475 lines
7.6 KiB
C
475 lines
7.6 KiB
C
/*
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* Copyright (c) 1991, 1992, 1993 Silicon Graphics, Inc.
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*
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* Permission to use, copy, modify, distribute, and sell this software and
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* its documentation for any purpose is hereby granted without fee, provided
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* that (i) the above copyright notices and this permission notice appear in
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* all copies of the software and related documentation, and (ii) the name of
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* Silicon Graphics may not be used in any advertising or
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* publicity relating to the software without the specific, prior written
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* permission of Silicon Graphics.
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*
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* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF
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* ANY KIND,
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* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
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* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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*
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* IN NO EVENT SHALL SILICON GRAPHICS BE LIABLE FOR
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* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
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* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
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* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <math.h>
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#include <stdlib.h>
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#include <GL/glut.h>
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#include "loadppm.c"
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GLenum doubleBuffer;
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char *texFileName = 0;
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PPMImage *image;
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float *minFilter, *magFilter, *sWrapMode, *tWrapMode;
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float decal[] = {GL_DECAL};
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float modulate[] = {GL_MODULATE};
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float repeat[] = {GL_REPEAT};
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float clamp[] = {GL_CLAMP};
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float nr[] = {GL_NEAREST};
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float ln[] = {GL_LINEAR};
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float nr_mipmap_nr[] = {GL_NEAREST_MIPMAP_NEAREST};
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float nr_mipmap_ln[] = {GL_NEAREST_MIPMAP_LINEAR};
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float ln_mipmap_nr[] = {GL_LINEAR_MIPMAP_NEAREST};
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float ln_mipmap_ln[] = {GL_LINEAR_MIPMAP_LINEAR};
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GLint sphereMap[] = {GL_SPHERE_MAP};
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GLenum doSphere = GL_FALSE;
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float xRotation = 0.0, yRotation = 0.0, zTranslate = -3.125;
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GLint cube;
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float c[6][4][3] = {
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{
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{
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1.0, 1.0, -1.0
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},
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{
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-1.0, 1.0, -1.0
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},
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{
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-1.0, -1.0, -1.0
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},
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{
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1.0, -1.0, -1.0
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}
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},
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{
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{
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1.0, 1.0, 1.0
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},
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{
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1.0, 1.0, -1.0
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},
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{
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1.0, -1.0, -1.0
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},
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{
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1.0, -1.0, 1.0
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}
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},
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{
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{
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-1.0, 1.0, 1.0
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},
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{
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1.0, 1.0, 1.0
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},
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{
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1.0, -1.0, 1.0
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},
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{
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-1.0, -1.0, 1.0
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}
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},
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{
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{
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-1.0, 1.0, -1.0
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},
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{
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-1.0, 1.0, 1.0
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},
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{
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-1.0, -1.0, 1.0
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},
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{
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-1.0, -1.0, -1.0
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}
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},
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{
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{
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-1.0, 1.0, 1.0
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},
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{
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-1.0, 1.0, -1.0
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},
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{
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1.0, 1.0, -1.0
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},
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{
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1.0, 1.0, 1.0
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}
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},
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{
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{
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-1.0, -1.0, -1.0
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},
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{
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-1.0, -1.0, 1.0
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},
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{
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1.0, -1.0, 1.0
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},
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{
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1.0, -1.0, -1.0
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}
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}
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};
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static float n[6][3] = {
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{
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0.0, 0.0, -1.0
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},
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{
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1.0, 0.0, 0.0
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},
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{
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0.0, 0.0, 1.0
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},
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{
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-1.0, 0.0, 0.0
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},
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{
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0.0, 1.0, 0.0
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},
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{
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0.0, -1.0, 0.0
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}
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};
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static float t[6][4][2] = {
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{
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{
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1.1, 1.1
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},
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{
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-0.1, 1.1
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},
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{
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-0.1, -0.1
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},
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{
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1.1, -0.1
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}
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},
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{
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{
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1.1, 1.1
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},
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{
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-0.1, 1.1
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},
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{
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-0.1, -0.1
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},
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{
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1.1, -0.1
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}
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},
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{
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{
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-0.1, 1.1
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},
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{
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1.1, 1.1
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},
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{
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1.1, -0.1
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},
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{
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-0.1, -0.1
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}
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},
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{
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{
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1.1, 1.1
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},
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{
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-0.1, 1.1
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},
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{
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-0.1, -0.1
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},
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{
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1.1, -0.1
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}
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},
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{
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{
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1.1, 1.1
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},
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{
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-0.1, 1.1
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},
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{
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-0.1, -0.1
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},
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{
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1.1, -0.1
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}
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},
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{
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{
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1.1, 1.1
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},
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{
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-0.1, 1.1
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},
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{
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-0.1, -0.1
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},
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{
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1.1, -0.1
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}
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},
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};
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static void BuildCube(void)
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{
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GLint i;
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glNewList(cube, GL_COMPILE);
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for (i = 0; i < 6; i++) {
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glBegin(GL_POLYGON);
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glNormal3fv(n[i]); glTexCoord2fv(t[i][0]); glVertex3fv(c[i][0]);
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glNormal3fv(n[i]); glTexCoord2fv(t[i][1]); glVertex3fv(c[i][1]);
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glNormal3fv(n[i]); glTexCoord2fv(t[i][2]); glVertex3fv(c[i][2]);
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glNormal3fv(n[i]); glTexCoord2fv(t[i][3]); glVertex3fv(c[i][3]);
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glEnd();
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}
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glEndList();
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}
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static void BuildLists(void)
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{
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cube = glGenLists(1);
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BuildCube();
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}
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static void Init(void)
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{
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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gluBuild2DMipmaps(GL_TEXTURE_2D, 3, image->sizeX, image->sizeY,
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GL_RGB, GL_UNSIGNED_BYTE, image->data);
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glTexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, decal);
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glEnable(GL_TEXTURE_2D);
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glFrontFace(GL_CCW);
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glCullFace(GL_FRONT);
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glEnable(GL_CULL_FACE);
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BuildLists();
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glClearColor(0.0, 0.0, 0.0, 0.0);
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magFilter = nr;
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minFilter = nr;
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sWrapMode = repeat;
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tWrapMode = repeat;
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}
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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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gluPerspective(145.0, 1.0, 0.01, 1000);
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glMatrixMode(GL_MODELVIEW);
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}
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static void Key2(int key, int x, int y)
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{
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switch (key) {
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case GLUT_KEY_LEFT:
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yRotation -= 0.5;
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break;
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case GLUT_KEY_RIGHT:
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yRotation += 0.5;
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break;
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case GLUT_KEY_UP:
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xRotation -= 0.5;
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break;
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case GLUT_KEY_DOWN:
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xRotation += 0.5;
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break;
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default:
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return;
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}
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glutPostRedisplay();
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}
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static void Key(unsigned char key, int x, int y)
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{
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switch (key) {
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case 27:
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exit(1);
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case 'T':
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zTranslate += 0.25;
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break;
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case 't':
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zTranslate -= 0.25;
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break;
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case 's':
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doSphere = !doSphere;
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if (doSphere) {
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glTexGeniv(GL_S, GL_TEXTURE_GEN_MODE, sphereMap);
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glTexGeniv(GL_T, GL_TEXTURE_GEN_MODE, sphereMap);
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glEnable(GL_TEXTURE_GEN_S);
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glEnable(GL_TEXTURE_GEN_T);
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} else {
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glDisable(GL_TEXTURE_GEN_S);
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glDisable(GL_TEXTURE_GEN_T);
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}
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break;
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case '0':
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magFilter = nr;
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break;
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case '1':
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magFilter = ln;
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break;
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case '2':
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minFilter = nr;
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break;
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case '3':
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minFilter = ln;
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break;
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case '4':
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minFilter = nr_mipmap_nr;
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break;
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case '5':
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minFilter = nr_mipmap_ln;
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break;
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case '6':
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minFilter = ln_mipmap_nr;
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break;
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case '7':
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minFilter = ln_mipmap_ln;
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break;
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default:
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return;
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}
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glutPostRedisplay();
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}
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static void Draw(void)
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{
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glClear(GL_COLOR_BUFFER_BIT);
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glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, sWrapMode);
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glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, tWrapMode);
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glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, magFilter);
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glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, minFilter);
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glPushMatrix();
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glTranslatef(0.0, 0.0, zTranslate);
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glRotatef(xRotation, 1, 0, 0);
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glRotatef(yRotation, 0, 1, 0);
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glCallList(cube);
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glPopMatrix();
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glFlush();
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if (doubleBuffer) {
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glutSwapBuffers();
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}
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}
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static GLenum Args(int argc, char **argv)
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{
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GLint i;
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doubleBuffer = GL_FALSE;
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for (i = 1; i < argc; i++) {
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if (strcmp(argv[i], "-sb") == 0) {
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doubleBuffer = GL_FALSE;
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} else if (strcmp(argv[i], "-db") == 0) {
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doubleBuffer = GL_TRUE;
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} else if (strcmp(argv[i], "-f") == 0) {
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if (i+1 >= argc || argv[i+1][0] == '-') {
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printf("-f (No file name).\n");
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return GL_FALSE;
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} else {
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texFileName = argv[++i];
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}
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} else {
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printf("%s (Bad option).\n", argv[i]);
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return GL_FALSE;
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}
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}
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return GL_TRUE;
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}
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int main(int argc, char **argv)
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{
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GLenum type;
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glutInit(&argc, argv);
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if (Args(argc, argv) == GL_FALSE) {
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exit(1);
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}
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if (texFileName == 0) {
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printf("No image file.\n");
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exit(1);
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}
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image = LoadPPM(texFileName);
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glutInitWindowPosition(0, 0); glutInitWindowSize( 300, 300);
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type = GLUT_RGB;
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type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
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glutInitDisplayMode(type);
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if (glutCreateWindow("Texture Test") == GL_FALSE) {
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exit(1);
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}
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Init();
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glutReshapeFunc(Reshape);
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glutKeyboardFunc(Key);
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glutSpecialFunc(Key2);
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glutDisplayFunc(Draw);
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glutMainLoop();
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return 0;
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}
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