Second Life viewer sources 1.13.2.12

1 files changed, 85 insertions, 0 deletions

diff --git a/linden/indra/newview/noise.cpp b/linden/indra/newview/noise.cpp
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+++ b/linden/indra/newview/noise.cpp
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+/** 
+ * @file noise.cpp
+ * @brief Perlin noise routines for procedural textures, etc
+ *
+ * Copyright (c) 2000-2007, Linden Research, Inc.
+ * 
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlife.com/developers/opensource/gplv2
+ * 
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at http://secondlife.com/developers/opensource/flossexception
+ * 
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ * 
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ */
+
+#include "llviewerprecompiledheaders.h"
+
+#include "noise.h"
+
+#include "llrand.h"
+
+// static
+#define B 0x100
+S32 p[B + B + 2];
+F32 g3[B + B + 2][3];
+F32 g2[B + B + 2][2];
+F32 g1[B + B + 2];
+S32 gNoiseStart = 1;
+
+
+F32 noise2(F32 *vec)
+{
+        U8 bx0, bx1, by0, by1;
+        U32 b00, b10, b01, b11;
+        F32 rx0, rx1, ry0, ry1, *q, sx, sy, a, b, u, v;
+        S32 i, j;
+
+        if (gNoiseStart) {
+                gNoiseStart = 0;
+                init();
+        }
+
+
+        fast_setup(*vec, bx0, bx1, rx0, rx1);
+        fast_setup(*(vec + 1), by0, by1, ry0, ry1);
+
+        i = *(p + bx0);
+        j = *(p + bx1);
+
+        b00 = *(p + i + by0);
+        b10 = *(p + j + by0);
+        b01 = *(p + i + by1);
+        b11 = *(p + j + by1);
+
+        sx = s_curve(rx0);
+        sy = s_curve(ry0);
+
+
+        q = *(g2 + b00);
+        u = fast_at2(rx0, ry0, q);
+        q = *(g2 + b10); 
+        v = fast_at2(rx1, ry0, q);
+        a = lerp_m(sx, u, v);
+
+        q = *(g2 + b01); 
+        u = fast_at2(rx0,ry1,q);
+        q = *(g2 + b11); 
+        v = fast_at2(rx1,ry1,q);
+        b = lerp_m(sx, u, v);
+
+        return lerp_m(sy, a, b);
+}
+