395 lines
16 KiB
C#
395 lines
16 KiB
C#
using UnityEngine;
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using System.Collections;
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[ExecuteInEditMode] // Make water live-update even when not in play mode
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public class Water : MonoBehaviour
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{
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public enum WaterMode
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{
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Simple = 0,
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Reflective = 1,
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Refractive = 2,
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};
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public WaterMode m_WaterMode = WaterMode.Refractive;
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public bool m_DisablePixelLights = true;
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public int m_TextureSize = 256;
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public float m_ClipPlaneOffset = 0.07f;
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public LayerMask m_ReflectLayers = -1;
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public LayerMask m_RefractLayers = -1;
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private Hashtable m_ReflectionCameras = new Hashtable(); // Camera -> Camera table
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private Hashtable m_RefractionCameras = new Hashtable(); // Camera -> Camera table
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private RenderTexture m_ReflectionTexture = null;
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private RenderTexture m_RefractionTexture = null;
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private WaterMode m_HardwareWaterSupport = WaterMode.Refractive;
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private int m_OldReflectionTextureSize = 0;
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private int m_OldRefractionTextureSize = 0;
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private static bool s_InsideWater = false;
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// This is called when it's known that the object will be rendered by some
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// camera. We render reflections / refractions and do other updates here.
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// Because the script executes in edit mode, reflections for the scene view
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// camera will just work!
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public void OnWillRenderObject()
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{
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if (!enabled || !renderer || !renderer.sharedMaterial || !renderer.enabled)
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return;
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Camera cam = Camera.current;
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if (!cam)
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return;
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// Safeguard from recursive water reflections.
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if (s_InsideWater)
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return;
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s_InsideWater = true;
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// Actual water rendering mode depends on both the current setting AND
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// the hardware support. There's no point in rendering refraction textures
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// if they won't be visible in the end.
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m_HardwareWaterSupport = FindHardwareWaterSupport();
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WaterMode mode = GetWaterMode();
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Camera reflectionCamera, refractionCamera;
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CreateWaterObjects(cam, out reflectionCamera, out refractionCamera);
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// find out the reflection plane: position and normal in world space
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Vector3 pos = transform.position;
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Vector3 normal = transform.up;
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// Optionally disable pixel lights for reflection/refraction
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int oldPixelLightCount = QualitySettings.pixelLightCount;
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if (m_DisablePixelLights)
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QualitySettings.pixelLightCount = 0;
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UpdateCameraModes(cam, reflectionCamera);
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UpdateCameraModes(cam, refractionCamera);
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// Render reflection if needed
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if (mode >= WaterMode.Reflective)
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{
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// Reflect camera around reflection plane
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float d = -Vector3.Dot(normal, pos) - m_ClipPlaneOffset;
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Vector4 reflectionPlane = new Vector4(normal.x, normal.y, normal.z, d);
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Matrix4x4 reflection = Matrix4x4.zero;
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CalculateReflectionMatrix(ref reflection, reflectionPlane);
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Vector3 oldpos = cam.transform.position;
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Vector3 newpos = reflection.MultiplyPoint(oldpos);
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reflectionCamera.worldToCameraMatrix = cam.worldToCameraMatrix * reflection;
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// Setup oblique projection matrix so that near plane is our reflection
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// plane. This way we clip everything below/above it for free.
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Vector4 clipPlane = CameraSpacePlane(reflectionCamera, pos, normal, 1.0f);
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Matrix4x4 projection = cam.projectionMatrix;
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CalculateObliqueMatrix(ref projection, clipPlane);
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reflectionCamera.projectionMatrix = projection;
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reflectionCamera.cullingMask = ~(1 << 4) & m_ReflectLayers.value; // never render water layer
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reflectionCamera.targetTexture = m_ReflectionTexture;
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GL.SetRevertBackfacing(true);
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reflectionCamera.transform.position = newpos;
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Vector3 euler = cam.transform.eulerAngles;
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reflectionCamera.transform.eulerAngles = new Vector3(0, euler.y, euler.z);
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reflectionCamera.Render();
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reflectionCamera.transform.position = oldpos;
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GL.SetRevertBackfacing(false);
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renderer.sharedMaterial.SetTexture("_ReflectionTex", m_ReflectionTexture);
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}
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// Render refraction
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if (mode >= WaterMode.Refractive)
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{
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refractionCamera.worldToCameraMatrix = cam.worldToCameraMatrix;
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// Setup oblique projection matrix so that near plane is our reflection
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// plane. This way we clip everything below/above it for free.
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Vector4 clipPlane = CameraSpacePlane(refractionCamera, pos, normal, -1.0f);
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Matrix4x4 projection = cam.projectionMatrix;
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CalculateObliqueMatrix(ref projection, clipPlane);
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refractionCamera.projectionMatrix = projection;
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refractionCamera.cullingMask = ~(1 << 4) & m_RefractLayers.value; // never render water layer
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refractionCamera.targetTexture = m_RefractionTexture;
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refractionCamera.transform.position = cam.transform.position;
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refractionCamera.transform.rotation = cam.transform.rotation;
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refractionCamera.Render();
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renderer.sharedMaterial.SetTexture("_RefractionTex", m_RefractionTexture);
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}
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// Restore pixel light count
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if (m_DisablePixelLights)
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QualitySettings.pixelLightCount = oldPixelLightCount;
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// Setup shader keywords based on water mode
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switch (mode)
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{
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case WaterMode.Simple:
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Shader.EnableKeyword("WATER_SIMPLE");
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Shader.DisableKeyword("WATER_REFLECTIVE");
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Shader.DisableKeyword("WATER_REFRACTIVE");
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break;
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case WaterMode.Reflective:
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Shader.DisableKeyword("WATER_SIMPLE");
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Shader.EnableKeyword("WATER_REFLECTIVE");
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Shader.DisableKeyword("WATER_REFRACTIVE");
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break;
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case WaterMode.Refractive:
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Shader.DisableKeyword("WATER_SIMPLE");
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Shader.DisableKeyword("WATER_REFLECTIVE");
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Shader.EnableKeyword("WATER_REFRACTIVE");
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break;
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}
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s_InsideWater = false;
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}
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// Cleanup all the objects we possibly have created
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void OnDisable()
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{
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if (m_ReflectionTexture)
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{
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DestroyImmediate(m_ReflectionTexture);
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m_ReflectionTexture = null;
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}
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if (m_RefractionTexture)
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{
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DestroyImmediate(m_RefractionTexture);
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m_RefractionTexture = null;
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}
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foreach (DictionaryEntry kvp in m_ReflectionCameras)
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DestroyImmediate(((Camera)kvp.Value).gameObject);
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m_ReflectionCameras.Clear();
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foreach (DictionaryEntry kvp in m_RefractionCameras)
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DestroyImmediate(((Camera)kvp.Value).gameObject);
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m_RefractionCameras.Clear();
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}
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// This just sets up some matrices in the material; for really
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// old cards to make water texture scroll.
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void Update()
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{
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if (!renderer)
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return;
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Material mat = renderer.sharedMaterial;
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if (!mat)
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return;
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Vector4 waveSpeed = mat.GetVector("WaveSpeed");
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float waveScale = mat.GetFloat("_WaveScale");
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Vector4 waveScale4 = new Vector4(waveScale, waveScale, waveScale * 0.4f, waveScale * 0.45f);
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// Time since level load, and do intermediate calculations with doubles
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double t = Time.timeSinceLevelLoad / 20.0;
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Vector4 offsetClamped = new Vector4(
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(float)System.Math.IEEERemainder(waveSpeed.x * waveScale4.x * t, 1.0),
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(float)System.Math.IEEERemainder(waveSpeed.y * waveScale4.y * t, 1.0),
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(float)System.Math.IEEERemainder(waveSpeed.z * waveScale4.z * t, 1.0),
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(float)System.Math.IEEERemainder(waveSpeed.w * waveScale4.w * t, 1.0)
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);
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mat.SetVector("_WaveOffset", offsetClamped);
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mat.SetVector("_WaveScale4", waveScale4);
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Vector3 waterSize = renderer.bounds.size;
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Vector3 scale = new Vector3(waterSize.x * waveScale4.x, waterSize.z * waveScale4.y, 1);
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Matrix4x4 scrollMatrix = Matrix4x4.TRS(new Vector3(offsetClamped.x, offsetClamped.y, 0), Quaternion.identity, scale);
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mat.SetMatrix("_WaveMatrix", scrollMatrix);
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scale = new Vector3(waterSize.x * waveScale4.z, waterSize.z * waveScale4.w, 1);
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scrollMatrix = Matrix4x4.TRS(new Vector3(offsetClamped.z, offsetClamped.w, 0), Quaternion.identity, scale);
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mat.SetMatrix("_WaveMatrix2", scrollMatrix);
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}
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private void UpdateCameraModes(Camera src, Camera dest)
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{
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if (dest == null)
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return;
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// set water camera to clear the same way as current camera
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dest.clearFlags = src.clearFlags;
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dest.backgroundColor = src.backgroundColor;
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if (src.clearFlags == CameraClearFlags.Skybox)
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{
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Skybox sky = src.GetComponent(typeof(Skybox)) as Skybox;
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Skybox mysky = dest.GetComponent(typeof(Skybox)) as Skybox;
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if (!sky || !sky.material)
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{
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mysky.enabled = false;
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}
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else
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{
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mysky.enabled = true;
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mysky.material = sky.material;
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}
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}
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// update other values to match current camera.
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// even if we are supplying custom camera&projection matrices,
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// some of values are used elsewhere (e.g. skybox uses far plane)
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dest.farClipPlane = src.farClipPlane;
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dest.nearClipPlane = src.nearClipPlane;
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dest.orthographic = src.orthographic;
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dest.fieldOfView = src.fieldOfView;
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dest.aspect = src.aspect;
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dest.orthographicSize = src.orthographicSize;
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}
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// On-demand create any objects we need for water
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private void CreateWaterObjects(Camera currentCamera, out Camera reflectionCamera, out Camera refractionCamera)
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{
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WaterMode mode = GetWaterMode();
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reflectionCamera = null;
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refractionCamera = null;
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if (mode >= WaterMode.Reflective)
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{
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// Reflection render texture
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if (!m_ReflectionTexture || m_OldReflectionTextureSize != m_TextureSize)
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{
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if (m_ReflectionTexture)
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DestroyImmediate(m_ReflectionTexture);
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m_ReflectionTexture = new RenderTexture(m_TextureSize, m_TextureSize, 16);
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m_ReflectionTexture.name = "__WaterReflection" + GetInstanceID();
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m_ReflectionTexture.isPowerOfTwo = true;
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m_ReflectionTexture.hideFlags = HideFlags.DontSave;
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m_OldReflectionTextureSize = m_TextureSize;
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}
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// Camera for reflection
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reflectionCamera = m_ReflectionCameras[currentCamera] as Camera;
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if (!reflectionCamera) // catch both not-in-dictionary and in-dictionary-but-deleted-GO
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{
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GameObject go = new GameObject("Water Refl Camera id" + GetInstanceID() + " for " + currentCamera.GetInstanceID(), typeof(Camera), typeof(Skybox));
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reflectionCamera = go.camera;
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reflectionCamera.enabled = false;
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reflectionCamera.transform.position = transform.position;
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reflectionCamera.transform.rotation = transform.rotation;
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reflectionCamera.gameObject.AddComponent("FlareLayer");
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go.hideFlags = HideFlags.HideAndDontSave;
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m_ReflectionCameras[currentCamera] = reflectionCamera;
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}
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}
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if (mode >= WaterMode.Refractive)
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{
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// Refraction render texture
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if (!m_RefractionTexture || m_OldRefractionTextureSize != m_TextureSize)
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{
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if (m_RefractionTexture)
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DestroyImmediate(m_RefractionTexture);
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m_RefractionTexture = new RenderTexture(m_TextureSize, m_TextureSize, 16);
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m_RefractionTexture.name = "__WaterRefraction" + GetInstanceID();
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m_RefractionTexture.isPowerOfTwo = true;
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m_RefractionTexture.hideFlags = HideFlags.DontSave;
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m_OldRefractionTextureSize = m_TextureSize;
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}
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// Camera for refraction
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refractionCamera = m_RefractionCameras[currentCamera] as Camera;
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if (!refractionCamera) // catch both not-in-dictionary and in-dictionary-but-deleted-GO
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{
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GameObject go = new GameObject("Water Refr Camera id" + GetInstanceID() + " for " + currentCamera.GetInstanceID(), typeof(Camera), typeof(Skybox));
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refractionCamera = go.camera;
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refractionCamera.enabled = false;
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refractionCamera.transform.position = transform.position;
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refractionCamera.transform.rotation = transform.rotation;
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refractionCamera.gameObject.AddComponent("FlareLayer");
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go.hideFlags = HideFlags.HideAndDontSave;
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m_RefractionCameras[currentCamera] = refractionCamera;
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}
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}
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}
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private WaterMode GetWaterMode()
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{
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if (m_HardwareWaterSupport < m_WaterMode)
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return m_HardwareWaterSupport;
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else
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return m_WaterMode;
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}
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private WaterMode FindHardwareWaterSupport()
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{
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if (!SystemInfo.supportsRenderTextures || !renderer)
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return WaterMode.Simple;
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Material mat = renderer.sharedMaterial;
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if (!mat)
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return WaterMode.Simple;
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string mode = mat.GetTag("WATERMODE", false);
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if (mode == "Refractive")
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return WaterMode.Refractive;
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if (mode == "Reflective")
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return WaterMode.Reflective;
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return WaterMode.Simple;
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}
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// Extended sign: returns -1, 0 or 1 based on sign of a
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private static float sgn(float a)
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{
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if (a > 0.0f) return 1.0f;
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if (a < 0.0f) return -1.0f;
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return 0.0f;
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}
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// Given position/normal of the plane, calculates plane in camera space.
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private Vector4 CameraSpacePlane(Camera cam, Vector3 pos, Vector3 normal, float sideSign)
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{
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Vector3 offsetPos = pos + normal * m_ClipPlaneOffset;
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Matrix4x4 m = cam.worldToCameraMatrix;
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Vector3 cpos = m.MultiplyPoint(offsetPos);
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Vector3 cnormal = m.MultiplyVector(normal).normalized * sideSign;
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return new Vector4(cnormal.x, cnormal.y, cnormal.z, -Vector3.Dot(cpos, cnormal));
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}
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// Adjusts the given projection matrix so that near plane is the given clipPlane
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// clipPlane is given in camera space. See article in Game Programming Gems 5 and
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// http://aras-p.info/texts/obliqueortho.html
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private static void CalculateObliqueMatrix(ref Matrix4x4 projection, Vector4 clipPlane)
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{
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Vector4 q = projection.inverse * new Vector4(
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sgn(clipPlane.x),
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sgn(clipPlane.y),
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1.0f,
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1.0f
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);
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Vector4 c = clipPlane * (2.0F / (Vector4.Dot(clipPlane, q)));
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// third row = clip plane - fourth row
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projection[2] = c.x - projection[3];
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projection[6] = c.y - projection[7];
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projection[10] = c.z - projection[11];
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projection[14] = c.w - projection[15];
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}
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// Calculates reflection matrix around the given plane
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private static void CalculateReflectionMatrix(ref Matrix4x4 reflectionMat, Vector4 plane)
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{
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reflectionMat.m00 = (1F - 2F * plane[0] * plane[0]);
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reflectionMat.m01 = (-2F * plane[0] * plane[1]);
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reflectionMat.m02 = (-2F * plane[0] * plane[2]);
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reflectionMat.m03 = (-2F * plane[3] * plane[0]);
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reflectionMat.m10 = (-2F * plane[1] * plane[0]);
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reflectionMat.m11 = (1F - 2F * plane[1] * plane[1]);
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reflectionMat.m12 = (-2F * plane[1] * plane[2]);
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reflectionMat.m13 = (-2F * plane[3] * plane[1]);
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reflectionMat.m20 = (-2F * plane[2] * plane[0]);
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reflectionMat.m21 = (-2F * plane[2] * plane[1]);
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reflectionMat.m22 = (1F - 2F * plane[2] * plane[2]);
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reflectionMat.m23 = (-2F * plane[3] * plane[2]);
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reflectionMat.m30 = 0F;
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reflectionMat.m31 = 0F;
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reflectionMat.m32 = 0F;
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reflectionMat.m33 = 1F;
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}
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} |