Source/System/State/Shader/Chunks/testSHLOSGLights_shaderprog.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 "OSGShaderProgramChunk.h"
  26 #include "OSGShaderProgram.h"
  27
  28 // vertex shader program for bump mapping in surface local coordinates
  29 static std::string _vp_program =
  30 "uniform bool OSGLight0Active;\n"
  31 "uniform bool OSGLight1Active;\n"
  32 "uniform bool OSGLight2Active;\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(OSGLight0Active)\n"
  98 "           pointLight(0, normal, eye, ecPosition3);\n"
  99 "\n"
 100 "       if(OSGLight1Active)\n"
 101 "           pointLight(1, normal, eye, ecPosition3);\n"
 102 "\n"
 103 "       if(OSGLight2Active)\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
 158 // Initialize GLUT & OpenSG and set up the scene
 159 int doMain(int argc, char **argv)
 160 {
 161     printf("Press key '1', '2', or '3' to toggle the light sources.\n");
 162     // OSG init
 163     OSG::osgInit(argc,argv);
 164
 165     // GLUT init
 166     int winid = setupGLUT(&argc, argv);
 167
 168     // the connection between GLUT and OpenSG
 169     OSG::GLUTWindowUnrecPtr gwin= OSG::GLUTWindow::create();
 170
 171     gwin->setGlutId(winid);
 172     gwin->setSize( 800, 800 );
 173     gwin->init();
 174
 175     // Create the shader material
 176
 177     OSG::ChunkMaterialUnrecPtr cmat = OSG::ChunkMaterial::create();
 178
 179     OSG::MaterialChunkUnrecPtr matc = OSG::MaterialChunk::create();
 180
 181     matc->setAmbient(OSG::Color4f(0.1f, 0.1f, 0.1f, 1.0f));
 182     matc->setDiffuse(OSG::Color4f(0.3f, 0.3f, 0.3f, 1.0f));
 183     matc->setSpecular(OSG::Color4f(0.8f, 0.8f, 0.8f, 1.0f));
 184     matc->setShininess(100);
 185     matc->setLit(true);
 186
 187     OSG::ShaderProgramChunkUnrecPtr shl = OSG::ShaderProgramChunk::create();
 188
 189     OSG::ShaderProgramUnrecPtr shl_vp =
 190         OSG::ShaderProgram::createVertexShader();
 191
 192     shl_vp->setProgram(_vp_program);
 193
 194     shl->addShader(shl_vp);
 195
 196
 197     OSG::ShaderProgramUnrecPtr shl_fp =
 198         OSG::ShaderProgram::createFragmentShader();
 199
 200     shl_fp->setProgram(_fp_program);
 201
 202     shl->addShader(shl_fp);
 203
 204
 205     shl_vp->addOSGVariable("OSGLight0Active");
 206     shl_vp->addOSGVariable("OSGLight1Active");
 207     shl_vp->addOSGVariable("OSGLight2Active");
 208
 209     cmat->addChunk(matc);
 210     cmat->addChunk(shl);
 211
 212     // create root node
 213     _scene = OSG::Node::create();
 214
 215     // create two light sources.
 216
 217     OSG::TransformUnrecPtr point1_trans;
 218
 219     OSG::NodeUnrecPtr point1        =
 220         OSG::makeCoredNode<OSG::PointLight>(&_point1_core);
 221     point1_beacon = OSG::makeCoredNode<OSG::Transform >(&point1_trans);
 222
 223     point1_trans->editMatrix().setTranslate(-10.0, 5.0, 5.0);
 224
 225     _point1_core->setAmbient(0.0f, 0.0f, 0.0f , 1.0f);
 226     _point1_core->setDiffuse(1.0f, 0.0f, 0.0f, 1.0f);
 227     _point1_core->setSpecular(1.0f, 1.0f, 1.0f, 1.0f);
 228     _point1_core->setBeacon(point1_beacon);
 229     _point1_core->setOn(true);
 230
 231
 232     OSG::TransformUnrecPtr point2_trans;
 233
 234     OSG::NodeUnrecPtr point2        =
 235         OSG::makeCoredNode<OSG::PointLight>(&_point2_core);
 236     point2_beacon = OSG::makeCoredNode<OSG::Transform >(&point2_trans);
 237
 238     point2_trans->editMatrix().setTranslate(10.0, 5.0, 5.0);
 239
 240     _point2_core->setAmbient(0.0f, 0.0f, 0.0f, 1.0f);
 241     _point2_core->setDiffuse(0.0f, 1.0f, 0.0f, 1.0f);
 242     _point2_core->setSpecular(1.0f, 1.0f, 1.0f, 1.0f);
 243     _point2_core->setBeacon(point2_beacon);
 244     _point2_core->setOn(true);
 245
 246     point1->addChild(point2);
 247
 248     OSG::TransformUnrecPtr point3_trans;
 249
 250     OSG::NodeUnrecPtr point3        =
 251         OSG::makeCoredNode<OSG::PointLight>(&_point3_core);
 252
 253     point3_beacon = OSG::makeCoredNode<OSG::Transform >(&point3_trans);
 254
 255     point3_trans->editMatrix().setTranslate(0.0, -12.0, 5.0);
 256
 257     _point3_core->setAmbient(0.0f, 0.0f, 0.0f, 1.0f);
 258     _point3_core->setDiffuse(0.5f, 0.0f, 1.0f, 1.0f);
 259     _point3_core->setSpecular(1.0f, 1.0f, 1.0f, 1.0f);
 260     _point3_core->setBeacon(point3_beacon);
 261     _point3_core->setOn(true);
 262
 263     point2->addChild(point3);
 264
 265
 266     // create a sphere.
 267     OSG::GeometryUnrecPtr geo = OSG::makeLatLongSphereGeo (100, 100, 1.0);
 268
 269     geo->setMaterial(cmat);
 270
 271
 272     OSG::NodeUnrecPtr sphere = OSG::makeNodeFor(geo);
 273
 274     point3->addChild(sphere);
 275
 276
 277     _scene->setCore(OSG::Group::create());
 278     _scene->addChild(point1);
 279
 280     // create the SimpleSceneManager helper
 281     _mgr = OSG::SimpleSceneManager::create();
 282
 283     // tell the manager what to manage
 284     _mgr->setWindow(gwin );
 285     _mgr->setRoot(_scene);
 286
 287     _mgr->turnHeadlightOff();
 288
 289     // show the whole scene
 290     _mgr->showAll();
 291
 292     // enable local lights.
 293 //    OSG::RenderAction *ract =
 294 //        dynamic_cast<OSG::RenderAction *>(_mgr->getRenderAction());
 295
 296 //    ract->setLocalLights(true);
 297
 298     return 0;
 299 }
 300
 301 // Initialize GLUT & OpenSG and set up the scene
 302 int main(int argc, char **argv)
 303 {
 304     if(doMain(argc, argv) != 0)
 305         return 1;
 306
 307     // GLUT main loop
 308     glutMainLoop();
 309
 310     return 0;
 311 }
 312
 313 //
 314 // GLUT callback functions
 315 //
 316
 317 // redraw the window
 318 void display(void)
 319 {
 320   // render scene
 321   _mgr->redraw();
 322 }
 323
 324 // react to size changes
 325 void reshape(int w, int h)
 326 {
 327     _mgr->resize(w, h);
 328     glutPostRedisplay();
 329 }
 330
 331 // react to mouse button presses
 332 void mouse(int button, int state, int x, int y)
 333 {
 334     if (state)
 335         _mgr->mouseButtonRelease(button, x, y);
 336     else
 337         _mgr->mouseButtonPress(button, x, y);
 338
 339     glutPostRedisplay();
 340 }
 341
 342 // react to mouse motions with pressed buttons
 343 void motion(int x, int y)
 344 {
 345     _mgr->mouseMove(x, y);
 346     glutPostRedisplay();
 347 }
 348
 349 // react to keys
 350 void keyboard(unsigned char k, int x, int y)
 351 {
 352     switch(k)
 353     {
 354         case 27:
 355         case 'q':
 356             _scene       = NULL;
 357             _point1_core = NULL;
 358             _point2_core = NULL;
 359             _point3_core = NULL;
 360
 361             point1_beacon = NULL;
 362             point2_beacon = NULL;
 363             point3_beacon = NULL;
 364
 365             _mgr          = NULL;
 366
 367             OSG::osgExit();
 368
 369             exit(1);
 370         break;
 371         case 'w':
 372             OSG::SceneFileHandler::the()->write(_scene, "scene.osb.gz", true);
 373             printf("wrote scene.osb.gz\n");
 374         break;
 375         case '1':
 376         {
 377             if(_point1_core->getOn() == false)
 378                 _point1_core->setOn(true);
 379             else
 380                 _point1_core->setOn(false);
 381             break;
 382         }
 383
 384         case '2':
 385         {
 386             if(_point2_core->getOn() == false)
 387                 _point2_core->setOn(true);
 388             else
 389                 _point2_core->setOn(false);
 390             break;
 391         }
 392
 393         case '3':
 394         {
 395             if(_point3_core->getOn() == false)
 396                 _point3_core->setOn(true);
 397             else
 398                 _point3_core->setOn(false);
 399             break;
 400         }
 401     }
 402
 403     glutPostRedisplay();
 404 }
 405
 406 // setup the GLUT library which handles the windows for us
 407 int setupGLUT(int *argc, char *argv[])
 408 {
 409     glutInit(argc, argv);
 410     glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);
 411
 412     int winid = glutCreateWindow("OpenSG CG Shader");
 413
 414     glutReshapeFunc(reshape);
 415     glutDisplayFunc(display);
 416     glutMouseFunc(mouse);
 417     glutMotionFunc(motion);
 418     glutKeyboardFunc(keyboard);
 419
 420     return winid;
 421 }
 422
 423