water ripples (experimental)
scrawl
12 years ago
parent
3ec703e6af
commit
a461b282c1
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#include "ripplesimulation.hpp"
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#include <OgreTextureManager.h>
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#include <OgreStringConverter.h>
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#include <OgreHardwarePixelBuffer.h>
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#include <OgreRoot.h>
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#include <extern/shiny/Main/Factory.hpp>
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namespace MWRender
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{
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RippleSimulation::RippleSimulation(Ogre::SceneManager* mainSceneManager)
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: mMainSceneMgr(mainSceneManager),
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mTime(0),
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mCurrentFrameOffset(0,0),
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mPreviousFrameOffset(0,0),
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mRippleCenter(0,0),
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mTextureSize(512),
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mRippleAreaLength(1000),
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mImpulseSize(20),
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mTexelOffset(0,0)
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{
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Ogre::AxisAlignedBox aabInf;
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aabInf.setInfinite();
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mHeightToNormalMapMaterial = Ogre::MaterialManager::getSingleton().getByName("HeightToNormalMap");
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mHeightmapMaterial = Ogre::MaterialManager::getSingleton().getByName("HeightmapSimulation");
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mSceneMgr = Ogre::Root::getSingleton().createSceneManager(Ogre::ST_GENERIC);
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mCamera = mSceneMgr->createCamera("RippleCamera");
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mRectangle = new Ogre::Rectangle2D(true);
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mRectangle->setBoundingBox(aabInf);
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mRectangle->setCorners(-1.0, 1.0, 1.0, -1.0, false);
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Ogre::SceneNode* node = mSceneMgr->getRootSceneNode()->createChildSceneNode();
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node->attachObject(mRectangle);
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mImpulse = new Ogre::Rectangle2D(true);
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mImpulse->setCorners(-0.1, 0.1, 0.1, -0.1, false);
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mImpulse->setBoundingBox(aabInf);
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mImpulse->setMaterial("AddImpulse");
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Ogre::SceneNode* impulseNode = mSceneMgr->getRootSceneNode()->createChildSceneNode();
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impulseNode->attachObject(mImpulse);
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float w=0.05;
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for (int i=0; i<4; ++i)
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{
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Ogre::TexturePtr texture;
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if (i != 3)
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texture = Ogre::TextureManager::getSingleton().createManual("RippleHeight" + Ogre::StringConverter::toString(i),
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Ogre::ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME, Ogre::TEX_TYPE_2D, mTextureSize, mTextureSize, 1, 0, Ogre::PF_R8G8B8, Ogre::TU_RENDERTARGET);
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else
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texture = Ogre::TextureManager::getSingleton().createManual("RippleNormal",
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Ogre::ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME, Ogre::TEX_TYPE_2D, mTextureSize, mTextureSize, 1, 0, Ogre::PF_R8G8B8, Ogre::TU_RENDERTARGET);
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Ogre::RenderTexture* rt = texture->getBuffer()->getRenderTarget();
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rt->removeAllViewports();
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rt->addViewport(mCamera);
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rt->setAutoUpdated(false);
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rt->getViewport(0)->setClearEveryFrame(false);
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// debug overlay
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Ogre::Rectangle2D* debugOverlay = new Ogre::Rectangle2D(true);
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debugOverlay->setCorners(w*2-1, 0.9, (w+0.18)*2-1, 0.4, false);
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w += 0.2;
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debugOverlay->setBoundingBox(aabInf);
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Ogre::SceneNode* debugNode = mMainSceneMgr->getRootSceneNode()->createChildSceneNode();
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debugNode->attachObject(debugOverlay);
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Ogre::MaterialPtr debugMaterial = Ogre::MaterialManager::getSingleton().create("RippleDebug" + Ogre::StringConverter::toString(i),
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Ogre::ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME);
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if (i != 3)
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debugMaterial->getTechnique(0)->getPass(0)->createTextureUnitState("RippleHeight" + Ogre::StringConverter::toString(i));
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else
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debugMaterial->getTechnique(0)->getPass(0)->createTextureUnitState("RippleNormal");
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debugMaterial->getTechnique(0)->getPass(0)->setLightingEnabled(false);
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debugOverlay->setMaterial("RippleDebug" + Ogre::StringConverter::toString(i));
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mRenderTargets[i] = rt;
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mTextures[i] = texture;
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}
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sh::Factory::getInstance().setSharedParameter("rippleTextureSize", sh::makeProperty<sh::Vector4>(
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new sh::Vector4(1.0/512, 1.0/512, 512, 512)));
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sh::Factory::getInstance().setSharedParameter("rippleCenter", sh::makeProperty<sh::Vector3>(
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new sh::Vector3(0, 0, 0)));
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sh::Factory::getInstance().setSharedParameter("rippleAreaLength", sh::makeProperty<sh::FloatValue>(
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new sh::FloatValue(mRippleAreaLength)));
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}
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RippleSimulation::~RippleSimulation()
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{
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delete mRectangle;
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Ogre::Root::getSingleton().destroySceneManager(mSceneMgr);
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}
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void RippleSimulation::update(float dt, Ogre::Vector2 position)
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{
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// try to keep 20 fps
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mTime += dt;
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while (mTime >= 1/20.0)
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{
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mPreviousFrameOffset = mCurrentFrameOffset;
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mCurrentFrameOffset = position - mRippleCenter;
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// add texel offsets from previous frame.
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mCurrentFrameOffset += mTexelOffset;
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mTexelOffset = Ogre::Vector2(std::fmod(mCurrentFrameOffset.x, 1.0f/mTextureSize),
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std::fmod(mCurrentFrameOffset.y, 1.0f/mTextureSize));
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// now subtract new offset in order to snap to texels
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mCurrentFrameOffset -= mTexelOffset;
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// texture coordinate space
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mCurrentFrameOffset /= mRippleAreaLength;
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std::cout << "Offset " << mCurrentFrameOffset << std::endl;
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mRippleCenter = position;
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addImpulses();
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waterSimulation();
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heightMapToNormalMap();
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swapHeightMaps();
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mTime -= 1/20.0;
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}
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sh::Factory::getInstance().setSharedParameter("rippleCenter", sh::makeProperty<sh::Vector3>(
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new sh::Vector3(mRippleCenter.x + mTexelOffset.x, mRippleCenter.y + mTexelOffset.y, 0)));
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}
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void RippleSimulation::addImpulse(Ogre::Vector2 position)
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{
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mImpulses.push(position);
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}
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void RippleSimulation::addImpulses()
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{
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mRectangle->setVisible(false);
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mImpulse->setVisible(true);
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while (mImpulses.size())
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{
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Ogre::Vector2 pos = mImpulses.front();
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pos -= mRippleCenter;
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pos /= mRippleAreaLength;
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float size = mImpulseSize / mRippleAreaLength;
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mImpulse->setCorners(pos.x-size, pos.y+size, pos.x+size, pos.y-size, false);
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mImpulses.pop();
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mRenderTargets[1]->update();
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}
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mImpulse->setVisible(false);
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mRectangle->setVisible(true);
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}
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void RippleSimulation::waterSimulation()
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{
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mRectangle->setMaterial("HeightmapSimulation");
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sh::Factory::getInstance().setTextureAlias("Heightmap0", mTextures[0]->getName());
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sh::Factory::getInstance().setTextureAlias("Heightmap1", mTextures[1]->getName());
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sh::Factory::getInstance().setSharedParameter("currentFrameOffset", sh::makeProperty<sh::Vector3>(
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new sh::Vector3(mCurrentFrameOffset.x, mCurrentFrameOffset.y, 0)));
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sh::Factory::getInstance().setSharedParameter("previousFrameOffset", sh::makeProperty<sh::Vector3>(
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new sh::Vector3(mPreviousFrameOffset.x, mPreviousFrameOffset.y, 0)));
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mRenderTargets[2]->update();
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}
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void RippleSimulation::heightMapToNormalMap()
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{
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mRectangle->setMaterial("HeightToNormalMap");
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sh::Factory::getInstance().setTextureAlias("Heightmap2", mTextures[2]->getName());
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mRenderTargets[TEX_NORMAL]->update();
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}
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void RippleSimulation::swapHeightMaps()
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{
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// 0 -> 1 -> 2 to 2 -> 0 ->1
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Ogre::RenderTexture* tmp = mRenderTargets[0];
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Ogre::TexturePtr tmp2 = mTextures[0];
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mRenderTargets[0] = mRenderTargets[1];
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mTextures[0] = mTextures[1];
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mRenderTargets[1] = mRenderTargets[2];
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mTextures[1] = mTextures[2];
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mRenderTargets[2] = tmp;
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mTextures[2] = tmp2;
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}
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}
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@ -0,0 +1,72 @@
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#ifndef RIPPLE_SIMULATION_H
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#define RIPPLE_SIMULATION_H
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#include <OgreTexture.h>
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#include <OgreMaterial.h>
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#include <OgreVector2.h>
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namespace Ogre
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{
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class RenderTexture;
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class Camera;
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class SceneManager;
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class Rectangle2D;
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}
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namespace MWRender
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{
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class RippleSimulation
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{
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public:
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RippleSimulation(Ogre::SceneManager* mainSceneManager);
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~RippleSimulation();
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void update(float dt, Ogre::Vector2 position);
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void addImpulse (Ogre::Vector2 position);
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private:
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Ogre::RenderTexture* mRenderTargets[4];
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Ogre::TexturePtr mTextures[4];
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int mTextureSize;
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float mRippleAreaLength;
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float mImpulseSize;
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Ogre::Camera* mCamera;
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// own scenemanager to render our simulation
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Ogre::SceneManager* mSceneMgr;
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Ogre::Rectangle2D* mRectangle;
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// scenemanager to create the debug overlays on
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Ogre::SceneManager* mMainSceneMgr;
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Ogre::MaterialPtr mHeightmapMaterial;
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Ogre::MaterialPtr mHeightToNormalMapMaterial;
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static const int TEX_NORMAL = 3;
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Ogre::Rectangle2D* mImpulse;
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std::queue <Ogre::Vector2> mImpulses;
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void addImpulses();
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void heightMapToNormalMap();
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void waterSimulation();
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void swapHeightMaps();
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float mTime;
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Ogre::Vector2 mRippleCenter;
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Ogre::Vector2 mTexelOffset;
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Ogre::Vector2 mCurrentFrameOffset;
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Ogre::Vector2 mPreviousFrameOffset;
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};
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}
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#endif
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@ -0,0 +1,59 @@
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material HeightmapSimulation
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{
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allow_fixed_function false
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pass
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{
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depth_check off
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depth_write off
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vertex_program transform_vertex
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fragment_program watersim_fragment
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texture_unit heightPrevSampler
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{
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tex_address_mode border
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tex_border_colour 0 0 0
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texture_alias Heightmap0
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}
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texture_unit heightCurrentSampler
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{
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tex_address_mode border
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tex_border_colour 0 0 0
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texture_alias Heightmap1
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}
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}
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}
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material HeightToNormalMap
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{
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allow_fixed_function false
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pass
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{
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depth_check off
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depth_write off
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vertex_program transform_vertex
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fragment_program height_to_normal_fragment
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texture_unit heightCurrentSampler
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{
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texture_alias Heightmap2
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}
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}
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}
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material AddImpulse
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{
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allow_fixed_function false
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pass
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{
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depth_check off
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depth_write off
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scene_blend alpha_blend
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vertex_program transform_vertex
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fragment_program add_impulse_fragment
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texture_unit alphaMap
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{
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texture circle.png
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}
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}
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}
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@ -0,0 +1,31 @@
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shader_set transform_vertex
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{
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source quad.shader
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type vertex
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profiles_cg vs_2_0 vp40 arbvp1
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profiles_hlsl vs_2_0
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}
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shader_set watersim_fragment
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{
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source watersim_heightmap.shader
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type fragment
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profiles_cg ps_3_0 ps_2_x ps_2_0 fp40 arbfp1
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profiles_hlsl ps_3_0 ps_2_0
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}
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shader_set height_to_normal_fragment
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{
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source watersim_heighttonormal.shader
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type fragment
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profiles_cg ps_3_0 ps_2_x ps_2_0 fp40 arbfp1
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profiles_hlsl ps_3_0 ps_2_0
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}
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shader_set add_impulse_fragment
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{
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source watersim_addimpulse.shader
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type fragment
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profiles_cg ps_3_0 ps_2_x ps_2_0 fp40 arbfp1
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profiles_hlsl ps_3_0 ps_2_0
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}
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@ -0,0 +1,12 @@
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#include "core.h"
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#include "watersim_common.h"
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SH_BEGIN_PROGRAM
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shInput(float2, UV)
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shSampler2D(alphaMap)
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SH_START_PROGRAM
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{
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shOutputColour(0) = EncodeHeightmap(1.0);
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shOutputColour(0).a = shSample (alphaMap, UV.xy).a;
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}
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float DecodeHeightmap(float4 heightmap)
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{
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float4 table = float4(1.0, -1.0, 0.0, 0.0);
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return dot(heightmap, table);
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}
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float DecodeHeightmap(shTexture2D HeightmapSampler, float2 texcoord)
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{
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float4 heightmap = shSample(HeightmapSampler, texcoord);
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return DecodeHeightmap(heightmap);
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}
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float4 EncodeHeightmap(float fHeight)
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{
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float h = fHeight;
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float positive = fHeight > 0.0 ? fHeight : 0.0;
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float negative = fHeight < 0.0 ? -fHeight : 0.0;
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float4 color = float4(0,0,0,0);
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color.r = positive;
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color.g = negative;
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return color;
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}
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@ -0,0 +1,42 @@
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#include "core.h"
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#define DAMPING 0.92
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#include "watersim_common.h"
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SH_BEGIN_PROGRAM
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shInput(float2, UV)
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shSampler2D(heightPrevSampler)
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shSampler2D(heightCurrentSampler)
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shUniform(float3, previousFrameOffset) @shSharedParameter(previousFrameOffset, previousFrameOffset)
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shUniform(float3, currentFrameOffset) @shSharedParameter(currentFrameOffset, currentFrameOffset)
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shUniform(float4, rippleTextureSize) @shSharedParameter(rippleTextureSize, rippleTextureSize)
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SH_START_PROGRAM
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{
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const float3 offset[4] = float3[4](
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float3(-1.0, 0.0, 0.25),
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float3( 1.0, 0.0, 0.25),
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float3( 0.0,-1.0, 0.25),
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float3( 0.0, 1.0, 0.25)
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);
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float fHeightPrev = DecodeHeightmap(heightPrevSampler, UV.xy + previousFrameOffset.xy + currentFrameOffset.xy);
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float fNeighCurrent = 0;
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for ( int i=0; i<4; i++ )
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{
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float2 vTexcoord = UV + currentFrameOffset.xy + offset[i].xy * rippleTextureSize.xy;
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fNeighCurrent += (DecodeHeightmap(heightCurrentSampler, vTexcoord) * offset[i].z);
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}
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float fHeight = fNeighCurrent * 2.0 - fHeightPrev;
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fHeight *= DAMPING;
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shOutputColour(0) = EncodeHeightmap(fHeight);
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}
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#include "core.h"
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#include "watersim_common.h"
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SH_BEGIN_PROGRAM
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shInput(float2, UV)
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shSampler2D(heightCurrentSampler)
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shUniform(float4, rippleTextureSize) @shSharedParameter(rippleTextureSize, rippleTextureSize)
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SH_START_PROGRAM
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{
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float2 offset[4] = float2[4] (
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vec2(-1.0, 0.0),
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vec2( 1.0, 0.0),
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vec2( 0.0,-1.0),
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vec2( 0.0, 1.0)
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);
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float fHeightL = DecodeHeightmap(heightCurrentSampler, UV.xy + offset[0]*rippleTextureSize.xy);
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float fHeightR = DecodeHeightmap(heightCurrentSampler, UV.xy + offset[1]*rippleTextureSize.xy);
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float fHeightT = DecodeHeightmap(heightCurrentSampler, UV.xy + offset[2]*rippleTextureSize.xy);
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float fHeightB = DecodeHeightmap(heightCurrentSampler, UV.xy + offset[3]*rippleTextureSize.xy);
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float3 n = float3(fHeightB - fHeightT, fHeightR - fHeightL, 1.0);
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float3 normal = (n + 1.0) * 0.5;
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shOutputColour(0) = float4(normal.rgb, 1.0);
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}
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