mirror of
https://github.com/minetest/irrlicht.git
synced 2024-11-06 18:30:40 +01:00
245 lines
9.7 KiB
HTML
245 lines
9.7 KiB
HTML
|
<html>
|
||
|
|
<head>
|
||
|
|
<title>Irrlicht Engine Tutorial</title>
|
||
|
|
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||
|
|
</head>
|
||
|
|
|
||
|
|
<body bgcolor="#FFFFFF" leftmargin="0" topmargin="0" marginwidth="0" marginheight="0">
|
||
|
|
<br>
|
||
|
|
<table width="95%" border="0" cellspacing="0" cellpadding="2" align="center">
|
||
|
|
<tr>
|
||
|
|
<td bgcolor="#666699" width="10"><b><a href="http://irrlicht.sourceforge.net" target="_blank"><img src="../../media/irrlichtlogo.jpg" width="88" height="31" border="0"></a></b></td>
|
||
|
|
<td bgcolor="#666699" width="100%">
|
||
|
|
<div align="center">
|
||
|
|
<div align="left"><b><font color="#FFFFFF">Tutorial 13. Render to Texture</font></b></div>
|
||
|
|
</div>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
<tr bgcolor="#eeeeff">
|
||
|
|
<td height="90" colspan="2">
|
||
|
|
<div align="left">
|
||
|
|
<p> This tutorial shows how to render to a texture using Irrlicht. Render
|
||
|
|
to texture is a feature with which it is possible to create nice special
|
||
|
|
effects. In addition, this tutorial shows how to enable specular highlights.</p>
|
||
|
|
<p>The program which is described here will look like this:</p>
|
||
|
|
<p align="center"><img src="../../media/013shot.jpg" width="256" height="200"><br>
|
||
|
|
</p>
|
||
|
|
</div>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
<br>
|
||
|
|
<table width="95%" border="0" cellspacing="0" cellpadding="2" align="center">
|
||
|
|
<tr>
|
||
|
|
<td bgcolor="#666699"> <b><font color="#FFFFFF">Lets start!</font></b></td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
<td height="90" bgcolor="#eeeeff" valign="top"> <div align="left">
|
||
|
|
<div align="left">
|
||
|
|
<p>In the beginning, everything as usual. Include the needed headers,
|
||
|
|
ask the user for the rendering driver, create the Irrlicht Device:</p>
|
||
|
|
<table width="95%" border="0" cellspacing="2" cellpadding="0" bgcolor="#CCCCCC" align="center">
|
||
|
|
<tr>
|
||
|
|
<td><pre>#include <irrlicht.h>
|
||
|
|
#include <iostream>
|
||
|
|
|
||
|
|
using namespace irr;
|
||
|
|
|
||
|
|
#pragma comment(lib, "Irrlicht.lib")
|
||
|
|
|
||
|
|
int main()
|
||
|
|
{
|
||
|
|
// let user select driver type
|
||
|
|
|
||
|
|
video::E_DRIVER_TYPE driverType = video::EDT_DIRECT3D9;
|
||
|
|
|
||
|
|
printf("Please select the driver you want for this example:\n"\<br> " (a) Direct3D 9.0c\n (b) Direct3D 8.1\n (c) OpenGL 1.5\n"\<br> " (d) Software Renderer\n (e) Apfelbaum Software Renderer\n"\<br> " (f) NullDevice\n (otherKey) exit\n\n");
|
||
|
|
|
||
|
|
char i;
|
||
|
|
std::cin >> i;
|
||
|
|
|
||
|
|
switch(i)<br> {<br> case 'a': driverType = video::EDT_DIRECT3D9;break;<br> case 'b': driverType = video::EDT_DIRECT3D8;break;<br> case 'c': driverType = video::EDT_OPENGL; break;<br> case 'd': driverType = video::EDT_SOFTWARE; break;<br> case 'e': driverType = video::EDT_BURNINGSVIDEO;break;<br> case 'f': driverType = video::EDT_NULL; break;<br> default: return 1;<br> }
|
||
|
|
|
||
|
|
// create device and exit if creation failed
|
||
|
|
|
||
|
|
IrrlichtDevice *device =
|
||
|
|
createDevice(driverType, core::dimension2d<s32>(640, 480),
|
||
|
|
16, false, false);
|
||
|
|
|
||
|
|
if (device == 0)
|
||
|
|
return 1; // could not create selected driver.
|
||
|
|
|
||
|
|
video::IVideoDriver* driver = device->getVideoDriver();
|
||
|
|
scene::ISceneManager* smgr = device->getSceneManager();
|
||
|
|
gui::IGUIEnvironment* env = device->getGUIEnvironment();</pre></td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
<p>Now, we load an animated mesh to be displayed. As in most examples,
|
||
|
|
we'll take the fairy md2 model. The difference here: We set the shininess<br>
|
||
|
|
of the model to a value other than 0 which is the default value. This
|
||
|
|
enables specular highlights on the model if dynamic lighting is on.
|
||
|
|
The value influences the size of the highlights.</p>
|
||
|
|
<table width="95%" border="0" cellspacing="2" cellpadding="0" bgcolor="#CCCCCC" align="center">
|
||
|
|
<tr>
|
||
|
|
<td><pre>// load and display animated fairy mesh
|
||
|
|
|
||
|
|
scene::IAnimatedMeshSceneNode* fairy = smgr->addAnimatedMeshSceneNode(
|
||
|
|
smgr->getMesh("../../media/faerie.md2"));
|
||
|
|
|
||
|
|
if (fairy)
|
||
|
|
{
|
||
|
|
fairy->setMaterialTexture(0, driver->getTexture("../../media/faerie2.bmp")); // set diffuse texture
|
||
|
|
fairy->setMaterialFlag(video::EMF_LIGHTING, true); // enable dynamic lighting
|
||
|
|
fairy->getMaterial(0).Shininess = 20.0f; // set size of specular highlights
|
||
|
|
fairy->setPosition(core::vector3df(-10,0,-100));
|
||
|
|
}</pre></td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
<p> To make specular highlights appear on the model, we need a dynamic
|
||
|
|
light in the scene. We add one directly in vicinity of the model.
|
||
|
|
In addition, to make the model not that dark, we set the ambient light
|
||
|
|
to gray. </p>
|
||
|
|
<table width="95%" border="0" cellspacing="2" cellpadding="0" bgcolor="#CCCCCC" align="center">
|
||
|
|
<tr>
|
||
|
|
<td><pre>
|
||
|
|
// add white light
|
||
|
|
scene::ILightSceneNode* light = smgr->addLightSceneNode(0,
|
||
|
|
core::vector3df(-15,5,-105), video::SColorf(1.0f, 1.0f, 1.0f));
|
||
|
|
|
||
|
|
// set ambient light
|
||
|
|
driver->setAmbientLight(video::SColor(0,60,60,60));</pre></td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
<p>The next is just some standard stuff: Add a user controlled camera
|
||
|
|
to the scene, disable mouse cursor, and add a test cube and let it
|
||
|
|
rotate to make the scene more interesting.</p>
|
||
|
|
<table width="95%" border="0" cellspacing="2" cellpadding="0" bgcolor="#CCCCCC" align="center">
|
||
|
|
<tr>
|
||
|
|
<td><pre>
|
||
|
|
// add fps camera
|
||
|
|
scene::ICameraSceneNode* fpsCamera = smgr->addCameraSceneNodeFPS();
|
||
|
|
fpsCamera->setPosition(core::vector3df(-50,50,-150));
|
||
|
|
|
||
|
|
// disable mouse cursor
|
||
|
|
device->getCursorControl()->setVisible(false);
|
||
|
|
|
||
|
|
// create test cube
|
||
|
|
scene::ISceneNode* test = smgr->addCubeSceneNode(60);
|
||
|
|
|
||
|
|
// let the cube rotate and set some light settings
|
||
|
|
scene::ISceneNodeAnimator* anim = smgr->createRotationAnimator(
|
||
|
|
core::vector3df(0.3f, 0.3f,0));
|
||
|
|
|
||
|
|
test->setPosition(core::vector3df(-100,0,-100));
|
||
|
|
test->setMaterialFlag(video::EMF_LIGHTING, false); // disable dynamic lighting
|
||
|
|
test->addAnimator(anim);
|
||
|
|
anim->drop();
|
||
|
|
|
||
|
|
// set window caption
|
||
|
|
device->setWindowCaption(L"Irrlicht Engine - Render to Texture and Specular Highlights example");</pre></td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
<p> To test out the render to texture feature, we need a render target
|
||
|
|
texture. These are not like standard textures, but need to be created
|
||
|
|
first. To create one, we call IVideoDriver::createRenderTargetTexture()
|
||
|
|
and specify the size of the texture. Please don't use sizes bigger
|
||
|
|
than the frame buffer for this, because the render target shares the
|
||
|
|
zbuffer with the frame buffer. And because we want to render the scene
|
||
|
|
not from the user camera into the texture, we add another, fixed camera
|
||
|
|
to the scene. But before we do all this, we check if the current running
|
||
|
|
driver is able to render to textures. If it is not, we simply display
|
||
|
|
a warning text.</p>
|
||
|
|
<table width="95%" border="0" cellspacing="2" cellpadding="0" bgcolor="#CCCCCC" align="center">
|
||
|
|
<tr>
|
||
|
|
<td><pre>// create render target
|
||
|
|
video::ITexture* rt = 0;
|
||
|
|
scene::ICameraSceneNode* fixedCam = 0;
|
||
|
|
|
||
|
|
|
||
|
|
if (driver->queryFeature(video::EVDF_RENDER_TO_TARGET))
|
||
|
|
{
|
||
|
|
rt = driver->createRenderTargetTexture(core::dimension2d<s32>(256,256));
|
||
|
|
test->setMaterialTexture(0, rt); // set material of cube to render target
|
||
|
|
|
||
|
|
// add fixed camera
|
||
|
|
fixedCam = smgr->addCameraSceneNode(0, core::vector3df(10,10,-80),
|
||
|
|
core::vector3df(-10,10,-100));
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
// create problem text
|
||
|
|
gui::IGUISkin* skin = env->getSkin();
|
||
|
|
gui::IGUIFont* font = env->getFont("../../media/fonthaettenschweiler.bmp");
|
||
|
|
if (font)
|
||
|
|
skin->setFont(font);
|
||
|
|
|
||
|
|
gui::IGUIStaticText* text = env->addStaticText(
|
||
|
|
L"Your hardware or this renderer is not able to use the "\
|
||
|
|
L"render to texture feature. RTT Disabled.",
|
||
|
|
core::rect<s32>(150,20,470,60));
|
||
|
|
|
||
|
|
text->setOverrideColor(video::SColor(100,255,255,255));
|
||
|
|
}</pre></td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
<p> Nearly finished. Now we need to draw everything. Every frame, we
|
||
|
|
draw the scene twice. Once from the fixed camera into the render target
|
||
|
|
texture and once as usual. When rendering into the render target,
|
||
|
|
we need to disable the visibilty of the test cube, because it has
|
||
|
|
the render target texture applied to it.<br>
|
||
|
|
That's, wasn't quite complicated I hope. :)</p>
|
||
|
|
<table width="95%" border="0" cellspacing="2" cellpadding="0" bgcolor="#CCCCCC" align="center">
|
||
|
|
<tr>
|
||
|
|
<td><pre>while(device->run())
|
||
|
|
if (device->isWindowActive())
|
||
|
|
{
|
||
|
|
driver->beginScene(true, true, 0);
|
||
|
|
|
||
|
|
if (rt)
|
||
|
|
{
|
||
|
|
// draw scene into render target
|
||
|
|
|
||
|
|
// set render target texture
|
||
|
|
driver->setRenderTarget(rt, true, true, video::SColor(0,0,0,255));
|
||
|
|
|
||
|
|
// make cube invisible and set fixed camera as active camera
|
||
|
|
test->setVisible(false);
|
||
|
|
smgr->setActiveCamera(fixedCam);
|
||
|
|
|
||
|
|
// draw whole scene into render buffer
|
||
|
|
smgr->drawAll();
|
||
|
|
|
||
|
|
// set back old render target
|
||
|
|
driver->setRenderTarget(0);
|
||
|
|
|
||
|
|
// make the cube visible and set the user controlled camera as active one
|
||
|
|
test->setVisible(true);
|
||
|
|
smgr->setActiveCamera(fpsCamera);
|
||
|
|
}
|
||
|
|
|
||
|
|
// draw scene normally
|
||
|
|
smgr->drawAll();
|
||
|
|
env->drawAll();
|
||
|
|
|
||
|
|
driver->endScene();
|
||
|
|
}
|
||
|
|
|
||
|
|
if (rt)
|
||
|
|
rt->drop(); // drop render target because we created if with a create() method
|
||
|
|
|
||
|
|
device->drop(); // drop device
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
</pre></td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
|
||
|
|
<p> </p></div>
|
||
|
|
</div>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
<p> </p>
|
||
|
|
</body>
|
||
|
|
</html>
|