source/extension.cpp

   1 /* $Id$
   2
   3 This file is part of libmspgl
   4 Copyright © 2007, 2009-2010  Mikko Rasa, Mikkosoft Productions
   5 Distributed under the LGPL
   6 */
   7
   8 #include <set>
   9 #ifndef WIN32
  10 #define GLX_GLXEXT_PROTOTYPES
  11 #include <GL/glx.h>
  12 #endif
  13 #include <msp/strings/formatter.h>
  14 #include <msp/strings/utils.h>
  15 #include "arb_shader_objects.h"
  16 #include "arb_vertex_buffer_object.h"
  17 #include "arb_vertex_program.h"
  18 #include "arb_vertex_shader.h"
  19 #include "ext_framebuffer_object.h"
  20 #include "except.h"
  21 #include "extension.h"
  22 #include "gl.h"
  23 #include "version_1_2.h"
  24 #include "version_1_3.h"
  25
  26 using namespace std;
  27
  28 namespace Msp {
  29 namespace GL {
  30
  31 bool is_supported(const string &ext)
  32 {
  33         static set<string> extensions;
  34         static bool init_done = false;
  35
  36         if(!init_done)
  37         {
  38                 if(const char *gl_ext = reinterpret_cast<const char *>(glGetString(GL_EXTENSIONS)))
  39                 {
  40                         vector<string> exts = split(gl_ext);
  41                         extensions.insert(exts.begin(), exts.end());
  42                 }
  43
  44                 /* XXX Conceptually a bit weird place for this, but I couldn't really come up
  45                    with anything better that would still be transparent. */
  46                 if(extensions.count("GL_ARB_shader_objects"))
  47                         init_arb_shader_objects();
  48                 if(extensions.count("GL_ARB_vertex_shader"))
  49                         init_arb_vertex_shader();
  50                 if(extensions.count("GL_ARB_vertex_program"))
  51                         init_arb_vertex_program();
  52                 if(extensions.count("GL_EXT_framebuffer_object"))
  53                         init_ext_framebuffer_object();
  54                 if(extensions.count("GL_ARB_vertex_buffer_object"))
  55                         init_arb_vertex_buffer_object();
  56
  57                 init_done = true;
  58         }
  59
  60         return extensions.count(ext);
  61 }
  62
  63 const Version &get_gl_version()
  64 {
  65         static Version version;
  66         static bool init_done = false;
  67
  68         if(!init_done)
  69         {
  70                 string gl_ver = reinterpret_cast<const char *>(glGetString(GL_VERSION));
  71                 vector<string> parts = split(gl_ver.substr(0, gl_ver.find(' ')), '.');
  72                 version.major = lexical_cast<unsigned>(parts[0]);
  73                 version.minor = lexical_cast<unsigned>(parts[1]);
  74
  75                 unsigned combined = version.major*0x100+version.minor;
  76                 if(combined>=0x102)
  77                         init_version_1_2();
  78                 if(combined>=0x103)
  79                         init_version_1_3();
  80
  81                 init_done = true;
  82         }
  83
  84         return version;
  85 }
  86
  87 void require_extension(const string &ext)
  88 {
  89         if(!is_supported(ext))
  90                 throw UnsupportedExtension(ext);
  91 }
  92
  93 void require_version(unsigned a, unsigned b)
  94 {
  95         const Version &ver = get_gl_version();
  96         if(ver.major<a || (ver.major==a && ver.minor<b))
  97                 throw UnsupportedExtension(format("OpenGL %d.%d", a, b));
  98 }
  99
 100 ExtFunc *get_proc_address(const string &name)
 101 {
 102 #ifndef WIN32
 103         return glXGetProcAddressARB(reinterpret_cast<const unsigned char *>(name.c_str()));
 104 #else
 105         return reinterpret_cast<ExtFunc *>(wglGetProcAddress(name.c_str()));
 106 #endif
 107 }
 108
 109 } // namespace GL
 110 } // namespace Msp