gpu_get_tex_mip_filter_ext


Description

With this function you can get the current mip filter mode for a given shader sampler. You supply the index value for the shader sampler (as returned by the function shader_get_sampler_index(), and the function will return one of the mode value constants listed below.


Syntax:

gpu_get_tex_mip_filter_ext(sampler_index);


Argument Description
sampler_index The index of the shader sampler to get


Returns:

Constant (listed below):

Constant Description
tf_point This means that blending between mipmap levels is disabled, which can cause visible texture transitions, but gives the best performance.
tf_linear This means that blending between mipmap levels is enabled (this is also known as trilinear filtering), which smooths the texture transitions, but it will give a minor hit to performance.
tf_anisotropic This means that anisotropic filtering is enabled, which greatly improves texture transition quality and can reduce the blurring visible with other filtering modes, but it has the highest hit on performance.


Example:

var _sampleIndex = shader_get_sampler_index(shd_Glass, "s_Background");
var _spriteTex = sprite_get_texture(sprite_index, 0);
shader_set(shd_Glass);
if gpu_get_tex_mip_filter_ext(_sampleIndex) != tf_point
    {
    gpu_set_tex_mip_filter_ext(_sampleIndex, tf_point);
    }
texture_set_stage(_sampleIndex , _spriteTex);
shader_reset();

The above code sets the mip filter mode to tf_point (disabling mipmapping) for the given shader texture sampler if it has not already been set.