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97 lines
1.9 KiB
97 lines
1.9 KiB
(
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(def PX_W 1024)
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(def PX_H 768)
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(def UPSCALE 8)
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(def MAXITER 50)
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(sc-init PX_W PX_H)
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(sc-opt SCREEN_AUTOBLIT 0)
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(sc-opt SCREEN_UPSCALE UPSCALE)
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(def W (=div PX_W UPSCALE))
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(def H (=div PX_H UPSCALE))
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(sym gradient r9)
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(sym asciigr r10)
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(mkbf gradient (
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0x421e0f 0x19071a 0x09012f 0x040449 0x000764 0x0c2c8a 0x1852b1 0x397dd1
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0x86b5e5 0xd3ecf8 0xf1e9bf 0xf8c95f 0xffaa00 0xcc8000 0x995700 0x6a3403))
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(sym x r7)
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(sym y r8)
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(:row)
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(:col)
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(call pixel x y)
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(sub r0 MAXITER 1)
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(rcmp res0 1 r0
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(eq?
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(mod r0 res0 16)
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(bfrd r0 @gradient r0)
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)
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(else? (ld r0 0))
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)
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(sc-wr x y r0)
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(inc x)
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(cmp x W)
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(j.ne :col)
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(ld x 0)
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(inc y)
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(sc-blit) ; Render after every row
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(cmp y H)
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(j.ne :row)
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;(sc-blit)
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(:slp)
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(sc-poll)
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(mslp 10)
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(j :slp)
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(proc pixel xi yi
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(sym x0 r7)
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(sym y0 r8)
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(itf x0 xi)
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(itf y0 yi)
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; Scale to the interesting range x -2.5..1 and y -1..1
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(itf r0 W)
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(itf r1 H)
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(fdiv x0 r0)
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(fmul x0 3.5)
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(fsub x0 2.5)
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(fdiv y0 r1)
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(fmul y0 2.4)
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(fsub y0 1.2)
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(sym x r5)
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(sym y r6)
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(ld x 0.0)
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(ld y 0.0)
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(sym iter r4)
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(:iter)
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(cmp iter MAXITER)
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(j.eq :end)
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(fmul r0 x x)
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(fmul r1 y y)
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(fadd r2 r1)
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(fcmp r2 4.0)
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(j.gt :end)
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(fsub r2 r0 r1)
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(fadd r2 x0)
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(fmul r0 x y)
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(fmul r0 2.0)
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(fadd r0 y0)
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(ld y r0)
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(ld x r2)
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(inc iter)
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(j :iter)
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(:end)
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(ret iter)
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)
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)
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