1 /*
2 Copyright 2011 Google Inc.
3
4 Licensed under the Apache License, Version 2.0 (the "License");
5 you may not use this file except in compliance with the License.
6 You may obtain a copy of the License at
7
8 http://www.apache.org/licenses/LICENSE-2.0
9
10 Unless required by applicable law or agreed to in writing, software
11 distributed under the License is distributed on an "AS IS" BASIS,
12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 See the License for the specific language governing permissions and
14 limitations under the License.
15 */
16
17
18 #include "GrGLVertexBuffer.h"
19 #include "GrGpuGL.h"
20
21 #define GPUGL static_cast<GrGpuGL*>(getGpu())
22
GrGLVertexBuffer(GrGpuGL * gpu,GrGLuint id,size_t sizeInBytes,bool dynamic)23 GrGLVertexBuffer::GrGLVertexBuffer(GrGpuGL* gpu,
24 GrGLuint id,
25 size_t sizeInBytes,
26 bool dynamic)
27 : INHERITED(gpu, sizeInBytes, dynamic)
28 , fBufferID(id)
29 , fLockPtr(NULL) {
30 }
31
onRelease()32 void GrGLVertexBuffer::onRelease() {
33 // make sure we've not been abandoned
34 if (fBufferID) {
35 GPUGL->notifyVertexBufferDelete(this);
36 GR_GL(DeleteBuffers(1, &fBufferID));
37 fBufferID = 0;
38 }
39 }
40
onAbandon()41 void GrGLVertexBuffer::onAbandon() {
42 fBufferID = 0;
43 fLockPtr = NULL;
44 }
45
bind() const46 void GrGLVertexBuffer::bind() const {
47 GR_GL(BindBuffer(GR_GL_ARRAY_BUFFER, fBufferID));
48 GPUGL->notifyVertexBufferBind(this);
49 }
50
bufferID() const51 GrGLuint GrGLVertexBuffer::bufferID() const {
52 return fBufferID;
53 }
54
lock()55 void* GrGLVertexBuffer::lock() {
56 GrAssert(fBufferID);
57 GrAssert(!isLocked());
58 if (GPUGL->supportsBufferLocking()) {
59 this->bind();
60 // Let driver know it can discard the old data
61 GR_GL(BufferData(GR_GL_ARRAY_BUFFER, size(), NULL,
62 dynamic() ? GR_GL_DYNAMIC_DRAW : GR_GL_STATIC_DRAW));
63 fLockPtr = GR_GL(MapBuffer(GR_GL_ARRAY_BUFFER, GR_GL_WRITE_ONLY));
64 return fLockPtr;
65 }
66 return NULL;
67 }
68
lockPtr() const69 void* GrGLVertexBuffer::lockPtr() const {
70 return fLockPtr;
71 }
72
unlock()73 void GrGLVertexBuffer::unlock() {
74
75 GrAssert(fBufferID);
76 GrAssert(isLocked());
77 GrAssert(GPUGL->supportsBufferLocking());
78
79 this->bind();
80 GR_GL(UnmapBuffer(GR_GL_ARRAY_BUFFER));
81 fLockPtr = NULL;
82 }
83
isLocked() const84 bool GrGLVertexBuffer::isLocked() const {
85 GrAssert(!this->isValid() || fBufferID);
86 #if GR_DEBUG
87 if (this->isValid() && GPUGL->supportsBufferLocking()) {
88 GrGLint mapped;
89 this->bind();
90 GR_GL(GetBufferParameteriv(GR_GL_ARRAY_BUFFER, GR_GL_BUFFER_MAPPED, &mapped));
91 GrAssert(!!mapped == !!fLockPtr);
92 }
93 #endif
94 return NULL != fLockPtr;
95 }
96
updateData(const void * src,size_t srcSizeInBytes)97 bool GrGLVertexBuffer::updateData(const void* src, size_t srcSizeInBytes) {
98 GrAssert(fBufferID);
99 GrAssert(!isLocked());
100 if (srcSizeInBytes > size()) {
101 return false;
102 }
103 this->bind();
104 GrGLenum usage = dynamic() ? GR_GL_DYNAMIC_DRAW : GR_GL_STATIC_DRAW;
105 if (size() == srcSizeInBytes) {
106 GR_GL(BufferData(GR_GL_ARRAY_BUFFER, srcSizeInBytes, src, usage));
107 } else {
108 GR_GL(BufferData(GR_GL_ARRAY_BUFFER, size(), NULL, usage));
109 GR_GL(BufferSubData(GR_GL_ARRAY_BUFFER, 0, srcSizeInBytes, src));
110 }
111 return true;
112 }
113
updateSubData(const void * src,size_t srcSizeInBytes,size_t offset)114 bool GrGLVertexBuffer::updateSubData(const void* src,
115 size_t srcSizeInBytes,
116 size_t offset) {
117 GrAssert(fBufferID);
118 GrAssert(!isLocked());
119 if (srcSizeInBytes + offset > size()) {
120 return false;
121 }
122 this->bind();
123 GR_GL(BufferSubData(GR_GL_ARRAY_BUFFER, offset, srcSizeInBytes, src));
124 return true;
125 }
126
127