TinyRenderEngine------First Demo-优快云博客

本文链接：https://blog.youkuaiyun.com/maoxh/article/details/5424676

本文介绍了一个简单的渲染引擎的搭建过程，包括渲染状态和效果的创建、渲染上下文配置、材质设定、场景构建及实体加载等内容。

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Demo 做的事情很简单:

1. 创建render state 和 effect

2. 创建RenderContext

3. 创建Material

4. 创建场景, 设置照相机. 这里场景中只有一个SceneNode

5. 创建Entity, 设置它的RenderContext和Material, 并加载到场景中的SceneNode中

6. 绘制

代码如下:

int main() { Root root; //set render system RenderSystem& rendSys = root.getRenderSystem(); RenderTargetSharedPtr pRenderTarget = rendSys.createRenderWindow("TinyRenderEngine", 800, 600, false); BlendStateSharedPtr pBlendState = rendSys.createBlendState("DefaultBlendState"); DepthStencilStateSharedPtr pDepthStencilState = rendSys.createDepthStencilState("DefaultDepthStencilState"); RasterizerStateSharedPtr pRasterizerState = rendSys.createRasterizerState("DefaultRasterizerState"); pRasterizerState->setPolygonMode(PM_WIREFRAME); EffectSharedPtr pEffect = rendSys.createEffectFromFile("simple_effect","Tutorial03.fx"); //set render context RenderContextSharedPtr pRenderContext = rendSys.createRenderContext("RenderContext1"); pRenderContext->appendRenderTarget(pRenderTarget); pRenderContext->setBlendState(pBlendState); pRenderContext->setDepthStencilState(pDepthStencilState); pRenderContext->setRasterizerState(pRasterizerState); // pRenderContext->setEffect(pEffect, "Render", "P0"); //create material MaterialManager& materialMgr = root.getMaterialManager(); MaterialSharedPtr pMaterial = materialMgr.createMaterial("lambert1"); pMaterial->setEffect(pEffect, "Render", "P0"); //set scene SceneManager& sceneMgr = root.getSceneManager(); CameraSharedPtr pCamera = sceneMgr.createCamera("camera1"); pCamera->setPosition(0,200,200); pCamera->lookAt(0,100,-1); pCamera->setNearClipDistance(5.0f); pCamera->setFarClipDistance(1000.0f); pCamera->setFOVy(Radian(Math::PI/3.0)); sceneMgr.setActiveCamera(pCamera); SceneNode& rootNode = sceneMgr.getRootSceneNode(); SceneNodeSharedPtr pNode = rootNode.createChildSceneNode("child1", Vector3(0,0,0)); pNode->rotate(Vector3::UNIT_Y, Radian(Math::PI/4.0)); EntitySharedPtr pEntity = sceneMgr.createEntity("entity1","sausageman_006.ma.mesh.xml"); pEntity->addRendering(pRenderContext); pNode->attachObject(pEntity); // Infinite loop, until broken out of by frame listeners // or break out by calling queueEndRendering() bool mQueuedEnd = false; while( !mQueuedEnd ) { //Pump messages in all registered RenderWindow windows RenderWindow::messagePump(); preProcess(); root.renderOneFrame(); /*if (!renderOneFrame()) break;*/ } return 0; }