initial check-in

1 files changed, 246 insertions, 0 deletions

diff --git a/progs/demos/cubemap.c b/progs/demos/cubemap.c
new file mode 100644
index 0000000000..620a2d6533
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+++ b/progs/demos/cubemap.c
@@ -0,0 +1,246 @@
+/* $Id: cubemap.c,v 1.1 2000/05/30 01:18:29 brianp Exp $ */
+
+/*
+ * GL_ARB_texture_cube_map demo
+ *
+ * Brian Paul
+ * May 2000
+ *
+ *
+ * Copyright (C) 2000  Brian Paul   All Rights Reserved.
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+
+/*
+ * This is a pretty minimalistic demo for now.  Eventually, use some
+ * interesting cube map textures and 3D objects.
+ * For now, we use 6 checkerboard "walls" and a sphere (good for
+ * verification purposes).
+ */
+
+
+#include <math.h>
+#include <stdlib.h>
+#include <string.h>
+#include "GL/glut.h"
+
+static GLfloat Xrot = 0, Yrot = 0;
+
+
+static void draw( void )
+{
+   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+   glMatrixMode(GL_TEXTURE);
+   glLoadIdentity();
+   glRotatef(Xrot, 1, 0, 0);
+   glRotatef(Yrot, 0, 1, 0);
+   glutSolidSphere(2.0, 20, 20);
+   glMatrixMode(GL_MODELVIEW);
+
+   glutSwapBuffers();
+}
+
+
+static void idle(void)
+{
+   Yrot += 5.0;
+   glutPostRedisplay();
+}
+
+
+static void set_mode(GLuint mode)
+{
+   if (mode == 0) {
+      glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_REFLECTION_MAP_ARB);
+      glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_REFLECTION_MAP_ARB);
+      glTexGeni(GL_R, GL_TEXTURE_GEN_MODE, GL_REFLECTION_MAP_ARB);
+      printf("GL_REFLECTION_MAP_ARB mode\n");
+   }
+   else if (mode == 1) {
+      glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_NORMAL_MAP_ARB);
+      glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_NORMAL_MAP_ARB);
+      glTexGeni(GL_R, GL_TEXTURE_GEN_MODE, GL_NORMAL_MAP_ARB);
+      printf("GL_NORMAL_MAP_ARB mode\n");
+   }
+   glEnable(GL_TEXTURE_GEN_S);
+   glEnable(GL_TEXTURE_GEN_T);
+   glEnable(GL_TEXTURE_GEN_R);
+}
+
+
+static void key(unsigned char k, int x, int y)
+{
+   static GLboolean anim = GL_TRUE;
+   static GLuint mode = 0;
+   (void) x;
+   (void) y;
+   switch (k) {
+      case ' ':
+         anim = !anim;
+         if (anim)
+            glutIdleFunc(idle);
+         else
+            glutIdleFunc(NULL);
+         break;
+      case 'm':
+         mode = !mode;
+         set_mode(mode);
+         break;
+      case 27:
+         exit(0);
+   }
+   glutPostRedisplay();
+}
+
+
+static void specialkey(int key, int x, int y)
+{
+   GLfloat step = 10;
+   (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();
+}
+
+
+/* new window size or exposure */
+static void reshape(int width, int height)
+{
+   glViewport(0, 0, (GLint)width, (GLint)height);
+   glMatrixMode(GL_PROJECTION);
+   glLoadIdentity();
+   glFrustum( -2.0, 2.0, -2.0, 2.0, 6.0, 20.0 );
+   glMatrixMode(GL_MODELVIEW);
+   glLoadIdentity();
+   glTranslatef( 0.0, 0.0, -8.0 );
+}
+
+
+static void init( void )
+{
+#define CUBE_TEX_SIZE 64
+   GLubyte image[CUBE_TEX_SIZE][CUBE_TEX_SIZE][3];
+   static const GLubyte colors[6][3] = {
+      { 255,   0,   0 },
+      {   0, 255, 255 },
+      {   0, 255,   0 },
+      { 255,   0, 255 },
+      {   0,   0, 255 },
+      { 255, 255,   0 }
+   };
+   static const GLenum targets[6] = {
+      GL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB,
+      GL_TEXTURE_CUBE_MAP_NEGATIVE_X_ARB,
+      GL_TEXTURE_CUBE_MAP_POSITIVE_Y_ARB,
+      GL_TEXTURE_CUBE_MAP_NEGATIVE_Y_ARB,
+      GL_TEXTURE_CUBE_MAP_POSITIVE_Z_ARB,
+      GL_TEXTURE_CUBE_MAP_NEGATIVE_Z_ARB
+   };
+
+   GLint i, j, f;
+
+   /* check for extension */
+   {
+      char *exten = (char *) glGetString(GL_EXTENSIONS);
+      if (!strstr(exten, "GL_ARB_texture_cube_map")) {
+         printf("Sorry, this demo requires GL_ARB_texture_cube_map\n");
+         exit(0);
+      }
+   }
+
+
+   glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+
+   /* make colored checkerboard cube faces */
+   for (f = 0; f < 6; f++) {
+      for (i = 0; i < CUBE_TEX_SIZE; i++) {
+         for (j = 0; j < CUBE_TEX_SIZE; j++) {
+            if ((i/4 + j/4) & 1) {
+               image[i][j][0] = colors[f][0];
+               image[i][j][1] = colors[f][1];
+               image[i][j][2] = colors[f][2];
+            }
+            else {
+               image[i][j][0] = 255;
+               image[i][j][1] = 255;
+               image[i][j][2] = 255;
+            }
+         }
+      }
+
+      glTexImage2D(targets[f], 0, GL_RGB, CUBE_TEX_SIZE, CUBE_TEX_SIZE, 0,
+                   GL_RGB, GL_UNSIGNED_BYTE, image);
+   }
+
+   /*
+   glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+   glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+   */
+   glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+   glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+
+   glEnable(GL_TEXTURE_CUBE_MAP_ARB);
+
+   glClearColor(.3, .3, .3, 0);
+   glColor3f( 1.0, 1.0, 1.0 );
+
+   set_mode(0);
+}
+
+
+static void usage(void)
+{
+   printf("keys:\n");
+   printf("  SPACE - toggle animation\n");
+   printf("  CURSOR KEYS - rotation\n");
+   printf("  m - toggle texgen reflection mode\n");
+}
+
+
+int main( int argc, char *argv[] )
+{
+   glutInitWindowPosition(0, 0);
+   glutInitWindowSize(300, 300);
+   glutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE );
+   glutCreateWindow("Texture Cube Maping");
+   init();
+   glutReshapeFunc( reshape );
+   glutKeyboardFunc( key );
+   glutSpecialFunc( specialkey );
+   glutIdleFunc( idle );
+   glutDisplayFunc( draw );
+   usage();
+   glutMainLoop();
+   return 0;
+}