1// Copyright 2016 The SwiftShader Authors. All Rights Reserved.
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7// http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15// IndexDataManager.h: Defines the IndexDataManager, a class that
16// runs the Buffer translation process for index buffers.
17
18#ifndef LIBGLESV2_INDEXDATAMANAGER_H_
19#define LIBGLESV2_INDEXDATAMANAGER_H_
20
21#include "Context.h"
22
23#include <GLES2/gl2.h>
24
25namespace es2
26{
27
28struct TranslatedIndexData
29{
30 TranslatedIndexData(unsigned int primitiveCount) : primitiveCount(primitiveCount) {}
31
32 unsigned int minIndex;
33 unsigned int maxIndex;
34 unsigned int indexOffset;
35 unsigned int primitiveCount;
36
37 sw::Resource *indexBuffer;
38};
39
40class StreamingIndexBuffer
41{
42public:
43 StreamingIndexBuffer(size_t initialSize);
44 virtual ~StreamingIndexBuffer();
45
46 void *map(size_t requiredSpace, size_t *offset);
47 void unmap();
48 void reserveSpace(size_t requiredSpace, GLenum type);
49
50 sw::Resource *getResource() const;
51
52private:
53 sw::Resource *mIndexBuffer;
54 size_t mBufferSize;
55 size_t mWritePosition;
56};
57
58class IndexDataManager
59{
60public:
61 IndexDataManager();
62 virtual ~IndexDataManager();
63
64 GLenum prepareIndexData(GLenum mode, GLenum type, GLuint start, GLuint end, GLsizei count, Buffer *arrayElementBuffer, const void *indices, TranslatedIndexData *translated, bool primitiveRestart);
65
66 static std::size_t typeSize(GLenum type);
67
68private:
69 StreamingIndexBuffer *mStreamingBuffer;
70};
71
72}
73
74#endif // LIBGLESV2_INDEXDATAMANAGER_H_
75