251 lines
6.4 KiB
C
251 lines
6.4 KiB
C
/* $Id: cubemap.c,v 1.3 2000/06/27 17:04:43 brianp Exp $ */
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/*
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* GL_ARB_texture_cube_map demo
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*
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* Brian Paul
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* May 2000
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*
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*
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* Copyright (C) 2000 Brian Paul All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* This is a pretty minimalistic demo for now. Eventually, use some
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* interesting cube map textures and 3D objects.
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* For now, we use 6 checkerboard "walls" and a sphere (good for
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* verification purposes).
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*/
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#include <math.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "GL/glut.h"
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static GLfloat Xrot = 0, Yrot = 0;
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static void draw( void )
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{
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glMatrixMode(GL_TEXTURE);
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glLoadIdentity();
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glRotatef(Xrot, 1, 0, 0);
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glRotatef(Yrot, 0, 1, 0);
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glutSolidSphere(2.0, 20, 20);
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glMatrixMode(GL_MODELVIEW);
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glutSwapBuffers();
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}
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static void idle(void)
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{
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Yrot += 5.0;
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glutPostRedisplay();
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}
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static void set_mode(GLuint mode)
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{
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if (mode == 0) {
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glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_REFLECTION_MAP_ARB);
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glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_REFLECTION_MAP_ARB);
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glTexGeni(GL_R, GL_TEXTURE_GEN_MODE, GL_REFLECTION_MAP_ARB);
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printf("GL_REFLECTION_MAP_ARB mode\n");
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}
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else if (mode == 1) {
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glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_NORMAL_MAP_ARB);
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glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_NORMAL_MAP_ARB);
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glTexGeni(GL_R, GL_TEXTURE_GEN_MODE, GL_NORMAL_MAP_ARB);
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printf("GL_NORMAL_MAP_ARB mode\n");
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}
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glEnable(GL_TEXTURE_GEN_S);
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glEnable(GL_TEXTURE_GEN_T);
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glEnable(GL_TEXTURE_GEN_R);
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}
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static void key(unsigned char k, int x, int y)
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{
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static GLboolean anim = GL_TRUE;
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static GLuint mode = 0;
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(void) x;
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(void) y;
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switch (k) {
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case ' ':
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anim = !anim;
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if (anim)
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glutIdleFunc(idle);
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else
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glutIdleFunc(NULL);
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break;
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case 'm':
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mode = !mode;
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set_mode(mode);
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break;
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case 27:
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exit(0);
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}
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glutPostRedisplay();
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}
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static void specialkey(int key, int x, int y)
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{
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GLfloat step = 10;
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(void) x;
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(void) y;
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switch (key) {
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case GLUT_KEY_UP:
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Xrot -= step;
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break;
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case GLUT_KEY_DOWN:
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Xrot += step;
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break;
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case GLUT_KEY_LEFT:
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Yrot -= step;
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break;
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case GLUT_KEY_RIGHT:
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Yrot += step;
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break;
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}
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glutPostRedisplay();
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}
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/* new window size or exposure */
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static void reshape(int width, int height)
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{
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glViewport(0, 0, (GLint)width, (GLint)height);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glFrustum( -2.0, 2.0, -2.0, 2.0, 6.0, 20.0 );
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glTranslatef( 0.0, 0.0, -8.0 );
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}
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static void init( void )
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{
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#define CUBE_TEX_SIZE 64
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GLubyte image[CUBE_TEX_SIZE][CUBE_TEX_SIZE][3];
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static const GLubyte colors[6][3] = {
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{ 255, 0, 0 },
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{ 0, 255, 255 },
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{ 0, 255, 0 },
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{ 255, 0, 255 },
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{ 0, 0, 255 },
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{ 255, 255, 0 }
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};
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static const GLenum targets[6] = {
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GL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB,
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GL_TEXTURE_CUBE_MAP_NEGATIVE_X_ARB,
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GL_TEXTURE_CUBE_MAP_POSITIVE_Y_ARB,
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GL_TEXTURE_CUBE_MAP_NEGATIVE_Y_ARB,
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GL_TEXTURE_CUBE_MAP_POSITIVE_Z_ARB,
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GL_TEXTURE_CUBE_MAP_NEGATIVE_Z_ARB
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};
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GLint i, j, f;
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/* check for extension */
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{
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char *exten = (char *) glGetString(GL_EXTENSIONS);
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if (!strstr(exten, "GL_ARB_texture_cube_map")) {
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printf("Sorry, this demo requires GL_ARB_texture_cube_map\n");
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exit(0);
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}
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}
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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/* make colored checkerboard cube faces */
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for (f = 0; f < 6; f++) {
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for (i = 0; i < CUBE_TEX_SIZE; i++) {
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for (j = 0; j < CUBE_TEX_SIZE; j++) {
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if ((i/4 + j/4) & 1) {
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image[i][j][0] = colors[f][0];
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image[i][j][1] = colors[f][1];
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image[i][j][2] = colors[f][2];
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}
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else {
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image[i][j][0] = 255;
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image[i][j][1] = 255;
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image[i][j][2] = 255;
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}
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}
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}
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glTexImage2D(targets[f], 0, GL_RGB, CUBE_TEX_SIZE, CUBE_TEX_SIZE, 0,
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GL_RGB, GL_UNSIGNED_BYTE, image);
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}
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#if 1
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glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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#else
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glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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#endif
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glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_CUBE_MAP_ARB, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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glEnable(GL_TEXTURE_CUBE_MAP_ARB);
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glClearColor(.3, .3, .3, 0);
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glColor3f( 1.0, 1.0, 1.0 );
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set_mode(0);
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}
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static void usage(void)
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{
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printf("keys:\n");
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printf(" SPACE - toggle animation\n");
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printf(" CURSOR KEYS - rotation\n");
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printf(" m - toggle texgen reflection mode\n");
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}
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int main( int argc, char *argv[] )
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{
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glutInitWindowPosition(0, 0);
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glutInitWindowSize(300, 300);
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glutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE );
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glutCreateWindow("Texture Cube Maping");
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init();
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glutReshapeFunc( reshape );
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glutKeyboardFunc( key );
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glutSpecialFunc( specialkey );
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glutIdleFunc( idle );
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glutDisplayFunc( draw );
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usage();
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glutMainLoop();
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return 0;
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}
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