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objective-ccocos2d-iphoneglsles

Objective-C GLSL mix() equivalent

I`m trying to figure out how to write a equivalent to GLSL(ES)s mix method. I tried to add/divide rgb Values but with no luck yet. Any pointer to how the GLSL method works would be welcome.

Solution

  • mix in GLSL does a linear combination of its two inputs, based on a scaling factor that ranges in [0,1]. From the GLSL specification:

    T mix ( T x, T y, T2 a )
{
    return (1-a)*x + a*y;
}

    where T represents any valid vector or scalar type in GLSL capable of being modulated by a scalar value (e.g., vec2, mat4, etc.). T2 is either a floating-point type (i.e., float or double), or the type matching T, in which case a is applied component-wise to the components of x and y.