out = RendererInfo{};
|
||||
return false;
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
||||
// ---------------------------------------------------------------------------------
|
||||
// The ABI assertion the handshake carries
|
||||
// ---------------------------------------------------------------------------------
|
||||
|
||||
Uint64 CapsAbiFingerprint() {
|
||||
// MGPCaps has only a COMPOSITIONAL size assertion (MGPipeTypes.h:145-146) because
|
||||
// DynamicBackendParameters still carries SizeT and GLenum members - P0.5's fixed-width
|
||||
// rewrite did not happen and P5 does not do it either (table 0's ABI row; the rewrite
|
||||
// is P7's account). So the caps block's literal size IS ABI-dependent, and this
|
||||
// fingerprint is what turns that from a latent hazard into a named refusal.
|
||||
//
|
||||
// The git stamp is in it because two builds of the same sizes can still disagree about
|
||||
// a FIELD ORDER, which no sizeof can see; P6's spawn is same-machine and same-binary,
|
||||
// so it inherits this unchanged rather than needing a looser rule.
|
||||
Uint64 hash = kFnvOffset;
|
||||
hash = FnvU64(hash, sizeof(MG_Backend::DynamicBackendParameters));
|
||||
hash = FnvU64(hash, sizeof(MG_Pipe::MGPCaps));
|
||||
hash = FnvU64(hash, sizeof(MG_Backend::GLFunctionsTable));
|
||||
hash = FnvU64(hash, static_cast<Uint64>(MG_Backend::kFormatCapabilityTargetCount));
|
||||
hash = FnvU64(hash, static_cast<Uint64>(MG_Backend::kFormatCapabilityFormatCount));
|
||||
hash = FnvU64(hash, kFormatCapabilitiesCodecVersion);
|
||||
hash = FnvU64(hash, kRendererInfoCodecVersion);
|
||||
hash = FnvU64(hash, static_cast<Uint64>(MG_Pipe::MGPWireOp::kOpCount));
|
||||
hash = FnvBytes(hash, GIT_COMMIT_HASH_SHORT, std::strlen(GIT_COMMIT_HASH_SHORT));
|
||||
return hash;
|
||||
}
|
||||
|
||||
} // namespace MobileGL::MG_Remote
|
||||
|
||||
Reference in New Issue
Block a user