Initial commit

Box2f.c

@@ -0,0 +1,56 @@
+#include "CgeMath.h"
+#include <string.h>
+
+#define EPSILON 0.00001f
+#define PI      3.14159265358979323846f
+
+void CgeBox2fUnion(const float aMin[2], const float aMax[2],
+                   const float bMin[2], const float bMax[2],
+                   float outMin[2], float outMax[2]) {
+    CgeVec2fMin(aMin, bMin, outMin);
+    CgeVec2fMax(aMax, bMax, outMax);
+}
+
+int CgeBox2fIntersect(const float aMin[2], const float aMax[2],
+                      const float bMin[2], const float bMax[2],
+                      float outMin[2], float outMax[2]) {
+    CgeVec2fMax(aMin, bMin, outMin);
+    CgeVec2fMin(aMax, bMax, outMax);
+
+    if (outMin[0] >= outMax[0] || outMin[1] >= outMax[1])
+        return 0;
+
+    return 1;
+}
+
+int CgeBox2fContains(const float aMin[2], const float aMax[2],
+                     const float point[2]) {
+    if (point[0] < aMin[0] || point[1] < aMin[1])
+        return 0;
+
+    if (point[0] > aMax[0] || point[1] > aMax[1])
+        return 0;
+
+    return 1;
+}
+
+int CgeBox2fEnclose(const float *points, size_t size, float outMin[2],
+                    float outMax[2]) {
+    float tmp1[2], tmp2[2];
+    size_t i;
+
+    if (!size)
+        return 0;
+
+    memcpy(tmp1, points, sizeof(tmp1));
+    memcpy(tmp2, points, sizeof(tmp2));
+
+    for (i = 1; i < size; i++) {
+        CgeVec2fMin(tmp1, points + i * 2, tmp1);
+        CgeVec2fMax(tmp2, points + i * 2, tmp2);
+    }
+
+    memcpy(outMin, tmp1, sizeof(tmp1));
+    memcpy(outMax, tmp2, sizeof(tmp2));
+    return 1;
+}