2021-10-20 19:53:05 +02:00
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tool
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extends Reference
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const Commons = preload("res://addons/mat_maker_gd/nodes/common/commons.gd")
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#Based on MaterialMaker's curve.gd
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#Curve PoolRealArray: p.x, p.y, ls, rs, p.x, p.y ....
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#class Point:
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# var p : Vector2
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# var ls : float
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# var rs : float
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#func get_shader(name) -> String:
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# var shader
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# shader = "float "+name+"_curve_fct(float x) {\n"
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# for i in range(points.size()-1):
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# if i < points.size()-2:
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# shader += "if (x <= p_"+name+"_"+str(i+1)+"_x) "
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#
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# shader += "{\n"
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# shader += "float dx = x - p_"+name+"_"+str(i)+"_x;\n"
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# shader += "float d = p_"+name+"_"+str(i+1)+"_x - p_"+name+"_"+str(i)+"_x;\n"
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# shader += "float t = dx/d;\n"
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# shader += "float omt = (1.0 - t);\n"
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# shader += "float omt2 = omt * omt;\n"
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# shader += "float omt3 = omt2 * omt;\n"
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# shader += "float t2 = t * t;\n"
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# shader += "float t3 = t2 * t;\n"
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# shader += "d /= 3.0;\n"
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# shader += "float y1 = p_"+name+"_"+str(i)+"_y;\n"
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# shader += "float yac = p_"+name+"_"+str(i)+"_y + d*p_"+name+"_"+str(i)+"_rs;\n"
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# shader += "float ybc = p_"+name+"_"+str(i+1)+"_y - d*p_"+name+"_"+str(i+1)+"_ls;\n"
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# shader += "float y2 = p_"+name+"_"+str(i+1)+"_y;\n"
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# shader += "return y1*omt3 + yac*omt2*t*3.0 + ybc*omt*t2*3.0 + y2*t3;\n"
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# shader += "}\n"
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#
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# shader += "}\n"
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# return shader
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static func curve(x : float, points : PoolRealArray) -> float:
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if points.size() % 4 != 0 || points.size() < 8:
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return 0.0
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var ps : int = points.size() / 4
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for i in range(ps - 1):
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var pi : int = i * 4
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var pip1 : int = (i + 1) * 4
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if i < ps - 2:
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# if (x <= p_"+name+"_"+str(i+1)+"_x)
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if x > points[pip1]:
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continue
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#float dx = x - p_"+name+"_"+str(i)+"_x;
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var dx : float = x - points[pi];
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#var d : float = p_"+name+"_"+str(i+1)+"_x - p_"+name+"_"+str(i)+"_x;
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2021-10-26 11:35:45 +02:00
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var d : float = points[pip1] - points[pi];
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2021-10-20 19:53:05 +02:00
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var t : float = dx / d
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var omt : float = (1.0 - t)
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var omt2 : float = omt * omt
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var omt3 : float = omt2 * omt
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var t2 : float = t * t
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var t3 : float = t2 * t
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d /= 3.0
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# var y1 : float = p_"+name+"_"+str(i)+"_y
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var y1 : float = points[pi + 1]
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# var yac : float = p_"+name+"_"+str(i)+"_y + d*p_"+name+"_"+str(i)+"_rs
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var yac : float = points[pi + 1] + d * points[pi + 3]
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# var ybc : float = p_"+name+"_"+str(i+1)+"_y - d*p_"+name+"_"+str(i+1)+"_ls
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var ybc : float = points[pip1 + 1] - d * points[pip1 + 2]
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# var y2 : float = p_"+name+"_"+str(i+1)+"_y
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var y2 : float = points[pip1 + 1]
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return y1 * omt3 + yac * omt2 * t * 3.0 + ybc * omt * t2 * 3.0 + y2 * t3;
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return 0.0
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