1 files changed, 212 insertions, 0 deletions

diff --git a/src/common/math_util.cpp b/src/common/math_util.cpp
new file mode 100644
index 000000000..da90f8d74
--- /dev/null
+++ b/src/common/math_util.cpp
@@ -0,0 +1,212 @@
+// Copyright 2013 Dolphin Emulator Project
+// Licensed under GPLv2
+// Refer to the license.txt file included.
+
+
+#include "common.h"
+#include "math_util.h"
+
+#include <cmath>
+#include <numeric>
+
+namespace MathUtil
+{
+
+u32 ClassifyDouble(double dvalue)
+{
+    // TODO: Optimize the below to be as fast as possible.
+    IntDouble value;
+    value.d = dvalue;
+    u64 sign = value.i & DOUBLE_SIGN;
+    u64 exp  = value.i & DOUBLE_EXP;
+    if (exp > DOUBLE_ZERO && exp < DOUBLE_EXP) 
+    {
+        // Nice normalized number.
+        return sign ? PPC_FPCLASS_NN : PPC_FPCLASS_PN;
+    }
+    else
+    {
+        u64 mantissa = value.i & DOUBLE_FRAC;
+        if (mantissa)
+        {
+            if (exp)
+            {
+                return PPC_FPCLASS_QNAN;
+            }
+            else
+            {
+                // Denormalized number.
+                return sign ? PPC_FPCLASS_ND : PPC_FPCLASS_PD;
+            }
+        }
+        else if (exp)
+        {
+            //Infinite
+            return sign ? PPC_FPCLASS_NINF : PPC_FPCLASS_PINF;
+        }
+        else
+        {
+            //Zero
+            return sign ? PPC_FPCLASS_NZ : PPC_FPCLASS_PZ;
+        }
+    }
+}
+
+u32 ClassifyFloat(float fvalue)
+{
+    // TODO: Optimize the below to be as fast as possible.
+    IntFloat value;
+    value.f = fvalue;
+    u32 sign = value.i & FLOAT_SIGN;
+    u32 exp  = value.i & FLOAT_EXP;
+    if (exp > FLOAT_ZERO && exp < FLOAT_EXP) 
+    {
+        // Nice normalized number.
+        return sign ? PPC_FPCLASS_NN : PPC_FPCLASS_PN;
+    }
+    else
+    {
+        u32 mantissa = value.i & FLOAT_FRAC;
+        if (mantissa)
+        {
+            if (exp)
+            {
+                return PPC_FPCLASS_QNAN; // Quiet NAN
+            }
+            else
+            {
+                // Denormalized number.
+                return sign ? PPC_FPCLASS_ND : PPC_FPCLASS_PD;
+            }
+        } 
+        else if (exp) 
+        {
+            // Infinite
+            return sign ? PPC_FPCLASS_NINF : PPC_FPCLASS_PINF;
+        } 
+        else 
+        {
+            //Zero
+            return sign ? PPC_FPCLASS_NZ : PPC_FPCLASS_PZ;
+        }
+    }
+}
+
+
+}  // namespace
+
+inline void MatrixMul(int n, const float *a, const float *b, float *result)
+{
+    for (int i = 0; i < n; ++i)
+    {
+        for (int j = 0; j < n; ++j)
+        {
+            float temp = 0;
+            for (int k = 0; k < n; ++k)
+            {
+                temp += a[i * n + k] * b[k * n + j];
+            }
+            result[i * n + j] = temp;
+        }
+    }
+}
+
+// Calculate sum of a float list
+float MathFloatVectorSum(const std::vector<float>& Vec)
+{
+    return std::accumulate(Vec.begin(), Vec.end(), 0.0f);
+}
+
+void Matrix33::LoadIdentity(Matrix33 &mtx)
+{
+    memset(mtx.data, 0, sizeof(mtx.data));
+    mtx.data[0] = 1.0f;
+    mtx.data[4] = 1.0f;
+    mtx.data[8] = 1.0f;
+}
+
+void Matrix33::RotateX(Matrix33 &mtx, float rad)
+{
+    float s = sin(rad);
+    float c = cos(rad);
+    memset(mtx.data, 0, sizeof(mtx.data));
+    mtx.data[0] = 1;
+    mtx.data[4] = c;
+    mtx.data[5] = -s;
+    mtx.data[7] = s;
+    mtx.data[8] = c;
+}
+void Matrix33::RotateY(Matrix33 &mtx, float rad)
+{
+    float s = sin(rad);
+    float c = cos(rad);
+    memset(mtx.data, 0, sizeof(mtx.data));
+    mtx.data[0] = c;
+    mtx.data[2] = s;
+    mtx.data[4] = 1;
+    mtx.data[6] = -s;    
+    mtx.data[8] = c;
+}
+
+void Matrix33::Multiply(const Matrix33 &a, const Matrix33 &b, Matrix33 &result)
+{
+    MatrixMul(3, a.data, b.data, result.data);
+}
+
+void Matrix33::Multiply(const Matrix33 &a, const float vec[3], float result[3])
+{
+    for (int i = 0; i < 3; ++i) {
+        result[i] = 0;
+        for (int k = 0; k < 3; ++k) {
+            result[i] += a.data[i * 3 + k] * vec[k];
+        }
+    }
+}
+
+void Matrix44::LoadIdentity(Matrix44 &mtx)
+{
+    memset(mtx.data, 0, sizeof(mtx.data));
+    mtx.data[0] = 1.0f;
+    mtx.data[5] = 1.0f;
+    mtx.data[10] = 1.0f;
+    mtx.data[15] = 1.0f;
+}
+
+void Matrix44::LoadMatrix33(Matrix44 &mtx, const Matrix33 &m33)
+{
+    for (int i = 0; i < 3; ++i)
+    {
+        for (int j = 0; j < 3; ++j)
+        {
+            mtx.data[i * 4 + j] = m33.data[i * 3 + j];
+        }
+    }
+
+    for (int i = 0; i < 3; ++i)
+    {
+        mtx.data[i * 4 + 3] = 0;
+        mtx.data[i + 12] = 0;
+    }
+    mtx.data[15] = 1.0f;
+}
+
+void Matrix44::Set(Matrix44 &mtx, const float mtxArray[16])
+{
+    for(int i = 0; i < 16; ++i) {
+        mtx.data[i] = mtxArray[i];
+    }
+}
+
+void Matrix44::Translate(Matrix44 &mtx, const float vec[3])
+{
+    LoadIdentity(mtx);
+    mtx.data[3] = vec[0];
+    mtx.data[7] = vec[1];
+    mtx.data[11] = vec[2];
+}
+
+void Matrix44::Multiply(const Matrix44 &a, const Matrix44 &b, Matrix44 &result)
+{
+    MatrixMul(4, a.data, b.data, result.data);
+}
+