src/client/GLEXT/GLVertexBufferObject.cpp

   1 ////////////////////////////////////////////////////////////////////////////////
   2 //    Scorched3D (c) 2000-2009
   3 //
   4 //    This file is part of Scorched3D.
   5 //
   6 //    Scorched3D is free software; you can redistribute it and/or modify
   7 //    it under the terms of the GNU General Public License as published by
   8 //    the Free Software Foundation; either version 2 of the License, or
   9 //    (at your option) any later version.
  10 //
  11 //    Scorched3D is distributed in the hope that it will be useful,
  12 //    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 //    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 //    GNU General Public License for more details.
  15 //
  16 //    You should have received a copy of the GNU General Public License
  17 //    along with Scorched3D; if not, write to the Free Software
  18 //    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19 ////////////////////////////////////////////////////////////////////////////////
  20
  21 #include <GLEXT/GLVertexBufferObject.h>
  22 #include <GLEXT/GLStateExtension.h>
  23 #include <common/DefinesAssert.h>
  24 #include <common/Logger.h>
  25
  26 GLVertexBufferObject::GLVertexBufferObject(bool indexbuffer) :
  27         id_(0), size_(0), mapped_(false),
  28         target_(indexbuffer ? GL_ELEMENT_ARRAY_BUFFER_ARB : GL_ARRAY_BUFFER_ARB)
  29 {
  30         DIALOG_ASSERT(GLStateExtension::hasVBO());
  31
  32         glGenBuffersARB(1, &id_);
  33 }
  34
  35 GLVertexBufferObject::~GLVertexBufferObject()
  36 {
  37         if (mapped_) unmap();
  38         glDeleteBuffersARB(1, &id_);
  39 }
  40
  41 void GLVertexBufferObject::init_data(unsigned size, const void* data, int usage)
  42 {
  43         size_ = size;
  44         bind();
  45         glBufferDataARB(target_, size_, data, usage);
  46         unbind();
  47 }
  48
  49 void GLVertexBufferObject::init_sub_data(unsigned offset, unsigned subsize, const void* data)
  50 {
  51         bind();
  52         glBufferSubDataARB(target_, offset, subsize, data);
  53         unbind();
  54 }
  55
  56 void GLVertexBufferObject::bind() const
  57 {
  58         glBindBufferARB(target_, id_);
  59 }
  60
  61 void GLVertexBufferObject::unbind() const
  62 {
  63         glBindBufferARB(target_, 0);
  64 }
  65
  66 void* GLVertexBufferObject::map(int access)
  67 {
  68         DIALOG_ASSERT(!mapped_); //("vertex buffer object mapped twice");
  69         bind();
  70         void* addr = glMapBufferARB(target_, access);
  71         DIALOG_ASSERT(addr); // ("vertex buffer object mapping failed");
  72         mapped_ = true;
  73
  74         return addr;
  75 }
  76
  77 void GLVertexBufferObject::unmap()
  78 {
  79         DIALOG_ASSERT(mapped_) //("vertex buffer object not mapped before unmap()");
  80         mapped_ = false;
  81         bind();
  82
  83         if (glUnmapBufferARB(target_) != GL_TRUE)
  84         {
  85                 Logger::log("failed to unmap Vertex Buffer object, data invalid");
  86         }
  87 }