source/extension.cpp

   1 #include <set>
   2 #include <cstdlib>
   3 #if defined(__ANDROID__)
   4 #include <EGL/egl.h>
   5 #elif !defined(WIN32) && !defined(__APPLE__)
   6 #define GLX_GLXEXT_PROTOTYPES
   7 #include <GL/glx.h>
   8 #endif
   9 #include <msp/strings/format.h>
  10 #include <msp/strings/utils.h>
  11 #include "error.h"
  12 #include "extension.h"
  13 #include "gl.h"
  14
  15 using namespace std;
  16
  17 namespace Msp {
  18 namespace GL {
  19
  20 Version::Version()
  21 {
  22         major = 0;
  23         minor = 0;
  24 }
  25
  26 Version::Version(unsigned short a, unsigned short i)
  27 {
  28         major = a;
  29         minor = i;
  30 }
  31
  32 Version::Version(const string &s)
  33 {
  34         vector<string> parts = split(s, '.');
  35         major = lexical_cast<unsigned>(parts[0]);
  36         minor = lexical_cast<unsigned>(parts[1]);
  37 }
  38
  39 bool Version::operator>=(const Version &other) const
  40 {
  41         return major>other.major || (major==other.major && minor>=other.minor);
  42 }
  43
  44
  45 Extension::Extension(const char *n, InitFunc f):
  46         name(n),
  47         init_func(f),
  48         init_done(false),
  49         support(UNSUPPORTED)
  50 { }
  51
  52 Extension::operator bool() const
  53 {
  54         if(!init_done)
  55         {
  56                 support = init_func();
  57                 init_done = true;
  58         }
  59
  60         return support>UNSUPPORTED;
  61 }
  62
  63
  64 Require::Require(const Extension &ext)
  65 {
  66         if(!ext)
  67                 throw unsupported_extension(ext.get_name());
  68 }
  69
  70
  71 bool is_supported(const string &ext)
  72 {
  73         static set<string> extensions;
  74         static bool init_done = false;
  75
  76         if(!init_done)
  77         {
  78                 if(const char *gl_ext = reinterpret_cast<const char *>(glGetString(GL_EXTENSIONS)))
  79                 {
  80                         vector<string> exts = split(gl_ext);
  81                         extensions.insert(exts.begin(), exts.end());
  82                 }
  83
  84                 string renderer = reinterpret_cast<const char *>(glGetString(GL_RENDERER));
  85                 if(renderer.find("Radeon")!=string::npos || renderer.find("AMD")!=string::npos)
  86                 {
  87                         /* Radeon doesn't process NV_primitive_restart correctly and treats
  88                         the restart index as a normal element if the indices are stored in a
  89                         buffer. */
  90                         extensions.erase("GL_NV_primitive_restart");
  91
  92                         /* AMD's uniform buffer objects only work with the core version of
  93                         shaders. */
  94                         if(!(get_gl_version()>=Version(2, 0)))
  95                                 extensions.erase("GL_ARB_uniform_buffer_object");
  96                 }
  97
  98                 if(const char *disable_ptr = getenv("MSPGL_DISABLE_EXTENSIONS"))
  99                 {
 100                         vector<string> disable = split(disable_ptr);
 101                         for(vector<string>::const_iterator i=disable.begin(); i!=disable.end(); ++i)
 102                                 extensions.erase(*i);
 103                 }
 104
 105                 init_done = true;
 106         }
 107
 108         return extensions.count(ext);
 109 }
 110
 111 GLApi get_gl_api()
 112 {
 113 #ifdef GL_ES_VERSION_2_0
 114         return OPENGL_ES2;
 115 #else
 116         return OPENGL;
 117 #endif
 118 }
 119
 120 inline Version _get_gl_version()
 121 {
 122         string gl_ver = reinterpret_cast<const char *>(glGetString(GL_VERSION));
 123         if(!gl_ver.compare(0, 10, "OpenGL ES "))
 124                 gl_ver.erase(0, 10);
 125
 126         Version ver(gl_ver.substr(0, gl_ver.find(' ')));
 127
 128         if(const char *force_ver_ptr = getenv("MSPGL_FORCE_VERSION"))
 129         {
 130                 Version force_ver(force_ver_ptr);
 131                 if(!(force_ver>=ver))
 132                         ver = force_ver;
 133         }
 134
 135         return ver;
 136 }
 137
 138 const Version &get_gl_version()
 139 {
 140         static Version version = _get_gl_version();
 141         return version;
 142 }
 143
 144 inline Version _get_glsl_version()
 145 {
 146         string glsl_ver = reinterpret_cast<const char *>(glGetString(GL_SHADING_LANGUAGE_VERSION));
 147         if(!glsl_ver.compare(0, 18, "OpenGL ES GLSL ES "))
 148                 glsl_ver.erase(0, 18);
 149
 150         Version ver(glsl_ver.substr(0, glsl_ver.find(' ')));
 151
 152         if(const char *force_ver_ptr = getenv("MSPGL_FORCE_GLSL_VERSION"))
 153         {
 154                 Version force_ver(force_ver_ptr);
 155                 if(!(force_ver>=ver))
 156                         ver = force_ver;
 157         }
 158
 159         return ver;
 160 }
 161
 162 const Version &get_glsl_version()
 163 {
 164         static Version version = _get_glsl_version();
 165         return version;
 166 }
 167
 168 bool is_version_at_least(unsigned a, unsigned b)
 169 {
 170         return get_gl_version()>=Version(a, b);
 171 }
 172
 173 ExtFunc *get_proc_address(const string &name)
 174 {
 175 #if defined(WIN32)
 176         return reinterpret_cast<ExtFunc *>(wglGetProcAddress(name.c_str()));
 177 #elif defined(__APPLE__)
 178         (void)name;
 179         return 0;  // Not supported
 180 #elif defined(__ANDROID__)
 181         return eglGetProcAddress(name.c_str());
 182 #else
 183         return glXGetProcAddressARB(reinterpret_cast<const unsigned char *>(name.c_str()));
 184 #endif
 185 }
 186
 187 } // namespace GL
 188 } // namespace Msp