source/extension.cpp

   1 /* $Id$
   2
   3 This file is part of libmspgl
   4 Copyright © 2007, 2009-2011  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_blit.h"
  20 #include "ext_framebuffer_multisample.h"
  21 #include "ext_framebuffer_object.h"
  22 #include "except.h"
  23 #include "extension.h"
  24 #include "gl.h"
  25 #include "nv_primitive_restart.h"
  26 #include "version_1_2.h"
  27 #include "version_1_3.h"
  28
  29 using namespace std;
  30
  31 namespace Msp {
  32 namespace GL {
  33
  34 bool is_supported(const string &ext)
  35 {
  36         static set<string> extensions;
  37         static bool init_done = false;
  38
  39         if(!init_done)
  40         {
  41                 if(const char *gl_ext = reinterpret_cast<const char *>(glGetString(GL_EXTENSIONS)))
  42                 {
  43                         vector<string> exts = split(gl_ext);
  44                         extensions.insert(exts.begin(), exts.end());
  45                 }
  46
  47                 /* XXX Conceptually a bit weird place for this, but I couldn't really come up
  48                    with anything better that would still be transparent. */
  49                 if(extensions.count("GL_ARB_shader_objects"))
  50                         init_arb_shader_objects();
  51                 if(extensions.count("GL_ARB_vertex_shader"))
  52                         init_arb_vertex_shader();
  53                 if(extensions.count("GL_ARB_vertex_program"))
  54                         init_arb_vertex_program();
  55                 if(extensions.count("GL_EXT_framebuffer_object"))
  56                         init_ext_framebuffer_object();
  57                 if(extensions.count("GL_EXT_framebuffer_blit"))
  58                         init_ext_framebuffer_blit();
  59                 if(extensions.count("GL_EXT_framebuffer_multisample"))
  60                         init_ext_framebuffer_multisample();
  61                 if(extensions.count("GL_ARB_vertex_buffer_object"))
  62                         init_arb_vertex_buffer_object();
  63                 if(extensions.count("GL_NV_primitive_restart"))
  64                         init_nv_primitive_restart();
  65
  66                 init_done = true;
  67         }
  68
  69         return extensions.count(ext);
  70 }
  71
  72 void require_extension(const string &ext)
  73 {
  74         if(!is_supported(ext))
  75                 throw UnsupportedExtension(ext);
  76 }
  77
  78 const Version &get_gl_version()
  79 {
  80         static Version version;
  81         static bool init_done = false;
  82
  83         if(!init_done)
  84         {
  85                 string gl_ver = reinterpret_cast<const char *>(glGetString(GL_VERSION));
  86                 vector<string> parts = split(gl_ver.substr(0, gl_ver.find(' ')), '.');
  87                 version.major = lexical_cast<unsigned>(parts[0]);
  88                 version.minor = lexical_cast<unsigned>(parts[1]);
  89
  90                 unsigned combined = version.major*0x100+version.minor;
  91                 if(combined>=0x102)
  92                         init_version_1_2();
  93                 if(combined>=0x103)
  94                         init_version_1_3();
  95
  96                 init_done = true;
  97         }
  98
  99         return version;
 100 }
 101
 102 bool is_version_at_least(unsigned a, unsigned b)
 103 {
 104         const Version &ver = get_gl_version();
 105         return (ver.major>a || (ver.major==a && ver.minor>=b));
 106 }
 107
 108 void require_version(unsigned a, unsigned b)
 109 {
 110         if(!is_version_at_least(a, b))
 111                 throw UnsupportedExtension(format("OpenGL %d.%d", a, b));
 112 }
 113
 114 ExtFunc *get_proc_address(const string &name)
 115 {
 116 #ifndef WIN32
 117         return glXGetProcAddressARB(reinterpret_cast<const unsigned char *>(name.c_str()));
 118 #else
 119         return reinterpret_cast<ExtFunc *>(wglGetProcAddress(name.c_str()));
 120 #endif
 121 }
 122
 123 } // namespace GL
 124 } // namespace Msp