185 lines
5.1 KiB
Plaintext
185 lines
5.1 KiB
Plaintext
global const str screen_namespace = "/dev/screen/0"
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global const str mouse_namespace = "/dev/mouse/0"
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global const byte BLACK = 0
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global const byte WHITE = 255
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global const byte DARK_GRAY = 73
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global const byte GRAY = 146
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global const byte LIGHT_GRAY = 182
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global byte SELECTED_COLOR = 255
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function main ()
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# Open screen
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plex screen is $0
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str screen_name is $18
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int mode is $11
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nat screen_buffer is $21
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# use load immediate because it is a pointer to a string, not a value
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load_address &screen_namespace -> screen_name
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load_immediate 0 -> mode
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syscall OPEN screen_name mode -> screen # Screen screen = open("/dev/screen/0", 0);
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nat width is $20
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nat size is $22
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load_offset_32 screen 8 -> width # load width
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load_offset_32 screen 12 -> size # load size
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load_immediate 16 -> $1 # offset for screen buffer
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add_nat screen $1 -> screen_buffer
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# open mouse
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plex mouse is $15
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str mouse_name is $16
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load_address &mouse_namespace -> mouse_name
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syscall OPEN mouse_name mode -> mouse # Mouse mouse = open("/dev/mouse/0", 0);
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byte color is $1
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nat x_pos is $12
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nat y_pos is $13
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load_absolute_32 &BLACK -> color
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load_immediate 1 -> x_pos
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load_immediate 1 -> y_pos
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call &draw_outlined_swatch screen_buffer color x_pos y_pos width
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load_absolute_32 &WHITE -> color
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load_immediate 21 -> x_pos
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load_immediate 1 -> y_pos
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call &draw_outlined_swatch screen_buffer color x_pos y_pos width
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# screen.draw#
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syscall WRITE screen screen_buffer size
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nat zero is $11
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draw_loop:
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# load mouse click data
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syscall REFRESH mouse
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byte left_down is $9
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load_offset_8 mouse 16 -> left_down # load btn1 pressed
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jump_eq_nat &draw_loop left_down zero
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nat mouse_x is $7
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nat mouse_y is $8
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load_offset_32 mouse 8 -> mouse_x # load x
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load_offset_32 mouse 12 -> mouse_y # load y
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nat box_size is $14
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load_immediate 20 -> box_size
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# first row
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load_absolute_32 &BLACK -> color
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load_immediate 1 -> x_pos
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load_immediate 1 -> y_pos
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call &draw_outlined_swatch screen_buffer color x_pos y_pos width
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call &set_color_if_clicked mouse_x mouse_y x_pos y_pos color box_size
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load_absolute_32 &WHITE -> color
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load_immediate 21 -> x_pos
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load_immediate 1 -> y_pos
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call &draw_outlined_swatch screen_buffer color x_pos y_pos width
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call &set_color_if_clicked mouse_x mouse_y x_pos y_pos color box_size
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syscall WRITE screen screen_buffer size
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byte selected_color is $25
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load_absolute_32 &SELECTED_COLOR -> selected_color
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nat brush_size is $19
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load_immediate 5 -> brush_size
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call &draw_box screen_buffer width selected_color mouse_x mouse_y brush_size brush_size
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jump &draw_loop
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# Flush and exit
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exit 0
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function set_color_if_clicked (int click_x is $0, int click_y is $1,
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int box_x is $2, int box_y is $3, byte color is $4, int box_size is $5)
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# Compute right
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int right_edge is $6
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add_int box_x box_size -> right_edge
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# Compute bottom = box_y + box_size
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int bottom_edge is $7
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add_int box_y box_size -> 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 click_x box_x
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jump_ge_int &fail click_x right_edge
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jump_lt_int &fail click_y box_y
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jump_ge_int &fail click_y bottom_edge
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store_absolute_8 &SELECTED_COLOR color
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fail:
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return
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function draw_outlined_swatch(nat base is $0,
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byte color is $1, int x is $2, int y is $3, int width is $4)
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# Constants
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nat background_color is $5
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load_absolute_32 &GRAY -> background_color
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byte selected_color is $10
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load_absolute_32 &SELECTED_COLOR -> selected_color
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jump_eq_int &set_selected selected_color color
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jump &end_set_selected
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set_selected:
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load_absolute_32 &DARK_GRAY -> background_color
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end_set_selected:
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nat outline_size is $6
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load_immediate 20 -> outline_size
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nat fill_size is $7
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load_immediate 17 -> fill_size
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nat offset is $8
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load_immediate 2 -> offset
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call &draw_box base width background_color x y outline_size outline_size
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add_int x offset -> $9 # x + 2
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add_int y offset -> $10 # y + 2
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call &draw_box base width color $9 $10 fill_size fill_size
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return
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function draw_box (nat base is $0, nat screen_width is $1,
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byte color is $2, nat x_start is $3, nat y_start is $4, nat width is $5, nat height is $6)
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# Compute start address: base + y*640 + x
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nat offset is $15
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mul_int y_start screen_width -> offset
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add_int offset x_start -> offset
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add_nat offset base -> offset
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nat fat_ptr_size is $25
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load_immediate 4 -> fat_ptr_size
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add_nat offset fat_ptr_size -> offset # need to add offset for fat pointer size
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int i is $30
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load_immediate 1 -> i
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int zero is $26
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load_immediate 0 -> zero
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int row_end is $27
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nat pixel_ptr is $29
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draw_box_outer:
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add_int offset width -> row_end # current + width
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register_move offset -> pixel_ptr # set pixel point
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memset_8 pixel_ptr color width # draw row
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add_int offset screen_width -> offset # next row += 640
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sub_int height i -> height # decrement row count
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jump_gt_int &draw_box_outer height zero
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return
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