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243 lines
5.6 KiB
243 lines
5.6 KiB
(
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(sc-init 1024 768)
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(sc-opt SCREEN_AUTOBLIT 0)
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(def W 1024)
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(def H 768)
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(def MAXITER 50)
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(lds @cout "Interactive Mandelbrot\n")
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(lds @cout "----------------------\n")
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(lds @cout "Navigate using WASD, zoom using Q/E\n")
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(lds @cout "To get a high-res image, stop interacting for while\n")
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(sym asciigr r10)
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(sym mb_x r2)
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(sym mb_y r3)
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(sym mb_s r4)
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(sym mb_row r5)
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; index into the skip/size table
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(sym mb_skip_index r6)
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; size of big pixels
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(def COL_SKIP 8)
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(def ROW_SKIP 8)
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; incrementally renders 1x1, 2x2, 4x4, ...
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(def MB_SKIP_TABLE_SIZE 80)
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(def MB_SKIP_REPEAT_INDEX 16)
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(sym mb_skip_table_x r7)
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(sym mb_skip_table_y r8)
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(sym mb_size_table r12)
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(mkbf mb_skip_table_x (
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0 4 0 4 2 6 0 2 4 6 2 6 0 2 4 6
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; 8x8 grid
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1 3 5 7 1 3 5 7 1 3 5 7 1 3 5 7
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0 2 4 6 0 2 4 6 0 2 4 6 0 2 4 6
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1 3 5 7 1 3 5 7 1 3 5 7 1 3 5 7
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; do top left pixels again
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0 2 4 6 0 2 4 6 0 2 4 6 0 2 4 6
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))
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(mkbf mb_skip_table_y (
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0 0 4 4 0 0 2 2 2 2 4 4 6 6 6 6
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; 8x8 grid
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0 0 0 0 2 2 2 2 4 4 4 4 6 6 6 6
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1 1 1 1 3 3 3 3 5 5 5 5 7 7 7 7
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1 1 1 1 3 3 3 3 5 5 5 5 7 7 7 7
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; do top left pixels again
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0 0 0 0 2 2 2 2 4 4 4 4 6 6 6 6
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))
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(mkbf mb_size_table (
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8 4 4 4 2 2 2 2 2 2 2 2 2 2 2 2
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; 8x8 grid
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1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
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1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
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1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
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; do top left pixels again
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1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
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))
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(ld mb_x 0.0)
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(ld mb_y 0.0)
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(ld mb_s 1.0)
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(sym did_change r14)
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(sym is_first_render r15)
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(ld is_first_render 1)
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; render row
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; size - pixel size
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; col - column offset
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; px - offset x
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; py - offset y
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; scale - scaling
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; row - row position
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(proc render_row size col px py scale row
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(sym gradient r9)
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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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(add y row)
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(ld x col)
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(:col)
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(call pixel x y px py scale)
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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-rect x y size size r0)
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(add x COL_SKIP)
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(cmp x W)
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(j.lt :col)
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(sc-blit)
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(ret))
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(:slp)
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(sc-poll)
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; did_change -- did the user interact during this frame?
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(ld did_change 0)
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; scaled movement speed in r1
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(fdiv r1 0.03 mb_s)
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; A <
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(sc-key r0 KEY_A)
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(j.z :a_not_pressed)
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(fsub mb_x r1)
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(ld did_change 1)
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(:a_not_pressed)
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; W ^
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(sc-key r0 KEY_W)
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(j.z :w_not_pressed)
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(fsub mb_y r1)
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(ld did_change 1)
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(:w_not_pressed)
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; S v
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(sc-key r0 KEY_S)
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(j.z :s_not_pressed)
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(fadd mb_y r1)
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(ld did_change 1)
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(:s_not_pressed)
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; D >
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(sc-key r0 KEY_D)
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(j.z :d_not_pressed)
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(fadd mb_x r1)
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(ld did_change 1)
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(:d_not_pressed)
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; Q +
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(sc-key r0 KEY_Q)
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(j.z :q_not_pressed)
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(fmul mb_s 1.01)
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(ld did_change 1)
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(:q_not_pressed)
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; E -
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(sc-key r0 KEY_E)
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(j.z :e_not_pressed)
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(fdiv mb_s 1.01)
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(ld did_change 1)
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(:e_not_pressed)
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(cmp did_change 0)
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(j.eq :did_not_move)
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; if something changed...
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; mark this as a first render and reset col_skip and row_skip
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(ld is_first_render 1)
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(ld mb_skip_index 0)
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(:did_not_move)
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(sym mb_col_skip r9)
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(sym mb_row_skip r11)
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(bfrd mb_col_skip @mb_skip_table_x mb_skip_index)
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(bfrd mb_row_skip @mb_skip_table_y mb_skip_index)
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(bfrd r1 @mb_size_table mb_skip_index)
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; render row mb_row + row skip
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(ld r0 mb_row)
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(add r0 mb_row_skip)
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(call render_row r1 mb_col_skip mb_x mb_y mb_s r0)
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(cmp mb_row H)
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(j.ge :render_done)
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; if mb_row < H
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(add mb_row ROW_SKIP)
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(j :render_not_done)
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(:render_done)
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; otherwise, this frame is done
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(ld mb_row 0)
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(add mb_skip_index 1)
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(ld is_first_render 0)
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(cmp mb_skip_index MB_SKIP_TABLE_SIZE)
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; if skip index is out of bounds, go back to repeating area
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(j.lt :not_end)
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(ld mb_skip_index MB_SKIP_REPEAT_INDEX)
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(:not_end)
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(:render_not_done)
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(j :slp)
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(proc pixel xi yi off_x off_y scale
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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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(fdiv x0 scale)
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(fdiv y0 scale)
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(fadd x0 off_x)
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(fadd y0 off_y)
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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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