source/extension.cpp

   1 #include <set>
   2 #ifndef WIN32
   3 #define GLX_GLXEXT_PROTOTYPES
   4 #include <GL/glx.h>
   5 #endif
   6 #include <msp/strings/format.h>
   7 #include <msp/strings/utils.h>
   8 #include "arb_shader_objects.h"
   9 #include "arb_uniform_buffer_object.h"
  10 #include "arb_vertex_buffer_object.h"
  11 #include "arb_vertex_program.h"
  12 #include "arb_vertex_shader.h"
  13 #include "error.h"
  14 #include "ext_framebuffer_blit.h"
  15 #include "ext_framebuffer_multisample.h"
  16 #include "ext_framebuffer_object.h"
  17 #include "extension.h"
  18 #include "gl.h"
  19 #include "nv_primitive_restart.h"
  20 #include "version_1_2.h"
  21 #include "version_1_3.h"
  22
  23 using namespace std;
  24
  25 namespace Msp {
  26 namespace GL {
  27
  28 bool is_supported(const string &ext)
  29 {
  30         static set<string> extensions;
  31         static bool init_done = false;
  32
  33         if(!init_done)
  34         {
  35                 if(const char *gl_ext = reinterpret_cast<const char *>(glGetString(GL_EXTENSIONS)))
  36                 {
  37                         vector<string> exts = split(gl_ext);
  38                         extensions.insert(exts.begin(), exts.end());
  39                 }
  40
  41                 /* XXX Conceptually a bit weird place for this, but I couldn't really come up
  42                    with anything better that would still be transparent. */
  43                 if(extensions.count("GL_ARB_shader_objects"))
  44                         init_arb_shader_objects();
  45                 if(extensions.count("GL_ARB_vertex_shader"))
  46                         init_arb_vertex_shader();
  47                 if(extensions.count("GL_ARB_vertex_program"))
  48                         init_arb_vertex_program();
  49                 if(extensions.count("GL_EXT_framebuffer_object"))
  50                         init_ext_framebuffer_object();
  51                 if(extensions.count("GL_EXT_framebuffer_blit"))
  52                         init_ext_framebuffer_blit();
  53                 if(extensions.count("GL_EXT_framebuffer_multisample"))
  54                         init_ext_framebuffer_multisample();
  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                 if(extensions.count("GL_ARB_uniform_buffer_object"))
  60                         init_arb_uniform_buffer_object();
  61
  62                 init_done = true;
  63         }
  64
  65         return extensions.count(ext);
  66 }
  67
  68 void require_extension(const string &ext)
  69 {
  70         if(!is_supported(ext))
  71                 throw unsupported_extension(ext);
  72 }
  73
  74 const Version &get_gl_version()
  75 {
  76         static Version version;
  77         static bool init_done = false;
  78
  79         if(!init_done)
  80         {
  81                 string gl_ver = reinterpret_cast<const char *>(glGetString(GL_VERSION));
  82                 vector<string> parts = split(gl_ver.substr(0, gl_ver.find(' ')), '.');
  83                 version.major = lexical_cast<unsigned>(parts[0]);
  84                 version.minor = lexical_cast<unsigned>(parts[1]);
  85
  86                 unsigned combined = version.major*0x100+version.minor;
  87                 if(combined>=0x102)
  88                         init_version_1_2();
  89                 if(combined>=0x103)
  90                         init_version_1_3();
  91
  92                 init_done = true;
  93         }
  94
  95         return version;
  96 }
  97
  98 bool is_version_at_least(unsigned a, unsigned b)
  99 {
 100         const Version &ver = get_gl_version();
 101         return (ver.major>a || (ver.major==a && ver.minor>=b));
 102 }
 103
 104 void require_version(unsigned a, unsigned b)
 105 {
 106         if(!is_version_at_least(a, b))
 107                 throw unsupported_extension(format("OpenGL %d.%d", a, b));
 108 }
 109
 110 ExtFunc *get_proc_address(const string &name)
 111 {
 112 #ifndef WIN32
 113         return glXGetProcAddressARB(reinterpret_cast<const unsigned char *>(name.c_str()));
 114 #else
 115         return reinterpret_cast<ExtFunc *>(wglGetProcAddress(name.c_str()));
 116 #endif
 117 }
 118
 119 } // namespace GL
 120 } // namespace Msp