From: havoc <havoc@d7cf8633-e32d-0410-b094-e92efae38249>
Date: Thu, 29 Dec 2005 08:43:50 +0000 (+0000)
Subject: eliminated special case for gamma 1.0 as it was making worse gamma ramps than the... 
X-Git-Tag: xonotic-v0.1.0preview~4413
X-Git-Url: http://de.git.xonotic.org/?p=xonotic%2Fdarkplaces.git;a=commitdiff_plain;h=a9fc7c56ca413323bb1973c4629fed10e08d13f7

eliminated special case for gamma 1.0 as it was making worse gamma ramps than the general case, and tweaked the code a bit to round to nearest so it should hit exactly 65535


git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@5874 d7cf8633-e32d-0410-b094-e92efae38249
---

diff --git a/palette.c b/palette.c
index c536b332..8996f011 100644
--- a/palette.c
+++ b/palette.c
@@ -112,54 +112,28 @@ void Palette_SetupSpecialPalettes(void)
 void BuildGammaTable8(float prescale, float gamma, float scale, float base, unsigned char *out)
 {
 	int i, adjusted;
-	double invgamma, d;
+	double invgamma;
 
-	gamma = bound(0.1, gamma, 5.0);
-	if (gamma == 1) // LordHavoc: dodge the math
-	{
-		for (i = 0;i < 256;i++)
-		{
-			adjusted = (int) (i * prescale * scale + base * 255.0);
-			out[i] = bound(0, adjusted, 255);
-		}
-	}
-	else
+	invgamma = 1.0 / gamma;
+	prescale /= 255.0f;
+	for (i = 0;i < 256;i++)
 	{
-		invgamma = 1.0 / gamma;
-		prescale /= 255.0f;
-		for (i = 0;i < 256;i++)
-		{
-			d = pow((double) i * prescale, invgamma) * scale + base;
-			adjusted = (int) (255.0 * d);
-			out[i] = bound(0, adjusted, 255);
-		}
+		adjusted = (int) (255.0 * (pow((double) i * prescale, invgamma) * scale + base) + 0.5);
+		out[i] = bound(0, adjusted, 255);
 	}
 }
 
 void BuildGammaTable16(float prescale, float gamma, float scale, float base, unsigned short *out)
 {
 	int i, adjusted;
-	double invgamma, d;
+	double invgamma;
 
-	gamma = bound(0.1, gamma, 5.0);
-	if (gamma == 1) // LordHavoc: dodge the math
-	{
-		for (i = 0;i < 256;i++)
-		{
-			adjusted = (int) (i * 256.0 * prescale * scale + base * 65535.0);
-			out[i] = bound(0, adjusted, 65535);
-		}
-	}
-	else
+	invgamma = 1.0 / gamma;
+	prescale /= 255.0f;
+	for (i = 0;i < 256;i++)
 	{
-		invgamma = 1.0 / gamma;
-		prescale /= 255.0f;
-		for (i = 0;i < 256;i++)
-		{
-			d = pow((double) i * prescale, invgamma) * scale + base;
-			adjusted = (int) (65535.0 * d);
-			out[i] = bound(0, adjusted, 65535);
-		}
+		adjusted = (int) (65535.0 * (pow((double) i * prescale, invgamma) * scale + base) + 0.5);
+		out[i] = bound(0, adjusted, 65535);
 	}
 }