220 lines
7.0 KiB
C++
220 lines
7.0 KiB
C++
/*
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This tutorial shows how to render to a texture using Irrlicht. Render to texture is a feature with which
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it is possible to create nice special effects. In addition, this tutorial shows how to enable specular
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highlights.
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In the beginning, everything as usual. Include the needed headers, ask the user for the rendering
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driver, create the Irrlicht Device:
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*/
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#include <irrlicht.h>
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#include <iostream>
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using namespace irr;
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#pragma comment(lib, "Irrlicht.lib")
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int main()
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{
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// let user select driver type
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video::E_DRIVER_TYPE driverType = video::EDT_DIRECT3D9;
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printf("Please select the driver you want for this example:\n"\
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" (a) Direct3D 9.0c\n (b) Direct3D 8.1\n (c) OpenGL 1.5\n"\
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" (d) Software Renderer\n (e) Burning's Software Renderer\n"\
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" (f) NullDevice\n (otherKey) exit\n\n");
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char i;
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std::cin >> i;
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switch(i)
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{
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case 'a': driverType = video::EDT_DIRECT3D9;break;
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case 'b': driverType = video::EDT_DIRECT3D8;break;
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case 'c': driverType = video::EDT_OPENGL; break;
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case 'd': driverType = video::EDT_SOFTWARE; break;
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case 'e': driverType = video::EDT_BURNINGSVIDEO;break;
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case 'f': driverType = video::EDT_NULL; break;
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default: return 1;
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}
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// create device and exit if creation failed
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IrrlichtDevice *device =
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createDevice(driverType, core::dimension2d<s32>(640, 480),
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16, false, false);
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if (device == 0)
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return 1; // could not create selected driver.
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video::IVideoDriver* driver = device->getVideoDriver();
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scene::ISceneManager* smgr = device->getSceneManager();
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gui::IGUIEnvironment* env = device->getGUIEnvironment();
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/*
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Now, we load an animated mesh to be displayed. As in most examples,
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we'll take the fairy md2 model. The difference here: We set the shininess
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of the model to a value other than 0 which is the default value. This
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enables specular highlights on the model if dynamic lighting is on.
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The value influences the size of the highlights.
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*/
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// load and display animated fairy mesh
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scene::IAnimatedMeshSceneNode* fairy = smgr->addAnimatedMeshSceneNode(
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smgr->getMesh("../../media/faerie.md2"));
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if (fairy)
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{
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fairy->setMaterialTexture(0, driver->getTexture("../../media/faerie2.bmp")); // set diffuse texture
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fairy->setMaterialFlag(video::EMF_LIGHTING, true); // enable dynamic lighting
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fairy->getMaterial(0).Shininess = 20.0f; // set size of specular highlights
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fairy->setPosition(core::vector3df(-10,0,-100));
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fairy->setMD2Animation ( scene::EMAT_STAND );
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}
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/*
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To make specular highlights appear on the model, we need a dynamic light in the scene.
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We add one directly in vicinity of the model. In addition, to make the model not that
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dark, we set the ambient light to gray.
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*/
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// add white light
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scene::ILightSceneNode* light = smgr->addLightSceneNode(0,
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core::vector3df(-15,5,-105), video::SColorf(1.0f, 1.0f, 1.0f));
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// set ambient light
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smgr->setAmbientLight(video::SColor(0,60,60,60));
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/*
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The next is just some standard stuff: Add a user controlled camera to the scene, disable
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mouse cursor, and add a test cube and let it rotate to make the scene more interesting.
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*/
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// add fps camera
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scene::ICameraSceneNode* fpsCamera = smgr->addCameraSceneNodeFPS();
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fpsCamera->setPosition(core::vector3df(-50,50,-150));
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// disable mouse cursor
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device->getCursorControl()->setVisible(false);
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// create test cube
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scene::ISceneNode* test = smgr->addCubeSceneNode(60);
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// let the cube rotate and set some light settings
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scene::ISceneNodeAnimator* anim = smgr->createRotationAnimator(
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core::vector3df(0.3f, 0.3f,0));
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test->setPosition(core::vector3df(-100,0,-100));
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test->setMaterialFlag(video::EMF_LIGHTING, false); // disable dynamic lighting
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test->addAnimator(anim);
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anim->drop();
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// set window caption
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device->setWindowCaption(L"Irrlicht Engine - Render to Texture and Specular Highlights example");
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/*
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To test out the render to texture feature, we need a render target texture. These are not
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like standard textures, but need to be created first. To create one, we call
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IVideoDriver::createRenderTargetTexture() and specify the size of the texture. Please
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don't use sizes bigger than the frame buffer for this, because the render target shares
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the zbuffer with the frame buffer. And because we want to render the scene not from the
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user camera into the texture, we add another, fixed camera to the scene. But before we
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do all this, we check if the current running driver is able to render to textures. If
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it is not, we simply display a warning text.
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*/
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// create render target
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video::ITexture* rt = 0;
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scene::ICameraSceneNode* fixedCam = 0;
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if (driver->queryFeature(video::EVDF_RENDER_TO_TARGET))
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{
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rt = driver->createRenderTargetTexture(core::dimension2d<s32>(256,256));
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test->setMaterialTexture(0, rt); // set material of cube to render target
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// add fixed camera
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fixedCam = smgr->addCameraSceneNode(0, core::vector3df(10,10,-80),
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core::vector3df(-10,10,-100));
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}
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else
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{
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// create problem text
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gui::IGUISkin* skin = env->getSkin();
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gui::IGUIFont* font = env->getFont("../../media/fonthaettenschweiler.bmp");
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if (font)
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skin->setFont(font);
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gui::IGUIStaticText* text = env->addStaticText(
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L"Your hardware or this renderer is not able to use the "\
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L"render to texture feature. RTT Disabled.",
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core::rect<s32>(150,20,470,60));
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text->setOverrideColor(video::SColor(100,255,255,255));
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}
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/*
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Nearly finished. Now we need to draw everything. Every frame, we draw the scene twice.
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Once from the fixed camera into the render target texture and once as usual. When rendering
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into the render target, we need to disable the visibilty of the test cube, because it has
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the render target texture applied to it.
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That's, wasn't quite complicated I hope. :)
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*/
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int lastFPS = -1;
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while(device->run())
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if (device->isWindowActive())
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{
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driver->beginScene(true, true, 0);
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if (rt)
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{
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// draw scene into render target
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// set render target texture
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driver->setRenderTarget(rt, true, true, video::SColor(0,0,0,255));
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// make cube invisible and set fixed camera as active camera
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test->setVisible(false);
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smgr->setActiveCamera(fixedCam);
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// draw whole scene into render buffer
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smgr->drawAll();
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// set back old render target
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driver->setRenderTarget(0);
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// make the cube visible and set the user controlled camera as active one
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test->setVisible(true);
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smgr->setActiveCamera(fpsCamera);
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}
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// draw scene normally
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smgr->drawAll();
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env->drawAll();
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driver->endScene();
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// display frames per second in window title
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int fps = driver->getFPS();
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if (lastFPS != fps)
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{
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core::stringw str = L"Irrlicht Engine - Render to Texture and Specular Highlights example";
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str += " FPS:";
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str += fps;
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device->setWindowCaption(str.c_str());
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lastFPS = fps;
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}
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}
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if (rt)
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rt->drop(); // drop render target because we created if with a create() method
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device->drop(); // drop device
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return 0;
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}
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