using System;
|
using System.Collections.Generic;
|
using UnityEngine;
|
|
namespace UnityStandardAssets.Water
|
{
|
[ExecuteInEditMode] // Make water live-update even when not in play mode
|
public class Water : MonoBehaviour
|
{
|
public enum WaterMode
|
{
|
Simple = 0,
|
Reflective = 1,
|
Refractive = 2,
|
};
|
|
|
public WaterMode waterMode = WaterMode.Refractive;
|
public bool disablePixelLights = true;
|
public int textureSize = 256;
|
public float clipPlaneOffset = 0.07f;
|
public LayerMask reflectLayers = -1;
|
public LayerMask refractLayers = -1;
|
|
|
private Dictionary<Camera, Camera> m_ReflectionCameras = new Dictionary<Camera, Camera>(); // Camera -> Camera table
|
private Dictionary<Camera, Camera> m_RefractionCameras = new Dictionary<Camera, Camera>(); // Camera -> Camera table
|
private RenderTexture m_ReflectionTexture;
|
private RenderTexture m_RefractionTexture;
|
private WaterMode m_HardwareWaterSupport = WaterMode.Refractive;
|
private int m_OldReflectionTextureSize;
|
private int m_OldRefractionTextureSize;
|
private static bool s_InsideWater;
|
|
|
// This is called when it's known that the object will be rendered by some
|
// camera. We render reflections / refractions and do other updates here.
|
// Because the script executes in edit mode, reflections for the scene view
|
// camera will just work!
|
public void OnWillRenderObject()
|
{
|
if (!enabled || !GetComponent<Renderer>() || !GetComponent<Renderer>().sharedMaterial ||
|
!GetComponent<Renderer>().enabled)
|
{
|
return;
|
}
|
|
Camera cam = Camera.current;
|
if (!cam)
|
{
|
return;
|
}
|
|
// Safeguard from recursive water reflections.
|
if (s_InsideWater)
|
{
|
return;
|
}
|
s_InsideWater = true;
|
|
// Actual water rendering mode depends on both the current setting AND
|
// the hardware support. There's no point in rendering refraction textures
|
// if they won't be visible in the end.
|
m_HardwareWaterSupport = FindHardwareWaterSupport();
|
WaterMode mode = GetWaterMode();
|
|
Camera reflectionCamera, refractionCamera;
|
CreateWaterObjects(cam, out reflectionCamera, out refractionCamera);
|
|
// find out the reflection plane: position and normal in world space
|
Vector3 pos = transform.position;
|
Vector3 normal = transform.up;
|
|
// Optionally disable pixel lights for reflection/refraction
|
int oldPixelLightCount = QualitySettings.pixelLightCount;
|
if (disablePixelLights)
|
{
|
QualitySettings.pixelLightCount = 0;
|
}
|
|
UpdateCameraModes(cam, reflectionCamera);
|
UpdateCameraModes(cam, refractionCamera);
|
|
// Render reflection if needed
|
if (mode >= WaterMode.Reflective)
|
{
|
// Reflect camera around reflection plane
|
float d = -Vector3.Dot(normal, pos) - clipPlaneOffset;
|
Vector4 reflectionPlane = new Vector4(normal.x, normal.y, normal.z, d);
|
|
Matrix4x4 reflection = Matrix4x4.zero;
|
CalculateReflectionMatrix(ref reflection, reflectionPlane);
|
Vector3 oldpos = cam.transform.position;
|
Vector3 newpos = reflection.MultiplyPoint(oldpos);
|
reflectionCamera.worldToCameraMatrix = cam.worldToCameraMatrix * reflection;
|
|
// Setup oblique projection matrix so that near plane is our reflection
|
// plane. This way we clip everything below/above it for free.
|
Vector4 clipPlane = CameraSpacePlane(reflectionCamera, pos, normal, 1.0f);
|
reflectionCamera.projectionMatrix = cam.CalculateObliqueMatrix(clipPlane);
|
|
// Set custom culling matrix from the current camera
|
reflectionCamera.cullingMatrix = cam.projectionMatrix * cam.worldToCameraMatrix;
|
|
reflectionCamera.cullingMask = ~(1 << 4) & reflectLayers.value; // never render water layer
|
reflectionCamera.targetTexture = m_ReflectionTexture;
|
bool oldCulling = GL.invertCulling;
|
GL.invertCulling = !oldCulling;
|
reflectionCamera.transform.position = newpos;
|
Vector3 euler = cam.transform.eulerAngles;
|
reflectionCamera.transform.eulerAngles = new Vector3(-euler.x, euler.y, euler.z);
|
reflectionCamera.Render();
|
reflectionCamera.transform.position = oldpos;
|
GL.invertCulling = oldCulling;
|
GetComponent<Renderer>().sharedMaterial.SetTexture("_ReflectionTex", m_ReflectionTexture);
|
}
|
|
// Render refraction
|
if (mode >= WaterMode.Refractive)
|
{
|
refractionCamera.worldToCameraMatrix = cam.worldToCameraMatrix;
|
|
// Setup oblique projection matrix so that near plane is our reflection
|
// plane. This way we clip everything below/above it for free.
|
Vector4 clipPlane = CameraSpacePlane(refractionCamera, pos, normal, -1.0f);
|
refractionCamera.projectionMatrix = cam.CalculateObliqueMatrix(clipPlane);
|
|
// Set custom culling matrix from the current camera
|
refractionCamera.cullingMatrix = cam.projectionMatrix * cam.worldToCameraMatrix;
|
|
refractionCamera.cullingMask = ~(1 << 4) & refractLayers.value; // never render water layer
|
refractionCamera.targetTexture = m_RefractionTexture;
|
refractionCamera.transform.position = cam.transform.position;
|
refractionCamera.transform.rotation = cam.transform.rotation;
|
refractionCamera.Render();
|
GetComponent<Renderer>().sharedMaterial.SetTexture("_RefractionTex", m_RefractionTexture);
|
}
|
|
// Restore pixel light count
|
if (disablePixelLights)
|
{
|
QualitySettings.pixelLightCount = oldPixelLightCount;
|
}
|
|
// Setup shader keywords based on water mode
|
switch (mode)
|
{
|
case WaterMode.Simple:
|
Shader.EnableKeyword("WATER_SIMPLE");
|
Shader.DisableKeyword("WATER_REFLECTIVE");
|
Shader.DisableKeyword("WATER_REFRACTIVE");
|
break;
|
case WaterMode.Reflective:
|
Shader.DisableKeyword("WATER_SIMPLE");
|
Shader.EnableKeyword("WATER_REFLECTIVE");
|
Shader.DisableKeyword("WATER_REFRACTIVE");
|
break;
|
case WaterMode.Refractive:
|
Shader.DisableKeyword("WATER_SIMPLE");
|
Shader.DisableKeyword("WATER_REFLECTIVE");
|
Shader.EnableKeyword("WATER_REFRACTIVE");
|
break;
|
}
|
|
s_InsideWater = false;
|
}
|
|
|
// Cleanup all the objects we possibly have created
|
void OnDisable()
|
{
|
if (m_ReflectionTexture)
|
{
|
DestroyImmediate(m_ReflectionTexture);
|
m_ReflectionTexture = null;
|
}
|
if (m_RefractionTexture)
|
{
|
DestroyImmediate(m_RefractionTexture);
|
m_RefractionTexture = null;
|
}
|
foreach (var kvp in m_ReflectionCameras)
|
{
|
DestroyImmediate((kvp.Value).gameObject);
|
}
|
m_ReflectionCameras.Clear();
|
foreach (var kvp in m_RefractionCameras)
|
{
|
DestroyImmediate((kvp.Value).gameObject);
|
}
|
m_RefractionCameras.Clear();
|
}
|
|
|
// This just sets up some matrices in the material; for really
|
// old cards to make water texture scroll.
|
void Update()
|
{
|
if (!GetComponent<Renderer>())
|
{
|
return;
|
}
|
Material mat = GetComponent<Renderer>().sharedMaterial;
|
if (!mat)
|
{
|
return;
|
}
|
|
Vector4 waveSpeed = mat.GetVector("WaveSpeed");
|
float waveScale = mat.GetFloat("_WaveScale");
|
Vector4 waveScale4 = new Vector4(waveScale, waveScale, waveScale * 0.4f, waveScale * 0.45f);
|
|
// Time since level load, and do intermediate calculations with doubles
|
double t = Time.timeSinceLevelLoad / 20.0;
|
Vector4 offsetClamped = new Vector4(
|
(float)Math.IEEERemainder(waveSpeed.x * waveScale4.x * t, 1.0),
|
(float)Math.IEEERemainder(waveSpeed.y * waveScale4.y * t, 1.0),
|
(float)Math.IEEERemainder(waveSpeed.z * waveScale4.z * t, 1.0),
|
(float)Math.IEEERemainder(waveSpeed.w * waveScale4.w * t, 1.0)
|
);
|
|
mat.SetVector("_WaveOffset", offsetClamped);
|
mat.SetVector("_WaveScale4", waveScale4);
|
}
|
|
void UpdateCameraModes(Camera src, Camera dest)
|
{
|
if (dest == null)
|
{
|
return;
|
}
|
// set water camera to clear the same way as current camera
|
dest.clearFlags = src.clearFlags;
|
dest.backgroundColor = src.backgroundColor;
|
if (src.clearFlags == CameraClearFlags.Skybox)
|
{
|
Skybox sky = src.GetComponent<Skybox>();
|
Skybox mysky = dest.GetComponent<Skybox>();
|
if (!sky || !sky.material)
|
{
|
mysky.enabled = false;
|
}
|
else
|
{
|
mysky.enabled = true;
|
mysky.material = sky.material;
|
}
|
}
|
// update other values to match current camera.
|
// even if we are supplying custom camera&projection matrices,
|
// some of values are used elsewhere (e.g. skybox uses far plane)
|
dest.farClipPlane = src.farClipPlane;
|
dest.nearClipPlane = src.nearClipPlane;
|
dest.orthographic = src.orthographic;
|
dest.fieldOfView = src.fieldOfView;
|
dest.aspect = src.aspect;
|
dest.orthographicSize = src.orthographicSize;
|
}
|
|
|
// On-demand create any objects we need for water
|
void CreateWaterObjects(Camera currentCamera, out Camera reflectionCamera, out Camera refractionCamera)
|
{
|
WaterMode mode = GetWaterMode();
|
|
reflectionCamera = null;
|
refractionCamera = null;
|
|
if (mode >= WaterMode.Reflective)
|
{
|
// Reflection render texture
|
if (!m_ReflectionTexture || m_OldReflectionTextureSize != textureSize)
|
{
|
if (m_ReflectionTexture)
|
{
|
DestroyImmediate(m_ReflectionTexture);
|
}
|
m_ReflectionTexture = new RenderTexture(textureSize, textureSize, 16);
|
m_ReflectionTexture.name = "__WaterReflection" + GetInstanceID();
|
m_ReflectionTexture.isPowerOfTwo = true;
|
m_ReflectionTexture.hideFlags = HideFlags.DontSave;
|
m_OldReflectionTextureSize = textureSize;
|
}
|
|
// Camera for reflection
|
m_ReflectionCameras.TryGetValue(currentCamera, out reflectionCamera);
|
if (!reflectionCamera) // catch both not-in-dictionary and in-dictionary-but-deleted-GO
|
{
|
GameObject go = new GameObject("Water Refl Camera id" + GetInstanceID() + " for " + currentCamera.GetInstanceID(), typeof(Camera), typeof(Skybox));
|
reflectionCamera = go.GetComponent<Camera>();
|
reflectionCamera.enabled = false;
|
reflectionCamera.transform.position = transform.position;
|
reflectionCamera.transform.rotation = transform.rotation;
|
reflectionCamera.gameObject.AddComponent<FlareLayer>();
|
go.hideFlags = HideFlags.HideAndDontSave;
|
m_ReflectionCameras[currentCamera] = reflectionCamera;
|
}
|
}
|
|
if (mode >= WaterMode.Refractive)
|
{
|
// Refraction render texture
|
if (!m_RefractionTexture || m_OldRefractionTextureSize != textureSize)
|
{
|
if (m_RefractionTexture)
|
{
|
DestroyImmediate(m_RefractionTexture);
|
}
|
m_RefractionTexture = new RenderTexture(textureSize, textureSize, 16);
|
m_RefractionTexture.name = "__WaterRefraction" + GetInstanceID();
|
m_RefractionTexture.isPowerOfTwo = true;
|
m_RefractionTexture.hideFlags = HideFlags.DontSave;
|
m_OldRefractionTextureSize = textureSize;
|
}
|
|
// Camera for refraction
|
m_RefractionCameras.TryGetValue(currentCamera, out refractionCamera);
|
if (!refractionCamera) // catch both not-in-dictionary and in-dictionary-but-deleted-GO
|
{
|
GameObject go =
|
new GameObject("Water Refr Camera id" + GetInstanceID() + " for " + currentCamera.GetInstanceID(),
|
typeof(Camera), typeof(Skybox));
|
refractionCamera = go.GetComponent<Camera>();
|
refractionCamera.enabled = false;
|
refractionCamera.transform.position = transform.position;
|
refractionCamera.transform.rotation = transform.rotation;
|
refractionCamera.gameObject.AddComponent<FlareLayer>();
|
go.hideFlags = HideFlags.HideAndDontSave;
|
m_RefractionCameras[currentCamera] = refractionCamera;
|
}
|
}
|
}
|
|
WaterMode GetWaterMode()
|
{
|
if (m_HardwareWaterSupport < waterMode)
|
{
|
return m_HardwareWaterSupport;
|
}
|
return waterMode;
|
}
|
|
WaterMode FindHardwareWaterSupport()
|
{
|
if (!GetComponent<Renderer>())
|
{
|
return WaterMode.Simple;
|
}
|
|
Material mat = GetComponent<Renderer>().sharedMaterial;
|
if (!mat)
|
{
|
return WaterMode.Simple;
|
}
|
|
string mode = mat.GetTag("WATERMODE", false);
|
if (mode == "Refractive")
|
{
|
return WaterMode.Refractive;
|
}
|
if (mode == "Reflective")
|
{
|
return WaterMode.Reflective;
|
}
|
|
return WaterMode.Simple;
|
}
|
|
// Given position/normal of the plane, calculates plane in camera space.
|
Vector4 CameraSpacePlane(Camera cam, Vector3 pos, Vector3 normal, float sideSign)
|
{
|
Vector3 offsetPos = pos + normal * clipPlaneOffset;
|
Matrix4x4 m = cam.worldToCameraMatrix;
|
Vector3 cpos = m.MultiplyPoint(offsetPos);
|
Vector3 cnormal = m.MultiplyVector(normal).normalized * sideSign;
|
return new Vector4(cnormal.x, cnormal.y, cnormal.z, -Vector3.Dot(cpos, cnormal));
|
}
|
|
// Calculates reflection matrix around the given plane
|
static void CalculateReflectionMatrix(ref Matrix4x4 reflectionMat, Vector4 plane)
|
{
|
reflectionMat.m00 = (1F - 2F * plane[0] * plane[0]);
|
reflectionMat.m01 = (- 2F * plane[0] * plane[1]);
|
reflectionMat.m02 = (- 2F * plane[0] * plane[2]);
|
reflectionMat.m03 = (- 2F * plane[3] * plane[0]);
|
|
reflectionMat.m10 = (- 2F * plane[1] * plane[0]);
|
reflectionMat.m11 = (1F - 2F * plane[1] * plane[1]);
|
reflectionMat.m12 = (- 2F * plane[1] * plane[2]);
|
reflectionMat.m13 = (- 2F * plane[3] * plane[1]);
|
|
reflectionMat.m20 = (- 2F * plane[2] * plane[0]);
|
reflectionMat.m21 = (- 2F * plane[2] * plane[1]);
|
reflectionMat.m22 = (1F - 2F * plane[2] * plane[2]);
|
reflectionMat.m23 = (- 2F * plane[3] * plane[2]);
|
|
reflectionMat.m30 = 0F;
|
reflectionMat.m31 = 0F;
|
reflectionMat.m32 = 0F;
|
reflectionMat.m33 = 1F;
|
}
|
}
|
}
|
