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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 86d0d01290ea
children 0175d3eeae89
line wrap: on
line source


## Makefile.am for the SDL video library

noinst_LTLIBRARIES = libvideo.la

# Define which subdirectories need to be built
SUBDIRS = @VIDEO_SUBDIRS@
DIST_SUBDIRS = dummy x11 dga nanox fbcon directfb vgl svga ggi aalib \
               wincommon windib windx5 \
               maccommon macdsp macrom riscos quartz \
               bwindow ps2gs photon cybergfx epoc picogui \
               ataricommon xbios gem dc qtopia XFree86 wscons gapi \
               ipod os2fslib

DRIVERS = @VIDEO_DRIVERS@

# Include the architecture-independent sources
COMMON_SRCS =			\
	SDL_RLEaccel.c		\
	SDL_RLEaccel_c.h	\
	SDL_blit.c		\
	SDL_blit.h		\
	SDL_blit_0.c		\
	SDL_blit_1.c		\
	SDL_blit_A.c		\
	SDL_blit_N.c		\
	SDL_bmp.c		\
	SDL_cursor.c		\
	SDL_cursor_c.h		\
	SDL_gamma.c		\
	SDL_glfuncs.h		\
	SDL_leaks.h		\
	SDL_memops.h		\
	SDL_pixels.c		\
	SDL_pixels_c.h		\
	SDL_surface.c		\
	SDL_stretch.c		\
	SDL_stretch_c.h		\
	SDL_sysvideo.h		\
	SDL_video.c		\
	SDL_yuv.c		\
	SDL_yuvfuncs.h		\
	SDL_yuv_sw.c		\
	SDL_yuv_sw_c.h		\
	SDL_yuv_mmx.c		\
	mmx.h			\
	blank_cursor.h		\
	default_cursor.h

libvideo_la_SOURCES = $(COMMON_SRCS)
libvideo_la_LIBADD = $(DRIVERS)
libvideo_la_DEPENDENCIES = $(DRIVERS)