source/extension.cpp

   1 #include <set>
   2 #include <cstdlib>
   3 #if defined(__ANDROID__)
   4 #include <EGL/egl.h>
   5 #elif defined(_WIN32)
   6 #include <windows.h>
   7 #elif !defined(__APPLE__)
   8 #define GLX_GLXEXT_PROTOTYPES
   9 #include <GL/glx.h>
  10 #endif
  11 #include <msp/strings/format.h>
  12 #include <msp/strings/utils.h>
  13 #include "error.h"
  14 #include "extension.h"
  15 #include "gl.h"
  16
  17 #ifndef GL_VERSION_3_0
  18 #define GL_NUM_EXTENSIONS 0x821D
  19 #endif
  20
  21 #ifndef GL_VERSION_3_2
  22 #define GL_CONTEXT_CORE_PROFILE_BIT 0x00000001
  23 #define GL_CONTEXT_PROFILE_MASK 0x9126
  24 #endif
  25
  26 using namespace std;
  27
  28 namespace Msp {
  29 namespace GL {
  30
  31 Version::Version()
  32 {
  33         major = 0;
  34         minor = 0;
  35 }
  36
  37 Version::Version(unsigned short a, unsigned short i)
  38 {
  39         major = a;
  40         minor = i;
  41 }
  42
  43 Version::Version(const string &s)
  44 {
  45         vector<string> parts = split(s, '.');
  46         major = lexical_cast<unsigned>(parts[0]);
  47         minor = lexical_cast<unsigned>(parts[1]);
  48 }
  49
  50 bool Version::operator>=(const Version &other) const
  51 {
  52         return major>other.major || (major==other.major && minor>=other.minor);
  53 }
  54
  55
  56 Extension::Extension(const char *n, InitFunc f):
  57         name(n),
  58         init_func(f),
  59         init_done(false),
  60         support(UNSUPPORTED)
  61 { }
  62
  63 Extension::operator bool() const
  64 {
  65         if(!init_done)
  66         {
  67                 support = init_func();
  68                 init_done = true;
  69         }
  70
  71         return support>UNSUPPORTED;
  72 }
  73
  74
  75 Require::Require(const Extension &ext)
  76 {
  77         if(!ext)
  78                 throw unsupported_extension(ext.get_name());
  79 }
  80
  81
  82 bool is_supported(const string &ext)
  83 {
  84         if(is_disabled(ext))
  85                 return false;
  86
  87         static set<string> extensions;
  88         static bool init_done = false;
  89
  90         if(!init_done)
  91         {
  92                 if(get_gl_api()==OPENGL && get_gl_version()>=Version(3, 0))
  93                 {
  94                         typedef GLubyte *(APIENTRY *FPtr_glGetStringi)(GLenum, GLuint);
  95                         FPtr_glGetStringi glGetStringi = reinterpret_cast<FPtr_glGetStringi>(get_proc_address("glGetStringi"));
  96                         int n_extensions;
  97                         glGetIntegerv(GL_NUM_EXTENSIONS, &n_extensions);
  98                         for(int i=0; i<n_extensions; ++i)
  99                                 extensions.insert(reinterpret_cast<const char *>(glGetStringi(GL_EXTENSIONS, i)));
 100                 }
 101                 else
 102                 {
 103                         if(const char *gl_ext = reinterpret_cast<const char *>(glGetString(GL_EXTENSIONS)))
 104                         {
 105                                 vector<string> exts = split(gl_ext);
 106                                 extensions.insert(exts.begin(), exts.end());
 107                         }
 108                 }
 109
 110                 init_done = true;
 111         }
 112
 113         return extensions.count(ext);
 114 }
 115
 116 bool is_supported(const Version &core_version, const Version &deprecated_version)
 117 {
 118         const Version &version = get_gl_version();
 119         if(deprecated_version && version>=deprecated_version && get_gl_profile()==CORE_PROFILE)
 120                 return false;
 121         return (version>=core_version);
 122 }
 123
 124 bool is_disabled(const string &ext)
 125 {
 126         static set<string> disabled_exts;
 127         static bool init_done = false;
 128
 129         if(!init_done)
 130         {
 131                 if(const char *disable_ptr = getenv("MSPGL_DISABLE_EXTENSIONS"))
 132                 {
 133                         vector<string> disable = split(disable_ptr);
 134                         disabled_exts.insert(disable.begin(), disable.end());
 135                 }
 136
 137                 if(const char *renderer_ptr = reinterpret_cast<const char *>(glGetString(GL_RENDERER)))
 138                 {
 139                         string renderer = renderer_ptr;
 140                         if(renderer.find("Radeon")!=string::npos || renderer.find("AMD")!=string::npos)
 141                         {
 142                                 /* Radeon doesn't process NV_primitive_restart correctly and treats
 143                                 the restart index as a normal element if the indices are stored in a
 144                                 buffer. */
 145                                 disabled_exts.insert("GL_NV_primitive_restart");
 146
 147                                 // The core primitive restart feature does not work either.
 148                                 disabled_exts.insert("GL_MSP_primitive_restart");
 149
 150                                 /* AMD's uniform buffer objects only work with the core version of
 151                                 shaders. */
 152                                 if(get_gl_version()<Version(2, 0))
 153                                         disabled_exts.insert("GL_ARB_uniform_buffer_object");
 154                         }
 155                 }
 156
 157                 init_done = true;
 158         }
 159
 160         return disabled_exts.count(ext);
 161 }
 162
 163 GLApi get_gl_api()
 164 {
 165 #ifdef GL_ES_VERSION_2_0
 166         return OPENGL_ES2;
 167 #else
 168         return OPENGL;
 169 #endif
 170 }
 171
 172 inline GLProfile _get_gl_profile()
 173 {
 174         if(get_gl_api()==OPENGL && get_gl_version()>=Version(3, 0))
 175         {
 176                 int mask;
 177                 glGetIntegerv(GL_CONTEXT_PROFILE_MASK, &mask);
 178                 if(mask==GL_CONTEXT_CORE_PROFILE_BIT)
 179                         return CORE_PROFILE;
 180         }
 181
 182         return COMPATIBILITY_PROFILE;
 183 }
 184
 185 GLProfile get_gl_profile()
 186 {
 187         static GLProfile profile = _get_gl_profile();
 188         return profile;
 189 }
 190
 191 inline Version _get_gl_version()
 192 {
 193         const char *gl_ver_ptr = reinterpret_cast<const char *>(glGetString(GL_VERSION));
 194         if(!gl_ver_ptr)
 195                 throw runtime_error("OpenGL version not available");
 196
 197         string gl_ver = gl_ver_ptr;
 198         if(!gl_ver.compare(0, 10, "OpenGL ES "))
 199                 gl_ver.erase(0, 10);
 200
 201         Version ver(gl_ver.substr(0, gl_ver.find(' ')));
 202
 203         if(const char *force_ver_ptr = getenv("MSPGL_FORCE_VERSION"))
 204         {
 205                 Version force_ver(force_ver_ptr);
 206                 if(force_ver<ver)
 207                         ver = force_ver;
 208         }
 209
 210         return ver;
 211 }
 212
 213 const Version &get_gl_version()
 214 {
 215         static Version version = _get_gl_version();
 216         return version;
 217 }
 218
 219 inline Version _get_glsl_version()
 220 {
 221         const char *glsl_ver_ptr = reinterpret_cast<const char *>(glGetString(GL_SHADING_LANGUAGE_VERSION));
 222         if(!glsl_ver_ptr)
 223                 throw runtime_error("GLSL version not available");
 224
 225         string glsl_ver = glsl_ver_ptr;
 226         if(!glsl_ver.compare(0, 18, "OpenGL ES GLSL ES "))
 227                 glsl_ver.erase(0, 18);
 228
 229         Version ver(glsl_ver.substr(0, glsl_ver.find(' ')));
 230
 231         if(const char *force_ver_ptr = getenv("MSPGL_FORCE_GLSL_VERSION"))
 232         {
 233                 Version force_ver(force_ver_ptr);
 234                 if(force_ver<ver)
 235                         ver = force_ver;
 236         }
 237
 238         return ver;
 239 }
 240
 241 const Version &get_glsl_version()
 242 {
 243         static Version version = _get_glsl_version();
 244         return version;
 245 }
 246
 247 ExtFunc *get_proc_address(const string &name)
 248 {
 249 #if defined(_WIN32)
 250         return reinterpret_cast<ExtFunc *>(wglGetProcAddress(name.c_str()));
 251 #elif defined(__APPLE__)
 252         (void)name;
 253         return 0;  // Not supported
 254 #elif defined(__ANDROID__)
 255         return eglGetProcAddress(name.c_str());
 256 #else
 257         return glXGetProcAddressARB(reinterpret_cast<const unsigned char *>(name.c_str()));
 258 #endif
 259 }
 260
 261 } // namespace GL
 262 } // namespace Msp