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      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 
     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 
     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 
     41 void GrGLVertexBuffer::onAbandon() {
     42     fBufferID = 0;
     43     fLockPtr = NULL;
     44 }
     45 
     46 void GrGLVertexBuffer::bind() const {
     47     GR_GL(BindBuffer(GR_GL_ARRAY_BUFFER, fBufferID));
     48     GPUGL->notifyVertexBufferBind(this);
     49 }
     50 
     51 GrGLuint GrGLVertexBuffer::bufferID() const {
     52     return fBufferID;
     53 }
     54 
     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 
     69 void* GrGLVertexBuffer::lockPtr() const {
     70     return fLockPtr;
     71 }
     72 
     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 
     84 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 
     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 
    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