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annotate docs/man3/SDL_SetGamma.3 @ 3:3b97b708523c

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author Sam Lantinga <slouken@lokigames.com>
date Thu, 26 Apr 2001 16:52:42 +0000
parents 74212992fb08
children 55f1f1b3e27d
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1 .TH "SDL_SetGamma" "3" "Mon 12 Mar 2001, 01:04" "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, Mon 12 Mar 2001, 01:04