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51 lines
1.7 KiB
Python
Executable File
51 lines
1.7 KiB
Python
Executable File
#!/usr/bin/env python3
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from math import sqrt, sin, cos, acos, pi
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import util
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# Graph is plotted across the entire HGR screen, but only coordinates
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# - in the left half of the screen, AND
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# - on even rows, AND
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# - on even columns
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# are included. It is assumed that the graph is symmetrical across
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# the left and half sides of the screen (along an axis at X=140).
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#
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# X coordinates are converted to byte+bitmask (but see notes below).
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# Y coordinates are flipped (so 0,0 ends up on the bottom left) then
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# incremented by 1 so that 0 can terminate the loop,
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#
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# 6502 code will be responsible for plotting each of these coordinates
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# in a 2x2 block. The bitmask usually includes 2 adjacent pixels;
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# the code will also plot the same 2 adjacent pixels in the adjacent row,
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# AND mirror both of those plots in the right half of the screen.
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#
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# Unfortunately, since bytes are 7 bits across, some blocks will cross a
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# byte boundary. To simplify the 6502 code, those are simply listed as
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# separate coordinate pairs, each with a bitmask that includes 1 pixel
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# instead of 2.
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max_x = 280
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max_y = 192
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def f(t):
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return (sqrt(t)*cos(2*pi*sqrt(t)), 0.87*sqrt(t)*sin(2*pi*sqrt(t)))
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coords = []
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for i in range(2000000):
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a, b = f(float(i)/10.0)
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x = round(max_x+a)
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y = round(b)
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if x % 2 != 0 or y % 3 != 0:
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continue
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if x < 0 or x >= max_x or y < 0 or y >= max_y:
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continue
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coords.append((x,y))
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unique_coords = util.unique(coords)
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unique_vals = util.vals_3bit(unique_coords)
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ripple_vals = util.ripple(unique_vals)
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ripple_vals = util.ripple(ripple_vals)
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with open("../../../src/fx/fx.hgr.corner.superripple.data.a", "w") as f:
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for aval, bval in ripple_vals:
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f.write(" !byte %s,%s\n" % (aval, bval))
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