Allows you to add custom buttons to your MOD
Step 1: open file input.cpp
you need to first create a variable, typically global to the file which is a "kbutton_t"
you'll find a lot of these declared at once in input.cpp, so add something like:
Or whatever you want to call it
Step 2: Specify the Command you want to use
Each button has a command, e.g. attack has +attack as a console command
You need to create a command in console from it as well, you can do this by using pfnAddCommand()
Although first you need to make a function which just makes the key down or up (pressed or released)
So you need to make TWO functions and TWO pfnAddCommand statements. Have a look...
// pressed button
KeyDown( &in_my_new_button );
// released button
KeyUp( &in_my_new_button );
There is also a place in input.cpp where a lot of pfnAddCommand()'s are made. Add your commands there.
you need to specify the command you want it to be and the name of the function which deals with it that you just made above. For example:
gEngfuncs.pfnAddCommand ("+my_button", IN_My_New_Button_Down);
gEngfuncs.pfnAddCommand ("-my_button", IN_My_New_Button_Up);
remember your button whatever you want.
Step 3: Giving the button an ID
Each button has a cont=stant identification to know what buttons are pressed. e.g. Attack has the constant IN_ATTACK, we want to make our own.
Now you should make a new bit for your button that will work with 'pev->button' in entvars.
Define it in input.h, as follows:
#define IN_MY_NEW_BUTTON (1<<16)
Step 4: Check if button is pressed
That's your new button's bit mask set that you can check in game if it is pressed.
Now you've done that you can go down into the CL_ButtonBits() function. Like this:
int CL_ButtonBits( int bResetState )
Add some new code to add your new bitmask to the bits pressed when your button in_my_new_button's state is 3 (i Think!)
Here is an example:
if ( in_my_new_button.state & 3 )
bits |= IN_MY_NEW_BUTTON;
Step 5: Resetting the button State
You also have to add the button when your resetting the state at the bottom of the function.. where it has all of this stuff..
if ( bResetState )
in_attack.state &= ~2;
in_duck.state &= ~2;
so now just add..
in_my_new_button.state &= ~2;
That's it. You have just codified your first button in Half-life. Congratulation!!!