Import Mesa 6.5.1 (MesaLib, MesaDemos, MesaGLUT).

1 files changed, 590 insertions, 0 deletions

diff --git a/progs/demos/reflect.c b/progs/demos/reflect.c
new file mode 100644
index 00000000000..0bec0663bc2
--- /dev/null
+++ b/progs/demos/reflect.c
@@ -0,0 +1,590 @@
+/*
+ * Demo of a reflective, texture-mapped surface with OpenGL.
+ * Brian Paul   August 14, 1995   This file is in the public domain.
+ *
+ * Hardware texture mapping is highly recommended!
+ *
+ * The basic steps are:
+ *    1. Render the reflective object (a polygon) from the normal viewpoint,
+ *       setting the stencil planes = 1.
+ *    2. Render the scene from a special viewpoint:  the viewpoint which
+ *       is on the opposite side of the reflective plane.  Only draw where
+ *       stencil = 1.  This draws the objects in the reflective surface.
+ *    3. Render the scene from the original viewpoint.  This draws the
+ *       objects in the normal fashion.  Use blending when drawing
+ *       the reflective, textured surface.
+ *
+ * This is a very crude demo.  It could be much better.
+ */
+ 
+/*
+ * Authors:
+ *   Brian Paul
+ *   Dirk Reiners ([email protected]) made some modifications to this code.
+ *   Mark Kilgard (April 1997)
+ *   Brian Paul (April 2000 - added keyboard d/s options)
+ *   Brian Paul (August 2005 - added multi window feature)
+ */
+
+
+#include <assert.h>
+#include <math.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include "GL/glut.h"
+#include "showbuffer.h"
+#include "readtex.h"
+
+
+#define DEG2RAD (3.14159/180.0)
+#define TABLE_TEXTURE "../images/tile.rgb"
+#define MAX_OBJECTS 2
+#define INIT_WIDTH 400
+#define INIT_HEIGHT 300
+
+#ifdef _WIN32
+#undef CreateWindowA
+#endif
+
+struct window {
+   int id;               /* returned by glutCreateWindow() */
+   int width, height;
+   GLboolean anim;
+   GLfloat xrot, yrot;
+   GLfloat spin;
+   GLenum showBuffer;
+   GLenum drawBuffer;
+   GLuint table_list;
+   GLuint objects_list[MAX_OBJECTS];
+   double t0;
+   struct window *next;
+};
+
+
+static struct window *FirstWindow = NULL;
+
+
+static void
+CreateWindow(void);
+
+
+static struct window *
+CurrentWindow(void)
+{
+   int id = glutGetWindow();
+   struct window *w;
+   for (w = FirstWindow; w; w = w->next) {
+      if (w->id == id)
+         return w;
+   }
+   return NULL;
+}
+
+
+static GLboolean
+AnyAnimating(void)
+{
+   struct window *w;
+   for (w = FirstWindow; w; w = w->next) {
+      if (w->anim)
+         return 1;
+   }
+   return 0;
+}
+
+
+static void
+KillWindow(struct window *w)
+{
+   struct window *win, *prev = NULL;
+   for (win = FirstWindow; win; win = win->next) {
+      if (win == w) {
+         if (prev) {
+            prev->next = win->next;
+         }
+         else {
+            FirstWindow = win->next;
+         }
+         glutDestroyWindow(win->id);
+         win->next = NULL;
+         free(win);
+         return;
+      }
+      prev = win;
+   }
+}
+
+
+static void
+KillAllWindows(void)
+{
+   while (FirstWindow)
+      KillWindow(FirstWindow);
+}
+
+
+static GLuint
+MakeTable(void)
+{
+   static GLfloat table_mat[] = { 1.0, 1.0, 1.0, 0.6 };
+   static GLfloat gray[] = { 0.4, 0.4, 0.4, 1.0 };
+   GLuint table_list;
+
+   table_list = glGenLists(1);
+   glNewList( table_list, GL_COMPILE );
+
+   /* load table's texture */
+   glMaterialfv( GL_FRONT, GL_AMBIENT_AND_DIFFUSE, table_mat );
+   /*glMaterialfv( GL_FRONT, GL_EMISSION, gray );*/
+   glMaterialfv( GL_FRONT, GL_DIFFUSE, table_mat );
+   glMaterialfv( GL_FRONT, GL_AMBIENT, gray );
+   
+   /* draw textured square for the table */
+   glPushMatrix();
+   glScalef( 4.0, 4.0, 4.0 );
+   glBegin( GL_POLYGON );
+   glNormal3f( 0.0, 1.0, 0.0 );
+   glTexCoord2f( 0.0, 0.0 );   glVertex3f( -1.0, 0.0,  1.0 );
+   glTexCoord2f( 1.0, 0.0 );   glVertex3f(  1.0, 0.0,  1.0 );
+   glTexCoord2f( 1.0, 1.0 );   glVertex3f(  1.0, 0.0, -1.0 );
+   glTexCoord2f( 0.0, 1.0 );   glVertex3f( -1.0, 0.0, -1.0 );
+   glEnd();
+   glPopMatrix();
+
+   glDisable( GL_TEXTURE_2D );
+
+   glEndList();
+   return table_list;
+}
+
+
+static void
+MakeObjects(GLuint *objects_list)
+{
+   GLUquadricObj *q;
+
+   static GLfloat cyan[] = { 0.0, 1.0, 1.0, 1.0 };
+   static GLfloat green[] = { 0.2, 1.0, 0.2, 1.0 };
+   static GLfloat black[] = { 0.0, 0.0, 0.0, 0.0 };
+
+   q = gluNewQuadric();
+   gluQuadricDrawStyle( q, GLU_FILL );
+   gluQuadricNormals( q, GLU_SMOOTH );
+
+   objects_list[0] = glGenLists(1);
+   glNewList( objects_list[0], GL_COMPILE );
+   glMaterialfv( GL_FRONT, GL_AMBIENT_AND_DIFFUSE, cyan );
+   glMaterialfv( GL_FRONT, GL_EMISSION, black );
+   gluCylinder( q, 0.5, 0.5,  1.0, 15, 1 );
+   glEndList();
+
+   objects_list[1] = glGenLists(1);
+   glNewList( objects_list[1], GL_COMPILE );
+   glMaterialfv( GL_FRONT, GL_AMBIENT_AND_DIFFUSE, green );
+   glMaterialfv( GL_FRONT, GL_EMISSION, black );
+   gluCylinder( q, 1.5, 0.0,  2.5, 15, 1 );
+   glEndList();
+
+   gluDeleteQuadric(q);
+}
+
+
+static void
+InitWindow(struct window *w)
+{
+   GLint imgWidth, imgHeight;
+   GLenum imgFormat;
+   GLubyte *image = NULL;
+
+   w->table_list = MakeTable();
+   MakeObjects(w->objects_list);
+
+   image = LoadRGBImage( TABLE_TEXTURE, &imgWidth, &imgHeight, &imgFormat );
+   if (!image) {
+      printf("Couldn't read %s\n", TABLE_TEXTURE);
+      exit(0);
+   }
+
+   gluBuild2DMipmaps(GL_TEXTURE_2D, 3, imgWidth, imgHeight,
+                     imgFormat, GL_UNSIGNED_BYTE, image);
+   free(image);
+
+   glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT );
+   glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT );
+   glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
+   glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
+
+   glShadeModel( GL_FLAT );
+   
+   glEnable( GL_LIGHT0 );
+   glEnable( GL_LIGHTING );
+
+   glClearColor( 0.5, 0.5, 0.9, 0.0 );
+
+   glEnable( GL_NORMALIZE );
+}
+
+
+static void
+Reshape(int width, int height)
+{
+   struct window *w = CurrentWindow();
+   GLfloat yAspect = 2.5;
+   GLfloat xAspect = yAspect * (float) width / (float) height;
+   w->width = width;
+   w->height = height;
+   glViewport(0, 0, width, height);
+   glMatrixMode(GL_PROJECTION);
+   glLoadIdentity();
+   glFrustum( -xAspect, xAspect, -yAspect, yAspect, 10.0, 30.0 );
+   glMatrixMode(GL_MODELVIEW);
+   glLoadIdentity();
+}
+
+
+static void
+DrawObjects(struct window *w, GLfloat eyex, GLfloat eyey, GLfloat eyez)
+{
+   (void) eyex;
+   (void) eyey;
+   (void) eyez;
+#ifndef USE_ZBUFFER
+   if (eyex<0.5) {
+#endif
+      glPushMatrix();
+      glTranslatef( 1.0, 1.5, 0.0 );
+      glRotatef( w->spin, 1.0, 0.5, 0.0 );
+      glRotatef( 0.5*w->spin, 0.0, 0.5, 1.0 );
+      glCallList( w->objects_list[0] );
+      glPopMatrix();
+      
+      glPushMatrix();
+      glTranslatef( -1.0, 0.85+3.0*fabs( cos(0.01*w->spin) ), 0.0 );
+      glRotatef( 0.5*w->spin, 0.0, 0.5, 1.0 );
+      glRotatef( w->spin, 1.0, 0.5, 0.0 );
+      glScalef( 0.5, 0.5, 0.5 );
+      glCallList( w->objects_list[1] );
+      glPopMatrix();
+#ifndef USE_ZBUFFER
+   }
+   else {	
+      glPushMatrix();
+      glTranslatef( -1.0, 0.85+3.0*fabs( cos(0.01*w->spin) ), 0.0 );
+      glRotatef( 0.5*w->spin, 0.0, 0.5, 1.0 );
+      glRotatef( w->spin, 1.0, 0.5, 0.0 );
+      glScalef( 0.5, 0.5, 0.5 );
+      glCallList( w->objects_list[1] );
+      glPopMatrix();
+
+      glPushMatrix();
+      glTranslatef( 1.0, 1.5, 0.0 );
+      glRotatef( w->spin, 1.0, 0.5, 0.0 );
+      glRotatef( 0.5*w->spin, 0.0, 0.5, 1.0 );
+      glCallList( w->objects_list[0] );
+      glPopMatrix();
+   }
+#endif
+}
+
+
+static void
+DrawTable(struct window *w)
+{
+   glCallList(w->table_list);
+}
+
+
+static void
+DrawWindow(void)
+{
+   struct window *w = CurrentWindow();
+   static GLfloat light_pos[] = { 0.0, 20.0, 0.0, 1.0 };
+   GLfloat dist = 20.0;
+   GLfloat eyex, eyey, eyez;
+
+   if (w->drawBuffer == GL_NONE) {
+      glDrawBuffer(GL_BACK);
+      glReadBuffer(GL_BACK);
+   }
+   else {
+      glDrawBuffer(w->drawBuffer);
+      glReadBuffer(w->drawBuffer);
+   }
+
+   glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
+
+   if (w->drawBuffer == GL_NONE) {
+      glDrawBuffer(GL_NONE);
+   }
+
+   eyex = dist  *  cos(w->yrot * DEG2RAD)  *  cos(w->xrot * DEG2RAD);
+   eyez = dist  *  sin(w->yrot * DEG2RAD)  *  cos(w->xrot * DEG2RAD);
+   eyey = dist  *  sin(w->xrot * DEG2RAD);
+
+   /* view from top */
+   glPushMatrix();
+   gluLookAt( eyex, eyey, eyez, 0.0, 0.0, 0.0,  0.0, 1.0, 0.0 );
+
+   glLightfv( GL_LIGHT0, GL_POSITION, light_pos );
+ 
+   /* draw table into stencil planes */
+   glDisable( GL_DEPTH_TEST );
+   glEnable( GL_STENCIL_TEST );
+   glStencilFunc( GL_ALWAYS, 1, 0xffffffff );
+   glStencilOp( GL_REPLACE, GL_REPLACE, GL_REPLACE );
+   glColorMask( GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE );
+   DrawTable(w);
+   glColorMask( GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE );
+
+   glEnable( GL_DEPTH_TEST );
+
+   /* render view from below (reflected viewport) */
+   /* only draw where stencil==1 */
+   if (eyey>0.0) {
+      glPushMatrix();
+ 
+      glStencilFunc( GL_EQUAL, 1, 0xffffffff );  /* draw if ==1 */
+      glStencilOp( GL_KEEP, GL_KEEP, GL_KEEP );
+      glScalef( 1.0, -1.0, 1.0 );
+
+      /* Reposition light in reflected space. */
+      glLightfv(GL_LIGHT0, GL_POSITION, light_pos);
+
+      DrawObjects(w, eyex, eyey, eyez);
+      glPopMatrix();
+
+      /* Restore light's original unreflected position. */
+      glLightfv(GL_LIGHT0, GL_POSITION, light_pos);
+   }
+
+   glDisable( GL_STENCIL_TEST );
+
+   glEnable( GL_BLEND );
+   glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
+
+   glEnable( GL_TEXTURE_2D );
+   DrawTable(w);
+   glDisable( GL_TEXTURE_2D );
+   glDisable( GL_BLEND );
+
+   /* view from top */
+   glPushMatrix();
+
+   DrawObjects(w, eyex, eyey, eyez);
+
+   glPopMatrix();
+
+   glPopMatrix();
+
+   if (w->showBuffer == GL_DEPTH) {
+      ShowDepthBuffer(w->width, w->height, 1.0, 0.0);
+   }
+   else if (w->showBuffer == GL_STENCIL) {
+      ShowStencilBuffer(w->width, w->height, 255.0, 0.0);
+   }
+   else if (w->showBuffer == GL_ALPHA) {
+      ShowAlphaBuffer(w->width, w->height);
+   }
+
+   if (w->drawBuffer == GL_FRONT)
+      glFinish();
+   else
+      glutSwapBuffers();
+
+   /* calc/show frame rate */
+   {
+      static GLint t0 = 0;
+      static GLint frames = 0;
+      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
+Idle(void)
+{
+   double t = glutGet(GLUT_ELAPSED_TIME) / 1000.0;
+   struct window *w;
+   for (w = FirstWindow; w; w = w->next) {
+      if (w->anim) {
+         double dt;
+         if (w->t0 < 0.0)
+            w->t0 = t;
+         dt = t - w->t0;
+         w->t0 = t;
+         w->spin += 60.0 * dt;
+         w->yrot += 90.0 * dt;
+         assert(w->id);
+         glutSetWindow(w->id);
+         glutPostRedisplay();
+      }
+   }
+}
+
+
+static void
+UpdateIdleFunc(void)
+{
+   if (AnyAnimating())
+      glutIdleFunc(Idle);
+   else
+      glutIdleFunc(NULL);
+}
+
+static void
+Key(unsigned char key, int x, int y)
+{
+   struct window *w = CurrentWindow();
+   (void) x;
+   (void) y;
+
+   switch (key) {
+   case 'd':
+      w->showBuffer = GL_DEPTH;
+      glutPostRedisplay();
+      break;
+   case 's':
+      w->showBuffer = GL_STENCIL;
+      glutPostRedisplay();
+      break;
+   case 'a':
+      w->showBuffer = GL_ALPHA;
+      glutPostRedisplay();
+      break;
+   case 'c':
+      w->showBuffer = GL_NONE;
+      glutPostRedisplay();
+      break;
+   case 'f':
+      if (w->drawBuffer == GL_FRONT)
+         w->drawBuffer = GL_BACK;
+      else
+         w->drawBuffer = GL_FRONT;
+      glutPostRedisplay();
+      break;
+   case '0':
+      w->drawBuffer = GL_NONE;
+      glutPostRedisplay();
+      break;
+   case ' ':
+      w->anim = !w->anim;
+      w->t0 = -1;
+      UpdateIdleFunc();
+      glutPostRedisplay();
+      break;
+   case 'n':
+      CreateWindow();
+      UpdateIdleFunc();
+      break;
+   case 'k':
+      KillWindow(w);
+      if (FirstWindow == NULL)
+         exit(0);
+      break;
+   case 27:
+      KillAllWindows();
+      exit(0);
+      break;
+   default:
+      ;
+   }
+}
+
+
+static void
+SpecialKey(int key, int x, int y)
+{
+   struct window *w = CurrentWindow();
+   (void) x;
+   (void) y;
+   switch (key) {
+      case GLUT_KEY_UP:
+         w->xrot += 3.0;
+         if (w->xrot > 85)
+            w->xrot = 85;
+         break;
+      case GLUT_KEY_DOWN:
+         w->xrot -= 3.0;
+         if (w->xrot < 5)
+            w->xrot = 5;
+         break;
+      case GLUT_KEY_LEFT:
+         w->yrot += 3.0;
+         break;
+      case GLUT_KEY_RIGHT:
+         w->yrot -= 3.0;
+         break;
+   }
+   glutPostRedisplay();
+}
+
+
+static void
+CreateWindow(void)
+{
+   char title[1000];
+   struct window *w = (struct window *) calloc(1, sizeof(struct window));
+   
+   glutInitWindowSize(INIT_WIDTH, INIT_HEIGHT);
+   w->id = glutCreateWindow("foo");
+   sprintf(title, "reflect window %d", w->id);
+   glutSetWindowTitle(title);
+   assert(w->id);
+   w->width = INIT_WIDTH;
+   w->height = INIT_HEIGHT;
+   w->anim = GL_TRUE;
+   w->xrot = 30.0;
+   w->yrot = 50.0;
+   w->spin = 0.0;
+   w->showBuffer = GL_NONE;
+   w->drawBuffer = GL_BACK;
+
+   InitWindow(w);
+
+   glutReshapeFunc(Reshape);
+   glutDisplayFunc(DrawWindow);
+   glutKeyboardFunc(Key);
+   glutSpecialFunc(SpecialKey);
+
+   /* insert at head of list */
+   w->next = FirstWindow;
+   FirstWindow = w;
+}
+
+
+static void
+Usage(void)
+{
+   printf("Keys:\n");
+   printf("  a      - show alpha buffer\n");
+   printf("  d      - show depth buffer\n");
+   printf("  s      - show stencil buffer\n");
+   printf("  c      - show color buffer\n");
+   printf("  f      - toggle rendering to front/back color buffer\n");
+   printf("  n      - create new window\n");
+   printf("  k      - kill window\n");
+   printf("  SPACE  - toggle animation\n");
+   printf("  ARROWS - rotate scene\n");
+}
+
+
+int
+main(int argc, char *argv[])
+{
+   glutInit(&argc, argv);
+   glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH |
+                       GLUT_STENCIL | GLUT_ALPHA);
+   CreateWindow();
+   glutIdleFunc(Idle);
+   Usage();
+   glutMainLoop();
+   return 0;
+}