When you load texture(tex_LoadFromFile or tex_LoadFromMemory) you set parameter TEX_DEFAULT_2D(last argument in function). You can change it to this one(and define as your new constant):
Code:
TEX_DEFAULT_2D xor TEX_FILTER_LINEAR or TEX_FILTER_NEAREST
or build from scratch new one:
Code:
TEX_CLAMP or TEX_FILTER_NEAREST or TEX_CONVERT_TO_POT or TEX_CALCULATE_ALPHA
As you can see, main bits are TEX_FILTER_*