source/extension.cpp

   1 /* $Id$
   2
   3 This file is part of libmspgl
   4 Copyright © 2007  Mikko Rasa, Mikkosoft Productions
   5 Distributed under the LGPL
   6 */
   7
   8 #include <set>
   9 #include <GL/gl.h>
  10 #ifndef WIN32
  11 #include <GL/glx.h>
  12 #endif
  13 #include <msp/strings/utils.h>
  14 #include "arb_shader_objects.h"
  15 #include "arb_vertex_shader.h"
  16 #include "ext_framebuffer_object.h"
  17 #include "except.h"
  18 #include "extension.h"
  19
  20 using namespace std;
  21
  22 namespace Msp {
  23 namespace GL {
  24
  25 bool is_supported(const string &ext)
  26 {
  27         static set<string> extensions;
  28         static bool init_done=false;
  29
  30         if(!init_done)
  31         {
  32                 if(const char *gl_ext=reinterpret_cast<const char *>(glGetString(GL_EXTENSIONS)))
  33                 {
  34                         vector<string> exts=split(gl_ext);
  35                         extensions.insert(exts.begin(), exts.end());
  36                 }
  37
  38                 /* XXX Conceptually a bit weird place for this, but I couldn't really come up
  39                    with anything better that would still be transparent. */
  40                 if(extensions.count("GL_ARB_shader_objects"))
  41                         init_arb_shader_objects();
  42                 if(extensions.count("GL_ARB_vertex_shader"))
  43                         init_arb_vertex_shader();
  44                 if(extensions.count("GL_EXT_framebuffer_object"))
  45                         init_ext_framebuffer_object();
  46
  47                 init_done=true;
  48         }
  49
  50         return extensions.count(ext);
  51 }
  52
  53 void require_extension(const string &ext)
  54 {
  55         if(!is_supported(ext))
  56                 throw UnsupportedExtension(ext+" is not supported");
  57 }
  58
  59 ExtFunc *get_proc_address(const string &name)
  60 {
  61 #ifndef WIN32
  62         return glXGetProcAddressARB(reinterpret_cast<const GLubyte *>(name.c_str()));
  63 #endif
  64 }
  65
  66 } // namespace GL
  67 } // namespace Msp