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         if(is_disabled(ext))
  83                 return false;
  84
  85         static set<string> extensions;
  86         static bool init_done = false;
  87
  88         if(!init_done)
  89         {
  90                 if(get_gl_api()==OPENGL && get_gl_version()>=Version(3, 0))
  91                 {
  92                         typedef GLubyte *(APIENTRY *FPtr_glGetStringi)(GLenum, GLuint);
  93                         FPtr_glGetStringi glGetStringi = reinterpret_cast<FPtr_glGetStringi>(get_proc_address("glGetStringi"));
  94                         int n_extensions;
  95                         glGetIntegerv(GL_NUM_EXTENSIONS, &n_extensions);
  96                         for(int i=0; i<n_extensions; ++i)
  97                                 extensions.insert(reinterpret_cast<const char *>(glGetStringi(GL_EXTENSIONS, i)));
  98                 }
  99                 else
 100                 {
 101                         if(const char *gl_ext = reinterpret_cast<const char *>(glGetString(GL_EXTENSIONS)))
 102                         {
 103                                 vector<string> exts = split(gl_ext);
 104                                 extensions.insert(exts.begin(), exts.end());
 105                         }
 106                 }
 107
 108                 init_done = true;
 109         }
 110
 111         return extensions.count(ext);
 112 }
 113
 114 bool is_supported(const Version &core_version, const Version &deprecated_version)
 115 {
 116         const Version &version = get_gl_version();
 117         if(deprecated_version && version>=deprecated_version && get_gl_profile()==CORE_PROFILE)
 118                 return false;
 119         return (version>=core_version);
 120 }
 121
 122 bool is_disabled(const string &ext)
 123 {
 124         static set<string> disabled_exts;
 125         static bool init_done = false;
 126
 127         if(!init_done)
 128         {
 129                 if(const char *disable_ptr = getenv("MSPGL_DISABLE_EXTENSIONS"))
 130                 {
 131                         vector<string> disable = split(disable_ptr);
 132                         disabled_exts.insert(disable.begin(), disable.end());
 133                 }
 134
 135                 if(const char *renderer_ptr = reinterpret_cast<const char *>(glGetString(GL_RENDERER)))
 136                 {
 137                         string renderer = renderer_ptr;
 138                         if(renderer.find("Radeon")!=string::npos || renderer.find("AMD")!=string::npos)
 139                         {
 140                                 /* Radeon doesn't process NV_primitive_restart correctly and treats
 141                                 the restart index as a normal element if the indices are stored in a
 142                                 buffer. */
 143                                 disabled_exts.insert("GL_NV_primitive_restart");
 144
 145                                 // The core primitive restart feature does not work either.
 146                                 disabled_exts.insert("GL_MSP_primitive_restart");
 147
 148                                 /* AMD's uniform buffer objects only work with the core version of
 149                                 shaders. */
 150                                 if(get_gl_version()<Version(2, 0))
 151                                         disabled_exts.insert("GL_ARB_uniform_buffer_object");
 152                         }
 153                 }
 154
 155                 init_done = true;
 156         }
 157
 158         return disabled_exts.count(ext);
 159 }
 160
 161 GLApi get_gl_api()
 162 {
 163 #ifdef GL_ES_VERSION_2_0
 164         return OPENGL_ES2;
 165 #else
 166         return OPENGL;
 167 #endif
 168 }
 169
 170 inline GLProfile _get_gl_profile()
 171 {
 172         if(get_gl_api()==OPENGL && get_gl_version()>=Version(3, 0))
 173         {
 174                 int mask;
 175                 glGetIntegerv(GL_CONTEXT_PROFILE_MASK, &mask);
 176                 if(mask==GL_CONTEXT_CORE_PROFILE_BIT)
 177                         return CORE_PROFILE;
 178         }
 179
 180         return COMPATIBILITY_PROFILE;
 181 }
 182
 183 GLProfile get_gl_profile()
 184 {
 185         static GLProfile profile = _get_gl_profile();
 186         return profile;
 187 }
 188
 189 inline Version _get_gl_version()
 190 {
 191         const char *gl_ver_ptr = reinterpret_cast<const char *>(glGetString(GL_VERSION));
 192         if(!gl_ver_ptr)
 193                 throw runtime_error("OpenGL version not available");
 194
 195         string gl_ver = gl_ver_ptr;
 196         if(!gl_ver.compare(0, 10, "OpenGL ES "))
 197                 gl_ver.erase(0, 10);
 198
 199         Version ver(gl_ver.substr(0, gl_ver.find(' ')));
 200
 201         if(const char *force_ver_ptr = getenv("MSPGL_FORCE_VERSION"))
 202         {
 203                 Version force_ver(force_ver_ptr);
 204                 if(force_ver<ver)
 205                         ver = force_ver;
 206         }
 207
 208         return ver;
 209 }
 210
 211 const Version &get_gl_version()
 212 {
 213         static Version version = _get_gl_version();
 214         return version;
 215 }
 216
 217 inline Version _get_glsl_version()
 218 {
 219         const char *glsl_ver_ptr = reinterpret_cast<const char *>(glGetString(GL_SHADING_LANGUAGE_VERSION));
 220         if(!glsl_ver_ptr)
 221                 throw runtime_error("GLSL version not available");
 222
 223         string glsl_ver = glsl_ver_ptr;
 224         if(!glsl_ver.compare(0, 18, "OpenGL ES GLSL ES "))
 225                 glsl_ver.erase(0, 18);
 226
 227         Version ver(glsl_ver.substr(0, glsl_ver.find(' ')));
 228
 229         if(const char *force_ver_ptr = getenv("MSPGL_FORCE_GLSL_VERSION"))
 230         {
 231                 Version force_ver(force_ver_ptr);
 232                 if(force_ver<ver)
 233                         ver = force_ver;
 234         }
 235
 236         return ver;
 237 }
 238
 239 const Version &get_glsl_version()
 240 {
 241         static Version version = _get_glsl_version();
 242         return version;
 243 }
 244
 245 ExtFunc *get_proc_address(const string &name)
 246 {
 247 #if defined(_WIN32)
 248         return reinterpret_cast<ExtFunc *>(wglGetProcAddress(name.c_str()));
 249 #elif defined(__APPLE__)
 250         (void)name;
 251         return 0;  // Not supported
 252 #elif defined(__ANDROID__)
 253         return eglGetProcAddress(name.c_str());
 254 #else
 255         return glXGetProcAddressARB(reinterpret_cast<const unsigned char *>(name.c_str()));
 256 #endif
 257 }
 258
 259 } // namespace GL
 260 } // namespace Msp