test/testendian.c
author Patrice Mandin <patmandin@gmail.com>
Thu, 19 Jan 2006 21:28:52 +0000
changeset 1257 448a9a64537b
parent 850 c203b4a42701
child 1405 983df4f9c1c6
permissions -rw-r--r--
[PATCH] SDL_GetVideoMode() does not find best mode, part 2

Following commit 1.51, I come accross a problem when SDL must choose between
several video modes that could suit the one asked.

If I ask 320x240 with this list:
768x480 768x240 640x400 640x200 384x480 384x240 320x400 320x200

The smallest selectables modes are 384x240 and 320x400. And SDL choose the later
in this list, but 384x240 is more suitable. So I added a check to compare
the pixel count (surface) of modes, and select the one which has the smallest
pixel count.

In my example, 384x240 has 92160 pixels, and 320x400 has 128000 pixels. So now
SDL will choose 384x240 for the asked 320x240 mode.
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/* Test program to check SDL's CPU endian detection and byte swapping routines */
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#include <stdio.h>
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#include "SDL.h"
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#include "SDL_endian.h"
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int main(int argc, char *argv[])
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{
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	Uint16 value16 = 0xCDAB;
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	Uint32 value32 = 0xEFBEADDE;
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#if defined(__GNUC__) && defined(SDL_HAS_64BIT_TYPE)
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	Uint64 value64 = 0xEFBEADDECDAB3412LL;
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#endif
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	printf("This is a %s endian machine.\n",
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		(SDL_BYTEORDER == SDL_LIL_ENDIAN) ? "little" : "big");
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	printf("Value 16 = 0x%X, swapped = 0x%X\n", value16, SDL_Swap16(value16));
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	printf("Value 32 = 0x%X, swapped = 0x%X\n", value32, SDL_Swap32(value32));
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#if defined(__GNUC__) && defined(SDL_HAS_64BIT_TYPE)
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	printf("Value 64 = 0x%llX, swapped = 0x%llX\n", value64, SDL_Swap64(value64));
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#endif
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	return(0);
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}