72 lines
1.8 KiB
Plaintext
72 lines
1.8 KiB
Plaintext
const str screen_namespace = "/dev/screen/0";
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const str mouse_namespace = "/dev/mouse/0";
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const str terminal_namespace = "/dev/term/0";
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const str new_line = "\n";
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const byte WHITE = 255;
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function 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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nat tmp_ptr = &screen_namespace;
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int mode = 0;
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plex screen = open(tmp_ptr, mode);
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nat screen_handle = screen.handle;
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str tmp_str = screen_handle as str;
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pln(tmp_str);
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nat width = screen.width;
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tmp_str = width as str;
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pln(tmp_str);
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nat buffer_size = screen.size;
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tmp_str = buffer_size as str;
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pln(tmp_str);
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nat screen_buffer = screen.buffer.ptr;
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tmp_str = screen_buffer as str;
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pln(tmp_str);
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// open mouse
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tmp_ptr = &mouse_namespace;
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plex mouse = open(tmp_ptr, mode);
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write(screen, screen_buffer, buffer_size); // redraw
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loop {
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// load mouse click data
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stat(mouse);
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byte left_down = mouse.left;
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if (left_down == 0) continue;
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nat x = mouse.x;
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nat y = mouse.y;
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// Compute start address: y*width + x
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nat pixel_pos = y * width; // = y * width
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pixel_pos = x + pixel_pos; // += x
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pixel_pos = screen_buffer + pixel_pos; // += pixel_offset
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nat fat_ptr_size = 4; // need to add offset for fat pointer size
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pixel_pos = pixel_pos + fat_ptr_size;
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byte color = WHITE;
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store_absolute_8(pixel_pos, color); // draw color at screen [x,y]
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write(screen, screen_buffer, buffer_size); // redraw
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}
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exit(0);
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}
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function pln (str message) {
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nat term_ns = &terminal_namespace; // get terminal device
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int mode = 0;
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plex term = open(term_ns, mode);
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int msg_length = message.length;
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write(term, message, msg_length);
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str nl = &new_line;
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int nl_length = nl.length;
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write(term, nl, nl_length);
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return
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} |