Arachnoid GLESv1.1 plugin. Compile and run (a bit glitchy and no frameskip) on the...

[mupen64plus-pandora.git] / source / mupen64plus-video-arachnoid / src / math / MathLib.h

diff --git a/source/mupen64plus-video-arachnoid/src/math/MathLib.h b/source/mupen64plus-video-arachnoid/src/math/MathLib.h
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index 0000000..cf9e393
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+++ b/source/mupen64plus-video-arachnoid/src/math/MathLib.h
@@ -0,0 +1,100 @@
+/******************************************************************************
+ * Arachnoid Graphics Plugin for Mupen64Plus
+ * http://bitbucket.org/wahrhaft/mupen64plus-video-arachnoid/
+ *
+ * Copyright (C) 2007 Kristofer Karlsson, Rickard Niklasson
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *****************************************************************************/
+
+#ifndef MATH_LIBRARY_H_
+#define MATH_LIBRARY_H_
+
+#include <cmath>     //sqrtf
+#include "m64p.h"  
+
+// Formula: a.b = a0*b0 + a1*b1 + a2*b2
+#define Vec3Dot(a,b)         ((a)[0]*(b)[0]+(a)[1]*(b)[1]+(a)[2]*(b)[2])
+
+#define Vec3Normalize(v) { \
+    float lenght = (v)[0]*(v)[0]+(v)[1]*(v)[1]+(v)[2]*(v)[2]; \
+    if ( lenght > 0.00001f ) { \
+        lenght = 1.0f / sqrt(lenght); \
+        (v)[0] *= lenght; \
+        (v)[1] *= lenght; \
+        (v)[2] *= lenght; \
+    } \
+}
+
+
+//-----------------------------------------------------------------------------
+// Transform Vector
+//-----------------------------------------------------------------------------
+
+inline void transformVertex( float* m, float* v, float* out )
+{
+    float x = v[0];
+    float y = v[1];
+    float z = v[2];
+    out[0] = m[0] * x + m[4] * y + m[8]  * z + m[12]; 
+    out[1] = m[1] * x + m[5] * y + m[9]  * z + m[13];
+    out[2] = m[2] * x + m[6] * y + m[10] * z + m[14];
+    out[3] = m[3] * x + m[7] * y + m[11] * z + m[15];
+}
+
+inline void transformVector( float* m, float* v, float* out )
+{
+    float x = v[0];
+    float y = v[1];
+    float z = v[2];
+    out[0] = m[0] * x + m[4] * y + m[8]  * z; 
+    out[1] = m[1] * x + m[5] * y + m[9]  * z;
+    out[2] = m[2] * x + m[6] * y + m[10] * z;
+}
+
+
+
+//-----------------------------------------------------------------------------
+// Random Float
+//-----------------------------------------------------------------------------
+inline float randomFloat(float min, float max)
+{
+    return (float)( min + double(max-min)*rand()/RAND_MAX );
+}
+
+inline unsigned int pow2( unsigned int dim )
+{
+    unsigned int i = 1;
+
+    while (i < dim) i <<= 1;
+
+    return i;
+}
+
+inline unsigned int powof( unsigned int dim )
+{
+    unsigned int num = 1;
+    unsigned int i = 0;
+
+    while (num < dim)
+    {
+        num <<= 1;
+        i++;
+    }
+
+    return i;
+}
+
+#endif