source/extension.cpp

   1 #include <set>
   2 #if !defined(WIN32) && !defined(__APPLE__)
   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 "error.h"
   9 #include "extension.h"
  10 #include "gl.h"
  11
  12 using namespace std;
  13
  14 namespace Msp {
  15 namespace GL {
  16
  17 Version::Version()
  18 {
  19         major = 0;
  20         minor = 0;
  21 }
  22
  23 Version::Version(unsigned short a, unsigned short i)
  24 {
  25         major = a;
  26         minor = i;
  27 }
  28
  29 Version::Version(const string &s)
  30 {
  31         vector<string> parts = split(s, '.');
  32         major = lexical_cast<unsigned>(parts[0]);
  33         minor = lexical_cast<unsigned>(parts[1]);
  34 }
  35
  36 bool Version::operator>=(const Version &other) const
  37 {
  38         return major>other.major || (major==other.major && minor>=other.minor);
  39 }
  40
  41
  42 Extension::Extension(const char *n, InitFunc f):
  43         name(n),
  44         init_func(f),
  45         init_done(false),
  46         support(UNSUPPORTED)
  47 { }
  48
  49 Extension::operator bool() const
  50 {
  51         if(!init_done)
  52         {
  53                 support = init_func();
  54                 init_done = true;
  55         }
  56
  57         return support>UNSUPPORTED;
  58 }
  59
  60
  61 Require::Require(const Extension &ext)
  62 {
  63         if(!ext)
  64                 throw unsupported_extension(ext.get_name());
  65 }
  66
  67
  68 bool is_supported(const string &ext)
  69 {
  70         static set<string> extensions;
  71         static bool init_done = false;
  72
  73         if(!init_done)
  74         {
  75                 if(const char *gl_ext = reinterpret_cast<const char *>(glGetString(GL_EXTENSIONS)))
  76                 {
  77                         vector<string> exts = split(gl_ext);
  78                         extensions.insert(exts.begin(), exts.end());
  79                 }
  80
  81                 string renderer = reinterpret_cast<const char *>(glGetString(GL_RENDERER));
  82                 if(renderer.find("Radeon")!=string::npos)
  83                 {
  84                         /* Radeon doesn't process NV_primitive_restart correctly and treats
  85                         the restart index as a normal element if the indices are stored in a
  86                         buffer. */
  87                         extensions.erase("GL_NV_primitive_restart");
  88
  89                         /* AMD's uniform buffer objects only work with the core version of
  90                         shaders. */
  91                         if(!(get_gl_version()>=Version(2, 0)))
  92                                 extensions.erase("GL_ARB_uniform_buffer_object");
  93                 }
  94
  95                 if(const char *disable_ptr = getenv("MSPGL_DISABLE_EXTENSIONS"))
  96                 {
  97                         vector<string> disable = split(disable_ptr);
  98                         for(vector<string>::const_iterator i=disable.begin(); i!=disable.end(); ++i)
  99                                 extensions.erase(*i);
 100                 }
 101
 102                 init_done = true;
 103         }
 104
 105         return extensions.count(ext);
 106 }
 107
 108 inline Version _get_gl_version()
 109 {
 110         string gl_ver = reinterpret_cast<const char *>(glGetString(GL_VERSION));
 111         Version ver(gl_ver.substr(0, gl_ver.find(' ')));
 112
 113         if(const char *force_ver_ptr = getenv("MSPGL_FORCE_VERSION"))
 114         {
 115                 Version force_ver(force_ver_ptr);
 116                 if(!(force_ver>=ver))
 117                         ver = force_ver;
 118         }
 119
 120         return ver;
 121 }
 122
 123 const Version &get_gl_version()
 124 {
 125         static Version version = _get_gl_version();
 126         return version;
 127 }
 128
 129 inline Version _get_glsl_version()
 130 {
 131         string glsl_ver = reinterpret_cast<const char *>(glGetString(GL_SHADING_LANGUAGE_VERSION));
 132         Version ver(glsl_ver.substr(0, glsl_ver.find(' ')));
 133
 134         if(const char *force_ver_ptr = getenv("MSPGL_FORCE_GLSL_VERSION"))
 135         {
 136                 Version force_ver(force_ver_ptr);
 137                 if(!(force_ver>=ver))
 138                         ver = force_ver;
 139         }
 140
 141         return ver;
 142 }
 143
 144 const Version &get_glsl_version()
 145 {
 146         static Version version = _get_glsl_version();
 147         return version;
 148 }
 149
 150 bool is_version_at_least(unsigned a, unsigned b)
 151 {
 152         return get_gl_version()>=Version(a, b);
 153 }
 154
 155 ExtFunc *get_proc_address(const string &name)
 156 {
 157 #if defined(WIN32)
 158         return reinterpret_cast<ExtFunc *>(wglGetProcAddress(name.c_str()));
 159 #elif defined(__APPLE__)
 160         (void)name;
 161         return 0;  // Not supported
 162 #else
 163         return glXGetProcAddressARB(reinterpret_cast<const unsigned char *>(name.c_str()));
 164 #endif
 165 }
 166
 167 } // namespace GL
 168 } // namespace Msp