blob: 19569b6d4982c66b0c15d4e89e534d771d64ca35 [file] [log] [blame]
/*
* Copyright 2021 Google LLC
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "src/gpu/GrPersistentCacheUtils.h"
#include "include/private/SkSLString.h"
#include "src/core/SkReadBuffer.h"
#include "src/core/SkWriteBuffer.h"
namespace GrPersistentCacheUtils {
static constexpr int kCurrentVersion = 6;
int GetCurrentVersion() {
// The persistent cache stores a copy of the SkSL::Program::Inputs struct. If you alter the
// Program::Inputs struct in any way, you must increment kCurrentVersion to invalidate the
// outdated persistent cache files. The KnownSkSLProgramInputs struct must also be updated to
// match the new contents of Program::Inputs.
struct KnownSkSLProgramInputs { bool height, flipY, usesYDeriv; };
static_assert(sizeof(SkSL::Program::Inputs) == sizeof(KnownSkSLProgramInputs));
return kCurrentVersion;
}
sk_sp<SkData> PackCachedShaders(SkFourByteTag shaderType,
const SkSL::String shaders[],
const SkSL::Program::Inputs inputs[],
int numInputs,
const ShaderMetadata* meta) {
// For consistency (so tools can blindly pack and unpack cached shaders), we always write
// kGrShaderTypeCount inputs. If the backend gives us fewer, we just replicate the last one.
SkASSERT(numInputs >= 1 && numInputs <= kGrShaderTypeCount);
SkBinaryWriteBuffer writer;
writer.writeInt(kCurrentVersion);
writer.writeUInt(shaderType);
for (int i = 0; i < kGrShaderTypeCount; ++i) {
writer.writeByteArray(shaders[i].c_str(), shaders[i].size());
writer.writePad32(&inputs[std::min(i, numInputs - 1)], sizeof(SkSL::Program::Inputs));
}
writer.writeBool(SkToBool(meta));
if (meta) {
writer.writeBool(SkToBool(meta->fSettings));
if (meta->fSettings) {
writer.writeBool(meta->fSettings->fFlipY);
writer.writeBool(meta->fSettings->fFragColorIsInOut);
writer.writeBool(meta->fSettings->fForceHighPrecision);
writer.writeBool(meta->fSettings->fUsePushConstants);
}
writer.writeInt(meta->fAttributeNames.count());
for (const auto& attr : meta->fAttributeNames) {
writer.writeByteArray(attr.c_str(), attr.size());
}
writer.writeBool(meta->fHasCustomColorOutput);
writer.writeBool(meta->fHasSecondaryColorOutput);
if (meta->fPlatformData) {
writer.writeByteArray(meta->fPlatformData->data(), meta->fPlatformData->size());
}
}
return writer.snapshotAsData();
}
SkFourByteTag GetType(SkReadBuffer* reader) {
constexpr SkFourByteTag kInvalidTag = ~0;
int version = reader->readInt();
SkFourByteTag typeTag = reader->readUInt();
return reader->validate(version == kCurrentVersion) ? typeTag : kInvalidTag;
}
bool UnpackCachedShaders(SkReadBuffer* reader,
SkSL::String shaders[],
SkSL::Program::Inputs inputs[],
int numInputs,
ShaderMetadata* meta) {
for (int i = 0; i < kGrShaderTypeCount; ++i) {
size_t shaderLen = 0;
const char* shaderBuf = static_cast<const char*>(reader->skipByteArray(&shaderLen));
if (shaderBuf) {
shaders[i].assign(shaderBuf, shaderLen);
}
// GL, for example, only wants one set of Inputs
if (i < numInputs) {
reader->readPad32(&inputs[i], sizeof(inputs[i]));
} else {
reader->skip(sizeof(SkSL::Program::Inputs));
}
}
if (reader->readBool() && meta) {
SkASSERT(meta->fSettings != nullptr);
if (reader->readBool()) {
meta->fSettings->fFlipY = reader->readBool();
meta->fSettings->fFragColorIsInOut = reader->readBool();
meta->fSettings->fForceHighPrecision = reader->readBool();
meta->fSettings->fUsePushConstants = reader->readBool();
}
meta->fAttributeNames.resize(reader->readInt());
for (auto& attr : meta->fAttributeNames) {
size_t attrLen = 0;
const char* attrName = static_cast<const char*>(reader->skipByteArray(&attrLen));
if (attrName) {
attr.assign(attrName, attrLen);
}
}
meta->fHasCustomColorOutput = reader->readBool();
meta->fHasSecondaryColorOutput = reader->readBool();
// a given platform will be responsible for reading its data
}
if (!reader->isValid()) {
for (int i = 0; i < kGrShaderTypeCount; ++i) {
shaders[i].clear();
}
}
return reader->isValid();
}
} // namespace GrPersistentCacheUtils