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 "nv_primitive_restart.h"
  24 #include "version_1_2.h"
  25 #include "version_1_3.h"
  26
  27 using namespace std;
  28
  29 namespace Msp {
  30 namespace GL {
  31
  32 bool is_supported(const string &ext)
  33 {
  34         static set<string> extensions;
  35         static bool init_done = false;
  36
  37         if(!init_done)
  38         {
  39                 if(const char *gl_ext = reinterpret_cast<const char *>(glGetString(GL_EXTENSIONS)))
  40                 {
  41                         vector<string> exts = split(gl_ext);
  42                         extensions.insert(exts.begin(), exts.end());
  43                 }
  44
  45                 /* XXX Conceptually a bit weird place for this, but I couldn't really come up
  46                    with anything better that would still be transparent. */
  47                 if(extensions.count("GL_ARB_shader_objects"))
  48                         init_arb_shader_objects();
  49                 if(extensions.count("GL_ARB_vertex_shader"))
  50                         init_arb_vertex_shader();
  51                 if(extensions.count("GL_ARB_vertex_program"))
  52                         init_arb_vertex_program();
  53                 if(extensions.count("GL_EXT_framebuffer_object"))
  54                         init_ext_framebuffer_object();
  55                 if(extensions.count("GL_ARB_vertex_buffer_object"))
  56                         init_arb_vertex_buffer_object();
  57                 if(extensions.count("GL_NV_primitive_restart"))
  58                         init_nv_primitive_restart();
  59
  60                 init_done = true;
  61         }
  62
  63         return extensions.count(ext);
  64 }
  65
  66 void require_extension(const string &ext)
  67 {
  68         if(!is_supported(ext))
  69                 throw UnsupportedExtension(ext);
  70 }
  71
  72 const Version &get_gl_version()
  73 {
  74         static Version version;
  75         static bool init_done = false;
  76
  77         if(!init_done)
  78         {
  79                 string gl_ver = reinterpret_cast<const char *>(glGetString(GL_VERSION));
  80                 vector<string> parts = split(gl_ver.substr(0, gl_ver.find(' ')), '.');
  81                 version.major = lexical_cast<unsigned>(parts[0]);
  82                 version.minor = lexical_cast<unsigned>(parts[1]);
  83
  84                 unsigned combined = version.major*0x100+version.minor;
  85                 if(combined>=0x102)
  86                         init_version_1_2();
  87                 if(combined>=0x103)
  88                         init_version_1_3();
  89
  90                 init_done = true;
  91         }
  92
  93         return version;
  94 }
  95
  96 bool is_version_at_least(unsigned a, unsigned b)
  97 {
  98         const Version &ver = get_gl_version();
  99         return (ver.major>a || (ver.major==a && ver.minor>=b));
 100 }
 101
 102 void require_version(unsigned a, unsigned b)
 103 {
 104         if(!is_version_at_least(a, b))
 105                 throw UnsupportedExtension(format("OpenGL %d.%d", a, b));
 106 }
 107
 108 ExtFunc *get_proc_address(const string &name)
 109 {
 110 #ifndef WIN32
 111         return glXGetProcAddressARB(reinterpret_cast<const unsigned char *>(name.c_str()));
 112 #else
 113         return reinterpret_cast<ExtFunc *>(wglGetProcAddress(name.c_str()));
 114 #endif
 115 }
 116
 117 } // namespace GL
 118 } // namespace Msp