程序流程
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vec2 floor (vec2 x): Returns a value equal to the nearest integer that
is less than or equal to x.
vec2 fract (vec2 x): Returns x – floor (x).
vec2 step (vec2 edge, vec2 x): Returns 0 if x <= edge; otherwise, it returns 1.0.
vec3 mix (vec3 x, vec3 y, vec3 a): Returns x * (1.0 – a) + y * a, i.e., the linear
blend of x and y using the floating-point value a.
The value for a is not restricted to the range [0,1].
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程序清单
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