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 #ifndef WIN32
  10 #include <GL/glx.h>
  11 #endif
  12 #include <msp/strings/formatter.h>
  13 #include <msp/strings/utils.h>
  14 #include "arb_shader_objects.h"
  15 #include "arb_vertex_buffer_object.h"
  16 #include "arb_vertex_program.h"
  17 #include "arb_vertex_shader.h"
  18 #include "ext_framebuffer_object.h"
  19 #include "except.h"
  20 #include "extension.h"
  21 #include "gl.h"
  22 #include "version_1_2.h"
  23 #include "version_1_3.h"
  24
  25 using namespace std;
  26
  27 namespace Msp {
  28 namespace GL {
  29
  30 bool is_supported(const string &ext)
  31 {
  32         static set<string> extensions;
  33         static bool init_done=false;
  34
  35         if(!init_done)
  36         {
  37                 if(const char *gl_ext=reinterpret_cast<const char *>(glGetString(GL_EXTENSIONS)))
  38                 {
  39                         vector<string> exts=split(gl_ext);
  40                         extensions.insert(exts.begin(), exts.end());
  41                 }
  42
  43                 /* XXX Conceptually a bit weird place for this, but I couldn't really come up
  44                    with anything better that would still be transparent. */
  45                 if(extensions.count("GL_ARB_shader_objects"))
  46                         init_arb_shader_objects();
  47                 if(extensions.count("GL_ARB_vertex_shader"))
  48                         init_arb_vertex_shader();
  49                 if(extensions.count("GL_ARB_vertex_program"))
  50                         init_arb_vertex_program();
  51                 if(extensions.count("GL_EXT_framebuffer_object"))
  52                         init_ext_framebuffer_object();
  53                 if(extensions.count("GL_ARB_vertex_buffer_object"))
  54                         init_arb_vertex_buffer_object();
  55
  56                 init_done=true;
  57         }
  58
  59         return extensions.count(ext);
  60 }
  61
  62 const Version &get_gl_version()
  63 {
  64         static Version version;
  65         static bool init_done=false;
  66
  67         if(!init_done)
  68         {
  69                 string gl_ver=reinterpret_cast<const char *>(glGetString(GL_VERSION));
  70                 vector<string> parts=split(gl_ver.substr(0, gl_ver.find(' ')), '.');
  71                 version.major=lexical_cast<unsigned>(parts[0]);
  72                 version.minor=lexical_cast<unsigned>(parts[1]);
  73
  74                 unsigned combined=version.major*0x100+version.minor;
  75                 if(combined>=0x102)
  76                         init_version_1_2();
  77                 if(combined>=0x103)
  78                         init_version_1_3();
  79
  80                 init_done = true;
  81         }
  82
  83         return version;
  84 }
  85
  86 void require_extension(const string &ext)
  87 {
  88         if(!is_supported(ext))
  89                 throw UnsupportedExtension(ext);
  90 }
  91
  92 void require_version(unsigned a, unsigned b)
  93 {
  94         const Version &ver=get_gl_version();
  95         if(ver.major<a || (ver.major==a && ver.minor<b))
  96                 throw UnsupportedExtension(format("OpenGL %d.%d", a, b));
  97 }
  98
  99 ExtFunc *get_proc_address(const string &name)
 100 {
 101 #ifndef WIN32
 102         return glXGetProcAddressARB(reinterpret_cast<const GLubyte *>(name.c_str()));
 103 #else
 104         return reinterpret_cast<ExtFunc *>(wglGetProcAddress(name.c_str()));
 105 #endif
 106 }
 107
 108 } // namespace GL
 109 } // namespace Msp