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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrReorderCommandBuilder.h"
#include "SkStringUtils.h"
template <class Left, class Right>
static bool intersect(const Left& a, const Right& b) {
SkASSERT(a.fLeft <= a.fRight && a.fTop <= a.fBottom &&
b.fLeft <= b.fRight && b.fTop <= b.fBottom);
return a.fLeft < b.fRight && b.fLeft < a.fRight &&
a.fTop < b.fBottom && b.fTop < a.fBottom;
}
GrTargetCommands::Cmd* GrReorderCommandBuilder::recordDrawBatch(GrBatch* batch,
const GrCaps& caps) {
// Check if there is a Batch Draw we can batch with by linearly searching back until we either
// 1) check every draw
// 2) intersect with something
// 3) find a 'blocker'
// Experimentally we have found that most batching occurs within the first 10 comparisons.
static const int kMaxLookback = 10;
int i = 0;
GrBATCH_INFO("Re-Recording (%s, B%u)\n"
"\tBounds (%f, %f, %f, %f)\n",
batch->name(),
batch->uniqueID(),
batch->bounds().fLeft, batch->bounds().fRight,
batch->bounds().fTop, batch->bounds().fBottom);
GrBATCH_INFO(SkTabString(batch->dumpInfo(), 1).c_str());
GrBATCH_INFO("\tOutcome:\n");
if (!this->cmdBuffer()->empty()) {
GrTargetCommands::CmdBuffer::ReverseIter reverseIter(*this->cmdBuffer());
do {
if (Cmd::kDrawBatch_CmdType == reverseIter->type()) {
DrawBatch* previous = static_cast<DrawBatch*>(reverseIter.get());
if (previous->batch()->renderTargetUniqueID() != batch->renderTargetUniqueID()) {
GrBATCH_INFO("\t\tBreaking because of (%s, B%u) Rendertarget\n",
previous->batch()->name(), previous->batch()->uniqueID());
break;
}
// We cannot continue to search backwards if the render target changes
if (previous->batch()->combineIfPossible(batch, caps)) {
GrBATCH_INFO("\t\tCombining with (%s, B%u)\n",
previous->batch()->name(), previous->batch()->uniqueID());
return nullptr;
}
if (intersect(previous->batch()->bounds(), batch->bounds())) {
GrBATCH_INFO("\t\tIntersects with (%s, B%u)\n",
previous->batch()->name(), previous->batch()->uniqueID());
break;
}
} else {
GrBATCH_INFO("\t\tBreaking because of other %08x\n", reverseIter->type());
// TODO temporary until we only have batches.
break;
}
} while (reverseIter.previous() && ++i < kMaxLookback);
#if GR_BATCH_SPEW
if (!reverseIter.get()) {
GrBATCH_INFO("\t\tNo more commands to try and batch with\n");
} else if (i >= kMaxLookback) {
GrBATCH_INFO("\t\tReached max lookback %d\n", i);
}
#endif
}
#if GR_BATCH_SPEW
else {
GrBATCH_INFO("\t\tBreaking because empty command buffer\n");
}
#endif
return GrNEW_APPEND_TO_RECORDER(*this->cmdBuffer(), DrawBatch, (batch));
}
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