xref: /aosp_15_r20/external/skia/src/gpu/ganesh/GrVertexChunkArray.cpp (revision c8dee2aa9b3f27cf6c858bd81872bdeb2c07ed17) 
1 /*
2  * Copyright 2021 Google LLC.
3  *
4  * Use of this source code is governed by a BSD-style license that can be
5  * found in the LICENSE file.
6  */
7 
8 #include "src/gpu/ganesh/GrVertexChunkArray.h"
9 
10 #include "src/gpu/ganesh/GrMeshDrawTarget.h"
11 
12 #include <algorithm>
13 
~GrVertexChunkBuilder()14 GrVertexChunkBuilder::~GrVertexChunkBuilder() {
15     if (!fChunks->empty()) {
16         fTarget->putBackVertices(fCurrChunkVertexCapacity - fCurrChunkVertexCount, fStride);
17         fChunks->back().fCount = fCurrChunkVertexCount;
18     }
19 }
20 
allocChunk(int minCount)21 bool GrVertexChunkBuilder::allocChunk(int minCount) {
22     if (!fChunks->empty()) {
23         // No need to put back vertices; the buffer is full.
24         fChunks->back().fCount = fCurrChunkVertexCount;
25     }
26     fCurrChunkVertexCount = 0;
27     GrVertexChunk* chunk = &fChunks->push_back();
28     int minAllocCount = std::max(minCount, fMinVerticesPerChunk);
29     fCurrChunkVertexWriter = fTarget->makeVertexWriterAtLeast(fStride, minAllocCount,
30                                                               minAllocCount, &chunk->fBuffer,
31                                                               &chunk->fBase,
32                                                               &fCurrChunkVertexCapacity);
33     if (!fCurrChunkVertexWriter || !chunk->fBuffer || fCurrChunkVertexCapacity < minCount) {
34         SkDebugf("WARNING: Failed to allocate vertex buffer for GrVertexChunk.\n");
35         fChunks->pop_back();
36         SkASSERT(fCurrChunkVertexCount == 0);
37         fCurrChunkVertexCapacity = 0;
38         return false;
39     }
40     fMinVerticesPerChunk *= 2;
41     return true;
42 }
43