Make collision code placement more like original (+ small fixes)

src/collision/CompressedVector.h

@@ -0,0 +1,36 @@
+#pragma once
+
+struct CompressedVector
+{
+#ifdef COMPRESSED_COL_VECTORS
+	int16 x, y, z;
+	CVector Get(void) const { return CVector(x, y, z)/128.0f; };
+	void Set(float x, float y, float z) { this->x = x*128.0f; this->y = y*128.0f; this->z = z*128.0f; };
+#ifdef GTA_PS2
+	void Unpack(uint128 &qword) const {
+		__asm__ volatile (
+			"lh      $8, 0(%1)\n"
+			"lh      $9, 2(%1)\n"
+			"lh      $10, 4(%1)\n"
+			"pextlw  $10, $8\n"
+			"pextlw  $2, $9, $10\n"
+			"sq      $2, %0\n"
+			: "=m" (qword)
+			: "r" (this)
+			: "$8", "$9", "$10", "$2"
+		);
+	}
+#else
+	void Unpack(int32 *qword) const {
+		qword[0] = x;
+		qword[1] = y;
+		qword[2] = z;
+		qword[3] = 0;	// junk
+	}
+#endif
+#else
+	float x, y, z;
+	CVector Get(void) const { return CVector(x, y, z); };
+	void Set(float x, float y, float z) { this->x = x; this->y = y; this->z = z; };
+#endif
+};