gra: src/GLReflection.cc Source File

00001 #include <gra/reflection/GLReflection.h>
00002 #include <esg/emittance/SpotEmittance.h>
00003 #include <GL/gl.h>
00004 
00005 using namespace gra;
00006 
00007 void GLReflection::setScene(Scene * pScene)
00008 {
00009     LocalReflection::setScene(pScene);
00010     
00011     if (!_pLights) return;
00012 
00013     GLfloat    lPosA[4];
00014     GLfloat    lColA[4];
00015     GLenum     attenuation;
00016     Vector3    src;
00017     Emittance* pEmittance;
00018     Matrix4*   pTrMat;
00019     Color3f    color;
00020 
00021     glMatrixMode(GL_MODELVIEW);
00022     
00023     for (ESGint i = 0; i < LightArray::MAX_LIGHTS; i++) {
00024         if (!_pLights->isSet(i)) continue;
00025         pEmittance = _pLights->getEmittance(i);
00026         if (!pEmittance) continue;
00027 
00028         if (_pLights->isOn(i)) glEnable((GLenum)(GL_LIGHT0+i));
00029         else glDisable((GLenum)(GL_LIGHT0+i));
00030 
00031         pEmittance->intensity(color);
00032         lColA[0] = color.x;
00033         lColA[1] = color.y;
00034         lColA[2] = color.z;
00035         lColA[3] = 1;
00036 
00037         pTrMat = _pLights->getTransformation(i);
00038         
00039         if (pTrMat) {
00040             float m[16];
00041             pTrMat->transpose();
00042             pTrMat->get(m);
00043             pTrMat->transpose();
00044             glPushMatrix();
00045             glMultMatrixf(m);
00046         }
00047 
00048         if (pEmittance->sourceLocation(src)) {
00049             lPosA[0] = src.x;
00050             lPosA[1] = src.y;
00051             lPosA[2] = src.z;
00052             lPosA[3] = 1;
00053         } else
00054             lPosA[3] = 0;
00055 
00056         int fadePower = (int) pEmittance->fadePower();
00057         if (fadePower < 1) attenuation = GL_CONSTANT_ATTENUATION;
00058         else
00059             if (fadePower < 2) attenuation = GL_LINEAR_ATTENUATION;
00060             else
00061                 attenuation = GL_QUADRATIC_ATTENUATION;
00062                               
00063         glLightfv((GLenum)(GL_LIGHT0+i), GL_POSITION, lPosA);
00064         glLightfv((GLenum)(GL_LIGHT0+i), GL_DIFFUSE,  lColA);
00065         //glLightfv((GLenum)(GL_LIGHT0+i), GL_AMBIENT, lAmbA);
00066         glLightfv((GLenum)(GL_LIGHT0+i), GL_SPECULAR, lColA);
00067         glLightf((GLenum)(GL_LIGHT0+i),  attenuation,  1);
00068 
00069         if (IS_INSTANCE_OF(*pEmittance, SpotEmittance)) {
00070             Vector3 vdir;
00071             (void) pEmittance->beamDirection(vdir);
00072             GLfloat dir[4] = { vdir.x, vdir.y, vdir.z, 1};
00073             
00074             glLightfv((GLenum)(GL_LIGHT0+i), GL_SPOT_DIRECTION, dir);
00075             glLighti((GLenum)(GL_LIGHT0+i), GL_SPOT_EXPONENT,
00076                      ((SpotEmittance*)pEmittance)->concentration());
00077             glLightf((GLenum)(GL_LIGHT0+i), GL_SPOT_CUTOFF,
00078                      ((SpotEmittance*)pEmittance)->spreadAngle() * 180 / PI);
00079         }
00080                     
00081         if ((++i) >= GL_MAX_LIGHTS) return;
00082     }
00083 }