我的fragment着色器中有两个具有不同坐标和大小的纹理:varyinghighpvec2v_currentTextureCoords;varyinghighpvec2v_backgroundTextureCoords;uniformsampler2Du_currentTexture;uniformsampler2Du_backgroundTexture;voidmain(){vec4currentColor=texture2D(u_currentTexture,v_currentTextureCoords);vec4backgroundColor=texture2D(u_backg