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When there is a program,which consists of normal c++ code and opengl code.
So,both c++ and opengl are compiled and linked to ELF.
And,seemingly they both run on CPU.
Why opengl code has more power to paint on screen than c++ code ?
Because OpenGL merely sends drawing commands to the GPU, which is then doing the bulk work. Note that there are also OpenGL implementations that are not GPU accelerated and therefore not faster than other software rasterizers running on the CPU.