c++ - OpenGL functions fails in multithread application -


why sometimes after next calls:

takeopengl(); glgettexlevelparameteriv(gl_texture_2d, 0, gl_texture_width, &texturewidth); glgettexlevelparameteriv(gl_texture_2d, 0, gl_texture_height, &textureheight); freeopengl();

variables texture* have incorrect values?

im using opengl mutex, doing next:

void takeopengl(){     opengl.enter();     wglmakecurrent(hdc, hrc); }  void freeopengl(){     opengl.leave();     wglmakecurrent(0, 0); }

what problems?

you can't call wglmakecurrent without holding mutex. freeopengl function this.


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