c++ - Why does GLEW say that I don't have extensions? -


i'm @ initialization phase of opengl application, , i'm adding code check various extensions. hit stumbling point:

/* check ext_texture_compression_s3tc */ if (glew_ext_texture_compression_s3tc)     infomore("gl_ext_texture_compression_s3tc supported.\n"); else     errormore("gl_ext_texture_compression_s3tc unsupported.\n");  /* check anisotropic filtering */ if (glew_ext_texture_filter_anisotropic)     infomore("gl_ext_texture_filter_anisotropic supported.\n"); else     warnmore("gl_ext_texture_filter_anisotropic unsupported.\n");

according this, both s3tc , anisotropic filtering unsupported video card, though know fact have it. have used both myself opengl on same project no issue. glew initializes fine (with glewexperimental = true), context set properly, , else works fine, reason glew thinks don't have these extensions.

what's going on here?

please allow sume (moderately) wild guesses: you, chance, use core profile context? , use glewexperimental = true because of this?

the problem glew broken respect core profiles. tries use glgetstring(gl_extensions), invalid in core profiles (the modern way use glgetintegerv(gl_num_extensions, &ext_cnt); (i=0; i<ext_cnt; i++) glgetstringi(gl_extension,i) ), , generate error. glew fails query extensions available. glewexperimental = true is: ignore fact extensions seem missing, , query function pointers anyway. big hack, , fact function pointer might present not guarantee repective gl extension present , useable. other side effect of mess experiencing: glew, these extensions not present.

i don't know why glew hasn't fixed isse since years (and there proposed patches make compatible modern core profiles), looks behavior stay long time.


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