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annotate docs/man3/SDL_SetGamma.3 @ 4347:38f22ed3a433 SDL-1.2

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Option to fix bug #851 For some people setting the period size works better (and is what SDL 1.2.13 did), but for most people it's the same or worse. You can use an environment variable to pick which one you want.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 17 Oct 2009 06:55:17 +0000
parents 1238da4a7112
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e5bc29de3f0a Updated from the SDL Documentation Project
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1 .TH "SDL_SetGamma" "3" "Tue 11 Sep 2001, 23:01" "SDL" "SDL API Reference"
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2 .SH "NAME"
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3 SDL_SetGamma \- Sets the color gamma function for the display
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4 .SH "SYNOPSIS"
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5 .PP
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6 \fB#include "SDL\&.h"
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7 .sp
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8 \fBint \fBSDL_SetGamma\fP\fR(\fBfloat redgamma, float greengamma, float bluegamma\fR);
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9 .SH "DESCRIPTION"
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10 .PP
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11 Sets the "gamma function" for the display of each color component\&. Gamma controls the brightness/contrast of colors displayed on the screen\&. A gamma value of 1\&.0 is identity (i\&.e\&., no adjustment is made)\&.
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12 .PP
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13 This function adjusts the gamma based on the "gamma function" parameter, you can directly specify lookup tables for gamma adjustment with \fISDL_SetGammaRamp\fR\&.
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14 .PP
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15 Not all display hardware is able to change gamma\&.
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16 .SH "RETURN VALUE"
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17 .PP
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18 Returns -1 on error (or if gamma adjustment is not supported)\&.
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19 .SH "SEE ALSO"
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20 .PP
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21 \fISDL_GetGammaRamp\fR \fISDL_SetGammaRamp\fR
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22 .\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01