Initial commit

Vec3f.c

@@ -0,0 +1,109 @@
+#include "CgeMath.h"
+#include <string.h>
+#include <math.h>
+
+#define SET_ROW(row, val) row[0] = row[1] = row[2] = val
+
+void CgeVec3fAdd(const float a[3], const float b[3], float out[3]) {
+    out[0] = a[0] + b[0];
+    out[1] = a[1] + b[1];
+    out[2] = a[2] + b[2];
+}
+
+void CgeVec3fSub(const float a[3], const float b[3], float out[3]) {
+    out[0] = a[0] - b[0];
+    out[1] = a[1] - b[1];
+    out[2] = a[2] - b[2];
+}
+
+void CgeVec3fMul(const float a[3], const float b[3], float out[3]) {
+    out[0] = a[0] * b[0];
+    out[1] = a[1] * b[1];
+    out[2] = a[2] * b[2];
+}
+
+void CgeVec3fScale(const float a[3], float b, float out[3]) {
+    out[0] = a[0] * b;
+    out[1] = a[1] * b;
+    out[2] = a[2] * b;
+}
+
+void CgeVec3fMulAdd(const float a[3], const float b[3], const float c[3],
+                    float out[3]) {
+    out[0] = a[0] * b[0] + c[0];
+    out[1] = a[1] * b[1] + c[1];
+    out[2] = a[2] * b[2] + c[2];
+}
+
+void CgeVec3fNegate(const float in[3], float out[3]) {
+    out[0] = -in[0];
+    out[1] = -in[1];
+    out[2] = -in[2];
+}
+
+float CgeVec3fDot(const float a[3], const float b[3]) {
+    return a[0] * b[0] + a[1] * b[1] + a[2] * b[2];
+}
+
+void CgeVec3fCross(const float a[3], const float b[3], float out[3]) {
+    float tmp[3];
+
+    tmp[0] = a[1] * b[2] - a[2] * b[1];
+    tmp[1] = a[2] * b[0] - a[0] * b[2];
+    tmp[2] = a[0] * b[1] - a[1] * b[0];
+    memcpy(out, tmp, sizeof(tmp));
+}
+
+float CgeVec3fLength(const float in[3]) {
+    return sqrtf(CgeVec3fDot(in, in));
+}
+
+void CgeVec3fNormal(const float in[3], float out[3]) {
+    CgeVec3fScale(in, 1.0f / CgeVec3fLength(in), out);
+}
+
+float CgeVec3fNormalEx(const float in[3], float out[3]) {
+    float length;
+
+    length = CgeVec3fLength(in);
+    CgeVec3fScale(in, 1.0f / length, out);
+    return length;
+}
+
+void CgeVec3fMin(const float a[3], const float b[3], float out[3]) {
+    if (a[0] < b[0]) out[0] = a[0]; else out[0] = b[0];
+    if (a[1] < b[1]) out[1] = a[1]; else out[1] = b[1];
+    if (a[2] < b[2]) out[2] = a[2]; else out[2] = b[2];
+}
+
+void CgeVec3fMax(const float a[3], const float b[3], float out[3]) {
+    if (a[0] > b[0]) out[0] = a[0]; else out[0] = b[0];
+    if (a[1] > b[1]) out[1] = a[1]; else out[1] = b[1];
+    if (a[2] > b[2]) out[2] = a[2]; else out[2] = b[2];
+}
+
+void CgeVec3fLerp(const float a[3], const float b[3], float t, float out[3]) {
+    float tmp[3];
+
+    CgeVec3fSub(b, a, tmp);
+    CgeVec3fScale(tmp, t, tmp);
+    CgeVec3fAdd(a, tmp, out);
+}
+
+void CgeVec3fProject(const float a[3], const float b[3], float out[3]) {
+    float amount;
+
+    amount = CgeVec3fDot(a, b) / CgeVec3fDot(b, b);
+    CgeVec3fScale(b, amount, out);
+}
+
+void CgeVec3fBarycentric(const float a[3], const float b[3], const float c[3],
+                         float v, float w, float out[3]) {
+    float tmp1[3], tmp2[3];
+    float u;
+
+    u = 1.0f - v - w;
+    SET_ROW(tmp1, u); CgeVec3fMul(a, tmp1, tmp2);
+    SET_ROW(tmp1, v); CgeVec3fMulAdd(b, tmp1, tmp2, tmp2);
+    SET_ROW(tmp1, w); CgeVec3fMulAdd(c, tmp1, tmp2, out);
+}