Get GL extension strings via glGetStringi() if GL version is >= 3.0.

auto/src/glew_init_gl.c

@@ -1,15 +1,58 @@
 /* ------------------------------------------------------------------------- */
 
+static
+GLboolean glewGetVersion(GLint *major, GLint *minor)
+{
+  const GLubyte* s;
+  GLuint dot;
+
+  s = glGetString(GL_VERSION);
+  dot = _glewStrCLen(s, '.');
+  if (dot == 0)
+    return GL_FALSE;
+
+  *major = s[dot-1]-'0';
+  *minor = s[dot+1]-'0';
+
+  if (*minor < 0 || *minor > 9)
+    *minor = 0;
+  if (*major<0 || *major>9)
+    return GL_FALSE;
+
+  return GL_TRUE;
+}
+
 GLboolean GLEWAPIENTRY glewGetExtension (const char* name)
 {    
+  GLint major, minor;
   const GLubyte* start;
   const GLubyte* end;
+  GLint numExts, ext;
+
+  if (!glewGetVersion(&major, &minor))
+    return GL_FALSE;
+
+  if (major < 3)
+  {
     start = (const GLubyte*)glGetString(GL_EXTENSIONS);
     if (start == 0)
       return GL_FALSE;
     end = start + _glewStrLen(start);
     return _glewSearchExtension(name, start, end);
   }
+  else
+  {
+    glGetIntegerv(GL_NUM_EXTENSIONS, &numExts);
+    for (ext = 0; ext < numExts; ext++)
+    {
+      start = (const GLubyte *)glGetStringi(GL_EXTENSIONS, ext);
+      end = start + _glewStrLen(start);
+      if (_glewSearchExtension(name, start, end))
+	return GL_TRUE;
+    }
+    return GL_FALSE;
+  }
+}
 
 /* ------------------------------------------------------------------------- */
 
@@ -18,27 +61,15 @@ static
 #endif
 GLenum GLEWAPIENTRY glewContextInit (GLEW_CONTEXT_ARG_DEF_LIST)
 {
-  const GLubyte* s;
-  GLuint dot;
   GLint major, minor;
   const GLubyte* extStart;
   const GLubyte* extEnd;
+  GLint numExts, ext;
 
   /* query opengl version */
-  s = glGetString(GL_VERSION);
+  if (!glewGetVersion(&major, &minor))
-  dot = _glewStrCLen(s, '.');
-  if (dot == 0)
     return GLEW_ERROR_NO_GL_VERSION;
   
-  major = s[dot-1]-'0';
-  minor = s[dot+1]-'0';
-
-  if (minor < 0 || minor > 9)
-    minor = 0;
-  if (major<0 || major>9)
-    return GLEW_ERROR_NO_GL_VERSION;
-  
-
   if (major == 1 && minor == 0)
   {
     return GLEW_ERROR_GL_VERSION_10_ONLY;

auto/src/glew_init_glext.c

@@ -1,5 +1,29 @@
 
-  /* query opengl extensions string */
+  /* query opengl extensions string(s) */
+  if(GLEW_VERSION_3_0)
+  {
+    GLuint len;
+    struct initflag *ptr;
+
+    glGetIntegerv(GL_NUM_EXTENSIONS, &numExts);
+    for (ext = 0; ext < numExts; ext++)
+    {
+      extStart = glGetStringi(GL_EXTENSIONS, ext);
+      len = _glewStrLen(extStart);
+      ptr = in_word_set(extStart, len);
+
+      if (ptr != NULL && ptr->flag != NULL) {
+#ifdef GLEW_MX
+        *(GLboolean *)((char *)ctx + (size_t)(ptr->flag)) = GL_TRUE;
+#else
+        *ptr->flag = GL_TRUE;
+#endif
+      }
+      extStart += len + 1;
+    }
+  }
+  else
+  {
     extStart = glGetString(GL_EXTENSIONS);
     if (extStart == 0)
       extStart = (const GLubyte*)"";
@@ -19,5 +43,6 @@
       }
       extStart += len + 1;
     }
+  }
 
   /* initialize extensions */