initial rev

1 files changed, 358 insertions, 0 deletions

diff --git a/progs/demos/gloss.c b/progs/demos/gloss.c
new file mode 100644
index 0000000000..5de3647d62
--- /dev/null
+++ b/progs/demos/gloss.c
@@ -0,0 +1,358 @@
+/* $Id: gloss.c,v 1.1 1999/10/22 20:34:57 brianp Exp $ */
+
+/*
+ * Specular reflection demo.  The specular hightlight is modulated by
+ * a sphere-mapped texture.  The result is a high-gloss surface.
+ * NOTE: you really need hardware acceleration for this.
+ *
+ * Command line options:
+ *    -info      print GL implementation information
+ *
+ *
+ * Brian Paul  October 22, 1999  This program is in the public domain.
+ */
+
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <GL/glut.h>
+
+#include "../util/readtex.c"   /* I know, this is a hack. */
+
+#define SPECULAR_TEXTURE_FILE "../images/reflect.rgb"
+#define BASE_TEXTURE_FILE "../images/tile.rgb"
+
+/* Menu items */
+#define DO_SPEC_TEXTURE 1
+#define OBJECT 2
+#define ANIMATE 3
+#define QUIT 100
+
+static GLuint CylinderObj = 0;
+static GLuint TeapotObj = 0;
+static GLuint Object = 0;
+static GLboolean Animate = GL_TRUE;
+
+static GLfloat Xrot = 0.0, Yrot = 0.0, Zrot = 0.0;
+static GLfloat DXrot = 1.0, DYrot = 2.5;
+
+static GLfloat Black[4] = { 0, 0, 0, 0 };
+static GLfloat White[4] = { 1, 1, 1, 1 };
+static GLfloat Diffuse[4] = { .3, .3, 1.0, 1.0 };  /* blue */
+static GLfloat Shininess = 15;
+
+static GLuint BaseTexture, SpecularTexture;
+static GLboolean DoSpecTexture = GL_TRUE;
+
+/* performance info */
+static GLint T0 = 0;
+static GLint Frames = 0;
+
+
+
+
+static void Idle( void )
+{
+   if (Animate) {
+      Xrot += DXrot;
+      Yrot += DYrot;
+      glutPostRedisplay();
+   }
+}
+
+
+static void Display( void )
+{
+   glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
+
+   glPushMatrix();
+   glRotatef(Xrot, 1.0, 0.0, 0.0);
+   glRotatef(Yrot, 0.0, 1.0, 0.0);
+   glRotatef(Zrot, 0.0, 0.0, 1.0);
+
+   /* First pass: diffuse lighting with base texture */
+   glMaterialfv(GL_FRONT, GL_DIFFUSE, Diffuse);
+   glMaterialfv(GL_FRONT, GL_SPECULAR, Black);
+   glEnable(GL_TEXTURE_2D);
+   glBindTexture(GL_TEXTURE_2D, BaseTexture);
+   glMatrixMode(GL_TEXTURE);
+   glLoadIdentity();
+   glScalef(2.0, 2.0, 2.0);
+   glMatrixMode(GL_MODELVIEW);
+   glCallList(Object);
+   glMatrixMode(GL_TEXTURE);
+   glLoadIdentity();
+   glMatrixMode(GL_MODELVIEW);
+
+   /* Second pass: specular lighting with reflection texture */
+   glBlendFunc(GL_ONE, GL_ONE);  /* add */
+   glEnable(GL_BLEND);
+   glDepthFunc(GL_LEQUAL);
+   glMaterialfv(GL_FRONT, GL_DIFFUSE, Black);
+   glMaterialfv(GL_FRONT, GL_SPECULAR, White);
+   if (DoSpecTexture) {
+      glBindTexture(GL_TEXTURE_2D, SpecularTexture);
+      glEnable(GL_TEXTURE_GEN_S);
+      glEnable(GL_TEXTURE_GEN_T);
+   }
+   else {
+      glDisable(GL_TEXTURE_2D);
+   }
+   glCallList(Object);
+   glDisable(GL_TEXTURE_GEN_S);
+   glDisable(GL_TEXTURE_GEN_T);
+   glDisable(GL_BLEND);
+   glDepthFunc(GL_LESS);
+
+   glPopMatrix();
+
+   glutSwapBuffers();
+
+   if (Animate) {
+      GLint t = glutGet(GLUT_ELAPSED_TIME);
+      Frames++;
+      if (t - T0 >= 5000) {
+         GLfloat seconds = (t - T0) / 1000.0;
+         GLfloat fps = Frames / seconds;
+         printf("%d frames in %g seconds = %g FPS\n", Frames, seconds, fps);
+         T0 = t;
+         Frames = 0;
+      }
+   }
+}
+
+
+static void Reshape( int width, int height )
+{
+   GLfloat h = 30.0;
+   GLfloat w = h * width / height;
+   glViewport( 0, 0, width, height );
+   glMatrixMode( GL_PROJECTION );
+   glLoadIdentity();
+   glFrustum( -w, w, -h, h, 150.0, 500.0 );
+   glMatrixMode( GL_MODELVIEW );
+   glLoadIdentity();
+   glTranslatef( 0.0, 0.0, -380.0 );
+}
+
+
+static void ToggleAnimate(void)
+{
+   Animate = !Animate;
+   if (Animate) {
+      glutIdleFunc( Idle );
+      T0 = glutGet(GLUT_ELAPSED_TIME);
+      Frames = 0;
+   }
+   else {
+      glutIdleFunc( NULL );
+   }
+}
+
+
+static void ModeMenu(int entry)
+{
+   if (entry==ANIMATE) {
+      ToggleAnimate();
+   }
+   else if (entry==DO_SPEC_TEXTURE) {
+      DoSpecTexture = !DoSpecTexture;
+   }
+   else if (entry==OBJECT) {
+      if (Object == TeapotObj)
+         Object = CylinderObj;
+      else
+         Object = TeapotObj;
+   }
+   else if (entry==QUIT) {
+      exit(0);
+   }
+   glutPostRedisplay();
+}
+
+
+static void Key( unsigned char key, int x, int y )
+{
+   (void) x;
+   (void) y;
+   switch (key) {
+      case 's':
+         Shininess--;
+         if (Shininess < 0.0)
+            Shininess = 0.0;
+         glMaterialf(GL_FRONT, GL_SHININESS, Shininess);
+         printf("Shininess = %g\n", Shininess);
+         break;
+      case 'S':
+         Shininess++;
+         if (Shininess > 128.0)
+            Shininess = 128.0;
+         glMaterialf(GL_FRONT, GL_SHININESS, Shininess);
+         printf("Shininess = %g\n", Shininess);
+         break;
+      case ' ':
+         ToggleAnimate();
+         break;
+      case 27:
+         exit(0);
+         break;
+   }
+   glutPostRedisplay();
+}
+
+
+static void SpecialKey( int key, int x, int y )
+{
+   float step = 3.0;
+   (void) x;
+   (void) y;
+
+   switch (key) {
+      case GLUT_KEY_UP:
+         Xrot += step;
+         break;
+      case GLUT_KEY_DOWN:
+         Xrot -= step;
+         break;
+      case GLUT_KEY_LEFT:
+         Yrot += step;
+         break;
+      case GLUT_KEY_RIGHT:
+         Yrot -= step;
+         break;
+   }
+   glutPostRedisplay();
+}
+
+
+static void Init( int argc, char *argv[] )
+{
+   /* Cylinder object */
+   {
+      static GLfloat height = 100.0;
+      static GLfloat radius = 40.0;
+      GLUquadricObj *q = gluNewQuadric();
+      assert(q);
+      gluQuadricTexture(q, GL_TRUE);
+
+      CylinderObj = glGenLists(1);
+      glNewList(CylinderObj, GL_COMPILE);
+
+      glPushMatrix();
+      glTranslatef(0.0, 0.0, -0.5 * height);
+
+      /* cylinder */
+      gluQuadricNormals(q, GL_SMOOTH);
+      gluQuadricTexture(q, GL_TRUE);
+      gluCylinder(q, radius, radius, height, 24, 10);
+
+      /* end cap */
+      glTranslatef(0.0, 0.0, height);
+      gluDisk(q, 0.0, radius, 24, 1);
+
+      /* other end cap */
+      glTranslatef(0.0, 0.0, -height);
+      gluQuadricOrientation(q, GLU_INSIDE);
+      gluDisk(q, 0.0, radius, 24, 1);
+
+      glPopMatrix();
+      glEndList();
+      gluDeleteQuadric(q);
+   }
+
+   /* Teapot */
+   {
+      TeapotObj = glGenLists(1);
+      glNewList(TeapotObj, GL_COMPILE);
+
+      glFrontFace(GL_CW);
+      glutSolidTeapot(40.0);
+      glFrontFace(GL_CCW);
+
+      glEndList();
+   }
+
+   /* show cylinder by default */
+   Object = CylinderObj;
+
+
+   /* lighting */
+   glEnable(GL_LIGHTING);
+   {
+      GLfloat pos[4] = { 3, 3, 3, 1 };
+      glLightfv(GL_LIGHT0, GL_AMBIENT, Black);
+      glLightfv(GL_LIGHT0, GL_DIFFUSE, White);
+      glLightfv(GL_LIGHT0, GL_SPECULAR, White);
+      glLightfv(GL_LIGHT0, GL_POSITION, pos);
+      glEnable(GL_LIGHT0);
+      glMaterialfv(GL_FRONT, GL_AMBIENT, Black);
+      glMaterialf(GL_FRONT, GL_SHININESS, Shininess);
+      glLightModeli(GL_LIGHT_MODEL_LOCAL_VIEWER, 1);
+   }
+
+   /* Base texture */
+   glGenTextures(1, &BaseTexture);
+   glBindTexture(GL_TEXTURE_2D, BaseTexture);
+   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+   if (!LoadRGBMipmaps(BASE_TEXTURE_FILE, GL_RGB)) {
+      printf("Error: couldn't load texture image file %s\n", BASE_TEXTURE_FILE);
+      exit(1);
+   }
+
+   /* Specular texture */
+   glGenTextures(1, &SpecularTexture);
+   glBindTexture(GL_TEXTURE_2D, SpecularTexture);
+   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+   glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
+   glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
+   if (!LoadRGBMipmaps(SPECULAR_TEXTURE_FILE, GL_RGB)) {
+      printf("Error: couldn't load texture image file %s\n", SPECULAR_TEXTURE_FILE);
+      exit(1);
+   }
+
+   /* misc */
+   glEnable(GL_CULL_FACE);
+   glEnable(GL_TEXTURE_2D);
+   glEnable(GL_DEPTH_TEST);
+   glEnable(GL_NORMALIZE);
+
+   if (argc > 1 && strcmp(argv[1], "-info")==0) {
+      printf("GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
+      printf("GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
+      printf("GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
+      printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS));
+   }
+}
+
+
+int main( int argc, char *argv[] )
+{
+   glutInit( &argc, argv );
+   glutInitWindowSize( 500, 500 );
+
+   glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH );
+
+   glutCreateWindow(argv[0] );
+
+   Init(argc, argv);
+
+   glutReshapeFunc( Reshape );
+   glutKeyboardFunc( Key );
+   glutSpecialFunc( SpecialKey );
+   glutDisplayFunc( Display );
+   glutIdleFunc( Idle );
+
+   glutCreateMenu(ModeMenu);
+   glutAddMenuEntry("Toggle Highlight", DO_SPEC_TEXTURE);
+   glutAddMenuEntry("Toggle Object", OBJECT);
+   glutAddMenuEntry("Toggle Animate", ANIMATE);
+   glutAddMenuEntry("Quit", QUIT);
+   glutAttachMenu(GLUT_RIGHT_BUTTON);
+
+   glutMainLoop();
+   return 0;
+}