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Added invertGreen( normalmap.png ) material keyword

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This commit is contained in:
Robert Beckebans 2021-03-27 22:17:05 +01:00
parent 9ce36e420a
commit 8f82bb0fb9
1 changed files with 35 additions and 0 deletions
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35
neo/renderer/Image_program.cpp
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@ -185,6 +185,24 @@ static void R_InvertAlpha( byte* data, int width, int height )
}
}
/*
=================
R_InvertGreen
=================
*/
static void R_InvertGreen( byte* data, int width, int height )
{
int i;
int c;
c = width * height * 4;
for( i = 0 ; i < c ; i += 4 )
{
data[i + 1] = 255 - data[i + 1];
}
}
/*
=================
R_InvertColor
@ -608,6 +626,23 @@ static bool R_ParseImageProgram_r( idLexer& src, byte** pic, int* width, int* he
return true;
}
// RB: invertGreen to allow flipping the Y-Axis of normal maps
if( !token.Icmp( "invertGreen" ) )
{
MatchAndAppendToken( src, "(" );
R_ParseImageProgram_r( src, pic, width, height, timestamps, usage );
// process it
if( pic )
{
R_InvertGreen( *pic, *width, *height );
}
MatchAndAppendToken( src, ")" );
return true;
}
if( !token.Icmp( "invertColor" ) )
{
MatchAndAppendToken( src, "(" );