/*
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.
In the beginning, everything as usual. Include the needed headers, ask the user for the rendering
driver, create the Irrlicht Device:
*/
#include <irrlicht.h>
#include <iostream>
using namespace irr;
#pragma comment(lib, "Irrlicht.lib")
class MyShaderCallBack : public video::IShaderConstantSetCallBack
{
public:
virtual void OnSetConstants(video::IMaterialRendererServices* services, s32 userData)
{
video::IVideoDriver* driver = services->getVideoDriver();
int c[] =
{
0,1
}
; // sampler2d IDs
services->setPixelShaderConstant("Texture0", (float*)&c[0], 1);
services->setPixelShaderConstant("Texture1", (float*)&c[1], 1);
}
};
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"\
" (a) Direct3D 9.0c\n (b) Direct3D 8.1\n (c) OpenGL 1.5\n"\
" (d) Software Renderer\n (e) Burning's Software Renderer\n"\
" (f) NullDevice\n (otherKey) exit\n\n");
char i;
std::cin >> i;
switch(i)
{
case 'a': driverType = video::EDT_DIRECT3D9;break;
case 'b': driverType = video::EDT_DIRECT3D8;break;
case 'c': driverType = video::EDT_OPENGL; break;
case 'd': driverType = video::EDT_SOFTWARE; break;
case 'e': driverType = video::EDT_BURNINGSVIDEO;break;
case 'f': driverType = video::EDT_NULL; break;
default: return 1;
}
// 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();
/*
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
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.
*/
// 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));
fairy->setMD2Animation ( scene::EMAT_STAND );
}
const char vertShader[] =
"varying vec2 texCoord;\n"
"void main(void)\n"
"\n"
"{\n"
"\n"
"gl_Position = vec4((gl_MultiTexCoord0.xy-0.5)*2,0,1);\n"
" texCoord = gl_MultiTexCoord0;\n"
"}\n";
const char fragShader[] =
"uniform sampler2D Texture0;\n"
"uniform sampler2D Texture1;\n"
"varying vec2 texCoord;\n"
"void main(void)\n"
"{\n"
"vec4 tex = texture2D( Texture0, texCoord );\n"
"vec4 alpha = texture2D( Texture1, texCoord );\n"
"alpha.r= alpha.r + alpha.g +alpha.b;\n"
"gl_FragColor = (tex.rgb,alpha.r);\n"
"} \n";
MyShaderCallBack* mc = new MyShaderCallBack();
video::IGPUProgrammingServices* gpu = driver->getGPUProgrammingServices();
s32 circleShader = gpu->addHighLevelShaderMaterial(
vertShader, "main", video::EVST_VS_1_1,
fragShader, "main", video::EPST_PS_1_1,
mc, video::EMT_TRANSPARENT_ALPHA_CHANNEL);
printf("yay");
scene::ISceneNode*pp=smgr->addCubeSceneNode(10);
pp->setMaterialType((video::E_MATERIAL_TYPE)circleShader);
// 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
smgr->setAmbientLight(video::SColor(0,60,60,60));
/*
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.
*/
// 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");
/*
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.
*/
// create render target
video::ITexture* rt = 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
}
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));
}
/*
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.
That's, wasn't quite complicated I hope. :)
*/
int lastFPS = -1;
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
pp->setVisible(false);
//player distance from camera
smgr->getActiveCamera()->setNearValue(100.0f);
// draw whole scene into render buffer
smgr->drawAll();
driver->setRenderTarget(0);
smgr->getActiveCamera()->setNearValue(0.1f);
pp->setVisible(true);
smgr->drawAll();
}
// draw scene normally
smgr->drawAll();
env->drawAll();
driver->endScene();
// display frames per second in window title
int fps = driver->getFPS();
if (lastFPS != fps)
{
core::stringw str = L"Irrlicht Engine - Render to Texture and Specular Highlights example";
str += " FPS:";
str += fps;
device->setWindowCaption(str.c_str());
lastFPS = fps;
}
}
if (rt)
rt->drop(); // drop render target because we created if with a create() method
device->drop(); // drop device
return 0;
}