89 lines
2.1 KiB
Plaintext
89 lines
2.1 KiB
Plaintext
global str screen_namespace = "/dev/screen/0"
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global str mouse_namespace = "/dev/mouse/0"
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global str terminal_namespace = "/dev/term/0"
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global str new_line = "\n"
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global byte white = 255
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function main ()
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plex screen $0
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plex mouse $1
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str tmp_str $2
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byte color $3
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bool left_down $4
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int mode $5
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nat offset_temp $6
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nat x $7
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nat y $8
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nat width $9
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nat screen_buffer $10
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nat buffer_size $11
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nat pixel_pos $12
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load_immediate &screen_namespace -> screen
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load_immediate 0 -> mode
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syscall OPEN screen mode -> screen
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nat_to_string screen -> tmp_str
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call &pln tmp_str
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load_offset_32 screen 8 -> width
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nat_to_string width -> tmp_str
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call &pln tmp_str
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load_offset_32 screen 12 -> buffer_size
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nat_to_string buffer_size -> tmp_str
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call &pln tmp_str
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load_immediate 16 -> offset_temp
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add_nat screen offset_temp -> screen_buffer
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nat_to_string screen_buffer -> tmp_str
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call &pln tmp_str
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// open mouse
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load_immediate &mouse_namespace -> mouse
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syscall OPEN mouse mode -> mouse
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syscall WRITE screen screen_buffer buffer_size // redraw
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loop draw_loop
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// load mouse click data
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syscall STAT mouse
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load_offset_8 mouse 16 -> left_down
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jump_eq_nat draw_loop left_down mode // mode = 0 / false
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load_offset_32 mouse 8 -> x
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load_offset_32 mouse 12 -> y
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// Compute start address: y *width + x
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mul_nat y width -> pixel_pos
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add_nat x pixel_pos -> pixel_pos
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add_nat screen_buffer pixel_pos -> pixel_pos
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load_immediate 4 -> fat_ptr_size
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add_nat pixel_pos fat_ptr_size -> pixel_pos
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load_absolute_32 white -> color
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store_absolute_8 pixel_pos color // draw color at screen [x,y]
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syscall WRITE screen screen_buffer buffer_size // redraw
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jump draw_loop
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exit 0
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function pln (str message $0)
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str term $1
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int msg_length $2
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str nl $3
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int nl_length $4
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int mode $5
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load_immediate 0 -> mode
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syscall OPEN &terminal_namespace mode -> term
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strlen message -> msg_length
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syscall WRITE term message msg_length
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load_address new_line -> nl
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strlen nl -> nl_length
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syscall WRITE term nl nl_length
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return
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