mouse_pos
Global variable with the mouse position/button state.
Description
Global variables containing the current mouse position and button state.
Wherever possible these values will be updated asynchronously, but if
mouse_needs_poll() returns TRUE, you must manually call poll_mouse() to
update them with the current input state. The `mouse_x' and `mouse_y'
positions are integers ranging from zero to the bottom right corner of
the screen. The `mouse_z' variable holds the current wheel position, when
using an input driver that supports wheel mice. The `mouse_b' variable is
a bitfield indicating the state of each button: bit 0 is the left button,
bit 1 the right, and bit 2 the middle button. Additional non standard
mouse buttons might be available as higher bits in this variable. Usage
example:
if (mouse_b & 1)
printf("Left button is pressed\n");
if (!(mouse_b & 2))
printf("Right button is not pressed\n");
The `mouse_pos' variable has the current X coordinate in the upper 16 bits
and the Y in the lower 16 bits. This may be useful in tight polling loops
where a mouse interrupt could occur between your reading of the two
separate variables, since you can copy this value into a local variable
with a single instruction and then split it up at your leisure. Example:
int pos, x, y;
pos = mouse_pos;
x = pos >> 16;
y = pos & 0x0000ffff;
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