Source/System/State/Shader/SHL/testSHLProcLights.cpp

   1 // OpenSG example: testSHL
   2 //
   3 // Demonstrates the use of the SHLChunk
   4 // Implements a simple bumpmapping via vertex and fragment shader.
   5
   6 // Headers
   7 #include "OSGGLUT.h"
   8 #include "OSGConfig.h"
   9 #include "OSGSimpleGeometry.h"
  10 #include "OSGGLUT.h"
  11 #include "OSGGLUTWindow.h"
  12 #include "OSGSimpleSceneManager.h"
  13 #include "OSGAction.h"
  14 #include "OSGSceneFileHandler.h"
  15 #include "OSGBaseFunctions.h"
  16
  17 #include "OSGNode.h"
  18 #include "OSGGroup.h"
  19 #include "OSGTransform.h"
  20 #include "OSGPointLight.h"
  21
  22 #include "OSGImage.h"
  23 #include "OSGChunkMaterial.h"
  24 #include "OSGMaterialChunk.h"
  25 #include "OSGSimpleSHLChunk.h"
  26 #include "OSGGLFuncProtos.h"
  27
  28 // vertex shader program for bump mapping in surface local coordinates
  29 static std::string _vp_program =
  30 "uniform bool Light0Active;\n"
  31 "uniform bool Light1Active;\n"
  32 "uniform bool Light2Active;\n"
  33 "vec4 Ambient;\n"
  34 "vec4 Diffuse;\n"
  35 "vec4 Specular;\n"
  36 "\n"
  37 "\n"
  38 "    void pointLight(in int i, in vec3 normal, in vec3 eye, in vec3 ecPosition3)\n"
  39 "    {\n"
  40 "        float nDotVP;         // normal . light direction\n"
  41 "        float nDotHV;         // normal . light half vector\n"
  42 "        float pf;                   // power factor\n"
  43 "        float attenuation;    // computed attenuation factor\n"
  44 "        float d;                    // distance from surface to light source\n"
  45 "        vec3  VP;               // direction from surface to light position\n"
  46 "        vec3  halfVector;    // direction of maximum highlights\n"
  47 "\n"
  48 "        // Compute vector from surface to light position\n"
  49 "        VP = vec3 (gl_LightSource[i].position) - ecPosition3;\n"
  50 "\n"
  51 "        // Compute distance between surface and light position\n"
  52 "        d = length(VP);\n"
  53 "\n"
  54 "        // Normalize the vector from surface to light position\n"
  55 "        VP = normalize(VP);\n"
  56 "\n"
  57 "        // Compute attenuation\n"
  58 "        attenuation = 1.0 / (gl_LightSource[i].constantAttenuation +\n"
  59 "                      gl_LightSource[i].linearAttenuation * d +\n"
  60 "                      gl_LightSource[i].quadraticAttenuation * d * d);\n"
  61 "        halfVector = normalize(VP + eye);\n"
  62 "        nDotVP = max(0.0, dot(normal, VP));\n"
  63 "        nDotHV = max(0.0, dot(normal, halfVector));\n"
  64 "\n"
  65 "        if (nDotVP == 0.0)\n"
  66 "            pf = 0.0;\n"
  67 "        else\n"
  68 "            pf = pow(nDotHV, gl_FrontMaterial.shininess);\n"
  69 "\n"
  70 "        Ambient  += gl_LightSource[i].ambient * attenuation;\n"
  71 "        Diffuse  += gl_LightSource[i].diffuse * nDotVP * attenuation;\n"
  72 "        Specular += gl_LightSource[i].specular * pf * attenuation;\n"
  73 "    }\n"
  74 "\n"
  75 "    vec3 fnormal(void)\n"
  76 "    {\n"
  77 "        //Compute the normal\n"
  78 "        vec3 normal = gl_NormalMatrix * gl_Normal;\n"
  79 "        normal = normalize(normal);\n"
  80 "        return normal;\n"
  81 "    }\n"
  82 "\n"
  83 "    void flight(in vec3 normal, in vec4 ecPosition, float alphaFade)\n"
  84 "    {\n"
  85 "        vec4 color;\n"
  86 "        vec3 ecPosition3;\n"
  87 "        vec3 eye;\n"
  88 "\n"
  89 "        ecPosition3 = (vec3 (ecPosition)) / ecPosition.w;\n"
  90 "        eye = vec3 (0.0, 0.0, 1.0);\n"
  91 "\n"
  92 "        // Clear the light intensity accumulators\n"
  93 "        Ambient  = vec4 (0.0);\n"
  94 "        Diffuse  = vec4 (0.0);\n"
  95 "        Specular = vec4 (0.0);\n"
  96 "\n"
  97 "       if(Light0Active)\n"
  98 "           pointLight(0, normal, eye, ecPosition3);\n"
  99 "\n"
 100 "       if(Light1Active)\n"
 101 "           pointLight(1, normal, eye, ecPosition3);\n"
 102 "\n"
 103 "       if(Light2Active)\n"
 104 "           pointLight(2, normal, eye, ecPosition3);\n"
 105 "\n"
 106 "        color = gl_FrontLightModelProduct.sceneColor +\n"
 107 "                    Ambient  * gl_FrontMaterial.ambient +\n"
 108 "                    Diffuse  * gl_FrontMaterial.diffuse;\n"
 109 "        color += Specular * gl_FrontMaterial.specular;\n"
 110 "        color = clamp( color, 0.0, 1.0 );\n"
 111 "        gl_FrontColor = color;\n"
 112 "        gl_FrontColor.a *= alphaFade;\n"
 113 "\n"
 114 "    }\n"
 115 "\n"
 116 "    void main(void)\n"
 117 "    {\n"
 118 "        vec3  transformedNormal;\n"
 119 "        float alphaFade = 1.0;\n"
 120 "\n"
 121 "        // Eye-coordinate position of vertex, needed in various calculations\n"
 122 "        vec4 ecPosition = gl_ModelViewMatrix * gl_Vertex;\n"
 123 "\n"
 124 "        // Do fixed functionality vertex transform\n"
 125 "        gl_Position = ftransform();\n"
 126 "        transformedNormal = fnormal();\n"
 127 "        flight(transformedNormal, ecPosition, alphaFade);\n"
 128 "    }\n";
 129
 130 // fragment shader program for bump mapping in surface local coordinates
 131 static std::string _fp_program =
 132 "void main (void)\n"
 133 "{\n"
 134 "    vec4 color;\n"
 135 "    color = gl_Color;\n"
 136 "    gl_FragColor = color;\n"
 137 "}\n";
 138
 139
 140 // ------------------- global vars ----------------------
 141 //
 142 // The SimpleSceneManager to manage simple applications
 143 static OSG::SimpleSceneManagerRefPtr _mgr;
 144 // The scene
 145 static OSG::NodeRecPtr       _scene;
 146 static OSG::PointLightRecPtr _point1_core;
 147 static OSG::PointLightRecPtr _point2_core;
 148 static OSG::PointLightRecPtr _point3_core;
 149
 150 OSG::NodeUnrecPtr point1_beacon;
 151 OSG::NodeUnrecPtr point2_beacon;
 152 OSG::NodeUnrecPtr point3_beacon;
 153
 154 // forward declaration so we can have the interesting stuff upfront
 155 int setupGLUT( int *argc, char *argv[] );
 156
 157 // Shows how to add your own parameter callbacks.
 158
 159 static void light0Active(OSG::DrawEnv *pEnv, OSG::Int32 iLoc)
 160 {
 161     if(iLoc != -1)
 162     {
 163         OSGGETGLFUNC_EXT(glUniform1i,
 164                          osgGlUniform1i,
 165                          OSG::ShaderProgram::getFuncIdUniform1i());
 166
 167         osgGlUniform1i(iLoc,
 168                        GLint(pEnv->getLightState() & 0x0001));
 169     }
 170 }
 171
 172 static void light1Active(OSG::DrawEnv *pEnv, OSG::Int32 iLoc)
 173 {
 174     if(iLoc != -1)
 175     {
 176         OSGGETGLFUNC_EXT(glUniform1i,
 177                          osgGlUniform1i,
 178                          OSG::ShaderProgram::getFuncIdUniform1i());
 179
 180         osgGlUniform1i(iLoc,
 181                        GLint(pEnv->getLightState() & 0x0002));
 182     }
 183 }
 184
 185 static void light2Active(OSG::DrawEnv *pEnv, OSG::Int32 iLoc)
 186 {
 187     if(iLoc != -1)
 188     {
 189         OSGGETGLFUNC_EXT(glUniform1i,
 190                          osgGlUniform1i,
 191                          OSG::ShaderProgram::getFuncIdUniform1i());
 192
 193         osgGlUniform1i(iLoc,
 194                        GLint(pEnv->getLightState() & 0x0004));
 195     }
 196 }
 197
 198 // Initialize GLUT & OpenSG and set up the scene
 199 int doMain(int argc, char **argv)
 200 {
 201     printf("Press key '1', '2', or '3' to toggle the light sources.\n");
 202     // OSG init
 203     OSG::osgInit(argc,argv);
 204
 205     // GLUT init
 206     int winid = setupGLUT(&argc, argv);
 207
 208     // the connection between GLUT and OpenSG
 209     OSG::GLUTWindowUnrecPtr gwin= OSG::GLUTWindow::create();
 210
 211     gwin->setGlutId(winid);
 212     gwin->setSize( 800, 800 );
 213     gwin->init();
 214
 215     // Create the shader material
 216
 217     OSG::ChunkMaterialUnrecPtr cmat = OSG::ChunkMaterial::create();
 218
 219     OSG::MaterialChunkUnrecPtr matc = OSG::MaterialChunk::create();
 220
 221     matc->setAmbient(OSG::Color4f(0.1f, 0.1f, 0.1f, 1.0f));
 222     matc->setDiffuse(OSG::Color4f(0.3f, 0.3f, 0.3f, 1.0f));
 223     matc->setSpecular(OSG::Color4f(0.8f, 0.8f, 0.8f, 1.0f));
 224     matc->setShininess(100);
 225     matc->setLit(true);
 226
 227     OSG::SimpleSHLChunkUnrecPtr shl = OSG::SimpleSHLChunk::create();
 228
 229     shl->setVertexProgram(_vp_program);
 230     shl->setFragmentProgram(_fp_program);
 231     shl->addProceduralVariable("Light0Active", &light0Active);
 232     shl->addProceduralVariable("Light1Active", &light1Active);
 233     shl->addProceduralVariable("Light2Active", &light2Active);
 234
 235     cmat->addChunk(matc);
 236     cmat->addChunk(shl);
 237
 238     // create root node
 239     _scene = OSG::Node::create();
 240
 241     // create two light sources.
 242
 243     OSG::TransformUnrecPtr point1_trans;
 244
 245     OSG::NodeUnrecPtr point1        =
 246         OSG::makeCoredNode<OSG::PointLight>(&_point1_core);
 247     point1_beacon = OSG::makeCoredNode<OSG::Transform >(&point1_trans);
 248
 249     point1_trans->editMatrix().setTranslate(-10.0, 5.0, 5.0);
 250
 251     _point1_core->setAmbient(0.0f, 0.0f, 0.0f , 1.0f);
 252     _point1_core->setDiffuse(1.0f, 0.0f, 0.0f, 1.0f);
 253     _point1_core->setSpecular(1.0f, 1.0f, 1.0f, 1.0f);
 254     _point1_core->setBeacon(point1_beacon);
 255     _point1_core->setOn(true);
 256
 257
 258     OSG::TransformUnrecPtr point2_trans;
 259
 260     OSG::NodeUnrecPtr point2        =
 261         OSG::makeCoredNode<OSG::PointLight>(&_point2_core);
 262     point2_beacon = OSG::makeCoredNode<OSG::Transform >(&point2_trans);
 263
 264     point2_trans->editMatrix().setTranslate(10.0, 5.0, 5.0);
 265
 266     _point2_core->setAmbient(0.0f, 0.0f, 0.0f, 1.0f);
 267     _point2_core->setDiffuse(0.0f, 1.0f, 0.0f, 1.0f);
 268     _point2_core->setSpecular(1.0f, 1.0f, 1.0f, 1.0f);
 269     _point2_core->setBeacon(point2_beacon);
 270     _point2_core->setOn(true);
 271
 272     point1->addChild(point2);
 273
 274     OSG::TransformUnrecPtr point3_trans;
 275
 276     OSG::NodeUnrecPtr point3        =
 277         OSG::makeCoredNode<OSG::PointLight>(&_point3_core);
 278
 279     point3_beacon = OSG::makeCoredNode<OSG::Transform >(&point3_trans);
 280
 281     point3_trans->editMatrix().setTranslate(0.0, -12.0, 5.0);
 282
 283     _point3_core->setAmbient(0.0f, 0.0f, 0.0f, 1.0f);
 284     _point3_core->setDiffuse(0.5f, 0.0f, 1.0f, 1.0f);
 285     _point3_core->setSpecular(1.0f, 1.0f, 1.0f, 1.0f);
 286     _point3_core->setBeacon(point3_beacon);
 287     _point3_core->setOn(true);
 288
 289     point2->addChild(point3);
 290
 291
 292     // create a sphere.
 293     OSG::GeometryUnrecPtr geo = OSG::makeLatLongSphereGeo (100, 100, 1.0);
 294
 295     geo->setMaterial(cmat);
 296
 297
 298     OSG::NodeUnrecPtr sphere = OSG::makeNodeFor(geo);
 299
 300     point3->addChild(sphere);
 301
 302
 303     _scene->setCore(OSG::Group::create());
 304     _scene->addChild(point1);
 305
 306     // create the SimpleSceneManager helper
 307     _mgr = OSG::SimpleSceneManager::create();
 308
 309     // tell the manager what to manage
 310     _mgr->setWindow(gwin );
 311     _mgr->setRoot(_scene);
 312
 313     _mgr->turnHeadlightOff();
 314
 315     // show the whole scene
 316     _mgr->showAll();
 317
 318     // enable local lights.
 319 //    OSG::RenderAction *ract =
 320 //        dynamic_cast<OSG::RenderAction *>(_mgr->getRenderAction());
 321
 322 //    ract->setLocalLights(true);
 323
 324     return 0;
 325 }
 326
 327 // Initialize GLUT & OpenSG and set up the scene
 328 int main(int argc, char **argv)
 329 {
 330     if(doMain(argc, argv) != 0)
 331         return 1;
 332
 333     // GLUT main loop
 334     glutMainLoop();
 335
 336     return 0;
 337 }
 338
 339 //
 340 // GLUT callback functions
 341 //
 342
 343 // redraw the window
 344 void display(void)
 345 {
 346   // render scene
 347   _mgr->redraw();
 348 }
 349
 350 // react to size changes
 351 void reshape(int w, int h)
 352 {
 353     _mgr->resize(w, h);
 354     glutPostRedisplay();
 355 }
 356
 357 // react to mouse button presses
 358 void mouse(int button, int state, int x, int y)
 359 {
 360     if (state)
 361         _mgr->mouseButtonRelease(button, x, y);
 362     else
 363         _mgr->mouseButtonPress(button, x, y);
 364
 365     glutPostRedisplay();
 366 }
 367
 368 // react to mouse motions with pressed buttons
 369 void motion(int x, int y)
 370 {
 371     _mgr->mouseMove(x, y);
 372     glutPostRedisplay();
 373 }
 374
 375 // react to keys
 376 void keyboard(unsigned char k, int x, int y)
 377 {
 378     switch(k)
 379     {
 380         case 27:
 381         case 'q':
 382             _scene       = NULL;
 383             _point1_core = NULL;
 384             _point2_core = NULL;
 385             _point3_core = NULL;
 386
 387             point1_beacon = NULL;
 388             point2_beacon = NULL;
 389             point3_beacon = NULL;
 390
 391             _mgr          = NULL;
 392
 393             OSG::osgExit();
 394
 395             exit(1);
 396         break;
 397         case 'w':
 398             OSG::SceneFileHandler::the()->write(_scene, "scene.osb.gz", true);
 399             printf("wrote scene.osb.gz\n");
 400         break;
 401         case '1':
 402         {
 403             if(_point1_core->getOn() == false)
 404                 _point1_core->setOn(true);
 405             else
 406                 _point1_core->setOn(false);
 407             break;
 408         }
 409
 410         case '2':
 411         {
 412             if(_point2_core->getOn() == false)
 413                 _point2_core->setOn(true);
 414             else
 415                 _point2_core->setOn(false);
 416             break;
 417         }
 418
 419         case '3':
 420         {
 421             if(_point3_core->getOn() == false)
 422                 _point3_core->setOn(true);
 423             else
 424                 _point3_core->setOn(false);
 425             break;
 426         }
 427     }
 428
 429     glutPostRedisplay();
 430 }
 431
 432 // setup the GLUT library which handles the windows for us
 433 int setupGLUT(int *argc, char *argv[])
 434 {
 435     glutInit(argc, argv);
 436     glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);
 437
 438     int winid = glutCreateWindow("OpenSG CG Shader");
 439
 440     glutReshapeFunc(reshape);
 441     glutDisplayFunc(display);
 442     glutMouseFunc(mouse);
 443     glutMotionFunc(motion);
 444     glutKeyboardFunc(keyboard);
 445
 446     return winid;
 447 }
 448
 449