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te: Thu, 17 Apr 2003 11:25:26 -0700 From: "Jim" Subject: [SDL] Frame buffer patches... Would seem that GCC 3.2.2 promotes all signed values to unsigned if any single vlaue is unsigned in an expression... for instance when calculating an elo touch position....evertyhign is an (int) except for cach_vinfo.xres which is unsigned. THerefore if y ou reverse the SDL_ELO_MIN_X and SDL_ELO_MAX_X values the resulging negative value pegs the expression to it's max. Attached it the accumu lated patch to typecast the unsigned values to (int) - *dx = (cache_vinfo.xres - (cache_vinfo.xres * (input_x - ELO_MIN_X)) / width); + *dx = ((int)cache_vinfo.xres - ((int)cache_vinfo.xres * (input_x - ELO_MIN_X)) / width); and also to provide quite failure to operations which have the screen currently locked... The touch screen I'm using the original values were exactly opposite of any position I touched on the screen - evaluating the math the expr ession SHOULD have handled reversing the min and max values - and after casting the unsigned .xres and .yres to a signed int - worked well. .. Jim
author Sam Lantinga <slouken@libsdl.org>
date Tue, 24 Jan 2006 06:36:43 +0000
parents 355632dca928
children
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<HTML
><HEAD
><TITLE
>SDL_JoystickEventState</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
"><LINK
REL="HOME"
TITLE="SDL Library Documentation"
HREF="index.html"><LINK
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TITLE="Event Functions."
HREF="eventfunctions.html"><LINK
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TITLE="SDL_GetAppState"
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TITLE="Joystick"
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><H1
><A
NAME="SDLJOYSTICKEVENTSTATE"
></A
>SDL_JoystickEventState</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN5969"
></A
><H2
>Name</H2
>SDL_JoystickEventState&nbsp;--&nbsp;Enable/disable joystick event polling</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN5972"
></A
><H2
>Synopsis</H2
><DIV
CLASS="FUNCSYNOPSIS"
><A
NAME="AEN5973"
></A
><P
></P
><PRE
CLASS="FUNCSYNOPSISINFO"
>#include "SDL.h"</PRE
><P
><CODE
><CODE
CLASS="FUNCDEF"
>int <B
CLASS="FSFUNC"
>SDL_JoystickEventState</B
></CODE
>(int state);</CODE
></P
><P
></P
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN5979"
></A
><H2
>Description</H2
><P
>This function is used to enable or disable joystick event processing. With joystick event processing disabled you will have to update joystick states with <A
HREF="sdljoystickupdate.html"
><TT
CLASS="FUNCTION"
>SDL_JoystickUpdate</TT
></A
> and read the joystick information manually. <TT
CLASS="PARAMETER"
><I
>state</I
></TT
> is either <TT
CLASS="LITERAL"
>SDL_QUERY</TT
>, <TT
CLASS="LITERAL"
>SDL_ENABLE</TT
> or <TT
CLASS="LITERAL"
>SDL_IGNORE</TT
>.</P
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Note: </B
>Joystick event handling is prefered</P
></BLOCKQUOTE
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN5990"
></A
><H2
>Return Value</H2
><P
>If <TT
CLASS="PARAMETER"
><I
>state</I
></TT
> is <TT
CLASS="LITERAL"
>SDL_QUERY</TT
> then the current state is returned, otherwise the new processing <TT
CLASS="PARAMETER"
><I
>state</I
></TT
> is returned.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN5996"
></A
><H2
>See Also</H2
><P
><A
HREF="joystick.html"
>SDL Joystick Functions</A
>,
<A
HREF="sdljoystickupdate.html"
><TT
CLASS="FUNCTION"
>SDL_JoystickUpdate</TT
></A
>,
<A
HREF="sdljoyaxisevent.html"
><SPAN
CLASS="STRUCTNAME"
>SDL_JoyAxisEvent</SPAN
></A
>,
<A
HREF="sdljoyballevent.html"
><SPAN
CLASS="STRUCTNAME"
>SDL_JoyBallEvent</SPAN
></A
>,
<A
HREF="sdljoybuttonevent.html"
><SPAN
CLASS="STRUCTNAME"
>SDL_JoyButtonEvent</SPAN
></A
>,
<A
HREF="sdljoyhatevent.html"
><SPAN
CLASS="STRUCTNAME"
>SDL_JoyHatEvent</SPAN
></A
></P
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