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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"
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(State* state, GrBatch* batch) {
// 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;
batch->setPipeline(state->getPipeline());
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->fBatch->combineIfPossible(batch)) {
return NULL;
}
if (intersect(previous->fBatch->bounds(), batch->bounds())) {
break;
}
} else if (Cmd::kClear_CmdType == reverseIter->type()) {
Clear* previous = static_cast<Clear*>(reverseIter.get());
// We set the color to illegal if we are doing a discard.
// If we can ignore the rect, then we do a full clear
if (previous->fColor == GrColor_ILLEGAL ||
previous->fCanIgnoreRect ||
intersect(batch->bounds(), previous->fRect)) {
break;
}
} else {
// TODO temporary until we can navigate the other types of commands
break;
}
} while (reverseIter.previous() && ++i < kMaxLookback);
}
return GrNEW_APPEND_TO_RECORDER(*this->cmdBuffer(), DrawBatch, (state, batch,
this->batchTarget()));
}
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