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並前往https://computergraphics.stackexchange.com/questions/7687/how-to-use-glsl-texelfetch

How to use GLSL texelFetch? - Computer Graphics Stack ...

Thus, an example of using texelFetch() should be: vec4 texelValue= texelFetch(texture2D, ivec2(gl_FragCoord.xy), 0);.

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