X-Git-Url: https://git.ucc.asn.au/?a=blobdiff_plain;f=scene.c;h=b869afa1fa1aa7ae0496c3eb3433cb7252e344c3;hb=0b72379322375642f7d4376d491ae295b8d6fdd9;hp=26d0d421350f558cbfaca65006a19e33f6efe8fb;hpb=be28556c4dcf730dee7a2bdf6538bd7fef5bc313;p=atyndall%2Fcits2231.git

diff --git a/scene.c b/scene.c
index 26d0d42..b869afa 100644
--- a/scene.c
+++ b/scene.c
@@ -491,28 +491,116 @@ void mouse(int btn, int state, int x, int y) {
   
 }
 
+static GLfloat floorVertices[4][3] = {
+  { -20.0, 0.0, 20.0 },
+  { 20.0, 0.0, 20.0 },
+  { 20.0, 0.0, -20.0 },
+  { -20.0, 0.0, -20.0 },
+};
+
+/* Draw a floor (possibly textured). */
+static void
+drawFloor(void)
+{
+  glDisable(GL_LIGHTING);
+
+  //if (useTexture) {
+  //  glEnable(GL_TEXTURE_2D);
+  //}
+
+  glBegin(GL_QUADS);
+    glTexCoord2f(0.0, 0.0);
+    glVertex3fv(floorVertices[0]);
+    glTexCoord2f(0.0, 16.0);
+    glVertex3fv(floorVertices[1]);
+    glTexCoord2f(16.0, 16.0);
+    glVertex3fv(floorVertices[2]);
+    glTexCoord2f(16.0, 0.0);
+    glVertex3fv(floorVertices[3]);
+  glEnd();
+
+  /*if (useTexture) {
+    glDisable(GL_TEXTURE_2D);
+  }*/
+
+  glEnable(GL_LIGHTING);
+}
+
+
+static GLfloat lightColor[] = {1.0, 1.0, 1.0, 1.0}; /* green-tinted */
+static GLfloat lightPosition[4];
+static float lightAngle = 0.0, lightHeight = 20;
+
+
 /**
  * Display function
  */
 void display() {
-   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-   glLoadIdentity();
+  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+  glLoadIdentity();
+
+  /* Reposition the light source. */
+  lightPosition[0] = 12*cos(lightAngle);
+  lightPosition[1] = lightHeight;
+  lightPosition[2] = 12*sin(lightAngle);
+  lightPosition[3] = 0.0;
 
-   glTranslatef( 0.0f,  0.0f,  0.0f);
-   glBegin(GL_QUADS);
-     glVertex3f( 0.0f,  1.0f, -1.0f);
-     glVertex3f( 0.0f,  1.0f,  1.0f);
-     glVertex3f( 0.0f, -1.0f,  1.0f);
-     glVertex3f( 0.0f, -1.0f, -1.0f);
-   glEnd();
+  glPushMatrix();
+    glLightfv(GL_LIGHT0, GL_POSITION, lightPosition);
 
+    glEnable(GL_BLEND);
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+    drawFloor();
+    glDisable(GL_BLEND);
 
-   glTranslatef( 0.0f, 0.0f, -5.0f); // Move into the Screen 10.0
-   glutSolidTeapot(1);
+    glutSolidTeapot(1); // Draw teapot for test
 
-   gluLookAt(1.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f);
+    glPushMatrix();
+      glDisable(GL_LIGHTING);
+      glColor3f(1.0, 1.0, 0.0);
 
-   glutSwapBuffers();
+      /* Draw a yellow ball at the light source. */
+      glTranslatef(lightPosition[0], lightPosition[1], lightPosition[2]);
+      glutSolidSphere(1.0, 5, 5);
+
+      glEnable(GL_LIGHTING);
+    glPopMatrix();
+
+  glPopMatrix();
+
+  glutSwapBuffers();
+}
+
+/**
+ * init function; sets initial OpenGL state
+ */
+void init() {
+  glEnable(GL_CULL_FACE);
+  glEnable(GL_DEPTH_TEST);
+  glEnable(GL_TEXTURE_2D);
+  glLineWidth(3.0);
+
+  glMatrixMode(GL_PROJECTION);
+  gluPerspective(
+     40.0,  /* field of view in degree */ 
+      1.0,  /* aspect ratio */ 
+     20.0,  /* Z near */
+    100.0   /* Z far */ 
+    );
+  
+  glMatrixMode(GL_MODELVIEW);
+  gluLookAt(
+    0.0, 8.0, 60.0,  /* eye is at (0,8,60) */
+    0.0, 8.0,  0.0,  /* center is at (0,8,0) */
+    0.0, 1.0,  0.0   /* up is in postivie Y direction */
+    );      
+
+  glLightModeli(GL_LIGHT_MODEL_LOCAL_VIEWER, 1);
+  glLightfv(GL_LIGHT0, GL_DIFFUSE, lightColor);
+  glLightf(GL_LIGHT0, GL_CONSTANT_ATTENUATION, 0.1);
+  glLightf(GL_LIGHT0, GL_LINEAR_ATTENUATION, 0.05);
+  glEnable(GL_LIGHT0);
+  glEnable(GL_LIGHTING);
 }
 
 /**
@@ -522,42 +610,39 @@ void display() {
  * @return Program exit code
  */
 int main(int argc, char **argv) {
+  if(argc>1)
+    strcpy(dataDir, argv[1]);
+  else if(opendir(dirDefault1))
+    strcpy(dataDir, dirDefault1);
+  else if(opendir(dirDefault2))
+    strcpy(dataDir, dirDefault2);
+  else fileErr(dirDefault1);
 
-    if(argc>1)
-	  strcpy(dataDir, argv[1]);
-    else if(opendir(dirDefault1))
-	  strcpy(dataDir, dirDefault1);
-    else if(opendir(dirDefault2))
-      strcpy(dataDir, dirDefault2);
-    else fileErr(dirDefault1);
+  for(int i=0; i<NMESH; i++) meshes[i]=NULL;
+  for(int i=0; i<NTEXTURE; i++) textures[i]=NULL;
 
-    for(int i=0; i<NMESH; i++) meshes[i]=NULL;
-    for(int i=0; i<NTEXTURE; i++) textures[i]=NULL;
+  glutInit(&argc, argv);
 
-    glutInit(&argc, argv);
+  glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
 
-    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
-    glutInitWindowSize(500, 500);
-    glutCreateWindow("Scene Editor");
+  glutInitWindowSize(500, 500);
+  glutCreateWindow("Scene Editor");
 
-    glShadeModel(GL_SMOOTH); // Enables Smooth Shading
-    glClearColor(0.0f, 0.0f, 0.0f, 0.0f); // Black Background
-    glClearDepth(1.0f); // Depth Buffer Setup
-    glEnable(GL_DEPTH_TEST); // Enables Depth Testing
-    glDepthFunc(GL_LEQUAL);  // the type
+  glShadeModel(GL_SMOOTH); // Enables Smooth Shading
+  glClearColor(0.0f, 0.0f, 0.0f, 0.0f); // Black Background
+  glClearDepth(1.0f); // Depth Buffer Setup
+  glEnable(GL_DEPTH_TEST); // Enables Depth Testing
+  glDepthFunc(GL_LEQUAL);  // the type
 
-    glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);          // Really Nice Perspective Calculations
+  glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);          // Really Nice Perspective Calculations
 
-    glutReshapeFunc(windowReshape);
-    glutDisplayFunc(display);
-    glutMouseFunc(mouse);
+  glutReshapeFunc(windowReshape);
+  glutDisplayFunc(display);
+  glutMouseFunc(mouse);
 
-    makeMenu();
+  makeMenu();
 
-    glMatrixMode(GL_PROJECTION);
-    glLoadIdentity();
-    gluPerspective( 60, 1, 0.1, 1000.0);
-    glMatrixMode(GL_MODELVIEW);
+  init();
 
-    glutMainLoop();
+  glutMainLoop();
 }