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(get_gl_api()==OPENGL && get_gl_version()>=Version(3, 0))
  79                 {
  80                         typedef GLubyte *(APIENTRY *FPtr_glGetStringi)(GLenum, GLuint);
  81                         FPtr_glGetStringi glGetStringi = reinterpret_cast<FPtr_glGetStringi>(get_proc_address("glGetStringi"));
  82                         int n_extensions;
  83                         glGetIntegerv(GL_NUM_EXTENSIONS, &n_extensions);
  84                         for(int i=0; i<n_extensions; ++i)
  85                                 extensions.insert(reinterpret_cast<const char *>(glGetStringi(GL_EXTENSIONS, i)));
  86                 }
  87                 else
  88                 {
  89                         if(const char *gl_ext = reinterpret_cast<const char *>(glGetString(GL_EXTENSIONS)))
  90                         {
  91                                 vector<string> exts = split(gl_ext);
  92                                 extensions.insert(exts.begin(), exts.end());
  93                         }
  94                 }
  95
  96                 init_done = true;
  97         }
  98
  99         return extensions.count(ext);
 100 }
 101
 102 bool is_supported(const Version &core_version, const Version &deprecated_version)
 103 {
 104         const Version &version = get_gl_version();
 105         if(deprecated_version && version>=deprecated_version && get_gl_profile()==CORE_PROFILE)
 106                 return false;
 107         return (version>=core_version);
 108 }
 109
 110 bool is_disabled(const string &ext)
 111 {
 112         static set<string> disabled_exts;
 113         static bool init_done = false;
 114
 115         if(!init_done)
 116         {
 117                 if(const char *disable_ptr = getenv("MSPGL_DISABLE_EXTENSIONS"))
 118                 {
 119                         vector<string> disable = split(disable_ptr);
 120                         disabled_exts.insert(disable.begin(), disable.end());
 121                 }
 122
 123                 if(const char *renderer_ptr = reinterpret_cast<const char *>(glGetString(GL_RENDERER)))
 124                 {
 125                         string renderer = renderer_ptr;
 126                         if(renderer.find("Radeon")!=string::npos || renderer.find("AMD")!=string::npos)
 127                         {
 128                                 /* Radeon doesn't process NV_primitive_restart correctly and treats
 129                                 the restart index as a normal element if the indices are stored in a
 130                                 buffer. */
 131                                 disabled_exts.insert("GL_NV_primitive_restart");
 132
 133                                 /* AMD's uniform buffer objects only work with the core version of
 134                                 shaders. */
 135                                 if(get_gl_version()<Version(2, 0))
 136                                         disabled_exts.insert("GL_ARB_uniform_buffer_object");
 137                         }
 138                 }
 139
 140                 init_done = true;
 141         }
 142
 143         return disabled_exts.count(ext);
 144 }
 145
 146 GLApi get_gl_api()
 147 {
 148 #ifdef GL_ES_VERSION_2_0
 149         return OPENGL_ES2;
 150 #else
 151         return OPENGL;
 152 #endif
 153 }
 154
 155 inline GLProfile _get_gl_profile()
 156 {
 157         if(get_gl_api()==OPENGL && get_gl_version()>=Version(3, 0))
 158         {
 159                 int mask;
 160                 glGetIntegerv(GL_CONTEXT_PROFILE_MASK, &mask);
 161                 if(mask==GL_CONTEXT_CORE_PROFILE_BIT)
 162                         return CORE_PROFILE;
 163         }
 164
 165         return COMPATIBILITY_PROFILE;
 166 }
 167
 168 GLProfile get_gl_profile()
 169 {
 170         static GLProfile profile = _get_gl_profile();
 171         return profile;
 172 }
 173
 174 inline Version _get_gl_version()
 175 {
 176         const char *gl_ver_ptr = reinterpret_cast<const char *>(glGetString(GL_VERSION));
 177         if(!gl_ver_ptr)
 178                 throw runtime_error("OpenGL version not available");
 179
 180         string gl_ver = gl_ver_ptr;
 181         if(!gl_ver.compare(0, 10, "OpenGL ES "))
 182                 gl_ver.erase(0, 10);
 183
 184         Version ver(gl_ver.substr(0, gl_ver.find(' ')));
 185
 186         if(const char *force_ver_ptr = getenv("MSPGL_FORCE_VERSION"))
 187         {
 188                 Version force_ver(force_ver_ptr);
 189                 if(!(force_ver>=ver))
 190                         ver = force_ver;
 191         }
 192
 193         return ver;
 194 }
 195
 196 const Version &get_gl_version()
 197 {
 198         static Version version = _get_gl_version();
 199         return version;
 200 }
 201
 202 inline Version _get_glsl_version()
 203 {
 204         const char *glsl_ver_ptr = reinterpret_cast<const char *>(glGetString(GL_SHADING_LANGUAGE_VERSION));
 205         if(!glsl_ver_ptr)
 206                 throw runtime_error("GLSL version not available");
 207
 208         string glsl_ver = glsl_ver_ptr;
 209         if(!glsl_ver.compare(0, 18, "OpenGL ES GLSL ES "))
 210                 glsl_ver.erase(0, 18);
 211
 212         Version ver(glsl_ver.substr(0, glsl_ver.find(' ')));
 213
 214         if(const char *force_ver_ptr = getenv("MSPGL_FORCE_GLSL_VERSION"))
 215         {
 216                 Version force_ver(force_ver_ptr);
 217                 if(!(force_ver>=ver))
 218                         ver = force_ver;
 219         }
 220
 221         return ver;
 222 }
 223
 224 const Version &get_glsl_version()
 225 {
 226         static Version version = _get_glsl_version();
 227         return version;
 228 }
 229
 230 ExtFunc *get_proc_address(const string &name)
 231 {
 232 #if defined(WIN32)
 233         return reinterpret_cast<ExtFunc *>(wglGetProcAddress(name.c_str()));
 234 #elif defined(__APPLE__)
 235         (void)name;
 236         return 0;  // Not supported
 237 #elif defined(__ANDROID__)
 238         return eglGetProcAddress(name.c_str());
 239 #else
 240         return glXGetProcAddressARB(reinterpret_cast<const unsigned char *>(name.c_str()));
 241 #endif
 242 }
 243
 244 } // namespace GL
 245 } // namespace Msp