1 files changed, 51 insertions, 0 deletions
diff --git a/src/render/WindModifiers.cpp b/src/render/WindModifiers.cpp
new file mode 100644
index 00000000..2061df6a
--- /dev/null
+++ b/src/render/WindModifiers.cpp
@@ -0,0 +1,51 @@
+#include "common.h"
+#include "WindModifiers.h"
+#include "Camera.h"
+#include "General.h"
+
+#define MAX_HEIGHT_DIST 40.0f
+#define MIN_FADE_DIST 20.0f
+#define MAX_FADE_DIST 50.0f
+
+CWindModifiers Array[16];
+int32 CWindModifiers::Number;
+
+void
+CWindModifiers::RegisterOne(CVector pos, int32 type = 1)
+{
+	if (CWindModifiers::Number < 16 && (pos - TheCamera.GetPosition()).Magnitude() < 100.0f) {
+		Array[Number].m_pos = pos;
+		Array[Number].m_type = type;
+		Number++;
+	}
+}
+
+bool
+CWindModifiers::FindWindModifier(CVector pos, float *x, float *y)
+{
+	bool bWasWindModifierFound = false;
+	CVector2D dir;
+	for (int i = 0; i < Number; i++) {
+		if (Array[i].m_type == 1) {
+			float zDist = Abs(15.0f + pos.z - Array[i].m_pos.z);
+
+			if (zDist < MAX_HEIGHT_DIST) {
+				float dist = (pos - Array[i].m_pos).Magnitude();
+				if (dist < MAX_FADE_DIST) {
+					float distFade = dist < MIN_FADE_DIST ? 1.0f : 1.0f - (dist - MIN_FADE_DIST) / (MAX_FADE_DIST - MIN_FADE_DIST);
+					float heightFade = 1.0f - zDist / MAX_HEIGHT_DIST;
+					dir = (pos - Array[i].m_pos) * heightFade / dist;
+					bWasWindModifierFound = true;
+				}
+			}
+		}
+	}
+
+	if (bWasWindModifierFound) {
+		float directionMult = ((CGeneral::GetRandomNumber() & 0x1F) - 16) * 0.0035f + 1.0f;
+		*x += dir.x * directionMult;
+		*y += dir.y * directionMult;
+	}
+
+	return bWasWindModifierFound;
+}