(no commit message)

diff --git a/scene.c b/scene.c
index 34824a4..6c9540a 100644 (file)
--- a/scene.c
+++ b/scene.c
@@ -527,6 +527,11 @@ drawFloor(void)
 }\r
 \r
 \r
+static GLfloat lightColor[] = {0.8, 1.0, 0.8, 1.0}; /* green-tinted */\r
+static GLfloat lightPosition[4];\r
+static float lightAngle = 0.0, lightHeight = 20;\r
+\r
+\r
 /**\r
  * Display function\r
  */\r
@@ -553,6 +558,47 @@ void display() {
 \r
    glMatrixMode(GL_PROJECTION);\r
   glLoadIdentity();*/\r
+\r
+\r
+   /* Reposition the light source. */\r
+  lightPosition[0] = 12*cos(lightAngle);\r
+  lightPosition[1] = lightHeight;\r
+  lightPosition[2] = 12*sin(lightAngle);\r
+  //if (directionalLight) {\r
+    lightPosition[3] = 0.0;\r
+  //} else {\r
+  //  lightPosition[3] = 1.0;\r
+  //}\r
+\r
+    glPushMatrix();\r
+\r
+    /* Tell GL new light source position. */\r
+    glLightfv(GL_LIGHT0, GL_POSITION, lightPosition);\r
+\r
+       /* Draw "bottom" of floor in blue. */\r
+    glFrontFace(GL_CW);  /* Switch face orientation. */\r
+    glColor4f(0.1, 0.1, 0.7, 1.0);\r
+    drawFloor();\r
+    glFrontFace(GL_CCW);\r
+\r
+        /* Draw "top" of floor.  Use blending to blend in reflection. */\r
+    glEnable(GL_BLEND);\r
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);\r
+    glColor4f(0.7, 0.0, 0.0, 0.3);\r
+    glColor4f(1.0, 1.0, 1.0, 0.3);\r
+    drawFloor();\r
+    glDisable(GL_BLEND);\r
+\r
+        glPushMatrix();\r
+    glDisable(GL_LIGHTING);\r
+\r
+     /* Draw a yellow ball at the light source. */\r
+      glTranslatef(lightPosition[0], lightPosition[1], lightPosition[2]);\r
+      glutSolidSphere(1.0, 5, 5);\r
+\r
+          glEnable(GL_LIGHTING);\r
+    glPopMatrix();\r
+\r
    drawFloor();\r
    glutSwapBuffers();\r
 }\r
@@ -567,6 +613,7 @@ void init() {
   glMatrixMode(GL_MODELVIEW);\r
 }\r
 \r
+\r
 /**\r
  * Main function\r
  * @param argc Number of arguments\r
@@ -617,5 +664,12 @@ int main(int argc, char **argv) {
     0.0, 8.0, 0.0,      /* center is at (0,8,0) */\r
     0.0, 1.0, 0.);      /* up is in postivie Y direction */\r
 \r
+    glLightModeli(GL_LIGHT_MODEL_LOCAL_VIEWER, 1);\r
+  glLightfv(GL_LIGHT0, GL_DIFFUSE, lightColor);\r
+  glLightf(GL_LIGHT0, GL_CONSTANT_ATTENUATION, 0.1);\r
+  glLightf(GL_LIGHT0, GL_LINEAR_ATTENUATION, 0.05);\r
+  glEnable(GL_LIGHT0);\r
+  glEnable(GL_LIGHTING);\r
+\r
     glutMainLoop();\r
 }\r