148 lines
4.1 KiB
Common Lisp
148 lines
4.1 KiB
Common Lisp
((code
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(label main
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; Open screen
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; use load immediate because it is a pointer to a string, not a value
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(load-immediate $0 &screen-namespace)
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(load-immediate $11 0)
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(syscall OPEN $0 $18 $11) ; open(out Plex screen, in namespace, in flags)
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(load-offset-32 $20 $0 8) ; load width
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(load-offset-32 $22 $0 12) ; load size
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(load-immediate $1 16) ; offset for screen buffer
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(add-nat $21 $0 $1)
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; open mouse
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(load-immediate $16 &mouse-namespace)
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(syscall OPEN $15 $16 $11) ; open(out Plex mouse, in namespace, in flags)
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; outline_swatch(screen, BLACK, 1, 1);
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(load-absolute-32 $1 &BLACK)
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(load-immediate $12 1)
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(load-immediate $13 1)
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(call &draw-outlined-swatch ($21 $1 $12 $13 $20) nil)
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; outline_swatch(screen, WHITE, 1, 1);
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(load-absolute-32 $1 &WHITE)
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(load-immediate $12 21)
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(load-immediate $13 1)
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(call &draw-outlined-swatch ($21 $1 $12 $13 $20) nil)
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; screen.draw();
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(syscall WRITE $0 $21 $22)
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(label draw-loop
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; load mouse click data
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(syscall REFRESH $15)
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(load-offset-8 $9 $15 16) ; load btn1 pressed
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(jump-eq-nat &draw-loop $9 $11)
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(load-offset-32 $7 $15 8) ; load x
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(load-offset-32 $8 $15 12) ; load y
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(load-immediate $14 20) ; box size
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; first row
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(load-absolute-32 $1 &BLACK)
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(load-immediate $12 1)
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(load-immediate $13 1)
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(call &draw-outlined-swatch ($21 $1 $12 $13 $20) nil)
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(call &set-color-if-clicked ($7 $8 $12 $13 $1 $14) nil)
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(load-absolute-32 $1 &WHITE)
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(load-immediate $12 21)
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(load-immediate $13 1)
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(call &draw-outlined-swatch ($21 $1 $12 $13 $20) nil)
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(call &set-color-if-clicked ($7 $8 $12 $13 $1 $14) nil)
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(syscall WRITE $0 $21 $22)
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(load-absolute-32 $22 &SELECTED-COLOR) ; color
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(load-immediate $1 5) ; size of brush
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(call &draw-box ($21 $20 $22 $7 $8 $1 $1) nil)
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(jump &draw-loop))
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; Flush and halt
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(halt))
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(label set-color-if-clicked
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; (click_x, click_y, box_x, box_y, color, box_size)
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; Compute right = box_x + box_size
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(add-int $6 $2 $5) ; $6 = right edge
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; Compute bottom = box_y + box_size
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(add-int $7 $3 $5) ; $7 = bottom edge
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; Bounds check: x in [box_x, right] and y in [box_y, bottom]
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(jump-lt-int &fail $0 $2)
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(jump-gt-int &fail $0 $6)
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(jump-lt-int &fail $1 $3)
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(jump-gt-int &fail $1 $7)
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(load-immediate $10 &SELECTED-COLOR)
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(store-absolute-8 $10 $4)
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(label fail)
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(return nil))
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(label draw-outlined-swatch
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; (base, color, x, y, width)
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; Constants
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(load-absolute-32 $5 &GRAY)
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(load-absolute-32 $10 &SELECTED-COLOR)
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(jump-eq-int &set-selected $10 $1)
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(jump-eq-int &end-set-selected $5 $5)
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(label set-selected)
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(load-absolute-32 $5 &DARK-GRAY)
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(label end-set-selected)
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(load-immediate $6 20) ; outline size
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(load-immediate $7 17) ; fill size
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(load-immediate $8 2) ; offset
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(call &draw-box ($0 $4 $5 $2 $3 $6 $6) nil)
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(add-int $9 $2 $8) ; x + 2
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(add-int $10 $3 $8) ; y + 2
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(call &draw-box ($0 $4 $1 $9 $10 $7 $7) nil)
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(return nil))
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(label draw-box
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; (base, screen_width, color, x_start, y_start, width, height)
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; Compute start address: base + y*640 + x
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(mul-int $15 $4 $1) ; $15 = y * 640
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(add-int $15 $15 $3) ; $15 += x
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(add-nat $15 $0 $15) ; $15 = base + pixel_offset
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(load-immediate $25 4)
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(add-nat $15 $15 $25) ; need to add offset for fat pointer size
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; Outer loop: height times
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(load-immediate $30 1) ; increment
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(label draw-box-outer
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(add-int $27 $15 $5) ; $27 = row end = current + width
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(register-move $29 $15) ; $7 = pixel pointer
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(memset-8 $29 $2 $5) ; draw row
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(add-int $15 $15 $1) ; next row (+= 640)
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(sub-int $6 $6 $30) ; decrement row count
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(jump-gt-int &draw-box-outer $6 0))
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(return nil)))
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(data
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(label screen-namespace "/dev/screen/0")
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(label mouse-namespace "/dev/mouse/0")
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(label SELECTED-COLOR 255)
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(label BLACK 0)
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(label WHITE 255)
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(label DARK-GRAY 73)
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(label GRAY 146)
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(label LIGHT-GRAY 182)))
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