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A problem about GLSL and texture application

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hello every body: i am very confused recently The values computed by the fragment shader are ultimately used to update frame-buffer memory or texture memory. is it right? i don't understand how to update the texture memory.if you know,could you tell me how to do that.because i want to change the texture value(is rgba,not stpq) in the fragment shader.can i do it ?please help me .thank you any helps. waiting....

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