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 #ifndef GL_VERSION_3_0
  16 #define GL_NUM_EXTENSIONS 0x821D
  17 #endif
  18
  19 #ifndef GL_VERSION_3_2
  20 #define GL_CONTEXT_CORE_PROFILE_BIT 0x00000001
  21 #define GL_CONTEXT_PROFILE_MASK 0x9126
  22 #endif
  23
  24 using namespace std;
  25
  26 namespace Msp {
  27 namespace GL {
  28
  29 Version::Version()
  30 {
  31         major = 0;
  32         minor = 0;
  33 }
  34
  35 Version::Version(unsigned short a, unsigned short i)
  36 {
  37         major = a;
  38         minor = i;
  39 }
  40
  41 Version::Version(const string &s)
  42 {
  43         vector<string> parts = split(s, '.');
  44         major = lexical_cast<unsigned>(parts[0]);
  45         minor = lexical_cast<unsigned>(parts[1]);
  46 }
  47
  48 bool Version::operator>=(const Version &other) const
  49 {
  50         return major>other.major || (major==other.major && minor>=other.minor);
  51 }
  52
  53
  54 Extension::Extension(const char *n, InitFunc f):
  55         name(n),
  56         init_func(f),
  57         init_done(false),
  58         support(UNSUPPORTED)
  59 { }
  60
  61 Extension::operator bool() const
  62 {
  63         if(!init_done)
  64         {
  65                 support = init_func();
  66                 init_done = true;
  67         }
  68
  69         return support>UNSUPPORTED;
  70 }
  71
  72
  73 Require::Require(const Extension &ext)
  74 {
  75         if(!ext)
  76                 throw unsupported_extension(ext.get_name());
  77 }
  78
  79
  80 bool is_supported(const string &ext)
  81 {
  82         static set<string> extensions;
  83         static bool init_done = false;
  84
  85         if(!init_done)
  86         {
  87                 if(get_gl_api()==OPENGL && get_gl_version()>=Version(3, 0))
  88                 {
  89                         typedef GLubyte *(APIENTRY *FPtr_glGetStringi)(GLenum, GLuint);
  90                         FPtr_glGetStringi glGetStringi = reinterpret_cast<FPtr_glGetStringi>(get_proc_address("glGetStringi"));
  91                         int n_extensions;
  92                         glGetIntegerv(GL_NUM_EXTENSIONS, &n_extensions);
  93                         for(int i=0; i<n_extensions; ++i)
  94                                 extensions.insert(reinterpret_cast<const char *>(glGetStringi(GL_EXTENSIONS, i)));
  95                 }
  96                 else
  97                 {
  98                         if(const char *gl_ext = reinterpret_cast<const char *>(glGetString(GL_EXTENSIONS)))
  99                         {
 100                                 vector<string> exts = split(gl_ext);
 101                                 extensions.insert(exts.begin(), exts.end());
 102                         }
 103                 }
 104
 105                 init_done = true;
 106         }
 107
 108         return extensions.count(ext);
 109 }
 110
 111 bool is_supported(const Version &core_version, const Version &deprecated_version)
 112 {
 113         const Version &version = get_gl_version();
 114         if(deprecated_version && version>=deprecated_version && get_gl_profile()==CORE_PROFILE)
 115                 return false;
 116         return (version>=core_version);
 117 }
 118
 119 bool is_disabled(const string &ext)
 120 {
 121         static set<string> disabled_exts;
 122         static bool init_done = false;
 123
 124         if(!init_done)
 125         {
 126                 if(const char *disable_ptr = getenv("MSPGL_DISABLE_EXTENSIONS"))
 127                 {
 128                         vector<string> disable = split(disable_ptr);
 129                         disabled_exts.insert(disable.begin(), disable.end());
 130                 }
 131
 132                 if(const char *renderer_ptr = reinterpret_cast<const char *>(glGetString(GL_RENDERER)))
 133                 {
 134                         string renderer = renderer_ptr;
 135                         if(renderer.find("Radeon")!=string::npos || renderer.find("AMD")!=string::npos)
 136                         {
 137                                 /* Radeon doesn't process NV_primitive_restart correctly and treats
 138                                 the restart index as a normal element if the indices are stored in a
 139                                 buffer. */
 140                                 disabled_exts.insert("GL_NV_primitive_restart");
 141
 142                                 /* AMD's uniform buffer objects only work with the core version of
 143                                 shaders. */
 144                                 if(get_gl_version()<Version(2, 0))
 145                                         disabled_exts.insert("GL_ARB_uniform_buffer_object");
 146                         }
 147                 }
 148
 149                 init_done = true;
 150         }
 151
 152         return disabled_exts.count(ext);
 153 }
 154
 155 GLApi get_gl_api()
 156 {
 157 #ifdef GL_ES_VERSION_2_0
 158         return OPENGL_ES2;
 159 #else
 160         return OPENGL;
 161 #endif
 162 }
 163
 164 inline GLProfile _get_gl_profile()
 165 {
 166         if(get_gl_api()==OPENGL && get_gl_version()>=Version(3, 0))
 167         {
 168                 int mask;
 169                 glGetIntegerv(GL_CONTEXT_PROFILE_MASK, &mask);
 170                 if(mask==GL_CONTEXT_CORE_PROFILE_BIT)
 171                         return CORE_PROFILE;
 172         }
 173
 174         return COMPATIBILITY_PROFILE;
 175 }
 176
 177 GLProfile get_gl_profile()
 178 {
 179         static GLProfile profile = _get_gl_profile();
 180         return profile;
 181 }
 182
 183 inline Version _get_gl_version()
 184 {
 185         const char *gl_ver_ptr = reinterpret_cast<const char *>(glGetString(GL_VERSION));
 186         if(!gl_ver_ptr)
 187                 throw runtime_error("OpenGL version not available");
 188
 189         string gl_ver = gl_ver_ptr;
 190         if(!gl_ver.compare(0, 10, "OpenGL ES "))
 191                 gl_ver.erase(0, 10);
 192
 193         Version ver(gl_ver.substr(0, gl_ver.find(' ')));
 194
 195         if(const char *force_ver_ptr = getenv("MSPGL_FORCE_VERSION"))
 196         {
 197                 Version force_ver(force_ver_ptr);
 198                 if(!(force_ver>=ver))
 199                         ver = force_ver;
 200         }
 201
 202         return ver;
 203 }
 204
 205 const Version &get_gl_version()
 206 {
 207         static Version version = _get_gl_version();
 208         return version;
 209 }
 210
 211 inline Version _get_glsl_version()
 212 {
 213         const char *glsl_ver_ptr = reinterpret_cast<const char *>(glGetString(GL_SHADING_LANGUAGE_VERSION));
 214         if(!glsl_ver_ptr)
 215                 throw runtime_error("GLSL version not available");
 216
 217         string glsl_ver = glsl_ver_ptr;
 218         if(!glsl_ver.compare(0, 18, "OpenGL ES GLSL ES "))
 219                 glsl_ver.erase(0, 18);
 220
 221         Version ver(glsl_ver.substr(0, glsl_ver.find(' ')));
 222
 223         if(const char *force_ver_ptr = getenv("MSPGL_FORCE_GLSL_VERSION"))
 224         {
 225                 Version force_ver(force_ver_ptr);
 226                 if(!(force_ver>=ver))
 227                         ver = force_ver;
 228         }
 229
 230         return ver;
 231 }
 232
 233 const Version &get_glsl_version()
 234 {
 235         static Version version = _get_glsl_version();
 236         return version;
 237 }
 238
 239 ExtFunc *get_proc_address(const string &name)
 240 {
 241 #if defined(WIN32)
 242         return reinterpret_cast<ExtFunc *>(wglGetProcAddress(name.c_str()));
 243 #elif defined(__APPLE__)
 244         (void)name;
 245         return 0;  // Not supported
 246 #elif defined(__ANDROID__)
 247         return eglGetProcAddress(name.c_str());
 248 #else
 249         return glXGetProcAddressARB(reinterpret_cast<const unsigned char *>(name.c_str()));
 250 #endif
 251 }
 252
 253 } // namespace GL
 254 } // namespace Msp