OpenSceneGraph/examples/osgspotlight/osgspotlight.cpp
2016-05-26 11:13:56 +01:00

294 lines
9.2 KiB
C++

/* OpenSceneGraph example, osgspotlight.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <osg/Notify>
#include <osg/MatrixTransform>
#include <osg/ShapeDrawable>
#include <osg/PositionAttitudeTransform>
#include <osg/Geometry>
#include <osg/Texture2D>
#include <osg/Geode>
#include <osg/LightSource>
#include <osg/TexGenNode>
#include <osgUtil/Optimizer>
#include <osgDB/Registry>
#include <osgDB/ReadFile>
#include <osgViewer/Viewer>
// for the grid data..
#include "../osghangglide/terrain_coords.h"
osg::Image* createSpotLightImage(const osg::Vec4& centerColour, const osg::Vec4& backgroudColour, unsigned int size, float power)
{
osg::Image* image = new osg::Image;
image->allocateImage(size,size,1,
GL_RGBA,GL_UNSIGNED_BYTE);
float mid = (float(size)-1)*0.5f;
float div = 2.0f/float(size);
for(unsigned int r=0;r<size;++r)
{
unsigned char* ptr = image->data(0,r,0);
for(unsigned int c=0;c<size;++c)
{
float dx = (float(c) - mid)*div;
float dy = (float(r) - mid)*div;
float pr = powf(1.0f-sqrtf(dx*dx+dy*dy),power);
if (pr<0.0f) pr=0.0f;
osg::Vec4 color = centerColour*r+backgroudColour*(1.0f-pr);
*ptr++ = (unsigned char)((color[0])*255.0f);
*ptr++ = (unsigned char)((color[1])*255.0f);
*ptr++ = (unsigned char)((color[2])*255.0f);
*ptr++ = (unsigned char)((color[3])*255.0f);
}
}
return image;
//return osgDB::readImageFile("spot.dds");
}
osg::StateSet* createSpotLightDecoratorState(unsigned int lightNum, unsigned int textureUnit)
{
osg::StateSet* stateset = new osg::StateSet;
stateset->setMode(GL_LIGHT0+lightNum, osg::StateAttribute::ON);
osg::Vec4 centerColour(1.0f,1.0f,1.0f,1.0f);
osg::Vec4 ambientColour(0.05f,0.05f,0.05f,1.0f);
// set up spot light texture
osg::Texture2D* texture = new osg::Texture2D();
texture->setImage(createSpotLightImage(centerColour, ambientColour, 64, 1.0));
texture->setBorderColor(osg::Vec4(ambientColour));
texture->setWrap(osg::Texture::WRAP_S,osg::Texture::CLAMP_TO_BORDER);
texture->setWrap(osg::Texture::WRAP_T,osg::Texture::CLAMP_TO_BORDER);
texture->setWrap(osg::Texture::WRAP_R,osg::Texture::CLAMP_TO_BORDER);
stateset->setTextureAttributeAndModes(textureUnit, texture, osg::StateAttribute::ON);
// set up tex gens
stateset->setTextureMode(textureUnit, GL_TEXTURE_GEN_S, osg::StateAttribute::ON);
stateset->setTextureMode(textureUnit, GL_TEXTURE_GEN_T, osg::StateAttribute::ON);
stateset->setTextureMode(textureUnit, GL_TEXTURE_GEN_R, osg::StateAttribute::ON);
stateset->setTextureMode(textureUnit, GL_TEXTURE_GEN_Q, osg::StateAttribute::ON);
return stateset;
}
osg::Node* createSpotLightNode(const osg::Vec3& position, const osg::Vec3& direction, float angle, unsigned int lightNum, unsigned int textureUnit)
{
osg::Group* group = new osg::Group;
// create light source.
osg::LightSource* lightsource = new osg::LightSource;
osg::Light* light = lightsource->getLight();
light->setLightNum(lightNum);
light->setPosition(osg::Vec4(position,1.0f));
light->setAmbient(osg::Vec4(0.00f,0.00f,0.05f,1.0f));
light->setDiffuse(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
group->addChild(lightsource);
// create tex gen.
osg::Vec3 up(0.0f,0.0f,1.0f);
up = (direction ^ up) ^ direction;
up.normalize();
osg::TexGenNode* texgenNode = new osg::TexGenNode;
texgenNode->setTextureUnit(textureUnit);
osg::TexGen* texgen = texgenNode->getTexGen();
texgen->setMode(osg::TexGen::EYE_LINEAR);
texgen->setPlanesFromMatrix(osg::Matrixd::lookAt(position, position+direction, up)*
osg::Matrixd::perspective(angle,1.0,0.1,100)*
osg::Matrixd::translate(1.0,1.0,1.0)*
osg::Matrixd::scale(0.5,0.5,0.5));
group->addChild(texgenNode);
return group;
}
osg::AnimationPath* createAnimationPath(const osg::Vec3& center,float radius,double looptime)
{
// set up the animation path
osg::AnimationPath* animationPath = new osg::AnimationPath;
animationPath->setLoopMode(osg::AnimationPath::LOOP);
int numSamples = 40;
float yaw = 0.0f;
float yaw_delta = 2.0f*osg::PI/((float)numSamples-1.0f);
float roll = osg::inDegrees(30.0f);
double time=0.0f;
double time_delta = looptime/(double)numSamples;
for(int i=0;i<numSamples;++i)
{
osg::Vec3 position(center+osg::Vec3(sinf(yaw)*radius,cosf(yaw)*radius,0.0f));
osg::Quat rotation(osg::Quat(roll,osg::Vec3(0.0,1.0,0.0))*osg::Quat(-(yaw+osg::inDegrees(90.0f)),osg::Vec3(0.0,0.0,1.0)));
animationPath->insert(time,osg::AnimationPath::ControlPoint(position,rotation));
yaw += yaw_delta;
time += time_delta;
}
return animationPath;
}
osg::Node* createBase(const osg::Vec3& center,float radius)
{
osg::Geode* geode = new osg::Geode;
// set up the texture of the base.
osg::StateSet* stateset = new osg::StateSet();
osg::ref_ptr<osg::Image> image = osgDB::readRefImageFile("Images/lz.rgb");
if (image)
{
osg::Texture2D* texture = new osg::Texture2D;
texture->setImage(image);
stateset->setTextureAttributeAndModes(0,texture,osg::StateAttribute::ON);
}
geode->setStateSet( stateset );
osg::HeightField* grid = new osg::HeightField;
grid->allocate(38,39);
grid->setOrigin(center+osg::Vec3(-radius,-radius,0.0f));
grid->setXInterval(radius*2.0f/(float)(38-1));
grid->setYInterval(radius*2.0f/(float)(39-1));
float minHeight = FLT_MAX;
float maxHeight = -FLT_MAX;
unsigned int r;
for(r=0;r<39;++r)
{
for(unsigned int c=0;c<38;++c)
{
float h = vertex[r+c*39][2];
if (h>maxHeight) maxHeight=h;
if (h<minHeight) minHeight=h;
}
}
float hieghtScale = radius*0.5f/(maxHeight-minHeight);
float hieghtOffset = -(minHeight+maxHeight)*0.5f;
for(r=0;r<39;++r)
{
for(unsigned int c=0;c<38;++c)
{
float h = vertex[r+c*39][2];
grid->setHeight(c,r,(h+hieghtOffset)*hieghtScale);
}
}
geode->addDrawable(new osg::ShapeDrawable(grid));
osg::Group* group = new osg::Group;
group->addChild(geode);
return group;
}
osg::Node* createMovingModel(const osg::Vec3& center, float radius)
{
float animationLength = 10.0f;
osg::AnimationPath* animationPath = createAnimationPath(center,radius,animationLength);
osg::Group* model = new osg::Group;
osg::ref_ptr<osg::Node> cessna = osgDB::readRefNodeFile("cessna.osgt");
if (cessna)
{
const osg::BoundingSphere& bs = cessna->getBound();
float size = radius/bs.radius()*0.3f;
osg::MatrixTransform* positioned = new osg::MatrixTransform;
positioned->setDataVariance(osg::Object::STATIC);
positioned->setMatrix(osg::Matrix::translate(-bs.center())*
osg::Matrix::scale(size,size,size)*
osg::Matrix::rotate(osg::inDegrees(180.0f),0.0f,0.0f,2.0f));
positioned->addChild(cessna);
osg::MatrixTransform* xform = new osg::MatrixTransform;
xform->setUpdateCallback(new osg::AnimationPathCallback(animationPath,0.0f,2.0));
xform->addChild(positioned);
xform->addChild(createSpotLightNode(osg::Vec3(0.0f,0.0f,0.0f), osg::Vec3(0.0f,1.0f,-1.0f), 60.0f, 0, 1));
model->addChild(xform);
}
return model;
}
osg::Node* createModel()
{
osg::Vec3 center(0.0f,0.0f,0.0f);
float radius = 100.0f;
// the shadower model
osg::Node* shadower = createMovingModel(center,radius*0.5f);
// the shadowed model
osg::Node* shadowed = createBase(center-osg::Vec3(0.0f,0.0f,radius*0.1),radius);
// combine the models together to create one which has the shadower and the shadowed with the required callback.
osg::Group* root = new osg::Group;
root->setStateSet(createSpotLightDecoratorState(0,1));
root->addChild(shadower);
root->addChild(shadowed);
return root;
}
int main(int, char **)
{
// construct the viewer.
osgViewer::Viewer viewer;
// add the spoit light model to the viewer
viewer.setSceneData( createModel() );
// run the viewer main frame loop.
return viewer.run();
}