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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 "GrGLIndexBuffer.h"
     19 #include "GrGpuGL.h"
     20 
     21 #define GPUGL static_cast<GrGpuGL*>(getGpu())
     22 
     23 GrGLIndexBuffer::GrGLIndexBuffer(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 
     33 void GrGLIndexBuffer::onRelease() {
     34     // make sure we've not been abandoned
     35     if (fBufferID) {
     36         GPUGL->notifyIndexBufferDelete(this);
     37         GR_GL(DeleteBuffers(1, &fBufferID));
     38         fBufferID = 0;
     39     }
     40 }
     41 
     42 void GrGLIndexBuffer::onAbandon() {
     43     fBufferID = 0;
     44     fLockPtr = NULL;
     45 }
     46 
     47 void GrGLIndexBuffer::bind() const {
     48     GR_GL(BindBuffer(GR_GL_ELEMENT_ARRAY_BUFFER, fBufferID));
     49     GPUGL->notifyIndexBufferBind(this);
     50 }
     51 
     52 GrGLuint GrGLIndexBuffer::bufferID() const {
     53     return fBufferID;
     54 }
     55 
     56 void* GrGLIndexBuffer::lock() {
     57     GrAssert(fBufferID);
     58     GrAssert(!isLocked());
     59     if (GPUGL->supportsBufferLocking()) {
     60         this->bind();
     61         // Let driver know it can discard the old data
     62         GR_GL(BufferData(GR_GL_ELEMENT_ARRAY_BUFFER, size(), NULL,
     63                          dynamic() ? GR_GL_DYNAMIC_DRAW : GR_GL_STATIC_DRAW));
     64         fLockPtr = GR_GL(MapBuffer(GR_GL_ELEMENT_ARRAY_BUFFER, GR_GL_WRITE_ONLY));
     65 
     66         return fLockPtr;
     67     }
     68     return NULL;
     69 }
     70 
     71 void* GrGLIndexBuffer::lockPtr() const {
     72     return fLockPtr;
     73 }
     74 
     75 void GrGLIndexBuffer::unlock() {
     76     GrAssert(fBufferID);
     77     GrAssert(isLocked());
     78     GrAssert(GPUGL->supportsBufferLocking());
     79 
     80     this->bind();
     81     GR_GL(UnmapBuffer(GR_GL_ELEMENT_ARRAY_BUFFER));
     82     fLockPtr = NULL;
     83 }
     84 
     85 bool GrGLIndexBuffer::isLocked() const {
     86 #if GR_DEBUG
     87     if (this->isValid() && GPUGL->supportsBufferLocking()) {
     88         this->bind();
     89         GrGLint mapped;
     90         GR_GL(GetBufferParameteriv(GR_GL_ELEMENT_ARRAY_BUFFER,
     91                                    GR_GL_BUFFER_MAPPED, &mapped));
     92         GrAssert(!!mapped == !!fLockPtr);
     93     }
     94 #endif
     95     return NULL != fLockPtr;
     96 }
     97 
     98 bool GrGLIndexBuffer::updateData(const void* src, size_t srcSizeInBytes) {
     99     GrAssert(fBufferID);
    100     GrAssert(!isLocked());
    101     if (srcSizeInBytes > size()) {
    102         return false;
    103     }
    104     this->bind();
    105     GrGLenum usage = dynamic() ? GR_GL_DYNAMIC_DRAW : GR_GL_STATIC_DRAW;
    106     if (size() == srcSizeInBytes) {
    107         GR_GL(BufferData(GR_GL_ELEMENT_ARRAY_BUFFER, srcSizeInBytes, src, usage));
    108     } else {
    109         GR_GL(BufferData(GR_GL_ELEMENT_ARRAY_BUFFER, size(), NULL, usage));
    110         GR_GL(BufferSubData(GR_GL_ELEMENT_ARRAY_BUFFER, 0, srcSizeInBytes, src));
    111     }
    112     return true;
    113 }
    114 
    115 bool GrGLIndexBuffer::updateSubData(const void* src,
    116                                     size_t srcSizeInBytes,
    117                                     size_t offset) {
    118     GrAssert(fBufferID);
    119     GrAssert(!isLocked());
    120     if (srcSizeInBytes + offset > size()) {
    121         return false;
    122     }
    123     this->bind();
    124     GR_GL(BufferSubData(GR_GL_ELEMENT_ARRAY_BUFFER, offset, srcSizeInBytes, src));
    125     return true;
    126 }
    127 
    128